Too much boost causing REP?
Thread Starter
Burning Brakes
Joined: Dec 2008
Posts: 818
Likes: 444
From: Maumelle, AR
Too much boost causing REP?
When I rev above 6200ish and let off the throttle the car will go into reduced engine power and hold about 2500 rpm until I delete the codes. It doesn't do it every time but I'd say it's about a third of the time. In my mind what's happening is that when I let off the throttle it's telling the throttle body blade to close but the boost isn't letting it until it bleeds enough off so it's going into rep because the pedal and tb don't agree. I've got a big red race valve and it's as open as it'll go. I'm running an LS2 90mm throttle body. Anybody got any ideas?
Thanks,
Alex
Update: The code was p1515 (command vs actual throttle position error). We swapped throttle bodies and that fixed it.
Thanks,
Alex
Update: The code was p1515 (command vs actual throttle position error). We swapped throttle bodies and that fixed it.
Last edited by Prop Job; Sep 20, 2011 at 08:33 AM.
Melting Slicks
Joined: Nov 2007
Posts: 2,144
Likes: 2
From: Conway AR
I am sure it's something simple. Kris will be back off vacation next week and be able to check it out. Mine used to do it when LMR didn't scale injectors back and would max out grams per cylinder. I saw your tune and it's not that.
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
Thread Starter
Burning Brakes
Joined: Dec 2008
Posts: 818
Likes: 444
From: Maumelle, AR
no tire spin. hopefully I'll have a chance to run it to Kris mon morning before it hit the road to get those codes turned back on.
I just got done doing some "troubleshooting" and it seems to be more dependent on what rpm it is when I roll into it. If I try the initial hit above 4k it seems to happen 100% of the time. that may not be the exact rpm but it's somewhere around there.
I just got done doing some "troubleshooting" and it seems to be more dependent on what rpm it is when I roll into it. If I try the initial hit above 4k it seems to happen 100% of the time. that may not be the exact rpm but it's somewhere around there.
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Drifting
Joined: Aug 2006
Posts: 1,629
Likes: 6
From: Little Rock Arkansas
I returned from vacation and turned the ETC codes back on. I didn't want to turn them off but to satisfy Alex I did so anyway. No way to know whats causing problems if the codes are off. The car was throwing a P1515 code. Commanded and actual TP are not within calibrated range. I replaced the TB and problem went away. I think the car now has every bug worked out. Time to enjoy the car Alex!
Hope you enjoyed your vacation! (much neeed I'm sure).