Split Pulse Gurus! Just Need An Answer.

[Daboss]

Just a quick question I need answered would there be any gain to putting a split pulse on this manifold.

Would it still work the same?

[The Dan]

No. And I'd be more concerned about the amount of time and money you will have to invest in the next 2 years continuously repairing it when it cracks.

[Daboss]

  Elite Racing said:

No. And I'd be more concerned about the amount of time and money you will have to invest in the next 2 years continuously repairing it when it cracks.

Exactly!!!! I told the seller the exact same thing that it would not work and I heard about manifolds like this cracking all the time. He assured me it wasn't so and that this would work on a split one.

[The Dan]

Yeah of course it will work. But it's not going to utilise the split pulse to it's full advantage

[MercuryMotorsport]

I the last month, we have replaced 3 such manifolds due to massive overboosting issues. I would get a refund and invest in a well made manifold to suit your application. You will also need a decent sized wastegate, something like a turbosmart 50mm. Spend a little bit more money once and you will reap the benefits in reliability, response and also power.

[Lithium]

Yep, everything that needs to be said has been

[Daboss]

  Elite Racing said:

Yeah of course it will work. But it's not going to utilise the split pulse to it's full advantage

I know it will work, but I mean as efficiently as a split.

  MercuryMotorsport said:

I the last month, we have replaced 3 such manifolds due to massive overboosting issues. I would get a refund and invest in a well made manifold to suit your application. You will also need a decent sized wastegate, something like a turbosmart 50mm. Spend a little bit more money once and you will reap the benefits in reliability, response and also power.

No I didn't buy one I was just looking into it and didn't agree with somethings he was trying to tell me, so I came here for more opinions and direction.

Thanks man this forum is the best.

[STATUS]

  MercuryMotorsport said:

I the last month, we have replaced 3 such manifolds due to massive overboosting issues. I would get a refund and invest in a well made manifold to suit your application. You will also need a decent sized wastegate, something like a turbosmart 50mm. Spend a little bit more money once and you will reap the benefits in reliability, response and also power.

this and all the stupid high mount SR20 ones.... all junk.

[juggernaut1]

I think you'll find there will be a mismatch....split pulse turbo housings have a different footprint to an open housings (split pulse are wider to account for the divider). Therefore, there will be a mismatch when you bolt on a split pulse turbo to a single scroll manifold flange. Have a look at the back of a Garrett catalogue for the measurements and you will see what I mean.

Edited September 8, 2010 by juggernaut1

[TiTAN]

just spend the money on an ETM/6boost/full race manifold, they are excelent bits of gear.

[josip]

this manifold lasted 3 1/4 mile runs running 10.1 @ 135mph, then I replaced it with another one, detuned for street went to calder park, done 4 runs on 24psi and it cracked again. spent $1350 for a custom split pulse 6boost manifold and never looked back. I lost over 1k fixing and upgrading this stainless steel pos. stay away if you want big power

[hypergear]

For those manifolds you need to:

1x slot 2x bolt wholes in the center so they can fit your engine head.

2x Machine the manifold faces flate or they will keep on blowing your gasket

3x Re-enforced the welds at the collector.

It will workd fine after all that. Unless you can do all that your self, or it Cost more then the actual manifold.

[Daboss]

With a split pulse does it need to be t4 flanged or will a t3 do as well? What size turbine housing split pulse would you use on a rb25det, with a gt35r?

[juggernaut1]

You can spec the manifold in T3 split or T4 split. I would use a 1.06 T4 split housing on an RB25. Althought the housings from ATP aren't the greatest castings - so will probably need a little tidy up if you can be bothered. Someone on this forum used a T3 .78 split on an RB26 (can't remember name) with a GT35 and got close to 400rwkw.

Edited September 12, 2010 by juggernaut1

[s13_Skyline_inside]

they dont have a different footprint, ive got a t4 flanged non split pulse manifold with a split pulse t04z and they line up perfectly the actual size of the flange is the same

[GTScotT]

  s13_Skyline_inside said:

they dont have a different footprint, ive got a t4 flanged non split pulse manifold with a split pulse t04z and they line up perfectly the actual size of the flange is the same

Are you using it like this?

A single entry manifold mated to a twin scroll turbo is bound to cause some serious restrictions.

[JonnoHR31]

  juggernaut1 said:

I would use a 1.06 T4 split housing on an RB25. Althought the housings from ATP aren't the greatest castings - so will probably need a little tidy up if you can be bothered.

just finished fitting myne and it was the hardest job i've ever done, the physical size of the housing makes doing up housing bolts and oil/water feeds near impossible, ended up having to leave one of the compressor housing bolts out because even when fully tightened it fouled on the turbine housing flange in the position i need it. the design leaves a little to be desired but it should work alright, will see how it goes shortly.

[juggernaut1]

  s13_Skyline_inside said:

they dont have a different footprint, ive got a t4 flanged non split pulse manifold with a split pulse t04z and they line up perfectly the actual size of the flange is the same

T3 split & T3 open have a different footprint.

Edited September 13, 2010 by juggernaut1

[Daboss]

Hey there just want a definitive answers from people who have tried and what there suggestion is and why.

I have re posted to ask a quick question, I already have a 35r and was wondering to get 350-380rwkw what would you guys go with t3 or t4 split pulse and what back housing .82 or 1.06? Right now I am on full boost by 4200-4500 which is laggy to me, use to running with a stock turbo, and would like for it to either remain there or make boost sooner. Just do not want it to be laggier.

So what combo would you guys suggest?

[Lithium]

What housing and power do you currently have??

I haven't seen the combo on an RB25 myself but from what I have seen on other cars I'd go with a 1.06a/r T4 Twin scroll housing... I am guessing you have a .82a/r hot side from that spool level, so maybe shift that to around 3800-4200rpm range for a twin scroll setup with generally more torque as it builds boost and more midrange at full boost. Just a semi-educated guess...