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Thread: Interest in full stainless 3inch tgp downpipes

  1. #1
    Mach 5's Avatar

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    Interest in full stainless 3inch tgp downpipes

    Trying to figure out how much interest is in a tgp 3 inch downpipe. I have one on my car right now it uses a stock 5 bolt flange modified for a 3inch pipe with a louvered style over a weave style flex pipe and a v- band clamp. I have no idea whether it will fit on an automatic trans and with an abs unit installed. I have it on a getrag 282 and a 284 with a regular vacuum booster. Modfication for fitment?? You will have to slightly custom fit the heat shield by the power steering rack on the fire wall and by the cat using a ball peen hammer. These will by made for cars without a catalytic converter that will have to be added by the installer. All welded sections inside the pipe will be smoothed for flow. I am very anal about this..

    the only difference is that the new piece will be full stainless and not stainless pipe welded using flux core wire. These take a while to make and Im still setting up my welder for the stainless / gas combo rather than flux wire. Also still need to make a jig. Est price will be in upwards of $800. Sounds like much but they take 4-6 hours to make plus $450 in supplys. Im looking else where to bring the cost down cuz this is pricey.

    Performance increase? let me put it to you this way.. If you dont port your wastegate, your stock wastegate will not flow enough to reduce the boost. I will provide a dyno graph at some point and I will pay for a persons dyno if they send me results using my parts along with a video that corresponds with it.

    Im hoping to get this going possibly mid march/ april.. Right now Im still working on the mold for the tgp's lower valence.. see other group buy

    Spoon93@gmail.com

    -Radical Revs Modifications and Repairs-

    -Jarek
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    Last edited by Mach 5; 01-23-2012 at 11:22 PM.
    Founder of the Radical Revs Racing Team- Radical Revs Modifications and Repairs
    Mach 5- 1989 Pontiac Grand Prix SE w/ Getrag 284, Plan is to build highest power twin turbo LG5 v6. stay tuned.. http://www.w-body.com/showthread.php...-60-degree-TGP
    Racer X- 1990 McLaren TGP- daily driver.. LG5, roller cam and GT3076R equiped http://www.w-body.com/showthread.php...w-build-dd-TGP!!
    Mach GOGOGO- AE86 track car- 4age 20v 1900lb [email]162hp@8200rpm

  2. #2
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    if you can guarantee this will fit a PM3, 4T60HD car, I'm listening.

    Mandrel bent?

    I'd like to see one done (I've seen your first one) when you're done making the jig.
    Matt Shantz


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    Mach 5's Avatar

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    I might be able to work out a deal if someone is willing to test fit on a PM3, auto car.. All Ive got here are manual cars without abs.
    Founder of the Radical Revs Racing Team- Radical Revs Modifications and Repairs
    Mach 5- 1989 Pontiac Grand Prix SE w/ Getrag 284, Plan is to build highest power twin turbo LG5 v6. stay tuned.. http://www.w-body.com/showthread.php...-60-degree-TGP
    Racer X- 1990 McLaren TGP- daily driver.. LG5, roller cam and GT3076R equiped http://www.w-body.com/showthread.php...w-build-dd-TGP!!
    Mach GOGOGO- AE86 track car- 4age 20v 1900lb [email]162hp@8200rpm

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    Mach 5's Avatar

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    This is an example of how much this new downpipe flows. you will outflow your stock wastegate and it will need to be ported.. http://www.youtube.com/watch?v=0UxsP...6&feature=plcp
    Founder of the Radical Revs Racing Team- Radical Revs Modifications and Repairs
    Mach 5- 1989 Pontiac Grand Prix SE w/ Getrag 284, Plan is to build highest power twin turbo LG5 v6. stay tuned.. http://www.w-body.com/showthread.php...-60-degree-TGP
    Racer X- 1990 McLaren TGP- daily driver.. LG5, roller cam and GT3076R equiped http://www.w-body.com/showthread.php...w-build-dd-TGP!!
    Mach GOGOGO- AE86 track car- 4age 20v 1900lb [email]162hp@8200rpm

  5. #5
    I got a jig here. all you would need to do is send the steel to my welder and he can build one for you. the stock flange is weak though.

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    Mach 5's Avatar

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    stock flange is weak?? Is that when its just the flange? I leave part of the pipe attached then mate it to the 3 inch pipe. have yet to have any issues..
    Founder of the Radical Revs Racing Team- Radical Revs Modifications and Repairs
    Mach 5- 1989 Pontiac Grand Prix SE w/ Getrag 284, Plan is to build highest power twin turbo LG5 v6. stay tuned.. http://www.w-body.com/showthread.php...-60-degree-TGP
    Racer X- 1990 McLaren TGP- daily driver.. LG5, roller cam and GT3076R equiped http://www.w-body.com/showthread.php...w-build-dd-TGP!!
    Mach GOGOGO- AE86 track car- 4age 20v 1900lb [email]162hp@8200rpm

  7. #7
    I like to keep exhaust velocity up for 7-12 inches or so out from the wheel.

    I just say stock is weak since I have a 3/4" thick mild steel flange. not sure if you can even find them any more though. I wanted to buy a couple more but didn't see them anymore on ebay. I am sure you could get a cnc guy to build a run of them.

    it had a perfect cavity machined in low profile for the wastegate door. I have pics in my thread of it. fucking works perfect.

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    Mach 5's Avatar

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    I will check it out! I happen to like the stock set for the first 3 inches its got a nice smooth flow down to the size of the pipe. for cost effectiveness I am going to start with a modified stock flange then perhaps go from there. same thing I do all my welding while Im not the best I have yet to have a weld break on anything. I cant wait to switch to gas though it would be soo much cleaner.
    Founder of the Radical Revs Racing Team- Radical Revs Modifications and Repairs
    Mach 5- 1989 Pontiac Grand Prix SE w/ Getrag 284, Plan is to build highest power twin turbo LG5 v6. stay tuned.. http://www.w-body.com/showthread.php...-60-degree-TGP
    Racer X- 1990 McLaren TGP- daily driver.. LG5, roller cam and GT3076R equiped http://www.w-body.com/showthread.php...w-build-dd-TGP!!
    Mach GOGOGO- AE86 track car- 4age 20v 1900lb [email]162hp@8200rpm

  9. #9
    you should still make em like that though. I had him make me a 2.5 mild steel with the stock flange. I am putting that on the 3400 in the 88. the red tgp needs an exhaust redo as well. I may have to get into some welding myself!

    aw fuck it. I just like to drink beer and watch!

  10. #10
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    maybe make one up in your jig but just tack it up good, I'll test fit to make sure it fits,(easier to mod if its just tacked) make appropriate changes if need be and document them, then have it welded up.
    Matt Shantz


    '95 Oldsmobile Cutlass Supreme Vert LQ1
    '94 Oldsmobile Cutlass Supreme Vert LQ1
    '90 Pontiac Turbo Grand Prix #0058 of 2749
    '92 Pontiac Grand Prix GTP - 282
    '92 Chevrolet Lumina Z34 - 284
    '88 Pontiac Fiero GT - 282
    '01 Cadillac Seville STS - Corsa
    '01 GMC Yukon Denali - GM 22's

    Quote Originally Posted by Mach 5
    Car is machine, Matt is boss status trained precision task killer..









  11. #11
    Quote Originally Posted by GOT2B GM View Post
    maybe make one up in your jig but just tack it up good, I'll test fit to make sure it fits,(easier to mod if its just tacked) make appropriate changes if need be and document them, then have it welded up.

    this.

    also when you make the jig, it is good to have an old t-25 exhaust housing on a pos stock x-over you aren't using maybe. then bolt up all the flanges like it was on a car. this is good for aligning the DP with the X-over and especially for building one for a automatic car. limited space so you need it as close to the x-over as you can.

    just weld the turbo exhaust section to the jig base with the Xover bolted on basically.

  12. #12
    Mach 5's Avatar

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    thats exactly what I was thinking! I have an idea on exactly how its gonna be. The next up coming weeks Im going to be talking to suppliers so i can get the cost down if possible. I know the flex pipe alone was maybe $80 if I remember correctly I already get a discount since I do a ton of business so I cant remember how much I paid but you never know.. due time.

    keep the ideas rolling!! its well appreciated
    Founder of the Radical Revs Racing Team- Radical Revs Modifications and Repairs
    Mach 5- 1989 Pontiac Grand Prix SE w/ Getrag 284, Plan is to build highest power twin turbo LG5 v6. stay tuned.. http://www.w-body.com/showthread.php...-60-degree-TGP
    Racer X- 1990 McLaren TGP- daily driver.. LG5, roller cam and GT3076R equiped http://www.w-body.com/showthread.php...w-build-dd-TGP!!
    Mach GOGOGO- AE86 track car- 4age 20v 1900lb [email]162hp@8200rpm

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  14. #14
    Mach 5's Avatar

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    ok now starting jig this weekend while my car is apart.

    pre-orders coming soon! after jig is completed projected time for each order will take approx 1 month depending on my parts supplier. Price still un known need to calculate.

    -Jarek
    Founder of the Radical Revs Racing Team- Radical Revs Modifications and Repairs
    Mach 5- 1989 Pontiac Grand Prix SE w/ Getrag 284, Plan is to build highest power twin turbo LG5 v6. stay tuned.. http://www.w-body.com/showthread.php...-60-degree-TGP
    Racer X- 1990 McLaren TGP- daily driver.. LG5, roller cam and GT3076R equiped http://www.w-body.com/showthread.php...w-build-dd-TGP!!
    Mach GOGOGO- AE86 track car- 4age 20v 1900lb [email]162hp@8200rpm

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    Mach 5's Avatar

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    just finished fabbing up the jigs.. now got to set up my welder for stainless wire and a tank. soon to be taken pre-orders..
    Founder of the Radical Revs Racing Team- Radical Revs Modifications and Repairs
    Mach 5- 1989 Pontiac Grand Prix SE w/ Getrag 284, Plan is to build highest power twin turbo LG5 v6. stay tuned.. http://www.w-body.com/showthread.php...-60-degree-TGP
    Racer X- 1990 McLaren TGP- daily driver.. LG5, roller cam and GT3076R equiped http://www.w-body.com/showthread.php...w-build-dd-TGP!!
    Mach GOGOGO- AE86 track car- 4age 20v 1900lb [email]162hp@8200rpm

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