stock srt-4 overboosting on 93perf tune.

derr12 · Post by **derr12** » Tue Apr 14, 2009 5:02 pm

I have an intake and the mopar rice plate (noisemaker), and an oil catch can.
other than that, im bone stock. running 94 octane chevron fuel.

before winter i loaded the 93 octane tune with limited success, had a little knock up top, but other than that....

this spring i loaded the stock tune so i could update firmware on the dsport.

re-loaded the 93 tune. and now i spike to 20 psi in second, more in 3rd gear. i let off right away cuz that's too much boost.

half a tank of gas and the pcm still hasnt "learned" so i pulled the neg terminal for a half hour. Same thing.

only difference from before winter was the firmware.

any ideas?

derr12 · Post by **derr12** » Tue Apr 14, 2009 5:18 pm

oh forgot to mention it's a 2005 model srt-4

derr12 · Post by **derr12** » Tue Apr 14, 2009 6:35 pm

i can log a run if you want, but i wont go wot for long for fear of engine explosion @ 21psi. i have the unit updated to u7134-9r17.crom.

1srt4me · Post by **1srt4me** » Tue Apr 14, 2009 9:15 pm

I had the same problem. Re-load the stock tune back in. Disconnect the negative battery cable for 10 to 15 minutes to clear the computer. Then re-load the 93 tune again.

derr12 · Post by **derr12** » Thu Apr 16, 2009 11:06 am

did that yesterday, didnt seem to help. the one thing i do notice tho is that the boost comes on a little less strongly till just after 4000 rpm, and then it spikes to 19-21+ psi.

somethings funky. there sure are a lot of optiosn to log for. experts, if you are intersted in looking at this for me, what perameters would you like me to log for you?

johan · Post by **johan** » Thu Apr 16, 2009 11:24 am

Post up your last tune written so i can take a peak at it.

derr12 · Post by **derr12** » Thu Apr 16, 2009 12:19 pm

thanks, here you go.

derr12 · Post by **derr12** » Thu Apr 16, 2009 5:22 pm

ill xpresspost a free taco to the first person that suggests an idea that fixes my issue. driving around and not going WOT on an srt-4 is like hopping around with 1 leg.

sfla_srt4 · Post by **sfla_srt4** » Thu Apr 16, 2009 7:20 pm

well the only ones who can help you are the Diablo guys, they can only read and change your last tune...

derr12 · Post by **derr12** » Fri Apr 17, 2009 11:23 am

so you don't like taco's then? :p

derr12 · Post by **derr12** » Sat Apr 18, 2009 6:46 pm

Letxen3 · Post by **Letxen3** » Sun Apr 19, 2009 11:11 pm

when was the last time you had a boost leak test done? stock boost levels may be fine and wont over boost, but if you have a boost leak that leaks at lets say 16 psi the wga duty cycle with the 93 tune maybe trying to over compensate for the leaking boost and causeing a over boost.

21 psi spike in 2nd gear is fine, thats what i run. long as your not lean. do you have a wideband? also what is your boost like in 3rd gear? also can you post a log.

also do you have a 30/30 boost gauge or the factory 30/20?

johan · Post by **johan** » Mon Apr 20, 2009 8:43 am

Give this one a shot. there where some discrepancies in the tune you sent me.

derr12 · Post by **derr12** » Mon Apr 20, 2009 4:30 pm

A thousand thankyou's johan! Will give it a try after work and let you know.

derr12 · Post by **derr12** » Mon Apr 20, 2009 10:26 pm

ok, let it warm up and then here is what i logged. so far looks like the bugs are worked out. no more than 15psi for the gears i went thru. here is my log:

I think im good to start tinkering, out of curiosity, what did you find that struck you as odd?

stock srt-4 overboosting on 93perf tune.

stock srt-4 overboosting on 93perf tune.

RE: stock srt-4 overboosting on 93perf tune.

RE: stock srt-4 overboosting on 93perf tune.

RE: stock srt-4 overboosting on 93perf tune.