Josh Posted April 18, 2006 Share Posted April 18, 2006 (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 April 18, 2006 by Josh Link to comment https://www.sau.com.au/forums/topic/114030-discopotato-on-an-rb20/ Share on other sites More sharing options...
CATKICKER Posted April 18, 2006 Share Posted April 18, 2006 I am looking into turbos myself and from what I have picked up it would be a bit too laggy! Big power top end though!! Link to comment https://www.sau.com.au/forums/topic/114030-discopotato-on-an-rb20/#findComment-2100110 Share on other sites More sharing options...
Josh Posted April 18, 2006 Author Share Posted April 18, 2006 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..) Link to comment https://www.sau.com.au/forums/topic/114030-discopotato-on-an-rb20/#findComment-2100133 Share on other sites More sharing options...
CATKICKER Posted April 18, 2006 Share Posted April 18, 2006 hmmm, I thought it was quite a big turbo... Might have to do a little more research before I give an opinion All the best with it Josh and wouldn't mind hearing how you go once you have replaced the turbo! Link to comment https://www.sau.com.au/forums/topic/114030-discopotato-on-an-rb20/#findComment-2100154 Share on other sites More sharing options...
silver gts-t Posted April 18, 2006 Share Posted April 18, 2006 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 Link to comment https://www.sau.com.au/forums/topic/114030-discopotato-on-an-rb20/#findComment-2100207 Share on other sites More sharing options...
Josh Posted April 19, 2006 Author Share Posted April 19, 2006 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.. Link to comment https://www.sau.com.au/forums/topic/114030-discopotato-on-an-rb20/#findComment-2103104 Share on other sites More sharing options...
StockyMcStock Posted April 19, 2006 Share Posted April 19, 2006 Won't go as well as it does on an SR due to RB not having the dynamic torque that the SR's have.. explain that one to me? Link to comment https://www.sau.com.au/forums/topic/114030-discopotato-on-an-rb20/#findComment-2103216 Share on other sites More sharing options...
Josh Posted April 19, 2006 Author Share Posted April 19, 2006 because of the stroke of the SR it has the torque already there before boost comes in.. helping a lot, the RB just doesnt have the stroke.. Link to comment https://www.sau.com.au/forums/topic/114030-discopotato-on-an-rb20/#findComment-2103232 Share on other sites More sharing options...
grim32 Posted April 19, 2006 Share Posted April 19, 2006 I really dont think it will be that laggy, but my idea and your idea of lag may be two different things. ps. i have a 3071 and thats not laggy to me. Link to comment https://www.sau.com.au/forums/topic/114030-discopotato-on-an-rb20/#findComment-2103259 Share on other sites More sharing options...
Josh Posted April 19, 2006 Author Share Posted April 19, 2006 true, plus boost is just a clutch kick away Link to comment https://www.sau.com.au/forums/topic/114030-discopotato-on-an-rb20/#findComment-2103269 Share on other sites More sharing options...
N I B Posted April 19, 2006 Share Posted April 19, 2006 I have some Dyno runs on an RB20 with a 2871RS(Disco's bigger Bro) Ill see if i can get hold of the rego number to recall them for you but it was quite good from memory. Link to comment https://www.sau.com.au/forums/topic/114030-discopotato-on-an-rb20/#findComment-2103300 Share on other sites More sharing options...
StockyMcStock Posted April 19, 2006 Share Posted April 19, 2006 because of the stroke of the SR it has the torque already there before boost comes in.. helping a lot, the RB just doesnt have the stroke.. i am of the opinion that the presence of two more cylinders will more than make up for it. Link to comment https://www.sau.com.au/forums/topic/114030-discopotato-on-an-rb20/#findComment-2103434 Share on other sites More sharing options...
Josh Posted April 19, 2006 Author Share Posted April 19, 2006 Maybe, I guess the only way I will find out for sure is to actually do it myself.. or if someone who has done can come forward.. Link to comment https://www.sau.com.au/forums/topic/114030-discopotato-on-an-rb20/#findComment-2103466 Share on other sites More sharing options...
discopotato03 Posted April 20, 2006 Share Posted April 20, 2006 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 . Link to comment https://www.sau.com.au/forums/topic/114030-discopotato-on-an-rb20/#findComment-2104254 Share on other sites More sharing options...
MerlinTheHapyPig Posted April 20, 2006 Share Posted April 20, 2006 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) Link to comment https://www.sau.com.au/forums/topic/114030-discopotato-on-an-rb20/#findComment-2104315 Share on other sites More sharing options...
Josh Posted April 20, 2006 Author Share Posted April 20, 2006 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.. Link to comment https://www.sau.com.au/forums/topic/114030-discopotato-on-an-rb20/#findComment-2105818 Share on other sites More sharing options...
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