How much boost on 91?

911st · 12-30-2009, 09:45 PM

How much boost are you guys running on Calif. gas?

Also, what is a 944T's compression?

Thx.

PAUERMAN · 12-31-2009, 09:34 PM

I just had a dyno session last week on a DynaPack machine and I was able to boost to a peak of 19 psi without any detonation using the same crap 91 pump that you use in Cali.

I tuned my car with a standalone system and listened to my knock controller with headphones. Surprisingly, with the "correct" timing value(s) the car ran great and put down 358 whp and 352 lb/ft at an average of 18.5 psi.

Static compression is 8:1

911st · 01-01-2010, 08:07 AM

I come from the 930 community so that is an impressive amount of boost on top of 8/1 CR.

chip18 · 01-01-2010, 01:37 PM

18 psi on 91 with MAX 951 chip, 55 lbs injectors 2.5 test pipe,3 bar regulator and Lindsey Dual port waste gate.

911st · 08:35 PM

Thx for the input.

Any idea how much timing is run at these boost levels?

chip18 · 01-02-2010, 08:54 PM

Nope, I run Max 951 chip no piggy back so I can't adjust timing don't know what the chip has it at but it's safe. I know you have to becareful with the timing in the 2000 to 3000 rpm range. I think their is a graph of the Timing in Rouge_Ants tune pro walk through.

If you run E-85 (105 octane you can run more timing) I am still on pump gas

chip18 · 01-02-2010, 08:55 PM

Nope, I run Max 951 chip no piggy back so I can't adjust timing don't know what the chip has it at but it's safe. I know you have to becareful with the timing in the 2000 to 3000 rpm range. I think their is a graph of the Timing in Rouge_Ants tune pro walk through.

If you run E-85 (105 octane you can run more timing) I am still on pump gas

Rogue_Ant · 01-03-2010, 02:36 PM

The 951 does not have different timing values for different boost pressures (unless you are running the new VR software)...
From what I've seen, the 951Max stuff, runs a bit more timing then factory.

-Rogue

911st · 01-03-2010, 02:42 PM

Dose anyone have an idea what timing on boost is about or have a timing map?

I know timing is pulled back on Motronic systems pretty aggressively with heat but I think it is measured at the AFM.

Any idea what AFR's you guys are running with all this boost? In the low 12's, 11's, or even 10's?

Rogue_Ant · 01-03-2010, 03:08 PM

Yes, check my thread here:

Click Me

W/ stock software, in boost, timing is unaffected by air intake temps.

-Rogue

911st · 06:01 PM

Rogue,

I love the MAP conversion!

I could not fine any timing info.

Do you know how much advance you guys are getting on boost?

930's are in the -16 to -19 range. Some are pushing it a bit more but they usually stay at 1 bar w 7/1 compression.

Rogue_Ant · 01-03-2010, 04:10 PM

Pretty much stock timing:

911st · 06:10 PM

Rogue,

Excellent info on the ignition.

Are you saying the 944T Motronics dose not adjust timing with changes in air temps just on WOT?

Or are you saying it dose not adjust timing with AFM air temp at all?

I know the 3.2 911 Carrera dose adjust timing. Also the 91-94 C turbos move timing up and down 3 deg with temps.

Again, thank you for the ignition maps.

On the 944T there seems to be everything to run a MAP conversion if the AFM is replaced w a MAP and temp sensor. After that it could potently be as software thing.

Protomotove converts 3.2 Carrera and later Motronics to Pressure Sensing which requires modification for a TPS and MAP sensor. It would seem it would be easyer on a 944T that already has such inputs.

Rogue_Ant · 01-03-2010, 06:55 PM

Quote:

Originally Posted by 911st

Rogue,

Excellent info on the ignition.

Are you saying the 944T Motronics dose not adjust timing with changes in air temps just on WOT?

Or are you saying it dose not adjust timing with AFM air temp at all?

I know the 3.2 911 Carrera dose adjust timing. Also the 91-94 C turbos move timing up and down 3 deg with temps.

It does not adjust of of Air Intake Temps (AIT), but it does adjust using coolant temps. Since the early 911 Turbos did not have coolant, so they used AIT.

Quote:

Originally Posted by 911st

Again, thank you for the ignition maps.

NP

Quote:

Originally Posted by 911st

On the 944T there seems to be everything to run a MAP conversion if the AFM is replaced w a MAP and temp sensor. After that it could potently be as software thing.

Protomotove converts 3.2 Carrera and later Motronics to Pressure Sensing which requires modification for a TPS and MAP sensor. It would seem it would be easyer on a 944T that already has such inputs.

Yes the potential is there, however, significant software changes would need to be made. Furthermore, a true TPS signal would need to be worked out, since the 944 does not receive actual TPS angle.

911st · 01-03-2010, 07:53 PM

My mistake, I thought the 944T had a real TPS. The Carrera just has a WOT and Idle switch that looks like a TPS.

The conversion I note requires a mod to the Motronics board.

Again, thanks.

Rogue_Ant · 01-03-2010, 07:58 PM

The 944T does have a real TPS, w/ idle switch. However the KLR receives TPS angle, not the DME... So regardless, some changes would need to be made.

911st · 01-03-2010, 08:07 PM

Makes sense.

Do you know the temp (coolant) correction factor or range.

Is it about +/- 3 deg.

Thx again.

Rogue_Ant · 01-03-2010, 08:39 PM

I would have to look at my notes - but IIRC, -3 max as coolant temp rises...

911st · 01-03-2010, 09:01 PM

All is appreciated.

Thx!

Rogue_Ant · 01-03-2010, 09:14 PM

No problem