928 Pro Tour LS3 / Z06 Build
11-28-2017, 02:05 AM
#241
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This has to be one of my favorite threads in a long time, and at the same time the most frustrating. I'm sorting through photos watching you guys accomplish more in a few weeks than I did all year on my cars. Well done!
......why not sell the perfectly good non-exploded engine to fund the conversion?
Considering 300k+ miles on properly maintained S4's, your plan might take a while
......why not sell the perfectly good non-exploded engine to fund the conversion?
Considering 300k+ miles on properly maintained S4's, your plan might take a while
11-28-2017, 01:34 PM
#243
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Fuse 24 Assassin
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Fuse 24 Assassin
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Curious to know if he is going to do the 'hot cam' later which bumps the power up even more on the LS3. It's not like CA is going to know it's in there. These engines are pretty clean even with cam mods.
11-28-2017, 08:55 PM
#245
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Appreciate your view and positive words.
Porsche was ahead of there time with the 928. Pretty amazing they used aluminum panels in the body and used a torque tube drive train almost 40 years ago.
If you are a 928 owner and drive your car on a regular basis, the same complaints come up about the manual transmission, timing belt / water pump / oil leaks and the infamous electrical system. I like the classic lines of the 928 and to think you can take modern reliable “better” components and convert into a 928 is The best of both worlds. It is no different than Singer making a $400,000 car out of a 964.....there is nothing original about the car, but it is a work of art.
Porsche was ahead of there time with the 928. Pretty amazing they used aluminum panels in the body and used a torque tube drive train almost 40 years ago.
If you are a 928 owner and drive your car on a regular basis, the same complaints come up about the manual transmission, timing belt / water pump / oil leaks and the infamous electrical system. I like the classic lines of the 928 and to think you can take modern reliable “better” components and convert into a 928 is The best of both worlds. It is no different than Singer making a $400,000 car out of a 964.....there is nothing original about the car, but it is a work of art.
back to you 
I probably should mention my interests in this thread aren't purely vicarious (but I am a great lover of good car ****). I own a 1985 parts car I've been using for years as a donor for my '85 street machine and I'm reaching a point where I'll need to decide to either tear it down to the nuts and bolts or convert it to a track rod. It has a very fine working block in it that will need a complete rebuild just because all the plastic parts on it have crumbled away and none of the sensors or harnesses are any good, but the engine itself is strong. I could rebuild it (which would be a good experience for me) or do something like what you're doing. Mine (like most) is an auto, so converting it to a manual would be an additional challenge, but then there's always the option of mating the LS3 to a suitable automatic I suppose. Mind you, the interior is gone so I can take quite a few liberties with the chassis if I decided to just go manual, and I'd very much prefer that in a track machine.
So I'll be watching your project with great interest. Thanks for going to all the trouble of documenting it, you've done an excellent job so far!
Best regards,
11-28-2017, 09:02 PM
#246
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Further, if I pull the engine, torque tube and transmission from my parts car and re-build them, I have spares for my street car. Your project is looking more and more attractive...
11-29-2017, 10:04 PM
#248
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Scott, I have been "crazy thinking" in the mode of your parts car (I have access to one like it, but probably will pass) and thought to follow in Fixer's path by stripping everything possible to lose the weight and might go with the LT (direct injection) version of GM's 4.3 V6 in front of a C5 (or C6) 6 speed manual like Lance is doing here. That V6 puts out 300HP and weighs 360 lbs. I would think that if you stripped (dipped) the undercoating off, did all the mods on Fixer's car and lose 150+ lbs with engine you could get down around 2200 lbs. With 300HP, 4.10 axle gears and the 6 speed manual you would have a real screamer, would sound funny though...
I am sorry Lance for hijacking your thread, delete if you wish.
I am sorry Lance for hijacking your thread, delete if you wish.
11-29-2017, 10:17 PM
#249
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Scott, I have been "crazy thinking" in the mode of your parts car (I have access to one like it, but probably will pass) and thought to follow in Fixer's path by stripping everything possible to lose the weight and might go with the LT (direct injection) version of GM's 4.3 V6 in front of a C5 (or C6) 6 speed manual like Lance is doing here. That V6 puts out 300HP and weighs 360 lbs. I would think that if you stripped (dipped) the undercoating off, did all the mods on Fixer's car and lose 150+ lbs with engine you could get down around 2200 lbs. With 300HP, 4.10 axle gears and the 6 speed manual you would have a real screamer, would sound funny though...
I am sorry Lance for hijacking your thread, delete if you wish.
I am sorry Lance for hijacking your thread, delete if you wish.
11-29-2017, 10:27 PM
#250
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Oh, I thought I remembered Matt's car at 2450 or so. I am doing similar engine to Lance's and am planning on using a C7 8 speed automatic. Expect mine to be similar weight to stock or slightly heavier, with a slight rear bias. Mine is just a cruiser as opposed to Lance (and your) racier cars.
11-29-2017, 10:49 PM
#251
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Pretty sure Matt got her down to 2,670ish and was really stripped out..re: insulation removed, holes drilled in non-critical points thoughout, etc. You mentioned ^^ 2,200 lbs. That would be a feat even with the lighter LS motor. Remember your only losing 50lbs if running the Z06 trans/diff/tq tube. You'll also be adding more weight back in running a 8spd Vette Auto. IIRC Carl FLYVMO is running the slightly earlier 6 or 7 spd auto in his build. https://rennlist.com/forums/928-foru...ed-car-41.html. Just Peachy was not built to be a super lightweight"racer"...rather a comfortable/streetable/powerfull fast resto-mod. It has a full pascha interior with the exception of a rear seat delete with a big aftermarket sound system...so no weight savings there. https://rennlist.com/forums/928-foru...b-project.html T
11-29-2017, 11:51 PM
#252
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Oh, I thought I remembered Matt's car at 2450 or so. I am doing similar engine to Lance's and am planning on using a C7 8 speed automatic. Expect mine to be similar weight to stock or slightly heavier, with a slight rear bias. Mine is just a cruiser as opposed to Lance (and your) racier cars.
I was told that the C6 and C7 Torque tubes are larger in diameter to the C5 and possible would not fit inside the tunnel without major mods. It would be nice to get the diameter, so we know if it will fit. Both C6 & 7 are much better drive trains than the C5 and will take a lot more HP.
11-30-2017, 11:39 PM
#253
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"Oh, I thought I remembered Matt's car at 2450 or so. I am doing similar engine to Lance's and am planning on using a C7 8 speed automatic. Expect mine to be similar weight to stock or slightly heavier, with a slight rear bias. Mine is just a cruiser as opposed to Lance (and your) racier cars."
I've been thinking about this same combo!
The issue is finding out if the C7 A8 8l90 trans aka Gev V transmission will communicate properly with the Gen IV LS engine computer.
The C7 Corvettes did have the same A6 6L80 transmission as some of the Gen IV cars/ trucks, and then switched over to the newer A8 8L90.
So my thought is that it "should" work. GMPP sells a harness, and transmission computer for use in something like this, bu specifies that you need the Gen V engine computer to go with it.
I've contacted HP tuners to see what they can do, I will keep you posted...
I've been thinking about this same combo!
The issue is finding out if the C7 A8 8l90 trans aka Gev V transmission will communicate properly with the Gen IV LS engine computer.
The C7 Corvettes did have the same A6 6L80 transmission as some of the Gen IV cars/ trucks, and then switched over to the newer A8 8L90.
So my thought is that it "should" work. GMPP sells a harness, and transmission computer for use in something like this, bu specifies that you need the Gen V engine computer to go with it.
I've contacted HP tuners to see what they can do, I will keep you posted...
11-30-2017, 11:56 PM
#255
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lots of room to use stock cast headers or aftermarket tube headers. The SS hooker headers I purchased is for another LS3 twin turbo build (sand car). I put them on the LS3 motor for the 928 and installed. Had room to spare in the engine compartment. I am on the fence if I am going to use them on the 928 build.