Any 427 LS3 guys running a TVS or Whipple setup? - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

2SS45th · 03-05-2013, 07:50 PM

I remeber when I told TSP I wanted a 427 to boost they said to keep the boost low because the 427 LS3 is already weaker than a 376. The Maggie will do it, but you can't crank the boost, nor will you be able to on a motor that big.

SERVED_USMC · 03-05-2013, 08:00 PM

Quote:

Originally Posted by 2SS45th

I remeber when I told TSP I wanted a 427 to boost they said to keep the boost low because the 427 LS3 is already weaker than a 376. The Maggie will do it, but you can't crank the boost, nor will you be able to on a motor that big.

What psi did they tell you?

Unreal · 03-05-2013, 08:19 PM

You can always sleeve it. It is only weak if you use factory sleeves.

Nitroman28 · 03-05-2013, 08:59 PM

Quote:

Originally Posted by BullF-16

4.125" stroke honed out to 4.07" is 429 CI, this is how the website describes it. For the 427 it is 4.07" bore stroked to 4.1"

Yea I was thinking 4.125 stroke with a 4.125 bore. I was thinking about putting sleeves in mine and going to a 4.125 bore. That would have been 440. Backed out just going to do a 418.

VADER SS L99 · 03-05-2013, 09:06 PM

With a Whipple and less than 10 psi and that compression I would think you would make some killer power. More than can be used on the street anyway and certainly enough to where the whole fuel system needs to be upgraded to twins and ID-850's. The torque is going to be insane and your going to have to work on putting the power down before you could even use that kind of torque. I know you mentioned that TSP has fixed the long stroke stock sleeve issue but that would be the only thing that would worry me. With that kind of compression make sure you tuner is a great one as well.

2SS45th · 03-05-2013, 09:34 PM

I was told 8psi, so not a whole lot. The extra stroke will be more difficult in the motor because the angle that the rod is at coming back up is greater. Then when you add boost that rod is shoving the piston at the sleeve, so I'd air on the side caution.

Motion427 · 03-05-2013, 09:50 PM

He might be better off going with a centri style blower,because with a pd blower,the torque will be crazy down low rpm.Could always go with a YSI and keep the boost under 10 psi.

The 427-429 LS3 had issues with the piston skirts and not the block.I think the issue got fixed though like one of the members posted earlier.

willhe64 · 03-06-2013, 09:16 AM

Quote:

Originally Posted by Motion427

He might be better off going with a centri style blower,because with a pd blower,the torque will be crazy down low rpm.Could always go with a YSI and keep the boost under 10 psi.

Yes, and he'd be able to keep his fast102 intake setup.

SERVED_USMC · 03-06-2013, 02:52 PM

Quote:

Originally Posted by Motion427

He might be better off going with a centri style blower,because with a pd blower,the torque will be crazy down low rpm.Could always go with a YSI and keep the boost under 10 psi.

The 427-429 LS3 had issues with the piston skirts and not the block.I think the issue got fixed though like one of the members posted earlier.

Has Procharger fixed their issues with the leaking gaskets?

Jayrcr3 · 03-06-2013, 03:12 PM

Quote:

Originally Posted by Motion427

He might be better off going with a centri style blower,because with a pd blower,the torque will be crazy down low rpm.Could always go with a YSI and keep the boost under 10 psi.

The 427-429 LS3 had issues with the piston skirts and not the block.I think the issue got fixed though like one of the members posted earlier.

+1
My stock block whipple has unusable low end torque. With the 427 it will be even worse.

Sent from my HTC One X using Tapatalk 2

BullF-16 · 03-06-2013, 03:32 PM

Quote:

Originally Posted by Jayrcr3

With the 427 it will be even worse.

Agreed, on my old LS3 i used to have to keep the RPM up above 3000 or so to get any good TQ/ boost out out of my D1SC. With this LSX427, pretty much anything above 2000rpm and i have to manipulate the throttle to avoid losing it!

SERVED_USMC · 03-06-2013, 06:23 PM

On a side note, do my dyno numbers seem low to anyone? I had a few people on another board say something about it. Being that this is my first real dive in the 427, Im not sure if these numbers are close or not.

Bad Dad · 03-06-2013, 07:19 PM

ERL m1 ls3 427 resleeve for blower 9 : 7 compression long DI sleeves here whipple 3.25 pulley 114 cam 704 rwhp 695rwtq on a mustang dyno engine eats twin disc clutch like an oreo

Jayrcr3 · 03-06-2013, 07:21 PM

Your numbers add up to about 610 crank hp. Maybe a little low, but could just be the dyno.

That's what a stock LS3 makes with a Maggie on it.

Sent from my HTC One X using Tapatalk 2

03-05-2013, 07:50 PM	#15
2SS45th Drives: 11 Seconds or Faster Join Date: May 2012 Location: Arvada, Colorado Posts: 2,797 View My Garage	I remeber when I told TSP I wanted a 427 to boost they said to keep the boost low because the 427 LS3 is already weaker than a 376. The Maggie will do it, but you can't crank the boost, nor will you be able to on a motor that big. __________________ I Ain't About That Stock Life.

03-05-2013, 08:19 PM	#17
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	You can always sleeve it. It is only weak if you use factory sleeves. __________________ Nick Corvette Z06 -1200ish rwhp

03-05-2013, 09:06 PM	#19
VADER SS L99 Drives: 2013 A6 GT 5.0 Join Date: Nov 2009 Location: Edmond, OK Posts: 2,909	With a Whipple and less than 10 psi and that compression I would think you would make some killer power. More than can be used on the street anyway and certainly enough to where the whole fuel system needs to be upgraded to twins and ID-850's. The torque is going to be insane and your going to have to work on putting the power down before you could even use that kind of torque. I know you mentioned that TSP has fixed the long stroke stock sleeve issue but that would be the only thing that would worry me. With that kind of compression make sure you tuner is a great one as well. __________________ BLK/BLK 1SS/RS Ordered 11-01-2009 Took delivery 12-22-2009. Heads/cam/converter/bolt ons. SOLD Feb 2015 to fund 6th gen LT1 SS with 8L90E.

03-05-2013, 09:34 PM	#20
2SS45th Drives: 11 Seconds or Faster Join Date: May 2012 Location: Arvada, Colorado Posts: 2,797 View My Garage	I was told 8psi, so not a whole lot. The extra stroke will be more difficult in the motor because the angle that the rod is at coming back up is greater. Then when you add boost that rod is shoving the piston at the sleeve, so I'd air on the side caution. __________________ I Ain't About That Stock Life.

03-06-2013, 07:19 PM	#27
Bad Dad Drives: 2010 2SS/RS , 2011 C6 Base Corvette Join Date: Feb 2010 Location: Naples Florida Posts: 774 View My Garage	427 ERL m1 ls3 427 resleeve for blower 9 : 7 compression long DI sleeves here whipple 3.25 pulley 114 cam 704 rwhp 695rwtq on a mustang dyno engine eats twin disc clutch like an oreo __________________ SUICIDE BY RACECAR

03-05-2013, 09:50 PM	#21
Motion427 Account Suspended Drives: 2010 2SS/RS Red Jewel L99 Join Date: Jun 2011 Location: NB,Canada Posts: 834	He might be better off going with a centri style blower,because with a pd blower,the torque will be crazy down low rpm.Could always go with a YSI and keep the boost under 10 psi. The 427-429 LS3 had issues with the piston skirts and not the block.I think the issue got fixed though like one of the members posted earlier.

03-06-2013, 06:23 PM	#26
SERVED_USMC Drives: Slow Join Date: Feb 2013 Location: IN Posts: 268	On a side note, do my dyno numbers seem low to anyone? I had a few people on another board say something about it. Being that this is my first real dive in the 427, Im not sure if these numbers are close or not.

03-06-2013, 07:21 PM	#28
Jayrcr3 Drives: 2011 IOM 2SS/RS Join Date: Dec 2010 Location: Chatham, Illinois Posts: 756	Your numbers add up to about 610 crank hp. Maybe a little low, but could just be the dyno. That's what a stock LS3 makes with a Maggie on it. Sent from my HTC One X using Tapatalk 2 __________________ American Racing 1 7/8" Headers and Hi-Flow Cats, CAI cold air intake, Flowmaster AT exhaust, Vengeance Racing Stage 2 cam, VMax ported throttle body, TEA valve springs and titanium retainers, Trick Flow hardened pushrods, 180* T-stat, Comp Trunion kit, ZL1 Fuel Pump, ADM Fuel Pump Control Module, 20% window tint, Whipple Supercharger. Tuned by Mike Norris Motorsports. 656rwhp/584rwtq @10 PSI.