Tuneing problem with STS
Tuneing problem with STS I am having a huge problem with my new STS kit. We had my car on the dyno yesterday and it pulled some decent numbers 455/450 at 5psi but it has a lot more. My problem is that every time we did a pull my engine hit 100 percent load at about 3700 rpms which sends it into a protection mode. From 3700 up it was pulling my timing down to 11 degrees and it was just nose diving. There was no knock retard and my IAT's were only about 120 and the guy at the dyno tried everything he could think of with LS1 edit to correct the problem but had no luck. Have any of you guys had this problem running forced induction with a stock MAF or do you have to change it. Any ideas and help are greatly appreciated. Thanks
The guy at the dyno said that it should never hit 100 percent load. When it hits 100% it goes into default mode which ignores the tuning you put into the ecu. The car pulls great up to 3700 but then it pulls my timing down to 11 degrees of total advance and nose dives the power because it thinks that something is wrong. By the way I did leave the cam in and it seems to be working good. I know that the car has more in it since the timing should end up around 18 to 20 degrees of advance.
Originally Posted by Blackbird
the guy at the dyno has no clue what he is talking about.
get a new tuner.
get a new tuner.
1st there's no 100% load even available to look at.
2nd, there's no way you are maxing anything out with only 5 psi and that power level.
Been there, done that.
My guess is he doesn't know enough to go into the advance tables at the upper end of the air load scale and make the changes.
Find someone that knows what's up
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Just for testing, make sure your high octane and low octane timing tables match...and also even though you are not showing it, put the allowable KR to 1-2 degrees only. I assume he is editing those tables, or at least the high octane advance...if not then yes get a new tuner.
Also there is a table where you can check how much retard per IAT and if for some reason at 120 it is removing a ton of timing, that could be the prob. But 120 is not bad and it shouldnt start pulling timing until about 150 in a stock table I'm pretty sure.
Will let you know if I think of anything else..
Also there is a table where you can check how much retard per IAT and if for some reason at 120 it is removing a ton of timing, that could be the prob. But 120 is not bad and it shouldnt start pulling timing until about 150 in a stock table I'm pretty sure.
Will let you know if I think of anything else..
TECH Fanatic
Joined: Mar 2003
Posts: 1,839
Likes: 0
From: La Porte, TX
Not related to your question but I do have some question about your setup. What is the compression ratio of your engine? Did you lower it at all when you added the turbo? I really want one of these kits, but I'm running 11.5 c/r with a G5X-3 cam. I don't want to boost anymore than 5 psi. I'm just wonder what compression you're running that 5 PSI with and if I can get away with doing it at 11.5 c/r?
Find someone who knows how to tune for a turbo while you're out looking.
BTW, if he didn't change the IAT add table, that's where your timing is being pulled from (and a great example of why you need someone who can tune for a turbo).
BTW, if he didn't change the IAT add table, that's where your timing is being pulled from (and a great example of why you need someone who can tune for a turbo).
TECH Regular
Joined: May 2003
Posts: 404
Likes: 0
From: Jacksonville, FL
Originally Posted by 2ktransam
I am having a huge problem with my new STS kit. We had my car on the dyno yesterday and it pulled some decent numbers 455/450 at 5psi but it has a lot more. My problem is that every time we did a pull my engine hit 100 percent load at about 3700 rpms which sends it into a protection mode. From 3700 up it was pulling my timing down to 11 degrees and it was just nose diving. There was no knock retard and my IAT's were only about 120 and the guy at the dyno tried everything he could think of with LS1 edit to correct the problem but had no luck. Have any of you guys had this problem running forced induction with a stock MAF or do you have to change it. Any ideas and help are greatly appreciated. Thanks
120 is not high for a non-intercooled V8.
My stock bin (LQ9) pulls 5* of timing at 122* and up to 10* timing at 167*. For FI, you need to open that table up quite a bit from stock, or you'll never be running out of the unaltered HO table.
Thanks WS6 I hope she scoots 
My stock bin (LQ9) pulls 5* of timing at 122* and up to 10* timing at 167*. For FI, you need to open that table up quite a bit from stock, or you'll never be running out of the unaltered HO table.
Thanks WS6
I hope she scoots Ok guys, I just got a call from my dyno guy and my car is finished. He fixed the timing problem I was having but now my 255 fuel pump has ran out of steam. Here is what my car did at 5.5 pounds of boost. The dyno pull started at 2400 rpms and it hit 400 rwtq at only 2700 rpms, it hit 467 rwtq at 3600 rpms and stayed there until 5250 when it started dropping off. He managed to get 498 rwhp at 6000 rpms and he said he could probably do better through the whole range if I put an inline fuel pump on. Another thing that I love about this kit is that whith the upgraded turbo (t67 instead of t60) my IAT's were only 125 degrees with no meth injection or intercooler. I am going to pick the car up tomorrow and if i can figure out how to post the dyno graph I will post it right away. I can't wait. 
Originally Posted by Transdamit
hey harlan,i need a vid of that wheelie in you sig,do you have one because that is awsome,and yes try another tuner
2ktrans..
You should not be outta pump w/ a 255 at that level, even running it non referenced (ie stock configuration). Is he seeing a drop in FP, or a lean condition on the Wideband (assuming he's smart enough to have one)? W/o a referenced regulator he's gotta add the fuel manually in the PE settings.
Originally Posted by y2khawk
https://ls1tech.com/forums/showthread.php?t=215248
2ktrans..
You should not be outta pump w/ a 255 at that level, even running it non referenced (ie stock configuration). Is he seeing a drop in FP, or a lean condition on the Wideband (assuming he's smart enough to have one)? W/o a referenced regulator he's gotta add the fuel manually in the PE settings.
2ktrans..
You should not be outta pump w/ a 255 at that level, even running it non referenced (ie stock configuration). Is he seeing a drop in FP, or a lean condition on the Wideband (assuming he's smart enough to have one)? W/o a referenced regulator he's gotta add the fuel manually in the PE settings.