Gti-r itb--q&a

[KOUKI_VERS13]

Being that GTI-R ITB's don't have an IACV, a PowerFC (L-Jetro, if it matters) should be able to stabilize and keep a constant idle on an SR, with the said manifold, yes?
UPDATE--So I've read that you can adjust the throttle so that the butterflys are left ever so slightly open so as not to die out on engines without idle control valves, so I thikn that solves this first question.


Anybody have a close-up picture of their vacuum set-up on an S13 SR with the GTI-R manifold? Would a vacuum manifold help in ease of set-up? I see a whole mess of vacuum ports on the manifold, and I'm wondering where they should go, and if any are obsolete on the S13 SR.


If I remember right, the GTI-R motor uses top feed, low impedance injectors, correct? Which means that I would have to get a resistor to lessen the "signal" to the injectors?
UPDATE--I found the answer to this one. I WILL have to run a resistor if I am to run top feed low impedance injectors, which of course I will and have to.

The manifold I have is already modifed to fit SR, but it's these odds and ends that I need to clear up before it's bolted on. Hopefully this is it, but I'll add more if I think of anything else.

[KOUKI_VERS13]

Anybody have anything to add or correct upon?

[florante rea]

hit my boy smelly240.

[smelly240]

gtir itb's DO HAVE AN IACV!

there are 2 big ports on the bottom of the itbs - the IACV goes to a t and then to those...

The GTIR has a vacuum manifold stock - so if ur getting it all off a gtir - you'll have it.

i use a golden eagle vacuum manifold, and i made a plate to mount on the stock s13 sr iacv - because the gtir plug is different. I'm putting a new engine in the car sunday - so if i get it back together I'll take pics of it - but to explain it all in detail - here you go...

::::::::GTIR vacuum stuff for those who didnt get the manifold with the airchamber (thats what nissan calls the "vacuum manifold")::::::::

ok - to start - the barbed fittings on the itbs - those can either be t'd and then sent to the vacuum manifold - OR - I recommend just running each one a line directly to the vacuum manifold.

Then - the other ports on each throttle (non barbed) those are for balancing the itb's - they get capped and ziptied.

the bottom of the ITB's have a hose connecting them - thats for coolant. they get the coolant that originally went to your TB of course.

Then we have the nipple on the plenum - thats the oem location for the boost source for the wastegate - i in fact use it.

ok - now to the IACV - just take a stock iacv gasket and cut a square plate out thats bigger than the gasket - then mark it and drill and tap it for the bolts that attach it - then what i did was drill and tap a 3/8 NPT hole(where the opening is for the iacv) for a barb fitting - then screw in the barbed fitting in - and slap it on a belt sander to make sure its flat and bolt the iacv to the plate... stick a bracket to it where u want it - and viola! u have iacv that plugs right in. The barb goes to a t and those go to the big ports on the itb's bottomside.

remember - the tps wires need to be flipped with the gtir tps on a s13

dont forget to provide a port on your vacuum manifold for the fpr, boost gauge, and the one on the end should goto your brake booster. The throttle bracket will have to be custom also.

I cant take pics bc the motors half outta the car so it can go into JR's (floranterea) car - but the built motor should be in sunday or early this coming week. I'll take pics as soon as its back together.


Your best bet for resistors for topfeeds is to use a 4cyl accord or EF9 resistor pack. I made a unpluggable injector harness to go with mine.

[KOUKI_VERS13]

Thanks for the answers. If and when you can, pictures will definitely help.

About the vacuum manifold, you say that I should run each line off the barbed fittings from each runner to a dedicated port on the vacuum manifold. So (ideally), that would mean I would need atleast a 6 port vacuum manifold, being that I'd also be running two more lines, one to the boost gauge and another to the fpr.

I didn't think about making a block-off plate for the IACV and tapping it to run a line to the two barbed fittings on the underside, very cool. I think I'll do that.

I won't be running coolant through the TB's, so I guess I'll just them off.

There's a small nipple right near the tps side of the manifold, any idea what that's for? Is it some sort of coolant return?

The nipple on the plenum, would that be the one on the coldpipe side of the manifold, right on the flange?

As for the TPS, are you saying that I'd need to run a GTI-R type, and flip the wires on the harness side to match up with the change in sensor?


Thanks again...

[ZilviaKid]

Bumping this because im stupid and decided to undertake this project.

i see that the OP mentioned it, but would capping the IACV and opening the throttle work well enough? tons of people block off the IACV when you go to greddy manifold so i figure it should work well enough here right?