924Board.org

[tyfighter123]

Ok so I finished up my rebuild back in April and put my breakin miles on it. Here is the list of mods

-Big valve kit
-Ported head
-Bored out to 87.5mm
-New Diamond pistons 9.5:1 compression
-New solid lifters from group buy
-Reground stage 1 integral cam
-Bursch 2.5" exhaust

I also lightened the rods and the flywheel.

The ignition and fuel systems are stock.

So after the first 2000 miles I put it on the dyno. I am at 4800 ft and it was about 90 degress outside any guesses on what the wrhp and torque were.................?
_________________
Porsche 924 1977 N/A
Mustang GT/CS 2007
Porsche 924S 1987 (parts car)(cut up and recycled)
Porsche 911S 1976
Porsche 931 1980
Porsche 931 1980 (parts car)

[CorsePerVita]

25hp!
_________________
- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS

[tyfighter123]

baawwwwhhhhh.......good one
_________________
Porsche 924 1977 N/A
Mustang GT/CS 2007
Porsche 924S 1987 (parts car)(cut up and recycled)
Porsche 911S 1976
Porsche 931 1980
Porsche 931 1980 (parts car)

[ideola]

Were you pleasantly surprised or mildly disappointed?
_________________
erstwhile owner of just about every 924 variant ever made

[CorsePerVita]

[tyfighter123]

mildly disappointed.....but hoping for more...........
_________________
Porsche 924 1977 N/A
Mustang GT/CS 2007
Porsche 924S 1987 (parts car)(cut up and recycled)
Porsche 911S 1976
Porsche 931 1980
Porsche 931 1980 (parts car)

[ideola]

135BHP
_________________
erstwhile owner of just about every 924 variant ever made

[tyfighter123]

105 at the wheels
_________________
Porsche 924 1977 N/A
Mustang GT/CS 2007
Porsche 924S 1987 (parts car)(cut up and recycled)
Porsche 911S 1976
Porsche 931 1980
Porsche 931 1980 (parts car)

[morghen]

So you have like 1HP more? you need to fine tune it.
What was the torque...got a graphic?
_________________
Supercharger and EFI kits
https://www.the924.com

[Raceboy]

Dynos are so different and hp depends on number of things. Going to 1/4 mila and doing a run there (with soft launch) gives you trap speed and knowing your cars weight (total, with you etc), the online calculators even give quite accurate result.

Did you verify engines AFR abd ignition advance?
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

[nickthompson]

Considering there's about a 35% loss through the drivetrain that's not terrible. What does the butt dyno tell you?

[nickthompson]

[Raceboy]

There is nowhere near 35% drivetrain loss on 924. It is more like 15% being RWD (~20% region on AWD cars) and also depends on MANY things, for gearbox example oil temperature, wheel bearings, tires etc etc.

Like I mentioned, check the mixture at WOT with WBo2 meter and verify that your base ignition advance is correct (10 degrees BTDC on Euro cars, dunno on US ones). If Euro vs US distributors have different advance curves, swap to Euro unit.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

[Cedric]

Running at sea level would probably give you about 15% more hp, if you only take air pressure int account. Alltitude severly kills power on a n/a engine.

But thats the thing with roller dynos, the only thing you can actually compare with is a before-after run. Even things like tyre pressure will affect the results..

Get a stock 924 up on the same dyno, wih similar tyre setup, then you will have a reference to compare to.

Giving it some more sparkadvance and tuning the AFRs might get you some hp more.
_________________
1980 924 Turbo
www.instagram.com/garagecedric/

[tyfighter123]

Thanks for the replies. I started at 96 rwhp and we tuned it up to the results in the charts.



_________________
Porsche 924 1977 N/A
Mustang GT/CS 2007
Porsche 924S 1987 (parts car)(cut up and recycled)
Porsche 911S 1976
Porsche 931 1980
Porsche 931 1980 (parts car)