Twin Turbo LS1 1993 RX7 Build
08-19-2009, 10:28 AM
#1
Twin Turbo LS1 1993 RX7 Build Hey all,
This is a a build I'm working on for/with a friend (The Beast here on 'Tech).
370" Iron block, Diamond forged boost pistons, compstar rods, eagle crank, lingenfelter heads and JPH cam. Built T56, McLeod twin disk clutch and Mustang Cobra 8.8 IRS rear.
Here are a few pics of the progress so far; the turbos are twin precision 60 mm units:
The piping is schedule 10 stainless 2.5" for the feeds, with 3" outlets from each turbo merging into a 4" downpipe. The 4" downpipe will eventually neck down to 3.5" with a bullet muffler and dump under the car.
Comments?
This is a a build I'm working on for/with a friend (The Beast here on 'Tech).
370" Iron block, Diamond forged boost pistons, compstar rods, eagle crank, lingenfelter heads and JPH cam. Built T56, McLeod twin disk clutch and Mustang Cobra 8.8 IRS rear.
Here are a few pics of the progress so far; the turbos are twin precision 60 mm units:
The piping is schedule 10 stainless 2.5" for the feeds, with 3" outlets from each turbo merging into a 4" downpipe. The 4" downpipe will eventually neck down to 3.5" with a bullet muffler and dump under the car.
Comments?
What are you shooting for? Keep us posted. 
08-19-2009, 11:31 AM
#5
His goal is 1000.1 RWHP on race gas/meth just for a Supra style dyno queen session. Normal tune/setup will be around ~750 RWHP pump gas + methanol. The setup should be good for it, though the devil is in the details, so we'll have to see.
Fueling is twin Supra Denso fuel pumps, modified for higher flow/voltage, in tank, with -10 feed to Summit fuel rails to regulator -8 return. Injectors are (I think) 80 lbs units (90 lbs at 58 psi) and the fuel system will be boost referenced. Control will be a 99+ PCM w/ custom OS. Probably be taking it up to Speed, Inc. for tuning once it's broken in, I will do the base tune myself.
Here are a couple of earlier pics:
Interior:
Body is rough right now, but is straight and rust free. Will be getting a new paint job once the drivetrain is complete and sorted. Until then, it's pink (etching primer).
Engine:
Fueling is twin Supra Denso fuel pumps, modified for higher flow/voltage, in tank, with -10 feed to Summit fuel rails to regulator -8 return. Injectors are (I think) 80 lbs units (90 lbs at 58 psi) and the fuel system will be boost referenced. Control will be a 99+ PCM w/ custom OS. Probably be taking it up to Speed, Inc. for tuning once it's broken in, I will do the base tune myself.
Here are a couple of earlier pics:
Interior:
Body is rough right now, but is straight and rust free. Will be getting a new paint job once the drivetrain is complete and sorted. Until then, it's pink (etching primer).
Engine:
Last edited by digitalsolo; 08-19-2009 at 11:37 AM.
08-19-2009, 11:39 AM
#6
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(Mazda chassis + Ford 8.8 IRS) Twin 60mm's) + 370 LS1 = a muthin fu(kin' problem!!! that thing is going to be a beast! Are you (or your friend) going to stick it out with a T56?
08-19-2009, 11:50 AM
#7
He's planning on keeping the T56, yes. This isn't a max effort drag car, just a fun street car to play with, so the T56 is the more entertaining (if lower performing) option.
FWIW, I run a T56 in my turbo LS1/RX7 also. Sucks at the track, but it's a lot of fun to drive. Both cars will eventually get Lingenfelter 2 step systems.
FWIW, I run a T56 in my turbo LS1/RX7 also. Sucks at the track, but it's a lot of fun to drive. Both cars will eventually get Lingenfelter 2 step systems.
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08-19-2009, 12:09 PM
#10
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Thanks for the kind words guys
I've got to give a HUGE thanks to Mr. Digitalsolo for all of his time, effort, knowledge, and skill! The swap and the turbo kit wouldn't have been possible with out him
And also for him putting up with me
I've got to give a HUGE thanks to Mr. Digitalsolo for all of his time, effort, knowledge, and skill! The swap and the turbo kit wouldn't have been possible with out him
And also for him putting up with me
08-19-2009, 12:45 PM
#11
Between 100 and 120 lbs depending on whom you ask.
This car will probably be around 52.5-53% front weight distribution due to the iron block + turbos and plumbing. Total vehicle weight likely in the 3000-3100 lbs range (it shouldn't exceed 3100 lbs).
Thanks for the props Nick. It's fun working on the car, plus I get fed well over at your place.
This car will probably be around 52.5-53% front weight distribution due to the iron block + turbos and plumbing. Total vehicle weight likely in the 3000-3100 lbs range (it shouldn't exceed 3100 lbs).
Thanks for the props Nick. It's fun working on the car, plus I get fed well over at your place.
08-19-2009, 12:50 PM
#13
I wish I would''ve pulled the trigger on an LS swap in my FD. Good for you guys!
I took the money and put it in my 10,000 lb. GTO instead.
I'm curious about welding the SS to Iron manifolds. I did'nt even know that was possible. How are you welding it and what filler material are you using?
Great job on the build
I took the money and put it in my 10,000 lb. GTO instead.
I'm curious about welding the SS to Iron manifolds. I did'nt even know that was possible. How are you welding it and what filler material are you using?
Great job on the build
08-19-2009, 01:12 PM
#15
I wish I would''ve pulled the trigger on an LS swap in my FD. Good for you guys!
I took the money and put it in my 10,000 lb. GTO instead.
I'm curious about welding the SS to Iron manifolds. I did'nt even know that was possible. How are you welding it and what filler material are you using?
Great job on the build
I took the money and put it in my 10,000 lb. GTO instead.
I'm curious about welding the SS to Iron manifolds. I did'nt even know that was possible. How are you welding it and what filler material are you using?
Great job on the build
The passenger manifold is C6, and uses a flange to connect to the turbo system. I don't know what alloy GM uses, but it gets ugly with heat. If you look at the second picture from the bottom, you can see the weld between the halves of the manifold, and where we ground off GM's weld where the AIR pipe used to be. Last edited by digitalsolo; 08-19-2009 at 01:20 PM.
08-19-2009, 01:53 PM
#16
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There is 76 mm (3") of wastegate open to atmosphere, I really don't think the angle of attack of the piping is going to matter too much on it. My angle on my single 48 mm kept me at 7 lbs without issue, and it was no better than that. We shall see how it goes though. The car will be running 10 psi on the base, and there really just isn't anywhere better to put them due to all the other things that must still fit in there. I realize you should be familiar with the wastegates though.
That isn't a cast iron manifold, that's a dual wall SS '98 F-Body manifold. The passenger manifold is C6, and uses a flange to connect to the turbo system. I don't know what alloy GM uses, but it gets ugly with heat. If you look at the second picture from the bottom, you can see the weld between the halves of the manifold, and where we ground off GM's weld where the AIR pipe used to be.
That isn't a cast iron manifold, that's a dual wall SS '98 F-Body manifold.
The passenger manifold is C6, and uses a flange to connect to the turbo system. I don't know what alloy GM uses, but it gets ugly with heat. If you look at the second picture from the bottom, you can see the weld between the halves of the manifold, and where we ground off GM's weld where the AIR pipe used to be.
08-19-2009, 01:58 PM
#17
Thanks. The hot side should be TIG'd next week and coated soon after that. The cold side is intentionally very simple (and short), and will feed a 2 into 1 I/C with a Vette style center feed to the T/B.
Hopefully all works as well as it should on paper; I really do think the gates will be okay, but if all else fails, well make a few adjustments.
Hopefully all works as well as it should on paper; I really do think the gates will be okay, but if all else fails, well make a few adjustments.
