Jump to content
SAU Community

Recommended Posts

hi, just thought id share my results after slowly building my series 1 r33 gts-t up over the past 4 years and having my car of the road for the last nine months.

had my engine rebuilt with gtr rods wiseco forged pistons , tomei poncams step 1 256 degreee duration with tomei valve springs e.t.c. running link ecu , 550 cc/min injectors 600hp bosche fuel pump. exedy clutch, standard plenum. gearbox e.t.c.

upgraded turbo from gcg gt3037 500hp turbo with a/r .63 exhaust housing running internal wastegate to a gt3040 600hp turbo a/r.82 exhaust housing on a high mount manifold , running 38mm tial external wastegate through 3 inch exhaust.

heres the results : power went from 281 rwkws at 22psi to 346 rwkws on 24psi on the new set up ! i couldnt believe it ! i was expecting around the 300 to 315rwkw mark, wow have to say im exstatic!

theres definately more lag than before but the power comes on really hard from 4500rpm now. i cant post up dyno sheet , because im still a computer no hoper but i have plotted the results for comparison for anyone who is interested:

gt3040 600hp turbo a/r .83 exhaust housing gt3037 500hp turbo with a/r .63 ex

3000 rpm 50rwkw at 2 psi 3000 rpm 91 rwkw at 7psi

3500 rpm 65 5psi 3500 rpm 110 rwkw 14psi

3800 rpm 76 6psi 3800 rpm 133 rwkw 20 psi

4000rpm 80 8psi 4000 rpm 161 rwkw 22 psi

4200rpm 112 11psi 4200 rpm 175 rwkw 22 psi

4400rpm 144 20psi 4400 rpm 231 rwkw 21.5 psi

4500rpm 168 24psi 4500 rpm 242 rwkw 21.5 psi

4600rpm 216 25.5 psi 4600 rpm 252 rwkw 21 psi

4700rpm 272 25.5 psi 4700 rpm 253 rwkw 21 psi

4800 rpm 274 24 psi 4800 rpm 259 rwkw 21 psi

4900 rpm 296 4900 rpm 262 rwkw

5000 rpm 296 5000 rpm 267 rwkw

5200 rpm 300rwkw 5200 rpm 273 rwkw

5400 rpm 312 5400 rpm 273 rwkw

5600 rpm 314 5600 rpm 272 rwkw

5800 rpm 332 5800 rpm 273 rwkw

6000 rpm 332 6000 rpm 281 rwkw

6300 rpm 334 6300 rpm 280 rwkw

6500 rpm 340 6500 rpm 272 rwkw

6700 rpm 346 6571 rpm 272 rwkws power dips right off

6900 rpm 344

7000 rpm 332 rwkw

7300 rpm power dips right off.

Edited by bigcarl
Link to comment
https://www.sau.com.au/forums/topic/148805-gt3040-600hp-turbo-upgrade-resolts/
Share on other sites

YESSSS my car is being built atm and is ready in two weeks and i have exactly the same parts as you, i was aiming for 300-330rwkw, even if i got like 280rwkw i was goin to be happy. But now thats great it gives me a good idea on power figures, well done lol.

Gotta be happy with that!

It also looks like you could have got heaps more out of the 3037 as well. There was 2000rpm band where there was no increase in power............leads me to believe that something was holding it back? Is this the same reason the 3040 is not showing any power increases in the top end?? Injectors maybe??

hi, just thought id share my results after slowly building my series 1 r33 gts-t up over the past 4 years and having my car of the road for the last nine months.

had my engine rebuilt with gtr rods wiseco forged pistons , tomei poncams step 1 256 degreee duration with tomei valve springs e.t.c. running link ecu , 550 cc/min injectors 600hp bosche fuel pump. exedy clutch, standard plenum. gearbox e.t.c.

upgraded turbo from gcg gt3037 500hp turbo with a/r .63 exhaust housing running internal wastegate to a gt3040 600hp turbo a/r.82 exhaust housing on a high mount manifold , running 38mm tial external wastegate through 3 inch exhaust.

heres the results : power went from 281 rwkws at 22psi to 346 rwkws on 24psi on the new set up ! i couldnt believe it ! i was expecting around the 300 to 315rwkw mark, wow have to say im exstatic!

theres definately more lag than before but the power comes on really hard from 4500rpm now. i cant post up dyno sheet , because im still a computer no hoper but i have plotted the results for comparison for anyone who is interested:

gt3040 600hp turbo a/r .83 exhaust housing gt3037 500hp turbo with a/r .63 ex

3000 rpm 50rwkw at 2 psi 3000 rpm 91 rwkw at 7psi

3500 rpm 65 5psi 3500 rpm 110 rwkw 14psi

3800 rpm 76 6psi 3800 rpm 133 rwkw 20 psi

4000rpm 80 8psi 4000 rpm 161 rwkw 22 psi

4200rpm 112 11psi 4200 rpm 175 rwkw 22 psi

4400rpm 144 20psi 4400 rpm 231 rwkw 21.5 psi

4500rpm 168 24psi 4500 rpm 242 rwkw 21.5 psi

4600rpm 216 25.5 psi 4600 rpm 252 rwkw 21 psi

4700rpm 272 25.5 psi 4700 rpm 253 rwkw 21 psi

4800 rpm 274 24 psi 4800 rpm 259 rwkw 21 psi

4900 rpm 296 4900 rpm 262 rwkw

5000 rpm 296 5000 rpm 267 rwkw

5200 rpm 300rwkw 5200 rpm 273 rwkw

5400 rpm 312 5400 rpm 273 rwkw

5600 rpm 314 5600 rpm 272 rwkw

5800 rpm 332 5800 rpm 273 rwkw

6000 rpm 332 6000 rpm 281 rwkw

6300 rpm 334 6300 rpm 280 rwkw

6500 rpm 340 6500 rpm 272 rwkw

6700 rpm 346 6571 rpm 272 rwkws power dips right off

6900 rpm 344

7000 rpm 332 rwkw

7300 rpm power dips right off.

sweet this gives me some good stuff to go by as im putting on a gt3040 with a .63 exhaust housing onto a rb25det powered silvia just got to build the turbo mainfold so the turbo sits in a nice spot

Nice results indeed but its my belief that the GT3037 underperforming because it needed to be;

- externally gated

- use a bigger 0.87 housing

- and run the boost that the GT3040 had.

It would have broken the 300rwkw barrier easily! But nevermind, I think you've done well either way! 340rwkw must be animal as.

thanks for all the positive replys guys, kaido my tuner thinks that the standard plenum isnt a bad thing in terms of flow but a larger throttle body and plenum he thinks would pull a bit more power.

b h dave ; low mount stainless manifold 6 into 4 into 2 design , nothing flash. a/r .63 internal wastegated exhaust housing same as whats on standard rb25 turbo. yes 7 blade to4s compressor

r31 nismoid; ive got tomei poncams step 1 , ported head and tomei valve springs. thats an interesting point, i wonder if my 3 inch exhaust is holding it back ! lol although im very happy with the power!!! im still trying to get used to it , the cars only got standard suspension and brakes! so thats definately where i will be spending the dollars next.

roy, i think that the gt3037 500hp power would have definately made 300 rwkws plus with an a/r .83 exhaust housing. gcg told me that it would have increased the lag by 500 to 700 rpm and because it was knackered , i went the gt3040 600 hp compressor instead. even though iam very happy with the gt3040 turbo i still would advise anyone who wants a good street combination still with alot of grunt to go the gt3037 500hp turbo combination.

my skyline is an absolute animal now! i can hardly wait to take her to calder park!

I only had a 3" aswell with mine... hmm... i think you are getting valve float or similar issues as DVS said.

Based on what i saw, there is no reason for the power not to hold out to 7500rpm at the least when mine with the stock cams held firm to 8000rpm.

v power racing 100 ron from shell or its old name was optimax extreme. although my tuner thinks thats mobil synergy 8000 98 ron is just as good go figure. valve float wow i hope not! maybe 25 psi over 7000 rpm even with the tomei valve springs and extra lift of the tomei cams???? have to look into this, thanx for the info nismoid.

Just throwing ideas out there dude as a number of GT30 setups (INASNT etc etc) didnt drop off sharply like you said.

Maybe cam timing isnt perfect?

Its something you might need to dig to find

When do 550 injectors max out? I would have thought that would be somewhere to begin looking?

550's be albe to support around 100hp each so around 600hp

My HKS 3037S with 0.73 ex housing is still climbing at 8000rpm- Tomei 256 8.5mm lift External gate. 21psi at 3700rpm

Edited by Simonster

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

    • Cheapest Jaycar one is only $65.
    • Probably best way would be using a proper dB / SPL meter lol Buy one and ship it from state to state to have a consistent test device lololol  
    • Not electric car good of course, it's still just a crappy old ICE
    • Yeah, but the good news is that can all be tuned out...the V37 has excellent throttle response now, and with the tiny factory turbos is pretty quick without lag
    • I did change bodyshops. The most recent place was very fast. I think the trick is to have smaller, simpler jobs. A front end repaint and some (extensive) sideskirt and fender stuff is a 'small cash' job for them. It was expensive but 'worth' it purely cause: 1) They did everything great 2) They did everything fast Get what you pay for maybe? Pictured: Very stock looking car from my very old phone. I did realise that oncoming traffic would probably be like "Oh look at this guy, commuting around in a GTR!" (until they see the side profile). This is the sad state of my fender liners and front fitment with my current stock GTR sized wheels (18x9 +30) This is how the rear sits with a 25mm spacer. I say 25mm because it's actually a 20mm spacer sitting on the studs which are ~30-31mm, and the wheels have a ~5mm cutout. So... this is very not safe to drive. This is the other side.. .with a 22mm spacer. Yes, the studs are ~27mm. Yes they're different both sides. I spent a fair amount of time measuring. This was the old pod setup behind the box in the past. Old vs New Pod she tells you not to worry about:   Turns out I measured this pod filter pretty damn accurately which I was chuffed about. I went for a ~3hr drive for 'testing' reasons up into Healseville hills. Believe it or not, the induction noise is the same between small and large pod. I guess it has more to do whether a pod is *present* or not, and the diameter of the pipe. It does sound very decent in cabin though (and extremely 'smooth') - Though behind the car the exhaust noise is nonexistent now. So uh, it's all for the driver. I'm confident it has to be quieter than @Dose Pipe Sutututu's car. I should test it. Is there a way to do it with an app or something we can both agree on? (we are both very old men now competing for quietest car) I've texted Trent at Chequered to book in to see some before/after. I can now twist the pod entirely out of the engine bay on the dyno to really rule in/out any intake restrictions. And/or remove the pipe entirely which I will probably do for testing reasons. The logs show *maybe* a difference in ambient KPA vs Intake KPA at wot. But I'm talking the difference to -3/4 before to maybe -2/3 now. The tune is not wildly out or even changed at all. The only takeaway I have is the car is on 17% ethanol as it's still got the fuel from the dyno in it. It's plausible that that tune would have resulted in the car erring on the side of being too rich (it was) and right now it seems to be bang on perfect or within -0.5% either side of target. I was tempted to take it to a Drag day to see what MPH it would trap (and tune the car) but then I wouldn't have a number and a pretty line. I may do that after I re-hit the dyno, purely to go to LS1tech and shout about how their dynos are all very inaccurate while my low HP car traps the same MPH as cars with the same setup in the US, who make 375RWKW (supposedly). It was safe to say Mr Mamo was not really happy with me posting the results yet. So I owe it to at least try the intake thing for my own sake and not besmirch people who want to buy a similar USA heads and cam setup and get disgusted that they make lower HP than simple bolt-ons which can be up to the "330rwkw+" kw region over there - Which here equates to about 270kw. (and runs the same 115-118mph)
×
×
  • Create New...