Yes, but the weight of balans shafts was calculated in correlation to loss of weight in conrods/pistons assy? Or You just modified BS as Broadfoot Racing advertises? I am asking because I am just before reassy of my engine in 924S...

 

I purchased a pair of Broadfoot Racing shafts already modified and then asked the engine builder to fit them.

So there were no calculations in regard to any of the other engine parts

The crank / Pistons and rods have all been balanced, and I guess only having 1 counter weight on each shaft is NOT showing up any vibrations even though they spin at twice the crank speed!

It's dead smooth , which I put down to the excellent balancing, great expertise build and the liquid filled Gen Mounts...the Gearbox also uses OE Mounts the harder compound from a choice of 2 (Medium and harder)

R

 

I can;t resist answering this one months later...........

"Lets say you'll gain a few more than stock ?"

"170 crank?"


Add 35 bhp and you'll be a lot closer!

 

Oh ! I think he does know how poor they are.......!

Live mapping on a 1985 standard ECU, does anyone do this is the USA and / or other countries?

R

 

205bhp ! on a stock Bosch ECU / Dizzy / Coil & AFM !

 

I will try my build with Augtronic DME upgrade and wasted spark plug and will see has it goes. Your achievement is phenomenal! Hope to get close to Your result...

 

Ok, thanks#


There is an article in this months 911 & Porsche world where the Editors car
a 944 2.5 8v has been fitted with all of the Augments products:


- Aug ECU board
- Wasted Spark
- Augment Camshaft
- Different Injectors
- AFM delete & Different airbox etc...


The article said the power was 175bhp.


Is yours also a 2.5 8v ? and where are you based?


R

 

Curious to know if 944 from 911&PW was 150 or 160bhp version.

I don't want to be rude or trash Your topic...

If You want we can go PM...

Your spec is more displacement and more CR. You have modified cylinder head and custom exhaust system and all together fully mapped. And You yielded 205 bhp! On standard AFM/DME/coil&rotor 😈

P.S. I live in Poland. I have stroker (2,5 8V with S2 crank).

 

Not a problem, discuss away....


The 944 is a UK spec 2.5 163bhp, so +12bhp more from the quoted stock figures.


A / Automotive informed in the article that cars on their dyno (Obviously 25+ years old) are producing power in the 130's and 140's at most.


So you have the Smaller bore 2.5 block (100mm) & longer 3.0 crank and I have the larger bore 3.0 block (105mm) & shorter 2.5 crank...


Have you / are you having cylinder head work, and what camshaft..?


Do you have somebody to do a "live" mapping ?


R

 

Camshaft from JME S3-14 type. Stahl header with Dansk SS exhaust. Cylinder head fitted with inlet valves from 2,7 (48mm) and ported on CNC. Augtronic will be mapped on rolling road. Also some small P&P...

 

Ok so your displacement is 2.8 ?

Not heard of JME where are they based,

Of course left hand drive so you can get a different manifold (Stahl)

So 2.5 head machined for bigger 2.7 valves and your travelling to the UK with the car to get it Rolling roaded?

Aug Wasted spark ? AFm Delete ? Air box etc.. ?

R

 

Camshaft is from Jon Milledge Engineering.

http://jonmilledgeengineering.com/product/s3-14/

Regarding mapping I will do it locally - it seems easy with Augments interface and rolling road tuner usually tweaks a lot more powerful cars so he should handle it 😊

From Tom (Augment) I bought his DME/MAP/Wasted Spark/Wideband O2

Displacement should be around 2,8 (100,50mm and S2 crank). 1st oversize KS pistons.

Crank was knifed (drop weight), SPEC alu flywheel balanced 😊

Cylinder head was CNC machined to gain flow. Skimmed to achieve more CR.
Intake manifold was cut to clean casting markings and port&polished. Throttle body was also optimized. Intake manifold is so awkward that at the moment it was not CNC machined.

I was hoping for 185bhp, maybe 190...

But now when I read Your achievement my expectations are sky high 😉 Maybe more bore on the same stroke is better design than stroker...

Ah.. Injectors were checked, cleaned and received clean bill of health.

 

That's a fair Spec and a good amount of modifications on many parts, so for sure it will be interesting to see how it comes out against my opposite configuration.....

The Torque curves could be different and the top power achieved..

Normally I think longer stroke is more torque ?

The car is a 924S? or early / late 944 ? any weight reductions?

My Engine started the Rolling Road day with a 1st Run of 179bhp, then 8 hours later + 26bhp was found ! and also the Torque top figure matched exactly the same as the BHP.

Before this day I was also thinking of 180's maybe more, but when the first run was 179 I thought this was pretty good and a few more would be nice...

But I was shocked as the following hours included about another 12 runs...and the power kept increasing....185, 189. 192, 195, 201 I was chuffed when this came up!

And again thought that's job done...but more was to come 202, 204 & 205 !

It pulled very well on the way to the mapping session, although it felt a bit rich at some rpm's as the throttle response was a little slower to pick up crisp...

On the way back it was crispy crisp from all Rpm from 1000 to 6000

And felt even more powerful as you'd expect NOT just with an extra 26bhp
, but more so from an Optimised air & Fuel ratio in all the Rev ranges..

R

 

What is the Bosch p/n and/or what model and year Porsche is the AFM or MAF?

Thanks,
Tom

 

That photo was the intended set up with the long tube between the standard throttle body and the standard inlet manifold (modified neck + Extrude Hone)



But we couldn't get it to fit properly, so the current (and Rolling Road session) was done with the throttle body bolted directly to the Inlet manifold with angled neck and a Ramair cone foam air filter, which was boxed in with some Specific Heat sheets...


I'm not using a MAF ! but a standard 1987 924S AFM Bosch 0280202064


R