B18B1LS1

iTrader: (12)

Isn't that a little extreme?
The car is a 98 SS M6 with a Vortech blower, bolt-ons and a completely stock motor internally with custom tuning.

LS1LT1

iTrader: (16)

Hmm, would you really ever need to rev a supercharged motor that high? <img src="images/icons/confused.gif" border="0"> Either way, that is very high to be revving on the stock valvetrain, I wouldn't make a habit out of it.

VINCE

iTrader: (1)

You should not have to rev that high.. what does your dyno say your peak is.. I would shift at 200rpm higher than your peak and thats it...

O2BQIK

Sounds pretty gutsy to me... <img src="gr_eek2.gif" border="0">

PhantomTA

Stupid without valvetrain modifications... you trying to destroy your motor?

And why the hell would anyone want to rev that high past your peak power?

Kinda like those musclecar guys saying.. yeah i can rev it to 7200rpm.. its fast..
Yeah that .420 .420 196/198 116ls cam really doesnt peak at 4600rpm itl rev to 7200..
<img src="images/icons/rolleyes.gif" border="0">

B18B1LS1

iTrader: (12)

The car isn't mine it's my friends car. He said his power peaked at 6500, but I haven't seen the dyno sheet yet. I just thought that was too high for those crappy valvesprings, but I wanted some second opinions. Thanks!

SSBoy

With STOCK internals and the blower, wouldn't his peak power stay right around where the stock rev limiter? (6250) I cant see how a vortech blower would help wind that car all the way up to 6800rpms. I just can't understand why he wants to shift it that high if he has the stock cam AS well as stock internals. anyhow, not a good idea to do.

Colonel

So, NO valvetrain mods? ...And the stock cam?

(It shouldn't peak that high with the stock cam.)

2001bird

Not really...... superchargers and turbos just tend to enhance the power curve, not alter peak pionts! His peak power should be within 100-200 rpm of his peak power before the blower.

Not wise to rev the engine that high..... He is getting into some serious valve float and lifter pump-up at those rpm's.

brendon

I second that the s/c'er enhances the stock power curve, that is atleast how it is with most other motors. Blower or no blower, stock valve train...6800 rpms <img src="gr_eek2.gif" border="0"> <img src="graemlins/gr_guns.gif" border="0" alt="[guns]" /> motor

[ February 10, 2002: Message edited by: brendon ]</p>

Terry Burger

iTrader: (4)

The blower motor will always make more power at a higher RPM unless you pass the peak efficency of the blower itself or run in to some other RPM related problem (valve control, port stall, etc). The output is directly related to the boost and the boost is directly related to the RPM. The higher the RPM, the more boost, the more power.

The Dragon

iTrader: (6)

Motor's gonna go like Hiroshima <img src="graemlins/gr_judge.gif" border="0" alt="[judgement]" />

Wish I could be there to see/hear it though <img src="graemlins/gr_devil.gif" border="0" alt="[devil]" />

Freak

I agree with Terry, at least with centrifugal chargers.

My buddy has a 98 SS with a powerdyne 6# blower. He has dynoed MANY times trying to work out the tuning. Even before he upgraded to the Hotcam the Hp curves were ALWAYS going up strong when the dyno was shutdown at about 6100. this was the firstthing I noticed when looking at the dyno.

B18B1LS1

iTrader: (12)

It is internally bone stock!!! I'll have to see this dyno sheet for myself I guess. Maybe he was mistaken about peak power. But he does take it up that high for some reason <img src="images/icons/rolleyes.gif" border="0">
Hopefully I can convince him to quit before his motor goes ka-boooooom <img src="gr_sad.gif" border="0">

Terry Burger

iTrader: (4)

A blower should always peak at the highest RPM you rev it. <img src="gr_images/icons/wink.gif" border="0">

CHRISPY

He is going to toast that motor revving that high.
Boost has a negative effect on spring pressure, he is definitely going to float the valves and hurt something.
Chris

Matt98SS

I had the same problem with nitrous. it was real hard on the stock springs to where I would get valve float easy even NA. switched to 941s and it helped dramatically

Matt98SS

I agree with Terry too, it will make HP till you reach a restriction....which in this case would be the valve springs