The thread on the road to my supercharged m20b27i has grown too long to be useful to anyone but me. So here's a sum-up, along with some notable future additions. Future additions being a turbo and associated hardware, aka: twin charging.
I had read about 1,000 turbo cars and, well, it was covered. I wanted to break different ground. So I bought an Eaton M90 from a 89 Thunderbird off a guy on CL. $100 cash money.
So I went to work on a pulley setup. This is what I came up with. It's an m50 crank pulley in place of the a/c and power steering pulleys. A small piece of angle iron with a cut-off old head bolt welded to it for a idler pulley bracket. I just went to O'reilly and got some $15 idler pulley, from a Pontiac I think. I had a hub-centric spacer made of aluminum (about 5/8" thick) so the m50 power steering pulley would line up with the "new" crank pulley and the blower pulley. I'm using the power steering pump's tensioner. I mocked-up the intake manifold with scrap wood originally.
Then I went on to build the intake manifold. I just ran the stock m20 manifold through the table saw and left myself about 2" of original manifold runner and the flange. I then ordered a 12"x48" piece of 1/4" aluminum off of ebay. Super easy to cut up on the table saw. I made it into pieces of an intake mani to take to a pro to weld up for me.
I would need a by-pass valve to recirculate the boost when not hard on the throttle, so I looked on the web and found one from a Mini that just looked right and was "flat surface mountable". Plumbed it up and mounted it and voila!
Now that hose is just a cut-off m20 radiator hose and it does see vacuum when the throttle is closed, so I coiled up a piece of 10 gauge copper wire inside of it to keep it from imploding.
Bracket or two here, throttle body there, throw a Whodwho ms2 in there and you have yourself a backwoods, cheap as can be, fricking torquey as hell, m20b25 in your e30. It made 9.5 peak psi of boost, but it's usually around 7-8. Boost comes on immediately. It was making 6psi by 2000rpm.
I've since upgraded to a m20b27i and with the same setup it's now making 6.5psi peak and is usually in the 5psi range.
Also, no intercooler at this time, but I'll be adding methanol/water injection soon and a FMIC for the turbo when it happens.
If you have any questions, I'll be happy to answer to the best of my ability.
Now, on to the "whys"?
Because I like building shit. That's why.
I had read about 1,000 turbo cars and, well, it was covered. I wanted to break different ground. So I bought an Eaton M90 from a 89 Thunderbird off a guy on CL. $100 cash money.
So I went to work on a pulley setup. This is what I came up with. It's an m50 crank pulley in place of the a/c and power steering pulleys. A small piece of angle iron with a cut-off old head bolt welded to it for a idler pulley bracket. I just went to O'reilly and got some $15 idler pulley, from a Pontiac I think. I had a hub-centric spacer made of aluminum (about 5/8" thick) so the m50 power steering pulley would line up with the "new" crank pulley and the blower pulley. I'm using the power steering pump's tensioner. I mocked-up the intake manifold with scrap wood originally.
Then I went on to build the intake manifold. I just ran the stock m20 manifold through the table saw and left myself about 2" of original manifold runner and the flange. I then ordered a 12"x48" piece of 1/4" aluminum off of ebay. Super easy to cut up on the table saw. I made it into pieces of an intake mani to take to a pro to weld up for me.
I would need a by-pass valve to recirculate the boost when not hard on the throttle, so I looked on the web and found one from a Mini that just looked right and was "flat surface mountable". Plumbed it up and mounted it and voila!
Now that hose is just a cut-off m20 radiator hose and it does see vacuum when the throttle is closed, so I coiled up a piece of 10 gauge copper wire inside of it to keep it from imploding.
Bracket or two here, throttle body there, throw a Whodwho ms2 in there and you have yourself a backwoods, cheap as can be, fricking torquey as hell, m20b25 in your e30. It made 9.5 peak psi of boost, but it's usually around 7-8. Boost comes on immediately. It was making 6psi by 2000rpm.
I've since upgraded to a m20b27i and with the same setup it's now making 6.5psi peak and is usually in the 5psi range.
Also, no intercooler at this time, but I'll be adding methanol/water injection soon and a FMIC for the turbo when it happens.
If you have any questions, I'll be happy to answer to the best of my ability.
Now, on to the "whys"?
Because I like building shit. That's why.
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