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  1. #1
    casual poster MR 355T's Avatar
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    Default Hyd roller 355 turbo build

    Hey guys, longtime lurker first time poster.
    I'm in the process of collecting parts for a turbo 355 build to go into my 2nd gen commodore.
    I have recently picked up some engine components off another guy that abandoned his project and So far i have a vt block converted to Neo seal with 3 middle caps 4 bolted, grouted to welsh plugs, scat crank and 5.7 scat h beams, powerbond race balancer, camtech hyd roller cam 244/248 114 lsa and .600 lift. Also have a gtx4294 turbo with 1.01 t4 rear for the project.

    I want around/at least 700bhp on 98 with room to move with e85 but not sure exactly how realistic this is. I'm really just trying to build a Holden v8 street car that can hold its own at powercruise ect and can play/upset some of the boosted ls brigade and pump fuel BBC stuff as this is the sort of stuff my mates are running.

    I have a feeling that I MAY be slightly small on the turbo compressor side (I'm happy to run it initially and see how it goes) and also think the cam may be possibly leaving some mid range on the table in the turbo configuration? id like to keep the convertor as tight as possible for street duties which this cam may not lend itself well to? I want to run around 9:1 comp as to keep it decent while off boost as well.

    I guess I'm just looking for some insight Into the combo from guys that have been there and done it. I have read just about every turbo 355 thread In Existence and spoken to zok a little on Facebook but I dont think it can hurt to bring the discussion up again and see if there's any new ideas/experience to draw from.
    I thank anyone that that contributes to this discussion in advance as I know this topic of checking people's combos pops up quite frequently. Thanks guys.


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  2. #2
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    Turbo is good, bang on almost - GTX4294 is good for 1000hp or thereabouts, the GTX series makes boost earlier than the old GT4294 - A customer that races a 2J had a GT4294 on it making a tad over 1000hp on E85, we switched it to a GTX45 - boost response was near identical with the larger turbo & power went up to around 1300hp with only 2psi more boost (36psi in it now - he's run up to 42psi, but can't get it down on the 1/8 mile tracks he runs on).

    Bottom end also sounds good, 9:1 will work nice - you can run on 98 with 15-16psi in it & make your 700hp no problem, switch to E85 for racing & the combo should be capable of 800-900hp.

    Cam is a bit on the big side - fear not, it can be reground at a fraction of the cost of a new one, exact specs will need to wait until heads are finalised.

    You'll most likely need around 3000rpm stall - you want to talk to slingshot converters, for a boosted V8 converter they're hard to beat, just be aware the converter may need to be reworked once the combo is all sorted - very hard to get a turbo converter right 1st time.

    All up you're on the right track.
    I'm not on here much any more - don't bother PM'ing me, chances are I won't read it, just call me on 08 8376 9540 if you need to get hold of me or email knight28@optusnet.com.au, phone is better!

  3. #3
    254RWHP boat anchor EVL253's Avatar
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    sounds similair to a combo a mate is putting together. he got a gtx45 turbo for it. it rocked up at work the other day n fk me its huge! he did have a vortech setup on his 304 that was big enough for the 355 but sold it.
    its getting the pipework started soon
    11 second E85 bottle fed boat anchor

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    that cam is more suited for a blower
    a dam good set of heads
    really good oiling
    your tune has to be exceptional
    what ecu are you running if it's the old delco i would prob reconsider that decision
    intercooler would be high on the priority list as well as a wicked radiator and water pump
    a custom piston will be good investment and you will need to adjust the design to suite your application get the top ring down as far as you can get it anodized ring lands if you can afford it
    steel top ring napier second with a high tension oil ring
    and finally an oil cooler will help too
    and engine like this for racing is one thing and totally another for power cruise you need to over engineer it as much as you can for it to have a chance to live
    ONE STOP MOTORSPORT SHOP - engine building and development - tuning and complete fuel systems-- latest dyno dynamics dyno --click the link to see our facebook page https://www.facebook.com/pages/Zok-R...9505334?ref=hl

  5. #5
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    Watching as can't decide on s400 or gtx4294

  6. #6
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    He doesn't need custom pistons, or monster heads, heads should be sized for the engine capacity & rpm, the fact that it'll be boosted does not make much difference to port sizing or flow requirements.

    I made 600hp @ 5700 rpm with 308 cubes, stock A9L rods, stock crank, cast pistons, early heads, a baby hyd flat cam, a pair of ancient T3's on cast manifolds running 13psi, all tuned with an ancient microtech LT8 running batch fire.
    I beat on it like I wanted to kill it & it never died, came apart looking pretty much the same as when I put it together.

    You don't need to turn a turbo motor hard, so you don't need exotic parts/mods - let the boost make the power & tune the thing safe, it'll live no problem.
    I'm not on here much any more - don't bother PM'ing me, chances are I won't read it, just call me on 08 8376 9540 if you need to get hold of me or email knight28@optusnet.com.au, phone is better!

  7. #7
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    Quote Originally Posted by TK383 View Post
    He doesn't need custom pistons, or monster heads, heads should be sized for the engine capacity & rpm, the fact that it'll be boosted does not make much difference to port sizing or flow requirements.

    I made 600hp @ 5700 rpm with 308 cubes, stock A9L rods, stock crank, cast pistons, early heads, a baby hyd flat cam, a pair of ancient T3's on cast manifolds running 13psi, all tuned with an ancient microtech LT8 running batch fire.
    I beat on it like I wanted to kill it & it never died, came apart looking pretty much the same as when I put it together.

    You don't need to turn a turbo motor hard, so you don't need exotic parts/mods - let the boost make the power & tune the thing safe, it'll live no problem.
    600 hp to 700 plus is not a small step up
    not needing big heads maybe but thats not how i do it
    as for not needing exotic parts well for what he wants to use the car for i think he should over engineer it
    this thing will get raped make it tough if you want it to live a long life
    ONE STOP MOTORSPORT SHOP - engine building and development - tuning and complete fuel systems-- latest dyno dynamics dyno --click the link to see our facebook page https://www.facebook.com/pages/Zok-R...9505334?ref=hl

  8. #8
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    There's tough & then there's overkill - overkill costs a bunch for no good reason.

    Sit down with pipemax & have a look at what is actually required for a 355 turning 6000rpm max - which is all he will need for 700hp if it's done right.
    Turbo is soft on parts, as is lower rpm - those Scat rods will do the job just fine, as will a set of off the shelf slugs - a little more pin clearance & good pins is cheap insurance tho, CP can do this with shelf part numbers for a few bucks extra, much cheaper than customs.
    The Scat crank is a bit of a worry tho - crankshaft rebuilders nodular iron would be my choice.

    MR355T - you're in perth right? - look up Boz race engines, Paul is a stand up bloke & can help you out with machining etc, for tuning hit me up & I'll recommend a tuner & some base settings.
    I'm not on here much any more - don't bother PM'ing me, chances are I won't read it, just call me on 08 8376 9540 if you need to get hold of me or email knight28@optusnet.com.au, phone is better!

  9. #9
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    tk i know what it takes to make over 700 ponies
    ONE STOP MOTORSPORT SHOP - engine building and development - tuning and complete fuel systems-- latest dyno dynamics dyno --click the link to see our facebook page https://www.facebook.com/pages/Zok-R...9505334?ref=hl

  10. #10
    casual poster MR 355T's Avatar
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    Thanks for the response fellas. It's appreciated.
    Yes I'm located in Bunbury which is 1.5 hrs from perth. No one will touch my lawn mower in Bunbury let alone a performance engine. All engine work will be carried out by people recommended in perth.

    In regards to the scat crankshaft. I had the same thoughts also, I have a harrop crank with 10/10 off mains and big ends and another set of scat h beam rods with new bearings to suit that are left over from another build here. May be an option to get the crank machined to suit Neo seal and use that?

    Turbo setup will be fabricated by myself using tubular steam pipe manifolds with 4into1 collectors ect so will be as good as it gets in that regard.
    I have morel tie bar lifters to use as. They should be upto the task.

    Ecu will be purchased once I can find someone I can trust to tune the combo and will use whichever ecu they prefer. being in wa limits this a lot.
    Will definitely hit you up for tuner recomendations tk. This has been my main concern being over here.



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  11. #11
    Part of the furniture prozb's Avatar
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    Quote Originally Posted by zok race carbs View Post
    that cam is more suited for a blower
    a dam good set of heads
    really good oiling
    your tune has to be exceptional
    what ecu are you running if it's the old delco i would prob reconsider that decision
    intercooler would be high on the priority list as well as a wicked radiator and water pump
    a custom piston will be good investment and you will need to adjust the design to suite your application get the top ring down as far as you can get it anodized ring lands if you can afford it
    steel top ring napier second with a high tension oil ring
    and finally an oil cooler will help too
    and engine like this for racing is one thing and totally another for power cruise you need to over engineer it as much as you can for it to have a chance to live
    You dribble the tech talk zok, but many an engine has lived a healthy life with none of the above!!! OP none of this is necessary at 700-800hp.
    10.31@135.01 Stock stroke 377 SBC street car

  12. #12
    Part of the furniture prozb's Avatar
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    Quote Originally Posted by TK383 View Post
    There's tough & then there's overkill - overkill costs a bunch for no good reason.

    Sit down with pipemax & have a look at what is actually required for a 355 turning 6000rpm max - which is all he will need for 700hp if it's done right.
    Turbo is soft on parts, as is lower rpm - those Scat rods will do the job just fine, as will a set of off the shelf slugs - a little more pin clearance & good pins is cheap insurance tho, CP can do this with shelf part numbers for a few bucks extra, much cheaper than customs.
    The Scat crank is a bit of a worry tho - crankshaft rebuilders nodular iron would be my choice.

    MR355T - you're in perth right? - look up Boz race engines, Paul is a stand up bloke & can help you out with machining etc, for tuning hit me up & I'll recommend a tuner & some base settings.
    TK, those 9000 series cranks are a decent peice. Mine is making 620 apsirated and turns 7500 no probs. Turbo at 700 hp should be fine as a streeter. A forged unit when upping the hp and some 1/4 mile play is a diff story.
    10.31@135.01 Stock stroke 377 SBC street car

  13. #13
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    Yeah, the scat crank is probably ok, but I'd still prefer to see a csr crank in it.
    Busted crank makes a mess.

    That being said if I was building it for myself I'd use one lol.

  14. #14
    casual poster MR 355T's Avatar
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    Tried replying earlier but Tapatalk crashed I think.

    Anyway, thanks a lot for the response fellas.

    Yes TK, I'm located 1.5 hrs from Perth and that's where I'll be going for any work that I can't do myself.

    CRANK- my thoughts were much the same with the crankshaft, I have a used harrop crank here with 10 off mains and big ends. Could get it checked out again and machine it to suit Neo seal and use that? Have new acl bearings, also used scat h beams to go with it as well. It's from a previous combo. Main reason I have the scat gear is because it came with the block.

    ECU- will be decided upon when I find a tuner comfortable with and will use whatever he prefers. Something compatible with a flex sensor would be ideal as I'd like to use both ethanol and pump fuel with out draining tank and changing tunes.

    Will definitely be interested in the hookup with base tune and recomendations on a tuner over here to use TK.

    I will be fabricating the turbo setup in its entirety and utilising steam pipe tubular manifolds with good collectors ect so will be as good as it gets in that side of things.

    There are a few turbo holdens over this way. Ive seen some of them perform and they make around the low-mid 500 rwhp mark usually, I'm wanting something that performs better than what I've seen so far.






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  15. #15
    casual poster MR 355T's Avatar
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    It may be worth selling both cranks and rods and going csr or come billet. I'd rather not have to do things twice. a mates motor lunched itself at powercruise just gone and i dont want that happening to me. I also want to be able to lean on it and give it a hard time without worrying.

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