How much power do you have? How did you get there?

[TurboKraft]

Originally Posted by 9Thirty

I was told that the dyno at the speed shop which is a Dynapack was nicknamed "the hearbreaker" because it reads low. It read 393 rwhp on a Mustang dyno several weeks before with a 1 bar spring. It actually was boosting 1.1 because of the unrestricted exhaust. Too much boost and advance (look at the torque!) for the fuel flow.

Approx. 385-390whp is to be expected with those engine specs.

Originally Posted by lin7310948

i took a little different route to get more power. i replaced the 3.4 liter modified turbo motor in my '78 930 with a mast motorsports drive by wire ls7 motor. the car has no frills and weighs in at a bit less than 2300 pounds.

Not for the purist, but you just can't throw rocks at those number! Nice results!

[9Thirty]

Originally Posted by TurboKraft

Approx. 385-390whp is to be expected with those engine specs.

Yea, we figured around 380 or so if you take the Mustang results and the Dynapack results, combine the two and allow for the reduction in PSI. I might be talking to you about an EFI conversion this spring...............

[TurboKraft]

Any time, we'd be happy to work with you on it, get you the next 60hp/100ft.lb. or more. :-)

[kenikh]

Currently going together:

• 98mm 8.5:1 JEs, ceramic coated
• Stock ports
• Twin plugged heads and dizzy
• Leask WUR
• Euro ('79) fuel head
• Euro heat exchangers
• K27-7006
• Zork Tube
• Andial Intercooler
• DC15 (Sport SC) cams

Any guesses on where this ends up power wise?

[Porsche 935]

3.3 litre
Flowed case
7.5-1 Cr
2.5 race cams
High butterfly ITB's
Well massaged heads
96 lb injectors
TEC3-R engine management
935 headers
Twin 54mm custom built turbos
23 lbs boost
water-methanol injection
Aluminum rods
Horsepower- you get the idea!

[jwasbury]

[QUOTE=kenikh;8232427]

• 98mm 8.5:1 JEs, ceramic coated
  

8.5:1 CR on CIS seems pretty aggressive. Normally the territory of EFI builds IME. What boost level are you planning to run?

[kenikh]

[QUOTE=jwasbury;8232999]

Originally Posted by kenikh

• 98mm 8.5:1 JEs, ceramic coated
  

8.5:1 CR on CIS seems pretty aggressive. Normally the territory of EFI builds IME. What boost level are you planning to run?

.8 BAR for the time being. Cams will help since off idle dynamic compression is lower than sc and stock cams. Twin plugs are there to help, as well. This is a known configuration that has successfully run 1 BAR with perfect AFRs.

[TurboKraft]

Originally Posted by kenikh

Currently going together:

• 98mm 8.5:1 JEs, ceramic coated
• Stock ports
• Twin plugged heads and dizzy
• Leask WUR
• Euro ('79) fuel head
• Euro heat exchangers
• K27-7006
• Zork Tube
• Andial Intercooler
• DC15 (Sport SC) cams

Any guesses on where this ends up power wise?

Why all the compression and SC cams but stock 32mm intake ports?

[kenikh]

Originally Posted by TurboKraft

Why all the compression and SC cams but stock 32mm intake ports?

Rationale was to maintain intake port velocity for off the line torque. Heads are still at Ollie's - I can still tell them to open them up.

From your post, it sounds like you are recommending that I should.

[TurboKraft]

I would if it was my car.

I know there is the rationale that small ports = higher port velocities, and thus better low speed drivability, and if you choose follow this, no problem. You're entitled to your opinion.

My $0.02:
I used to adhere to this as well. If Ruf and Andial did 36mm ports, then that has to be best, right?
But the more we ported heads, the better and better the cars got. More punch. More torque. More HP. More drivable.
Now 36mm is our minimum size (most you can bore stock plastic injector blocks) and most of our CIS engines are 38-40mm (40mm is ID of stock CIS gasket).

Heck, when SC and Carrera heads were plentiful, a lot of builders used to slap them on 3.3L Turbo engines. A 3.3L with 41.5mm 3.2L heads is by no means a lazy engine off the line.

[kenikh]

I defer to your expertise. I'll call Ollies and tell them to add porting to the bill. Question then becomes: What's a set of aluminum injector blocks from TurboKraft run if I go with >36mm ports? Do you port the exhausts to the same spec?

Originally Posted by TurboKraft

I would if it was my car.

I know there is the rationale that small ports = higher port velocities, and thus better low speed drivability, and if you choose follow this, no problem. You're entitled to your opinion.

My $0.02:
I used to adhere to this as well. If Ruf and Andial did 36mm ports, then that has to be best, right?
But the more we ported heads, the better and better the cars got. More punch. More torque. More HP. More drivable.
Now 36mm is our minimum size (most you can bore stock plastic injector blocks) and most of our CIS engines are 38-40mm (40mm is ID of stock CIS gasket).

Heck, when SC and Carrera heads were plentiful, a lot of builders used to slap them on 3.3L Turbo engines. A 3.3L with 41.5mm 3.2L heads is by no means a lazy engine off the line.

[JFairman]

I opened up my intake ports to 40mm to match them to the 40mm aluminum CIS injector blocks I have. Also opened up the holes in the flat manifold to 40mm and smoothed out the internal edges around them leading into the inside of the manifold best I could.
There's no flat spots or shortage of off the line and around town torque below 3000 rpm, none at all!
Try it you'll like it

[TurboKraft]

Originally Posted by kenikh

I defer to your expertise. I'll call Ollies and tell them to add porting to the bill. Question then becomes: What's a set of aluminum injector blocks from TurboKraft run if I go with >36mm ports? Do you port the exhausts to the same spec?

CIS Injector Blocks = $495 with insulators, gaskets, injector sealing rings. Any bore size you want, straight or tapered.

If you have a gasket set, you'll only need the blocks & insulators, $470.

Exhaust ports -- I'd open them, too.
At some point you're limited to the ID of your exhaust manifolds. What is the OD of your manifolds' primary pipes?

[kenikh]

Originally Posted by TurboKraft

What is the OD of your manifolds' primary pipes?

Factory Euro HEs

[SCHNELE]

I would!

[kenikh]

Exhaust port specs given euro HEs? 38mm or ?

[kenikh]

Originally Posted by TurboKraft

CIS Injector Blocks = $495 with insulators, gaskets, injector sealing rings. Any bore size you want, straight or tapered.

If you have a gasket set, you'll only need the blocks & insulators, $470.

Exhaust ports -- I'd open them, too.
At some point you're limited to the ID of your exhaust manifolds. What is the OD of your manifolds' primary pipes?

You guys let the tempest out of the teapot, so I need some input. Machine shop has the heads ready to go onto the porting bench.

I know no one wants to be on the hook for me making a decision, but unless someone has a reason to go another direction, I am leaning to 38I/38E, given I am currently running Euro HEs.

Again - input appreciated and I promise I'll post a dyno pull once all is said and done to repent for diverting this thread.

[Tippy]

My car is a Carrera and has far more low end torque than a friends 965 with CIS.

I can even chirp the tires now (new 285's) by popping the throttle in first at idle speeds with my G50. I made a recent change to my EFI and discovered this.

It's really torquey, and I think Carrera are 41mm ports??

Another words, do it!!

[empire0007]

https://www.youtube.com/watch?v=3W9nPlRqNo8

Originally Posted by empire0007

https://www.youtube.com/watch?v=3W9nPlRqNo8

[empire0007]

I have heard that anything over 550WHP for aircooler engine will damage the motor, unless you have the flat fan, like the 935 engine? Do any of you guys run that kind of power on track? If so how much power and how long has the engine lasted? The head is the issue from my understanding?