Qs for RB20 Owners

[yogi000]

scotty, now thats pretty good value for money....whats happened to the fuel system??? is it coping?

[Interloper]

My Budget RB20DET-

 

Imported with HKS Super Dragger exhaust and K&N Big Mother air pod

Added TurboSmart boost controller - $250, dynoed @ 150rwkw

Added Dump Pipe - $300

Added Cold Air Induction - Free

Added RB25 Turbo - $350

Added Front-Mount - $500 (inc pipes, see http://www.skylinesaustralia.com/forums/sh...ead.php?t=47918)

Added additional Cold Air Induction - $50

 

Next I want to remap the ECU and then it's time to Dyno it again. Hopeing to be around 200rwkw for around $1K. Then that's it with RB20DET, move on before blowing the budget.

I don't think you can achieve a real 200rwkw with the small stock injectors, from the dyno i have experience with, the stock injectors will max out 180rwkw and by then the mixtures will be fairly lean at that.

[Roy]

A few ppl have said the RB25 turbo can make 200rwkws. It will eb nteresting to see the result...i dont think the turbo will get you there, if it does then its a great upgrade.

[oscar32]

The hi flow would though wouldn't it?

Is the RB25 turbo a straight bolt up, or does it need some mods?

[nedb]

My Rb20 with RB25 turbo, pod and 3" turbo back exhaust did only 130 rwkw with stock boost and everything else and 11.3 A/F ratio.

[ScottKing GTS-4]

My Rb20 with RB25 turbo, pod and 3" turbo back exhaust did only 130 rwkw with stock boost and everything else and 11.3 A/F ratio.

My RB20 did 150rwkw with 3" cat back exhaust, pod and turbo smart boost controller on the UAS dyno. What Dyno where you running it on? I've now got a FMIC, 3" dump pipe, CAI and an RB25 turbo, hasnt been dyno'ed with the latest mods yet however.

[ScottKing GTS-4]

My Rb20 with RB25 turbo, pod and 3" turbo back exhaust did only 130 rwkw with stock boost and everything else and 11.3 A/F ratio.

Ahhh just saw the "stock boost" bit. Makes more sense now

[[SPESHAL]]

my 2c...which aint much

 

buy a rb30 bottom end from wreckers (mine cost $100 )

buy an rb25de head (mine cost $750)

do a std bottom end rebuild of the rb30 using same pistons, just hone, new rings and bearings ($850?)

 

bolt on head to block, drill tap tensioner, $30 timing belt, 2x rb30 tensioners ($80 ea)

 

how much so far?...using rb20 sump, manifolds, turbo (i am to start ) water pump, rb20 oil pump....no costs here.

 

redrill engine mounts to lower engine, plug in rb20 sensors, mod front pipe.

 

done...turn key and watch the rb30 rumble for under 2k.

 

But as they say...the spending never stops once it starts....i wish i had kept to the plan above and watch people grin

 

Seriously though i had the same drama as you. Rb20 blew, and went the rb31. Never look back now

The rebuild costs your mentioning, is that doing it yourself? Would there be the need for any boring or machining?

[nedb]

ScottKing GTS-4 - Yes that was stock boost on Unigroup's DD dyno. If everything goes OK the FMIC is going in this weekend and i'll have the 100% mods as you. :headspin:

[Ronin]

don't think you can achieve a real 200rwkw with the small stock injectors, from the dyno i have experience with, the stock injectors will max out 180rwkw and by then the mixtures will be fairly lean at that

Na stock injectors are good for 200-220rwkw. my 32 makes 190rwkw with stock injectors, pump, reg etc no worries.

[Sydneykid]

I didn't think you could put the rb20 head onto the rb30 bottom end? Is what your saying just a miss type? Or can it really be done?

Using my Rb20 head would be a lot more easy, then looking for an rb25 head if I went that way with a motor build up.

Shoot about 10 years ago using an RB20 cylinder head on RB30's was common. It is a prick of a job, welding, redrilling machining etc. But the result was better than a SOHC cylinder head. Wouldn't even think of doing it now with RB25 cylinder head's being so common and RB26 top ends being almost affordable.