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R34 Neo Highmounts, Cross Over Pipe To Std Inlet Manifold

msports180

By msports180,
in Engines & Forced Induction

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msports180 Mentor

msports180

Posted
Posted

I did a search but couldnt find any info or photo's.

What have people done with a Highmount turbo utilising the stock inlet plenum?

Looking for some idea's with what to do with the cross over pipe?

Have people used the Std R34 throttle body? Or gone to the smaller R33? Has that presented any problems with the TCC?

I would rather not go to the expense of a different plenum.

GTSBoy Grand Master

GTSBoy

Posted
Posted (edited)

Well, if you're still running TCC then yes, removing the TCC butterfly will put the system into a spin. Not recommended. Even if you were to delete the TCC stuff altogether (including the TC control unit) then the ECU would chuck fault codes. You'd have to put a Nistune into it to get rid of those.

The most minimal option would have to be to get rid of the cast alloy crossover and build a new crossover pipe that wasn't as long as the original one, so that the part that runs over the exhaust manifold area was moved closer to the centreline of the car (somewhere over the cam/coil covers). You'd probably end up having to relocate the BOV, might end up with the pipe being high enough to hit the bonnet (or maybe not), etc etc. But would be doable. Some good thermal wrap and reflective insulation and a good turbo heat shield would all be needed.

Others (not so much on Neos, but certainly on R33s and R32s) have put curved crossover pipes on that bring the return air up on the driver's side, over the front end of the driver's side cam cover. The picture that jangles just posted is a prime example, but I reckon it is a shit idea, as the flow will crowd the outside of the bend and will end up with bad distribution going through the TB and into the plenum. There's a whole thread on this stuff you should look at if you haven't already.

Edited by GTSBoy
msports180 Mentor

msports180

Posted
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I have a Nistune for it, can I remove the TCC and tune around it with a Nistune?

I was wondering if I'd have clearance around the bonnet to make a shorter pipe like the alloy one? I'm just trying to get an idea while I'm waiting for all my bits to arrive.

GTSBoy Grand Master

GTSBoy

Posted
Posted

Put a big lump of plasticene on the exhaust side cam cover that sticks up nice and high, then close the bonnet. Open bonnet and measure the height of the blob. That will tell you how much clearance you have to fit a pipe there. Try a couple of different spots along the cam cover because the clearance won't be the same everywhere.

As for the Nistune, if you kill all the TC gear, then you will need to get a Stagea image put into the Nistune board. Stageas have no TC, and so they get no TC fault codes. I actually have to go see Matt to do this to my Neo ECU this week. Neo in R32 has no TC, but the ECU is upset because it has no comms from the TCU and the TC butterfly doesn't do its open-close-open routine at startup.

Hanaldo Grand Master

Hanaldo

Posted
Posted

As for the Nistune, if you kill all the TC gear, then you will need to get a Stagea image put into the Nistune board. Stageas have no TC, and so they get no TC fault codes. I actually have to go see Matt to do this to my Neo ECU this week. Neo in R32 has no TC, but the ECU is upset because it has no comms from the TCU and the TC butterfly doesn't do its open-close-open routine at startup.

This.

Not actually all that hard, though I'm waiting on my tune next week to see how much of a difference it makes. Lack of TCS has been giving me headaches for years now. Your other option is to just trick the ECU into thinking it is receiving a signal from the TCS, though I think it would be easier to get the Stagea image uploaded. I also think you will find it impossible to do fit a high mount turbo setup in with the cooler piping with the TCS butterfly still in place, the damn thing just takes up so much room. Unless you had a very sharp angle that messed up your air flow.

I agree with GTSBoy on this though, I don't like the design of that piping with regard to air flow. You would be much better off just switching to a forward facing plenum, though having just done this myself I understand about the expense side of it...

32TAXI Experienced

32TAXI

Posted
Posted

Search secret squirrel in stagea thread - should be able to fool standard ecu or nistune in same way.

We use a R34GTT Powerfc in RS4S neo manual stagea's and fooled the ECU by having default tcs signal of 2.5V to ecu (pin 54?)

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