RB25/30 in R32

[Cubes]

One has to wonder if the turbo you are running is better suited to the rb20 than the HKS2530.

It would be very interesting to see back to back dyno runs.

Well this is a little off topic.. so... this turbo on the rb30 with the larger exhaust a/r might be quite a good responsive thing.

[geordie]

Ok, so i know the rb25 (r32) head uses same injectors as R32 gtst, someeon mentioned changing over to GTR items later on, the R32 gtst are high impedence and the gtr low impedence, does this make a difference/complication......will aftermarket computers handle this?? Whats the go with injector impedence. Coz the above mentioned injectors are both top feed...that much i know.......

Cheers

Geordie

[Cubes]

Do a quick search, you'll have all the answers you need.

[mr_rbman]

mr_rbman,

 

For engine mounts head down the Shaun at Boostworx.

 

I bought my R32 RB25 head 2yrs ago from Adelaide jap for $750.

 

Take what Adelaide Jap say with a pinch of salt as they really don't know what parts are from what car.

They claimed my RB25 head was a R33 RB25 as the R32's didn't have a RB25 lol.

This was 2yrs ago so they may be a little more informed these days.

engine mounts i will do myself as i am a boilermaker and things like that r a piece of piss, i hope to do most things myself minus the wiring up (no idea with electrical things) and the tuning which i will be seeing Shaun at Boostworx for!

Never deal with Adelaide Jap, have had the same experiences as u with them and will never go to them again!

[geordie]

Do a quick search, you'll have all the answers you need.

Yeah i know i ws just drunk and feeling lazy when i posted that......hehhee

[sky30]

Tunned my car a bit more yesterday, my RB30det made 290 RWKW on 19.5psi, still using the stock RB25 n/a cams, and stock VL bottom end. Cant wait to get some decent cams in it.

[Cubes]

What cam specs are you looking at sky30?

[Sydneykid]

Its a lot of money to get so little power, i mean POWAH. But if i could be farked i have priced an RB30DET for about $6,500, thats with cams, pistons and rods. $7,000 with a bit of porting

Then i would need to get my TD06 rebuilt and hi-flowed using either a 25G compressor or a GT30 wheel (and back to 10cm exhaust housing) About $1400..RB25 gearbox and twin plate clutch with modded tailshaft. $3100

So to go from 235rwkws to 335-350rwkws it will cost another $11,000

This is not an unusual question faced by R32GTST owners, thinking about RB30/25 in their car. So it is releveant to this thread.

Have you worked out how much you could sell the RB20DET for, complete with turbo, clutch, gearbox etc? Basically everything that you don't need. Keep the PFC, intercooler, exhaust, AVCR etc. Basically everything that complements the RB31.

Secondly, 350 rwkw's is a bit low for a $7K RB31, more like 400 rwkw. And at Philip Island you can use it, you were there and saw the blue car utilise that amount of power to win a National Championship.

It is horses for courses:cheers:

[Sydneykid]

Tunned my car a bit more yesterday, my RB30det made 290 RWKW on 19.5psi, still using the stock RB25 n/a cams, and stock VL bottom end. Cant wait to get some decent cams in it.

That's getting up there in both power and boost. What's the A/F ratios look like?

[sky30]

Joel-cams im getting are tomei 260 degrees 8.8mm lift for both inlet and exhaust, which makes a fair improvement over the stock items.

SK- I set the A/F ratios to run at flat 12:1 at full load, using bosch o44 and rx7 injectors. Its a fair bit of power for a stock motor to handle, be interesting to see how long it lasts. Ive kept the rev limit fairly low at 7000rpm.

[Cubes]

Sky30,

You wouldn't happen to have a scanned dyno run you could throw up?

Does power flatten out up top with the stock cams?

[Sydneykid]

SK- I set the A/F ratios to run at flat 12:1 at full load, using bosch o44 and rx7 injectors. Its a fair bit of power for a stock motor to handle, be interesting to see how long it lasts. Ive kept the rev limit fairly low at 7000rpm.

Sounds OK, just don't be tempted into running a "just bit more boost" or "if I lean it out a little bit I can get to 300 rwkw". Resist the temptation.

You will find the cams make a heap of difference. I will be interested to see how much the boost drops with the increased efficiency.

[Bl4cK32]

Nice power there Sky30...what head are the cams made for? I was told they dont make rb25de cams....nice specs too Along the same lines Joel was thinking...

So these cams should help with the hydraulic pump u seen with the last setup then?

[sky30]

SK- If i was to run more boost with the correct a/f ratios and ignition timiing , do you think the motor would handle it??

Joel- On the dyno it makes peak power at around 6000rpm, and starts to drop off, but on the road its hard to notice this, and it seems to pull hard all the way to 7000rpm. not too sure why.

Darren- The tomei cams are RB20det cams, they also fit the rb25de.

[Cubes]

valve float/bounce = pump up.

Sounds good Sky30, peak at 6000rpm is a nice rpm point.

I'm sure you have seen this dyno graph of a GT30r.

The 3ltr definitely looks like it needs that better flowing exhaust housing to get its higher rpm VE up there to prevent power flattening out.

[Cubes]

sky30, are you running the gtr springs? Still running them with the new cams?

So so many questions.

[sky30]

yeah, still using GTR springs, plan to use them with the new cams.

[mr_rbman]

those figures look quite impressive so far, wheelspin would be huge, how much if u don't mind me asking do you think u have spent to date?

[sky30]

My motor/head, turbo ,Microtech ECU, and Fuel system has cost around $5500, I must say that all that money has been spent purely on parts, ive done all work and tuning myself, so it would cost alot more than that to pay someone else...

[Cubes]

Do you bother with an EGT guage to keep an eye on things?