SRT4 93tune Improvment request U7134

[duster360]

This part is more important. I was under the impression (given by mikel) that ALL ds tunes reduce/raise the threshold. So they would be writing to the knock tables.

Is this not true for the SRT4 tune?

huh??? You must be reading the wrong thread again,,,,Did you read Mike's last post????? I even quoted it once

nevermind here it is for the third time

I asked around, and the reason we did not mess with the knock sensors is because we do not add any timing inthese tunes, in fact some have a bit of timing pulled, thus we did not think it would be necessary, especially on a stock car.

The idea was if you really wanted the sensors desensitized, you'd likely be running a custom tune anyhow, and you could have the tuner set your knock thresholds however you'd like.

Thanks
Mike

[duster360]

yea i think its necessary and it will be on the next update. If you guys wanna give this one a try let me know, send me your ori ill send you a custom tune. What kind of boost are you guys seeing on the 93 tune?

With a stock wga and depending on the charge temps, boost peaks around 19-22psi and will fall to 12-14psi at 6000rpm.

Ill send you my .drg file when I get a chance.

[SCGt94]

damn...i didnt realize the tune bumped it up so much. No wonder why i didnt pick up much power haha, since he had the adjustable waste gate it peaked at 15 and tappered off to 11. Ok so that makes alot more sense with the way the tune is, bc with those boost levels you will deff be hitting the top of the timing tables with that.

[duster360]

with those boost levels you will deff be hitting the top of the timing tables with that.

Yeah it'll top out the MAP sensor but only briefly. Since the SRT-4 is blessed with a turbine scroll the size of a hermit crap shell, boost drops off pretty quick past 4000rpm.

Most guys think a $150 wga will help but boost still drops like a rock. Since the 93 tune works so well with the stock wga, its the one I prefer.

[SCGt94]

Well slyder did a log for me, he saw .5-1 degree pulled on the new tune i sent him. It's a good start

[SCGt94]

knocks been reduced to about a .5-1 degree. I smoothed the torque tables out for you guys too. Is there anything else you guys want to see done to these tunes? The cat over temp thing i havent really messed with, 03 is missing the parameter but the others have a 1700 degree threshold. Since these tunes need to be pretty generic i dont want to touch that, i dont mind writing some custom ones for a few guys with stock to mildly modded cars with it taken away. I also managed to take a look at the pt cruisers, they have some seriously high thresholds for knock, however then run some pretty low timing to begin with so..

[mikel]

03 tunes need the min rpm to enable high airflow test set to 8160, it is done in the 04 and 05 tunes...

[slyder]

knocks been reduced to about a .5-1 degree. I smoothed the torque tables out for you guys too. Is there anything else you guys want to see done to these tunes? The cat over temp thing i havent really messed with, 03 is missing the parameter but the others have a 1700 degree threshold. Since these tunes need to be pretty generic i dont want to touch that, i dont mind writing some custom ones for a few guys with stock to mildly modded cars with it taken away. I also managed to take a look at the pt cruisers, they have some seriously high thresholds for knock, however then run some pretty low timing to begin with so..

I'll test a COT tune if you want

-Slyder

[concoursd]

did you ever wonder why diablo sells catch cans for the srt4? It could be because the PCV systems that chrysler is using are causing major knock when the oil is ingested during combustion.

[gizmodo]

I've had a catch can in my car since day one and I still get the same knock as everyone else.

[duster360]

I've had a catch can in my car since day one and I still get the same knock as everyone else.

ditto, i've had one for almost 4 years

[duster360]

03 tunes need the min rpm to enable high airflow test set to 8160, it is done in the 04 and 05 tunes...

With my 03 PCM(242ai) I have never once had a P2074. Stock tune , Stock tune+SAFC, DSP tune,,,stock waste gate or Stiff aftermarket, On or off PCM boost control. I even had a 04 S1 PCM(055ae) for a while and it was fine too.

maybe my car is just a freak, but I never once had a problem in 4 years with that code.

[Letxen3]

I also managed to take a look at the pt cruisers, they have some seriously high thresholds for knock, however then run some pretty low timing to begin with so..

that sucks...so when will the new .crom be out?

[SCGt94]

im working on updating all of it as we speak, a couple of days probably...damn pt crushers have alot of cal ids haha

[Chromenut]

Okay, I'm not as technically into this as all of you but I do have a custom tune that's gone to shit from Rage, and am currently running the 93 tune, but not liking it as much as I thought I would. Not all that much in performance gains and getting almost 8* of knock now on my last three pulls. It's high enough in the band to not bother me in normal driving conditions but I also don't want it knocking down my top end and trap speeds.

So, how will the changes spoken on here affect my PT and how do I go about getting them? Are they just going to be in the latest CROM release, or will we be getting a new 93 tune? Just curious, been hovering in the background watching this and finally thought I'd ask my silly questions...

Letxen3 - drop me a line dude, I've not heard from you in a long time now and wondering how it's going down there in the land of the lost...lol... also catch me up on your PT and how it's running with that new clutch!!!