for those of you with a straight up GM stg1 from the dealer, how are the mods youve done reacting with the car?
list youre mods, and how you liked them
thanks!

 

Well I have the GMS1..

Mods: Catless Downpipe from Clear Image Automotive (FTW) and a simple K&N drop in...that's it...

Evaluation: I love it. Downpipe and the GM tune go together really well in my opinion, definitely the best horsepower for the money...and it makes a pretty big difference too. My best time so far is 13.5 in the 1/4 mile in 30 degree (Faren.) weather on all season tires at 25 psi, best 60' is terrible (2.2). Totally worth keeping the warranty.

 

Its true, I saw him run the 13.5 sec 1/4 mile.

I ran as well, I got one run in that day. I have the CIA Downpipe and a simple K&N drop in as well. 09' yellow SS sedan.

I ran a 14.2 at 102mph roughly. GmS1 makes a 0.7 sec difference in 1/4 mile times by this evaluation.

 

I have a stage 1 and k&n, and injen charge piping with a hahn catted downpipe waiting to be installed. cant wait, sounds like a down pipe really helps out.

 

I have the mods in my sig, the car runs great, much faster then stock, but I havent had a chance to take it to the track since I have done the mods, but stock I ran a 13.9 so I'm hopeful...

Hahn Catted DownPipe is the only mod I have done since I got the install of my stage 1, and all I can say is holy **** lol, it makes a huge difference, I think you will be very happy.

 

Dont forget to consider there was two different drivers.

Dont get me wrong, I love my GMS1, but you cant really make a statement like that. Had it been the same driver running consistant times in both cars that'd be another story...

 

It all depends on the track and the driver

My best time with GMS1 was 13.8 at 106 with a 2.2 60'

My local track is a 1% uphill grade

 

well a 13.5 isn't too much of an increase from my best stock run (13.67) but I can tell you from the videos I have, with some better tires I'll be knocking on 13.0's door with this setup.

 

mods are in the sig best time stock was a 14.07 at san antonio, tx dunno any info about the track

havent been back to the track since any modifications, feels like an entirely different car though

 

thanks guys! not sure what i want to do about a tune so thought id ask

 

well as long as you don't mind spending the extra cash to keep your warranty I totally recommend the GMS1, my plan is to get a real tune after my warranty is up. I can't decide if I should wait just til bumper to bumper is over, or powertrain. Either way.

 

13.2 104 2.0 60ft with a zzp down pipe and the gmupgrade and a k&n drop in on radials. put on injen charge pipes and aem intake no further tuning and picked up some mph but the track wasnt prepped as well that day 2.17 60 foot. mph was 107 and a 13.3.
Its was plenty quick for all seasons I thought. all aftermarket parts removed cept the gm kit and the drop in and have not been back to the track.
Josh

 

Make sure to post after you go again.... Im curious to hear what i does with no bolt ons and just the GMS1 after seeing the numbers with the bolt ons.

 

Mod's listed in sig.Very happy with stage 1 upgrade.I will be getting it tuned over when warranty is over and I can get a larger turbo kit.

 

80vette The real question is whats the vet doing. Will let you all know how it does if it take it back out.
Josh

 

Get a good custom tune. I went 13.5 with just an hp tune.

 

you can mod the car till you're blue in the face. doesn't matter. a gms1 car box stock is FASTER than your modded one. you are still limited by the ecm and the calibration itself. gms1 + tune. THEN mod the car.
once you get past the torque management nannies in the ecm. your mods will show the power gains. not till then.

learn this.

 

GMS1 with 25 psi????? I'm only 20 and i think thats what they claim to gain as well. I guess your temp and altitude make it do that?

 

so its just the calibration because its tuned for factory parts? cuz the gms1 gets rid of learn down right?
very good to know. thanks!

 

Kildore, 25 psi in the tires.

 

lol thats a good question....Im still waiting to fire the motor for the first time in the car. I ran into a manufacturing error with my driver's side side mount header. One of the primaries was welded wrong and is hitting my steering box preventing me from installing it. A replacement is 40days out so Im going to have to modify this one in the mean time. Other than that I just have to fab some tranny cooler lines and Im done.

At this point I dont know what to expect this thing to run seeing Im only going to be able to run it on street tires in hopes of keeping the rear in one piece... as long as the rear end stays together for a little while, Ill be happy Eventually I want to swap to one of the older, stronger iron Vette differentials and then start running slicks.

 

no it doesn't actually get rid of the learn down it just raises it higher then what stock setting is. theres been talk time and time again about it and no one really seems to agree but moajority will say its still there. i plan on getting the stage 1 for now leaving it stock then when i save the money im going to stack a custom tune on top of it and add things like intake and hot cold pipes and dp.

 

thats what im thinking im going to do. im getting antzzy and i wanna keep the warranty lol.

 

well I haven't had the time to sit down and search, but on GMTunerSource, I'm pretty sure it's in one of the Q&A's with John Heinricy, but either way, it clearly states that Learn Down is disabled. I know this is basically a can of worms being opened up, but in support of learn down being gone, could an extra 20 hp and 60 lb-ft really take off a whole second of 1/4 mile time? probably not. Idk what recklessnova's best stock time was, but I'm willing to guess that it was right around a 14.0, and then running a 13.2 with the GMS1 and bolt-ons...I guess we will just wait and find out what he runs without bolt-ons.

 

you are still hindered by the desired air load tables. if the calc'd airflow is above this, it nukes the torque. pure and simple. so keep bolting on crap without a tune. don't say i didn't warn you when you got dyno your new found mods and find you make less torque than a stock lsj