made intake, but ecu kills boost after a while
That's why you can't just slap parts on the car to increase air flow or do things like mechanically increase the boost. Those same sensors will tell the computer there is more air mass than it expects to see and therefore will attempt to compensate and bring it back under control (normally by lowering boost but it does use a drive-by-wire electronic throttle and the computer also has control of that). We might be able to trick some sensors (and then the computer) to get it to work with certain modifications and try to get more power but that's not the best solution.
As it currently stands, mechanical modifications may give a very brief increase in performance but the computer has an adaptive learning capability and will try to compensate for what you've done. That means we're not going to see large gains from easy bolt-on style parts, but if you alter the stock calibration/tune in conjunction with those modifications you may see nice power gains and retain stock-like drivability.
As it currently stands, mechanical modifications may give a very brief increase in performance but the computer has an adaptive learning capability and will try to compensate for what you've done. That means we're not going to see large gains from easy bolt-on style parts, but if you alter the stock calibration/tune in conjunction with those modifications you may see nice power gains and retain stock-like drivability.
I contacted him, but in order to get a newly tuned PCM, would have to order a PCM, have it reflashed at the dealership with an OS(not good), then send it to him, and pay $300...
great in theory, but will be expensive... I would get him to tune me a pcm if he had units he could ship out flashed, but buying a PCM here, sending it there, etc... its just not worth it, he'll be great for people that just want to get their pcm flashed, though even then, they would be without a car for like a week...
where as GMroadsters will just send you a tuned PCM for $700, by far the best route for those of us wanted two PCMs
great in theory, but will be expensive... I would get him to tune me a pcm if he had units he could ship out flashed, but buying a PCM here, sending it there, etc... its just not worth it, he'll be great for people that just want to get their pcm flashed, though even then, they would be without a car for like a week...
where as GMroadsters will just send you a tuned PCM for $700, by far the best route for those of us wanted two PCMs
I contacted him, but in order to get a newly tuned PCM, would have to order a PCM, have it reflashed at the dealership with an OS(not good), then send it to him, and pay $300...
great in theory, but will be expensive... I would get him to tune me a pcm if he had units he could ship out flashed, but buying a PCM here, sending it there, etc... its just not worth it, he'll be great for people that just want to get their pcm flashed, though even then, they would be without a car for like a week...
where as GMroadsters will just send you a tuned PCM for $700, by far the best route for those of us wanted two PCMs
great in theory, but will be expensive... I would get him to tune me a pcm if he had units he could ship out flashed, but buying a PCM here, sending it there, etc... its just not worth it, he'll be great for people that just want to get their pcm flashed, though even then, they would be without a car for like a week...
where as GMroadsters will just send you a tuned PCM for $700, by far the best route for those of us wanted two PCMs
The stock air box setup already is a cold air intake so I'd like to see some independent testing as to what, if any, point an aftermarket intake becomes beneficial. With a tune maybe there will be minor gains from going to an aftermarket intake on an otherwise stock car but maybe the stock air box with a good filter will outflow what the stock turbo is capable of.
We don't know for certain there will be gains and I'd take an aftermarket company's claim of gains with a grain of salt. They're in the business to sell you parts. Unfortunately there's a lot of people who never question stuff and will immediately buy an intake but won't scientifically test it for themselves to prove that it's providing performance gains. Similar to a lot of people already stating they want "upgraded" intercooler piping and other parts primarily because that's what other people/cars do and not because testing has shown there will be gains on the Cobalt.
alot of ppl arents worried about gains... most just want to hear the BOV lol
Man, just find the sound on the internet, download it for free and play it on your ipod if you need to hear it so bad! LMFAO
A proper intake tube will without a doubt increase turbo spool response. While peak torque won't change the curve will. I know as my car has a cai on it and it works period.
I've run a 13.84 with it and nothing else because the car pulls harder at the bottom of every gear.
I've run a 13.84 with it and nothing else because the car pulls harder at the bottom of every gear.
A proper intake tube will without a doubt increase turbo spool response. While peak torque won't change the curve will. I know as my car has a cai on it and it works period.
I've run a 13.84 with it and nothing else because the car pulls harder at the bottom of every gear.
I've run a 13.84 with it and nothing else because the car pulls harder at the bottom of every gear.
yep I ran a 13.99 the first time we went to the track but had the stumble issues like you have been experiencing and really lousy 60 footers.(like 2.70's) Move the MAF and on torco blue fuel at 1/4 tank of fuel ran 13.84. (with a moderate burnout) But that was really hard to get. The traction at Milan was off the hook even on stock tires. 60 footer at 2.34 on that run
yep I ran a 13.99 the first time we went to the track but had the stumble issues like you have been experiencing and really lousy 60 footers.(like 2.70's) Move the MAF and on torco blue fuel at 1/4 tank of fuel ran 13.84. (with a moderate burnout) But that was really hard to get. The traction at Milan was off the hook even on stock tires. 60 footer at 2.34 on that run
i have a cobalt ss/tc and i bought intake piping and cuplings and made a cai and its been a while and still boostin anout 20 psi you have to get the maf in the right angle and distance from turbo and you will be fine...
Alright so I made a custom Injen intake made for the S/C it seems to work but it bogs just driving normal if I put the clutch down to go into neutral and about 25 mph or higher costing it seems to kill the engine but then I shift back into gear and yah know it jump starts heh anyways im just wandering is that the pcu trying to get used to it will that go away cause it already seems like its getting better btw the blow off sounds nasty
it gets like one pound of boost its a shortram
08 T/C Sunroof/Highwing/Lsd Victory Red
Custom shortram Injen intake?/Stockmuffler delete->Bullet Muffler
http://i35.tinypic.com/6yh9jc.jpg Tell me if its done right but like i said thats what it does for now I just put it on 2 am this morning after i got off work heh
it gets like one pound of boost its a shortram08 T/C Sunroof/Highwing/Lsd Victory Red
Custom shortram Injen intake?/Stockmuffler delete->Bullet Muffler
http://i35.tinypic.com/6yh9jc.jpg Tell me if its done right but like i said thats what it does for now I just put it on 2 am this morning after i got off work heh
"update" ive been fighting this thing now for days. ive done the 6" from the stock position, but after a couple runs it kills amost all the boost and when it wants throws like 17 to 19 psi at me! im not dumb with cars, just never had one that hates mods so much!
seems like until you do a tune, this is a wasted mod... not only that, could it be hurting performance? I wonder if the ecm is retarding the timing, etc.???
i'd like to see some scans of stock vs. with an intake after the ecm has "learned" to kill the boost
I know I won't be doing a CAI until I get some type of tuning done, whether that be with the upcoming GM kit or with a handheld tuner... we don't really know what GM is going to offer, so I guess i'll wait and see...
i'd like to see some scans of stock vs. with an intake after the ecm has "learned" to kill the boost
I know I won't be doing a CAI until I get some type of tuning done, whether that be with the upcoming GM kit or with a handheld tuner... we don't really know what GM is going to offer, so I guess i'll wait and see...
When I originally did the CAI (in the fender) with the maf in the stock location, I saw my long term fuel trims go to -25 or lower before going into safe boost mode. I found out later that was because I had a crack in the endtank of the intercooler. Once I got that fixed, I tried the maf further away from the engine, and I see LTFT vary between +7 and -6 or so. IAT2s are still about what they were stock, no real improvement because the stock filter pulls air from the same spot. I have not tried the short ram test to see if the IAT2's would be higher or lower - perhaps that would be a good test for this weekend? it wouldnt take me long to convert from one to the other and back again.
What numbers do you all want to see if I do that? (other than HP, Im not spending a lot of money on dyno runs just for the hell of it lol). IAT, IAT2, Long term fuel trims, timing, etc?
What numbers do you all want to see if I do that? (other than HP, Im not spending a lot of money on dyno runs just for the hell of it lol). IAT, IAT2, Long term fuel trims, timing, etc?
Is it fast
Don't sweat it bro. I checked my car yesterday and the fuel trims are on the money. I checked for leaks per your PM Its all good. 6 in down is the ticket.
09 ss
If you have issues 6 in down you have a leak.
Don't sweat it bro. I checked my car yesterday and the fuel trims are on the money. I checked for leaks per your PM Its all good. 6 in down is the ticket.
09 ss
If you have issues 6 in down you have a leak.
Last edited by Gettinausernamesucks; Sep 18, 2008 at 01:49 PM. Reason: Automerged Doublepost
"update" actually went out and put out a lil money and got metal tubes. made a real CAI i had to make a new nipple too cuz mine snapped. cheap plastic! anywho, i ran great for a min then pooped out. i think the hole for the nipple i plugged up got unplugged. i fixed it just a minute ago. ill put pics up soon. i also rerouted the nipple, so i still have one.
p.s. - this time it looks pretty sweet!
ok, found out from taking my custom MAF adapter that it was leaking air. after making a new and better one, it works! i'm still pushing around the same psi, but it responds better, and has a sweet sound! i only paid like 40 $ for the tubing at autozone. ill make a DIY if anyone is curious.
p.s. - this time it looks pretty sweet!
ok, found out from taking my custom MAF adapter that it was leaking air. after making a new and better one, it works! i'm still pushing around the same psi, but it responds better, and has a sweet sound! i only paid like 40 $ for the tubing at autozone. ill make a DIY if anyone is curious.
Last edited by 09BlackSS; Sep 19, 2008 at 12:47 AM. Reason: Automerged Doublepost


