98CayenneT/A

yup

My stock bottom end '98 hits the limiter at 7500 all the time.

stockA4

I read somewhere GM powertrain wanted 8k tach in the c5 but they didn't get it due to packaging ect... what was the stock rev limiter for the 02-04 ls6 again?

Honestly with all I've tried at this point I would just about take any cam on the shelf under 0.575" lift and happily rev it to 7500 with just a set of longer hardened btr pushrods and summit LS6 springs without measuring anything in any halfway decent looking longblock out there. If it doesn't live it wasn't meant to

jetech

DANG Man!...you're gettin it.

Bob570

Cayenne is right, shifting at 6300 is going to be waaaaay too low. Your car is going to be a lot faster shifting around 6800-7000.

Your LQ4 probably has stronger rod bolts than Cayenne and I do in our LS1s, rod bolts in LS engines were updated in 2001. Mine has seen 7000 rpm thousands of times, I've put 10,000 miles on my current setup and it gets shifted right at 7000 a bunch of times every time I take the car out.

jetech

Thanks Bob570. I appreciate your response. I feel better hearing some of you spin your engines way up there.

pdxmotorhead

Back in the day... County fairs had a thing where they would sell spots on a card, and put a tack with a telltale on a engine run stand.
Was a charity event.. You'd pay a buck a piece for tickets and you'd sign up for a RPM every 50 RPM. Betting on when she would blow..

One year they got a hold of a brand new ish 305 out of a Car,, stock engine with a quadra jet and no air cleaner, just a automatic flywheel , in the past most engine spilled their guts at like 8K,,

They set the thing up in the middle of the arena and chocked the throttle wide open..
It peaked about 8500,, and ran there.. till the 5gal can was empty.. Then they did it again.. Almost 2 hours at WOT with no load..
Sounded crazy with manifolds and 2 cherry bombs..
Everybody got bored and they drew numbers out of a hat to pick the winner..

jetech

HAHAHAHA That's funny.

AwesomeAuto

I've never broken one from RPM, and I've done some stupid stuff.

cino

iTrader: (28)

LQ9 cast iron block and full floating connecting rods like gen IV is a very solid fundation.
Tougher than LS1s and should stay together up to 7000+rpm if the rest of valvetrain is up to the task and camshaft is big enough to validate it.

jetech

How high RPM are you talking about?

jetech

Thanks Cino, My LQ9 is a gen III 2002. I don't know, are the 2002 LQ9 rods full floating?

G Atsma

ALL LQ9 rods are full floating.

jetech

Hey thanks for that info G Atsma!

wannafbody

iTrader: (2)

I've read that rod bolts were upgraded in 99 and 01.

jetech

Thanks Wannafbody , How fast do you spin your combo?

95maroz28

iTrader: (21)

When you bent your stock pushrods did it cause any problems or harm the engine?

G Atsma

This is why chromoly pushrods came into being decades before this....

AwesomeAuto

7600 on a 250k mile gen 3 engine with almost stock everything, including pushrods, and I've held it there for ~20 seconds on the limiter doing a burnout.
I've been over 8k on a gen 4 engine more than a few times despite the valve springs definitely not being capable of handling it.

jetech

Salutations my LS aficionado! That is mind blowing!. I have concerns with damaging the heads ($1500) if the bottom end comes apart

02*C5

iTrader: (1)

My first build was an 02 C5. The cam specs where 236/242 615/615 on a 112. I reved to 7200 with shift points at 6800 with a nitrous 150 shot window switch cutting off at 6500. All on stock internals and bottom end LS1. These engines are a lot tougher then we give them credit for.