Can it be done with hpt?

If so...what is involved?

Is there a 3 bar map sensor that fits , or just the older style with hose

What is the boost limitation of oem head gasket?

Car is 2006 Cobalt with s/c and now a turbo as well....25 to 30 psi!!

Thanks

 

I'm running 24-25psi on all the stock sensors, and the car runs just fine within their parameters obviously tuned with HPTuners though. I'm not sure if you can hit 30psi on them though as I don't think anyone has tried it yet. I blew the stock headgasket at 18psi, but my car is different than everyone else's for that matter. Cometic headgasket and Golden Eagle Studs FTW!

 

I'm kind of a newbie on this forum but have had the car since it was first realseased. I've done tuning for years because thats kind of what i get paid to do lol...... running that much psi on stock sensors is kind of pushing the limits. In a SVT Cobra i had a few months back the car was set to run at 26 psi when in actuallity the car was only running at 33 psi. The sensors can only do so much in their stock stage. Other wise your gonna get different readings then what is actually happening. I mean if you can afford to take the cahnce then do it.

 

we have a 2.5 bar map sensor stock, that's like what 32 psi or something

 

Hard way: Yes, with the latest version of HPTuners just released you can finally rescale a MAP sensor. You have to fake the axis values in the VE table though...kinda like the supercharged Jbody guys do it. We have a 2.5 bar (~22psi) map sensor stock with a 2 bar VE table so scale accordingly.

Easy way: These cars only use a MAP sensor when the MAF fails as far as air metering is concerned. Upgrade to a higher flowing MAF or increase intake pipe diameter and disable the MAP overvoltage code and you can run as much boost as you like.

 

How do you change the values on the x and y axis? i have the latest version of HP tuners but cant seem to figure it out. I was also planning on going to a 3 bar as well once the turbo project is finished.

 

Is this the black one at Speed Shop?

 

You don't change the axis values themselves, you simply have to accept the fact that they no longer mean what they say, hence the term "fake 3 bar tune". You purposely rescale the MAP to an incorrect slope...say 5v=200kpa instead of the 300kpa a 3 bar MAP really would read at. Then in the 200kpa column you would tune accordingly although knowing you were actually tuning for 300kpa. Since the axis values cannot be changed you only use them to set a scale on your new MAP. The method I have used is to remember the highest value your table uses (215kpa in our case) and that would represent 100% of your new map sensor (or 300kpa with a 3 bar). Figure the math for every value between 0-215 and scale to your new sensor accordingly. ie. 100kpa on the VE table would actually be 139kpa manifold pressure and so on.

This method would be used when you don't want to use a MAF and have no option for a standalone/piggyback but can recal the stock VE. 02-05 Cavalier/Sunfire Ecotecs are a great example. We have a MAF so that route is best unless you are 100% dead set on eliminating the MAF and running speed density and doing things the hard way (djt81185 ).

 

ya that is how i figured on how to do it. I just thought that you could actually change the values in the VE table X axis to make things easier.