Twin Supercharged Miata Build (56K Beware)
08-20-2008, 05:18 AM
#121
1.5 BAR
Join Date: Oct 2005
Posts: 1,490
Re: Twin Supercharged Miata Build (56K Beware)
any progress so if the twin SUPER CHARGER idea is gay and you dont like it you can just put a turbo on the exhaust side of the cylinder head and and boost the supercharger on the intake side 
08-27-2008, 09:58 PM
#128
0.0 BAR
Thread Starter
Join Date: Apr 2008
Posts: 0
Re: Twin Supercharged Miata Build (56K Beware)
Update: I didn't finish. I got a lot done, got hung up on building the intake manifold, and stopped building SC hardware. The intake manifold runners I fabbed are 1/2" too short. They hit the fuel rail when mated against the flange. I need to order some 2" pipes and try again. Also gotta order a bunch of fittings to plumb the oil lines. Local place swore they had everything I'd need to do it. They didn't. Wasted a lot of time with them trying to make something work and ultimately failed.
Ok, that puts me 1 week before I had to go back to school. I stopped and bolted the stock I.M. back on and focused on other things. First priority was to get it running. Well the cars' stock wiring sucked. I had MS2E running parallel with the stock ECU and stock fuel and ignition system but that was a joke and a wiring nightmare. Had a million ------- black wires under the dash with tape and a number on them. Sucked. So I made a new standalone wiring harness to run the engine and its' peripherals. New harness consist of a 12' long DB37 cable that plugs into the MS2. It runs under the car below the passengers side seat and forward through the transmission tunnel and into the engine bay. I added 5 fused switched relays for MS to control the fans, LC-1 wide band, ignition system, fuel injectors, and something else. Took 2 days to build the wiring harness and install it. Surprisingly everything worked from the get go. Turned the key and it cranked and idled and everything worked. I never had to change the first wire (proof-god answers prayers). Running low ohm RC 550's right now at 62PSI fuel pressure. Also running EDIS4 with a triggerwheel setup I built. So it ran, but I had no exhaust.
So with like 5 days left before I had to go to college I took a day off and went and bought me a new motor for my car. has 82K miles on it for 88 after tax at the local pick and pull. Complete longblock with header and fuel rail. Got it sitting on an engine stand right now 'just incase'. It's also has a stronger bottom end (main bearing support plate) and lower compression than my miata engine. But my head is better so I'd only use the shortblock.
Ok back to car: Well I needed the header to build my exhaust system. My car came with a cast iron mani/pre cat stock. New header is 4 tiny pipes into a 3" collector that tapered to like a 2". I cut it where it's 3" and started running my exhaust. The exhaust snakes down under the car where it goes through 3 glasspacks, then through a magnaflow muffler and out the bumper. It's 3" all the way back wide open mandrel bends no cat. Welded an O2 bung about 3' from the head for the wideband. Used 1/16 6013's for like 5 minutes of welding. They SUCKED. You could lay down a perfect bead and it wouldn't stick! WTF? I dunno it looked great and didn't burn through but was slow and wouldn't penetrate right. So I broke out the old reliable 3/16 7018's.
Had to use 65 amps and go FAST or you burn a huge hole. Pretty much all the joints were butted together so yeah, that's hard to do. But I managed. Exhaust note is weird. At idle you can't even hear it. Below 2K it's super quiet, like quieter than stock. But at higher RPMs it's loud. Gonna swap to a baffled muffler eventually.
Anyway here's the pics.
Dual feed fuel rails I made
Mallory 30-100PSI FPR
Phierburg booster fuel pump.
Wiring harness
Exhaust: Pics taken at night on my lift right after I finished it so they aren't great.
Pics while the I.M. was off. I did a lot of custom headwork a while back. You can see the undercut and pollished valves.
Anyways after the exhaust system I put the rest back together and I'm back at school now. Not sure what I'm gonna do. I could finish the SC stuff. I might. I'm probably gonna turbo it though. It's easy and it works. Maybe finish the SC stuff in a few years when this car isn't my DD. Or I might finish this SC ----. Undecided. I need boost so turbo is looking pretty good right now.
Ok, that puts me 1 week before I had to go back to school. I stopped and bolted the stock I.M. back on and focused on other things. First priority was to get it running. Well the cars' stock wiring sucked. I had MS2E running parallel with the stock ECU and stock fuel and ignition system but that was a joke and a wiring nightmare. Had a million ------- black wires under the dash with tape and a number on them. Sucked. So I made a new standalone wiring harness to run the engine and its' peripherals. New harness consist of a 12' long DB37 cable that plugs into the MS2. It runs under the car below the passengers side seat and forward through the transmission tunnel and into the engine bay. I added 5 fused switched relays for MS to control the fans, LC-1 wide band, ignition system, fuel injectors, and something else. Took 2 days to build the wiring harness and install it. Surprisingly everything worked from the get go. Turned the key and it cranked and idled and everything worked. I never had to change the first wire (proof-god answers prayers). Running low ohm RC 550's right now at 62PSI fuel pressure. Also running EDIS4 with a triggerwheel setup I built. So it ran, but I had no exhaust.
So with like 5 days left before I had to go to college I took a day off and went and bought me a new motor for my car. has 82K miles on it for 88 after tax at the local pick and pull. Complete longblock with header and fuel rail. Got it sitting on an engine stand right now 'just incase'. It's also has a stronger bottom end (main bearing support plate) and lower compression than my miata engine. But my head is better so I'd only use the shortblock.
Ok back to car: Well I needed the header to build my exhaust system. My car came with a cast iron mani/pre cat stock. New header is 4 tiny pipes into a 3" collector that tapered to like a 2". I cut it where it's 3" and started running my exhaust. The exhaust snakes down under the car where it goes through 3 glasspacks, then through a magnaflow muffler and out the bumper. It's 3" all the way back wide open mandrel bends no cat. Welded an O2 bung about 3' from the head for the wideband. Used 1/16 6013's for like 5 minutes of welding. They SUCKED. You could lay down a perfect bead and it wouldn't stick! WTF? I dunno it looked great and didn't burn through but was slow and wouldn't penetrate right. So I broke out the old reliable 3/16 7018's.
Had to use 65 amps and go FAST or you burn a huge hole. Pretty much all the joints were butted together so yeah, that's hard to do. But I managed. Exhaust note is weird. At idle you can't even hear it. Below 2K it's super quiet, like quieter than stock. But at higher RPMs it's loud. Gonna swap to a baffled muffler eventually.Anyway here's the pics.
Dual feed fuel rails I made
Mallory 30-100PSI FPR
Phierburg booster fuel pump.
Wiring harness
Exhaust: Pics taken at night on my lift right after I finished it so they aren't great.
Pics while the I.M. was off. I did a lot of custom headwork a while back. You can see the undercut and pollished valves.
Anyways after the exhaust system I put the rest back together and I'm back at school now. Not sure what I'm gonna do. I could finish the SC stuff. I might. I'm probably gonna turbo it though. It's easy and it works. Maybe finish the SC stuff in a few years when this car isn't my DD. Or I might finish this SC ----. Undecided. I need boost so turbo is looking pretty good right now.
08-27-2008, 10:33 PM
#130
0.0 BAR
Thread Starter
Join Date: Apr 2008
Posts: 0
Re: Twin Supercharged Miata Build (56K Beware)
I didn't port it. I uncercut the valves and pollished them, blended the seats into the combustion chamber and into the throat, and unshrouded the ---- out of the valves. 25% the diameter of the exhaust valves, 30% on the intakes. Spent 36 hours working it after dissasembly. Half that time was within 1" of the seats.
