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Thread: Rear mount turbo

  1. #31
    Registered User lukevl's Avatar
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    Quote Originally Posted by Ben Wilson View Post
    Fixed...
    Didn't you see my video? Under it's own steam and everything!

    But yes still in the build and will take a lot of upkeep to keep it that pretty

  2. #32
    Registered User JZK25's Avatar
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    Quote Originally Posted by lukevl View Post
    This is my mate’s long term build. L77 too. Been on the dyno a few times and just trying some things to reduce lag currently. Be worth talking to him if you’re going ahead with a build

    ]
    Firstly, car looks amazing.

    Reducing lag. Fit std cast exhaust manifolds and use 2.25" piping with no mufflers tot he turbos. The turbine is driven by heat and velocity, extractors, big diameter pipe and mufflers are designed to reduce all those things.

    I can't see the charge pipe size but make it small, 2" max.
    David Fraser - Automotive Historian!

    Quote Originally Posted by bigmuz View Post
    You can't polish a turd but you can put 600hp in it and laugh your fucking arse off coming past someone sideways at Powercruise.

  3. #33
    Registered User dnegative's Avatar
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    Oiling suggestions?
    Quote Originally Posted by cracka View Post
    Fuck I'm retarded

  4. #34
    Registered User lukevl's Avatar
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    Quote Originally Posted by JZK25 View Post
    Firstly, car looks amazing.

    Reducing lag. Fit std cast exhaust manifolds and use 2.25" piping with no mufflers tot he turbos. The turbine is driven by heat and velocity, extractors, big diameter pipe and mufflers are designed to reduce all those things.

    I can't see the charge pipe size but make it small, 2" max.
    Thanks for the tips Al. Pretty close to what he’s trying. He had some 3” sections in the exhaust which are getting reduced but still twin 2.5”. No mufflers is a good idea but it’s already quite loud- maybe needs to bite the bullet and just remove them. The intake is a custom billet job with a huge volume leading up to the throttle body. It needs to stay for aesthetics but I suggested reducing the volume a lot by fabbing up internal charge pipes.

    I just want him to finish it!

  5. #35
    Arrogant wankeler Slides's Avatar
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    Is it just me or is that panhard rod a curious shape?

  6. #36
    Registered User lukevl's Avatar
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    Quote Originally Posted by JZK25 View Post
    Firstly, car looks amazing.

    Reducing lag. Fit std cast exhaust manifolds and use 2.25" piping with no mufflers tot he turbos. The turbine is driven by heat and velocity, extractors, big diameter pipe and mufflers are designed to reduce all those things.

    I can't see the charge pipe size but make it small, 2" max.
    Here is the intake. I'm 100% behind the build and design and it looked dumb with smaller pipes so I suggested trialling a ghetto setup with twin 2" pipes to see how it performs then do some fab magic to hide them inside this intake setup so it looks big but works. Unfortunately his motivation is low after almost 15 years in the build. Need to get him back on it


  7. #37
    Grumpy cunt ChrisS's Avatar
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    Damien Lowes VB Commodore project.
    He will be using the rear 1/4 "vents" behind the rear doors and panel filters.

    / --------------- \
    _/ /___________\ \_
    /_________|_________\
    |OOO ___________ OOO|
    \______|====|______/
    [_]-------------------[_]


  8. #38
    Registered User lukevl's Avatar
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    Rear turbo early-bird commos represent!

  9. #39
    Registered User JZK25's Avatar
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    G25 660's, mah homie.
    David Fraser - Automotive Historian!

    Quote Originally Posted by bigmuz View Post
    You can't polish a turd but you can put 600hp in it and laugh your fucking arse off coming past someone sideways at Powercruise.

  10. #40
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    Ah, I reckon twin rear mounts are fatally flawed. Twice as many pipes taking volume from front to rear, temperature lost on the rearward journey due to a much larger external surface area of two pipes Vs. one and then too much volume to be manipulated on the forward pass.

    I believe the whole concept behind Rear Mount was to reduce hassle and cost, by going to 2 turbos you've just doubled the hassle and cost of doing the cheap and easy installation.

    I spent 5 years building my twin turbo 928, it would have been soooo much easier to have gone rear mount or single front mount, but no, my classic learning had been that a pair of smaller turbos mounted as close to the pistons as possible would give the best response. It wasn't easy, but if it was, everyone would do it.

    There is a good reason manufacturers have gone to the "hot V" concept.
    " Racing cars don't have doors. Toilets have doors" : Keke Rosberg

  11. #41
    Registered User TurbostyleR's Avatar
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    Quote Originally Posted by lukevl View Post
    Rear turbo early-bird commos represent!
    Your mate with the rear mounted turbos, is his name Steve by any chance?
    A man can never step into the same river twice. Because, it's not the same river, it's not the same man.

  12. #42
    Registered User lukevl's Avatar
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    Quote Originally Posted by TurbostyleR View Post
    Your mate with the rear mounted turbos, is his name Steve by any chance?
    Sure is

  13. #43
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    Former member of Boost cruising "OSK race fabrications" ?

  14. #44
    Registered User lukevl's Avatar
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    The one and only. Although not a friend now I know he was on boost cruising

  15. #45
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    lol. wow that build was going on back then. must be almost 15 years in now?

  16. #46
    Unregistered User Permit Roadsailing's Avatar
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    Quote Originally Posted by Roy928tt View Post
    Ah, I reckon twin rear mounts are fatally flawed. Twice as many pipes taking volume from front to rear, temperature lost on the rearward journey due to a much larger external surface area of two pipes Vs. one and then too much volume to be manipulated on the forward pass.

    I believe the whole concept behind Rear Mount was to reduce hassle and cost, by going to 2 turbos you've just doubled the hassle and cost of doing the cheap and easy installation.
    For the same cross sectional area and wall thickness two tubes will be ~40% heavier than one too. I would assume that two smaller turbos would carry a similar mass penalty over one big one too. If packaging and ground clearance is a problem two of everything might be the only way to go though.

    I don't like the idea of rear mount turbos at all, but if packaging dictates it I suppose a rear mount turbo is better than no turbo.
    Last edited by Roadsailing; 21-01-19 at 09:37 AM.

  17. #47
    Littering and....?
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    Quote Originally Posted by JZK25 View Post
    G25 660's, mah homie.
    Too small you reckon?

  18. #48
    Registered User lukevl's Avatar
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    Quote Originally Posted by psi999 View Post
    lol. wow that build was going on back then. must be almost 15 years in now?
    Yep about 15 years. Motivation has stalled but it's so close. I'm trying to get him to finish the last hurdle so he can drive it

  19. #49
    Registered User JZK25's Avatar
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    Quote Originally Posted by Rhys View Post
    Too small you reckon?
    Nah not really. Be responsive. I have a pair also, nice looking kit.
    David Fraser - Automotive Historian!

    Quote Originally Posted by bigmuz View Post
    You can't polish a turd but you can put 600hp in it and laugh your fucking arse off coming past someone sideways at Powercruise.

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