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Thread: 1988 TC single Holset turbo 5.0/ 4R70W

  1. #1121
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    Hey peeps!

    Man time flies. I've done quite a bit more work on the car. The turbo system is GONE. I think that Holset was an awful choice and was severely mismatched to the V8.

    Since removing it the car runs 100% better and all my water use and smoking problems are gone along with it.

    Removing the turbo, I had to get new proper V8 throttle and cruise control cables, re-flip the intake, re-do the fuel system, change injectors, remove the intercooler, relocate the PS reservoir, re-do the vacuum system, add a catch can, make a new air filter system, cut the turbo piping off the headers and flip them back to normal, add a Summit 2 1/2 inch H-pipe, buy and install a new dual exhaust (I used Mark V11 pipes and muffs) and totally re-tune the transmission and engine computers to match the new combo.

    While I was at it I glued on the dash cover......it has been free-floating for years LOL. I also hated the fuel pressure gauge, so I pulled it off, relocated the O/D light and wideband button to the steering wheel console and put a stock clock back in. I like it a lot better now, especially at night.

    I've been driving the car this way for a few months now and I like it a lot. Yesterday after pulling in to the drive, the overflow bottle began to puke out antifreeze. It turns out that the Dakota fan controller (or sending unit for it) has bit the dust. Today I'll be removing that and using the spare circuit I previously built into Megasquirt for water injection and re-purposing it to control the fan relay.

    Cheers!

    Jim

    non turbo2.jpgnon turbo1.jpgnon turbo.jpg

  2. #1122
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  3. #1123
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    And the new overflow bottle location. I still want to get the A/C hooked up since I have never gotten around to doing it yet. I just need to get a crimping tool and make hoses to complete that part.


    non turbo6.jpg

  4. #1124
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    Nice to see an update on this build. Was one of my favorites. Sucks that you had issues. Did you ever think of getting a more suited turbo for it? I did the 6.0L LSX swap in my 84 and will be adding a 7875 turbo. The turbo I choose is a bit small but will hit all my goals easy. Max power I want is around 700 at the wheels.

  5. #1125
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    Hey, Jim. Glad to see that you still have this. It's been a while!
    Long live the 4-eyes! - '83 Tbird Turbo

  6. #1126
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    Quote Originally Posted by 1WLD BRD View Post
    Nice to see an update on this build. Was one of my favorites. Sucks that you had issues. Did you ever think of getting a more suited turbo for it? I did the 6.0L LSX swap in my 84 and will be adding a 7875 turbo. The turbo I choose is a bit small but will hit all my goals easy. Max power I want is around 700 at the wheels.
    I did think about swapping turbos, but I decided instead to simplify the car. I felt that I wasn't using the turbo power much and with the new heads it has plenty of grunt.

    400+ is PLENTY for a street car IMHO.

    I got a Jaguar XKR with 400 supercharged ponies and that is perfect for me. You should get lots of grins with 700!

  7. #1127
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    Quote Originally Posted by Chuck W View Post
    Hey, Jim. Glad to see that you still have this. It's been a while!
    Hi Chuck. Yeah I still have it and the TR7 2.3 turbo. I took a year to swap back to normally aspirated due to laziness. LOL I also had some hand problems that are better now, so I can work in the garage again without pain. It sucks getting old!

  8. #1128
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    I hear you on the fan of not getting old. I just took the Tremec out of the bird on my back yesterday still tired glad to see you're back.
    87 Turbo Coupe through the floor sub frame connectors, 5.8 swap Ford racing heads Harland sharp 1.6 rockers BBK shorty swap headers 2 1/2 BBk X pipe magnaflow muffler's. Megasquirt 2 with 36lbs injectors on hurricane intake with 4150 throttle body.Tremec TKO 600 Quicktime blowsheild spec stage 3 clutch. 3.73 gears and still not done

  9. #1129
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    Thanks, man.

    Did you get that Megasquirt sorted out? I never did get a good idle using a Ford valve on MS1. In the end I just upped the idle and run it open loop for cold start. I threw in the towel after a LOT of messing with it.

    Why did you take out the Tremec? Problems or making a change?

  10. #1130
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    For the record, the issue with the Dakota fan controller was water intrusion onto the circuit board and a failed resistor. I used the water injection circuit on the breadboard I built long ago and used it to control the high speed fan and it is working fine.

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