Intakes, LS1, LS2, LS6, Fast

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Dec 26, 2006 | 09:57 PM

JimmyZ78

Thread Starter

Racer

Joined: Oct 2006

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From: Glendale AZ

Intakes, LS1, LS2, LS6, Fast

What do you prefer and why? What are the pro's and con's of say the LS2-LS6 for F/I?

Dec 26, 2006 | 10:24 PM

mdhmi

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From: Detroit

What size motor are you talking about? How big is the cam? How high are you going to rev the motor? Where in the power band do you desire to make power.

Your question can't be answered without knowing the answers to these questions first.

Dec 26, 2006 | 10:35 PM

Skunkworks

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From: Chicagoland Area IL

I have some flow numbers if it will help.

Dec 26, 2006 | 11:24 PM

chriswtx

Le Mans Master

Joined: Feb 2002

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From: San Marcos Texas

Dec 27, 2006 | 12:02 AM

Skunkworks

Melting Slicks

Joined: Apr 2005

Posts: 3,418

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From: Chicagoland Area IL

LS1 75mm TB
RPM__TQ__HP
2000 326.4 124.3
3000 364.2 208.0
4000 399.1 304.0
5000 428.6 408.0
6000 408.8 467.0
7000 366.6 488.6

LS6 75mm TB
RPM__TQ__HP
2000 332.2 126.5
3000 366.0 209.1
4000 402.9 306.9
5000 436.9 415.9
6000 421.4 481.4
7000 370.7 491.1

Weiand/LPE 75mm TB
RPM__TQ__HP
2000 325.3 123.9
3000 365.9 208.8
4000 405.2 308.6
5000 430.3 409.7
6000 400.9 458.0
7000 362.2 482.7

LS2 90mm TB
RPM__TQ__HP
2000 322.2 122.7
3000 366.8 209.5
4000 398.3 303.4
5000 428.5 407.9
6000 427.5 488.4
7000 373.6 497.9

FAST LS2 90mm TB
RPM__TQ__HP
2000 330.1 125.7
3000 364.8 208.4
4000 399.8 304.5
5000 439.2 418.1
6000 426.6 487.7
7000 387.8 517.0

Test engine LS6 with 236/241 cam

I'll dig up more info tommorow (actual flows).

Mike

Dec 27, 2006 | 06:37 AM

JimmyZ78

Thread Starter

Racer

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From: Glendale AZ

I guess I should have been more specific

sorry. Stock bottom end, APS TT, Turbo Grind cam, 317's. I'd like a good low end torque curve.

Dec 27, 2006 | 10:56 AM

FactoryRaceCar

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St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12

I would do LS6 in your case

Dec 27, 2006 | 11:10 AM

0Brian@FI Performance

Former Vendor

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From: FI Performance : Norwalk Connecticut www.FIPERFORMANCE.com

One of the Vette Mags did a whole intake manifold test, it had a black c4 427 wide body on the cover. IIRC LS6 on the tester LS2 did very well.

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Dec 27, 2006 | 12:38 PM

mdhmi

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From: Detroit

Quote:

Originally Posted by FactoryRaceCar

I would do LS6 in your case

Here Here. Stock cubes and a mile cam I'd stick with the LS6 intake.

Dec 27, 2006 | 01:09 PM

#10

Skunkworks

Melting Slicks

Joined: Apr 2005

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From: Chicagoland Area IL

For the money the LS6 intake on stock cubes is hard to beat even though Ls2 can be had fairly cheap.

I still have not found good info on intake when used with FI or boost. The speed of sound changes as you add boost so does the mass (your density went up) so the resonant tuning method used in NA apps falls apart. What may work great for one person will not for others, as can be observed by varying opinions and results. In a all out applications (high boost) shorter less restrictive runners net you more then a nicely tuned intake. I don’t have LS1/6 results to confirm this but seen results on Fords.

Mike

Dec 27, 2006 | 01:58 PM

#11

chriswtx

Le Mans Master

Joined: Feb 2002

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From: San Marcos Texas

I thought I saw Roadrebel post that he was getting good results out of the LS2 intake/90mm with FI motors...

Dec 27, 2006 | 02:00 PM

#12

mdhmi

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From: Detroit

Quote:

Originally Posted by Skunkworks

I still have not found good info on intake when used with FI or boost.

There are several TTi Stage X cars running around with both stock and big cube motors with the LS2 intake manifold and ported 90 MM LS2 TB.

I kept my LS6 intake manifold and stock LS1 TB as I didn't feel the potential gains of an LS2 were justified on my conservative street combo.

Dec 27, 2006 | 02:04 PM

#13

NICK YOSKIN

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From: PA

St. Jude Donor '08

Quote:

Originally Posted by mdhmi

yeah mark especially when boost can easily be increased electronically!
oh.....sd tuned of course.

Dec 27, 2006 | 02:10 PM

#14

mdhmi

Team Owner

Joined: Jul 2003

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From: Detroit

Quote:

Originally Posted by NICK YOSKIN

sd tuned of course.

I've been researching this topic for quite some time and just haven't been convinced that SD would complement my setup. If AEM made a plug and play unit for our cars or if BS3 implementation was much cleaner I might feel differently.

One of my goals for 07 is to have a separate MAF tune for bracket racing. I want to be able to stand on it at the line and run 11.51's all day long, as 11.50 is the point where a cage is required.

You don't have to run 9's just to have fun.

Dec 27, 2006 | 02:28 PM

#15

stevieturbo

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From: Northern Ireland

n/a test results dont mean anything when comparing to a forced induction setup.

Dec 27, 2006 | 02:50 PM

#16

mdhmi

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From: Detroit

Quote:

Originally Posted by stevieturbo

n/a test results dont mean anything when comparing to a forced induction setup.

Read my earlier post. Documented gains have been established with the LS2 intake manifold and ported LS2 90mm TB on multiple twin turbo cars.

There is a torque loss down low, but you pick up some power up stairs.

Dec 27, 2006 | 10:31 PM

#17

JimmyZ78

Thread Starter

Racer

Joined: Oct 2006

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From: Glendale AZ

OK, well I bought a LS2 Intake and Tbody. Thanks for the info. A SC'd car here locally is making 640rwhp with a LS2 setup, stock bottom end. He just upgraded to a 402 with the same intake setup and we are awaiting dyno numbers.

Dec 27, 2006 | 11:08 PM

#18

Vince99FRC

Safety Car

Joined: Jul 2004

Posts: 3,706

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From: Valrico Florida

Quote:

Originally Posted by JimmyZ78

Since he is going bigger he should have the LS2 intake ported..

Dec 28, 2006 | 10:22 AM

#19

RoadRebel

Melting Slicks

Joined: Mar 2003

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From: Macomb MI

Quote:

Originally Posted by mdhmi

No ported TBs here. I do a very simple cleanup on the intake manifold removing mold flash etc and bolt them together. Its it the best boosted manifold I have found and certainly a very cheap combination to boot!

Phil