I'm getting the 90mm LSX intake and TB on my h/c car.

My question is, wouldn't they both be unoptimized if I have a stock MAF sensor and small opening aftermarket lid?

Would I see a large benefit going to an 85mm TSP lid and 85mm MAF?



....and I just realized I posted this in the wrong forum

 

If you only have a 75mm lid and a 75mm MAf then guess what... You are only going to flow 75mm worth of air. It is like a virus one thing keeps leading to another. Next it will be injectors then more tuning then more traction... When will it ever end

 

From a good source I was told not to get the 90mm intake for a 346CI and that you should have at least 400 CI to use it.I could have had a 90mm but will wait for a 78mm version.

If you use anything less than a 90mm TB on the 90mm manifold it seems to me that a restriction that could cause turbulance would be possible.[this was from the same source]

 

Just like they say.... The flow is only as good as the smallest opening. The 90MM is usless when it has to come through a 78MM opening.

 

I planned ahead and already have the 85mm TSP lid and maf. As said above, it would be pointless to have the 78mm maf with the 90mm TB and intake.

 

What about a Heads cam package with 450 rwhp, stock cubes, and the Vette 85 mm maf? would it be worth the bigger one or would the small one be good enough?

 

Sorry, this "source" is clueless! GM would not have spent millions of dollars redesigning the Gen IV and put a 90mm TB on it if it didn't work or made more power! Let's get serious here!

 

Looks like an adapter will be needed to even bolt a stock TB to the 90 mm intake and to compare the brand new GenIV,6 Liter,aluminum motor with its 90mm TB to ours is a "clueless" comparison.

 

Would going 85mm lid, 90 TB and 90 LSX help an otherwise stock heads/cam 346.....or would all of this extra air be useless as the heads can suck in that much air? I suppose it couldn't hurt...right?

 

just don't expect 20 hp gains, it will probably help you in the high rpms i suspect that's it. Certainly not worth the money. This product has to prove itself first.

 

not entirely "usless" .......while the 90MM TB will never get more than 78MM of air due to the smaller opening being a restriction, the larger bore of the TB does cut flow loss due to frictional loss....

- if everything is 78MMs in bore, you "might" only get 70MM (just a number....) worth of air to the engine do to the entire intake's frictional loss.....

- with the larger TB and intake manifold, you will still never get OVER 78MMs (without some really good valve events or FI) but it would stand a better chance of getting your full 78MMs worth of air....


in other words the 90MM is not useless, but it is not being used to capability (if it even would be on a H/C car) and thus might not be worth the cost over the smaller TB setups.

get what I'm saying?

 

Its probubly not worth the loads of money (though it is bound to make "some" extra HP). I know my 80MM BBK gained some strong BUTT-O-METER HP over my ported stock TB.

It can't hurt HP because the entire path the air travels before it reaches the runners is just restriction. For max HP you would have no intake manifold at all but rather just 8 little runners with a butterfly in each (a hilbord style setup).

 

I decided not to spend the extra $500 on the TB, $80 on the bigger intake, $120 or whatever on the lid, and $100 or whatever on the MAF.

Not worth a minimum $800 for an extra 5rwhp on a stock cubed motor. I can always sell this smaller lid when I go big.