Dyno time tomorrow, anyone care to guess what the h.p. numbers will be?
 

I will be taking blue car tomorrow to get dyno tested and sniff tested to check the mixture.

Here are the particulars of the engine if anyone cares to guess the hp numbers.

3.0 litre, mahle pistons 9.3:1 c.r.
Heads mildly ported by Competition Engineering (not race ported)
Elgin Mod S cam...supposed to be the same grind as GE60
Weber 40's
SSI and factory dual in single out muffler
MSD box and blaster coil w/ re-curved distibutor.

Any guesses?

Gawd I love these games! I'm betting, well not betting because bettings illegal,, but I'd say uhmm, 264 rwhp fully corrected for a full moon and light winds from the south.

225 rwhp.

229.7812 rwhp, with corrections for an overcast sky, east wind blowing & high humidity while using 15.912999900294% to calculate transmission losses.

i agree with fastred....between 220-230 rwhp

222.6hp at the hubs (on a Dynapak).

I've got a short stroke 3.2 with more compression, twin plug but only S cams and same exhaust. I took my 245hp (at the hubs), deducted 10hp (for compression, cams, and EFI too - forgot that), then assumed 3 litres instead of 3.164.

Me = geeeeeek.

WAIT. Revised guess. Deduct another 10hp for wheel dyno not hub dyno.

213rwhp.

216. That's my final answer

210HP

I'd be shocked if it broke 200...

I would guess 196 at the rear wheels (however I hope that I am wrong, and on the low side).

194 until you get it tuned - then 208

Dyno Day postponed, work got in the way. Hopefully I will be on the dyno Mon or Tues. I'll post the results then.

jtkkz is the BIG WINNER.

I would post the graph but I can't open the file ...got a copy on diskette.

results are as posted
run 1. max power 210.2 max torque 199.1
run 2 max power 210.7 max torque 197.9
run 3 max power 210.1 max torque 195.4

max torque was acheived at approx 4700 rpm
max power was acheived at approx 6100 rpm

For a refernce point the 993 that was on right before me pulled 240

Are these results at the rear wheels?

Remember that dyno #s are not absolutes. Their true use is only as a comparison on the same dyno under the same conditions.

The comparison of the 3 liter 211# to the 993 3.6 liter 240# is likly valid. It shows that you have a very healthy 3 liter. It would also be useful to take a look at the torque curves, That is where the bigger engines shine.

By the way was the 993 a '95 or a vram '96-98?

208 flywheel, or 177 rwp.

200 HP delivered to the rear wheels at maximum HP point.

The results posted were at the rear wheels. The test was conducted on a dyno-jet. Factoring a 15% loss through the drivetrain gives about 241 HP at the crank.

Something else to note that was actually commented on by folks at the shop is how much quicker my 3.0 w/ cams/carbs etc. reved up compared to the newer stock cars.

Bill, I don't know what year the 993 was.

~240hp out of a 3.0 is pretty impressive! About how much HP gain would you attribute to each of your upgrades? I am assuming about 180hp in stock us spec form.

Casey, I can't really answer that. I know that you can find some of the info in Bruce Anderson's book, particularly the addition of carbs and exhaust ...what did he write like 20 or 25 hp for that one?

Everything designed to work in concert so I can't really seperate out the hp increases.

The engine I had built is a pretty good "budget hot rod motor". I would have liked to increase the displacement to 3.2 litre but this would have added around $3,000.00 to the price of the job. I was lucky in that Andial had some loose (no cylinders) 95mm high dome pistons w/ valve pockets that fit my original cylinders perfectly.

anyway, it makes for a fun motor ...now on to the suspension for my next project.

I was going to call it 235 at the flywheel, so I would say you've done really well here. Enjoy that motor! Sounds like a lot of fun.

Bingo!, So many people put a hp figure on each little thing. It doesn't work that way!! The pistons, headers, cams and induction are all working in concert.

I have posted numerous times about this. The late smog motors respond really well to cams & headers but are limited by the induction.

Ideal is cams, headers, pistons, valves, Motec and all the other little bolts and dodads, but then you have a $25-30k motor

Yeah - you did very well (I was close at 213hp!)

I had second thoughts afterwards - the "factory" version of that engine was the 3.0RS, which made 230hp. You seem to be about 10hp up on that despite webers not MFI.

I think the best way (bear in mind I am not an engineer or mechanic - just some guy) to look at these cars is HP/litre basis. Porsche managed around 80 hp/litre from S cams depending on the engine (smaller engines with closer to 85hp). Any figure beyond that had better have good reason (eg my engine has twin plug and 10.5:1 c/r, with EFI, for approx 85hp/litre).

Here I am 17 plus years later and many miles with redline being hit just about every time I drive it. This includes multiple track days, a7-8 times running very hard in the Hill Country Rally, Road to Rennsport Rally plus track day time at the reunion etc. ...in other words this thing is not babied.

The engine has not really been touched except for routine maintenance and a few years ago our friend Jamie Novak converted this thing from carbs to EFI for me. ...took a bit to get right and it runs quite nice but after looking at the dyno sheet and AFRs both Jamie and I think we can get a bit more torque out of it. (not max torque just accross the RPM band)

So looking back at this post the numbers were around 211 RWHP and about 200 for torque. So 17 years after this post and those dyno runs and this Mayo Performance built motor (built 1997) is putting out 223 RWHP and 205 max torque. For reference there was a few 964s that ran on the dyno the other day with me. Stock with Steve Wong Chip put 229 RWHP. Fresh 3.8 with 993 RS cams put down 261 RWHP. PORSCHE There is no substitute!

^^Thats a great story. You’ve had a great run with that car- congrats!

Good numbers Jay, my guess was 255 at the crank , you got 261
William said 220 at the wheels , you got 222
well done , looking forward to more ripping around the country with you
Ian

ah yes, i remember your car jay. i was right in front of you at buttonwillow, quick little bugger.

that was a fun day.

and a big +1 for not babying these lumps...

Interested to know what was behind your decision to go from carbs to EFI. I am looking to get rid of CIS in the near future and was considering both (leaning toward carbs).

Horsepower and drivability both increased. Carbs are great and inexpensive plus the average mechanic can work with them but EFI is so much better.

Yes... great fun. Car is running so much better now. We had some issues that week with the EFI setup. All better now!