110 degree ambient temps, and head soak was nasty up top, so keep that in mind...

Stock - 227 whp / 262 wtq (you can see the tq is there, but it's just too hot to hold it though the whole pull)

Tuned - 263 whp / ??? wtq (probably 290-300 range based numbers from other cars, but I won't know for sure till I get the file in my e-mail)

Without this nasty heatsoaking weather, I would estimate 240-ish whp stock, and probably 275+ on the tune. I will be doing this again in a couple months to get numbers from 70-80 degree temps instead of 110+...until then, you can still see a pretty solid increase from just a tune!

Also on the dyno was a Sky Redline with an intake. Good lord, what a difference in sound! Can't wait will I can grab one for this car...

 

nice numbers

 

Nice work there Stevo.

 

sweet

 

F-in A Tom! You put down 299.43 WHEEL TORQUE!

 

holy **** im jealous

 

All in all the wheel power gains were 41+whp and 52+wtq.

To the crank we were making 48 more hp and 101 more torque than the stock engine specs. That's if you count the 260 figures.

At the motor these cars are making 308/361 and that's on 91 octane and a tune with NO KNOCK in 111* temps in the shade. Actual temps on the asphalt were 135*+ yesterday when we did this. I could have advanced the timing more to allow the car to knock, but stock these cars knock about 4* on 91 octane. I could have also kept them lean (They run almost a 14:1 AFR at full boost, but I richened it down to a 12.8:1)

If you give me race gas and normal outdoor temperatures, Whoa Man I could make your day.


And to minimize confusion, GMRoadster is the E-magazine I write ECOtec articles for, and I do ALL of their tuning.


WE LOST THE DATA OF OUR 267WHP RUNS WHEN THE DYNO'S COMPUTER FROZE, so I will not claim those yet since i can't show you proof, but TOM can attest to it because it was on his car and he backed it up with a 263hp run right after with a little heat soak.


Here's the graph with max values:




And here's the graph to prove that we were doing this for real in 111*+ temperatures. It was hot as hell.......but 3% humidity "IT'S A DRY HEAT!"

 

wow i need tuned lol

 

Excellent job man! What psi is this boosting? 20? 21? More?

 

22-23 mostly 22.

I could have made WAY MORE hp if I ran a 14:1 AFR like GM did, but I'm not going to sleep at night if I did that.

 

very nice, maybe i will get the hhr on the dyno and see what its putting down after that flash.

 

Yea. I can't believe factory it runs that lean.

 

lean is mean boys wonder y it runs that lean though

 

It runs so lean you can smell Ammonia being produced by the exhaust! I think these cats are going to clog up or get a hole burnt right through them.

 

Holy hell! Any good places to read up on direct inj. tuning or why they went so lean? Forgive my ignorance, but I'm used to the traditional rule of thumb being 12:1 for f.i. and 12.8:1 for n.a.

 

Direct injection hombre. But it goes against everything you ever knew about tuning.

You are right, I like going UNDER 12:1 for FI.

 

That really is absurd. Wonder if they have all the LNF motors doing that?

 

Well considering I put 7 cars on the dyno yesterday and ALL were that way. Solstice, Sky, Cobalt.......

Yup, all LNF's do it.

 

hmm makes me think i should take the cat off then

 

man u gotta be making bank tuning

 

This is due to the design of the piston heads, and the way the fuel is injected. It is so finely atomized and injected at just the right point, that it forms a ball of fuel that doesn't actually touch the cylinder walls (no technical terms there). This allows a pocket of air to insulate the cylinder walls and piston which in turn allows a leaner (hotter) burn to occur without damaging either. Like psykostevo said, it goes against everything you have learned about tuning, it is fairly safe to run these engines near 14.0 (wow..!) at WOT, even being FI...although you won't catch me being the first one running a tune that (comparably) lean , even though GM did it from the factory. My first dyno run was showing 14.7 all the way up to about 5krpm, when it richened up to a whopping 13.9 to redline - the dyno operator was actually a bit worried, this being the first DI car he ran on his dyno.

Even running at 14.7 stock, the cat temperatures usually sit around 1100 deg F, and under hard/prolonged acceleration, the temps can rise to about 1400-1500deg F. *note this is not EG temps, just the cat itself.

 

That depends on how you see it. I have 1 car to tune today, 8 next saturday. 10-12 on the 13th of September, 15+ on the 20th of September and 10+ on the last saturday of September.

If I wasn't tuning under the auspice of GMRoadster I would be racking it in, but I split profits with them because they advertise and schedule for me. So I bring home $125-$300 per hour. If I could stay this busy all the time......I'd tell my day job to go F themselves. But I don't want to jump the gun.

I don't know how you rank it, but at the moment I am probably one of the most sought after tuners in the country. If I wasn't paying someone to answer the phone for me I'd have no time to do anything.

And aluminum melts around 1,500* LOL!

Look what I get to test out this week. I've got this and a set of powder coated DEJON chargepipes.Pipes are still wrapped to protect them from scratches so no pics of those yet. I only peeled back the wrapping to inspect the color. Went with an Anodized red.

 

wow u got the intercooler + piping to test thats awesome

 

It ain't free, that's for sure. I know Bill pretty well, but not well enough for him to dig into his own pocket. And I don't blame him. But there it is, it's going on this week. I'm hoping that the charge piping will greatly improve the Solstice/Sky, because they have the worst bends. The bend over the radiator looks like someone put a pipe over a cinder block wall and bent it.

Here's a rearwheel HP graph from a Solstice (More powertrain loss). Look at dem gains! This is tune only. Talk amongst yourselves.

 

pure aluminum melts at 1225 degree's.

give or take 10 degree's