with 10:1 compression, cam, and stage 3 GM pulley, the LSJ will make a hair over 300hp, there is a lot of other work that can be done too, but the M62 sure can support or make over 300

its not the intake manifold

GM did all of this in there LSJ build book and its on CED.com, not sure why this is such a big argument, it can clearly be done and there is a "HOW TO" from GM

when my SC build is done, I'll show you

 

As far as the cams... although re-grind, the 272's and GMR's both seem pretty promising, with any amount of patience.

As far as the head... I'm all for custom... but some companies 'claim' incredible gains off their port job... others are more reasonable... but none the less, it's an improvement of some kind.
The sad thing, though, is that I have yet to see a head with a port job optimized for an SC motor.

 

i will post dyno numbers before and after the head. we shall see what m2race can do

 

huh let me know how it turns out.. i was thinking about using them down the line since they're close to me

 

will do

 

umm... the honda motor your talking about has a higher compression ratio and a better flowing head...

 

way to be on top of things

 

Lol, upps But its the truth

/End thread

 

On a roots blower? That doesn't really make a whole lot of sense. Your temps will be higher vs. the stock manifold (presumably) and the routing wouldn't be direct (blower-->pipe-->intercooler-->pipe-->manifold vs. blower-->manifold). If you use the stock manifold it will still be a bottleneck.

If you use a centrifugal then it makes more sense but not really because a centrifugal doesn't heat up like a turbo because it's nowhere near the exhaust (you could probably get away with using the stock i/c system)

 

a risk you have with an air to air setup on a roots is by having the throttle body still bolted to the blower. if a charge pipe was to leak you will run rich (losing air passed the maf) or if i pipe blows off you have no throttle controll, its wide open. if you put the throttle body on the manifold after the blower, be sure to run a blow off valve as you dont just have pressure build up for a second like a turbo, it compresses air all the time.

 

no way my temps will be higher. im betting i could get rid of my laminovas all together gut my intake manifold and run it straight through and get lower temps.
it will go more like blower-intakemanifold-pipe-intercooler-pipe-intakemanifold-engine, the stock intake manifold will be just a shell of its original self and will not be much of a problem, im still trying to figure out what to do about making the runners longer and not hurting flow. thats a challenge

 

Runners are not possible with the stock shell. There just isn't enough room to do anything beneficial.

 

If you do some research on engine design, you'll find that the inlet (runner) design has a big impact on the engine's breathing behaviour. (Off course head, cams and exhaust do too.)
In an NA application it is much more important, but the principles on proper runner design are the same for NA or FI applications.
(I think that idling and low end behaviour of more agressive cams can be improved (a lot) with some proper runners in the LSJ's inlet tract.)

Do the turbo guys not have some comparison data on a turbo set-up with stock (gutted) LSJ manifold vs. the Hahn manifold with runners? That would give us some clues...

 

The stock LSJ IM is not the problem.

 

... I'm just gonna re-post this... in case some people missed it.

 

yea but if you open up that head and leave stock exhaust, you didnt really go after the bigger culprit.

 

Yeah... on a bone stock motor (OEM), it's useless.
I'm referring to the average modded LSJ here; 2.7-2.9" pulley, intake, exhaust.

There are decent gains with each mod alone; head work, cams, IM.... but together, I think we will solve the 'problem' everyone is looking for.

 

im actually more curious what people's gains are with headwork. That will determine my next step as far as IM.

 

Rebel did some test;
https://www.cobaltss.net/forums/show...el+ported+head

I've heard from some other vendors that they might be on the high side... but it gives an idea.

 

i meant /w headwork done already,

test the new IMs. Otherwise its kinda like doing headwork with 1 inch exhaust. Its not really showing what it does.

 

Oh... no... not yet.
I'll probably take some data before and after the head swap, though.

 

I think we would be in for a suprise.

 

I'll be putting the GMR cams shortly after, as well.
I think all 3, combined with my new 3" exhaust will have good results. Especially since I'm flow tuning each bolt-on component to match the head.

 

definitley need to see a before and after with the IM then. That will speak mountains.

 

might be surprised with the gmr cams. heard someone had a huge problem with them