De Jeeper

Yes, no pressure or low pressure would create an "open" ground. Put some nitrogen in the system to test for leak and it will allow the compressor to turn on. 50lbs should be enough

gtxracer

System has pressure and freon, when running the compressor via ground to pin 62, air blows cold, no issues. There's continuity at pin 14 even with key off, so something isn't right. System was just charged less than 2 weeks ago.

dcdrechsel

pin 14 should always be grounded with gas in the system .no gas pin 14 open

De Jeeper

Ok by your comment i thought it was empty.

I cant even find the pressure switch ony drawings.

gtxracer

Pressure switch, if I'm not mistaken, is under the front hood, on passenger's side, under the cowl brace. I'll be out of town for a few days then I can circle back on this. Hoping it's an easy fix. Right now I'm wishing I just bit the bullet and bought a GT3....lol.

gtxracer

Need some advice on wheels and offsets.

I have a set of Fikse FM10 centers and access to new barrels and lips. I want to run the widest tire I can in the back and a decently wide tire up front. This car needs traction, badly, with all this torque from the LS1.

Something like a 305/35 out back and 245/40 up front. would like a ~26” diameter for the rear as a I could use taller gearing and a taller tire will help. 12” wide or more.

From my research, and available barrels, here’s what I come up with for the Fikse specs. Could I go wider and kore aggressive, especially in the rear? Could I run a 2” or even a 2.5” lip? I think going to a 12” wide rear wheel would open up more tire options.

Front: 18x9 +50 (1” lip / 8” barrel)

Rear: 18x11 +63 (1.5” lip / 9.5” barrel)

Thoughts? Bad idea? I don’t mind trimming. Jason has been an excellent resource and I want to maximize my contact patch so I used his e88 offsets as a starting point. Thanks!!

c didy

You should look at Hbdunn. He has 315 on 12s in the back on a narrow body. Not sure his offsets.

gtxracer

Thanks! I looked into his wheels and couldn't find a backspacing.

I did see a 996 with 335/30R18 out back in person at The Shop in Seattle. It was a Turbo car, but might be able to squeeze this under my C2 with trimming and fender rolling.

After going back and forth with Phil at VR wheels, this is what I think I'm going with. If anyone sees an issue with this width and offset, please let me know! I plan to order the barrels and lips by next week.

18x9 +50 (1" Lip and 8" Barrel)
18x12 +50 (2.5" Lip and 9.5" Barrel)

I used this thread as a reference. These are 997 NB fitment specs, but I think it's very close to 996, correct me if I'm wrong!
https://rennlist.com/forums/997-foru...-fitments.html

c didy

As I remember HB told me he was running 68 offset with a 10 mm spacer for Effective offset 58. He said there was minor rubbing at the liner. Three degrees camber.

gtxracer

Ahh thank you! I don't mind trimming the liner. I think I'll be fine at ET 50 after seeing someone running ET45 Turbo wheels on a 996 C2. Just need to confirm the width isn't a problem, but I doubt it as seeing there's guys running more positive offset with a 12x18 and 315/30.

gtxracer

Still trying to figure this out - the pressure switch gives me 1.24v with ignition on. Ignition off, it jumps to 4v then slowly creeps down to 0. Unplugging the connector to the switch gives the same 1.24v from pin 14. Very odd.

The other thing that is a concern is the PWM signal from snowflake is making the 996 AC compressor relay trigger on and off over and over. Eventually this relay will die, and being that its under my subwoofer box, I don't want to have to replace it often. I'm looking into a 12v PWM converter to 12v analog.

c didy

I don't want to lead you astray but it looks like Apex recommends 65 to 68 ET for 12-in wheel and looking at my current setup I think they might be right. Not saying 50 won't work but it might be a stretch in more ways than one, especially if you're putting a big tire on it. Thought you might want to be aware. Let us know what you do.

gtxracer

I saw that! No worries. I actually used their setup as a baseline. After researching, 50 ET is the minimum you can use without rolling fenders when using beefy tires. For my setup I’m looking at 315/30 and 335/30 rears only at this point and others have run a similar offset (45-50 ET) with the same tires without issue. Some have even ran a 30 ET and rolled fenders, but had some rubbing.

The link above from the 997 forum had a lot of good info and actual numbers with feedback. Unfortunately, there’s just a lot of Rennlisters regurgitating old/bad information and it’s misleading. Most people run a ET 63 due to availability and a slightly tucked look with less camber. I plan to increase camber anyway, so I went with ET50.

De Jeeper

None of this should be that hard. I wish i had some more time to spend on this. Maybe u could find an analog hvac controler and it will be easier to set up?

dcdrechsel

Doesn't the terminator have provisions for a pwm signal and ac compressor output ? A simple pwm conversion will also work :diode 3k resistor 2uf capacitor to ground .Pick the signal off the resistor capacitor junction point .