Dumb Question Thread - no flaming or sarcasm allowed
#4276
Thanks
#4277
I finally joined the 21st century and got an ipod touch and an ipad. Any recommendations on an app and/or OBDII wi/fi dongle that will allow me to read ECU parameters in real time, or preferably, do data logging?
I'm particularly interesting in getting lambda/AFRs readings. Are these possible to read in any apps? My Ultra Gauge is the very first generation and isn't capable of giving lambda/AFR's.
I'm particularly interesting in getting lambda/AFRs readings. Are these possible to read in any apps? My Ultra Gauge is the very first generation and isn't capable of giving lambda/AFR's.
#4278
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Remember that even a perfectly healthy rotary is injecting some oil...
#4281
Senior Member
Sorry, I didn't see this before.
If you hold the gas pedal to the floor while cranking, it will cut all fuel. It's for the factory built in deflooding. However, we are only interested in your RPM number from the ultragauge, we don't want the engine to fire. So cutting fuel is an easy way to let it crank without starting and without flooding.
There is a high pressure zone of air at the base of the windshield for any car in motion. How much high pressure depends on the car's speed and the exact shape of the car from the center of the roof forward. The pickup point for that intake is behind the hood, in the cowl. So if you look at your 8, the cowl where the windshield wipers are, those Grand Am RX-8s had a big cut out in that section. So you can see where it is all behind the hood, the hood doesn't close over the opening. So this means that the air box the airfilter is in is exposed to the high pressure air at the base of the windshield.
This also means that the only hot air that the intake sees is saturated heat from the engine, but even then probably only in the slower corners. Those cars spent most of their time over 90mph, and with the 20b sucking down air in huge quantities in a very short run from the filter to the intake ports of the engine, I don't expect that there is much time for the air to actually pick up much of the engine heat.
This is all something you CAN take advantage of with an RX-8, but it would mean a complete ECU replacement that would allow you to replace the entire RX-8 intake manifold from the air box/filter through the upper intake manifold, and then you would have to design your own upper intake manifold to get air from an air box there through a custom throttle body and into the different intake valving runners properly. Even then, you would probably still be down on power until you got your car on the dyno for a long time to figure out where the intake valving open/shut points now need to be, since they are currently tuned for the length of the stock intake and the dimensions of the stock intake manifold. Or you could delete the valving entirely, which would hurt lower RPM even more than the shorter intake already does. However, if you were going for absolute peak power.... it would work.
If I had a money-no-object build to get as much N/A power out of the Renesis as I could, this is one of the strategies I would leverage.
If you hold the gas pedal to the floor while cranking, it will cut all fuel. It's for the factory built in deflooding. However, we are only interested in your RPM number from the ultragauge, we don't want the engine to fire. So cutting fuel is an easy way to let it crank without starting and without flooding.
There is a high pressure zone of air at the base of the windshield for any car in motion. How much high pressure depends on the car's speed and the exact shape of the car from the center of the roof forward. The pickup point for that intake is behind the hood, in the cowl. So if you look at your 8, the cowl where the windshield wipers are, those Grand Am RX-8s had a big cut out in that section. So you can see where it is all behind the hood, the hood doesn't close over the opening. So this means that the air box the airfilter is in is exposed to the high pressure air at the base of the windshield.
This also means that the only hot air that the intake sees is saturated heat from the engine, but even then probably only in the slower corners. Those cars spent most of their time over 90mph, and with the 20b sucking down air in huge quantities in a very short run from the filter to the intake ports of the engine, I don't expect that there is much time for the air to actually pick up much of the engine heat.
This is all something you CAN take advantage of with an RX-8, but it would mean a complete ECU replacement that would allow you to replace the entire RX-8 intake manifold from the air box/filter through the upper intake manifold, and then you would have to design your own upper intake manifold to get air from an air box there through a custom throttle body and into the different intake valving runners properly. Even then, you would probably still be down on power until you got your car on the dyno for a long time to figure out where the intake valving open/shut points now need to be, since they are currently tuned for the length of the stock intake and the dimensions of the stock intake manifold. Or you could delete the valving entirely, which would hurt lower RPM even more than the shorter intake already does. However, if you were going for absolute peak power.... it would work.
If I had a money-no-object build to get as much N/A power out of the Renesis as I could, this is one of the strategies I would leverage.
Had something like that that used the high pressure zone on the Turbo Mini hatch when I had one. Make such a sexy sound too! It pulled from either that location or the front location based on whatever had the most pressure/flow/magic......
I wish DOS didn't go out of business, I would try that intake out or just get the housing. 3D printer it is......
#4282
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Hello everybody, I have a question regarding Cobb access port. I have Cobb access port which is married to another vehicle. I do have the ECU to which it is married to. My question is, if I were to plug in the married ECU into my rx8 would it be enough for me to connect the Cobb and unmary it from the ECU?
#4283
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Hmm, interesting question. Presumably, yes. All the other electronics in the car are looking for the ECU you have in right now, so you won't be able to do much with the other one, but if it powers up the ECU far enough to get past the immobilizer then you should have OBD2 access to the ECU to unmarry.
I am just speculating, take it with a grain of salt.
I am just speculating, take it with a grain of salt.
#4285
OddBall_8
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Just wanted to post here for what I seem to be going though.
So this goes back to seven stock back in November.
Back here in northern California it had started to pour rain everywhere and I started to have lean code p0171. I did make it all the way down to southern California and had stopped received the code and afr was not switching from rich to lean slowly. Back the however torque said sensor 1 and or 2 was out of calibration.
All was well again till today when I drove my car hard and had received it yet again.
Now I wonder if my car had o2 sensor issues even though they have only maybe 2k miles on them with midpipe and catback.
Of course I have not had the o2 sensors checked by professional.
2004 RX8 92k miles
engine 12k
o2 2k
Now for my actual question?
Could it be my o2 sensors that have fouled up and stated to miss read in some way or could my ESS sensor or maf cause it maybe. just want the second opinion?
So this goes back to seven stock back in November.
Back here in northern California it had started to pour rain everywhere and I started to have lean code p0171. I did make it all the way down to southern California and had stopped received the code and afr was not switching from rich to lean slowly. Back the however torque said sensor 1 and or 2 was out of calibration.
All was well again till today when I drove my car hard and had received it yet again.
Now I wonder if my car had o2 sensor issues even though they have only maybe 2k miles on them with midpipe and catback.
Of course I have not had the o2 sensors checked by professional.
2004 RX8 92k miles
engine 12k
o2 2k
Now for my actual question?
Could it be my o2 sensors that have fouled up and stated to miss read in some way or could my ESS sensor or maf cause it maybe. just want the second opinion?
#4286
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2,000 miles on the sensors indicates you recently replaced them. Are you sure you bought the right ones? Many online shops and parts stores have it wrong.
Posted From RX8Club.com Android App
Posted From RX8Club.com Android App
#4289
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Ok, yup, Mazmart wouldn't have sold you the wrong ones.
The first thing i'd do, since it's cheap and easy, is get a can of MAF cleaner and clean the MAF. Then reset the fuel trims (disconnect negative battery cable for a few minutes), then start up the engine and let it idle warm, then idle for another 5-10 minutes.
P0171 is System too Lean
If that doesn't solve it, then I'd test for vacuum leaks. Note 'TEST' not 'just look'. Many vacuum leaks are diabolically hard to find.
The first thing i'd do, since it's cheap and easy, is get a can of MAF cleaner and clean the MAF. Then reset the fuel trims (disconnect negative battery cable for a few minutes), then start up the engine and let it idle warm, then idle for another 5-10 minutes.
P0171 is System too Lean
System too lean
The PCM monitors the short term fuel trim (SHRTFT) and long term fuel trim (LONGFT) when under closed loop fuel control. If the fuel trim is more than the specification, the PCM determines that the system is too lean.
Mazda's Causes
Front HO2S malfunction
Excess air suction in intake-air system
Leakage exhaust gas
MAF sensor malfunction
Fuel line pressure malfunction
Fuel pump unit malfunction
Leakage fuel
Ignition system malfunction
Insufficient compression
Fuel injector malfunction
PCM malfunction
The PCM monitors the short term fuel trim (SHRTFT) and long term fuel trim (LONGFT) when under closed loop fuel control. If the fuel trim is more than the specification, the PCM determines that the system is too lean.
Mazda's Causes
Front HO2S malfunction
Excess air suction in intake-air system
Leakage exhaust gas
MAF sensor malfunction
Fuel line pressure malfunction
Fuel pump unit malfunction
Leakage fuel
Ignition system malfunction
Insufficient compression
Fuel injector malfunction
PCM malfunction
#4291
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That could definitely be your problem. Leaking air from the seal in front of the MAF at the sensor wouldn't cause a vacuum leak but it would mess up the airflow across the MAF. Leaking air from the seal behind the MAF would be a vacuum leak.
#4293
A few dumb questions if you guys don't mind.
1. I changed my oil a year ago and I've done 1500 miles. Do I have to change my oil now, or can I wait until I've done 3000 miles?
2. I live in a really hot climate (90F ambient temp) and it never gets cold, and Mazda's FL-22 Coolant isn't available. Can I buy some green coolant and run a really low coolant to water mix? Something like 15% coolant and 85% distilled water? To keep my temps lower?
3. About 6 months ago, the rubber grommet under the air intake box fell in and jammed the fan under the coolant reservoir. Although it spins fine, is it possible it slightly burned the fan motor, making it spin slower?
4. IF that is possible, can I replace the fan motor with a fan motor from a different car? Something much more powerful? Say from a big V6 or V8, to keep the temps low?
Thanks a lot
1. I changed my oil a year ago and I've done 1500 miles. Do I have to change my oil now, or can I wait until I've done 3000 miles?
2. I live in a really hot climate (90F ambient temp) and it never gets cold, and Mazda's FL-22 Coolant isn't available. Can I buy some green coolant and run a really low coolant to water mix? Something like 15% coolant and 85% distilled water? To keep my temps lower?
3. About 6 months ago, the rubber grommet under the air intake box fell in and jammed the fan under the coolant reservoir. Although it spins fine, is it possible it slightly burned the fan motor, making it spin slower?
4. IF that is possible, can I replace the fan motor with a fan motor from a different car? Something much more powerful? Say from a big V6 or V8, to keep the temps low?
Thanks a lot
#4294
Too old for PC
*Personally I would change the oil asap. Despite the low mileage, sitting that long can allow certain acidic actions to take place. Depending on the type of oil, I think contaminates can adversely affect the additives and viscosity modifiers too. Oil changes aren't expensive.
*Check the labels on other coolants. Not sure, but I think others produce the FL-22 stuff. And I would go no lower than 15% (~7:1 ratio). You need some for lubrication and corrosion protection. Regardless, be sure to use distilled water.
*If you haven't already, I'd start and let the car idle while I visually monitor the fan. If it comes on line, spins up quickly and freely, and without any unusual noises, it's probably fine. My thinking is that the fan speed is matched to the blade size and pitch for optimum performance. Sticking in a bigger motor wouldn't do much and may have consequences with too much current draw.
Edit:
A quick search looks like these are also FL-22 (no silicates) but it's google so confirm yourself:
*Motorcraft Specialty Green
*Zerex Asian
*And it looks like AMAZON has some of the MAZDA stuff... http://www.amazon.com/dp/B00BNVJZPQ/...sl_sv1tdtri1_e
*Check the labels on other coolants. Not sure, but I think others produce the FL-22 stuff. And I would go no lower than 15% (~7:1 ratio). You need some for lubrication and corrosion protection. Regardless, be sure to use distilled water.
*If you haven't already, I'd start and let the car idle while I visually monitor the fan. If it comes on line, spins up quickly and freely, and without any unusual noises, it's probably fine. My thinking is that the fan speed is matched to the blade size and pitch for optimum performance. Sticking in a bigger motor wouldn't do much and may have consequences with too much current draw.
Edit:
A quick search looks like these are also FL-22 (no silicates) but it's google so confirm yourself:
*Motorcraft Specialty Green
*Zerex Asian
*And it looks like AMAZON has some of the MAZDA stuff... http://www.amazon.com/dp/B00BNVJZPQ/...sl_sv1tdtri1_e
Last edited by Signal 2; 01-12-2015 at 07:06 AM. Reason: add info
#4295
40th anniversary Edition
stick with fl-22 it is critical to work with the mix of metals in your engine and cooling system. Other coolants can cause permanent damage to your cooling system and give less protection in cold and hot climates. Don't try to out-think the Mazda engineers here.
#4296
*Personally I would change the oil asap. Despite the low mileage, sitting that long can allow certain acidic actions to take place. Depending on the type of oil, I think contaminates can adversely affect the additives and viscosity modifiers too. Oil changes aren't expensive.
*Check the labels on other coolants. Not sure, but I think others produce the FL-22 stuff. And I would go no lower than 15% (~7:1 ratio). You need some for lubrication and corrosion protection. Regardless, be sure to use distilled water.
*If you haven't already, I'd start and let the car idle while I visually monitor the fan. If it comes on line, spins up quickly and freely, and without any unusual noises, it's probably fine. My thinking is that the fan speed is matched to the blade size and pitch for optimum performance. Sticking in a bigger motor wouldn't do much and may have consequences with too much current draw.
Edit:
A quick search looks like these are also FL-22 (no silicates) but it's google so confirm yourself:
*Motorcraft Specialty Green
*Zerex Asian
*And it looks like AMAZON has some of the MAZDA stuff... http://www.amazon.com/dp/B00BNVJZPQ/...sl_sv1tdtri1_e
*Check the labels on other coolants. Not sure, but I think others produce the FL-22 stuff. And I would go no lower than 15% (~7:1 ratio). You need some for lubrication and corrosion protection. Regardless, be sure to use distilled water.
*If you haven't already, I'd start and let the car idle while I visually monitor the fan. If it comes on line, spins up quickly and freely, and without any unusual noises, it's probably fine. My thinking is that the fan speed is matched to the blade size and pitch for optimum performance. Sticking in a bigger motor wouldn't do much and may have consequences with too much current draw.
Edit:
A quick search looks like these are also FL-22 (no silicates) but it's google so confirm yourself:
*Motorcraft Specialty Green
*Zerex Asian
*And it looks like AMAZON has some of the MAZDA stuff... http://www.amazon.com/dp/B00BNVJZPQ/...sl_sv1tdtri1_e
OK. I'll go with a 15% mix. The coolant available at my local parts store is Caltex Havoline XLI. It says on the back that it contains 2-Ethylhexanoate salt. Is that bad for our cars?
Problem is, I can't buy stuff off Amazon.
Thanks a lot for your help
Thanks.
#4297
Thanks for the reply Ok so I should change the oil. But it's still gold in color. It hasn't turned dark yet. Should I change the filter as well?
OK. I'll go with a 15% mix. The coolant available at my local parts store is Caltex Havoline XLI. It says on the back that it contains 2-Ethylhexanoate salt. Is that bad for our cars?
Problem is, I can't buy stuff off Amazon.
Thanks a lot for your help
Thanks for the reply Yes, I know that FL-22 is the ideal coolant for our cars. But what can I do when even the Mazda agents don't have it They use Caltex XLI coolant. This is why I'm looking for alternatives.
Thanks.
OK. I'll go with a 15% mix. The coolant available at my local parts store is Caltex Havoline XLI. It says on the back that it contains 2-Ethylhexanoate salt. Is that bad for our cars?
Problem is, I can't buy stuff off Amazon.
Thanks a lot for your help
Thanks for the reply Yes, I know that FL-22 is the ideal coolant for our cars. But what can I do when even the Mazda agents don't have it They use Caltex XLI coolant. This is why I'm looking for alternatives.
Thanks.
I have had good luck with a product called "Beck/Arnley 50/50. you can check it out at www.Beckfluids.com.
I have used it a long time and i have just over 93000 miles and no ill effects.Never had a cooling issue with it.
#4298
Wankler
Oil change intervals, sohn, catch can, correct coolant
Thanks for the reply Ok so I should change the oil. But it's still gold in color. It hasn't turned dark yet. Should I change the filter as well?
OK. I'll go with a 15% mix. The coolant available at my local parts store is Caltex Havoline XLI. It says on the back that it contains 2-Ethylhexanoate salt. Is that bad for our cars?
Problem is, I can't buy stuff off Amazon.
Thanks a lot for your help
Thanks for the reply Yes, I know that FL-22 is the ideal coolant for our cars. But what can I do when even the Mazda agents don't have it They use Caltex XLI coolant. This is why I'm looking for alternatives.
Thanks.
OK. I'll go with a 15% mix. The coolant available at my local parts store is Caltex Havoline XLI. It says on the back that it contains 2-Ethylhexanoate salt. Is that bad for our cars?
Problem is, I can't buy stuff off Amazon.
Thanks a lot for your help
Thanks for the reply Yes, I know that FL-22 is the ideal coolant for our cars. But what can I do when even the Mazda agents don't have it They use Caltex XLI coolant. This is why I'm looking for alternatives.
Thanks.
The color of the oil does not indicate effectiveness, the oil gets dark due to blow by, etc. Good color does not mean the agents in the oil haven't broken down and, remember, half the oil in the engine is already really old. Good oil and filtration are two of the main factors in keeping your engine from self destructing and it's a relatively inexpensive insurance. I change my oil and filter every 3,000 miles or three months whichever comes first. Although some may go longer, I'd rather be safe than sorry especially considering the price.
If you plan to keep your 8 for awhile consider getting a SOHN. Your 8 injects oil onto the rotors to lubricate the seals, and burns that oil. The SOHN allows you to burn 2-stroke (premix) oil that is formulated to burn and will reduce the possibility of a carbon choked engine. Install: https://www.rx8club.com/series-i-tec...w-pics-252069/ https://www.rx8club.com/series-i-do-...dapter-233841/ Purchase: OMP Adapters - Rotary Aviation<br />.com
Also, for an inexpensive way to keep engine oil overflow out of your fresh air intake, and to help keep blow by from gumming up your valves, especially your SSV, and throttle, I suggest you get a catch can. How works: Catch Can FAQ - NASIOC Oil Catch Cans | Everything you need to know and more! INSTALL & PARTS: https://www.rx8club.com/series-i-do-...-basic-164463/ Alternatives: https://www.rx8club.com/series-i-tec...ch-can-137882/ I use a catch can that vents to the atmosphere to keep the oily blow by from gumming up my intake, throttle body, and valves.
On coolant, 15% coolant to 85% DISTILLED water may work well, but I don't have experience or know of anyone going that low in coolant. Friends who race their 8s use 25-30% coolant to 75-70% distilled water. I have heard several people just use a couple or so bottles of WaterWetter® and distilled water, without any coolant at all, but I'm not sure I'm ready to depend on WaterWetter® that much even though Red Line says it "...provides corrosion and rust protection for modern aluminum and cast iron cooling systems." (Google the reviews if you're interested.) Make sure you change coolant per manufacturer requirements, if not earlier.
On the coolant to use, I recommend you AVOID any coolant with 2-ethylhexanoate known, also, as 2-EHA. Caltex Havoline XLI that contains 2-Ethylhexanoate salt is BAD for our cars.
Although a great many coolants such as Caltex Havoline, Prestone, DEX-COOL® and many others use 2-EHA, it is NOT for our 8s because it breaks down plastic in the cooling system and breaks down silicone seals in our engines leading to leaks of coolant into the engine that could cause catastrophic failure.
If you have access to Ford products, I believe Ford Motorcraft Specialty Green Engine Coolant [part VC-10-A2, or VC-10-A (premixed)] is free of 2-EHA. Whatever you chose make sure you have NO 2-ethylhexanoate (2-EHA). See, https://www.rx8club.com/series-i-tec...licone-238638/
Hope all this helps.
Last edited by Rx8 Dave; 01-12-2015 at 10:00 PM.
#4300
Too old for PC
http://www.napaonline.com/Catalog/Re...Dp%3d3%26N%3d0
Antifreeze/Coolant Zerex 675130 - Engine Coolant/Anti-Freeze | O'Reilly Auto Parts
Looks like WalMart also carries it. Do you have a NAPA, O'Reilly's or Walmart near you?
Antifreeze/Coolant Zerex 675130 - Engine Coolant/Anti-Freeze | O'Reilly Auto Parts
Looks like WalMart also carries it. Do you have a NAPA, O'Reilly's or Walmart near you?