RB20DET vs SR20DET

[TTT]

you talking about the top of the mountain episode?

that was a scary moment hey.. Although I thought that was the FJ powered car..

Might have to go have another look..

[Roy]

It was a DR30, but the R31 with its RB20 did finish 2nd and 3rd at Bathurst:)

[predator]

There are few rb22 and rb24 over in japan that I have seen which have low 10's figures.. Anything is possible, if you throw enough money at it..

How many km are SR20's good for in general anyhow? (just asking)

[32vspecII]

200000km

my old 180sx had atleast 170000km when I sold it and no problems . Most people seem to be rebuilding around 150-200000km .

[discopotato03]

LOL it was a DR30 and in car film . Its on the video "The Great race , the Turbolent years Bathurst 1986 - 1992" . Great driving for basically an overgrown Datsun 1600 with a top endy FJ20ET .

It was interesting to watch the R31's race , they appeared to be driven on the rev limit everywhere .

[jnr32r]

where do you get that video from???

only ever saw a doco on sbs a while bak... the rest just all stories from afficionados ...

[s13viper]

show me graphs of an rb20 and an sr20 with the same turbo, this will be a good comparison... not based on whether 6 cylinders is better then 4, but rather a direct engine to engine comparison

i think i can answer this one

2 180sx's....one has a 1992 SR20DET redtop with a HKS2530 @ 1.2bar, 600x300x80mm FMIC, 3" exhuast, apexi intake, power FC, HKS 550cc injectors, walbro 550HP pump, OS giken twinplate Clutch - on a very convservitive dyno (at a dyno day) it made 191.8rwkw. stock cams/internals

the other 180sx, has a 1992 RB20DET, with a HKS2530 @1.1bar(same turbo), 600x300x80mm FMIC (same IC), 3" exhuast (same), K&N intake, GTR fuel pump, stock injectors but a FPR (fuel pressure regulator) and a SAFC tuned with the stock computer. it made (at the same dyno day, a few mins after the other 180sx) 192.0rwkw. stock cams/internals

virtually identical power - the torque curves were interesting.....the SR20 was higher untill 4000rpm where the RB took over.....so the SR has the lower end...but it fell away from 6000rpm...where the RB stayed strong to 8000rpm. i worked out the "approx" area under the graphs....the RB had it by about 10% more...due to the wider power band.

now...when racing....from a standing start....the SR wins untill mid-end of 2nd gear, where the RB pulls on it....then by the time 4th comes...its pulled 1.5-2 lengths - its a similar situation when racing supra's...RB takes over in 2nd and continues to pull away...on a rolling start its RB all the way...from 110kph in 3rd gear (4500rpm in the RB , PERFECT from launching from) it nails the SR

the top end of the RB helps here......

i guess u should come to ur own conclusions about these "results"

[Roy]

...where the RB stayed strong to 8000rpm. i worked out the "approx" area under the graphs....the RB had it by about 10% more...due to the wider power band....

Imagine if it had a fuel & ignition modified for the 2530:)

[s13viper]

also id like to add

the 2 cars are VERY similar in handling!!!

the RB seems to have made little to no difference

Roy : the RB20 180sx is going into the shop on monday , injectors, wolf 3d management, tune @ 1.3bar

[discopotato03]

The Pitstop Bookshop - www.pitstop.net.au in Perth . Very very good mail order service , huge range . Also bagged a copy of Bathurst 1992 highlights , a must for any R32/GTR fan .

[discopotato03]

Have any of the S13's been much of a success in road racing anywhere ?

[yogi000]

i'll have some results for this thread next week.

rb20det stock internals

HKS gt2530

cam gears

gtr pump

3 inch -> 3 1/2 inch exhaust

ARC fmic

nismo fpr

gtr 444cc injectors....about to be installed

splitfire coil packs

power fc .....about to be installed

Blitz ebc (running .9bar)

hoping for some good response and about 190rwkw

hopefully next week to be taken to jim at CRD to put the finishing touches on it. I'll keep you guys posted on how it goes.

[mokompri]

mmm 190rwkw for 1.2 bar on a gt2530 is very low...

whats the average power of each ? when did each make peak power ?

[carl h]

also id like to add

the 2 cars are VERY similar in handling!!!

the RB seems to have made little to no difference

Roy : the RB20 180sx is going into the shop on monday , injectors, wolf 3d management, tune @ 1.3bar

glad to here that some one else realizes that they handle just fine with the rb20 up front.

over here stateside there is a stigma about the rb series being "massively" heavier thus making your handling crap.

i had no problems with my car, and it was tons of fun to drive, especialy sideways.

[discopotato03]

I guess any car can oversteer if the suspension is set up for it . I'm told the R32's front suspension can do things that S13/14/15's can't , but thats about making rapid forward progress - and pointing in the right direction .

[FATGTS-R]

My R31 GTSR was returned to me on Monday.

Mods are: GTR injectors, walbro pump, custom fuel rail and all new lines. Exhaust, pod and ecu.

The rest is standard, remembering GTSR had a TO3/4E from factory.

I also removed all the butterflies and the spindle from the sandwich plate between head and inlet manifold.

Results were 225rwkw @ 13psi and 170rwkw @ 6-7psi.

[Roy]

mmm 190rwkw for 1.2 bar on a gt2530 is very low...

Its dyno figure, dont try and make sense of it, the important thing is the cars were on THE SAME dyno so the readings for once can be compared:)

[s13viper]

correct - dyno runs are only good for comparison if 2 cars are run beside each other

the 2 cars that i compared have both made over 220rwkw on different dynos

i just used the 190rwkw runs as example as thats what they both made a few mins apart on a the same dyno.

[Roy]

correct - dyno runs are only good for comparison if 2 cars are run beside each other

the 2 cars that i compared have both made over 220rwkw on different dynos

i just used the 190rwkw runs as example as thats what they both made a few mins apart on a the same dyno.

Regarding the 220 on another dyno...exactly. There is another thread at the moment stating a certain power level...and from the experiences of a friend his car made 20rwkws more then what his car typically makes...so comparing power figures from different dynos is a waste of time.

A lot of ppl claim massive wheelspin probs at 200rwkws in an R32 GTST, so with 222rwkws and no wheelspin at all in 2nd let alone 3rd, i question my power figure:(

[carl h]

A lot of ppl claim massive wheelspin probs at 200rwkws in an R32 GTST, so with 222rwkws and no wheelspin at all in 2nd let alone 3rd, i question my power figure:(

perhaps your vlsd hasnt given up the ghost yet.