How high you rev your LS?
07-04-2004, 06:38 AM
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Re: How high you rev your LS? (Turbo_Siii)
Manufacturers make stock rev limits for a reason, try and stick with their engineering.
LS heads have a weak, soft valvetrain.. you don't want to flirt with anything past 7200 in my opinion.
LS heads have a weak, soft valvetrain.. you don't want to flirt with anything past 7200 in my opinion.
07-04-2004, 12:26 PM
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Re: How high you rev your LS? (Turbo_Siii)
I will be setting the rev limiter at 7500RPM. I don't want to push it too far due to the stress created with boost and higher RPM on stock sleeves, pistons and rods. My head isn't stock though. Custom grinded camshafts, Skunk2 intake manifold, ARP head studs, Super Tech valve springs, Super Tech titanium retainers and Super Tech seats.
07-04-2004, 02:30 PM
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Re: How high you rev your LS? (b16hybridsol)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16hybridsol »</TD></TR><TR><TD CLASS="quote">what is th obsession with reving high why not stay in your power band</TD></TR></TABLE>
It probably has something to do with the fact that a well built LS motor can make power up to/beyond 8.5k rpms, hence they would be staying in their powerband.
It probably has something to do with the fact that a well built LS motor can make power up to/beyond 8.5k rpms, hence they would be staying in their powerband.
07-04-2004, 03:21 PM
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Re: How high you rev your LS? (PureTeg420)
he said stock, which is what 98% of al the other people that ask this question have give or take a header or intake. I understand if you have different cams etc.. But seems like everyone wants to have a 9-11k reving motor seems like hype RR syndrom
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07-04-2004, 03:59 PM
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Re: How high you rev your LS? (Turbo_Siii)
....w/ my stock LS head setup...I was able to peg up to 7750rpm after my HONDATA S200B install/tune. Kinda scary since I only have cam gears and everything else on the head is OEM stock.
07-04-2004, 07:22 PM
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Re: How high you rev your LS? (Turbo_Siii)
I did just as well racing cars "as fast as me" shifting at 6500 as I did shifting at 7000. I know, not exactly a precision test. Due to the flat power output from 6-7K on a stock LS head, you might want to shift just a hair past 7000 and try to keep the operating power in that high spot - if you have traction, that is.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HybridKOOP »</TD></TR><TR><TD CLASS="quote">LS heads have a weak, soft valvetrain.. you don't want to flirt with anything past 7200 in my opinion.</TD></TR></TABLE>
Words of wisdom, live by them.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HybridKOOP »</TD></TR><TR><TD CLASS="quote">LS heads have a weak, soft valvetrain.. you don't want to flirt with anything past 7200 in my opinion.</TD></TR></TABLE>
Words of wisdom, live by them.
07-04-2004, 10:47 PM
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Re: How high you rev your LS? (J. Davis)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by J. Davis »</TD></TR><TR><TD CLASS="quote">I did just as well racing cars "as fast as me" shifting at 6500 as I did shifting at 7000. I know, not exactly a precision test. Due to the flat power output from 6-7K on a stock LS head, you might want to shift just a hair past 7000 and try to keep the operating power in that high spot - if you have traction, that is.
Words of wisdom, live by them.
</TD></TR></TABLE>
my car stops making power after around 6,500 , so i dont take it any higher then 6,700 usually
Words of wisdom, live by them.
</TD></TR></TABLE>
my car stops making power after around 6,500 , so i dont take it any higher then 6,700 usually
07-05-2004, 10:17 PM
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Re: How high you rev your LS? (J337_UNIT)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by J337_UNIT »</TD></TR><TR><TD CLASS="quote">my car stops making power after around 6,500 , so i dont take it any higher then 6,700 usually</TD></TR></TABLE>
Well, if we look to what Hyundaidata did with their reflash of the K-series powered Si, they didn't make one single solitary more "peak" horsepower, but they increased the car's 0-60 time by one full second. How? By increasing midrange power, which occurs right where you don't use it when drag racing? Or by raising the revlimit a tad so that you stay at (approx) peak power between shifts instead of falling down the power graph by shifting earlier and into lower rpms?
FYI, I'm a good one for offering partial explainations without thinking... I shift at 6500-ish due to turbine restrictions, power starts falling off. A "better" setup wouldn't have my problems, but in the Trailerpark we run what falls to hand.
Well, if we look to what Hyundaidata did with their reflash of the K-series powered Si, they didn't make one single solitary more "peak" horsepower, but they increased the car's 0-60 time by one full second. How? By increasing midrange power, which occurs right where you don't use it when drag racing? Or by raising the revlimit a tad so that you stay at (approx) peak power between shifts instead of falling down the power graph by shifting earlier and into lower rpms?
FYI, I'm a good one for offering partial explainations without thinking... I shift at 6500-ish due to turbine restrictions, power starts falling off. A "better" setup wouldn't have my problems, but in the Trailerpark we run what falls to hand.
08-16-2004, 02:51 PM
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Re: How high you rev your LS? (TinyLSHatch)
I've got crower valve springs and TI retainers with their 63404 cams. my car keeps pulling all the way to 8k, I'm scared to go any higher. I'm worried about the rod bolts. 
08-16-2004, 03:19 PM
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Re: How high you rev your LS? (Chris22215)
I over-revved my LS head to about 7500-8000 by mistake (rev limiter was taken off), and all the valve lash nuts loosened and the valve clearances got fucked up. The LS head doesn't flow well past 7k anyway, and you run out of cam, so no need to rev higher.
k20 will take care of what the ls wont handle!
08-16-2004, 03:46 PM
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Re: How high you rev your LS? (Teg4e)
The LS head flows perfectly fine all the way up to 8k easy. I have a completely stock internal LS and shift at 7500. WHY? b/c my car CONTINUES TO rise with HP even at that HP lvl. You guys just dont have a turbo that can push at the higher RPMS. THAT is why you think your LS cant make power.
08-16-2004, 05:27 PM
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Re: How high you rev your LS? (95GSRTT)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95GSRTT »</TD></TR><TR><TD CLASS="quote">The LS head flows perfectly fine all the way up to 8k easy. I have a completely stock internal LS and shift at 7500. WHY? b/c my car CONTINUES TO rise with HP even at that HP lvl. You guys just dont have a turbo that can push at the higher RPMS. THAT is why you think your LS cant make power. </TD></TR></TABLE>
*Cough* Full-Race T3/T67 *Cough*
*Cough* Full-Race T3/T67 *Cough*
08-17-2004, 03:39 AM
#18
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When my engine builder built my motor he added shims to the stock springs to give me an extra 10lbs of pressure. Good idea if you don't have the $ to go all the way on the head. But needless to say, I'm still not revving the stock cams past 7,500.
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