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Old 05-27-2010, 12:25 AM   #1 (permalink)
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Homebuilt Budget Twin Turbo

(VIDEO added page three) $800 home built twin turbo setup. The car is my '87 Mustang GT. I picked it up 18 months ago for $1000. It needed a new clutch and a bit of TLC but the odometer showed 127,000 miles which isnt too bad.

I was gonna just pull the trans and replace the clutch, but the engine was very grimy so I figured why not pull it too so I can powerwash it and put some new gaskets in it. I got them out and stripped the 302 to the shortblock, then I figured why not put in a new set of rings and bearings, so I stripped it down bare and sent the crank, block and piston/rod assemblies to my machinist. He honed the cylinders, hammered in a new set of cam bearings and cleaned the bare block. The crank only needed a polish and I had him press in a set of ARP rod bolts.

I get all the pieces home, spend the next 6 weeks assembling the shortblock and TFS heads and top it off with a Parker Funnel Web. I spent 20 hours doing a bowl blend with the twisted wedge heads and port matching the funnel web intake with the TFS runners. The cam is a TFS stage 1, it specs out at 221/225 dur @ .050" and .499"/.510" lift in/ex with a 1.6 roller rocker. As far as the motor goes its really nothing special, just a heads/cam upgrade with a carb conversion. The compression ratio is still 9.3:1 and the Holley is an old 650 DP that I converted to run as a blow thru.

Now the fun stuff! The Blowthru Setup
The headers are home-made, they consist of some SB header flanges that I chopped off the original shortys, all the tubing from the flanges to the 3 1/2" collector is 1 5/8" mandrel bent. I bought a DIY weld up kit that came with a box of 1 5/8" bends, the funny part is the kit was for a small block Chevy and priced at $89 minus SBC header flanges. I reduced the 3 1/2" collector down to 2 1/2" and ran that to the T-3 flanges.

The turbos are cheap ebay .63/.50 A/R Ford turbo coupe knock-offs, they usually sell for $150-$200 apiece. The twin 38mm wastegates are $60 apiece ebay specials. BOV is a $40 you guessed it (ebay).

The charge pipe is another homemade piece consisting or 2 1/2" mandrel bent mild steel tubing, the two pipes meet and merge into a 4" tube that feeds into the 4" carb bonnet.











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Homebuilt Budget Twin Turbo-twinturbo.jpg  
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6.29 @ 112 MPH 1.48 60'. Home-fabbed twin turbo 302 at 3242 lbs. Fastest ugly Mustang on FM!

Last edited by james302; 06-23-2010 at 09:15 PM.
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Old 05-27-2010, 03:07 AM   #2 (permalink)
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Re: Homebuilt budget twin turbo pics

Awesome project! Me likey
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Old 05-27-2010, 05:06 AM   #3 (permalink)
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Re: Homebuilt budget twin turbo pics

Cool home build, keep us posted on how it runs.
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Old 05-27-2010, 07:14 AM   #4 (permalink)
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Re: Homebuilt budget twin turbo pics

Awesome, how does it run?
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Old 05-27-2010, 12:50 PM   #5 (permalink)
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Re: Homebuilt budget twin turbo pics

Thats a pretty sweet setup!! I'm curious how it runs also.
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Old 05-27-2010, 12:58 PM   #6 (permalink)
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Re: Homebuilt budget twin turbo pics

You should be running in the 9-10's easily. You have a roll bar yet??? . Great build up. Like the blue powdercoating you did. Put up a video of it running. Great job!!
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Old 05-27-2010, 01:09 PM   #7 (permalink)
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Re: Homebuilt budget twin turbo pics

Im glad you guys like it. Its not running yet but Im very close and I will be taking video.
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6.29 @ 112 MPH 1.48 60'. Home-fabbed twin turbo 302 at 3242 lbs. Fastest ugly Mustang on FM!
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Old 05-27-2010, 01:16 PM   #8 (permalink)
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Re: Homebuilt budget twin turbo pics

I only have 1/8th mile tracks in my area and they are much more leniant about the 7.50 roll bar rule. If it breaks into the 6s then they will probably limit me to 330' runs. Yeah no roll bar yet but its high on the priority list once this thing is running. Over the winter I welded in new floors and subframe connectors as well as reinforced torque boxes.
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6.29 @ 112 MPH 1.48 60'. Home-fabbed twin turbo 302 at 3242 lbs. Fastest ugly Mustang on FM!
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Old 05-27-2010, 05:48 PM   #9 (permalink)
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Re: Homebuilt budget twin turbo pics

Nice clutch replacement... I'd get some water injection on there or a tank of race gas before pushing it too hard. Those Chinese knockoff turbos are not as efficient and blow some pretty hot air. They'll do a fairly good job, but you'll have a tougher time with anti-knock than real Garretts. You may also need to add some restrictors to the oil feed lines so they don't push oil past the shaft rings and into the compressor. You'll know if you need them... lol.

David
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Old 05-27-2010, 07:08 PM   #10 (permalink)
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Re: Homebuilt budget twin turbo pics

Cool! Here are some other guys that do that stuff. Well, they used to more than they do now... toohighpsi.com
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Old 05-27-2010, 07:59 PM   #11 (permalink)
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Re: Homebuilt budget twin turbo pics

Quote:
Originally Posted by PSIG View Post
Nice clutch replacement... I'd get some water injection on there or a tank of race gas before pushing it too hard. Those Chinese knockoff turbos are not as efficient and blow some pretty hot air. They'll do a fairly good job, but you'll have a tougher time with anti-knock than real Garretts. You may also need to add some restrictors to the oil feed lines so they don't push oil past the shaft rings and into the compressor. You'll know if you need them... lol.

David
AIS has a meth/water injection kit that I am very interested in and its not too bad at $270. I will be running a 50/50
mix of pump gas and C16 for track use no matter what. The oil feed flange that I used has a .090" restrictor hole so hopefully it keeps me from burning too much oil. The clutch replacement part is pretty funny! That was all I intended to do and look how far that went, I didnt even replace the clutch! I'd make a terrible mechanic lol.
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6.29 @ 112 MPH 1.48 60'. Home-fabbed twin turbo 302 at 3242 lbs. Fastest ugly Mustang on FM!
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Old 05-27-2010, 08:05 PM   #12 (permalink)
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Re: Homebuilt budget twin turbo pics

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Cool! Here are some other guys that do that stuff. Well, they used to more than they do now... toohighpsi.com
Mike, that guy and his buddies were my original inspiration for building a turbo car. I remember reading everything on that site back in '03 when those guys had just hung up the towel. Very talented guys and I believe one of them is an engineer somehow tied in with forced induction?? My favorite project of theirs has to be the twin M90 supercharged 351w in the Thunderbird, that thing pulled its tires hard and ran middle 10s.
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6.29 @ 112 MPH 1.48 60'. Home-fabbed twin turbo 302 at 3242 lbs. Fastest ugly Mustang on FM!
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Old 05-27-2010, 08:26 PM   #13 (permalink)
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Very cool and nicely done. Let us know how it runs with the carb. I knew some guys running turbos with a carb, but they had some issues getting the turbos to work properly with a carb. Turbos seem to work better with fuel injection. I hope you get it running awesome
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Old 05-27-2010, 10:10 PM   #14 (permalink)
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Re: Homebuilt budget twin turbo pics

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Very cool and nicely done. Let us know how it runs with the carb. I knew some guys running turbos with a carb, but they had some issues getting the turbos to work properly with a carb. Turbos seem to work better with fuel injection. I hope you get it running awesome
Yeah the turbo and carb thing is going to haunt me all summer but I know that people do it so it is possible but probably not the best method.
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6.29 @ 112 MPH 1.48 60'. Home-fabbed twin turbo 302 at 3242 lbs. Fastest ugly Mustang on FM!
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Old 05-28-2010, 05:16 PM   #15 (permalink)
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Re: Homebuilt budget twin turbo pics

are those the SS chrome cheapy turbos from Evilbay?

If so I wouldnt have wasted my money, if they were. those turbos in the ford four banger turbo world are known for being huge pos's.

Good luck though I am a die hard turbo guy and have a turbo setup for my car in mind down the road.
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