With all these comments about the LS2 intake manifold losing power on an LS1, I wonder if the LS6 intake would provide power on an LS2? The engines don't seem that different.

Seems crazy that GM would do that but you've got to wonder.

 

I just saw someone else mention this on another thread but it would be interesting.

 

I don't think that GM is THAT STUPID. Besides, big modifications would be required to make it work..... different TBs, fuel rails, etc.

 

That combo would probably gain low end to mid-range, but hurt you on the top end. I really think that GM just made an inferior intake with more volume and a bigger TB opening because the normal vehicle buyer would not know any different. They were going to de-tune the car one way or another, so why not make a crappier (and cheaper) intake for the car? Since the LS2 has more displacement, it makes good use of the increased volume even though the flow characteristics probably are not as good as the LS6. Booo.

 

I believe it was partly price driven also! The LS2 intake cost GM significantly less money than the LS6 intake. They found the cheapest supplier to manufacturer this intake, BTW it is a different supplier than the LS6. I have seen some dyno tests and the LS6 intake made more power from about 3500 to 5900 and they were dead even at 6000 --- all on a stock LS2 engine!

 

Got a link? Never heard of anyone swapping an LS6 intake onto an LS2.

 

An R&D company that I do business with tested this for some packages they are quoting for some special off-road type vehicle (more than likely a government vehicle). They had complete brand new LS2 engines from GM and as I understand they were already using the LS1 engine with the LS6 intake and the 78mm cable driven TB on previous vehicles. I have a paper copy of the results. Been at work all day, so as soon as I get a chance I will get this info up.

 

Here are a couple of dyno tests:

http://www.gearchatter.com/viewtopic11052.php

and here are some of the LS2 intake on an LS1 motor:

http://www.gearchatter.com/viewtopic10974.php

 

Any chance that they may test the TPIS mod'd intake or the FAST intake with 90mm Throttle body on that LS2 motor? I wonder if the LS2 intake works better on heads/cam LSx motors than the LS6, or if the LS6 still has the advantage? The torque gain across the board makes the mod a very good idea. Are there any issues on getting the LS2 fuel rails and injectors to mate up to the LS6 intake?

Todd

 

No chance on the TPIS test -- it is their time and money and they completed the testing for that application.
IMO if you are going to get serious about your cam and heads (something bigger than 230-deg at 0.050") and you are trying to make big numbers and hit the race track with some low ET's, then the FAST is probably the way to go. If you do not want to spend the bucks for the FAST, then you definitly want the LS6. I think the LS2 is a bust!
You might check with the guys over at SDPC (Kris) about using the LS2 fuel rails and injectors. I know you would need to change the o-rings on the LS2 injectors -- there may be more

 

We have a link you can go too regarding some testing we were involved with regarding LS6 VS LS2 INTAKE TEST. www.gearchatter.com
check it out!

 

So... on my LS1 with my LS6 intake, I can use OEM LS2 fuel rails with my LS1 fuel injectors? That's what I'd like to do anyway.

 

Yes, but you have to use spacers on the fuel rail because the LS1 injectors are taller then the LS2's. You will also need LS2 injector o-rings.

 

Thank you, good sir!

 

you also have to extend your map harness because the sensor is located on the font of the intake ware on the ls1/ls6 intakes is on the rear