Rb20 Torque Monster :)

[SimonR32]

Finished tuning the little old RB20 last night using 50% CSR E85 and 50% BP98 mix (to make a E42.5) and was very surprised by the torque... Power was just under what I was hoping for but still very plenty for chirping 3rd.

Car mods as follows

K&N Filter

Z32 Afm

China cooler and piping

Deatschwerks 750cc injectors

Motor dead stock

Hypergear ATR43G3 0.63 internal gate on standard manifold

Full 3" exhaust

Walbro 255L/hr pump

Running 22psi on the E42.5

399.5hp or 298kw and 523.1Nm

BP98 curve vs E42.5 curve

Edited September 9, 2010 by SimonR32

[TiTAN]

no one is saying an RB20 wont make the power, but they make it ~1000rpm later than an RB25 and ~2000rpm later than an RB30 given the same setup.

[Lithium]

Very nice And fairly consistent with one I tuned late last year, "unknown" T3/T4 on stock manifolds and a GTSLink running GTR Injectors and a Walbro fuel pump on 20psi, using E33 fuel.

Do you have a boost curve? Looks like a real interesting shape "curve".

[SimonR32]

Do you have a boost curve? Looks like a real interesting shape "curve".

I can get one pretty easily... It ramps hard hits about 24psi then drops back off to a dead flat 22psi till redline!

Hits a brick wall at that power, thus the flat top end of the curve

[Lithium]

Ah yep, thought that might be the case (hitting 24 and dropping back) - was going to ask, as the one we did sortof hit around 17psi and crept up to 20psi... hence having a bit more of a peaky looking curve. We were working with a 2.5bar MAP sensor so 20psi was about the highest we felt safe going to, still makes for a hell of a quick car though

[SimonR32]

still makes for a hell of a quick car though

Heaps faster now... Drops 3rd gear from a standing start and bushfires streets haha

[STATUS]

Its got the correction setup to flywheel..... its all flywheel measurements.... not wheel measurements

ooh and the correction is set to SAE which is an older measurement (gives about 5-8% inflation) switch it across to SAE 2004 (latest rating)

[Lithium]

Will only actually be flywheel if they have something in the TCF field, the result I posted was axle power and I'd imagine if we had a 40%+ blend and were running 22psi we'd be at least as high as he was making. We had absolutely no hint of running out of flow and had a bit less lag, which is interesting as we were running a fairly quick run rate too.

[paulR32gtr]

Got any pics of your car? One in your avatar looks sweet

[SimonR32]

Its got the correction setup to flywheel..... its all flywheel measurements.... not wheel measurements

ooh and the correction is set to SAE which is an older measurement (gives about 5-8% inflation) switch it across to SAE 2004 (latest rating)

Without any correction it was 393hp so more like 1.5%

[SimonR32]

Got any pics of your car? One in your avatar looks sweet

[paulR32gtr]

And what colour code might that be?

Sorry to just blatently ignore the topic... your 20 is running sweet!

[SimonR32]

And what colour code might that be?

Sorry to just blatently ignore the topic... your 20 is running sweet!

Paint code: customgreen2010specbybbk

[STATUS]

sweet ride thats for sure.

[paulR32gtr]

Paint code: customgreen2010specbybbk

Hehe nice - sorry just trying to work out what to paint mine - me likey - you've pretty much nailed the dark green I had in my head.

What sort of max duty are the 750 injectors running at with the ethanol blend?

[hypergear]

Very good result Simon. Excellent power for RB20dets.

For comparison this is the same turbo in .82 rear on my RB25det internally gated on 98 fuel at 18psi. Very impressive for RB20det.

[Equinox]

Wow that's laggy for an RB25 making 300rwkw. :\ An RB25 making 300rwkw should have way more than 2500rpm of usable torque!

[hypergear]

Wow that's laggy for an RB25 making 300rwkw. :\ An RB25 making 300rwkw should have way more than 2500rpm of usable torque!

Its not the most responsive turbo. Well compare to a GT3076 .82 with same boost. I think its not too bad. Unless if you run E85 and cam gears. There is nothing installed on it that can advance the turbo's response or power output.

[R31Nismoid]

Sigh... Thats not really a useful comparison. You can clearly see the GT3076 setup has notable issues.

Is there any surge on it Simon? Looks like its building and then just tapers a tad early on the climb up.

Something my 600hp GT30 did, it wasn't really audible eithe which didnt help to workout

[SimonR32]

Is there any surge on it Simon? Looks like its building and then just tapers a tad early on the climb up.

Something my 600hp GT30 did, it wasn't really audible eithe which didnt help to workout

Are you talking about between 5000-5250?!?