Track Results of LS2 Intake
11-22-2004, 01:32 PM
#42
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Originally Posted by Camaroholic
Dang man, I would have expected better results than that.
Did you smooth the intake ports on the manifold? Mine were very 'edgy' where the intake was assembled. I smoothed all 8 ports, made them a nice transition.
I hope to have back to back dyno numbers within 2 weeks, and a track visit on the 11th. I plan to take the LS2 intake with me to the dyno, and do the remove LS6 / install LS2 while strapped down. That is, if I can ever get it all together.
I'm hoping to see 10-15 rwhp over the LS6 / Ported TB that I have on my solid roller 383.
Did you smooth the intake ports on the manifold? Mine were very 'edgy' where the intake was assembled. I smoothed all 8 ports, made them a nice transition.
I hope to have back to back dyno numbers within 2 weeks, and a track visit on the 11th. I plan to take the LS2 intake with me to the dyno, and do the remove LS6 / install LS2 while strapped down. That is, if I can ever get it all together.
I'm hoping to see 10-15 rwhp over the LS6 / Ported TB that I have on my solid roller 383.
We shall see soon as I can get hold of another intake or two to play with.
I certainly hope your results are better than mine!
Brad
11-22-2004, 04:11 PM
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Something seems weird. LG puts the LS6 intake with the TPIS 90mm TB on his AFR G5X3 package and goes from 465 to 485 RWHP. And this is with the LS6 with the 90mm end grafted to it not with the 90mm FAST. Cartek has a cam and intake(FAST 90MM) car stock heads and goes 10.90's@126-even they showed more power over the stock LS6 intake and TB on stock LS6 heads. LG had similar results going from 427 to 447 adding the Fast 90mm on a Z06 with the G5X3. Then there is the combo from Tony Mamo that makes 480-490 on a small 224/228 cam. Something must be going wrong or the LS2 is just terrible on the inside.
11-22-2004, 04:30 PM
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OK, so this will be the ignorant question portion of the thread. Straight up LS2 block/intake combo works just great from GM. With this type of result would a LS6 intake be better on the LS2 block? Has it been tried, or is it going to far back in development? I am going to swap out to a full LS2 conversion and was thinking about waiting for the LS7 intake or perhaps using the LSX 90mm combo, any ideas? I tell you what, this kind of info gets my panties in a bunch.
11-22-2004, 04:48 PM
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Okay Guys, I just made a bunch of phone calls. I have a 90mm LSX that I can use for testing as well as an LS6 intake. I just need a Ported TB for the LS6 intake.
Talked to my tuner and he is more than happy to accomodate the testing.
Whats the catch? Gotta wait 2 or 3 weeks
Brad
Talked to my tuner and he is more than happy to accomodate the testing.
Whats the catch? Gotta wait 2 or 3 weeks
Brad
11-22-2004, 05:18 PM
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Originally Posted by See5
You do have plenty of fuel for the additional air? Injectors?
AFR was fine all the way to 6600rpm. It was very rich on the first pull with the tune for the ls6 intake.
Did not check the duty cycle though I believe they would be close to maxed out. I plan on upgrading soon.
Brad
11-22-2004, 05:20 PM
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New Cam, gears and TC 3/8/04 7.29 94.11 1.59 3.90 PT4000
90mm TB, intake ..........5/3/04 7.199 95.79 1.571 3.90 PT4000
These are my gains in the 1/8 with the LSX. I gained 20HP and have seen the LSX on 346cubes do it regularly.
A noted tuner tested the LS2 vs LSX as making 20HP less N/A and more on FI. Can't remember how much. If logic follows then the worst that you should have done is no gain. Somethings wrong.
90mm TB, intake ..........5/3/04 7.199 95.79 1.571 3.90 PT4000
These are my gains in the 1/8 with the LSX. I gained 20HP and have seen the LSX on 346cubes do it regularly.
A noted tuner tested the LS2 vs LSX as making 20HP less N/A and more on FI. Can't remember how much. If logic follows then the worst that you should have done is no gain. Somethings wrong.
11-22-2004, 05:21 PM
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Originally Posted by See5
You do have plenty of fuel for the additional air? Injectors?
11-22-2004, 05:33 PM
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Originally Posted by CSiJason
Thats EXACTLY what came to mind when I read the first post. Your no doubt pulling in a lot more air with that manifold and much larger t-body than the tune was intended for.
It was tuned with this intake on it. It had to be leaned out to make more power.
It is hard for me to believe that the intake would cause such a loss in power.
But there is nothing else that I can find wrong with the car.
Brad
11-22-2004, 05:36 PM
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I read in the GM mag that a LS2 intake isn`t much differant than a LS1 intake. It just allows a 90mm TB and has a upward tilt to the TB for puddling. The sensors are relocated also. I will post the exact words later. Thats not my words. Just the GM mag talking about the LS2. I`m getting a LSX 90mm and 90mmTB as we speak. Should be out by friday. I will post before and after numbers.
11-22-2004, 05:58 PM
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The LS2 resembles the LSX intake inside far more than it resembles the LS6.
On the LS6 intake, the inlet ports (inside the manifold) are "trumpet" bell shaped. On the LSX and LS2, they are more square. And the 3-piece nature of the LS2 is quite obvious in how it's fitted together - a lot like the LSX.
On the LS6 intake, the inlet ports (inside the manifold) are "trumpet" bell shaped. On the LSX and LS2, they are more square. And the 3-piece nature of the LS2 is quite obvious in how it's fitted together - a lot like the LSX.
11-22-2004, 06:52 PM
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Originally Posted by P Mack
Knock retard maybe? Do you know what your MAF was reading before and after the swap?
Tuned it with the stock descreened MAF. Changed it out a week later and let it learn the new MAF and went back to the dyno.
After tuning with the new MAF we picked up more power.
Which leads me to believe this intake is not flowing what it should.
Brad
11-22-2004, 07:12 PM
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The beginning of the LS2's intake runners are a tad bit smaller than the LS6's 'trumpet' shaped inlet (doesn't make much sense with the additional cubes). I'd say the LS-6 resembles the LSX more than the LS2 resembles the LSX. The LSX has a stepped runner. The LS6's runners are more stepped ('trumpet'-like) than the LS2's. The LS2's runners are straighter. Phew, mouthfull...I haven't the slightest clue of what GM was thinking with the design change of the runners. They would've been much better off if they toyed with stepping the runners even more like the LSX. The 90mm inlet was made that size for EGR placement changes (straight out of a GM engineer's mouth). He didn't mention low-end response for the goat, but that's also a benefit. I would've guessed no loss, but around the same pwr both being as-cast.
I've been all through 4 different LS intake styles. I personally only chose the LS2 because of its price and the 90mm inlet. Mine has been completely modified, so I couldn't really compare it to another for 'fair' results. I got rid of the crummy 3piece mating issue with a lot of filling, welding, and sanding throughout, along with the 'straighter' runner issue with some cutting and remodeling of the runner inlets (now tapered).
I spent a couple yrs doing overbores and port work on throttle bodies and intakes before getting deeper into the fab business. Though I eventually got out of it, I still have most of the machines. If you'd like, you can send your 75mm unit this way and I'll set it up for you and the test. Just plan for 4 days turn-around for modifications and shipping. In any case, the end results will be interesting.
I've been all through 4 different LS intake styles. I personally only chose the LS2 because of its price and the 90mm inlet. Mine has been completely modified, so I couldn't really compare it to another for 'fair' results. I got rid of the crummy 3piece mating issue with a lot of filling, welding, and sanding throughout, along with the 'straighter' runner issue with some cutting and remodeling of the runner inlets (now tapered).
I spent a couple yrs doing overbores and port work on throttle bodies and intakes before getting deeper into the fab business. Though I eventually got out of it, I still have most of the machines. If you'd like, you can send your 75mm unit this way and I'll set it up for you and the test. Just plan for 4 days turn-around for modifications and shipping. In any case, the end results will be interesting.
11-22-2004, 07:24 PM
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What are the specs of the LS2 intake? I have been scouring every place I know to look, but I can't find them. I am looking for:
plenum volume, runner length, runner volume
I want to compare them to the LS1 and LS6 intakes.
plenum volume, runner length, runner volume
I want to compare them to the LS1 and LS6 intakes.