Intake manifold mod

spetz · Post by **spetz** » Mon Aug 07, 2006 3:46 am

Just letting people know that I am modifying my intake manifold and wanting to hear peoples opinion on this

This isn't a definate go (need to wait see what cost is) but this is the plan:

Unbolt the plenum off, cut the runners 4cm shorter or so, and weld on a new high flowing plenum on a ported 65mm throttle body with original match ported and polished runners.

So, runners will be shortened (more peak hp)
Butterflies for short/long intake will be thrown away (less restriction I hope at high rpm)
plenum designed for better flow and more equal air distribution between cylinders

FTO338 · Post by **FTO338** » Mon Aug 07, 2006 9:37 am

Well it would be interesting to see the finish product & dyno before & after install. What sort of cost involve?

Keep us up to date & pics would be good

kid_dynamite · Post by **kid_dynamite** » Mon Aug 07, 2006 11:09 am

Planning on testing it over a flowbench (stock v. modified)? That would be neat

SG · Post by SG » Mon Aug 07, 2006 1:33 pm

might get heaps of low rpm torque loss afaik, maybe faster revving though so it gets past the 'flat spot' quicker, but just guessing

bad for fuel consumption while going slow, but might also go well with multiple throttle bodies / 6 pack throttle bodies.. as they're supposed to have super instant throttle response i thinkg.....

spetz · Post by **spetz** » Mon Aug 07, 2006 3:14 pm

Yeah it will be benchflow tested. Unfortunately the runners are already ported/polished
But no before and after dyno results

I am finding out tomorrow the cost of it. The mechanic said "should be a few hundred bucks" so it depends on the price if I do it or not

Low end torque I was expecting, but not overly fussed about it

Actually considering I might get a new plenum I was thinking of running twin TB as well. Can 2 4G15 TB be made to work? One on each end of the plenum?

Without full standalone computer (using blue emanage)

barfy · Post by **barfy** » Mon Aug 07, 2006 7:40 pm

Ring RPW they do a swap over

B16REE · Post by **B16REE** » Tue Aug 08, 2006 1:18 am

I will be getting the RPW ported intake with 70mm TB so i can let u guys know what its like in a few weeks

spetz · Post by **spetz** » Tue Aug 08, 2006 1:40 am

I think 70mm on a stockish engine is overkill

You still want air to be going in with speed/velocity

ruffryders_sohaib · Post by **ruffryders_sohaib** » Tue Aug 08, 2006 7:09 am

RPW do 6packs, but i dont think they are for fto's, does anybody know if they do one, or anybody that does??

spetz · Post by **spetz** » Tue Aug 08, 2006 2:49 pm

I think they do them on order only