W-series engine has 8.3:1 compression (ratther than 7.8:1)
it has better cooling passages
it has larger cams (especially the japanese and euro spec)
it has floating wrist pins, rather than fixed
it is an overall stronger engine
I ran 16 psi non intercooled testing the limits and trying to blow it up (I had a better badder J-spec W-series lying around) It never flinched. I popped a radiator hose racing a 12 second fox body mustang (5.0 style) and dicided I had abused the damn thing enough.
The factory T3 turbo loses efficiency at 12.5 psi. This doesn't mean you will not make more power at a higher pressure, it just means it doesn't make as much Hp per extra pound of boost. I would recomend running 12.5 psi non intercooled, and 14-16 intercooled. If you are running more than 12 ish psi, I would recomend getting something as far as fuel goes. A Z32 twin turbo fuel pump drops right in, or you can get a walbro. AN FMU (fuel managment unit) is a ghetto cheap band-aid, but it works. A greddy AVC-R or APEXi S-AFC (electronic fuel controlling devices) and a good fuel pressure regulator will work as well, but you are still using stock injectors, it needs to be tuned, and it is an electronic band-aid. If you want more info, or want to know the RIGHT way to controll fuel, e-mail me T66Z31@yahoo.com
man i just busted both head gaskest on my Z running 14.5psi w/ 9.0 pistons. will puttng the dished pistons back in increase horsepower or decrease it. W/ the 9.0 in it has hella take off power and looses traction when the turbo spools up i would like to keep the power but i dont want to be replacing head gaskets all the time in it
Z31.com agrees. So do I , for the most part , but I think the turbo and the ECU can handle more. But the fuel pump definitely needs to be upgraded. A Walbro 255 is sufficient , and out pumps the TT 300Z/GTR fuel pump by a few lph.
Actualy the TT pump out flows the walburo and GTR by a little. I have the flow curves if you want.
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W-series engine has 8.3:1 compression (ratther than 7.8:1)
it has better cooling passages
it has larger cams (especially the japanese and euro spec)
it has floating wrist pins, rather than fixed
it is an overall stronger engine
I ran 16 psi non intercooled testing the limits and trying to blow it up (I had a better badder J-spec W-series lying around) It never flinched. I popped a radiator hose racing a 12 second fox body mustang (5.0 style) and dicided I had abused the damn thing enough.
The factory T3 turbo loses efficiency at 12.5 psi. This doesn't mean you will not make more power at a higher pressure, it just means it doesn't make as much Hp per extra pound of boost. I would recomend running 12.5 psi non intercooled, and 14-16 intercooled. If you are running more than 12 ish psi, I would recomend getting something as far as fuel goes. A Z32 twin turbo fuel pump drops right in, or you can get a walbro. AN FMU (fuel managment unit) is a ghetto cheap band-aid, but it works. A greddy AVC-R or APEXi S-AFC (electronic fuel controlling devices) and a good fuel pressure regulator will work as well, but you are still using stock injectors, it needs to be tuned, and it is an electronic band-aid. If you want more info, or want to know the RIGHT way to controll fuel, e-mail me T66Z31@yahoo.com
I think different intake ports as well. Smaller and straighter. As far as strength, I don't think there is any difference. The cooling differences are the addtion of some stream holes in the block deck, head and head gasket.
In racing at least, there it is not considered to cool better.
You have to be careful with the AFC, if you trim fuel too much, you can end up in a more advanced cell on the spark map. This makes a AFC good for only minor tuning and you must be careful for signs of overadvanced timing.
I would tend just to tweak an FMU using a wide band to monitor the A/F ratio.
What I would really do if I had little money is JWT ECU, JWT POP, Manual boost control set to 14 psi, blocked of POV, Starion Intercooler from junkyard and a 3' exhaust, walburo fuel pump, recirculated compressor bypass valve, Nismo adjustable pressure regulator.
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Last edited by morepower2 : Aug 26th, 2004 at 12:37 PM.
man i just busted both head gaskest on my Z running 14.5psi w/ 9.0 pistons. will puttng the dished pistons back in increase horsepower or decrease it. W/ the 9.0 in it has hella take off power and looses traction when the turbo spools up i would like to keep the power but i dont want to be replacing head gaskets all the time in it
With proper engine managment you can. Heck with a proper everything you can have amazing power and bottom end.
Hardly anyone relalizes the pontential of the VG30ET
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I'm not so sure about the Starion intercooler; yes it will work but several people have had issues with these intercoolers down the road. I would only really trust the Supra TT intercooler (unless buying aftermarket of course). But then again the Spearco unit is my favorite even though it is quite pricy.
A Z31T with the Nismo race heads, custom schnieder cams, JWT ecu, 555cc injectors, TT fuel pump, upgraded turbo, VG30DETT crank with aftermarket VG30DE forged rods and forged pistons, custom reworked plenum, 3 inch exhaust, Cobra MAF, a good ignition, Fidanza lightweight flywheel and exedy clutch, spearco intercooler, and better valves and valve springs. Of course it needs a good radiator and the HKS exhaust manifold. Of wait I think those are the parts going on my car heh. I need to finish deciding about the cams and the turbo and start ordering parts. of course I am doing alot more work then just this I didn't list everything. I am not sure when the car will be done but it will be awhile. It is just sitting in my garage. I am in the process of getting the Nismo 350Z wheels and I am going to redo everything chasis and suspension wise and even upgrade the brakes some more.
I'm not so sure about the Starion intercooler; yes it will work but several people have had issues with these intercoolers down the road. I would only really trust the Supra TT intercooler (unless buying aftermarket of course). But then again the Spearco unit is my favorite even though it is quite pricy.
A Z31T with the Nismo race heads, custom schnieder cams, JWT ecu, 555cc injectors, TT fuel pump, upgraded turbo, VG30DETT crank with aftermarket VG30DE forged rods and forged pistons, custom reworked plenum, 3 inch exhaust, Cobra MAF, a good ignition, Fidanza lightweight flywheel and exedy clutch, spearco intercooler, and better valves and valve springs. Of course it needs a good radiator and the HKS exhaust manifold. Of wait I think those are the parts going on my car heh. I need to finish deciding about the cams and the turbo and start ordering parts. of course I am doing alot more work then just this I didn't list everything. I am not sure when the car will be done but it will be awhile. It is just sitting in my garage. I am in the process of getting the Nismo 350Z wheels and I am going to redo everything chasis and suspension wise and even upgrade the brakes some more.
Are Supra TT intercoolers easy to find in junkyards/used nowdays? What goes wrong with starion i/c's? I know a lot of people that use them with no issues.
Nismo does not make VG30E race heads. A ported head is avlaible through Nissan Motorsports but that is not connected to Nismo.
I would recomend a VG33 over a VG30. The torque produced when boosted is amazing.
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What I would really do if I had little money is JWT ECU, JWT POP, Manual boost control set to 14 psi, blocked of POV, Starion Intercooler from junkyard and a 3' exhaust, walburo fuel pump, recirculated compressor bypass valve, Nismo adjustable pressure regulator.[/quote]
Damn, that sounds like what I have. I have the TT supra intercooler though.
Are Supra TT intercoolers easy to find in junkyards/used nowdays? What goes wrong with starion i/c's? I know a lot of people that use them with no issues.
Nismo does not make VG30E race heads. A ported head is avlaible through Nissan Motorsports but that is not connected to Nismo.
I would recomend a VG33 over a VG30. The torque produced when boosted is amazing.
I have a supra IC for sale-$100
The starion cores flow very poorly, and power is limited. I'd really like a trick liquid/air IC setup... I live in texas, so ambient air is not that cool. The 33 would be the block to build, as you get 10% more power for free. I just need to find the pathfinder upper plenum and distributor.
I have a supra IC for sale-$100
The starion cores flow very poorly, and power is limited. I'd really like a trick liquid/air IC setup... I live in texas, so ambient air is not that cool. The 33 would be the block to build, as you get 10% more power for free. I just need to find the pathfinder upper plenum and distributor.
Do you mostly get a supra core from supra guys who have upgraded?
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I'll take your word for it. Pretty sure someone here or on the net told me otherwise , but who knows.
I have an engineer buddy at walburo that tested it and he sent me the data. The 255 is a lot cheaper though and the flow differences is very small between the two.
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I have an engineer buddy at walburo that tested it and he sent me the data. The 255 is a lot cheaper though and the flow differences is very small between the two.
Probably just stick with the Walbro idea then. It should support the Hp I have in mind anyway. Do the fuel line sizes need to be raised to get around 450-500 Hp? I know this is an issue with certain other makes of cars.
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1992 Yamaha FZR 1000. 145 Hp, all stock..
i would like to keep the power but i dont want to be replacing head gaskets all the time in it
It really does flow well. It is quite noisy but I don't really care about that.
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