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HKS Turbos

Roy

By Roy,
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Roy Grand Master

Roy

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Im now at that stage where im after a bigger turbo. At the moment im looking at three options

1. HKS 2540 - ive heard that in twin form these arent any better than 2530 on GTRs. Are they a good thing on an RB20DET (internally stock) OR like the GTR should you stick with the 2530.

2.HKS 2835 (internal wastegate type) This is my ideal preference at the moment but not sure if it will have sufficinet clearance on the stock manifold. Dont want to go to aftermarket high mount cause that will mean major revisions to inlet piping.

3. High flow factory by GCG.

Realistically i think i will go for the 2530/2540 , do these match factory oil/water lines or do ther require modification...people claim bolt on.

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Roy Grand Master

Roy

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With the turbo comes a Bosch 044 fuel pump, surge tank & Mazda 550cc injectors (13B) with the factory computer re-tuned. Looking for about 220rwkw.

However when budget permits for some internals would like to have some redundancy and be able to get more hp without the need to again change the turbo.

Looking for a strong/ reliable (track days) engine that doesnt make power simply because of huge boost. Needs the tractable for slow 2nd gear corners, ie boost at 3000rpm

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meggala Grand Master

meggala

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you are then going to need size and a ball bearing center. the hiflow is good for around 450 possibly 500 hp with the right combo. don't hope for much boost below 3500 If you want to make power up high. the stock internals with the right injectors

afm can handel 250 rwkw possibly more with a metal heads gasket . but on the track I would be looking at the 220 you nomiated. for reliability.

cams are another way you can gain some good power around a 260o apexi one seem the way to go you can also get your turbo spooling earlier by doing the heads.

I would be thinking may be a hi flow stage 2 from gcg and use your ecu cams and head work to lower spool times this will make very good power 250 rwkw is very achiveable.

the hks turbo would be good the 2835 is the best one but I have only seen them on cutom manifold. have you considered an exter waste gated turbo and these hold boost better and tend to wok better you can get a custom low mount turbo manifold made to suit.

cheers

meggala

I did quite a bit of rescearch in to this and in the end I threw my arms up and grabbed an rb25 turbo.. I can be very confusing.

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Roy Grand Master

Roy

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AFM, i thought the one std on RB20DET was 80mm unit, the same as 300ZX. Is there any advantage to changing AFMs.

As long as its 0 vacuum at 3000rpm and starting to boost id be happy. GCG offer BB rebuild for $2100. I like the idea of a cammed 2L turbo screaming outing some revs.

On a slightly different note, as far as aftermarket internals, like rods, i know they are stronger, but are they much lighter than balanced shot peened, linished originals. Coming from the old school 427 V8s i have to believe Jap engines require blueprinting even @ 240rwkws if they are going to be truly reliable over a duration longer than a few months.

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Guest TTZ32

Guest TTZ32

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The Zed AFM has a higher range ie you won't max out the output of it with greater airflow, but it has less resolution because it's still a 0-5v output.

Jap engines are very well built and balanced, as an example the VG30DETT in the Zed has forged rods and crank, the cranks are factory balanced using mallory metal, and the factory uses 3 grades of std bearings to achieve the best clearances, I would think the RB20 would be built just as well, and if you torch it........by another from a wrecker:)

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  • 1 year later...
Roy Grand Master

Roy

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...Dont want to go to aftermarket high mount cause that will mean major revisions to inlet piping.

...

lol...how things change... then again some things dont, im still a tight a55 and dont know what im doing.

You must be bored Doughboy... go practice your burnouts so you can run an 11 :rofl:

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