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Old 04-26-2015, 08:18 AM   #1
Ether-D
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Power-curve straightened...

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.
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Quote:
Originally Posted by Andy.B
Whenever I am about to make a particularly questionable decision regarding a worryingly cheap diy solution, I just ask myself, "What would Ether-D do?"
1987 325iS m30b34 Muscle car (Engine electrical phase)
~~~~~~~~~~
I was born on 3/25…
~~~~~~~~~~

Last edited by Ether-D; 04-27-2015 at 05:06 AM.
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Old 04-26-2015, 08:28 AM   #2
Mr. Tasty
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I like it, did you ever get any numbers from the non-intercooled setup?
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Old 04-26-2015, 08:37 AM   #3
Ether-D
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No official numbers. I have an app called Dynolicious that claimed it made 216hp. I'll do a run in the new setup to see how it compares though. I'm gonna have the 2.7i dyno tuned soon, so I'll have some actual numbers for yous.
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Quote:
Originally Posted by Andy.B
Whenever I am about to make a particularly questionable decision regarding a worryingly cheap diy solution, I just ask myself, "What would Ether-D do?"
1987 325iS m30b34 Muscle car (Engine electrical phase)
~~~~~~~~~~
I was born on 3/25…
~~~~~~~~~~

Last edited by Ether-D; 04-26-2015 at 09:36 AM.
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Old 04-26-2015, 09:44 AM   #4
TheTacoMan
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Ive done alot of research into twin charging, one of the main issues is that it compounds the boost. 6psi on a supercharger and 6 psi on a turbo charger does not equate to 12psi of net boost, its is much more.
Also to run a big turbo for top end at 7-8 psi requires a decent size waste gate so you do not get boost creep.
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Old 04-26-2015, 09:56 AM   #5
Ether-D
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Yeah, from what I've read, it seems like you end up with the sum of the two boost numbers plus about a third more. So 6psi turbo and 6psi supercharger make something like 16psi if/when they peak at the same time.
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Quote:
Originally Posted by Andy.B
Whenever I am about to make a particularly questionable decision regarding a worryingly cheap diy solution, I just ask myself, "What would Ether-D do?"
1987 325iS m30b34 Muscle car (Engine electrical phase)
~~~~~~~~~~
I was born on 3/25…
~~~~~~~~~~
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Old 04-26-2015, 11:06 AM   #6
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Teeheehee.
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Old 04-26-2015, 11:40 AM   #7
Ether-D
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Quote:
Originally Posted by chondamx View Post
Teeheehee.
I mostly have this guy to blame for the turbo tomfoolery that has commenced…
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Quote:
Originally Posted by Andy.B
Whenever I am about to make a particularly questionable decision regarding a worryingly cheap diy solution, I just ask myself, "What would Ether-D do?"
1987 325iS m30b34 Muscle car (Engine electrical phase)
~~~~~~~~~~
I was born on 3/25…
~~~~~~~~~~
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Old 04-26-2015, 01:01 PM   #8
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Definitely get a reading of what your air intake temperatures are currently and try to get them as low as possible before twin charging, the addition of a turbo means more work is being done so alot more heat.
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Old 04-26-2015, 02:31 PM   #9
Ether-D
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Totally, methanol injection is next in line. Taco, could you give me a refresher course on meth/water injection?
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Quote:
Originally Posted by Andy.B
Whenever I am about to make a particularly questionable decision regarding a worryingly cheap diy solution, I just ask myself, "What would Ether-D do?"
1987 325iS m30b34 Muscle car (Engine electrical phase)
~~~~~~~~~~
I was born on 3/25…
~~~~~~~~~~
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Old 04-26-2015, 04:33 PM   #10
JGood
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That's awesome, can't believe it was hitting 6 psi at 2k. Why'd the boost drop with the 2.7?
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Old 04-26-2015, 04:45 PM   #11
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Old 04-26-2015, 04:46 PM   #12
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Quote:
Originally Posted by JGood View Post
That's awesome, can't believe it was hitting 6 psi at 2k. Why'd the boost drop with the 2.7?
For one, it has more volume to fill with air, but it did drop more than I thought it would, so it could have a bit of a leak somewhere also. I changed my method of gasketry on the intake manifold to supercharger seals, so it could be that they aren't working as well as they were previously.
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Quote:
Originally Posted by Andy.B
Whenever I am about to make a particularly questionable decision regarding a worryingly cheap diy solution, I just ask myself, "What would Ether-D do?"
1987 325iS m30b34 Muscle car (Engine electrical phase)
~~~~~~~~~~
I was born on 3/25…
~~~~~~~~~~
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Old 04-26-2015, 05:50 PM   #13
Andy.B
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Everything worked out well with the 2.7 bottom end? I'm glad!
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Old 04-26-2015, 06:22 PM   #14
Ether-D
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It is absolutely perfect. I could feel the crosshatching with my fingernail it was so defined still. Thanks Andy.B and Swanny!!!
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Quote:
Originally Posted by Andy.B
Whenever I am about to make a particularly questionable decision regarding a worryingly cheap diy solution, I just ask myself, "What would Ether-D do?"
1987 325iS m30b34 Muscle car (Engine electrical phase)
~~~~~~~~~~
I was born on 3/25…
~~~~~~~~~~
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Old 04-27-2015, 05:04 AM   #15
Ether-D
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I researched the methanol injection last night and found this website. I like his theory, so I found comparable stuff on ebay and purchased it. The main parts of the system (pump, nozzles, solenoid valve, and pressure switch) cost me $73. There will be several plumbing and wiring additions, but I see this setup being quite a bit more affordable than the kits on ebay.
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Quote:
Originally Posted by Andy.B
Whenever I am about to make a particularly questionable decision regarding a worryingly cheap diy solution, I just ask myself, "What would Ether-D do?"
1987 325iS m30b34 Muscle car (Engine electrical phase)
~~~~~~~~~~
I was born on 3/25…
~~~~~~~~~~
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