SRT4 93tune Improvment request U7134

SCGt94 · Post by **SCGt94** » Fri Aug 28, 2009 10:25 am

yea same map i sent you slyder, though a/fs should be around 11.9. I did notice on the 05 i did that as it approached redline it did go rich..around 10:1. Now i believe everyone thinks this is the cat overtemp thing kicking in, but in the 05 tunes it is off. Brian did leave that last pressure ratio row stock (air fuels around 10:1) but boost should never get that high on this tune with a stock turbo, but i could be wrong. I believe he left it that way as an over boost protection measure.

No problem slyder, happy to help!

SCGt94 · Post by **SCGt94** » Fri Aug 28, 2009 10:29 am

boomquest wrote:
SCGt94 wrote:i believe i had replied to everyone who sent me an email
I think you missed me. I'll email you again.

Thanks.

wade did you get it this time? I resent it.

boomquest · Post by **boomquest** » Fri Aug 28, 2009 11:46 am

SCGt94 wrote:
boomquest wrote:
SCGt94 wrote:i believe i had replied to everyone who sent me an email
I think you missed me. I'll email you again.

Thanks.
wade did you get it this time? I resent it.

Yes I did get it. Thanks for sending it so quickly.

I loaded this tune onto my car & it seems to have improved it. But I'm still getting some knock when I'm real heavy onto the gas. This tune did reduce at least 50% of the knock I was getting. Should I try to datalog & send you the info?

I'm a lttle inexperienced with datalogging. Hopefully I'll do it right & send it to you to look at.

duster360 · Post by **duster360** » Fri Aug 28, 2009 1:07 pm

boomquest wrote: I loaded this tune onto my car & it seems to have improved it. But I'm still getting some knock when I'm real heavy onto the gas. This tune did reduce at least 50% of the knock I was getting. Should I try to datalog & send you the info?

I'm a lttle inexperienced with datalogging. Hopefully I'll do it right & send it to you to look at.

Your A/F is VERY important. Do you have a widband O2 sensor?

With Don's improvements I had an A/F of 12.8-13.6 at WOT---with 6 degrees of KR. +15% fuel dropped the A/F to 11.7-12.2(perfect) and Knock is usually 0.

SCGt94 · Post by **SCGt94** » Fri Aug 28, 2009 1:19 pm

damn duster, your a/f's went that lean huh? Im guessing you have a bit more mods then the 93 tune can handle?(forgive me i cant remember whats done to your car) In the tune I am commanding 11.9. On the car i had here it had intake, exhaust and stock boost and did exactly what was told of it. However i did have that adjustalbe wastegate on it and boost never got higher then 15 lbs.

boomquest · Post by **boomquest** » Fri Aug 28, 2009 1:25 pm

duster360 wrote:
boomquest wrote: I loaded this tune onto my car & it seems to have improved it. But I'm still getting some knock when I'm real heavy onto the gas. This tune did reduce at least 50% of the knock I was getting. Should I try to datalog & send you the info?

I'm a lttle inexperienced with datalogging. Hopefully I'll do it right & send it to you to look at.
Your A/F is VERY important. Do you have a widband O2 sensor?

With Don's improvements I had an A/F of 12.8-13.6 at WOT---with 6 degrees of KR. +15% fuel dropped the A/F to 11.7-12.2(perfect) and Knock is usually 0.

No I don't have one. I did just do a datalog run. I don't know if I did it right. It's a little hard to find a decent/safe road to do this around here. I'll send it to Don & maybe try to post here.

boomquest · Post by **boomquest** » Fri Aug 28, 2009 1:50 pm

I think (???) my air/fuel was 11.7 till about 4700 rpm with ST knock at 5.5, then dropped down to I think 8.9 @ 5000 rpm, then started climbing again. It appears A/F was at 9.4 @ 5900 rpm.

Again, I don't quite have a clue how to read this properly. I could be reading things wrong. I think I emailed this log properly to Don.

SCGt94 · Post by **SCGt94** » Fri Aug 28, 2009 2:08 pm

those numbers you are seeing in the datalog are what the ecm is commanding, but not what the car is actually getting (a/f wise), i sent you an email boom, without a wide band its tough, but we can rule out a few possible causes without it.

duster360 · Post by **duster360** » Fri Aug 28, 2009 3:54 pm

SCGt94 wrote:damn duster, your a/f's went that lean huh? Im guessing you have a bit more mods then the 93 tune can handle?(forgive me i cant remember whats done to your car)

Tune is fine im sure.

I don't have anything special to explain such a lean A/F. 93 tune A/F has always been fine(11.4-12.0) because my PCM has always thought my injectors were a little smaller than they eally are. After you scaled the injectors along with this update, I was taken aback when the A/F shot up to 13.6.

Commanding 10-10.4 works just fine though.

I honestly think my fuel system is a little tired. Fuel pump doesn't sound real happy on initial prime. The kid I bought it from jacked around with the pressure regulator, since all was good(fp checked out stable at WOT,fp voltage ok too), I never pulled it out. I think its time to check WOT pressure again.

slyder · Post by **slyder** » Fri Aug 28, 2009 10:50 pm

ya I"m 05 and the WOT were ALL 10.2 and it didn't spike over 15 psi.

I was messing around with the boost and my afr's were still 10.3 WOT, need more time to play and less rain here.

-Slyder

akula · Post by **akula** » Sat Aug 29, 2009 11:57 am

My A/F is 11.7 all the way @ WOT, i have 4 ST Knock @ 5000 RPM, i noticed that the base time @ 5000 is 30 degrees whit +8 of a advance, maybe whit 2 degrees less of advance @ 5000 eliminate the knock.
Tested @ track in 1/4 mile 5 times whit 92 premium fuel.

HTASRT · Post by **HTASRT** » Fri Sep 04, 2009 12:26 am

My afr stayed the same kr stayed the same at 6kr timing dropped from 18 adv to 15adv.

Krazyrdr83 · Post by **Krazyrdr83** » Sun Sep 06, 2009 10:22 am

so. any updates to this? i'm thinking of trying it out

Krazyrdr83 · Post by **Krazyrdr83** » Thu Sep 10, 2009 8:23 am

Krazyrdr83 wrote:so. any updates to this? i'm thinking of trying it out

.....? lol, i haven't seen any updates on either forum. hell i'm still running the 9r15 crom

SCGt94 · Post by **SCGt94** » Thu Sep 10, 2009 5:20 pm

still playing around...im actually over on srtforums.com speaking with everyone who uses our stuff. I am awaiting a stage 1 cal from a guy to add, a green light to make cot an adjustable parameter (on/off) and just tweaking the tunes. I just had a car in here...damn near same mods at the last one...a tweaked 93 tune commanding 11.9 i got 12.7 through most of the rpm range. These cars are very temperamental. I had to tweak the ve's abit to get the air fuels back in line. I got 19 lbs peak and tapers off to 15 my redline. It also held peak power from 5 to redline. On the street it was around 11.3-11.6 @ wot. On the dyno it was around 11.7-11.9.