SGOS's - L99 A6 Dyno results (after dyno tune)

[SGOS252382]

Just got back from getting my car dyno tuned. I've been trying to upload the dyno sheet, but its just not compatable with my computer programs on my laptop. So this is the best I can do. I took a pic with my camara (sorry for the poor quality of the pic). The a/f is cut off, but it was unreadable anyways with dyno information printed over it (on the printed sheet). But Jeremy said he left the a/f at 12:1 with the tune. My car was "off the chart" rich in stock form.





By the way my car is 100% bone stock

If you can't read the chart here's the info.

Dyno run 1 - Run conditions: 94.89 degrees, 30.12 in-hg, SEA: 1.01
Dyno run 4 - Run conditons: 99.89 degrees, 30.12 in -hg, SEA: 1.01

Dyno run 1 - Max Power = 319.84 Max Torque = 313.77
Dyno run 4 - Max Power = 330.54 Max Torque = 338.78
It was very hot and humid (note the temp on the dyno runs), but I'm very pleased with the results. The best part is the transmission tune. That along with the extra hp and tq have completely changed the way the car feels.

My car was tuned by Jeremy Formato (fasterproms.net). He's a great guy and extemely knowledgeable.

[PQ]

Originally Posted by SGOS252382

Just got back from getting my car dyno tuned. I've been trying to upload the dyno sheet, but its just not compatable with my computer programs on my laptop. So here's the info

Dyno run 1 - Run conditions: 94.89 degrees, 30.12 in-hg, SEA: 1.01
Dyno run 4 - Run conditons: 99.89 degrees, 30.12 in -hg, SEA: 101

Dyno run 1 - Max Power = 319.84 Max Torque = 313.77
Dyno run 4 - Max Power = 330.54 Max Torque = 338.78

It was very hot and humid (note the temp on the dyno runs), but I'm very pleased with the results. The best part is the transmission tune. That along with the extra hp and tq have completely changed the way the car feels.

My car was tuned by Jeremy Formato (fasterproms.com). He's a great guy and extemely knowledgeable.

Cool. How does it drive? Noticeable differance?

Did you do any times testing before?
After?

[69Bird]

I am assuming dyno run 1 was before the tune? The one thing everyone agrees on is the factory trans tuning is horrid. Glad to see one of the L99's running good. How many miles are on it?

[SGOS252382]

My car only has 700 miles on it.

Yes, first run was stock (also I drove 120 miles to get to the dyno in 90 degree heat).

Yes, my car feels completely different. It feels much faster and pulls a lot harder from every speed. It even pulls a lot harder from, 1/4, 1/2 throttle, etc. Jeremy estimates it should run a good .4-.5 tenth faster in a 1/4 mile. A lot of that is from the tranny tune and reducing some of the torque managment.

[SGOS252382]

Originally Posted by 69Bird

I am assuming dyno run 1 was before the tune? The one thing everyone agrees on is the factory trans tuning is horrid. Glad to see one of the L99's running good. How many miles are on it?

Jeremy said the stock tune was crazy rich ("off his chart"). I believe he left it somewhere near a A/F of 12:1 if I can remember correctly.
He said if I had a few mods (intake, exhaust) he could lean it out more, but he wanted to leave it with a conservative tune because its still stock and has low miles.

[PQ]

Originally Posted by SGOS252382

My car only has 700 miles on it.

Yes, first run was stock (also I drove 120 miles to get to the dyno in 90 degree heat).

Yes, my car feels completely different. It feels much faster and pulls a lot harder from every speed. It even pulls a lot harder from, 1/4, 1/2 throttle, etc. Jeremy estimates it should run a good .4-.5 tenth faster in a 1/4 mile. A lot of that is from the tranny tune and reducing some of the torque managment.

So you're not concerned about warranty issues?

Truth is, and I told Scott this, I'll probably get mine tuned and say to hell with the warranty. If I have problems down the road then it'll just be time for some serious mods.

[PQ]

Originally Posted by SGOS252382

Jeremy said the stock tune was crazy rich ("off his chart"). I believe he left it somewhere near a A/F of 12:1 if I can remember correctly.
He said if I had a few mods (intake, exhaust) he could lean it out more, but he wanted to leave it with a conservative tune because its still stock and has low miles.

So as Spike said, GM wants these to run super rich.

Guess my dyno was acurate. That's like the third or fourth tuner to say this.

[SGOS252382]

Originally Posted by irpq11

So as Spike said, GM wants these to run super rich.

Guess my dyno was acurate. That's like the third or fourth tuner to say this.

He dynoed another L99 a couple days ago, and I believe it made 316 rwhp. He said it dynoed pretty similar to mine.

Super rich is an understatement. He literally said my car was so rich it was off his a/f chart (couldn't read it).

No, not too concerned with my warranty. I'm also planning on getting long tube headers and high flow cats sometime in the near future. I'll need to go back and get my car re-tuned for that.

I'm telling you if you felt the difference in performance with the increased torque and reduction in torque management you'd be sold on getting your car tuned.

[PQ]

Originally Posted by SGOS252382

He dynoed another L99 a couple days ago, and I believe it made 316 rwhp. He said it dynoed pretty similar to mine.

Super rich is an understatement. He literally said my car was so rich it was off his a/f chart (couldn't read it).

No, not too concerned with my warranty. I'm also planning on getting long tube headers and high flow cats sometime in the near future. I'll need to go back and get my car re-tuned for that.

I'm telling you if you felt the difference in performance with the increased torque and reduction in torque management you'd be sold on getting your car tuned.

I may allready be sold. My mixture also dropped of the chart once.

[mlee]

Good deal!!!! Glad to hear it worked out well.... Did Jeremy say anything about AFM... did he reduce or get rid of that altogether?

[SGOS252382]

Originally Posted by mlee

Good deal!!!! Glad to hear it worked out well.... Did Jeremy say anything about AFM... did he reduce or get rid of that altogether?

No, as far as I know he didn't mess with the AFM.

[Verio]

Is there a reason these cars run so rich? What is the benefit? I know GM Engineers probably have their reasoning...but 70 HP lower than at the fly wheel because of such a rich A/F ratio bothers me.

[rodimus prime]

yeah, its because they ****ed up on the tuning somewhere. Mine is pig rich as well. Im getting it tuned when I get a CAI. If something breaks, Ill fork for a spare cpu with a stock tune.

[CamaroSpike23]

Originally Posted by Verio

Is there a reason these cars run so rich? What is the benefit? I know GM Engineers probably have their reasoning...but 70 HP lower than at the fly wheel because of such a rich A/F ratio bothers me.

its safer to run a car too rich than to run it too lean. id like to see a stock L99 with a CAI's dyno sheet... just to check some things.

[rodimus prime]

There is a difference between a safe tune and a power robbing tune.

[silverfox]

OK guys i'm having a procharger sc and arh full system but keeping the stock mufflers installed at dtp racing next week. I will post dyno charts and numbers after.

[SGOS252382]

Originally Posted by Verio

Is there a reason these cars run so rich? What is the benefit? I know GM Engineers probably have their reasoning...but 70 HP lower than at the fly wheel because of such a rich A/F ratio bothers me.

You should try 95hp lower. Lots of guys are dynoing in the
305 rwhp range. If you get an L99 that's dynoing around 320 rwhp, you should consider yourself lucky. Around 320 - 330 rwhp is where a 400hp automatic should be dynoing.

Automatics (hp) are usually calculated at a .20 loss.

[SGOS252382]

Originally Posted by silverfox

OK guys i'm having a procharger sc and arh full system but keeping the stock mufflers installed at dtp racing next week. I will post dyno charts and numbers after.

It should make a ton of power. Jeremy said with just exhaust and tuning I'd probably see 50hp.

And Prochargers make big HP.

[camaro5]

AFR
The Air fuel ratio is the most common reference term used for mixtures in internal combustion engines. It is the ratio between the mass of air and the mass of fuel in the fuel-air mix at any given moment.

For pure octaneOctane
Octane is a straight-chain alkane with the chemical formula CH36CH3.Octane has 18 structural isomers:* Octane ...
the stoichiometric mixture is approximately 14.7:1 or of 1.00 exactly.

In Naturally Aspirated engines powered by octane, maximum power is frequently reached at AFRs ranging from 12.5 - 13.3:1 or of 0.85 - 0.901.

[bobby35ny]

FYI, Disclaimer of course.
They make undetectable tunes ya know.

-bobby

[69Bird]

It just doesnt make sense that GM would do this.
#1. killing power.
#2. wasting fuel/fuel economy. (not to mention emmisions being higher)
They have to know it's a jacked up tune, they need to fix it so people with the A6 can keep their warranties intact.

Just my .02 cents

[1camaro70]

also Brian Herter, pcmforless.com, I know he travels, L99 327 HP, 342 Torque up from 305/300.
HP was as high as 332 on last run, but torque was a little lower.
Air fuel stock was 11 to 1, tuned 13 to 1.

[rpepka]

It sounds like GM needs to reflash most all of the L99 computers

[redjewel]

Originally Posted by rpepka

It sounds like GM needs to reflash most all of the L99 computers

I might be interested in an undectable tune though. I just don't know how true they are to undetectable.

[PQ]

Originally Posted by bobby35ny

FYI, Disclaimer of course.
They make undetectable tunes ya know.

-bobby