Mother

JEZZ Tippy you're no fun, it's not what I will learn but is also what you will learn. Little grumpy today.

1999 I did blow the MAF so I stuck in my other used one and I am back at idle and reading 1.37 - 1.44 V fluctuating.

At 6200 rpm and 4.6 V seems still to high if redline is 6800 this would put me over 5V I think and maybe causing the MAF failure?

My belt is 92.5" and seems really tight, I think I only have 3/4 inch left on tensioner till maxed out. As a note the belt actually did not break but split a couple of ribs on the inside closest to the SC and shredded off.

FVD now wants my stock ECU file to mod and are going to clean up the low end stumble.

Mother

Good call redridge MAF is toast. New one in and all is ok.

1999Porsche911

I don't see how it is possible to have a 92.5 inch belt if it is connected to all accessories. Depending on SC pully size, you should have a 103 - 103.7 inch belt. Too tight and you are going to fry your bearings.

Mother

The package says 93 1/8" but I measure it at 92.5', my question is what are you doing with the extra, running a cappicino machine? I think that the tensioner sets how tight the belt is and not the size of the pulley. As long as I am not reaching the tensioner limit travel during WOT I'm ok, but at present I do not know how much it travels. Our systems are different and I imagine this accounts for belt size difference.

redridge

Mother, whose SC bracket are you using, did you make your own? how many pullies are on there?...

Mother

I modified a Ford Cobra SC bracket and just using one pulley on the sc and none on the bracket, mine pulley goes directly from the SC to the Alternator. Come to think on it my injectors are Ford Racing Bosch. Should have called it Cobra Gulf V1?

1999Porsche911

Make sure you do not have to much belt vibration. Such will cause your belt to fray and split. Best to keep free lengths of belt to a minimum.

Mother

I agree, I have only 4" between SC pulley and Alternator pulley center to center. I'll keep an eye on it. What is your take on the MAF Voltage @ WOT.

1999Porsche911

I don't think you fried it due to voltage spike unless it was going bad to begin with. What size pulley are you running?

Mother

3.3" pulley and forgot to mention that the resistor wiring was fine and checked continuity through plug which was good.

1999Porsche911

The resister you are running should be fine.
If you want, double the ohms of the resister.

Tippy

Nah, I am not grumpy, just know what could happen with a hard lean.

On the belt tension side, you could use a cable tension tool that measures force on cables and check what your belt is and what a factory 996 belt tension is. Not sure if there is enough room to get the tool in there though? Just a thought.

Too bad you cant run a cog system, there is a place called ASP who make custom pulleys. With the cog set-up, you can run lower belt tensions, I loved my set-up, zero belt slippage around the S/C pulley. Probably too impractical for the 996, but keep them in mind for other pulleys you may need, they are cheap. GL, Tippy

Mother

Sorry for the misunderstanding, I meant I was grumpy. I'll keep the cog sys in mind if I find that I am slipping, my brother used it on his blown 56 corvette with success back in the day.

1999Porsche911

You won't be pushing the compressor enough to need a cog system.

Tippy

True, I was talking about lower belt tension.

I was running a Vortech S-trim about 2-3 thousand RPM below max impeller speed (I think like 55,000RPM), thus needing the cog system.