verbs

With the size of the G5X3 and the addition of my Comp R lifters, I'm debating on bumping the rev limiter to 7200rpms.

My car's bottom end has handled 7000rpms flawlessly for 15000 miles now. Keep in mind I have a 2001 LS1 with the upgraded rod bolts and better oil pump.

What results have you all had doing this? Longevity? Problems?

2001 Pewter WS6

iTrader: (43)

Your asking for trouble... Only do it if you are prepared to face the consiquences. That is a lot of stress on the rods and rod bolts. It only sounds like 200 rpm but the stress on the parts is magnified...

angst911

stress increases exponentially w/ RPM's

jrp

iTrader: (16)

any particular reason you want to? is your setup still making power at 7200 rpm.

Jason99T/A

iTrader: (21)

You definitely will be pushing it. I have pushed a few stock bottom ends higher than that, but you definitely will be on borrowed time. I'd say go for it though. I think the power/torque curve will be falling off WAY before that though due to the valvetrain.

AZ Power & Sound

iTrader: (2)

Why dont you invest in a new shifter first and ditch that POS hurst... thats going to give you more time than the extra 200 rpm will in the 1/4... plus with how fast it revs and the fact that the tach will be WAY behind in the first 2 gears... is it really worth a motor? Its a given that your gonna smack the rev limiter at least once or twice just because of how far the tach is behind.... and since we just finished de-ricing your car I dont think its a good idea to get a monster tach

Just kiddin verbs!

But seriously... you WILL hit the limiter... and I dont have time to build you a bottom end right now leave it at 7000

Damian

iTrader: (89)

Asking for trouble bro. Better put aside enough cheese for a new motor before you start pushing your current motor to it's limits...Unless you want a lot of downtime. JMO

BigBronco

iTrader: (2)

And if your motor is still making enough power that high up, and you have a new motor just so happening laying around to go in if it blows, i say do it.

but that is tough, but it seems like it is a time bomb if you go with that!

chief455

iTrader: (21)

I'm new to LS1 but everything points toward staying where you are. You dynoed it- where was peak hp/tq? Thay seems very high to me, even if the bottom was built for it.
My only reference is my 474 Pontiac. I built it to handle 7000-74000 rpm, but it made peak hp at 6200 and tq at 4400 and loves to shift at 5800..so I put a 6400 chip in it I hit the limiter all the time cause it revs so fast, but there's no power up there. Uses the tq to pull rather than winding the **** out of it to squeeze a mph. Play it safe, IMHO

Cricket99SS

Ah don't worry, these engines love the RPM! Rev limiter set to 7,200 here with a TINY TR224 cam and AS Stage II heads. I'm not really sure how this little cam pulls up that high, but I've been bouncing off the limiter for a while now.

This is also an auto-x/rr car, so It's not just little drags down the 1/8th or 1/4, but many miles of keeping the rpms flying. This is also a 99 car with the stock oil pump too.

Plus the exhaust doesn't sound good until about 6,800 rpm anyway.

How often do you hear someone on here posting that they grenaded their engine, naturally aspirated, from a bottom end failure? I'm not talking about a spring letting go at 7000+ and dropping a valve, but the rods flying apart and what not. Not very often. If you are staying n/a, let her rip! Take her up to 7,500 if you want.

deviate42

iTrader: (2)

well ill put in my .02


..if you do spin it that high...get some video!

Cal

iTrader: (1)

Install some ARP rod bolts and go for it! I've heard of forged SBC's going to 9,000 rpm. And some with stock low ends going to 7000 rpm.

Ryan02SS

iTrader: (3)

Spinning a TR224 to 7200rpms is simply a waste of wear and tear on your motor along with the fact you are probably slowing yourself down by reving your motor way past it's peak power and shifting at a point where your power has fallen way down. Have you ever dynoed your setup to see where peak power comes in at? My TR224 peaks at a little over 6000 rpms and holds almost flat to 6500 rpms where I shift. My rev limit is 6800 rpms but at that rpm level horsepower has fallen to 380rwhp from 399 max rwhp, I bet at 7200rpms you will have dropped 40rwhp from your peak.

Josh

iTrader: (9)

A friend of mine told me he crosses the traps doing 7600 RPM on his stock bottom end. I thought he meant 6700 at first, but no, he really did mean 7600.

I wouldn't ever even think of taking my car that high.

Josh

v8maro

iTrader: (4)

How far can we safely spin the stock inards N/A? I goto 6400rpms all the time, I don't think I am at risk at all. 7200 seems kinda crazy if you ask me

Cricket99SS

Don't have a dyno with the 7,200 rpm rev limiter. We have tried all kinds of different points to shift at, from 6,400-6,600 ish, to pegging the 7,200 rev limiter and power shifting all the way down the track. Either way the 1/8th mile times are all in the 7.6Xs @ 93.X mph.

I know it's not an LS1, but my friend runs his SBC at the top of 3rd gear on his TH350 at 8,100 rpm with just different rod bolts, and this engine is many years old.

Yall don't be so scared of high revs! These engines are made for it.

Hardtop

iTrader: (3)

I think anything over 6800 rpm regularly is asking for trouble. I have rod bolts in my car and hit 6800 every once in a while, but try not to make a habit out of it. Sooner or later

Bruce

Cricket99SS

How often do you hear about kaboomed LS1s running n/a from revving too high? Anyone want to do a search through the archives?

KGSloan

if people are worried about blowing up their motor, don't spin it that high. it's just that simple. if you not, like me, spin the crap out of it (if there is actually power to be had there). my car has been taking 7000rpms for a while now but i'm not to worried. racing breaks stuff, that's just part of the game. if you're not breaking anything, you arn't really racing


on another note, a guy i know locally acutally did blow up a stock bottom end. he shot a rod right out of the block. however, i, nor he, has any idea how high he was spinning it (he's kind of slow when it comes to cars). there was no revlimiter on his car and he was taking it to 7k on the tach regularly, which is actually much higher. it lived like this for quite a bit of racing, but eventually couldn't take it anymore.

Pro Stock John

iTrader: (34)

You should do ARP rod bolts, it's not going to last a whole season.