TicketBait

Yesterday I attended A & A Engines BBQ party and got a free dyno (two pulls.) Thanks Andy !!



Thats right 471 rwhp 446 rwtq No engine mods .
I do have an LGS exhaust bypass switch first pull was with it closed 470/442 2nd pull open as shown above.
Approx time was 11am
air temp approx 70 - 75 degrees
12,600 miles on car
vin # 00360 37th one built for retail

I am one happy camper !!




And to John who volunteered and worked his butt off White T=shirt & sun glasses
















Thanks again to the hard working crew at A&A

Cobra4B

Awesome dyno numbers... that party looked like it was a blast!

Dicecal

Very nice numbers for stock. 93 Octane? No ECM tuning? Going to baseline mine tomorrow, but with temps in the 110's already (AZ) I'm sure I won't see anything like that.

FikseGTS

great numbers.... what did it make before the exhaust bypass?

post up the sheet here if you have a chance:

http://www.dragtimes.com/Chevrolet--...no-Sheets.html

starting a collection of corvette dyno graphs....

TicketBait

This was my first dyno ever on this car.
I did the by pass switch for sound
Maybe it was because the wheels were chrome that the car decided she needed to be fast

91 Octane, no tuning yet !

My first pull was 470 rwhp and 442 rwtq with the exhaust by pass in the closed position.
However that brings up a question since it (butterfly valves) is suppose to open up when it reaches 3500 rpm, is it still opening up with the by pass switch in the closed position. If it is still opening up then the only variance of one hp is mute, as in no difference

RADAR B8

[QUOTE=FikseGTS]great numbers.... what did it make before the exhaust bypass?

The bypass switch can only be tested under 3,500 rpm and not WOT because the computer will open the exhaust at 3,500 rpm.

When my Z was on the dyno they tested the difference under 3,500 rpm and it made 8 hp more when opened under 3.500 rpm.

The bypass switch will give you the same hp gains that a $2,000 after market exhaust will give you. Only the sound will be different.

Mike

Dicecal

[QUOTE=4enjoyn]Agreed! Adding headers to a stock Z06 is not worth the money! In competion mode, the exhaust valves will open at 3000 RPM.

allanlaw

You should see a larger difference just below 3500, maybe closer to 5-8 hp. Then the valves open and there is no real difference. See if you can line up your two charts and check it out.

RADAR B8

[QUOTE=Dicecal]Thanks I did not know that they open at 3,000 in comp mode. I had headers installed on my Z and the hp and torque gains are noiticeable, it's the after market mufflers that will not give you any hp gain over stock, just a different sound.

Mike

Dicecal

[QUOTE=4enjoyn]I have not added headers or tuning yet....But from what I have seen, the big gains come from the tuning. On a stock Z06, again from what I've seen, LT headers are only getting in the 12 RWHP/TQ range. When adding LT headers, the car is usally tuned at the same time...thus masking the gains from just the headers. I may have the car tuned first, and see for myself before I consider headers. Right now I'm pretty happy with the way the car is stock. Do you have numbers on your car with just tuning? Then with headers and tuning? Not throwing stones, just trying to make a smart choice with my limited resources!

hardhattg

Was the hood left up during Dyno run ? information from this forum seems to indicate + 25 - 30 h.p. if hood is left open .

beautiful car good luck with it

90droptopp

That car is very strong! 470 to the tire on a stock car...... awesome. Great interior I might add!!

And yes, the hood was open during the dyno run.

WeaponsGradeTorque

[QUOTE=Dicecal]
I can also verify this is correct.

Lankhoss

I think it's hard to put a simple number down for the gains you get with headers. You may only be seeing a 12rwhp difference between a tune and tune w/headers, but the engine is breathing much better with the bigger headers, keeping the cabin area cooler from what I've heard, giving better gas mileage, and (probably most importantly) will allow for greater gains with other internal mods such as a cam and/or head work.

I think the better comparison would be to add a cam only to the car, then add the headers and see what the HP difference is.

Just my opinion though.

RADAR B8

[QUOTE=Dicecal]
My Z has not been tuned, I do not have any tuners in my area so it will be long drive and time off to go to a turner. I will at some time find a turner because your right, the big hp gains will come from tuning. I do believe that with tuning, headers and a better air intake we can have 500+ RWHP.
My Z is being used by one of the header manufactures to design their headers for the Z06. At this time they do have the system ready to release for retail sale so I cannot release any data at this time. However the gains are in line with the other makers of headers, what I like best about these headers is the low to mid range torque gains.
I would spend my money on headers, tuning, and air intake before I spend $2,000 on just mufflers to get any real hp and torque gains


Mike

Dicecal

[QUOTE=4enjoyn]Mike,

Great, thanks for your input. Please keep us informed of the new headers when they hit the market. I'm considering a mail order Halltech tune, since my car is stock and I don't trust any of the Phoenix area tuners to do the LS7 right. Cheers!

TicketBait

You gotta be kiddin, there was another c6 ZO6 that pulled like a 430 ish trom the same dyno an hour later with the hood up. So are you sayin

lowellmstevens

good numbers! j/c what did Andy's z06 with the g7x4 put down?(if it was dynoed at all)

Brabus2

Steve...CONGRATS!!! Those numbers are STOUT... Your bone stock C6 Z06 results are the highest I've seen at Andy's dyno, and I've seen at least a dozen of other C6Zs run that dyno...lowest was 411rwhp. And, yes folks there was a red C6Z that ran 430rwhp (hood open) an hour later.

WeaponsGradeTorque

Man,
That is really strange. I would like to really understand this. What was the difference in mileage between the two cars? Did both also take off the valve covers during the dyno run? Did they have the same exact loading on the dyno? What was the tire pressure on both cars? I've seen a car dyno 40 rwhp differenct with incorrect tire pressure. Is one car potentially running lean up top? I find it really hard to believe GM could have an 8-9% power difference in numbers from the factory. 1% I beleive, but that is about it. I would also be curious if either of these cars were run at the track yet?