Best Trade-off For Power/spool On Rb20

[falcon]

I am looking to upgrade my turbo to something that has a higher power output than the stock RB20 turbo. I track/AutoX/Solosprint my car, so I am trying to find the best turbo for that application.

I am aiming for 200-220rwkw, but don't want it to hit full boost (.8-1 bar) after 3500rpm. Currently my car hits 1 bar at 2900, with an FMIC and cat back 3'' exhaust.

I drove a GTR at autoX yesterday which is fully built with gt2860's and an R34 N1 block. The spool comes on WAY to late to even be competitive at the track.

So basically I am looking for the best trade-off between quick spool and power output. Obviously I will have supporting fuel/exhuast/ecu/internal mods for the turbo. I am just looking for turbo information, nothing else.

The one turbo that stands out atm is the HKS Gt2530 due to it's "bolt-on" feature and which apparently can hit 210ish rwkw. Does anyone run this turbo, and what kind of spool am I looking at with one.

Are there any other suggestions for an internally gated turbo for an RB20DET (HCR32). If I HAVE to I can purchase a new manifold, but if it's bolt on all the better.

Thanks!

[TTT]

Stock R33 turbo meets the spool up requirements, but not the 220rwkw requirement.

GT2510 is one I've heard of people using to make around the 215rwkw with near stock spool time. I think they are getting rare though.

then you get on to hiflows.

Sydneykid from these forums had a GCG hiflow on his RB20 track car for a while making 220rwkw on sane boost levels and I think the spool up time that you refer to.

that was a few years back though.

I think the price of a GCG ball bearing hiflow is around the $2K mark. and obviously will bolt straight back on to where it came off.

I'm not too sure on the other suppliers of turbo's and what they are like.

I guess maybe something in the GT28 type catagory would be suitable (but would require a manifold adapter or new manifold)

CEF11E - had an RB20 making 240rwkw using a cheap non ball bearing SLIDE PERFORMANCE HIFLOW turbo. but mas boost of 19psi was reached at 4100rpm if I remember.

he might have a dyno result in the dyno results thread.

[abu]

I'd recommend a HKS2530 or a HKS2535, HKS2530 if your wanting a quicker spool up

HKS2510 will probably make the 210rwkw or so that your after but it will be on very high boost, I'd probably got a little bigger turbo, slightly lower boost and gain a bit more up top, HKS2530 would be my choice

That being said, I'm currently running a HKS2535 with all supporting mods on 21psi at the moment on my internally standard RB20 and it doesn't feel laggy at all.. but I'm running cam gears as well with very mild adjustments

It boosts prety quick, revs hard to redline and doesn't feel laggy at all

[SimonR32]

Stock R33 turbo meets the spool up requirements, but not the 220rwkw requirement.

GT2510 is one I've heard of people using to make around the 215rwkw with near stock spool time. I think they are getting rare though.

then you get on to hiflows.

Sydneykid from these forums had a GCG hiflow on his RB20 track car for a while making 220rwkw on sane boost levels and I think the spool up time that you refer to.

that was a few years back though.

I think the price of a GCG ball bearing hiflow is around the $2K mark. and obviously will bolt straight back on to where it came off.

I'm not too sure on the other suppliers of turbo's and what they are like.

I guess maybe something in the GT28 type catagory would be suitable (but would require a manifold adapter or new manifold)

CEF11E - had an RB20 making 240rwkw using a cheap non ball bearing SLIDE PERFORMANCE HIFLOW turbo. but mas boost of 19psi was reached at 4100rpm if I remember.

he might have a dyno result in the dyno results thread.

gcg high flow looking at 5000rpm before you 5000rpm... laggy buggers

as said rb25 turbo will get you full boost around 3500 and around 200rwkw on 15psi

hks 2530 will get 200-230rwkw on 15-20psi with similar response

dont go a 2535, they dont seem to suit a rb20

[TTT]

gcg high flow looking at 5000rpm before you 5000rpm... laggy buggers

I doubt that very much

[R338OY]

ball bearing high flow

[SimonR32]

I doubt that very much

doubt away. dyno graphs say im right

[R31Nismoid]

HKS 2510 for the more response, 190-200rwkw type arrangement

HKS 2530 for 220rwkw tad less response from the 2510

Only two choices/turbos that perfectly fit what you want that i know of

[FATAZZ]

I got a quote from Pep's auto parts. they sell GCG stuff. quoted $1100 for a highflow

of my rb25 turbo. The GCG rep who works at Pep's said it's machining of the housings/new

ball bearing cartridge and blades everything except the oil & water lines.and will make 230-250rwkw

on rb20(so he said)

Sounds too cheap...any thoughts?

[paulr33]

considered diff gears?

4.3 or 4.5 might give you the level of acceleration you want with same turbo

you dont have to have more power to get quicker acceleration

[TTT]

doubt away. dyno graphs say im right

If your dyno graph shows no boost until 5000rpm on your GCG rb25 hiflow on an RB20, then you have tune problems.

look at all the other rb20 dyno results in the dyno thread.

there are much bigger turbo's and even r33 hiflow turbo's which produce numbers way before 5000rpm.

Just a couple I can remember that are "similar" to an R33 hiflow on an RB20..

Roy - TD05 20G-8cm.

makes over 1 bar boost by 4500rpm.

CEF11E - Slide hiflow (similar to GCG but non BB)

19 psi, 4200rpm

makes 240rwkw

[SimonR32]

sorry, i should have said full boost (20psi) 5000rpm

[Roy]

Someone, sooner or later is going to have to pull their fingers our and grab a new HKS GT-SS for their RB20DET, i have rad they are listed as for sale in T3 flange, but i have not actually seen one for sale on yahoo or perfectrun.

Surely he best option for what you are needing. Provide good power through basically std sized wheels, just with more modern aerodynamics and steel wheels permitting a bit more boost up the thing.

[salad]

gcg high flow looking at 5000rpm before you 5000rpm... laggy buggers

I had one on my RB20 which was bloody tired (popped a few weeks later, not turbo related) and it still made decent power and was quite responsive. I think the thing should've made more power if the engine wasn't on it's last legs too. But still, 220rwkw on 1.4bar, not too shabby.

I'd love to see your dyno sheet of it being a pig, because mine completely disagrees with that.

Just the usual mods, nothing special, just turned the boost up lots

Note: That's an RB25 turbo, not "standard" as the sheet indicates.

Boost starts ramping up 400rpm later and ramps up at the same rate. It started making more power than the stock RB25 turbo at 3600rpm and made full boost of 1.4bar (20psi) a smidge after that. 1bar came at around 3300-3400rpm.

Edited July 7, 2008 by salad

[NWR31]

heres my boost curve.

stock r32 rb20 with stock rb25 turbo.

full boost 14psi at about 3800 revs

ive just bought a apexi ax53B70-p25 to replace this one

Edited July 7, 2008 by norwest_rumbler

[Beer Baron]

Trust T518Z could be worth a look. I have one on my SR20 silvia and I love it. great little turbo. not sure how it would go on the RB20 but it can't be too bad.

[Roy]

I woudl strongly suggest that when looking at turbo setups on RB20s forget where they make boost. Look at the torque curves and look at road speed not rpm as the indicator of when its making power. Forget boost and forget rpm.

Even when they are makign boost way earlier they are nto really making any more power then other setups that walk away over 4,400rpm

[Beer Baron]

yeah I can back that up. like your car troy, makes boost faily early but feels very breathless down low. the SR on the other hand has similar spool up but feels much meetier down low. so you are right, it's not worth getting too hung up on where it makes boost, look at where it makes power and torque.

it should be said though, once up and running your 20 with the TD absolutely spanks the SR with the T518Z.

[NWR31]

I woudl strongly suggest that when looking at turbo setups on RB20s forget where they make boost. Look at the torque curves and look at road speed not rpm as the indicator of when its making power. Forget boost and forget rpm.

yes that is valid, except looking at torque curves vs rpm is just as good a comparison as road speed imo.

[NWR31]

yeah I can back that up. like your car troy, makes boost faily early but feels very breathless down low. the SR on the other hand has similar spool up but feels much meetier down low.

i would have thought there's not much point comparing a sr to rb20, the longer stroke will allways give much better low end grunt for the same boost i would have thought

Edited July 7, 2008 by norwest_rumbler