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Thread: 304 Twin turbo?

  1. #1
    casual poster TIMMEH's Avatar
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    Default 304 Twin turbo?

    I was looking for twin turbo kits for my VN motor today went to KKR website as people are using them on the LS1. Not foumd any kits as yet, but the turbo's used in the LS1 kit the KKR330 are only $719. each. These turbo's are making 600rwhp on the LS1.
    So as i am a boiler maker im thinkin two turbo's, a Mig, some flanges cut on the profile at work, a heap of pipe and bends, a lot of time and swearing, i could near do it myself.

    I would hope to utilise the harrop single plane i aready have and use a blow through carby system.

    Can anyone tell me if the harrop manifold will work for this setup or are the long runners not suited to this application?

    Was hopeing to leave my bottom end fairly original just add good low comp pistons, bolts, and stud kit.
    How far could i push it? Will it handle the boost?
    I have a really good top end so hopeing i wont have to run too much boost to make decent power.

    Any advice greatly appreciated.


    http://www.otomoto.com.au/kkrturbo.htm
    Last edited by TIMMEH; 09-02-2007 at 11:21 AM.

  2. #2
    Senior Member ferret's Avatar
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    2 GT25's will work great or 1 T04E. They will give ya a size reference for when ya go shopping for snails.

    in theory the intake manifold shouldn't make much difference cause the air fuel is being forced in.

    I have been told from those in the know that on a 308.....
    3psi = noticable difference
    5psi = great power increase
    8psi and up = spastic and good fun.

    those figures were for a stock 308 with forged pistons.

    Hope that helps

  3. #3
    casual poster TIMMEH's Avatar
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    Mmmmm spastic and good fun.... Now thats what i want! Thanks ferret, yeah the turbo's had 25 somewhere in their description i think. That was what he recommended anyway.

    Ferret, i rang a performance shop today just trying to find out more, price on GT25's $1500. each and he recomended GT28's which are $1700 each, is that right? Big difference!

    Also anyone know how i can work out what size outlets i need to get the right flow?
    Last edited by TIMMEH; 09-02-2007 at 12:35 PM.

  4. #4
    Power Crazy ProStreet427TT's Avatar
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    This is a little different but my friends VT Berlina 5L Holden V8 is a stock 2 bolt main engine, forged pistons, COME intake, MSD, had std heads, no rollers etc. His made 350rwkw @ 13psi with a Vortech. He has now had the heads ported & flowed, O ringed the heads, fitted screw in studs, guideplates & roller rockers... cost him $10k to freshen up & do this work. It only gained 10rwkw.
    With forced induction there isnt a need to do head work.
    I would say go twin Master Power GT28's, good for 350hp each, they are internally wastegated & will do whatever you want to do.
    I know it's all a money thing but I would steer clear of blow-thru, it went out with the ark. Use a Holley quad throttle body with injection & you'll never have any problems. Turbo's & carbs aren't a good thing together according to Kenny Duttweiler, that's why we have injection.
    I'm using twin Master Power T-70 on my 427sbc.
    www.frantik.co.nz This is the NZ Master Power agent. These turbo's are far cheaper than Garrett by about 50% & the internals are interchangeable with Garrett.
    Last edited by ProStreet427TT; 09-02-2007 at 12:46 PM.
    Twin turbos speak louder than words.
    2992hp 2377ft/lb @ 20psi on 93 pump
    4002hp 2977ft/lb @ 34psi on C16

  5. #5
    casual poster TIMMEH's Avatar
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    Quote Originally Posted by ProStreet427TT
    This is a little different but my friends VT Berlina 5L Holden V8 is a stock 2 bolt main engine, forged pistons, COME intake, MSD, had std heads, no rollers etc. His made 350rwkw @ 13psi with a Vortech. He has now had the heads ported & flowed, O ringed the heads, fitted screw in studs, guideplates & roller rockers... cost him $10k to freshen up & do this work. It only gained 10rwkw.
    With forced induction there isnt a need to do head work.
    I would say go twin Master Power GT28's, good for 350hp each, they are internally wastegated & will do whatever you want to do.
    I know it's all a money thing but I would steer clear of blow-thru, it went out with the ark. Use a Holley quad throttle body with injection & you'll have no problems. Turbo's & carbs aren't a good thing together according to Kenny Duttweiler.
    I'm using twin Master Power T-70 on my 427sbc.

    Thats some good power out of the relatively stock engine. He would be using a intercooler for 13psi yeah?

  6. #6
    Power Crazy ProStreet427TT's Avatar
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    Yes sorry, it's intercooled.
    It's annoying that no one makes a kit for the Holden V8.
    Last edited by ProStreet427TT; 09-02-2007 at 01:34 PM.
    Twin turbos speak louder than words.
    2992hp 2377ft/lb @ 20psi on 93 pump
    4002hp 2977ft/lb @ 34psi on C16

  7. #7
    casual poster TIMMEH's Avatar
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    Quote Originally Posted by ProStreet427TT
    Yes sorry, it's intercooled.
    So the master power GT28 should be about the same price as the KKR330? Any idea how i can work out what A.R size i should use? The garret has more options for A.R size aswell.

  8. #8
    Power Crazy ProStreet427TT's Avatar
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    I just rang him & he told me:
    Twin GT28 with a T3 housing & .63 A/R will be enough for 500rwhp
    He will sell them to you for AUD$900 ea delivered to your door.
    Last edited by ProStreet427TT; 09-02-2007 at 01:44 PM.
    Twin turbos speak louder than words.
    2992hp 2377ft/lb @ 20psi on 93 pump
    4002hp 2977ft/lb @ 34psi on C16

  9. #9
    casual poster TIMMEH's Avatar
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    Looking like this could be an affordable approach. Is it a wast of time to go with a blow through setup, or just not as efficiant?

  10. #10
    Senior Member ferret's Avatar
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    I am going blow thru on my 253 powered gemini. Dunno give me a few months and I'll tell ya what it like.

    oh yeah the garrets are dearer cause they have ball bearing turbos, bushed are heaps cheaper and as long as you change the oil regulary then ya wont have an issue.

  11. #11
    Power Crazy ProStreet427TT's Avatar
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    Nowhere near as efficient & it's not really the best. A carb wont increase the fuel amount needed when the boost is rising. At least with EFI & an ECU it adjusts itself to the requirement of the engine. A carb wont do this, you'll probably end up with rich down low to allow the right amount of fuel up top.
    These turbos have a floating journal bearing & 360 degree thrusts & not all Garretts are roller bearing, only if you stipulate that's what you want.
    There is a roller bearing option for these at an extra cost of course.
    Last edited by ProStreet427TT; 09-02-2007 at 02:18 PM.
    Twin turbos speak louder than words.
    2992hp 2377ft/lb @ 20psi on 93 pump
    4002hp 2977ft/lb @ 34psi on C16

  12. #12
    Senior Member ferret's Avatar
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    in my experience with garret you'll get roller unless ya ask for bushed. Ahh wel not important any way.

  13. #13
    Power Crazy ProStreet427TT's Avatar
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    Quote Originally Posted by ferret
    in my experience with garret you'll get roller unless ya ask for bushed. Ahh wel not important any way.
    Oh ok, I've never dealt with them because of the price alone.
    Twin turbos speak louder than words.
    2992hp 2377ft/lb @ 20psi on 93 pump
    4002hp 2977ft/lb @ 34psi on C16

  14. #14
    casual poster TIMMEH's Avatar
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    Just rang commwreck and can get computer, wiring for $300. or standard manifold and the lot for $500 do you think the standard manifold could be used? what fuel rails do you use with a harrop manifold?
    Last edited by TIMMEH; 09-02-2007 at 02:47 PM.

  15. #15
    Power Crazy ProStreet427TT's Avatar
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    Yes you could use all the standard stuff, it would be fine. You would have to get someone to modify your Harrop & you can buy fuel rail blanks & make them.
    The original Holden stuff would be your cheapest option I would imagine.
    The std manifolds are crap for N/A but when it comes to blowing through them it doesnt matter.
    Oliver just rang me back & explained that with the .63 A/R they will spool up pretty quick.
    The other option is a single T-61 or T-64 but you need an external w/g.
    A friend of mine is looking at fitting a single T-64 to his VR Senator.
    My opinion though is if you have 2 cylinder heads you should have 2 turbo's... it just looks better I reckon.
    Last edited by ProStreet427TT; 09-02-2007 at 03:06 PM.
    Twin turbos speak louder than words.
    2992hp 2377ft/lb @ 20psi on 93 pump
    4002hp 2977ft/lb @ 34psi on C16

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