Gt3040 600hp Turbo Upgrade Resolts

[bigcarl]

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 December 26, 2006 by bigcarl

[Kaido]

Nice numbers! Is the 3040 pretty much maxed out at 24psi, or do you think you can squeeze a bit more out? Also, where did you get the manifold from?

[BHDave]

Thats some nice numbers carl.

Out of interest, were the 3037 results above with the stock manifold and modified stock rear housing? Yours had the old T04s comp wheel/.7 cover right?

[sinistaGTR]

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.

[R31Nismoid]

Good results!

Interesting your power dips off 7300rpm, my 600hp GT30 had power right till 8000rpm on the stock cams/head. Maybe you have something to look at there?

[tridentt150v]

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??

[DVS JEZ]

could the drop off be due to valve float?

[Roy]

How do you think the 3037 would have gone with the bigger exhaust housing

[fEkuaR]

Nice figures mate must be fun to drive now

[boot_it]

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

[paulr33]

my stocker vs yours

[aDrew_C]

Might want to recheck that graph, looks like the 3037 results not the 3040.

Great results anyhow, anything over 300rwkw with a gt30 is pretty good.

[Busky2k]

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.

[bigcarl]

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!

[R31Nismoid]

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.

[Kaido]

He could still get valve float with Tomei valve springs?

Also, one more question, what kind of fuel were you using for the 24psi run?

[bigcarl]

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.

[R31Nismoid]

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

[tridentt150v]

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

[Simonster]

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 December 29, 2006 by Simonster