Anthony01

My car is a Linginfelter getting a S/C installed, and before they did the install they did a dyno pull. I was suprised when they told me it produced 315rwhp & 321rwtq.

Reason why, Its a A4 , and the only mods are Corsa X-pipe and Indys, Blackwing filter , a bigger air bridge, and finally the area around the fog lamps, I drilled some holes there before putting in the Z06 screens.

If you figure 20% drivetrain loss that makes it a 394hp at the crank.
I'm not complaining , but I seen the same set-up and get around 280-290rwhp. Are there that much difference in the LS1 motors. I can't believe these mods make that much difference

Ego-Trip

Bone stock A4 should be around 300-305 rwhp

With your mods, you should easily be around 315 rwhp. Actually, if anything, 315 rwhp sounds a little low.

Also, from what I have heard, A4 drive train loss is closer to 15% than it is to 20%.

G-lock

That's about right for your mods, driveline loss on an A4 is ussually figured as 18% with factory gearing. Jeff

I X L R 8

BS
bone stock around 285-295 in most all cases.
295 being the high end. If you ahve a bone stock a4 pushing 295 rwhp you have something unique.
Bone stock my pushed 293.
This is ALL subjective to the dyno used..........they dont all read the same.

Oh and for his mods............his rwhp doesnt sound a little low..........it sounds ALOT high

Ego-Trip

I dont suppose the fact that you have a 98 C5 that only came with 345 hp has anything to do with that, does it?????????

Gee....add the extra 5hp that the 2001+ C5's have and that would put you right around 297-298rwhp. And as you said, different dyno's get different readings. 300 rwhp for a new C5 is not unusual.

And how old was your car when you had it dyno'd and how many miles did it have on it? I dont know that putting a dyno on a 5-6 year old car will get you the same as a 1-2 year old car.

shurite44

I come up with about 380 crank using my little formula, I think you have a good runnig LS1 there.

Anthony01

I've seen some auto C5 on dynos this year and even w/ just mufflers they only made 280-290

Anthony01

i figured 394 crank w/ my "could never pass math class" calculation

WellAdjusted

Daym, Joe! Why don't you tell us how you really feel

I dyno'd 310rwhp bone stock but it was not SAE corrected. 70 degrees and had been driven hard for the 100 miles prior to the dyno. I bought the Vert from a 40 year dealership owner who kept it for himself. I haven't confirmed, but I suspect he took Museum Delivery and may have some friends in BG. Either way, I haven't had any of the normal C5 issues and I've driven the schyt out of this thing in the last 2 years.

I haven't dyno'd since but....... I'll see you in Ft. Wayne next weekend

Michael

Ego-Trip

Your formula is not quite correct. You cant take 315 and add 20%. You have to find the base number that gets 20% subtracted from it to end up with 315.

315 + 20% = 378 (wrong)

394 - 20% = 315.2 (right)

Its a common error.

shurite44

I dont use 20% that is my error, or not error how ever you want to look at it. But 315 rwhp does not = 394 crank in a vette A4. I have a software program that does calcs for you based on different numbers you can plug in. But if I were using the method you are I would use about 17%.

Ego-Trip

There are tons of other threads to back up what I said but here is a good one.

http://forums.corvetteforum.com/showthread.php?t=924624

and some testimonials from that thread.......

but dont pay any attention to those....I'm just full of BS

shurite44

I have read thru the posts and I do not see any dispute between the posts. Maybe I am not reading them close enough, but everyone seems to be saying about the same thing. My comment is basically just about the 315 rwhp = 394 crank, I think he is bleeding off too much from the crank in his calculation. His known number is 315 rwhp and and he calculates 394 by bleeding off 20%. I do not think you lose that much between the crank and the wheels in an A4. I also think if he is getting 315 rwhp from a high flow air intake, air bridge and a cat back he has a little stronger than normal LS1.

loudsam

I've heard many forum members say that they can't "burn rubber" with their stock c-5's. My A4 coupe totally stock except for a blackwing and 3.15 rear axle will spin the tires on any pavement, hot or cold, anytime. the tires are eagle runflats inflated to 30 lbs cold. I have never used the brakes to "launch" the car, I don't even know how. I've made this comment in other posts, and some members have agreed their stock c-5's do the same. Others say it's impossible! Go figure! My assesment is that some ls1's run a little stronger that others. I'm still going to do some mods if I can ever save some money. This forum is great!!!

AU N EGL

Dyno numbers dont win races, driving skill does.

but darn nice looking numbers any why you add them up.

AU N EGL

Dyno numbers dont win races, driving skill does.

but darn nice looking numbers any way you add them up.

Allzwell

But ... as you can see ...
There are no opinions here

Black04Vert

I believe MN6 vettes dyno around 295-300 stock and A4's 285-295 stock. The difference being the slightly better drivetrain efficiency in an MN6 over an A4.

My stock A4 dyno'ed at 290 RWHP (5k miles, no mods whatsoever, SAE corrected). My dyno Assuming drivetrain loss of 17-18% that translates to 349-353 SAE net.

If stock A4 vettes dynoed >= 299 RWHP consistently, I can guarantee you Chevy would take advantage of this fact and advertise this engine as a 360 HP engine because it directly translates to higher revenue.

I X L R 8

No one said you were full of BS...........but the dyno you used may be.
There are guys out there with mn6's who dont dyno a stock car that high. 295-305
The mn6 will dyno higher than the a4.
Most a4's come with 2.73 gearing which lowers your dyno numbers even more considering the pulls have to be caculated in second gear.
Third gear is the gear typically used for the numbers and considered the strongest gear.
Not that it cant be done its just that tuners dont generally want a car going 150mph on the dyno pad which is what would happen with an a4 2.73 third gear pull.

For your mods......you numbers are high, in my opinion

Vetteman Jack

That sounds a little high, but maybe you got a very good running A4. I would be pleased too. Let us know what the S/C does to the HP.