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Any LT1 OBDI tuners?

BoostedZ

BoostedZ
Feb 21, 2015
52
0
I already asked them and they only do 98-02 OBDII LS powered vehicles. I tried Modern Muscle in Plainfield and the same thing with them. I guess my only option is to try with Straightline Performance. If they don't do it, then I guess I have to do a mail order tune.
 

Aron

TCG Elite Member
Sep 1, 2005
15,173
3,076
I assume you want a dyno tune? Last I heard Straightline did them still. I don't have any experience with them, I don't know how good their tunes are. I'm not sure of any other shops around that do it.

I went through the same thing a few years ago when my car was tuned. I had MadZ28 do mine, but I know he also stopped doing them.

As for mail order tunes, the two main ones these days is pcmforless and Solomon.
 

Aron

TCG Elite Member
Sep 1, 2005
15,173
3,076
Worst case scenario, if you're open to it and you can find somebody that will tune it remotely, I do have a laptop with tuning and datalogging software. You'd have to pay for dyno tume and pay the tuner his fee, but I would meet up with you to load the tunes. Like I said though, that's worst case scenario, as it's a pain in the butt. We would need another computer there to send/receive the emails with the tunes attached. You then save the files to a cd, then put the cd into my computer to load into the car
 

Thirdgen89GTA

Aka "That Focus RS Guy"
TCG Premium
Sep 19, 2010
19,295
15,653
Rockford
Real Name
Bill
I'm pretty much tuning my own car. I have heads/cam so its pretty far out from stock now. Wideband is in the mail, and once its all wired up, I'll schedule dyno time. I got a good deal on a shop, $90/hr for dyno time. Probably only need an hour, but I might just schedule 2. Over the past few weeks I've just been familiarizing myself with all of the tables and reading up as much as possible.

I've got a handle on almost every table now and how it affects the other tables. Along with the WOT AFR formula. So it'll just be a case of getting it on the dyno and load testing it.

I figure on 2 hours because then I can take my time with specific load tests and not just WOT tuning.
 

Xfirez51

Fast BoyZ of IllinoiZ
Jan 1, 2013
1,795
6
Northwest Chicagoland
I'm tuning closed loop w/maf hooked up. I want to keep the MAF if I can. I don't think I'll exceed the 512gm/s limit.

AFR 195cc heads
LE 231-239 on a 110LSA
ported everything
usual bolt-ons.

Well C/L means you'll be using BLMs not WB AFR.if you haven't visited
thirdgen.org, you should. One of the best sources for tuning information when it comes to OBD1 GM engine controls.
 

Thirdgen89GTA

Aka "That Focus RS Guy"
TCG Premium
Sep 19, 2010
19,295
15,653
Rockford
Real Name
Bill
The wbo2 info came from TGO. Been on those forums for years. Blm 128=stoich on GM pcms. But it's also an average. So you pipe the wbo2 into the pcm and log it time stamped with map, MAF, and the other values.

May not always want STOICH, like for highway cruising it may be more beneficial at low MAP values to advance timing and run a bit lean.

Bigger cams want more advance at low MAP values. I'm only running 10.7:1, so my car should be plenty happy running 93 Octane.
 

Xfirez51

Fast BoyZ of IllinoiZ
Jan 1, 2013
1,795
6
Northwest Chicagoland
The wbo2 info came from TGO. Been on those forums for years. Blm 128=stoich on GM pcms. But it's also an average. So you pipe the wbo2 into the pcm and log it time stamped with map, MAF, and the other values.

May not always want STOICH, like for highway cruising it may be more beneficial at low MAP values to advance timing and run a bit lean.

Bigger cams want more advance at low MAP values. I'm only running 10.7:1, so my car should be plenty happy running 93 Octane.

Well actually, not really. It's a misconception to think that 128 is = stoich.
For starters, stoich here is more like 14.2:1 w the 10%. The cal probably needs that modified from 14.7. I am more familiar w Speed Density than MAF but really they are two different ways of calcing air flow. One direct, one derived.
So you could start off keeping the cal in Open Loop and use the WB to rough in the tables, but then enabling Closed Loop and using the BLMs to get part throttle and idle on the spot.
Also, what overlap does the cam have? You very likely will need to address idle since most times the ECM is misinterpreting the fresh air drawn into the chamber and out the exhaust as a lean condition . Again, this is in Closed Loop.
Also need to disable functions like DFCO, EGR, Canister to tune properly. Min Air adjustment is also VERY important for proper IAC operation.
Just another note for now, and that deals w the correct Injector Offset v Volts.
Are these the stock injectors or aftermarket?
Some thought starters.
 

Thirdgen89GTA

Aka "That Focus RS Guy"
TCG Premium
Sep 19, 2010
19,295
15,653
Rockford
Real Name
Bill
Well actually, not really. It's a misconception to think that 128 is = stoich.
For starters, stoich here is more like 14.2:1 w the 10%. The cal probably needs that modified from 14.7. I am more familiar w Speed Density than MAF but really they are two different ways of calcing air flow. One direct, one derived.
So you could start off keeping the cal in Open Loop and use the WB to rough in the tables, but then enabling Closed Loop and using the BLMs to get part throttle and idle on the spot.
Also, what overlap does the cam have? You very likely will need to address idle since most times the ECM is misinterpreting the fresh air drawn into the chamber and out the exhaust as a lean condition . Again, this is in Closed Loop.
Also need to disable functions like DFCO, EGR, Canister to tune properly. Min Air adjustment is also VERY important for proper IAC operation.
Just another note for now, and that deals w the correct Injector Offset v Volts.
Are these the stock injectors or aftermarket?
Some thought starters.

I already modified the offset tables based on the Ford Spec sheets. Injector constant has been adjusted to match pressure and flow.

I've already tuned out all of the emissions stuff since its long gone. DFCO I haven't touched.

Charcoal canister cannot be disabled on LT1's, you turn off the code. Every thread I've read on those who have changed the constants to cause it to never get in use has has BLM issues because apparently the LT1 PCM does something with that constant for other fueling.
 

Xfirez51

Fast BoyZ of IllinoiZ
Jan 1, 2013
1,795
6
Northwest Chicagoland
I already modified the offset tables based on the Ford Spec sheets. Injector constant has been adjusted to match pressure and flow.

I've already tuned out all of the emissions stuff since its long gone. DFCO I haven't touched.

Charcoal canister cannot be disabled on LT1's, you turn off the code. Every thread I've read on those who have changed the constants to cause it to never get in use has has BLM issues because apparently the LT1 PCM does something with that constant for other fueling.

Well you r moving in the right direction. Disable DFCO otherwise you'll be looking to add fuel in the high vacuum areas of the fueling table. Also once again, if you are using the WB to tune, need to prevent Closed Loop from activating.
 
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