Talked to a local co. called hybrid dynamics and they will let me use the dyno and have some of the other cobalt members that are good with hp tuners come to tune my cobalt 2.4 turbo. My canned tune from hahn is ok but i would like a better more custom tune since in the winter i run lean and in the hotter part of summer i run rich and it cant be tuned with just a boost fueler to get rid of the cel. Just wondering with the hahn return fuel system, does that create an issue with tuning or will it not have any impact on the tuning process much?

 

So Dennis is telling you other people are going to tune your car, without actually asking them first? Doesn't seem like good business practice. Unless I am thinking of different people.

Did he tell you who was doing the tuning work?

 

no, he said that dan or al might want to do that with hp tuners but I would have to ask them. he only said that since they have more cobalt tuning experience than he does. I'm trying to figure that all out now.

 

Didn't you try getting tuned around last year, but didn't have a wideband? Have you gotten a wideband yet? If not, how do you know if your running rich or lean.

 

hybrid dynamics is where i wanna go to dyno and they plug in a temp air/fuel guage in place of the stock o2 sensor to read af ratio.

 

DOH!

Yeah...........good luck with that.

Besides, what he meant was you said you were running lean in winter and rich in summer. Without a wideband to tell you exactly HOW lean or rich, nobody in their right mind is going to tune that.

 

i figure there has got to be a better tune than i currently have

 

Right, there probably is. But unless you do it yourself, no one in their right mind is going to want to touch a car without a wideband.

 

Isnt Hahn's tune locked? If so anyone with HPT is not going to be able to read the ECM let alone re write a tune onto it.

 

maybe it's erasable.

 

I thought Al said it was definately erasable.

 

hahns tune are not locked anymore as i asked bill about a month ago..

 

Im pretty sure the ones of us with the HAHN tune are locked.

However, to my knowledge. You cant view the tune, but you can erase it and start over.

 

If you do that I hope you have your stock tune to but back on. I would not delete it with out it.

 

well i was thinking the person tuning my car would have the stock tune saved or at least a baseline.

 

if you go to a legitimate shop they should have a way of monitoring AFR without you yourself having to go out and buy a wideband

but if they are basically retuning your car from scratch I would expect to pay $500-$600 on a dyno tune

it might be more trouble than its worth if you're going for a complete retune...unless you are hitting AFRs that put your motor at risk it may not even be worth it.

btw, where the hell are you hiding? i need to get a look at this turbo 2.4

 

You don't even have a stock tune to work from????

Most of the local tuners will only tune if you have a wideband because they like to know exactly what they're fixing. Especially when he says there's an issue in both winter and summer. They could tune for whatever the conditions are at the dyno and then guesstimate for the other, but not many are going to want to do that because if they dont' get it just right, then there are problems. That and it seems like they prefer road tuning because it's more real-world, and I can definitely see why. At the very least, they'd want to know what sort of actual AFRs are being hit under every day conditions to see what they're trying to correct.

 

i have a stock le5 tune you can work from.

I think you're tuner is going to have a great time, copying and pasting all 400 something tables! That's going to be a couple hours right there! Because when you erase your tune, that's what is going to happen. Your computer will be erased/formatted/clean. No information.

So your tuner will have to copy and paste all the tables from a stock le5 tune, then begin to tune your n/a car for boost from scratch more than likely on a dyno and not on the street.

 

ur tune mite be unlocked..only one way of figuring that out...or call up hahn...he is going to stop locking the tunes from we he told me cuz im interested in his kit...and i use hptuners so iwould like to adjust it

 

well i could ship the pcm back to hahn to restore the stock tune if its a big deal, no problem with that just thought it was a simple thing to erase then upload a new tune but i dont know much about tuning at all really.