Advice - Piggyback Fuel/spark for Turbo

[Joseph Upson]

Yes, I have MAF. It is a 3100 (gen III) w/ 3400 top swap. Thats the only real mod so far. Turbo soon, hahaha, I'm so darn excited to get welding, wiring and then tearing down the highway!!!

Question, my stock injectors are old and the plastic band above the o-ring is warping from age/heat ect. Make it short, they are being replaced.

Is it ok to put in 36# injectors under stock pump? (tuning of course)

Cause I will be upgrading the boost down the road with stronger internals, the works. Having the 36#'ers ahead of that would be nice.

Run a good amount of cleaner through your stock injectors, tune using them first and after the car is running well then upgrade to the larger injectors to limit the potential tuning hassle. It's best to start simple and upgrade one step at a time. The same goes for tuning, either spark or fuel adjustments, not both at the same time. Make sure your injectors are compatible with the PCM. Some have low impedance drivers which is fine but if yours doesn't and you put low impedance injectors on it you'll burn out the drivers. If your injectors are 12ohm make sure the replacements are also.

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[Schmieder]

Run a good amount of cleaner through your stock injectors, tune using them first and after the car is running well then upgrade to the larger injectors to limit the potential tuning hassle. It's best to start simple and upgrade one step at a time. The same goes for tuning, either spark or fuel adjustments, not both at the same time. Make sure your injectors are compatible with the PCM. Some have low impedance drivers which is fine but if yours doesn't and you put low impedance injectors on it you'll burn out the drivers. If your injectors are 12ohm make sure the replacements are also.

Right, good advice. However, the old injectors lower plastic ring is somewhat melted/molded and I believe it may provide sealing issues. I don't want a vacuum leak at the injectors while tuning either.

I'll just have to spend some time adjusting for the new injectors, steady and slow as to avoid damages. The way I see it, it will run rich with untuned larger injectors which is much safer then running lean. Plus, I can compensate using math. With a fuel injector calculator and some time, I could probably get the required pulse width in the ball park figures and fine tune from there on out.

The injectors are designed for 3100/3400 swaps, 36#'ers with a rail adapter to compensate the different height. So compatibility isn't an issue. Just proper fuel/air mix is all I need to work out.

Btw, does HP Tuners have a scaling method of adjustment? The tuner package seems well diversified. I have no experience with it so i don't know. Otherwise, I'll just spend some time learning and applying at a safe rate.

and yes, tune one system at a time. That I completely understand.

Any advice on HP Tuners Suite would be appreciated. Especially in the region of fuel/spark control.

and I can finally get rid of that darn RPM stop limit, change shift points, ect. I found myself a new hobby, lol

[Schmieder]

I read a few well written HP Tuner tutorials. Man, my concept of tuning was flawed. I see now just how complex it is. But that is ok, I taught myself 3dsm which has a much larger learning curve. Along with Linux, Sonar3.0 and other high end applications.

This is going to be fun. Not only will I have a Turbo that is properly tuned, I'll have an excuse, for the wife, to go out and dog it around town. I'm out gather field data to tune, lol. This is great. I can even tune my shift points to keep it in the power range. And that is a good thing cause these grand prix's have a good torque edge in lower rpm's. I can help trans life by keeping it around 5.5K RPM.

I'm surprised at all the nifty stuff one can do with HP Tuners Pro.

Being the perfectionist that I am, I'm sure I'll data log nearly every time I drive around. The more info, the better.

After having a few years of data, I could start to incorporate variables per season of year. Variables for rain or sun, humidity, ect. Ehh, maybe that is going a tad bit too far.

Guys, I can't thank you enough for all the valuable info I have acquired here.

I'm going to sport a small 60degreev6 logo on my rear side window. Usually where roadside assistance tags are placed.

[robertisaar]

Being the perfectionist that I am, I'm sure I'll data log nearly every time I drive around. The more info, the better.

<---Guilty. it's addictive.

After having a few years of data, I could start to incorporate variables per season of year. Variables for rain or sun, humidity, ect. Ehh, maybe that is going a tad bit too far.

you'll eventually start seeing patterns and will be able to tune for it, rather than around it...

as for literally programming them: it's al machine code AFAIK, at least for OBD1, but i have seen a few OBD2 hacks and it was similar...

PITA learning curve to be sure. but for just tuning, it's not too bad.