924Board.org

924guy · Posted: Thu Apr 01, 2010 8:50 pm Post subject: who has recent dyno test stats?

anyone have recent dyno test results? out of curiosity id love to see unmodified results, us vs. row , modified and what has been done, vs stock .. for both the 931 and the 24..
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Eric
78 924
82 931 SE "smokey"
99' VehiCross
Y2K Honda Insight
http://www.cardomain.com/id/924Guy
Performance by Pasha

Rich H · Posted: Thu Apr 01, 2010 9:20 pm Post subject:

Yes, Unmodified ROW 932 S2 1980:

Rich
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

Cedric · Joined: 27 Aug 2004 Posts: 2608 Location: Sweden

If its done on rollers its almost impossible to compare figures, just to uncertain. Before and after on the same dyno, same tyres,same tyre pressure etc can though be useful.

I will probably do a dyno test this summer on a dyno like this:

What do you call them in english? This to have some more consistent results, so I can measure before and after some tuning and see that the power graph looks like it should.

Anyone maybe have some results from a dyno like this?
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1980 924 Turbo
www.instagram.com/garagecedric/

Rich H · Posted: Thu Apr 01, 2010 9:50 pm Post subject:

Hub dyno.

Eliminates the effects of tyres
_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

emoore924 · Joined: 13 Apr 2004 Posts: 2815

I think some old runs I did are around here someplace...

search and ye shall find.

Cedric · Joined: 27 Aug 2004 Posts: 2608 Location: Sweden

I wonder if there is a measurable difference between a swedish and UK ditc box, I have both in the garage so if I get enough runs for my bucks I will test both, will probably also test KN air filter vs stock (I run stock filter but got a KN with the engine). Maybe I could get a friend of mines 931 s1 in the same dyno, would be very interesting to see..

So if I just can get my boost back I will reserve a time in the dyno sometime in the forthcoming weeks. I reaaallly hope the loss of boost was due to the broken seal in the bypass, or else I dont know what to do since everything else works

.
_________________
1980 924 Turbo
www.instagram.com/garagecedric/

Rich H · Posted: Thu May 06, 2010 7:17 am Post subject:

Unmolested S1 on the same dyno as mine on the same day got peak of 160 at the flywheel.
_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

9xx · Joined: 18 Jun 2006 Posts: 627 Location: Jarvenpaa, Finland

Just booked a dyno session, May 29th. I'll post the results here. Anything over the stock 177hp would be OK with stock boost + IC.
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Mikko

All gone: 931 '82 Alpine White, original option "220" G31 with LSD + 3 x 944

morghen · Joined: 21 Jan 2005 Posts: 8879 Location: Romania

I think i'll have a go this summer too..

I'm using:
-FMIC
-1bar
-port matched intake
-K27/26 turbo
-937 DITC

So it should put out more than stock...how much..i'm dead curious.

Rich, so you're 4HP lower than factory? thats ok giving the fact you did the test on rollers.
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https://www.the924.com

Carrera RSR · Joined: 08 Jan 2010 Posts: 2309 Location: Somerset, UK

These two results were using the the same RoW S1 engine (I assumed its was an S2 but once pulled apart I learned it had S1 pistons and therefore circa 7.5:1 CR. The first using S2 DITC, same CGT spec turbo running circa 0.7 bar. The second running same engine and turbo in S1 car running stock dizzy running again 0.7 bar

3 runs in the S2 prior to the engine being pulled. With 944 FMIC and DITC it gave 193, 195 and 197bhp over the runs. I just have the 193bhp print out.

3 runs in the S1. Without an IC and S1 ignition. It gave 165,167 and 168bhp.

The only real difference was the FMIC and ignition. On the same rollers about 2 weeks between each other.

My new engine running forged pistons with 8.2:1CR, 944 FMIC, CGT rebuilt turbo and circa 0.7 - 1.0 bar will be dyno'd in the coming weeks.
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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

morghen · Joined: 21 Jan 2005 Posts: 8879 Location: Romania

horsepower dropping(s) from 4000RPM? runing rich at top end?
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https://www.the924.com

WEASEL149 · Joined: 19 Aug 2005 Posts: 595 Location: UK, Sheffield

First chart and the engine was making as much torque as a 951.

There's a lot of potential with intercooling and tuning.

The S1 engine was set-up very 'safe' by Porsche with low CR, conservative timing and very rich mixture on boost.
Most of this safety net isn't needed once you have the front-mount intercooler in place.

It will be very interesting to see what your new set-up achieves Steve.
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1979 UK 932

Raceboy · Joined: 01 Mar 2004 Posts: 2326 Location: Estonia, Europe

Probably have seen it before, but here's a turbocharged 924 NA (9.3:1 CR, IHI ball-bearing turbo @ 0.9 bar, 951 IC, VEMS EFI) dynosheet.
Power (hp) and torque (lb/ft) is measured at the wheels.

Since then did more tuning (added few degrees of timing and later used xylene/gas mix and even more agressive timing), now sold.

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'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.
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Carrera RSR · Joined: 08 Jan 2010 Posts: 2309 Location: Somerset, UK

9xx · Joined: 18 Jun 2006 Posts: 627 Location: Jarvenpaa, Finland

So now the output is measured: power 134 kW (182 hp) and torque 276 Nm @ 0.79 bar of charge pressure. Engine output, not from wheels. Run surprisingly well on the dyno and by this I mean it didn't brake, explode, smoke or cause any hellish devastation.

Boost peaked at 0.79 bar and then dropped ever so slightly, maybe to 0.77. A/F ratio was steady and there was no knock detected.

The guy who performed the test thought that it is running on a rich side a bit but we didn't made any adjustments because slightly rich ratio is better than lean ratio and now there seems to be some room higher boost pressure?

Some thoughts: day was warm, the shop was warm and the cooling system on dyno blew air more like under the car, not over. There was some airflow going to the IC vent too but the IC itself got somewhat warm and I felt perhaps it didn't work as well as it could have been. There is some power missing on the upper rpm range if you look at the picture. Any thoughts about that?

picture:

VIDEO:

http://www.youtube.com/watch?v=QfTAp5D_56w&feature=youtu.be
_________________
Mikko

All gone: 931 '82 Alpine White, original option "220" G31 with LSD + 3 x 944