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Rb20 Torque Monster :)

SimonR32

By SimonR32,
in Engines & Forced Induction

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SimonR32 Grand Master

SimonR32

Posted
Posted (edited)

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

08092010129.jpg

BP98 curve vs E42.5 curve

SAM_0019.jpg

Edited by SimonR32
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SimonR32
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 pl

SimonR32
SimonR32

Good to hear you are back on board the power boat roy

Lithium Grand Master

Lithium

Posted
Posted

Very nice :D 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.

RB20_E33.jpg

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

SimonR32 Grand Master

SimonR32

Posted
  • Author
Posted
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 Grand Master

Lithium

Posted
Posted

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 :D

STATUS Grand Master

STATUS

Posted
Posted

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 Grand Master

Lithium

Posted
Posted

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.

SimonR32 Grand Master

SimonR32

Posted
  • Author
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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%

paulR32gtr Mentor

paulR32gtr

Posted
Posted
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 Grand Master

hypergear

Posted
Posted
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.

post-a303078-atr43vsgt3076.JPG

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

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 Grand Master

SimonR32

Posted
  • Author
Posted
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?!?

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