He confirmed a 5 sec 60-100. @3000lbs, Car has to be close to 350WHP or 390+ Crank HP to accomplish that. Simple physics...F=MA.

 

GAH frustration is setting in. I have to go to the shop on Monday since they didn't email me my dyno graphs or video. Then off to the DMV while is kinda like getting your nuts run over by a caterpillar tractor here in California. Then home to post the graphs and videos. Sorry for the long wait gents I will get them up here as soon as possible.

 

Yep I told him it would make about 345 whp on a dynojet based on the 60-100 time. FF-ace runs 4.7-4.8 seconds and is over 350 whp.

 

Finally my dyno graph and video.

YouTube - 2010 Cobalt SS dyno run

 

What's that with the huge jump/spike?
Also you said 310 WHP..I see about 300 HP on that graph as well as about 355 Torque vs the 369 you indicated. Maybe this was from a different run?

 

The dyno printer was broken... Notice no peak hp or tq rpm and the guy had to print it on another computer so I didn't get any actual visible number on peak and at what RPM. I'm a little pissed and I want to try and go back to get the real dyno slips instead of this crap. The smudge is when it spiked to 360lbs torque. The dyno read that the peak was 369 ( i was standing next to it watching it) but the graph smudged cuz of the wheelspin and effed up my number.

The smudge is where the tires lost traction on the dyno in 3rd. It was strapped down as tight as it went but the damn fwd still yanked the tires up off the dyno drums.

 

Sounds like the shop didn't have it's SH$$T together at all

 

Did you get a clean run? This graph means nothing. Hope you didnt pay for that. Shop needs to learn how to strap down a car

 

I got a clean run but on the less aggressive tunes. The most powerful tune lost traction. I'm going to another shop next month just to make sure these numbers are accurate. I have a feeling that they are messed up. I was definitely not happy with the shop I used.

 

I thought it was clutch slip looking at the graph but watching the video it does appear that the tires are spinning especially runs 1 and 3. Run 1 He clearly did not know the car was going to hit that hard because he lost the steering wheel. Gotta love torque steer.

 

Yea when they were loading it up the guy was like "what is this a chevy?" How much are you expecting to lay down with this?" When I told them they didn't believe me. They were shocked when it ran.

 

They would have been even more shocked if it had a clean run (no tire or clutch slip) especially if you put some E-47 in the car.

 

Yea I know. Haha damn bmw tuner shop. Its only like 2 miles from my house though. It took them an hour to get it strapped down to the point you see in the video. And it still wasn't holding well enough... Haha beast fwd raping the dyno FTW!!!!

 

Thats how the shop owner reacted to mine(import oriented shop). I told him it should put down a little over 300. When it did 340/380 he was like

 

Yea the dude literally dropped his jaw open.

 

usually when the tires slip the revs go up, that sounds like it hit a plateau and then started going, sort of like the clutch finally grabbing and then going.

 

It was probably as much of a problem of torque steer as it was tires losing traction. Like I said this was the most powerful FWD car they ever had on their dyno and I don't think they were prepared for it.

 

do you not have lsd?

 

I didn't know where to start, intake or exhaust, but apparently GM was planning a Stage 2 kit (never released) which would have been a stage 1 kit with an intake fix added. Seems with the GMS1, the Cobalt makes 10 HP less than the HHR and the only diff is the intake. Details here.

 

I believe he does have an LSD.

 

Oh I do. But the power really gets you by surprise. Even when I'm fully prepared for the hit it still pretty gnarly.

 

I just got done tuning RYRO14 s car on E-85 and 93 octane mix and a combo tune. It is absolutely brutal, it hits so hard that the ESC kicks in in 3rd due to wheelspin and torque steer. 2nd gear spins hard to nearly 80 MPH. Measured 60-100 time of 4.5 seconds in 60* temps. He was running almost a full second slower before.

 

How was his trims with the intake? Were they way off before the tune?

 

They were off about the same as the K&N SRI mostly 3-4% but some areas 8-9%. He has VTA BOV which skews things a lot when it blows off.

 

Yea on one of the logs I just emailed you I had the same thing happen. There was a slight bend in the freeway and it was a little uphill. the ESC was flashing and cutting fuel and stuff and I'm sure you will see it when you look at the log. I wish I could do E-85. It is so scarce here. No one has it.