DailyDriver2k5

Well here is what my car ran on bad plugs, 95 degree weather with 85 perecent humidity. Also the operator did not turn off the DSC like I asked him too. I love how this motor still makes power well past the 8500 rpm mark, bridge porting works for this motor. Also the operator was scared to take it to 9600 rpm , why the sudden drop off at 9400 rpm. He was worried that my street car was going to blow its motor.

Going to run it on a dyno jet in a month with new plugs and run it in the morning. I know dyno jets read 20% higher than mustang dynos. Even the bone head operator told me I would be at 212-217 to the wheels on that dyno. Im not going to speculate , will see when that time comes.

Carbon8

iTrader: (4)

Good numbers, if your running a 4 port.

DailyDriver2k5

No its a 6 port on a mustang dyno. Remember a mustang dyno reads 20% lower than a dyno jet.

Carbon8

iTrader: (4)

You sure about that, my mustang dyno put me at 230WHP on a stock 6 port.

DailyDriver2k5

Im pretty sure, you sure the operator added resistance to the rollers on your run? 230WHP out of a stock RX-8 is very high. Most cars that go on a mustang dyno, results are way lower than a dynojet test results. If your car is making that number at stock on a Mustang dyno, then Kudos to you. But you will be one of the few and rare cases to achieve such numbers.

Carbon8

iTrader: (4)

I will be the first to agree that mine seems high, and I even doubt its accuracy. I have never dyno'd on a dyno jet. All that aside, stock 6 port with 50 hp more than a bridgeport 6 port on the same type of dyno just doesn't add up in your case.

DailyDriver2k5

Actually it does, stock RX-8 dynoed on a Mustang Dyno only put out 150-160WHP at best. There is always a huge debate over Mustang dyno vs Dyno Jets in the automotive enthusiast world. The "heartbreaker" aka Mustang dyno suppose to give you more real world numbers while a dyno jet will give you numbers to brag to your friends and family about.

My buddy with his 97 Golf turbo , on a Mustang dyno he is pushing out 215 whp, dyno jet he is pushing out 258-262WHP. Thats about 20% difference.

I am not taking anything away from you, if your car puts out that much , then Kudos to you. I'll be visiting the dyno jet at the end of June to see what i get again. I should have never dynoed my car with the DSC on and never should have dynoed it when it was so hot outside. Early morning session next time.

But the real elephant in the room for me wasn't about the numbers, wether a bridgeport Renesis could maintain or make power after 8500 rpm? And it does! So the million dollar question has been finally answered.

Carbon8

iTrader: (4)

Looking forward to the comparison. I will be doing the same thing. I made the mistake of only going to one dyno when I should have done multiple pulls on different dyno's.

Goodluck

wcs

iTrader: (2)

@DD2k5 what gear was that pull performed in?

DailyDriver2k5

Thank you and same to you.

DailyDriver2k5

4th gear.

wcs

iTrader: (2)

You'll get big difference in numbers between a 5th and 4th gear pull.

Carbon's 4th gear pull looks to be 214hp not 230hp

Even a 214hp pull in forth is a rare and exceptional reading for a stock NA engine.

Most are in 180-190's

My 2k5 was 177 stock on a dyno jet

Carbon8

iTrader: (4)

Makes more sense to dyno in 5th 1:1 gear minimal parasitic loss

DailyDriver2k5

Very true WSC , I was told by many to get a 4th gear pull because of the simple fact that its 1:1. The results would be more accurate to what the motor is putting out, not only for our cars but for the majority of cars out there.

177 WHP on a dyno jet is about right for being stock. 170-180 is the target range.

Carbon8

iTrader: (4)

4th gear is not 1:1

Diff - 4.444
1st - 3.760 * 4.444 = 16.7094
2nd - 2.269 * 4.444 = 10.0834
3rd - 1.65* 4.444 = 7.3704
4th - 1.187 * 4.444 = 5.27503
5th - 1.000 * 4.444 = 4.44400
6th - 0.843 * 4.444 = 3.74629

9krpmrx8

iTrader: (46)

The type of dyno is only called into question when the numbers are low,

And as I thought, power still flat lines at 8500RPM. It's still maintaining but not increasing past the 8500RPM. Still pretty pathetic number though, I have seen basically stock 8's make more. But there are so many factors that play into how a dyno is setup you never really know what the numbers mean unless you have a baseline to work off of. It's always good to bring another 8 to dyno with you.

DailyDriver2k5

Oh really? That is why most people who build there cars go to Mustang and dyno jets to get both numbers.

Show me a stock Rx-8 on a mustang dyno then. I can show you many dyno results on Youtube of stock RX-8 not even getting out of the 150's on a mustang dyno. Also if you add 20% to the results i would be putting out 212-217 down theoretically on a dyno jet.

Flat line? Most stock RX-8 or bolt on Rx-8's nose dive after 8500 rpm. There is plenty of power under the curve and the power still goes up even after the operator was letting up off the gas, hence the breaking up at the end. The Bridge ported Renesis makes power!

No excuses here, happy with the results and will go to dyno jet later in June. Last time i checked 179 is higher than 150.

9krpmrx8

iTrader: (46)

So your saying this RX-8 was making 225WHP with just a Revi intake?

DailyDriver2k5

Possibly yes. And i say that because if the resistance wasn't added or not added properly then yes it is possible for that RX-8 to make that kind of power. Look at Carbon's RX-8 , 225whp stock on a mustang dyno? So your telling me Carbons RX-8 is producing 270 WHP stock on a dyno jet???? I tell you what I will personaly fly up to NY and shake Carbons hand if his stock RX-8 is making that kind of power. Maybe his car produced that number maybe it doesn't. What load settings added to the rollers is key to a car making low or high numbers. Am i right or wrong? Hell maybe my load setting could of been set to high, possible yes! All i know this is what my car put down, no more or less.

9krpmrx8

iTrader: (46)

Possibly yes on a stock Renesis with a "CZ tune" and an intake?

You are wrong. And that is exactly my point. Dyno numbers between different types of dynos and even dynos of the same type in different environments with different setup parameters means nothing. So saying Mustang Dynos across the board read 20% lower than other types of dynos is an incorrect statement. Every dyno is different so unless you have numbers from another RX-8 on this dyno from the same day then we have to assume the numbers you put down are accurate.

DailyDriver2k5

Dude a dyno is a tool, it has to be calibrated , right or wrong calibration can give people higher or lower numbers. Hence why people get two dyno reading from the Mustang dyno and a dyno jet. The norm from dyno jets to mustang dyno reading is targeted at 20% diference. Did i make up this rule, no, but is that what most of the masses are putting down between the two, yes.

Same reason why the '94 Integra LS with I/H/E who went infront of me dyno'd 400 WTRQ /290WHP on the mustang dyno. Reason why? No load was put on the dual rollers. Once calibrated his car put out 121 WHP and 105 WTRQ.

Dynos are a tool and have to be calibrated properly. That RX-8 with a Revi might of spit out 188WHP. Is it the norm, no.Did it happen yes. Was the dyno calibrated properly, maybe yes , maybe no. "Most" stock RX-8's on dyno's that I have seen in the real world are putting out 150-160 on a Mustang dyno. "Most" stock Rx-8 on a dyno jet are putting out 170-180 whp.Not saying there could be a factory freak that could put out 188 by itself with no mods on the mustang dyno,but I have yet to see one.

9krpmrx8

iTrader: (46)

Yes.......I understand that dude, as I stated already. But yet you think you think your numbers are accurate? Based on what? How do you know this dyno is calibrated right? And the 20% mustang/dynojet number you speak of is made up by whom? I have been in the game a long time and have dynoed cars on both Mustangs and Dynojets and seen unusually low numbers on both. I agree most Mustang dynos seem to read low but to say there is an across the board accepted 20% difference is just silly.

WTBRotary!

iTrader: (6)

Dyno on both a Mustang and a DynoJet, average the numbers and call it a day...

DailyDriver2k5

Believe me 9k this isn't my first pony show either. Been tuning cars since 1994 and have been dynoing cars from my lowly civic to my monster twin turbo Z and every muscle and tuner car I owned in between. 20% is not a made up number , but it happens to be a average among many people who dyno on both systems from coast to coast. And your right who knows if the mustang dyno I used was calibrated correctly or incorrectly. Hence why I am going to a dyno jet at the end of June. I never been one to put faith in just one dyno reading. I didn't do it back then I am not planning on starting now.

RadRedR3

Everytime I get to a dyno thread that starts with a laundry list of excuses...

...ran on bad plugs,
...95 degree weather
...with 85 perecent humidity.
...operator did not turn off the DSC
...my breasts were tender and I was cramping

I know the thread is gonna be a good one. Seriously, just don't. Run your car and take the results. It is what it is. If something needs fixed to make power, fix it first.

Sorry just a pet peeve of mine. Post up and shut up. If there's an excuse, errr, reason you have to justify what you put down. Don't post it.

Oh, and I have to agree with 9k on the "every mustang is 20% less than a dyno jet". Just like the "every automatic is 18% drivetrain loss... Or insert whatever % makes the number they want". That's all just a guess. If you want to guess, feel free. But if you (and by "you" I'm speaking in general terms) want to guess and try to pass it off to people who know better, expect to be called on it.

My two cents worth...YMMV.