Turbo Choice

[JVP]

hey dudes.

im stuck with what turbo to chose on my car.

its an r32 gtst with the following mods:

FMIC

turbotech boost controller

bosch 040 fuel pump

K & N pod

Dr.Drift Remap running 14psi.

my aim is around the 190-200rwkw mark. i currently have 169rwkw with the above-mentioned mods.

im stuck in chosing these turbos:

Straight RB20 Turbo Highflow

Highflowed/Bored Turbine housing to fit larger steel/inconel Turbine wheel and shaft.

Highflowed/Bored Compressor Cover to fit larger alloy Compressor wheel.

This makes the Turbo Hi-Flowed both Compressor side and Turbine side.

The upgrade bolts directly back on the manifold and existing exhaust.

The housings are acid dipped and sandblasted back to new quality.

This is a journal bearing highflow and is capable of making 210-220rwkw and is rated to 18 psi max boost.

1 bar of boost is available from as little as 3000rpm.

Straight RB25 Turbo Highflow

Highflowed/Bored Turbine housing to fit larger steel/inconel Turbine wheel and shaft.

Highflowed/Bored Compressor Cover to fit larger alloy Compressor wheel.

This makes the Turbo Hi-Flowed both Compressor side and Turbine side.

The upgrade bolts directly back on the manifold and existing exhaust.

The housings are acid dipped and sandblasted back to new quality.

This is a journal bearing highflow and is capable of making 220-230rwkw and is rated to 19 psi max boost.

1 bar of boost is available from as little as 3400rpm

i wouldnt mind boost hitting me at 3000rpm, but then again, the rb25 unit would have more mid-range and top end, correct? for driveabilty and whatnot, what would be better suiterd to my needs, and mods?

any comments (good or bad) are welcomed.

thanks guys

jabba

[paulr33]

There is no difference between rb20 and rb25 hiflow. They get hiflowed to the same specifications. You can make boost come on earier, it all depends on intake setup, exhaust setup and state of the tune.

[Slide]

There is no difference between rb20 and rb25 hiflow. They get hiflowed to the same specifications. You can make boost come on earier, it all depends on intake setup, exhaust setup and state of the tune.

There is actually a difference.

The compressor cover limits the size of the wheel that can be used in the R32 turbo.

The RB25 turbo and VG30 turbo have larger compressor covers thus larger wheels can be used that flow more air creating more power.

The R32 and R33 turbine housings are also different in size but do not affect power as much as the compressor cover size difference does as for an example a stage 1 and 2 wheel can be used in all 3 turbine housings- R32, R33, VG30

[dead32]

hey slide, i got told when i bought my car that its fitted with a single turbo 300zx turbo (vg30) any distinct part numbers or something to prove the old owner isnt full of shit?

[JVP]

thats all fine and dandy, lol but it doesnt help me

[Munna1]

Paul is talking about the GCG highflow and is correct the internals are bored out to roughly the same size and rated at the same HP.

But everyone does there highflows different hence slides answer

where are you getting the highflow done?

cheers

Edited September 7, 2006 by Munna1

[JVP]

its from sliding performance.

[blitzxtr]

thats all fine and dandy, lol but it doesnt help me

just get a 3040R turbo from gcg after the cost to hi flow the standard your better of spending a couple hundred more & getting a bigger turbo good for 250 to 260rwkw

[paulr33]

you want to hit boost at 3 grand but are fitting a larger turbo?

those two don't match up and you'll likely add more lag.

specially choosing a gt3040r, don't expect much before 4500 ish

[blitzxtr]

you want to hit boost at 3 grand but are fitting a larger turbo?

those two don't match up and you'll likely add more lag.

specially choosing a gt3040r, don't expect much before 4500 ish

I had one on my r33 with the smaller exhaust housing to bolt on to standard manifold making full boost by 4000 to 4500 on 18 psi

[paulr33]

rb20 != rb25

[blitzxtr]

rb20 != rb25

TRUE

[JVP]

im leaning towards the rb20 hi-flow unit.

but will it run out of puff? spose it doesnt matter, coz im not gonna drag it in the near future.

sure the rb25 unit is more laggier, but it will obviously last longer.

i just want something with some get up and go,

i dont really want more than 200rwkw atm either.

so probably the rb20 unit.

[Munna1]

Have you thought about a stock RB25 turbo it will get you close to 200rwkw, its still ball bearing, and would have a lot less lag than the other 2 options

cheers

[JVP]

yeh i am thinking that too. but wouldnt the high-flow be a bit more reliable than a used rb25 unit?

[paulr33]

it wont fail, turbochargers are pretty reliable, unless given harsh conditions i wouldnt expect it to fail tomorrow. a 2nd hand rb25 can be had for around $400 to $500

[JVP]

ok that gives me something to think about.

thanks for your imput guys. keep it comming.

[discopotato03]

Yes I agree with Slide . I think he is telling you that the RB25 and VG30 versions use a larger diameter compressor wheel with a matching larger compressor cover . These would accept 70-71mm compressor wheels more easily than the covers on the smaller RB20 type compressors . This makes the RB25's turbo (housings really) a bit more flexible with compressor options . So in other words unless you want to stick with 60mm diametre compressor wheels ie dinosaur T3 wheels or a GT28BB cartridge the RB25 is the go .