Cobb AcessPORT with TURBO Discussion
04-01-2008, 10:45 AM
#77
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I noticed that nobody is complaining about rich misfires at afr's at 10. I wonder if I'm the only one with the misfires and if my coils are weaker than everyone elses. I only have the misfires under really rich conditions.
04-01-2008, 11:26 AM
#79
04-01-2008, 07:39 PM
#82
I think the 380/380/720 setup will be the most common.
04-01-2008, 08:37 PM
#85
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The point was to install an injector setup that would provide plenty of headroom to max out the Greddy and for future turbo upgrades as well.
BTW, it's easy to make a engine with 650cc primary's cruise, idle or drive at whatever AFR's you like! If the EMS has control of the injectors and the person tuning knows what their doing, no problem.
Scott
04-01-2008, 09:42 PM
#86
bi polar rotor loner
No, not even close.
The point was to install an injector setup that would provide plenty of headroom to max out the Greddy and for future turbo upgrades as well.
BTW, it's easy to make a engine with 650cc primary's cruise, idle or drive at whatever AFR's you like! If the EMS has control of the injectors and the person tuning knows what their doing, no problem.
Scott
The point was to install an injector setup that would provide plenty of headroom to max out the Greddy and for future turbo upgrades as well.
BTW, it's easy to make a engine with 650cc primary's cruise, idle or drive at whatever AFR's you like! If the EMS has control of the injectors and the person tuning knows what their doing, no problem.
Scott
04-02-2008, 02:23 AM
#87
Optimally, you want the smallest injectors in the primary position.
After that, you can pretty much do what you want, but going up from smallest to largest in staging order is best.
Remember, with 650cc injectors at idle, you are going from a 4ms pulse to a 1.7ms pulse and this is barely more than the injector's latency!
The OE PCM has a very fine injector timing gradient, but when a hundredth of a millisecond of injector timing at idle is equal to over a point of lambda, you are really asking for a lot when you want 650cc injectors to be your primaries.
Since the acceptable target lambda at idle with the INT-X seems to be anywhere from 1.0 to .75 (!), saying that its "easy to make a engine with 650cc primary's cruise, idle or drive at whatever AFR's you like!" is pretty disingenuous.
Apparently "whatever AFR's you like" really means whatever AFRs the Int-X likes.
After that, you can pretty much do what you want, but going up from smallest to largest in staging order is best.
Remember, with 650cc injectors at idle, you are going from a 4ms pulse to a 1.7ms pulse and this is barely more than the injector's latency!
The OE PCM has a very fine injector timing gradient, but when a hundredth of a millisecond of injector timing at idle is equal to over a point of lambda, you are really asking for a lot when you want 650cc injectors to be your primaries.
Since the acceptable target lambda at idle with the INT-X seems to be anywhere from 1.0 to .75 (!), saying that its "easy to make a engine with 650cc primary's cruise, idle or drive at whatever AFR's you like!" is pretty disingenuous.
Apparently "whatever AFR's you like" really means whatever AFRs the Int-X likes.
04-02-2008, 05:05 AM
#89
So... I understand very little about all of this, but right now it runs perfect, very smooth, idles smooth, so this would be something the stock ECU is not programmed to deal with then? It's setup to use smaller to larger in other words?
Is there any fix or workaround for this injector setup?
Is there any fix or workaround for this injector setup?
Last edited by m4f1050; 04-02-2008 at 05:10 AM.
04-02-2008, 07:08 AM
#90
So... I understand very little about all of this, but right now it runs perfect, very smooth, idles smooth, so this would be something the stock ECU is not programmed to deal with then? It's setup to use smaller to larger in other words?
Is there any fix or workaround for this injector setup?
Is there any fix or workaround for this injector setup?
04-02-2008, 08:39 AM
#91
is everyone running the rx7 trailings sparkplugs with no washer on the lead and 2 washers on the trailing?
Curious what does a screen post maf do?
The oem pipe is tapered and it is NOT round---yall have noticed that ---right?
remember also now that yall are back on the maf system---system grounds become important and more of a factor than with the standalones.
Hint---the space in the rotor housing between were the lead sparkplug itselfs ends and the actual entry into the housing itself--approx 1/4 inch--CLEAN IT--its a haven for hot spots.
olddragger
Curious what does a screen post maf do?
The oem pipe is tapered and it is NOT round---yall have noticed that ---right?
remember also now that yall are back on the maf system---system grounds become important and more of a factor than with the standalones.
Hint---the space in the rotor housing between were the lead sparkplug itselfs ends and the actual entry into the housing itself--approx 1/4 inch--CLEAN IT--its a haven for hot spots.
olddragger
04-02-2008, 02:10 PM
#93
Remember - I have no idea who anyone is on this forum.
I keep asking for people to include ALL of their relevant info in every e-mail (REAL name, FORUM name, year/model/mods, if you live in Cali, etc.), but it doesn't seem to be happening.
Please, send all relevant info to ap@mazdamaniac otherwise you are yelling at the wind!
04-02-2008, 11:33 PM
#94
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If anyone else is having problems with their stock greddy maf housing, i'm going to do a full DIY about how to fix it with the CAI that mysql used. This might safe Jeff the time of having to try and tune to make up for the not-optimal flow in the greddy maf setup.
https://www.rx8club.com/series-i-major-horsepower-upgrades-93/diy-ultimate-greddy-turbo-cai-ap-owners-142267/
https://www.rx8club.com/series-i-major-horsepower-upgrades-93/diy-ultimate-greddy-turbo-cai-ap-owners-142267/
04-03-2008, 01:21 AM
#96
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https://www.rx8club.com/showpost.php...7&postcount=72
i took out the stock greddy maf housing and am using the stock mazda ABS polymer housing! with two screens. it works a bit better but since this is going to eventually become a bottleneck and also cause tuning complications, i'd rather eliminate this bottleneck now and have optimal smooth airflow
i took out the stock greddy maf housing and am using the stock mazda ABS polymer housing! with two screens. it works a bit better but since this is going to eventually become a bottleneck and also cause tuning complications, i'd rather eliminate this bottleneck now and have optimal smooth airflow
04-03-2008, 01:56 AM
#97
Did you just send me an e-mail about your injector sizes?
Remember - I have no idea who anyone is on this forum.
I keep asking for people to include ALL of their relevant info in every e-mail (REAL name, FORUM name, year/model/mods, if you live in Cali, etc.), but it doesn't seem to be happening.
Please, send all relevant info to ap@mazdamaniac otherwise you are yelling at the wind!
Remember - I have no idea who anyone is on this forum.
I keep asking for people to include ALL of their relevant info in every e-mail (REAL name, FORUM name, year/model/mods, if you live in Cali, etc.), but it doesn't seem to be happening.
Please, send all relevant info to ap@mazdamaniac otherwise you are yelling at the wind!