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Old 01-13-2005, 07:24 PM   #1 (permalink)
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New to C5 Vettes, what is max bolt-on HP?

Hi everyone.....
I might be buying a later model C5 '00-up.
I grew up around turbocharged Audi's, VW's, and Porsches, so I'm used to 20+ psi of boost to get some quick 1/4 mile times.
A friend of mine has a '01 Z06, and I was very impressed with it.
He claims 515 (flywheel) HP with just a cam, full exhaust, larger throttle, reprogrammed ECU, etc. He runs 11.7 @ 126

I also have another friend with a Lingenfelter Twin Turbo Vette ('00 model), and it is SCARY with just 7 psi! I have other friends with Supras with 28psi of boost, but they don't even come close to the LPE Vette!
I'm curious how much (bolt-on, stock block) HP one of these Vettes can take before tearing the engine apart..........
I would love to have a 500whp '00-up Vette.........Is that possible with bolt-ons?
Thanks!
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Old 01-13-2005, 07:31 PM   #2 (permalink)
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It all depends on what you consider a bolt on. A Supercharger is a bolted on external to the motor, but not what I call a bolt on. To me bolts are headers, air intake etc. 500 RWHP it not obtainable from bolt-ons.

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Old 01-13-2005, 07:37 PM   #3 (permalink)
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By bolt-on, I meant on a motor with stock internals, including stock compression ratio.
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Old 01-13-2005, 07:37 PM   #4 (permalink)
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390 RWHP is about the max from bolt-ons (headers intake, tuning)

480 RWHP cam, heads and headers

550 plus from a 427 stroker all motor

500 to 600 RWHP from a Blower


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Old 01-13-2005, 07:41 PM   #5 (permalink)
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If I would bolt on a SC (I have had good success with Whipple SCs), how much boost can I run without changing pistons, rods, etc?
How much HP can I expect? (assuming high flow intake and exhaust)
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Old 01-13-2005, 07:49 PM   #6 (permalink)
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Unfortunately Whipple does not make a blower that will fit under even a modified Vette hood. It's just too tall. :( Magnacharger makes one (Eaton-built blower), if you're looking for a positive displacement blower.

Keep the boost in the 5-6psi range (on a Z06 which has 10.5:1 CR) or 7+psi on an LS1 C5 (10.0:1 CR) and you should make 480-500+rwhp (Z06) and have no issues.

The centrifugal blowers (Vortech/ATI) will make more peak hp at the same boost level since they are more efficient in the higher rpm range.
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Old 01-13-2005, 08:47 PM   #7 (permalink)
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Thanks for the info..............
Anyone have 1/4 times and trap speeds with any of these SC set-ups?
What about nitrous? What's the most than can be used (individual port)
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Old 01-13-2005, 08:53 PM   #8 (permalink)
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Most people don't spray any more than a 100 shot on a stock motor.
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Old 01-14-2005, 05:11 AM   #9 (permalink)
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You can safely spray a 150 shot, IMO.

I have a set of headers, cold air intake and a Vortech blower. Power is in my sig. I've only been to the track once, but was slip sliding all over the place and couldn't get into the gas until 3rd gear. 11.30@129. Best prior to the blower was 11.96@118.5.

I'll be bolting on some sticky tires in the spring to run some 10s
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Old 01-14-2005, 07:04 AM   #10 (permalink)
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You might come damn close to 500rw with every bolt-on imaginable (LSX intake, Large (Read: LARGE) cam, Heads, headers, catback, intake, pullies, throttle body, etc). I think there's a car or two (if memory serves) that made it to that degree. More likely is ~480rw with all those goodies. 440-450rw seems to be about right for most "BIG" daily applications with just the forementioned minus intake/throttle body combo.
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Old 01-14-2005, 07:11 AM   #11 (permalink)
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Quote:
Originally Posted by WA 2 FST
Unfortunately Whipple does not make a blower that will fit under even a modified Vette hood. It's just too tall. :( Magnacharger makes one (Eaton-built blower), if you're looking for a positive displacement blower.

Keep the boost in the 5-6psi range (on a Z06 which has 10.5:1 CR) or 7+psi on an LS1 C5 (10.0:1 CR) and you should make 480-500+rwhp (Z06) and have no issues.

The centrifugal blowers (Vortech/ATI) will make more peak hp at the same boost level since they are more efficient in the higher rpm range.

WHAT DO YOU MEAN BY THIS?

"Keep the boost in the 5-6psi range (on a Z06 which has 10.5:1 CR) or 7+psi on an LS1 C5 (10.0:1 CR) and you should make 480-500+rwhp (Z06) and have no issues."

I have a stock C5 (2000), so what is recommended safe PSI for me? I was looking toward the ATI Procharger from Andy.

Thanks
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Old 01-14-2005, 08:15 AM   #12 (permalink)
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I was referring to the Magnacharger setup.

The ATI and Vortech blowers can run a little more boost...I'm just trying to steer the guy to the conservative side. Since a centrifugal blower builds boost with rpm, its only at its peak static compression ratio for a very short time (as you approach the shift point), so you can get away with a little more max boost... maybe 8-9psi in some cases. Of course, you're not making this kind of boost over the entire rev range, and that's actually an advantage as far as reliability is concerned (although power under the curve is less).

Quite honestly, I know some people run more than that with 10:1+ CR, but I do not believe its wise for the longevity of the engine. You can drown the motor in fuel, retard timing, etc all you want... once the maximum static compression is reached for a given octane of fuel... you're SOL. It will still have detonation. It may not be audible to the human ear, but it can be inaudible and still be doing damage.

If you want to run some serious boost and get the most potential out of the blower, then it requires lower base CR. 8.5:1-9.0:1 for a street car that needs to pass emissions is best.

I'm not trying to steer you, or anyone, away from Andy's stuff. He has a great reputation. Go for it!
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Old 01-14-2005, 04:48 PM   #13 (permalink)
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[QUOTE=d993]Hi everyone.....
I might be buying a later model C5 '00-up.

Just food for thought. Most of the 2003 cars and later, except for the very early 03's have a fuel tank/delivery system that is tougher to tame than with than the earlier cars. Not trying to slam the later cars but if you could find a low mileage cream puff 2002 or earlier you would have an easier time with fuel delivery. If you want over approx 500 rwhp with forced induction then fuel delivery and injectors upgrade is a must. My 2 cents. Good hunting.
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Old 01-14-2005, 05:37 PM   #14 (permalink)
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blower experience

I had a 95 Z28 in 95 and SC'ed it in 96 with a procharger I had Bob Norwood do a lot of custom work to the system including modification to the FMU and the intercooler.
Now, I am not sure if you guys have heard of Bob Norwood, he does a lot of twin turbo ferrari but this guy takes a car all the way to the edge of disaster then one step past it. He had explained to me that as long as you have the air/fuel ratios and the spark your engine wouldn't know it was blown.
He told me since I was only needing ~65lbs fuel pressure @9lbs boost at the intake (stock bottom end) I could spin the blower harder.
Having been offered the opportunity to spin it harder and keep it in line air/fuel wise who could turn that down? We put it on the CPU and spun it to 13lbs boost at the blower and 11lbs at the intake (stock bottom end)! In order to do this I had to run 85lbs fuel pressure.
Like I said one step past the edge of disaster. 4500 miles later no more motor. I took the SC'er off and sold it. I went back to Bob and he told me I was an idiot if I would have just cut the boost to 6-7 psi it'll last forever for less than any other mod for the money other than NOS.
Now I have had the pleasure of listening to the whistle on one car and I think you should be very careful on how greedy you get when playing with a pressurized motor that wasn't built that way from the factory unless you plan to tear it down at some point (most would say a long time if you don't get too greedy) I think Iím going to stay NA with the Z06.
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Old 01-14-2005, 05:39 PM   #15 (permalink)
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Quote:
Originally Posted by WA 2 FST
Unfortunately Whipple does not make a blower that will fit under even a modified Vette hood. It's just too tall. :( Magnacharger makes one (Eaton-built blower), if you're looking for a positive displacement blower.

Keep the boost in the 5-6psi range (on a Z06 which has 10.5:1 CR) or 7+psi on an LS1 C5 (10.0:1 CR) and you should make 480-500+rwhp (Z06) and have no issues.

The centrifugal blowers (Vortech/ATI) will make more peak hp at the same boost level since they are more efficient in the higher rpm range.
Go old school and cut a hole in the hood!
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