For those of you with a 2.4L Cobalt, HPTuners and a turbo:

How did you do the tuning? Do you just swap on a 2 or 3 bar MAP, swap the injectors, rescale the IFR table, and tune using the given tables and just lose resolution?

or has anyone tried a piggyback system?

or what?

How are you guys tuning your turbo'd 2.4L's? LOL

I have the Cobalt in my sig and I think the time is near. I have already done a crapload to my GTO and my bike so now the Cobalt has to be baptized lol

It sucks that it doesnt have LSD but I plan to swap in a auto with LSD later anyways..right now Im kindof torn between a 4x4 ATV, and turboing the Cobalt... but I figure i can borrow my buddys ATV (LOL). So here I am thinking about going turbo.

I am pretty familiar with HPTuners, so any hints or tips would be greatly appreciated!

 

BennyHHR on here has done my tuning. I'm on the 2bar.

 

being familiar with hp tuners, and tuning a turbo 2.4 are two different things

 

So all you needed to do was swap the MAP sensor and injectors/fuel pump and get it tuned? Cuz if so, then Im pretty confident I could tune my own...

That'd be sweet!

I have a couple bills to pay but in the very near future I could be getting some of the stuff together

 

Yeah but thats why Im asking. Either way..if it CAN be done with HPTuners, I can do it.

The question is...how hard is it? Whats involved? Im about to go outside and download the tune and poke around and see what we have.

Hopefully it has a VE table, which would make it a shitload easier in my opinion.

 

it can be done yes, but u need to get the right sensors, the correct data, and the right pids and tables in hp tuners and set everything up correctly maybe joe (bennyhhr) will chime in hes one of the best tuners around here. i wont name names but some have tried and left the pcm seeing data that wasnt even there

 

LOL I can just imagine...I know I've seen many many people just try and set up the PIDs to get your AFR Error % histogram up and working right....and I've seen every single one fail. BUT if you keep messing with it yeah Im sure youll figure it out...

Im moving out in the middle of the nowhere up on a mountain and Im going to have a crapload of free time now so I figure nows a good a time as any to figure this stuff out.

Hopefully its been done enough times to where most of the heavy thinking is already done lol

 

What sucks is those ZZP transmission with LSD etc etc are like $3500 or so plus you need a converter too!

Craazzzyy

I paid only a little more than that for the whole car haha!

 

As long as you're not running straight e85 and stay around or below 32lbs/min of airflow, the stock pump should be plenty fine. 2bar maps, and injectors are obviously a must though. You also may want to consider relocating the maf to the coldside pressure pipe to use as a blow-through system.

I'm not sure if you've ever cracked into one of these ecm's or not, but just be prepared for a million and a half tables to dial in! Lol.. They're definitely a handfull particularly if all you've ever worked with is lsj's and lnf's like myself.

 

^^^^ this x 1000

 

nah..probably never run e85 at all...

Ueah I was thinking of mounting it after the turbo and before the engine... thats what you're saying right?

I figure theres no sense in putting it between the filter and the turbo...much more accurate reading after the turbo..

IDK I had emailed the file from my laptop to my gmail but it seems it didnt go through,,i need to resend it. Cant wait to take a peek!

Well thats good that theres no fancy gadgetry really needed... I was worried.

Im wondering what awesome codes its going to throw once it gets boosted? lol

 

Yeah i just got finished checking all the table and yupppp..its gonna sucks BALLZ to tune haha!

 

Yeah exactly. Place the maf on the straightest part of the pipe as possible about 10" or more away from the tb on the coldside pressure pipe. It can give you some fits with dialing in, but it works much better that way.

A buddy of mine has a boosted le5 on e85 and 80's that I'm still trying to dial in for him. The thing pulls like a freakin beast but the maf is giving me some issues and we also reached the limits of his fuel pump at the moment so it's leaning out over 5500rpm with 15psi. For now I haven't even touched his ve tables so he's running purely off the maf over 1500rpm and as soon as he hits possative manifold pressure.

So yeah, there's really not any "gadgetry" aside from a wideband that you will need but it's still definite gonna be a fun time dialing it in man.

 

Badass man, good info to know.

I feel dumb, but I cant seem to even find a VE table on this tune... is it like the new Gen IV V8s, where there is no "VE Table" but only coefficients which are used to create a "Virtual VE" and then you modify that virtual VE and convert it back into coefficients?

Cuz I looked everywhere and I didnt see a VE table??

 

Do 2.2/2.4 have same fuel pump as LSJ/LNF?

 

Oh and yeah I have a bunch of widebands laying around... I usually use it to tune Gen III V8's

 

It is easy to tune ........ Tables you want to keep an eye on is the same as any other. Maf, timing and pe. And of course cam phase timing...

 

thats a good question?

 

Yeah if I just tune the MAF it should be fairly easy, but what if I swap in a worked over motor later...just tuning the MAF wont be enough right?

I know Im getting way ahead of myself here, I dont even have it turbo'd yet but I like to think everything through lol..Im a worryer haha

I was looking at the built motors ZZP has and I cant entirely dismiss the idea of a built motor later

I have a bad habit of pouring money into my daily drivers when I have a hot rod in the garage already XD I just cant stop myself! lol

 

Says the guy who basically tunes in his sleep.... lol.. So it's totally fine to keep everything purely on a maf tune and basically stay clear of ve and speed density tables?

I'm not gonna lie man, the le5 has been the toughest one for me as of yet, but I'm also always still learnin from folks like yourself so I'm all ears brotha..

I can dial in a solid/safe tune but it just may take me a little longer..

That I definitely don't know either, but it is a good question. I do know that the pump went much further than I expected especially on e85 and 80's but I don't know how it compares to the lsj or lnf pumps.

See that's basically always been my understanding as well. I hate to think what would happen if the ve and/or speed density tables weren't adjusted correctly and the maf ***** the bed. Hopefully James is willing to spread some more tuner knowledge, because I'm sure you'd like to hear it just as much as I would..

 

You can tune the ce coefficients.. Just like the lsj and etc.. But the tables he will need to adjust is the map scallers. idle spart and etc. (its honestly just like a ls series with the timing part for the idle if cammed) also injector scaling, and including pe tables. Id honestly get in bed with the car first and rub its tummy and ask what it likes lol.. But learning purposes its fairly close to lsjs and etc, but it has cam phasing and a little more. If you want a base file let me know and ill send you one!!

 

If the maf fails it will go to VE.. So yes i recommend it. Just make sure its done right lol!!!

 

Yeah thats what Im worrying abot...if the MAF craps out its boom betty byebye lol

and yeah Im all ears on tuning the coefficients...I usually try n steer away from the newer Gen IV pcms because its wayyy easier to tune the older ones..

Looks like Im going to have to brush up on this! Good thing Im going to actually have the free time to play with it finally!

 

But like i said, i am willing to give you a base if you want one.. Just if i do and you use that file, i would like some logs to make sure everything is going smoothly!

 

Also your in tennessee. Why havent you ever made it to my tuning meets...