187

180 rwhp.

...::: UPDATE :::...

Engine Installed Photo

Car is running rich with 150 main jets according to my "narrow band" a/f gauge (temp setup just to check things out).

Carbs are synchronized, car is running great. Pulls hard to 6500 rpms, idles great, very nice throttle transition/response.

MB911's muffler makes all the right noises/sounds...

I think I'm either going to go to 38mm chokes or 140 main jets (I'll have to consult Richard at PMO for advise).

I've had a "slight delay" in getting this car tuned and on the dyno as my wife had a baby boy last Monday (our 3rd boy!).... But I'm back on track :-)

Here's a pic:

http://www.tonygarcia.org/911SC/911SC_Engine_Comp.jpg

TonyG

Coingrads on the new baby! Seems like you should name him Carrera or something :)

Cars looking good too.

Hey!!!! No fair changing the choke size until you report the HP numbers!!!!

jluetjen

>>>Hey!!!! No fair changing the choke size until you report the HP numbers!!!!<<<

Agreed. If I change the choke sizes, it will be on the dyno after I dyno the 36mm chokes.

I was just reporting my findings thusfar....

BTW: What do you think about 38mm chokes on this mild combo?

TonyG

I don't think that it will make a big difference in your top-end HP given that your ports are 34 mms -- and thus gating the airflow. Larger venturi may cost-you some low-end driveability - or not. It's an easy change to make while you're on the dyno. So only testing will tell.

Ummm...no rash decisions until you've gotten used to late-night feedings. :D

Seriously, given the rather mild condition of your engine, I think 38mm chokes would probably hurt your low-end torque. It all depends where and how you drive your car.

After checking my numbers, I agree with dd74 -- I think that the larger chokes will hurt your low end driveability some. The gas speeds through the venturis isn't that high even with 36 mm venturis.

The reason I ask about the 38mm chokes is because when I used to build and race Datsun 510/240Z engines, I used 36mm chokes on 400cc cylinder setups (example: L16 = 1600cc - 400cc per cylinder) which was about right for a 3500rpm-7000rpm setup.

The 3.0 SC engine is 500cc per cylinder yet I'm setup with 36mm chokes....

Given this, isn't 38mm chokes more appropriate?

Right now the power is very linear from 1000rpms up through 6500rpms.

TonyG

Only if the venturi are gating the intake system. Keep in mind that your intake ports downstream of the carbs are 34 mms.

jluetjen

>>>Only if the venturi are gating the intake system. Keep in mind that your intake ports downstream of the carbs are 34 mms.<<<

Uh... yeah. Time to put my thinking cap back on :-)

dumb question (especially when you know the answer)

TonyG

Is this off of the "pants dyno" or the roller dyno?

jluetjen

That would be the seat-of-the-pants DynoJet :-)

(perhaps after coming from turbo charged cars everything feels linear :-)

TonyG

which would mean you have numbers ... ? :D

KobaltBlau

No numbers yet. The seat of the pants dynojet is my butt. :-)

I do have numbers for my old 944 turbo, but it's not relevant here...

TonyG

I think you have to take the top of the carbs off, and remove the aux venturie to change the chockes on Webers. I've never been able to do that quickly, and I'm too cheap to do that while on the clock at a dyno.

JP

So...any word?

http://forums.pelicanparts.com/showthread.php?s=&threadid=178550&perpage=10&pagen umber=1

What do you bet that 187 is a bit lower considering the intakes on an '83 are smaller than on a '78?

Hey I didn't bet 187. I am a bit higher:)

No, but me and KevinS both bet 187. I called it first. I also saw a 186 and a 188 too, so I'd have nail it to get the gas anyway. I hope I'm way low.

Good luck,

JP

Filled up the truck today. Sheeeesh...a full tank of gas would be nice any day.

I hope Tony hits 250!

Ummm...what's the math again to figure out hp at the crank when based on rear-wheel? I'm horrible with numbers.

What's 187 rwhp at the crank?

assuming a 15% driveline loss

RWHP
------- = Bhp (crank horsepower)
.85

TonyG

easy way is work back wards...220 SAE @ crank x 15% =33
220-33 =187 SAE rwhp

But we were betting on @ the wheels numbers on a dynojet, right?

The contest is Rear Wheel Hp, SAE Corrected, on a DynoJet 248C.

TonyG

Sorry JP, didn't notice your post before mine for a guess at 187. I hate to take a decimal place on this so will have to go back and look, and try again. I think 187 for RWHP is a good one though...

when are you going? :cool:

saw this too late...my bet is 189 RWHP

...::: UPDATE :::...

Looks like the dyno session will occur this Saturday.

The contest will remain open until I post, "Contest Closed", the post the results, and the winner.

So post on!

TonyG

PS> I just pulled the windshield, dash, lower dash, and all the gauges, along with the carpet, seats, rear quarter panels, rear deck panel. I'm starting my installation of the 993 interior. Looks like the top dash fits in fine, but the bottom dash is going to take some work on the sides :-( Anybody have close up pictures of the sides of the lower dash on a 993... specifically, I pics of the side vents and the side of the lower dash, and a pic of the lower dash as sitting from the passenger seat (for height purposes).... it's a bigger job than I thought!

Ok, I went thru the thread and checked and it looks like

190 RWHP

is still open so I'm taking that!

194. Uh, if I win, can I have the money go toward my motor work instead of gas? It's a good charity, I promise.

By the way, this is one of the most interesting technical threads I have read in awhile. Kudos!

186 at the wheels.

Nice looking engine!

192 rwhp.

I wanted 190, but I dont want to split the pot with anyone :)

24 hours to go!! Looks like we have a good spread!

We start @

172
178.5
180
186
187 (twice but Kevin bailed ;)
188
189 (twice)
190
191
192 (twice)
194
196
200
205
207.5
208
210
214
215
231.6

Shuie check this one out..

can I get in at 193 :)

Damn the luck!

I guess a split would work fine since I didnt have to place a bet in the first place. I'll just double up on the next one :)

Tony you are killing me here. You let those boys side track you again?

Well???? http://www.pelicanparts.com/support/smileys/wat3.gif