irpq11, L99 Dyno results.

[PQ]

Ok fellas. Here are the results from my Dyno this morning.

The tuner was particularly puzzled by the fuel mixture running so rich to abnormal levels. He seemed pretty concerned. Said it may be causing HP loss.

EDIT: Turns out he was exactly right. The fuse pull solved the problem.

[jdanza]

Are the HP and torque #'s where they are supposed to be ?

[9c1ny]

seems to be pretty normal for the HP #'s

[MTron]

they do seem a touch low. Could indicated a program issue.

I think the more significant thing here, is that if there is a programming issue, it could also affect the way the transmission shifts, as well as the torque management, thus further compounding the issue

[GTAHVIT]

What else did he say??? was he happy with the HP numbers? Or did he think it was under powered?

I'm sure I should know this... but what should it be at the rear wheels?

[PQ]

Originally Posted by jdanza

Are the HP and torque #'s where they are supposed to be ?

Originally Posted by GTAHVIT

What else did he say??? was he happy with the HP numbers? Or did he think it was under powered?

I'm sure I should know this... but what should it be at the rear wheels?

He said that in his opinion, this car should be losing no more than 15% from crank to wheels. He thinks the rich fuel mixture is causing a loss. In his opinion it should be getting 330 HP to the wheels. He says this car should be tighter than that.

[JDBeck23]

What caused the 20 hp jump from first to third dyno pulls?

Seems low to me, I would take the first dyno run into the dealer and put up the big WTF?!

[Xanthos]

They should be able 320 at the rear wheels, but that A/F ratio looks a bit weird to me as well... That could quite possibly be messing with your numbers. Of course, it could be something else as well.
- X

[MTron]

actually, on further inspection, those seem very wonky...

i mean run 1, the torque and hp curves are nearly idenicel.....very strange....as well the A/F graph is messed...took a major plunge at 4.5 k rpm to 10:1....NOT normal and 200lb feet of torque at 4000 rpm...i mean....wow...not normal

run 2 you A:F is low, and your torque is taking a dive, but more normal then the first


run 3, same issues as 1, A/F dive at 4k rpm torque too low for the rpm at 4000

[matt55]

Wow rich in the mid , I wonder if the WBO2 is off ?

[ElAntonius]

They seem in line with the lower side of what most people are pulling in on the L99 (which seems to range about 310-330 depending on the dyno and other factors)

I wouldn't say that kind of dyno pull would be indicative of a car that is losing 1.5-2 seconds to 60.

Edit: I mean the actual HP numbers. Analysis of the A/F mixture and curves is beyond my ability.

[1320junkie]

Yeah man its a tad bit off..2nd and 3rd would be acceptable but your a/f is kinda wacked...wth happened with the 1st run?

[D1BADZ]

hmmm, interesting, thanks for posting this up

[ElAntonius]

Looking at the low starting torque on run 1, I wonder...

irpq, you've said that you randomly had the car 'wake up' the other day, though it seems intermittent?

I've been thinking about my theory that the car doesn't respond as well to mashing the throttle from the get-go...all my best launches have been in situations where I smoothly feed the throttle in and I've had some disappointing launches where I rammed it...is it possible that some aspect of the L99 software is limiting maximum torque from a dead stop? Perhaps some sort of break-in software?

[Xanthos]

Originally Posted by ElAntonius

They seem in line with the lower side of what most people are pulling in on the L99 (which seems to range about 310-330 depending on the dyno and other factors)

I wouldn't say that kind of dyno pull would be indicative of a car that is losing 1.5-2 seconds to 60.

Edit: I mean the actual HP numbers. Analysis of the A/F mixture and curves is beyond my ability.

Even if his peak numbers are looking okay, he's lost a LOT of power under the curve for the first half of the rev band. That makes a big difference in acceleration, particularly in first gear.
- X

[Crowley]

It does look a bit weird. Was there any tuning done from the 1st pull to the 3rd pull? If not, the first one may just be an anomally. Taking a look at my stock dyno (Manual though), my A/F doesn't go below 11.4 and not above 11.9 stock. I wonder if the A/F ratio is the norm for the automatic cars.

I do think that the 15% loss your dyno guy said is a bit optomistic though as it seems the norm for the manual cars is 15 - 16 % .. IF an auto is 17% that would put you around 330 hp at the wheels if it is a little more than 17% then it would be a bit lower. Yours appears to be around 21 - 22 % though ..

Keep us posted.

Crowley

[themossman]

Different dynos and other considerations...but I was really surprised by the #'s...

here's my 'stock' dyno...keep in mind mine is the LS3, but I still wouldn't expect at 70+hp variance....

[PQ]

Originally Posted by JDBeck23

What caused the 20 hp jump from first to third dyno pulls?

Seems low to me, I would take the first dyno run into the dealer and put up the big WTF?!

Originally Posted by 1320junkie

Yeah man its a tad bit off..2nd and 3rd would be acceptable but your a/f is kinda wacked...wth happened with the 1st run?

1st run he said was him. He said a Standard is easier to do because of 4th gear in the auto is best gear or something like that. But in the standard it's more consistant........... hell I can't remember.

[Rogue Leader]

Originally Posted by themossman

Different dynos and other considerations...but I was really surprised by the #'s...

here's my 'stock' dyno...keep in mind mine is the LS3, but I still wouldn't expect at 70+hp variance....

Wow thats a tremendous difference. Even if you subtract 26 HP to make up for the rating of 436 vs 400 youd get 356 HP, then a few % points for the AT, maybe 340.... Id assume the 26hp difference covers the fact the cam is less agressive....

I agree with MTron that if the power is dragging it could possibly affect how the transmission is operating as well and compound the issue.

[gpr]

You need to have someone who has dyno'd a stock automatic camaro look at that and compare to what they have seen. I have done lots of dyno pulls but not a camaro so not sure how they react. The a/f does seem very rich but i have heard from the factory they are down in the high 11 range. Also how did they dyno the car? lock it in one gear hopefully, and the same gear for each pull.

I wouldn't worry about the numbers being low or high, but the big difference in numbers from the first to the second is bothersome. They should be fairly consistent, but if i had to guess something is going on making it run pig rich. This also can have adverse affects as one run it will run properly then the next poorly as you got beat by a v6. Also a dyno only shows what the engine is doing. The tranny could be reading something funny as well causing it to be slow. A scan tool while making these runs is necessary to see what is all going on at WOT. A very experienced tuner could help you track these issues down. I would suggest someone that does a lot of corvette tuning could log dyno run's, or runs on the street for you and give you a much better idea of what is going on.

[GTAHVIT]

Watching very closely....



I wonder if the dealer could interpret the A/F numbers for us?

[Hylton]

97 degrees outside and 37% humidity? Have you considered fish gills? Your dyno numbers are fine.

[Crowley]

Originally Posted by Hylton

97 degrees outside and 37% humidity? Have you considered fish gills? Your dyno numbers are fine.

Just noticed that it showed the STD numbers.

irpq11 do you have access to the SAE numbers? It is a little easier to compare across different dynos (although still shouldn't be comparied). SAE numbers should correct to a higher number.

THanks,
Crowley

[KK2010SS]

I am going out on a limb here but I think there might be a problem with the stock air filter. It’s a little late now, but it would have been interesting to see if removing the air filter made any difference on the dyno. Maybe it’s running rich because it can’t pull enough air. SilverTurtle and I tested the stock 2010 Camaro Fram filter with an air compressor and it flowed less air than his DIRTY Fram filter from a 2002 LS1. This would affect the A6 cars more because of less direct control over RPM’s… Just a thought.

[PQ]

Originally Posted by JDBeck23

What caused the 20 hp jump from first to third dyno pulls?

Seems low to me, I would take the first dyno run into the dealer and put up the big WTF?!

Originally Posted by gpr

You need to have someone who has dyno'd a stock automatic camaro look at that and compare to what they have seen. I have done lots of dyno pulls but not a camaro so not sure how they react. The a/f does seem very rich but i have heard from the factory they are down in the high 11 range. Also how did they dyno the car? lock it in one gear hopefully, and the same gear for each pull.

I wouldn't worry about the numbers being low or high, but the big difference in numbers from the first to the second is bothersome. They should be fairly consistent, but if i had to guess something is going on making it run pig rich. This also can have adverse affects as one run it will run properly then the next poorly as you got beat by a v6. Also a dyno only shows what the engine is doing. The tranny could be reading something funny as well causing it to be slow. A scan tool while making these runs is necessary to see what is all going on at WOT. A very experienced tuner could help you track these issues down. I would suggest someone that does a lot of corvette tuning could log dyno run's, or runs on the street for you and give you a much better idea of what is going on.

This is a brand new car under warranty. I sure hate having to deal with this.

Originally Posted by GTAHVIT

Watching very closely....



I wonder if the dealer could interpret the A/F numbers for us?

I've pretty much blew my wad as far as time to run around. I'm in doo doo now for being gone yesterday for a while and all this morning.

Originally Posted by Hylton

97 degrees outside and 37% humidity? Have you considered fish gills? Your dyno numbers are fine.

What about the fuel mixture. It dipped BELOW 10 at one point.

Originally Posted by Crowley

Just noticed that it showed the STD numbers.

irpq11 do you have access to the SAE numbers? It is a little easier to compare across different dynos (although still shouldn't be comparied). SAE numbers should correct to a higher number.

THanks,
Crowley

My car has an STD?

Don't know what SAE numbers are.