Jump to content
SAU Community

Recommended Posts

I have 0.63 GT35R (ext gated) and it is on boost by 3200rpm.... no idea on full boost yet as the wastegate was leaking before I took the car off the rd to replace the ecu with something better. Stock internals, but every piece of supporting bolt ons in place with the exception of my poncams..... forged internals on standby :worship:

R33 S1 - RB25DET

  • 3 weeks later...
  • Replies 44
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

I have 0.63 GT35R (ext gated) and it is on boost by 3200rpm.... no idea on full boost yet as the wastegate was leaking before I took the car off the rd to replace the ecu with something better. Stock internals, but every piece of supporting bolt ons in place with the exception of my poncams..... forged internals on standby :D

R33 S1 - RB25DET

Do someone of you guys have a GT35R with 0.63 housing and can tell when the full boost will be available on an RB25?

As i read out the 0.82 housing have full bost at 4500rpm with some poncams on an RB25.

Thanks in advance.

Edited by Behind Horizon
I have had the .63 housing on my neo rb25det and it made over 340rwkw and rpm was at 9000 full boost by 3200 thats was at 1.7bar ..now thats pretty responsive for a high mount

it sounded like a machine!!!!...hahaha

cheers

Are you sure that your GT35R can deliver power up to 9000rpm with a 0.63 housing ? :laughing-smiley-014:

I have had the .63 housing on my neo rb25det and it made over 340rwkw and rpm was at 9000 full boost by 3200 thats was at 1.7bar ..now thats pretty responsive for a high mount

it sounded like a machine!!!!...hahaha

cheers

Can you please post up a dyno graph?

More importantly of where 'full boost' is made, is where it makes all its boost when rolling on the throttle in second gear and or how it develops boost in first gear.

A good example of this is the difference between the GT30 .8, GT35 .8 and GT35 1.06 on the dohc 3ltr.

The 'full boost' difference between them on the dyno is marginal but on the road there is a HUGE difference as to how they drive. The GT30 feels like a supercharger with strong linear power from idle where as the GT35 (in the lower gears I'm talking) feels a little laggy laggy then bang your off.

Interestingly they both made the same power on basically the same boost.

For comparisons sake the GT35r .6 turbine map flows very close but slightly better to that of the GT30r .8 combination.

The GT35 1.06 that I've seen makes all its boost around 3900rpm so marginally higher than the GT35 .82 yet on the road the difference in spool is unbelievable. Its as if the smaller housing starts making some boost and providing the windmill affect at a considerably lower rpm where as the 1.06 comes on in a rush within a few hundred rpm.

I'd really like to see the comparison in spool and drive ability between the GT3040r .82 and the GT35r .6. My guess is they would be 'fairly' close.

So in short; a dyno sheet making x psi at 4500rpm doesn't tell the whole story of how it performs on the road when taking off from a stand still then rolling on the throttle or accelerating out of that low speed second gear corner.

Are the GT3040r and GT30r different? I Always assumed one has a different front housing..

This thread is interesting as I will be putting my GT3040r on in the future and like to see back to back results with similar turbos.

Cheers

Yeah there's a few different variants of the GT30 with the 60mm turbine wheel.

GT3071

GT3076 (old school .7 comp 7blade compressor)

GT3076 (HKS3037S style .6 comp cover 6 blade compressor)

GT3040 (gt35r 82mm compwheel .7 comp cover)

so what would you recommend, gt35r .63, .86 or gt3040 .86, i'd really want a hks 3037 kit but they are too expensive, the car isn't used for drifting or anything, its just a daily street car and sometimes used at the drags which is why i thought the .86 gt35r would be a good option as it wouldn't run out of puff up top as i thought the .63 would, but if the .086 doesn't come on full boost until over 4500 it wouldn't be efficient as i can only rev to 7000 because its still a stock bottom end, say for example rolling in 2nd gear with a gt35r 0.86 at about 3000rpm, how long would it take to get up and go if i put my foot down, would it feel like a gutless NA car below 4500?

1.7bar = 25psi.

So whats the secret infected flow? How did you get it making 25psi at 3200rpm when every one else isn't able to get even a GT30 making that boost at 3200rpm.

So given 25psi at 3200rpm.. That would have to be 18psi by 2900rpm??? Sounds technically impossible from the 2.5ltr unless its ramp rate was mega slow ... as I said on the brake.

Not having a dig. Just trying to work out how you managed to beat the laws of physics. So tell us how you managed it. :)

I like lots of brutal quick spool and mid range that makes the driver work so I'm not the one to comment. :)

On pump fuel with std cams the .6 appears to make around 270rwkwish. Do cams you can pick up 30rwkw ish push more boost in to it and you should be able to crack 300rwkw.

Sure some are able to keep raming boost in on pump fuel which does make more power but its not good for longevity especially if you want it to hang together at the local track.

So in saying run out of puff up top.. Really no such thing it just doesn't make as much power as easy.

The .82 no doubts help with getting it to hook up and allows power to be made easier but to really make use of it a set of cams and extended rev limit would be nice. But realistically as long as it makes all its boost at 4k 3-3.5 thousand rpm band is ok.

The rb20t blokes work with less. :)

the 0.82 makes around 300rwkw on around 1 bar doesn't it, u saying the 0.63 would make 270rwkw with same boost, i got around 240rwkw now and getting kinda bored of it so i think i'll be going with the 0.86, dou you think it would be better low mounted or high mounted

Depends on the dyno and the car.

I haven't known one to make 300rwkw on 1bar BUT I was told I will get close with a set of reasonable cams (265's).

IF you run a nice exhaust manifold, nice inlet, free exhaust with big cams u can make 300rwkw on around that boost. But its not as simple as just dropping a .82 on and it will make that power on 1bar.

A good example is sky30. Std inlet, std exhaust manifold gt35 managed 312rwkw on 18psi roughly. tried cams didn't help with peak power due to what I suspect is the end of the run for the std exhaust manifold.

Did big cams in an rb26 head with its std short runner plenum and a nice exhaust manifold. Power jumped to 382rwkw on ~17-18psi.

Making the motor breathe better via nice cams, inlet and exhaust manifold modifications is a must if you want to run big numbers on low boost.

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



  • 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...