Fahad

If i sheft on 6200 or 6300 RPM and my engine is stock without HPP3 .
What The problems that run into me ??? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

98TAauto

iTrader: (2)

you will simply hit the rev limiter if you havent raised it with the HPP3 on a stock car

even if you riase the shift points there with HPPS i wouldnt advise it on a stock internal car!

for one its hard on the internals, and for two you're not making more power shifting higher with stock internals

Bill

Thanks, 98TAauto for your comment! With my HPP3, I activated the powertuning and upped the max engine RPM to 6,200 (5,500 to 6,600 range) . . . it's at 6,000 now (stock)! Even though I didn't hear any pinging or valve float, NoGo (# 2308) scared me . . . "Pushing the limits of the stock valvetrain is living on borrowed time IMO."

So my question to you, since you have a LS1 auto, would there be any advantage in lowering the max RPMs to say, 5,800? And by doing so, would that screw up the quarter mile? Reliability & longevity is one thing, but what about performance? From what you say, it's not effected (and it has the ring of truth to it).

Then again, a broken valve train would offer an excellent opportunity to replace the cam and heads. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

And if the valves hit the pistons, then I'll also have an excuse to put in a stroker <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> Don't the LS1 pistons have reliefs? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

<small>[ August 15, 2002, 09:56 AM: Message edited by: Bill ]</small>

Bill

Anybody? <img border="0" title="" alt="[Embarrassed]" src="gr_emb.gif" />

StevieZ

iTrader: (3)

If you cam the car and change the pushrods and springs then you can raise it to match the cam but if nothing has been done to the valve train then just leave it alone. There is no reason to change it.

Fenris Ulf

Most of the really fast stock internal guys raise their limiter to 6300 or 6400 and shift at 6200 rpms. Even though you aren't making any more power at 6200 rpms, you are racing with a better average applied power through the quarter.

Bill

Thanks, StevieZ & Fenris Ulf!

I think that I'll leave it at 6K on the street and increase it to 6.2K on the strip . . . surely the GM engineers designed the valve train system, to withstand a 3% increase. If not . . . well, I'll have a good reason to throw some more money around. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

<small>[ August 15, 2002, 04:12 PM: Message edited by: Bill ]</small>