john59

iTrader: (2)

Hi,

I have an 03 convert with the following mods:

Vararam Intake
3.42 rear
Yank SS3600 stall
Corsa Catback
Ported throttle body

Next will be:
Heads or rework mine
Headers /Kooks or Dynotech
Cam/ Suggestions?
Pulley
What kind of combo is needed to get me into the low elevens,and still be streetable,will the stock heads ported with bigger valves support the kind of horsepower thats needed to get me there, or do I need to go to an aftermarket head,the only reason I ask is my friend owns a cylinder head co.with a flow bench that would port and install valves for next to nothing..
I really don't want to use nitrous,motor only
Thanks
John

XTrooper

You'll be able to run in the 11's with a decent heads/cam and your current setup, but low 11's and "streetable" with your stock-displacement, A4 car is a damn tall order.

You'll need a BIG cam and a BIGGER converter to accomplish it. The other alternative is nitrous.

john59

iTrader: (2)

I didn't think it would be so hard,I was at Moroso last night and watched an LS1 camaro and a TA LS1 go at it running 11.5's, after talking with them they run stock displacement motors no nitrous.I was thinking because of the weight difference to the F body that it was possible
John

smask04C5

iTrader: (1)

had a 69 camaro that ran 8.70's at 157 mph, dry sump small block 2090#'s, all it took was lots of $$$$$$$$$$$$$$

baldurann

iTrader: (15)

Sticky tires, cam, and ls6 or better heads, and the rest of the bolt-ons. Adjustable suspension wouldn't hurt, either.

XTrooper

There's no question we can get these cars to run in the low 11's and faster. That's not the question. The question is can this specific car do it, and here's the catch, do it and "still be streetable." Streetable is a totally subjective term and it can mean totally different things to different people. What might be considered "streetable" by one might be, and often is, totally unacceptable to another. My personal opinion is that to run in the low 11's in a full-weight A4 car with stock-displacement that it takes too big a cam and too big a converter for the average person to really be happy with the end result. A larger displacement motor that you get away with putting a bigger cam in or a shot of nitrous to get you over the hump on a stock-displacement car would get you into the low 11's with a friendlier-to-drive, more "streetable" car.

Also, fwiw, the weight difference between a full-weight C5 and a full-weight F-body isn't that great. The race weight of my 1999 Camaro SS was ~3640 lbs and the race weight of my C5 is ~3525 lbs. They say 100 lbs is worth 1/10 second in the 1/4 miles so you can see the weight advantage isn't a huge one.

Homeslice (tm)

I'm stock....


11.0

All you need is a trunk mounted intercooler.

NOSjohn

iTrader: (9)

Yes, a trunk mounted IC that sprays a 200 shot of juice...

Homeslice (tm)

Nitrous IS the god of all power adders.

Gordy M

iTrader: (2)

My 2000 FRC weighs 3196 lbs with a full tank of gas, I thought the coupes were only 110-130 lbs more.

john59

iTrader: (2)

Thanks Guys

Streetable to me because I live in Fl. is the ability to drive down I95 at 80mph or around town in traffic without running hot or real choppy idle, in all honesty I will be happy if the car ran mid to high elevens but after seeing the Camaro and Ta run mid elevens,I just thought it shouldn't be to hard to get a Vette to go low elevens.Would a 100 shot installed correctly ever hurt an Ls1 motor.

John

C5 Purple Haze

3525 is his cars race weight with the drivers weight in the car.

Kraest

iTrader: (3)

My car is plenty drivable and with an addition of some ported LS6 heads, 470+ rwhp is very doable. My car doesn't see over 185 degrees in 95* heat and 100% humidity.

The F-13 cam from Futral Motorsports drives VERY well. That with some ported LS1/LS6 heads will put you there no problem.

Mike

fast 98 C5

You can do it, I did. Heads and cam and tunning and exhaust.

owndjoo

iTrader: (2)

sorry to thread jack, but this has been bothering me. FRC? cant figure it out. and i know what you mean by the streetable thing, most people think my talon with open downpipe, gutted interior and no radio or a/c isnt streetable at all. but i drive it around town a good bit. not daily, but i do take 30 min. plus drives. just depends on how fast you wanna go and what you are willing to sacrifice

john59

iTrader: (2)

Thanks for the input guys

I'm really not looking to put a radical cam in the car that's going to tear up springs every 5-10K miles, Futral looks to have some really good cams and I've heard really good things about them, do you think that F 13 would work with my combo, and how much horsepower do you think I'm leaving on the table by not going with:

Oversized valves- 2.02
LS6 Head
AFR'S -205's

Thanks
John

XTrooper

Either you lost some parts along the way or you need to find a new scale.

The official weights for the C5 are:

Z06 = 3118 lbs.

That 3118 lbs. is empty with no fuel and the Z06 was built lighter than the hardtop aka FRC. Now add 18 gallons of gasoline @ ~6 lbs per gallon and you're up to 3226 lbs. Add to this the weight of the driver, 180 lbs in my case, and you come up with a total of 3406 lbs. There's no way in hell your FRC weighs only 3196 lbs. with a full tank of gas unless you've done some serious weight-reduction mods. If you subtract the weight of the fuel from that 3196 figure, that would put your car's curb weight at only 3088 lbs, 30 lbs. lighter than the Z06!

Coupe = 3246 lbs.
Convertible = 3248 lbs.

My C5 is a convertible. The curb weight of the car as you can see above is 3248 lbs. Add the weight of 18 gallons of gasoline to that (I'm using 6 lbs. though it's actually a little more than that) and you have 3356 lbs. Now add the weight of the driver (again 180 lbs.) and you come up with a total of 3536 lbs.

As I said, my race weight is 3525 lbs. with a bit over a quarter tank of gas. My car is a bit heavier than it should be because of the heavy-*** aftermarket chrome wheels mounted on it.

XTrooper

Mike,

Remember that we're talking about an A4 car here. It'll take more than a good set of heads and the F13 to see 470 rwhp in a car with an auto tranny.

XTrooper

FRC stands for Fixed Roof Coupe the unofficial term coined by owners of the C5 hardtops that were made in the 1999 and 2000 model years. Starting in 2001 they were discontinued and replaced by the first Z06's.

NOSjohn

iTrader: (9)

FRC = fixed roof coupe, the "daddy" of the Z06's. Chevrolet first introduced them as a low cost option to the fully optioned cars so more people would buy them. In all reality, when optioned, the cars were just as expensive as the regular coupes. After 2 years of barely any sales, Chevy decided to "up the ante" and add more performance option to this FRC to entice customer - intro. to the Z06.

John59 - a 100 shot would work great in your car...it would take it without a second thought. Many guys are spraying 200, 250, 300 shots (with proper equipt.) on the LS1/6.