Cobb Stage 1 Tune Unsafe?
#1
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Cobb Stage 1 Tune Unsafe?
Well I got my hands on a Cobb Accessport 2 days ago. So I "installed" it and loaded the Stage 1 map. Went for a test drive, let the car warm up first ect. Then tried some WOT pulls and observed the AFR. I saw 14's, 15's and even 16's at high RPM.
I thought maybe the sensor was faulty so I loaded the stock style map on. I then drove around for a bit and did the pulls again. Now I observed low 11's which which was what I was expecting.
My car is 100% stock at this moment. Nothing is done to it at all. I would assume the Stage 1 map should be safe if the stock one is fine but it isn't. Any ideas?
Of course, I plan to be tuning this myself and even have the AccessTuner Race but the Stage 1 map being off the charts has made me stop and find out why it isn't working as advertised before I start messing with anything else.
Also, whats with the 66.69% throttle at WOT?
thewird
I thought maybe the sensor was faulty so I loaded the stock style map on. I then drove around for a bit and did the pulls again. Now I observed low 11's which which was what I was expecting.
My car is 100% stock at this moment. Nothing is done to it at all. I would assume the Stage 1 map should be safe if the stock one is fine but it isn't. Any ideas?
Of course, I plan to be tuning this myself and even have the AccessTuner Race but the Stage 1 map being off the charts has made me stop and find out why it isn't working as advertised before I start messing with anything else.
Also, whats with the 66.69% throttle at WOT?
thewird
Last edited by thewird; 01-16-2010 at 04:14 AM.
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Those are weird numbers. I've been running the Cobb tune for a while now, and it always gets rich when I lay onto the throttle. Your first experience might have been your car re-learning the tune after you reflashed the ECU.
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With both maps, the car tries really hard to stay at 14.7 in closed loop except at idle which is 15 but I assume thats the air pump since I don't think its actually idling at 15's. Haven't had time to pull the airpump fuse and testing it.
thewird
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Idling at 15 is normal for that map. As far as I could gather from other threads, 14.7-15 is normal when you are at idle, and it should drop all the way down to 11 when you get to WOT. That is the range it should stay in for the Cobb Stage 1 tune. It should not be detrimental to the engine (besides burning a bit more gas at WOT for being so rich).
#6
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Idling at 15 is normal for that map. As far as I could gather from other threads, 14.7-15 is normal when you are at idle, and it should drop all the way down to 11 when you get to WOT. That is the range it should stay in for the Cobb Stage 1 tune. It should not be detrimental to the engine (besides burning a bit more gas at WOT for being so rich).
theiwrd
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I'm unsure then, as mine idles just fine. I brought it up to attention before, but most people were worried more about the higher load areas. I'd be interested in what you find out then
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#12
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theiwrd
Last edited by thewird; 01-16-2010 at 12:12 PM.
#13
For most RX8's the COBB stage 1 is very lean. I wouldn't suggest anyone use that tune even if you have the modifications listed for it.
#16
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Pretty sure the air pump is what makes the idle 15 AFR. To my knowledge cat's still require air to stay in operating temp at idle :P. If you've tuned rotaries before, the idle starts becoming unstable higher then ~13 AFR. The turbo RX-8 I tuned with the interceptor-X was no exception.
thewird
#17
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nope . It would be way higher if the air pump was on and the engine was warm .
+ you would hear the pump .
15.0 is fine for idle on the Renesis - although it does idle better if it is richer . The int -x was notorious for requiring a very rich idle due to other constraints it has.
Last edited by Brettus; 01-16-2010 at 12:44 PM.
#20
completely different when using MAF vs. MAP
my idle is rock solid at 14.7 AFR on my turbo 8 using the accessport...better than stock
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