How would you build a 1000 hp 928 motor.
06-09-2009, 11:54 PM
#76
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Brett, you mike like this?
https://rennlist.com/forums/928-foru...ts+won%27t+run
I didn't read the whole thing, but I suppose he got 1000 HP from his 928?
https://rennlist.com/forums/928-foru...ts+won%27t+run
I didn't read the whole thing, but I suppose he got 1000 HP from his 928?
06-10-2009, 12:23 AM
#77
In Your Face, Ace
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Criteria:
1. Has to be a 928 block
2. No nitrous
3. Has to be streetable, not necessarily a daily driver, but drivable.
4. Actual 1000 BHP, not the equivalence by making the car lighter
What year/block would you use, OB? S4? GT? GTS?
What internal modifications, ie stroker, compression, etc?
What external modification, injectors, ITB, etc?
What power adder(s), turbo, twin turbo, SC, twin SC, or combination?
How durable would this motor be?
Also, what about the rest of the driveline, what clutch, TT, transmission, gearing, etc?
Ballpark cost of your entire driveline?
And lastly, what model would you put the engine in?
I'm trying to make a list and plan of action for when I'm rich.
1. Has to be a 928 block
2. No nitrous
3. Has to be streetable, not necessarily a daily driver, but drivable.
4. Actual 1000 BHP, not the equivalence by making the car lighter
What year/block would you use, OB? S4? GT? GTS?
What internal modifications, ie stroker, compression, etc?
What external modification, injectors, ITB, etc?
What power adder(s), turbo, twin turbo, SC, twin SC, or combination?
How durable would this motor be?
Also, what about the rest of the driveline, what clutch, TT, transmission, gearing, etc?
Ballpark cost of your entire driveline?
And lastly, what model would you put the engine in?
I'm trying to make a list and plan of action for when I'm rich.
I'd run it in an OB with a transmission from a GT and a spec 2 or 3 clutch from Carl.... I'm guessing about 30-35k to do everything and plenty of extra on hand to repeatedly replace drive line parts.
06-10-2009, 01:10 AM
#78
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If you have a 1000hp (turbocharged
) 928 (which I think is entirely possible) and you go thru an intersection that a car ran the light you would hopefully have the boost controller turned down for normal driving. Boost controls don't give the car a dual nature, they give it as much power as you twist the **** up to you're threshold (meaning what the engine/car can take).
) 928 (which I think is entirely possible) and you go thru an intersection that a car ran the light you would hopefully have the boost controller turned down for normal driving. Boost controls don't give the car a dual nature, they give it as much power as you twist the **** up to you're threshold (meaning what the engine/car can take).
06-10-2009, 06:41 AM
#79
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Sure it could be done, Colin has the right idea, but I agree with BB79 it would ruin a good car, sure go with a John Kuhn twin turbo kit on a stroker, find say 700 hp and be plenty scared with that ! Forget peak horsepower, a bit less power and more drivability will be much more satisfying.
Cheers Roy
Cheers Roy
01-20-2012, 12:49 PM
#80
agree
1000 hp at crank? Interesting question.
I assuming a whole lot below and punching numbers to various web calculators.
To get 1000 hp at 12.5 AFR and 0.55 BSFC, one needs to flow about 1600 SCFM of air. To fit that in a 5.0 liter engine that has a natural VE of 90% at 7000 rpm, one needs about 34 psi of boost. Two GT3582R turbos would deliver that, about 7000 lb/h at a pressure ratio of 3.3. With 72% efficiency, the air coming out of those turbos would be about 380 F, so one would need two big air-to-air intercoolers. Let's say one would get the temperature down to about 150 F with those. Static compression ratio of say 7.5, moderate size cam (say 270 duration measured at 0.005"), and race gas might do it. Then, one would need about 100 lb/h rated injectors and 67 psi fuel pressure to be able to get the duty cycle to 90% or below. One would need a serious fuel pump to flow, for example the biggest from Fuelab. A rpm and gear based boost control, and a whole lot of tuning should get one there.
I think 1000hp is pushing it a bit.
I assuming a whole lot below and punching numbers to various web calculators.
To get 1000 hp at 12.5 AFR and 0.55 BSFC, one needs to flow about 1600 SCFM of air. To fit that in a 5.0 liter engine that has a natural VE of 90% at 7000 rpm, one needs about 34 psi of boost. Two GT3582R turbos would deliver that, about 7000 lb/h at a pressure ratio of 3.3. With 72% efficiency, the air coming out of those turbos would be about 380 F, so one would need two big air-to-air intercoolers. Let's say one would get the temperature down to about 150 F with those. Static compression ratio of say 7.5, moderate size cam (say 270 duration measured at 0.005"), and race gas might do it. Then, one would need about 100 lb/h rated injectors and 67 psi fuel pressure to be able to get the duty cycle to 90% or below. One would need a serious fuel pump to flow, for example the biggest from Fuelab. A rpm and gear based boost control, and a whole lot of tuning should get one there.
I think 1000hp is pushing it a bit.
01-21-2012, 08:43 AM
#81
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These guys in Germany are building 1200 hp cars on basis of the 997. Why not a 928?
http://9ff.de/en/9ff-gturbo-special/...o-special.html
Ake
http://9ff.de/en/9ff-gturbo-special/...o-special.html
Ake
01-21-2012, 09:32 AM
#82
928 Collector
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The bottom is not robust. We have issues at 350bhp. Oiling issues, bearing issues, the list is long. A 996 is a very different motor. Designed for boost for decades. Boxer, horizontally-opposed cylinders. Nothing like a V8.
01-22-2012, 08:18 AM
#83
Turbocharging a 928
No motor can sustain an oil starvation.But Porsche did a Lemans entry with a 924 gtp 2.5 16v.turbo 450-500 hp with half of that motor.My point is that electronics make the difference.I turboed a 3lit 16valve and with stock internals with just a spacer within two wide fire ring gaskets and race ware studs i boost it to 1.6 bar with no problems after 5000 km with frequent blasts to 280 km and once or twice over 300.in a straight though There are no roads for fast sweepers here.I m turbocharging a 928s4 for the first time and ill let you know about the results.but awas astonished with the me/be m119 motor tha i got for my 928 and i could not fit it, i think is the best v8 (sodium filled valves. vct hollow cams. 6 main bolt mains yes 6. closed deck alusil block 340 hp and 47 kg torque and 25 kg lighter than 928, and that same motor won Le mans 4 times in 840 hp 16 valve form and once in 32valve 960 hp when turbocharged(SAUBER SILVERSTAR).Mechanically its bottom looks inferior to the 928 i dont really know what couses the bearings to fail, oil starvasion? is not a matter of load for sure because 944 has the same type of bearings. and i charge them with 140 hp per piston with no issue.
01-22-2012, 08:24 AM
#84
Turbocharging a 928
No motor can sustain an oil starvation.But Porsche did a Lemans entry with a 924 gtp 2.5 16v.turbo 450-500 hp with half of that motor.My point is that electronics make the difference.I turboed a 3lit 16valve and with stock internals with just a spacer within two wide fire ring gaskets and race ware studs i boost it to 1.6 bar with no problems after 5000 km with frequent blasts to 280 km and once or twice over 300.in a straight though There are no roads for fast sweepers here.I m turbocharging a 928s4 for the first time and ill let you know about the results.but awas astonished with the me/be m119 motor tha i got for my 928 and i could not fit it, i think is the best v8 (sodium filled valves. vct hollow cams. 6 main bolt mains yes 6. closed deck alusil block 340 hp and 47 kg torque and 25 kg lighter than 928, and that same motor won Le mans 4 times in 840 hp 16 valve form and once in 32valve 960 hp when turbocharged(SAUBER SILVERSTAR).Mechanically its bottom looks inferior to the 928 i dont really know what couses the bearings to fail, oil starvasion? is not a matter of load for sure because 944 has the same type of bearings. and i charge them with 140 hp per piston with no issue.
