LS-2 intake test
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Tenured Member
Joined: Jan 2002
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From: MN
LS-2 intake test We ran a three part test of the new LS-2. The first test was a baseline with the stock intake using our TPIS 90 mm throttle body and a LS-1 ecu with a stock f-car cal.
The second was with our TPIS LS-6 modified for our oval throttle body.
The third was with the FAST intake with our TPIS 90 mm throttle.
All test were run with our new C-6 header
what is not evident with above numbers is the amount of torque improvment that the TPIS oval provides from an idle to about 4600 which is about 5 to 8 better than the FAST. The oval is the better street choice. From 5000 to redline the FAST intake steps ahead about 5 to 9 HP over the TPIS oval.
Remember we sell Fast products as well as our own.
myron c
The second was with our TPIS LS-6 modified for our oval throttle body.
The third was with the FAST intake with our TPIS 90 mm throttle.
All test were run with our new C-6 header
Code:
baseline torque hp
rpm 4600 468.6 410.4
5800 413.6 456.8
test 2 4800 485.9 444.1
5600 444.9 474.4
test 3 4700 491.6 439.9
5600 446.3 475.9 Remember we sell Fast products as well as our own.
myron c
Great results Myron. They seem consistent with what we've seen in the past. An LS6 intake with a bigger throttle opening is nearly as good as the FAST 90mm intake/TB combo. It's just a shame that your oval setup for LS6 intakes is almost as pricey as a FAST 90mm intake and TB (assuming you didn't already have an LS6 intake to start off with). Keep the tests coming!
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Thread Starter
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Joined: Jan 2002
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From: MN
Originally Posted by ls1290
What makes the LS2 intake perform less than the LS6?
Keith
Keith
That is a complex question. I believe that the runner volume or area is just to large. This style of intake all ready has a large plenham volume, and its very east to over do it. I'll take a manifold that produces more power in the lower half of the range that you normally drive in over one that makes a big dyno number. To answer the question will a LS-6 or the current FAST fit an LS-2.
Yes, it will bolt to the heads ,but the inj. are shorter and the fuel rail bolt pattern is different. and GM has changed the inj. plug. We are working on a simple solutions.
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TECH Apprentice
Joined: Oct 2004
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The problem was with the large strokers and high rpm 346's the LS6
had too long of a runner length and not enough flow capability.
It cut down flow on these 340 CFM heads by a ton.
There needed to be something which allowed the TQ and HP peaks to
be higher on the high winding 346 and strokers. This was supposed
to be the answer, but I guess it is not.
With the LS7 motor that appears to be the direction things are going to go,
with a "standard template" ported LS6 head, maybe an LS7 style intake
manifold can be created.
However the LS7 will not work because the LS7 heads are C5R derived.
had too long of a runner length and not enough flow capability.
It cut down flow on these 340 CFM heads by a ton.
There needed to be something which allowed the TQ and HP peaks to
be higher on the high winding 346 and strokers. This was supposed
to be the answer, but I guess it is not.
With the LS7 motor that appears to be the direction things are going to go,
with a "standard template" ported LS6 head, maybe an LS7 style intake
manifold can be created.
However the LS7 will not work because the LS7 heads are C5R derived.
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Verdad Gallardo TECH Apprentice
Joined: Oct 2004
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Exactly.
There is something wrong here, maybe to do with the way the ports match
up, injector angle or something. This manifold was supposed to be an improvement
over the LS6 and when GM has delivered an improvement, it has been an improvement....
There is something wrong here, maybe to do with the way the ports match
up, injector angle or something. This manifold was supposed to be an improvement
over the LS6 and when GM has delivered an improvement, it has been an improvement....
Myron...
In a 382 all stroke motor, currently using LS6 intake and ported stock TB, descreend MAF, cam= .611/.619 242/250 114, 200+ wet nitrous shot, automatic, 4000 stall, 3.42 gear, BIG exhaust (1 7/8 to 2" headers, 3 1/2 collectors, 3 1/2 Y pipe and all the way back)....
what is the best combo in terms of high rpm power (street race mostly) for this application...
LS6 intake with ported TB (duh)
FAST 90 intake with 90mm TB
Your LS6 intake with your TB
LS2 intake/LS2 TB
It looks like I can get a LS2 intake and TB pretty cheap, but don't know what eles is needed to swap it on my car...
SDB
In a 382 all stroke motor, currently using LS6 intake and ported stock TB, descreend MAF, cam= .611/.619 242/250 114, 200+ wet nitrous shot, automatic, 4000 stall, 3.42 gear, BIG exhaust (1 7/8 to 2" headers, 3 1/2 collectors, 3 1/2 Y pipe and all the way back)....
what is the best combo in terms of high rpm power (street race mostly) for this application...
LS6 intake with ported TB (duh)
FAST 90 intake with 90mm TB
Your LS6 intake with your TB
LS2 intake/LS2 TB
It looks like I can get a LS2 intake and TB pretty cheap, but don't know what eles is needed to swap it on my car...
SDB
The problem with the LS2 is that it is being tested on a stock 346 motor. The intake is designed to flow more for a larger CID motor. The results will be completely different on a large inch motor.
Nate
Nate
Thread Starter
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From: MN
Originally Posted by Nasty N8
The problem with the LS2 is that it is being tested on a stock 346 motor. The intake is designed to flow more for a larger CID motor. The results will be completely different on a large inch motor.
Nate
Nate
The test that I posted was done on a LS-2 crate engine. We have reports from various customers the LS-2 does not perform any better on a big inch engine. If we test one on stroker I will post it.
mc
TECH Enthusiast
Joined: Jan 2004
Posts: 539
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From: Grand Rapids, MI
Just in case you guys missed it, in the april issue of Hot Rod they did some engine dyno testing of the LS2 and when they swapped out the stock LS2 intake and 90mm TB for and '04 LS6 intake and TB, they picked up "8hp and a huge 16 lb-ft of torque".
TECH Apprentice
Joined: Jan 2002
Posts: 356
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From: Texas
Myron, or any vendor with a LS2 intake sitting around, can you please give us some visual idea on the LS2 intake? It has been mentioned that there is an excessive amount of casting material along the seems of the LS2 intake that require removal. Is this true? If so, is it enough to disrupt the airflow? Just curious, as all the info coming on this forum and others is really painting the LS2 manifold a flop.
Todd
Todd
Wow my bad sorry Myron I just AssU&Med it was a smaller motor I had expected it to do better on the 6.0L. I think anything under 600hp does not need anything near a 90mm anyway. Good to know
Todd it has its casting flaws but nothing worse than the LS6 and certianly not as bad as the FAST.
Nate
Todd it has its casting flaws but nothing worse than the LS6 and certianly not as bad as the FAST.
Nate
Thread Starter
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From: MN
Originally Posted by SDB
so, its either the TIS or 90mm FAST intake for me it seems...
Because you have a 383 and sounds like you drag race the FAST may be for you.
I took the time to average the hp from 4500 to 6500 on the LS-2 test,that we posted, for both intakes. The results are that both intake concepts are within 1HP of each other. If you average the test from 2500- 6500 rpm the TPIS oval comes 8 hp ahead. I think my solution is more elegant, but then I would.
myron c