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Discopotato On An Rb20

Josh

By Josh,
in Engines & Forced Induction

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Josh Grand Master

Josh

Posted
Posted (edited)

I just did a quick search, but didn't see anything relevant - How do you guys reckon a Discopotato(GT2860R i think) would go on an RB20? too laggy?

Just considering some new turbo options for the 20 and a few mates suggested this..

EDIT* This is for a heavily drift orientated setup by the way..

Edited by Josh
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Josh Grand Master

Josh

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on SR's the disco is not too laggy, doesn't have huge top end power, but is pretty grunty down lower...

what would make it work differently on an RB20? Im no expert but would it have something to do with the different exhaust pulses(and volume of gas in each pulse) of the SR and RB's?(Considering they are the same displacement, just 2 more cylinders..)

silver gts-t Grand Master

silver gts-t

Posted
Posted

shouldnt be to laggy at all..

on a rb20 you would get about 220rwkw with it

but with it you will also need a new dump pipe, water and oil lines, and t28- t3 adapter flange + labour

in the end better off getting a GCG highflow for the same power and less hassel straight bolt on

Josh Grand Master

Josh

Posted
  • Author
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Mmm, not gunna worry about a highflow.. I do realise I will need the flange adapter, oil + water lines, but just considering something different..

However talking to a fella I know, he reckons it should go alright, but will be fairly laggy. Won't go as well as it does on an SR due to RB not having the dynamic torque that the SR's have..

discopotato03 Grand Master

discopotato03

Posted
Posted

The Discopotato GT28RS AKA GT2860RS is really a slight compressor variation on the HKS GT2530 but its housings suit 4 pot 1800-2000cc better . It tends to like being used in .86AR (GT28) exhaust housing and the TO4B compressor cover is fitted because it can turn some big revs and pump a lot of air for a 60mm compressor . I do remember someone fitting it in this form to an RB20 and found it laggy - sort of the all in with a bang at 4000rpm . If you were lucky and had the HKS T3 flanged 2530 exhaust housing (.64AR) it would no doubt pull the bottom end up but then its not operating as its designer intended so no promises .

I don't have time to get into an SR20/RB20 debate but it is obvious that the RB20 was designed to rev where the SR20 was not . The whole 4 cyl/6cyl thing is going to revolve around individual cylinder capacity and breathing so they really are worlds apart . For convienence sake I reckon DP for SR20 and either Hi Flow or model specific 2530 for RB20 . Because I'm obstinate I would build (get built) a variation of the real GT3071R with the slightly smaller 52T compressor so that it would not have high boost anywhere but a broad power range to roam around in . It would have to hang off the HKS manifold and be externally gated so not cheap easy or convienent .

Cheers A .

MerlinTheHapyPig Mentor

MerlinTheHapyPig

Posted
Posted

discopotato (GT28RS) is less laggy than GT2871R

here are the specs for people who are intersted

GT28RS

HP 350

Compressor 60mm A/R .60 Trim 62

Turbine 53.85 AR .86 Trim 76

GT2871R

HP 400

Compressor 71mm A/R .60 Trim 56

Turbine 53.85mm AR .64 Trim 76

(2 versions of gt2871r one has .64 A/R on turbine, one has .86 A/R on turbine, all other specs are the same)

Josh Grand Master

Josh

Posted
  • Author
Posted

Another thing we were possibly thinking about was getting an RB25 rear housing machined to fit the disco.. that way its a straight bolt to manifold jobby not to mention retaining the same dump..

all in by 4000 doesn't seem too bad either..

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