32 replies to this topic

[svanh1993]

Hey guys satria is still going strong from my custom home made kit just wondering other than standard cams what is the best to get more flow out of the standard 4g93p heads my turbo is at full boost 13psi at 3800rpm I'm not looking at changing rear housings just seeing what I can get with my current set up 2nd gear is where she comes alive due to my big cooler and piping I'll give you's a quick list
Satria gti 2001 4g93p
Home made log style turbo manifold
T25 gt2871rs running a dual boost setup 8 psi low and 13psi high boost
Evo 2 ecu
609 maf
550cc injectors
Tog sr20 gt2871 3 inch stainless dump modified
450x250 core aluminium front mount intercooler
63mm internal hot side cooler piping
70mm internal cold side piping
70mm throttle body
Oil cooler and filter relocation kit
Speed flow fittings and all aeroflow 200series stainless steel braided hoses for oil cheers guys

[caged]

Too late now but i would of gone 60mm throttlebody with 2 1/4 hot side and 2 1/2 cold. Just wind the boost up.

[evo-gsr]

Yep...more boost!

[evo-gsr]

Why do you have 2 boost guages?

[Cranked]

Cos race car....

[jack be nimble]

This is still a high compression gti engine isnt it? Std rods and pistons.
You have to be close to breaking those rods if so. Get some decent rods in it and boost away

[evo-gsr]

Cos race car....

Oh yeah..forgot about that.

[OLDIE]

Why do you have 2 boost guages?

 

It could be that one is reading pressure before the IC and the other IM pressure  to check pressure drop.

[jack be nimble]

Or maybe pre turbine pressure?

[svanh1993]

One before the intake off near the waste gate and one at the intake manifold funny thing tho she doesn't drop pressure haha

Still the question tho how can I get more flow out of these standard head or intake mods are there any extra things I can do ? What's the best cams if that's an alternative I know stock is ment to be fairly good and high lift cams won't work well with my turbo setup but just wondering what other things I could possibly do to get more out of her yes I will be forging her lol

[CLuTZ]

I think you should forget about maximum flow for now and worry about efficiency first.

[caged]

Am i missing something here?? You run 13psi high boost and are talking about getting more flow through the head. See how it likes another 5psi first, maybe ramp it in after 4800rpm being a 93.

[CLuTZ]

Am i missing something here?? You run 13psi high boost and are talking about getting more flow through the head. See how it likes another 5psi first, maybe ramp it in after 4800rpm being a 93.

 

He's running a high comp N/A engine

[jack be nimble]

I think a lot of % flow can be gained at low valve lifts. This will be from 5 angle valve job and smoothing the transitions. But the basics of a good valve and port work are readily known.
there is alse a little less used theory of smaller ports and supersonic flows. The sprukers for this train also have good test results from seemingly undersized ports.

id be looking at the good valve job and blend, port match and smoother runners.
You may be able to split your cams a bit to change their characteristics. Thinking they are na cams they maybe running a bit too much overlap for a turbo. Jasma do g93 cams

[caged]

So whats the comp, 10.5:1? Id still ram boost into it. You could go bigger cams and try loose some dynamic compression or if these have the paper thin 93 head gaskets then change to a thicker oem turbo gasket. Or even water meth or flex fuel for high boost. I wouldn't waste time porting the head or 5 angle vale jobs,boost is only a restriction. You may flow what you did at 13psi now at 10psi but at the end of the day that high comp motors still injesting the same air you may just feel better thinking the boosts lower.

[jack be nimble]

I agree caged^ but i was addressing the op question. More boost is the go, but forge it before it pops if you can.

[svanh1993]

Well fuel efficiency is brilliant 7.5litre per 100km on the highway at 110kmh and 10.5 max in town cause boost is fun but looks like more boost may be better ?

[jack be nimble]

More economy can be had if you run in closed loop and use your wideband. You should be able to run a afr of near 16:1 to get 10% better economy. This only applies for a lean cruise. Lean it out till it surges and then richen it a touch

[svanh1993]

16:1 isn't that going to be to big AFR with 10.5.1 compression and almost running 550cfm out of my turbo on the factory evo 2 ecu

[GSR]

as he said, 16:1 only applies to lean cruise..