Thread: Twin engine GTP project progress thread

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  1. #221 Re: Twin engine GTP project progress thread 
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    You guys are killing me. I have so many parts cars laying around...really makes me want to twin engine my Park Avenue, it wouldn't cost much, just a lot of time and fab.
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  2. #222 Re: Twin engine GTP project progress thread 
    GTP Level Member TwinV6GTP's Avatar
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    We installed the parts car trans in the back and will be doing 2nd gear launch to see if that can help keep the trans healthy.

    Just ran out of time finishing the install to go racing.


    Sent from my iPhone
    2015 Custom Twin Engine Nascar style car with dual GTP 3.8 drivetrain, Front trans 4T65e-HD, Rear 4t80e trans 1/4 mile 8.38 @ 165mph
    2000 GP Twin Engine Twin TD Turbo kits. Stock engines stock trans(s) stock injectors stock MAFs 0-60mph 1.8 seconds 1/4 mile 9.72 @ 139 mph
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  3. #223 Re: Twin engine GTP project progress thread 
    GTP Level Member TwinV6GTP's Avatar
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    Quote Originally Posted by Turbocharged400sbc View Post
    keep it there you dont want that weight at the back of the vehicle. our new chassis is goin to only have the fuel cell that's at the rear of the car...it looks like we might be able to do saddle fuel tanks in front of the rear engine with the new radiator set up...but the fallback is at the rear...away from the driver lol

    your goin two want to try to keep as much of the weight towards the CoG.
    Yes we did do that. Surprisingky the car is well balanced and with the new suspension configuration it really helps keep the front wheels useful.
    I need a much stiffer shock because with all the preload there is a little pogo effect. Otherwise it drives very nice and feels very stable and launches in straightline


    Sent from my iPhone
    2015 Custom Twin Engine Nascar style car with dual GTP 3.8 drivetrain, Front trans 4T65e-HD, Rear 4t80e trans 1/4 mile 8.38 @ 165mph
    2000 GP Twin Engine Twin TD Turbo kits. Stock engines stock trans(s) stock injectors stock MAFs 0-60mph 1.8 seconds 1/4 mile 9.72 @ 139 mph
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  4. #224 Re: Twin engine GTP project progress thread 
    GXP Level Member Turbocharged400sbc's Avatar
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    yeah we have to utilize double adj mustang front struts in the rear to have any compression adjustment

    its sucks that we cant use any differential reaction forces on our heaps....
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
    1994 Oldsmobile 442 (462ci-4wd-2 engines) L67/4t80e^2,
    00 Turbo Regal 608 fwhp 575ftlbs at 5500rpm, 98 WhippledRiv, 97 GTP
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  5. #225 Re: Twin engine GTP project progress thread 
    SE Level Member AndrewZ28's Avatar
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    Insane project! Now I really want a turbo...

    2003 SE TONS of Mods= New O2 Sensor, New Headlights, New EGR Valve... About 345whp


    Quote Originally Posted by Iceman6669 View Post
    It's a Grand Prix... There's always a problem
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  6. #226 Re: Twin engine GTP project progress thread 
    GTP Level Member TwinV6GTP's Avatar
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    Thanks.

    In my opinion these engine are really made to be turbo.
    A lot less kr and much more power. In my 07 turbo gt im running 19-20psi daily on pump and methanol inj. With 17 deg advance


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    2015 Custom Twin Engine Nascar style car with dual GTP 3.8 drivetrain, Front trans 4T65e-HD, Rear 4t80e trans 1/4 mile 8.38 @ 165mph
    2000 GP Twin Engine Twin TD Turbo kits. Stock engines stock trans(s) stock injectors stock MAFs 0-60mph 1.8 seconds 1/4 mile 9.72 @ 139 mph
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  7. #227 Re: Twin engine GTP project progress thread 
    GXP Level Member darkhorizon's Avatar
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    if you take a 30lb/m compressor off and put a 70lb/m compressor on... with an intercooler.... its probably going to make more power.....
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  8. #228 Re: Twin engine GTP project progress thread 
    GTP Level Member TwinV6GTP's Avatar
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    Quote Originally Posted by darkhorizon View Post
    if you take a 30lb/m compressor off and put a 70lb/m compressor on... with an intercooler.... its probably going to make more power.....
    That's not the point I was trying to make...

    These engines when all stock, are Iron head Iron block. Which means low heat dissapation potential. That means KR !
    Now add a Non intercooled M90 on it and you got a stock engine with a lot of KR even with low timing.

    The same M90 on a full aluminum head and block with slightly lower compression could run a lot more boost and power without knock.
    The turbo makes it easy to intercool properly plus it's more efficient. That all translate to being to run a lot of boost with no knock and more timing.

    That's why I say they are made to be turbo. They don't have the right specs to take advantage of M90 on pump gas.
    2015 Custom Twin Engine Nascar style car with dual GTP 3.8 drivetrain, Front trans 4T65e-HD, Rear 4t80e trans 1/4 mile 8.38 @ 165mph
    2000 GP Twin Engine Twin TD Turbo kits. Stock engines stock trans(s) stock injectors stock MAFs 0-60mph 1.8 seconds 1/4 mile 9.72 @ 139 mph
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  9. #229 Re: Twin engine GTP project progress thread 
    GTP Level Member TwinV6GTP's Avatar
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    Quote Originally Posted by Turbocharged400sbc View Post
    yeah we have to utilize double adj mustang front struts in the rear to have any compression adjustment

    its sucks that we cant use any differential reaction forces on our heaps....
    How's the fitment on those struts in the back ?
    2015 Custom Twin Engine Nascar style car with dual GTP 3.8 drivetrain, Front trans 4T65e-HD, Rear 4t80e trans 1/4 mile 8.38 @ 165mph
    2000 GP Twin Engine Twin TD Turbo kits. Stock engines stock trans(s) stock injectors stock MAFs 0-60mph 1.8 seconds 1/4 mile 9.72 @ 139 mph
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  10. #230 Re: Twin engine GTP project progress thread 
    GXP Level Member darkhorizon's Avatar
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    dumb.

    The m90 mustangs made 340whp intercooled on big displacement crap.

    3800s will do that unintercooled with a cam and a decent exhaust.
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  11. #231 Re: Twin engine GTP project progress thread 
    GXP Level Member 91parkave's Avatar
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    Lol^^
    Dark, a m90 mustang with a v8. is only on 7psi, the 3800 at around the same power level has more than likley dropped down to a 2.8, do the same on that mustang and see what happens. just saying thats a really dumb analogy you made



    anyways twinGTP check these shocks

    http://www.americanmuscle.com/qa1-si...ntV1&year=2011
    06 GXP | 222/227 cam/cartuning turbo kit on 8psi/meth/e85 coilovers/ still on stock trans at 130k
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  12. #232 Re: Twin engine GTP project progress thread 
    GTP Level Member TwinV6GTP's Avatar
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    Anyways twinGTP check these shocks

    http://www.americanmuscle.com/qa1-si...ntV1&year=2011
    These are the right lenght for the GTP ?

    IN the back I ended up with the factory shocks/springs but they are heavily preloaded to reduce squatting to a minimum.
    I would need struts or shocks that are extremely stiff that are rear stock style.
    2015 Custom Twin Engine Nascar style car with dual GTP 3.8 drivetrain, Front trans 4T65e-HD, Rear 4t80e trans 1/4 mile 8.38 @ 165mph
    2000 GP Twin Engine Twin TD Turbo kits. Stock engines stock trans(s) stock injectors stock MAFs 0-60mph 1.8 seconds 1/4 mile 9.72 @ 139 mph
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  13. #233 Re: Twin engine GTP project progress thread 
    GTP Level Member Silver2kgtp's Avatar
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    I tip my hat to you. Pure awesome

    http://s1292.photobucket.com/user/si...d%20Prix%20GTP
    10.99 @ 121.99 1.74 60' (Ran out of fuel : +18 AFR)NO SPRAY!!!
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  14. #234 Re: Twin engine GTP project progress thread 
    GXP Level Member Turbocharged400sbc's Avatar
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    single adjustable is useless you need to have compression adjustment so it's a double adjustable that you're looking for
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
    1994 Oldsmobile 442 (462ci-4wd-2 engines) L67/4t80e^2,
    00 Turbo Regal 608 fwhp 575ftlbs at 5500rpm, 98 WhippledRiv, 97 GTP
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  15. #235 Re: Twin engine GTP project progress thread 
    GTP Level Member TwinV6GTP's Avatar
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    Quote Originally Posted by Turbocharged400sbc View Post
    single adjustable is useless you need to have compression adjustment so it's a double adjustable that you're looking for
    Right now with what I've got just a stiff rebound would work well as I can already adjust spring rate. With the high spring rate comes the pogo effect with tired stock struts.
    2015 Custom Twin Engine Nascar style car with dual GTP 3.8 drivetrain, Front trans 4T65e-HD, Rear 4t80e trans 1/4 mile 8.38 @ 165mph
    2000 GP Twin Engine Twin TD Turbo kits. Stock engines stock trans(s) stock injectors stock MAFs 0-60mph 1.8 seconds 1/4 mile 9.72 @ 139 mph
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  16. #236 Re: Twin engine GTP project progress thread 
    GXP Level Member Turbocharged400sbc's Avatar
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    I'm not talking about the spring or any of that the rear compresses so you're gonna want the valving stiff so that it sets down slowly.

    if he's going to get conventional single adjustable rebound the only good option is to only put them in the front.
    in the rear just get regular replacements. stiffer rebound in the rear is gonna do nothing for you. at least up front and they will help keep the front end from lifting as fast
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
    1994 Oldsmobile 442 (462ci-4wd-2 engines) L67/4t80e^2,
    00 Turbo Regal 608 fwhp 575ftlbs at 5500rpm, 98 WhippledRiv, 97 GTP
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  17. #237 Re: Twin engine GTP project progress thread 
    GTP Level Member TwinV6GTP's Avatar
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    Quote Originally Posted by Turbocharged400sbc View Post
    I'm not talking about the spring or any of that the rear compresses so you're gonna want the valving stiff so that it sets down slowly.

    if he's going to get conventional single adjustable rebound the only good option is to only put them in the front.
    in the rear just get regular replacements. stiffer rebound in the rear is gonna do nothing for you. at least up front and they will help keep the front end from lifting as fast
    When you get on the brakes on the top end, the rear rebound is super important. It prevents too quick of a weight transfer up front. In my case the springs are soo stiff that weight transfer isn't an issue however the Shock rate can't keep up and then you get the wave effect from front to back. That said It's not that bad at reasonable speed.

    We did some 1/8 mile testing and it ran great no problems, didn't feel dangerous but we are trapping 6.8 @ 103 mph right now with the same power as on the video (60%)
    But on the end of the 1/4 mile that is 132 mph+ and getting on the brakes might start a dance from front to back.

    Not counting the fact I will be making a lot more power in the back and will be turbo in the front. So traps will be MUCH higher as well as E.T. much lower.

    At the moment we are converting the front engine to turbo.
    2015 Custom Twin Engine Nascar style car with dual GTP 3.8 drivetrain, Front trans 4T65e-HD, Rear 4t80e trans 1/4 mile 8.38 @ 165mph
    2000 GP Twin Engine Twin TD Turbo kits. Stock engines stock trans(s) stock injectors stock MAFs 0-60mph 1.8 seconds 1/4 mile 9.72 @ 139 mph
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  18. #238 Re: Twin engine GTP project progress thread 
    GXP Level Member Turbocharged400sbc's Avatar
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    yeah you should play with your engine braking tables.

    it makes a crapload of difference though you will want to reflash it if you're gonna drive it on the highway cuz otherwise it's quite annoying
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
    1994 Oldsmobile 442 (462ci-4wd-2 engines) L67/4t80e^2,
    00 Turbo Regal 608 fwhp 575ftlbs at 5500rpm, 98 WhippledRiv, 97 GTP
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  19. #239 Re: Twin engine GTP project progress thread 
    GTP Level Member TwinV6GTP's Avatar
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    2015 Custom Twin Engine Nascar style car with dual GTP 3.8 drivetrain, Front trans 4T65e-HD, Rear 4t80e trans 1/4 mile 8.38 @ 165mph
    2000 GP Twin Engine Twin TD Turbo kits. Stock engines stock trans(s) stock injectors stock MAFs 0-60mph 1.8 seconds 1/4 mile 9.72 @ 139 mph
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  20. #240 Re: Twin engine GTP project progress thread 
    GrandPrix Junkie Sandman's Avatar
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    I like this
    05 Saab 9-2X Linear (Saabaru)
    77 Morris Garage B
    Quote Originally Posted by TLSheff View Post
    You said "I'm done with it"... car says "Oh, really? *trollface*"
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