2003 Porsche 996 C4S, LS3 Conversion
09-27-2016, 04:21 PM
#401
With the front drive disconnected, you also have the added benefit of being able to switch out the shock uprights. The turbo uprights are offset to accommodate the driveshafts while the GT2 (RWD turbo) or GT3 (RWD nonturbo) had more 'proper' uprights which go straight up. The difference in suspension geometry and 'feel' is substantial, with the proper uprights having a much more natural and intuitive feel on road and track.
Having driven a 996 GT2 vs my 996TT back to back, this is the first and most prominent difference I noticed between the two. Bump steer especially is terrible on the TT due to the uprights/geometry.
Just something to think about if you want to throw some more money at it.
Having driven a 996 GT2 vs my 996TT back to back, this is the first and most prominent difference I noticed between the two. Bump steer especially is terrible on the TT due to the uprights/geometry.
Just something to think about if you want to throw some more money at it.
09-28-2016, 03:10 PM
#402
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My ls3 swap Micheal,
Your car looks awesome. I completed a 1999 C2 several months ago and here are a few photos of my toy!
Regards,
John Newcomb
Your car looks awesome. I completed a 1999 C2 several months ago and here are a few photos of my toy!
Regards,
John Newcomb
Last edited by johnnewcomb62; 10-14-2016 at 08:06 AM.
09-28-2016, 05:01 PM
#403
Is that center radiator and ducting stock? I thought the NA cars didn't have a center radiator and that duct looks like something I'd expect on a GT2 which has vents just in front of the hood. Could be wrong on both counts as I've got no experience with the NA cars but own a tt model. Slats on the lower rear bumper on turbo cars are to draw air through intercoolers not for any engine cooling effect. Are you certain all of the air is out of the cooling system, these cars are tough to bleed!
09-28-2016, 06:52 PM
#404
John, Are you using the Porsche computer to control your cooling fans? I installed the Porsche water temp sensor in the drivers side head and using the Porsche ECU to control the cooling fans, I'm using the GM ECU fan to control the water pump if I remember right, Mine has never got above 210 or so in 100 degree Louisiana temps with air on. The only downside I've seen on mine is during cold weather it'll get up to 180 and drop to like 150 as soon as thermostat opens and takes awhile to stabilize at around 200
09-28-2016, 07:53 PM
#405
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The center radiator is of stock configuration. It was order for a automatic car. Mine is a 6spd of course but got the radiator duct and hoses from some aftermarket place and installed.
Last edited by johnnewcomb62; 10-14-2016 at 08:07 AM.
09-29-2016, 07:45 PM
#407
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Nah the fans are supposed to come on low but with the 1999 system I couldn't figure out how to get the Porsche ac control unit to fire the ac relay because it was hooked in with the firing of the cylinders somehow in order to limit the ac in case of sudden demand in power so that it would drop the ac relay out. I just found a constant hot and ran it to a switch and hooked it to the firing side of the ac relay and when I want ac I just flip on the switch and cool happens!
Again your car is awesome wasn't trying to hijack your ad just trying to ad a little sorry. Best of luck with it as well maybe we'll see ya'll at a car show sometime we get around to a few and I have kin folks down your way.
John
Again your car is awesome wasn't trying to hijack your ad just trying to ad a little sorry. Best of luck with it as well maybe we'll see ya'll at a car show sometime we get around to a few and I have kin folks down your way.
John
Last edited by johnnewcomb62; 10-14-2016 at 08:11 AM.
12-10-2016, 12:46 PM
#408
Thought I'd post a link to my Photo Bucket Page for those that would like to see some more photo's that may have not been posted in thread
http://s922.photobucket.com/user/fierofly88/library/
http://s922.photobucket.com/user/fierofly88/library/
Last edited by Fierofly; 12-10-2016 at 01:08 PM.
12-10-2016, 01:00 PM
#409
Ac relay Nah the fans are supposed to come on low but with the 1999 system I couldn't figure out how to get the Porsche ac control unit to fire the ac relay because it was hooked in with the firing of the cylinders somehow in order to limit the ac in case of sudden demand in power so that it would drop the ac relay out. I just found a constant hot and ran it to a switch and hooked it to the firing side of the ac relay and when I want ac I just flip on the switch and cool happens!
Again your car is awesome wasn't trying to hijack your ad just trying to ad a little sorry. Best of luck with it as well maybe we'll see ya'll at a car show sometime we get around to a few and I have kin folks down your way.
John
Again your car is awesome wasn't trying to hijack your ad just trying to ad a little sorry. Best of luck with it as well maybe we'll see ya'll at a car show sometime we get around to a few and I have kin folks down your way.
John
12-11-2016, 03:10 PM
#410
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Fierofly - do you know what the 2 small wires (1 is Purple, 1 is yellow/white) are for? They're connected to the small electronics box held above the fuel pump. I figured out to connect the larger gauge green wires (power) and larger gauge brown wires (ground) to bypass the electronics box so that the fuel pump can be solely controlled by the LS3.
*My Bently manual seems to be missing some items that are specific to a 4S.
here's the picture from your own build:
BTW - HUGE thanks for documenting so much of your build, mine is very similar and it's been a big help!!!
*My Bently manual seems to be missing some items that are specific to a 4S.
here's the picture from your own build:
BTW - HUGE thanks for documenting so much of your build, mine is very similar and it's been a big help!!!
12-11-2016, 03:38 PM
#411
Fierofly - do you know what the 2 small wires (1 is Purple, 1 is yellow/white) are for? They're connected to the small electronics box held above the fuel pump. I figured out to connect the larger gauge green wires (power) and larger gauge brown wires (ground) to bypass the electronics box so that the fuel pump can be solely controlled by the LS3.
*My Bently manual seems to be missing some items that are specific to a 4S.
here's the picture from your own build:
BTW - HUGE thanks for documenting so much of your build, mine is very similar and it's been a big help!!!
*My Bently manual seems to be missing some items that are specific to a 4S.
here's the picture from your own build:
BTW - HUGE thanks for documenting so much of your build, mine is very similar and it's been a big help!!!
12-11-2016, 10:51 PM
#412
If you desire a drop in fuel system speak to Sean at Silly Rabbit Motorsports, tell him I sent you. Single Walbro, dual (I have this), or PWM brushless are available. He's done these all for TT cars but I suspect the module may drop in. As this is an AWD car you've likely got the funky tank with siphon hoses in the bottom and a fuel module up top like an upside down U. He may have those plastic hoses if you've got any broken.
12-21-2016, 06:55 PM
#413
Michael, couple questions on your build that I am needing help and direction for my 997 project.
1. What size AN fittings and lines were used on the RH power steering kit?
2. How did you run your AC lines to the compressor? I have cut mine under the axle on the passanger side and thinking of running inside the tunnel area where the trans is. Also what size AC lines did you go with? #8 and #10 is what I have planned
3. What did you do with your EVAP line that runs to the charcoal canister and up to filler neck?
1. What size AN fittings and lines were used on the RH power steering kit?
2. How did you run your AC lines to the compressor? I have cut mine under the axle on the passanger side and thinking of running inside the tunnel area where the trans is. Also what size AC lines did you go with? #8 and #10 is what I have planned
3. What did you do with your EVAP line that runs to the charcoal canister and up to filler neck?
12-21-2016, 07:36 PM
#414
Michael, couple questions on your build that I am needing help and direction for my 997 project.
1. What size AN fittings and lines were used on the RH power steering kit?
2. How did you run your AC lines to the compressor? I have cut mine under the axle on the passanger side and thinking of running inside the tunnel area where the trans is. Also what size AC lines did you go with? #8 and #10 is what I have planned
3. What did you do with your EVAP line that runs to the charcoal canister and up to filler neck?
1. What size AN fittings and lines were used on the RH power steering kit?
2. How did you run your AC lines to the compressor? I have cut mine under the axle on the passanger side and thinking of running inside the tunnel area where the trans is. Also what size AC lines did you go with? #8 and #10 is what I have planned
3. What did you do with your EVAP line that runs to the charcoal canister and up to filler neck?
12-21-2016, 08:02 PM
#415
Thanks, I don't have my adapter yet so can't put my engine and trans in to see how much space is available. Hard to say for sure but does look to have decent amount of space above the trans. Seen your pics on post #343 and didn't cut mine that close to the factory disconnects and probably about 10" further up towards the axle. Nothing welded yet and can always cut more once I am sure how to route.
02-15-2017, 07:33 PM
#418
Making progress on my build and reaching the point that I need to buy an alternator. What AMP alt are you running? Doing some research and finding 997's run 150amp while standard LS alt's are 110amp. Got my eye on a couple LS HD series alternators that are 130-145amp but figured I would ask if anyone experienced charging or battery drain issues with their swaps.
02-15-2017, 07:59 PM
#419
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Making progress on my build and reaching the point that I need to buy an alternator. What AMP alt are you running? Doing some research and finding 997's run 150amp while standard LS alt's are 110amp. Got my eye on a couple LS HD series alternators that are 130-145amp but figured I would ask if anyone experienced charging or battery drain issues with their swaps.
(It has an 8-digit GM part number)
