Piersin

Right now I have the Vortech SQ trim blower on an LS2. It made about 490 in the auto. I ditched the auto for a manual and it made 540 and 481 peak torque on a really cold night because I added the LG PRO headers. Probably makes about 530 on a 70 degree day. It was over 8lbs of boost because of the dense air. Right now it makes 450rwtq at 3800 RPMS

My question is what would you do to make more torque without gaining as much hp? I have a restriction for the class I run in of 563rwhp. So I can pick up about 30hp and be fine but I want to maximize my down low. I was thinking smaller pulley and then detune/pull timing on the big end. What would you do?

Thanks for your help.

MB

DeltaT

iTrader: (5)

I'd do a 25 shot of nitrous that will probably pay off with a 75lb boost to your rwt on a FI setup.

There's really nothing else except a bump in your motor's displacement that will deliver what you're asking for.

If you can't manage that small a shot, maybe try a larger blower pulley and larger shot? I hope your class doesn't limit you to 1 power adder...

Jim

gametech

iTrader: (1)

You may be the first person I have read who has a legit reason to spin their centrifugal blower faster, but put a restrictor plate in front of it. The restrictor plate will limit the total airflow, while allowing full torque at lower rpm's.

Piersin

Thanks, I thought about that. Wouldn't that basically be the same as detuning the peak? Which one would be more efficient from a heat perspective the restrictor or detune?

I also found an LS2 Cheater and Comp 921 Spring kit for $500

99-TR-CHEATRLS2-CAM Thunder Racing Custom Camshaft
"LS2 CheaTR" - 215/230 .629/.592 117 LSA. Off Idle-6800 RPM Power Band. Broad power range. Works well with stock exhaust manifolds and catalytic converters. Stock like idle. Minor tuning required on automatic transmission cars. Responds very well to nitrous. Due to the fast ramp rate of this camshaft, the use of 1.8 rockers is not recommended. Comp 921 Valve Springs are highly recommended.

63-26921-KIT Comp Cams 26921 Dual Spring Kit - Suitable to .650 lift with more aggressive ramp-rate cams - Kit includes valve springs, titanium retainers, spring seats & valve stem seals.

I'm a little concerned about the fast ramp rates, it must be durable for hammering 20mins at a time.

gametech

iTrader: (1)

20 minutes at a time? Perhaps you should give a little more detail about the entire combo. Most of the questions around here involve drag racing, so if this is ENTIRELY different, then more specifics would help.

Zombie

iTrader: (2)

This limitation screams for a th400 and a small stall lol. Sure mr official, you can dyno it, it only puts down 520 RWHP on the dyno *snicker*

Piersin

I like this idea actually. But it's actually more of a road racer.

BTW What is the biggest motor you can make right now with a 4" Stroke? Warhawk? Something suitable for boost.

98turbls1

iTrader: (17)

Well with a 4.125 bore you can make a 427ci.. That alone would make your hp.. I would just fudge your hp with a tune and then change it right after.. haha..

Zombie

iTrader: (2)

I figured it was road racing, forward manual valve body + stall and lots of trans cooling. You would have a SERIOUS power advantage over everyone (at least 100 hp, probably a lot more). You would have to choose different lines possibly, but the extra power would more than make up for it. If you wanted to get really tricky with it you could run a switch pitch converter, 1500 on the tight end and 3000 on the loose, that would be very very sneaky and let you play more tricks with the dyno.

Until they banned an auto setup like that.

Piersin

Hmmm, very interesting. I'll have to give this some thought. Thanks Zombo

NicD

iTrader: (7)

Smaller pulley, cut the timing out up top within reason. Gotta watch your EGTs playing that game.

Zombie

iTrader: (2)

BTW, my car made just under 500 uncorrected "horse power" on a mustang dyno and trapps 133-134 at 3800+ lbs in the 1/4 mile. I say if they want to play the dyno HP game use it to your advantage, I know I would

CHRISPY

I'd pulley the blower to spin faster and test restrictors to get the peak down. That'll give the best of both worlds hands down...(limit top end and boost midrange torque)

ECS has restrictors for Vortech setups

Piersin

Thanks guys for your responses. I know I'm not a regular here but I appreciate it.

Right now I have a 4" Pulley. I can get a restrictor and either a 3.8" or a 3.6.

Thought on which size?

Piersin

Also with the restrictor is the supercharger still producing as much heat.

So for example say the 3.6 produces 11lbs of boost normally. With the restrictor on it only produces 8-9lbs at peak. Is it still creating the same amount of heat as 11lbs?

99.9percenter

iTrader: (2)

No,AS long as the restrictor is on the inlet side of the blower.

ChevyChad

iTrader: (50)

umm... ditch the vortech for a turbo???