Hey guys, I built a Supercharger setup for my 944 - 7 years ago and now it's just been installed on my brothers 85.2. The car uses an Eaton blower running approx. 6 lbs of boost and utilizes the RogueTuning NA-Tune MAF conversion and 944 Turbo injectors. It's currently running on a stock DME that was modified by Rogue and now has a Moates Ostrich 2.0 emulator and we're running TunerPro RT.
Does anyone have a good working knowledge of the tuning program for the 944? My memory is terrible and I'm having trouble remembering how to get it to run better. It currently runs and drives but definitely needs some more tuning work. We want to get it as close as we can before taking it to a Dyno for the final tune. Thanks.

 

DarrenD,
First off: Missed you here. Its been a minute.
I only have 1 944 car of tuning under my belt. And it's running an "RPM-based" standalone tuning program (SDS efi).
However I clearly remember that the very first step was to use a timing light and set the spark ignition timing throughout the rpm range. This involved me marking the front pulley with a white pen & then using an adjustable timing light and adjusting parameters.

 

Ummm... fantastic!

 

Can you tell me what is the situation with the long breather looking hose (around 1" diameter)?

 

meter air? (Recirculation)

 

I havent messed with TunerPro/NA-tune since 2015, but could probably remember it...

pm me your config file and I'll take a look.

 

It's crankcase ventilation. I'm not sure why he chose to run it like that but it appears to be working.

Good call on the timing, I will do that.

And yes, I've been gone for a bit. I sold my 944 Turbo and bought a '99 Boxster and I LOVE IT!! I still love the 944 and my brother has 2 so I still get to platy with them. It's been fun getting this Supercharger setup running again.

 

Thanks, I'll do that.

 

Very cool work. I also have the Ostrich but haven't run the car on it yet. Have you posted on the Moates forum? There are a few 951's running it and perhaps could get you a base file that is close enough for fine tuning.

 

Because I'm running the NA-tune, it's quite a bit different than the Turbo tunes. I'm not sure why though?

I will try checking out the Moates forum though, thanks!

 

I'm struggling the most with the timing tables. There are so many different ideas when it comes to timing. Retard timing significantly at high load and maintain fueling to reduce detonation and make power or run a bit more advance but increase fueling to reduce detonation. I like the first idea better. I'm just not sure what the engine can take in terms of max advance at different loads. With a Roots type blower, it pretty much makes peak boost(6 psi) so it hits max load at a fairly low rpm. They also need a fair bit of hp just to freewheel(with bypass open) so the idle timing is different as well. Anyone running a 944 witha Roots blower on here?

 

Do you have a knock sensor?

 

havent had a chance to dig in yet but fwiw, IMO, the major weak point of boosted 944 engines is people trying to run too much ignition timing for the poor combustion chamber design and wide spread head studs = lifting the head off the block and popping gaskets.

since your boost is more or less a fixed value, minus a little ramp up at low RPM with that blower, you need to be careful with timing at high load (which in NA tune is like the top 1/3 of the timing table range)

back in the day, when i was messing with NA-tune and dyno-ing lots of various part combos my 9.5:1 stock NA engine stopped making power past 32 degrees at WOT on 91 octane.
anything more just pinged and made a choppy graph without making any more power.

if you have time for reading head over to the 928 forum, there are a ton of supercharged 928s using essentially the same engine as you (just twice as much)!

 

the car does not have a knock sensor. it will get one eventually if this setup works well.

That is awesome info Spencer. I actually did an ign. table last night where i topped it out at 32. Crazy.
I will check out the 928 forum, i never thought of that,

 

I got some quotes a few years ago for local shops to dyno tune my speed density standalone setup, just to make sure. Averaged $500 or so (yet to actually commit and have it done). I would think that if you can guide them through the software, a competent tuner could sort this out if you guys are looking for the most ideal solution (given there is no knock event feedback).