Options For New Inlet Manifold - 100mm, Retain Itbs

[bigmikespec]

True...

Op should run 6 inch piping for efficiency.

Obvious sarcasm aside, there is a point (size) where it won't help anymore.

Put a pressure gauge at the outlet of the turbo and one on the plenum, the differential pressure is the pressure drop through the pipe work. Then do it again with the upgrade.

[r32-25t]

So it wouldnt be the intercooler giving the pressure drop at all?

[scotty nm35]

So it wouldnt be the intercooler giving the pressure drop at all?

Correct, the difference in pressure is likely the amount it is being cooled.

[bigmikespec]

So it wouldnt be the intercooler giving the pressure drop at all?

Yes of course.

Put simply, the least number of bends, shortest length and optimized pipe diameter will be best.

If your turbocharger is compressing the air to 30psi (example) you don't want it to be loosing 5-10psi through pipe work to get it into the cylinder head.

[Sub Boy32]

Can't help you with the decision of what plenum to run, but when I fitted my RB26/30 with a Greddy plenum I struck the usual/know problem of the clutch master hitting it.

I got a race car CNC guy to whip me up a spacer to allow me to run a S15 turbo, and have sold quite a few of these to forum members, let me know if you want one

[Sub Boy32]

[scotty nm35]

Yes of course.

Put simply, the least number of bends, shortest length and optimized pipe diameter will be best.

If your turbocharger is compressing the air to 30psi (example) you don't want it to be loosing 5-10psi through pipe work to get it into the cylinder head.

You seriously think you will lose 10psi through 80mm pipework at this power? No chance.

Some people just want it to look like they have a 2000hp drag car, and this I can totally understand. I just prefer finding out if the stock gear can get the job done before blowing 1000's on overnight parts from Japan, and I am confident it will in this situation.

The same can't be said about exhausts, these need to be as you mentioned, least amount of bends, largest free flowing pipes you can fit. Same with intakes really if you don't have to worry about defects.

[r32-25t]

This^^^

[bigmikespec]

You seriously think you will lose 10psi through 80mm pipework at this power? No chance.

Some people just want it to look like they have a 2000hp drag car, and this I can totally understand. I just prefer finding out if the stock gear can get the job done before blowing 1000's on overnight parts from Japan, and I am confident it will in this situation.

The same can't be said about exhausts, these need to be as you mentioned, least amount of bends, largest free flowing pipes you can fit. Same with intakes really if you don't have to worry about defects.

It is just an example, get your mate to put a couple of pressure gauges at the turbo outlet and at the plenum on his 600kW RB with stock pipe work and lets find out

Yep, some people like the look, others (like me) would prefer to look for every efficiency they can especially if they are building a turbo system with all custom piping anyway.

[scotty nm35]

Fair enough. I have designed and fabricated pipework on many high horsepower builds, and there are a lot of good reasons to keep the airspeed up. If you want to slow it down as much as possible, who am I to judge.

Just letting OP know the GTR runs one of the best intercooler pipe setups I have seen on a stock car, and it's capable of 600+kw in my opinion, as long as high boost is involved.

As for pressure gauges, it isn't telling you much about the pipework, only how well the intercooler flows and if it's cooling the charge nicely. Pressure readings mean nothing without temperature drop.

[bigmikespec]

Fair enough. I have designed and fabricated pipework on many high horsepower builds, and there are a lot of good reasons to keep the airspeed up. If you want to slow it down as much as possible, who am I to judge.

Just letting OP know the GTR runs one of the best intercooler pipe setups I have seen on a stock car, and it's capable of 600+kw in my opinion, as long as high boost is involved.

As for pressure gauges, it isn't telling you much about the pipework, only how well the intercooler flows and if it's cooling the charge nicely. Pressure readings mean nothing without temperature drop.

I agree it is capable of 600kW of flow... but that's about it from your comments.