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Pca944
Joined: 11 Jul 2005
Posts: 180
Location: SoCal
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 Posted: Fri Feb 03, 2006 12:26 pm Post subject: 924 GTR engine |
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I was wondering what would be involved in converting a US Spec 931 engine to a 924 GTR? I realize it won't be possible to match everything but I'd be happy with only 250hp.
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1986 944 | 1978 924 (FS) | 1982 931 | 1980 931 |
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sequential
Joined: 18 Nov 2005
Posts: 500
Location: BANNED
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| Posted: Fri Feb 03, 2006 1:02 pm Post subject: |
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A stock 931 engine will do 250 ! No need for any mods but more BOOST an intercooler and of course fuel mods. A engine mangement system would make things more correct but nothing special for 250 bhp. A GTR engine is good for 500 + and for those of you who doubt that , in the 80's, Those suckers use to start from pole position in the Trans-Am series , causing that same gentolozzi character to start from behind,looking at that 24 emblem . You don't do that with less than 550 bhp.
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928 gts prototype
baby blue engine block
steam in 1,2,3,4 sometimes
cold star issues while on stands
112 whp with new 4 valve head and MIS 2 |
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Pca944
Joined: 11 Jul 2005
Posts: 180
Location: SoCal
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| Posted: Fri Feb 03, 2006 3:02 pm Post subject: |
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Well the 931 I have has been sitting for 5 years so I bought it with the intention of opening the engine up.
While the engine is out of the car I would like to get the most power of it as I can. An intercooler will be put on once I get the car running.
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1986 944 | 1978 924 (FS) | 1982 931 | 1980 931 |
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bass gt
Joined: 02 Dec 2004
Posts: 971
Location: Johannesburg for now!!
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| Posted: Sat Feb 04, 2006 5:39 am Post subject: |
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Wayne,
Would you think the stock internals(in good order!!) would be capable of withstanding 250bhp? Reason i ask is that is the upper hp limiit of the class i want to enter, and would like to fit my new top end/camshaft/EFI onto my current block, fit an S1 turbo, and arrive at the magical figure.
The most i want is 330 BHP as this is allowable at 100kg, whereas any more power and i have to add 100kg to the car. Do the math and it takes a lot more power to get back to the 330bhp/tonne figure.
Steve |
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sequential
Joined: 18 Nov 2005
Posts: 500
Location: BANNED
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| Posted: Sat Feb 04, 2006 5:34 pm Post subject: |
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| bass gt wrote: | Wayne,
Would you think the stock internals(in good order!!) would be capable of withstanding 250bhp? Reason i ask is that is the upper hp limiit of the class i want to enter, and would like to fit my new top end/camshaft/EFI onto my current block, fit an S1 turbo, and arrive at the magical figure.
The most i want is 330 BHP as this is allowable at 100kg, whereas any more power and i have to add 100kg to the car. Do the math and it takes a lot more power to get back to the 330bhp/tonne figure.
Steve |
Prepare the engine correctly ( rods etc) and in stock form , the 24 will hold 250 bhp easily. One advantage for you is that your runs are short , over revving will do more damage than big boost numbers. but the mapping has to be correct, Poor wave propagation is not your friend .
I had overrevved mine once( stuck throttle , no rev limiter) a cool decade back , spun to 9000 rpm , Tons of bent valves, but she did not come apart.
_________________
928 gts prototype
baby blue engine block
steam in 1,2,3,4 sometimes
cold star issues while on stands
112 whp with new 4 valve head and MIS 2 |
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924 FAQ (Technical)
