After doint H/C and only ending up with about 380 rwhp, I've begun to wonder about a SC'r.

I always thought a SC was good for 200 hp but I just hear that a SC would only add 110??

what's the real deal on SC rwhp???

 

check out my sig,,,,,,im not sure how to post pics on here or i would post my dyno,,,,,,,,or i could email it to you if you would like

 

I know you really love your roadracing, so I would avoid forced induction as they usually always have some form of heat problems. I could just imagine what one would be like out on a 30 min lapping session in the middle of the summer.

 

RWHP with a S/C is dependent on how much boost you want to push into the engine. There is no RWHP number that a S/C will add....more boost = more RWHP.....and more boost, still more RWHP....and finally enough boost = KAAABOOOM. :cheers:


[Modified by HIGHRPM, 12:36 AM 12/2/2002]

 

With the P-1 S/C (and no other changes) I went from 346 rwhp to 471 rwhp . It only cost $5,000 to fix the problems on the existing kit to make it run right. After that I had a cam and heads installed for more power (cause 471 was not enough) ;) Now I run 619 rwhp and I could not be happier.

Total cost for S/C kit, S/C kit fix, heads, cam installation & tuning... $12,600.

Good Mods=lots o money!!

Best of luck to you in your mod choices. :)

vetterdstr :cheers:

 

619rwhp in a convertible C5 - SWEET!!!

Mike M

 

90-100% is possible

 

How much boost are you running and you didn't mention anything about internals, hope you can keep the bottom on that thing if you do I'll try pushing a few more pounds in mine but my cr is high and it scares the crap out of me.

 

I cant give away all my secrets. ;)

vetterdstr :cheers:

 

What's the lb of boost to hp relation again? 20 rwhp per lb of boost or something like that. How much boost you run depends on the gains you get.

 

If you have a stock bottom end LS-1 I would not push more then 7 lbs. At that level with monor bolt ons (headers, exhaust, intake) you are 500+ rwhp. We have got 540rwhp out a bone stock Z-06.. We only recommend running 5 to 6 lbs on the higher compression LS-6.. :seeya

 

Have any of you SC junkies roadraced your cars since you have had the blowers installed? I just wonder if you can beef the cooling system up enough, affordably, to be able to withstand a blower while out on the track lapping at 4000+rpms for a half hour or more at a time.

 

It depends on several things.

It depends on the compression in your combustion chamber. The larger the volume, the lower the compression, and the more benefit you can get out of the blower and more boost you can run. A stock LS6 won't get as much % benefit from a supercharger compared to a stock LS1 (all other things being stock) due to the fact that it runs at a higher compression in the combustion chamber.

Also depends on how free the intake air and exhaust gases can move through the system... through the intake manifold, through the head ports, through the exhaust manifolds/headers all the way to mufflers (if you have them).

Also, the benefit depends on the timing of how long the intake and exhaust valves stay open to be able to move the increased amount of air/exhaust out through the motor.

Then, there's the amount of boost that also affects how much hp/tq increase you can get depending on what your engine can handle.

Cooling also plays a part. The the more boost with the blower will cause more heated air which can lead to detonation, so if you want to run higher boost (besides making sure all the other variables are in place correctly like lower compression, stronger internals, like forged pistons, etc.), make sure you have an intercooler.

Looking at it another way... if you modified your engine to get the maximum benefit of a supercharger in order to increase your hp/tq the most you could, and then you removed the supercharger from the scene, your engine would most likely put out lower hp numbers than even before you started messing with it, just due to the fact that it's now setup specifically for a supercharger.

So what I'm saying is that you can add these Vortech, ATI, Magnuson kits to your stock engines, but you're not going to get nearly the benefit from them as what's possible if you do the other modifications, such as ported heads, custom cam, forged pistons (likely dished more if you keep your stock heads cc the same volume), long tube headers, etc. etc.)

At least, this is what my supercharger research has led me to believe so far.

 

JB'sblownC5 has raced his car in the heat and has had no problems. :)

Mine will be raced in a few months... As far as I know I have much more cooling stuff already on my car than JB does. SoI do not expect any problems. I will let you know how it goes. ;)

vetterdstr :cheers:


[Modified by vetterdstr, 12:04 PM 12/2/2002]

 

In an article about the Magnacharger, the quoted hp/psi boost was ~20 hp/psi.

 

So using the 20 ponies / pound formula 7 equals 140. Since I have beefed up the bottom end with forged pistons, arp bolts, etc. I could get another pound or 3 maybe 180-200 rwhp.

MattG is absolutely correct about the road racing though. If it wouldn't live for 30 minutes constantly toggling between WOT and standing on the brakes then It might not be the right choice.

Looking forward to road course track results from the SC crowd.

 

I don't think you'll necessarily continue gaining 20 hp/psi due to the increase in inlet air temp after being compressed. Looking at a curve on the Magnusson site, I think I remember the temp nearly doubles with only a 3 psi increase in boost. The higher temps may lead to detonation w/o an intercooler.

 

Steve.... how would you increase the boost ?? pully change?? Is one avalible??

:crazy:

 

Steve02C5; what pistons are you using in your motor and what rings?? Are the pistons flat top or dished some?? Thanks ZO6Bill
:flag

 

First off, I am sure Steve is way more qualified to answer this and I am sure he will chime in. I have also seen his car and have seen it run and it is awesome. With that said, it really isn't a matter of how much you can increase the boost or how to do it. I am sure the Magnuson SC is just a pulley swap away from providing more boost. The Magnuson has no means of cooling intake air(intercoolers). The problem, as Steve stated above, is with the temperatures of the intake air as it is compressed. The higher the boost the higher the intake air temps. Which if not cooled/controlled(via intercooler) will lead to detonation and ultimately the untimely demise of the inards of your engine(ie fried pistons).

Another thing to consider in this equation of boost as it relates to horsepower is intercooled boost. I am under the impression that a cooler boost temp gives you more horsepower per inch of boost. So 7psi of non-intercooled boost is not necessarily equal to 7psi of intercooled boost.......would this be a correct statement? I have the itch for a Supercharger and am still undecided on which path to take.

John