intake manifolds

[hardcoreep]

There is no restriction in these turbo manifolds as they are basically just a hole once cut.

We've been using these 4E NA manifold for years now, so I don't know where to even look for dyno sheets. What I remember is that the NA manifold in its standard form capped top end power because the surge tank area is smaller than the turbo intake manifold. Basically as boost increased the manifold could no longer hold the volume. To counter this problem one of the users, mt friend, came up with a design solution, extend the surge tank to the same volume as stock. The result is that it can handle higher boost levels, but the runner design still dictates the powerband. It is not an issue of throttle body. Big turbochargers like expansion area and that manifold doesn't provide it.

You must forgive the lack of recorded data, but this stuff is rather old to us. Most of us have moved past this stage years ago. My final test of the NA intake manifold was in 2001. These two manifolds are for cheap 200whp street set-ups, proven, and everyone runs them.

 

[Toyota T23]

Do you have dynos ?

 

[hardcoreep]

Do you have dynos ?

We have four. One four wheel dynojet used for race/rally guys and three two wheel dynojet. Three were installed by dynojet themselves. The fourth was installed by dynojet, but moved and reinstalled elsewhere. Two are in our capital city, one is in the middle of our island a mile up on a mountain top. And the fourth is on the opposite end of our island. We're pretty covered when it comes to dynos.

As I said its not a matter of never dyno testing them. We all did, which is why we use them, but they are just standard items now. To look back for six years of dyno records to find the test with those manifolds would be a job, to which I'm not even sure those dyno records still exist.

 

[Toyota T23]

Well not that is is very importnent, because it is only my wintercar.

But i still think bigger throttlebody would make the difference, and plan to try it.
But if i realy wanted too go for high end power, i would make my own manifold, and not try getting the best of a stock 5e mani..

 

[hardcoreep]

I've seen up to a 4AGE throttle body used. It makes very little difference in powerband. It simply increased the power figures. Same graph only slightly raised. On the HRF car which makes 430hp they use the 4throttle intake manifold from the SR20DET GTi-R. I've seen up to 300whp on the stock manifold with stock level powerband.

 

[Toyota T23]

And getting bigger plenium make BIG difference ?

 

[villen25]

It only looks longer. I know the guy who made the first one. He uses them on all his cars. Everyone else is just a copy. The stall doesn't damage anything it just means no more air can enter the engine. You blow off valve will get real loud.

Yes, we modify the 5E NA exhaust manifold to hold a wide variety of turbochargers. Its cheap, flows better than the 4E turbo manifold, and cast so it doesn't break.

Im kinda lost now...

 

[Toyota T23]

Im kinda lost now...

I am sorry villen, didnt mean to get you confused.
You vill be fine with that mani

 

[hardcoreep]

And getting bigger plenium make BIG difference ?

As HRF explained, Yes. More surge area means more space for the compressed air to be held. Basic fact of turbocharging. You can look at the Veilside intake manifolds for their r34 and Supra that support 1000hp.

 

[Toyota T23]

As HRF explained, Yes. More surge area means more space for the compressed air to be held. Basic fact of turbocharging. You can look at the Veilside intake manifolds for their r34 and Supra that support 1000hp.

Yes i am aware of those manifolds, but cant se how that small exstention could make BIG difference.
But never mind.

 

[NosydneW]

Big difference is obtained due to what hardcoreep said. more space to hold compressed air.

 

[Stealthseo]

I just got a turbo pretty much "how-to" book. its called maxium boost. more then length and plenium area size, diameter of the tubing is a huge factor. with smaller tubing huge back pressure causes the air to blow off slower and "dead" air to sit in the plenium to be wasted out the BOV.

 

[Toyota T23]

Like i said, i know a bit about manifold, made some myself and tested different kinds.
But still cant se how that small extention could make BIG difference(like to se dyno).There are many things i would do before that.
But ofcourse people are different.

I keep adding fuel past 6000rpm on stock cams, then the flow must be ok

 

[hardcoreep]

I keep adding fuel past 6000rpm on stock cams, then the flow must be ok

No one is saying flow isn't past 6000 rpm. What are your power peaks.

with smaller tubing huge back pressure causes the air to blow off slower and "dead" air to sit in the plenium to be wasted out the BOV.

Exactly, the air begins to 'stall' because it has nowhere to go and you end up with a very load BOV.

 

[steve0]

has anybody got any different intake manifolds on their cars such as the 85mm.

what sort of gains can i expect from doing this on a 4efte?

 

[slostar]

85mm?

you talking intake manifold or throttle body?

 

[HYBRID]

i think that would be throttle body... but still 85mm is overkill imho...

 

[steve0]

different intake manifold and larger throttle body as they both go hand in hand really.

why is that overkill?

has anybody actually done these mods?

 

[gorganl2000]

a lot of people run the stock manifold well up to 250whp.....some go 4age throttle body and some use nissan ones..........but for most the stock unit is not really a restriction unless u are searching for BIG power (maybe 300hp)

 

[Nick@TD.co.uk]

I'm looking into aftermarket intake manifolds for the 4e can't find many, i've seen dave can get one at £500 and another company did one but that was same price, does anyone know if daves price includes the throttlebody as well?

And also is the standard throttlebody 60mm?

Cheers
~Nick