View previous topic :: View next topic |
Author |
Message |
DZGunner
Joined: 18 Nov 2014 Posts: 191 Location: Great white north
|
Posted: Tue Mar 24, 2015 1:10 pm Post subject: Curb Weight and Power |
|
|
What's the lowest you guys have been able to, or have heard of getting the curb weight of 931's down to.
I used a weigh station down the street from my house and got 2470lbs.
I don't know how accurate the scale is but that seems about right with all the stuff I've pulled out. My owner's manual says the stock weight is 2822lbs. So i managed to cut 352lbs of: AC, carpets, heating, rear seats (upper only), Evap system, Radio (with antenna).
As for the power; My understanding is that the 80 and below turbos made 158HP? and then the S2 setup made more, but idk if the S2's made 170 or if that was the euro models.
I'm putting a MBC in my 80 and was wondering what my power figures might look like with a stock, healthy engine at 9-10 PSI.
Thanks guys. _________________ 1979 924 (Daily driver EFI)
1979 924 Sebring
1977 924
1977 924 (Parts) |
|
Back to top |
|
|
Grenadiers
Joined: 20 Feb 2007 Posts: 3222 Location: Nelson, WI & Prescott, AZ
|
Posted: Wed Mar 25, 2015 12:46 am Post subject: |
|
|
I'd reckon the scale is a bit off! Those pulled items don't seem to add up to 352 pounds. In any case, I've had both engines in my CGT clone, and couldn't tell the difference by the seat of my pants. I also have the top mounted intercooler, and a manual boost gauge, set around 10-12psi, and a Euro turbo-charger. Rebuilding the Series II engine this summer, for one last shot at durability for the track car. _________________ '83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke |
|
Back to top |
|
|
Rasta Monsta
Joined: 12 Jul 2006 Posts: 11723 Location: PacNW
|
Posted: Wed Mar 25, 2015 1:31 am Post subject: |
|
|
My 924S race car is about 2400 with cage. I suppose the engine might be a bit lighter than the 931.
Not sure I would have deleted the defroster. _________________ Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
|
|
Back to top |
|
|
Raceboy
Joined: 01 Mar 2004 Posts: 2326 Location: Estonia, Europe
|
Posted: Wed Mar 25, 2015 2:08 am Post subject: |
|
|
2.5 engine is not lighter than 931 engine even with turbo and CIS stuff combined.
They are pretty much the same, but you can get 931 one a bit lighter when going EFI and dumping CIS. _________________ '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 |
|
Back to top |
|
|
morghen
Joined: 21 Jan 2005 Posts: 8868 Location: Romania
|
Posted: Wed Mar 25, 2015 3:08 am Post subject: |
|
|
I've scaled my gts wannabe 924 at 1170kg with a decent amount of fuel in it.
Euro model S1 makes 170hp and the S2 euro model makes 177, both no intercooler. Us models might make less power. _________________ https://www.the924.com |
|
Back to top |
|
|
fiat22turbo
Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR
|
Posted: Wed Mar 25, 2015 4:14 am Post subject: |
|
|
morghen wrote: | I've scaled my gts wannabe 924 at 1170kg with a decent amount of fuel in it. |
That's 2579.408 lbs for those that aren't metrically inclined. _________________ Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose) |
|
Back to top |
|
|
ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
|
Posted: Wed Mar 25, 2015 4:24 am Post subject: |
|
|
When we corner-weighted the Club Sport, it was dead nuts on 2500# with half a tank of gas. That's with some serious lightening, and a little weight added back in (bolt-in Redline style rollbar and top mount charge cooler setup).
US BHP figures are 150 and 158 respectively according to tech specs booklet. IMO, almost all of the power difference between US and Euro is due to the half-point less of compression and timing. I don't think much is attributable to emissions equipment as is commonly cited. _________________ erstwhile owner of just about every 924 variant ever made |
|
Back to top |
|
|
Carrera RSR
Joined: 08 Jan 2010 Posts: 2309 Location: Somerset, UK
|
Posted: Wed Mar 25, 2015 6:23 am Post subject: |
|
|
Corner weighted at 1140kg (2510lbs) with lots removed but big items added back like a full cage, half tank of fuel, 951 IC, bigger rad = more coolant etc. feels quite lively with circa 220+bhp _________________ 1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252 |
|
Back to top |
|
|
DZGunner
Joined: 18 Nov 2014 Posts: 191 Location: Great white north
|
Posted: Wed Mar 25, 2015 1:13 pm Post subject: |
|
|
ideola wrote: | When we corner-weighted the Club Sport, it was dead nuts on 2500# with half a tank of gas. That's with some serious lightening, and a little weight added back in (bolt-in Redline style rollbar and top mount charge cooler setup).
US BHP figures are 150 and 158 respectively according to tech specs booklet. IMO, almost all of the power difference between US and Euro is due to the half-point less of compression and timing. I don't think much is attributable to emissions equipment as is commonly cited. |
Whats the timing set at for euro models? _________________ 1979 924 (Daily driver EFI)
1979 924 Sebring
1977 924
1977 924 (Parts) |
|
Back to top |
|
|
Rasta Monsta
Joined: 12 Jul 2006 Posts: 11723 Location: PacNW
|
Posted: Wed Mar 25, 2015 3:12 pm Post subject: |
|
|
Raceboy wrote: | 2.5 engine is not lighter than 931 engine even with turbo and CIS stuff combined. |
Can't imagine how a cast iron 2.0 block is anywhere near the weight of an all alloy 2.5. Yes, it has two balance shafts, but it doesn't even have main bearing caps and the crank girdle weighs less than the Sunday paper! _________________ Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
|
|
Back to top |
|
|
Raceboy
Joined: 01 Mar 2004 Posts: 2326 Location: Estonia, Europe
|
Posted: Wed Mar 25, 2015 4:11 pm Post subject: |
|
|
I have both blocks sitting side by side in the garage, it is not a guess.
2.5liter block is much bigger (=much more material) and 2.5 liter crank weighs much more than 2.0liter crank. _________________ '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 |
|
Back to top |
|
|
Cedric
Joined: 27 Aug 2004 Posts: 2600 Location: Sweden
|
|
Back to top |
|
|
Shurick
Joined: 15 May 2005 Posts: 524 Location: Russia, Moscow.
|
Posted: Wed Mar 25, 2015 4:35 pm Post subject: |
|
|
Rasta Monsta wrote: | Raceboy wrote: | 2.5 engine is not lighter than 931 engine even with turbo and CIS stuff combined. |
Can't imagine how a cast iron 2.0 block is anywhere near the weight of an all alloy 2.5. Yes, it has two balance shafts, but it doesn't even have main bearing caps and the crank girdle weighs less than the Sunday paper! |
Porsche 924 tech specs lists dry weight for a 931 engines: 165 kg.
Porsche 944 workshop manual lists dry weight for 8v 944 engines: 166 kg.
I was shocked too.
BTW, euro 924 engine (XK) weights only 136 kg. _________________ WBR, Shurick
'79 931 -- intercooled K26-3060-6.10 turbo @ 1.2 bar, EFI+EDIS, 951S brakes, stripped interior, 951 look.
'86 924S -- R.I.P.
https://www.instagram.com/ru_pacecar/ |
|
Back to top |
|
|
morghen
Joined: 21 Jan 2005 Posts: 8868 Location: Romania
|
Posted: Wed Mar 25, 2015 7:57 pm Post subject: |
|
|
hmm, here i was thinking i have a light 924 when actually its one of the fattest _________________ https://www.the924.com |
|
Back to top |
|
|
Rasta Monsta
Joined: 12 Jul 2006 Posts: 11723 Location: PacNW
|
Posted: Thu Mar 26, 2015 2:05 am Post subject: |
|
|
Raceboy wrote: | 2.5 liter crank weighs much more than 2.0liter crank. |
Certainly true. . .the crank is beastly. _________________ Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
|
|
Back to top |
|
|
|