Jump to content
SAU Community

Recommended Posts

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
  • Like 1
Link to comment
https://www.sau.com.au/forums/topic/336145-rb20-torque-monster/
Share on other sites

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".

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

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

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)

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.

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%

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?

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

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

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?!?

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Even more fun, leave all the ADAS stuff plugged in, but in different locations, hopefully avoid any codes!   And honestly, all these new cars with their weird electronics. Pull all the electronics out Duncan, and just shove an aftermarket ECU and if needed a trans controller in, along with a PDM. Make it run basic but race car styled!
    • To follow up a question from earlier too since I had the front bar off again (fking!) This is what is between the bumper and the drivers side wheel And this is the navigator side, only one thing but its a biggy! So basically....no putting coolers in the wheel arches without a lot of moving other stuff. Assuming I move to properly race prepping this car I'll take that job on and see how the computers respond to removing a whole bunch of ADAS modules
    • So I prepped the car for another track day on Wednesday (will be interesting to see coolant temps post flushing out and the larger reservoir, with a forecast of 3-14 being 20o cooler than last time I took it out). Couple of things to mention; since I am just driving the car and not taking a support vehicle, I took the rear seats out and just loaded the back up Team Trackday style. Look at all that space! To cover off removing the rear seat....it is weird (note the hybrid is probably different because it wouldn't have folding rear seats) Basically, you remove the lower seat base, very similar to a r series but it is a clip that pulls forward to release the base rather than it being bolted down. Easy Then, you need to remove the side section of the rear seat on each side. There is a 14mm head nut at the bottom of the side piece, the it slides upwards off a hook at the top to release; you also need to unhook the seatbelt from the loop at the top. Then the centre piece is weird. You need to release/fold the seats forward with the tab in the boot on each side From there, there are 2,x12mm headed bolts holding the rear of each seat to the folding bracket, under the trim between the rear seat and the boot (4x christmas tree clips there, they suck). The seat is out but you can see where the bolts attach to the bracket
    • As discussed in the previous post, the bushes in the 110 needed replacing. I took this opportunity to replace the castor bushes, the front lower control arm, lower the car and get the alignment dialled in with new tyres. I took it down to Alignment Motorsports on the GC to get this work done and also get more out of the Shockworks as I felt like I wasn't getting the full use out of them.  To cut a very long story short, it ended up being the case the passenger side castor arm wouldn't accept the brand new bush as the sleeve had worn badly enough to the point you could push the new bush in by hand and completely through. Trying a pair of TRD bushes didn't fix the issue either (I had originally gone with Hardrace bushes). We needed to urgently source another castor arm, and thankfully this was sourced and the guys at the shop worked on my car until 7pm on a Saturday to get everything done. The car rides a lot nicer now with the suspension dialled in properly. Lowered the car a little as well to suit the lower profile front tyres, and just bring the car down generally. Eternally thankful for the guys down at the shop to get the car sorted, we both pulled big favours from our contacts to get it done on the Saturday.  Also plugged in the new Stedi foglights into the S15, and even from a quick test in the garage I'm keen to see how they look out on the road. I had some concerns about the length of the LED body and whether it'd fit in the foglight housing but it's fine.  I've got a small window coming up next month where I'll likely get a little paint work done on the 110 to remove the rear wing, add a boot wing and roof wing, get the side skirt fixed up and colour match the little panel on the tail lights so that I can install some badges that I've kept in storage. I'm also tempted to put in a new pair of headlights on the 110.  Until then, here's some more pictures from Easter this year. 
    • I would put a fuel pressure gauge between the filter and the fuel rail, see if it's maintaining good fuel pressure at idle going up to the point when it stalls. Do you see any strange behavior in commanded fuel leading up to the point when it stalls? You might have to start going through the service manual and doing a long list of sensor tests if it's not the fuel system for whatever reason.
×
×
  • Create New...