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I have a stock 2000 LS1, with the A&A T-Trim kit.
I'm at 565 hp with 10lbs of boost.
Can I go down in pulley size and run 12 lbs of boost?
Or will the bottom end, end up all over the track.
Very little street use. Car sees 3 or 4 track events a year.
Sits in the garage most of the time, hoping to do more track events.
Honestly its all in the tune with a little luck on your side. Meth would help safety of it if you did go to 12 pounds tho. Most will say to stay around 600 rwhp without meth on 92/93 and around 700rwhp with 92/93+ meth or E85 on stock bottom and of course there are those that push it much farther
I would think making the motor more efficient might be a bit easier on things than just increasing the boost such as LT headers/exhaust, Blower cam, better heads, better intake etc.
Honestly its all in the tune with a little luck on your side. Meth would help safety of it if you did go to 12 pounds tho. Most will say to stay around 600 rwhp without meth on 92/93 and around 700rwhp with 92/93+ meth or E85 on stock bottom and of course there are those that push it much farther
I would think making the motor more efficient might be a bit easier on things than just increasing the boost such as LT headers/exhaust, Blower cam, better heads, better intake etc.
I will be over 600 rwhp next week, at 10lb of boost.
Doing full exhaust.
I am already at 10lbs of boost.
So what do you wanna bet? I posted the dyno sheet several times.
I wish it was only 8lb, I could lower the pulley and get more hp.
If you're at exactly 10.0 PSI now with stock exhaust, and you're adding full exhaust, you're making your motor more efficient by allowing it to exhale. Whether it's .5 or 2psi, you're going to lose a bit of boost. Great time to pulley down and add meth.
If you're at exactly 10.0 PSI now with stock exhaust, and you're adding full exhaust, you're making your motor more efficient by allowing it to exhale. Whether it's .5 or 2psi, you're going to lose a bit of boost. Great time to pulley down and add meth.
this is what we meant. boost is basically a measure of restriction. your head unit pushes a certain amount of air into the engine at a certain RPM (at a certain atmospheric condition). the intake manifold, heads, valves, cam, exhaust manifolds, and exhaust pipes can only allow a certain amount of air through. the air being pushed by the head unit gets pushed back by the restrictions in the rest. the pressure inside is measured as boost. if you open up the exhaust with headers & bigger mids, you create more volume for the air to escape the engine through & lessen the resistance created by the pipes. since more air can now flow out, you'll have less pressure inside the manifold (less boost). you're still moving the same amount of air; it's just more efficient.
typical boost drop from stock to headers/dual 3" is around 1.5psi
If you're at exactly 10.0 PSI now with stock exhaust, and you're adding full exhaust, you're making your motor more efficient by allowing it to exhale. Whether it's .5 or 2psi, you're going to lose a bit of boost. Great time to pulley down and add meth.
He didn't see that angle...lol...
He was ready to bet the farm...
I get 8.7psi on what was to be a "10psi pulley" with AR longtubes and full exhaust.
haha, i remember when i bought my TVS (right after the LS1 kits started coming out), i told the rep at Magnuson i wanted 8psi. they said their normal pulley should make 6, so they went ahead and just threw in one a couple sizes smaller as a bonus since i told them i just did full exhaust. we got it all installed with the 3.3 for a baseline & it was already making 8.5psi
i ended up running the 2.9 a year later anyway for just under 11psi.
but that was just the guys at Magnuson guessing wrong because only a few kits had been sold so far, and they didn't have a lot of info as far as modded engines went.
520 @ 7psi with just Longtubes w/cats
585 @ 8psi (Same pulley as above) with Cam / Longtubes no cats / upgraded inlet pipe and filter to 4in (This I believe gave me + 2psi)
600+ @ 8.5 (1 size down in pulley) with mods above and Borla Stingers and Meth
Well I'm at 590 hp. Dyno guy tried to get me over 600hp but the cam just wont let me.
Pretty stock engine, super charger and exhaust.
Steal works and Borla straight pipes. This is the loudest vette I have ever heard.
I am pretty sure I will be trading the Borla for some stock TI's.
Still at 10lb of boost, but that is cause of a smaller pulley.
Well I'm at 590 hp. Dyno guy tried to get me over 600hp but the cam just wont let me.
Pretty stock engine, super charger and exhaust.
Steal works and Borla straight pipes. This is the loudest vette I have ever heard.
I am pretty sure I will be trading the Borla for some stock TI's.
Still at 10lb of boost, but that is cause of a smaller pulley.
yes, a forged bottom end, heads and a cam have been in the plans since the a few month before I bought the C5.
Eventually I want to break 900 hp.
But that is many years away.
I think I am going to do a cam and meth next.
Your 588 is based on a SAE of 1.26 as opposed to 1. So your numbers are a little inflated. Some one else can chime in if that is 2 whp or 25whp as I don't recall anymore.
Regardless, that is a nice power band and I'm sure she runs like a scolded dog
10-10-2014, 09:49 AM
12lbs of boost?
