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1293 Turbo Engine


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#76 mini13

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Posted 04 June 2019 - 07:31 AM

I like the ARP's as they have the little allen head in the middle of the stud, so you can pull them out easier so you can slide the head forward for removal without pulling out all the car/turbo assy.



#77 Anthony30

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Posted 16 August 2019 - 10:07 PM

So the slowest project in history continues...

 

12G940 fast road/trackday cylinder head from turbo phil. great job and service.  :highfive:

 

68364928_1264097943771662_18493314979625

69122372_1264097900438333_38677890412859

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#78 Anthony30

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Posted 08 October 2019 - 01:11 AM

So, I've been debating about the gearbox recently. Think I'm now going for a heavy duty helical 5 speed gearset with a quaife atb diff. I really just want a 5th gear to bring the revs down on the motorway, with the advantage of running a 3.1 diff to make it fun around town. I'll be buying a few bits and bobs around the big purchases to keep the project moving forward.



#79 mini13

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Posted 08 October 2019 - 09:14 AM

yeah Phil is good isnt he!

 

gearbox is a tricky one, as all the available " strong" gearsets have a 2.5:1 first, which can be a bit tall, especially for 2.9 FD's, I see the apeal of the 5th, but not sure about its strength. Also i found a 3.1 4 speed fine for cruising on the motor way, 75mph at 4k.



#80 Steve220

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Posted 08 October 2019 - 09:59 AM

It'll be great until the turbo starts to spool. I'd rather have a solid 4 speed and take the 4k cruising RPM than the risk of it being a box of parts after a thrashing. You kept bleating on about the 4 speed Evo helical by minispares, I'd stick with that idea; they're proven to be strong if you're going to run pub figures.


Edited by Steve220, 08 October 2019 - 10:00 AM.


#81 Anthony30

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Posted 08 October 2019 - 09:45 PM

Mini13 - very happy with the head. should flow a lot more than the standard turbo head. :) As both of you mentioned, It's the strength of the 5TH gear that's questionable. :/ Then again, even the minispares 4 speed heavy duty helical is relatively unproven on turbo engines. minispares state It's good for a 16v, but with the added torque of a turbo it might be the final nail in the coffin.  :lol: Then again, I would rather rebuild the engine every 10, and not listen to the constant annoying whine. It's truly horrific. Just hearing the noise on Youtube is bad enough, so being inside the car for a few miles must be a nightmare.  O_O  Steve220, yep I do keep going on about it. I seriously overthink about every part going into the engine. :tumble:  :shy: The gearbox is a major pain in my arse. It's definitely getting a Quaife ATB diff, but the rest of the spec my head is up my arse about. All I want is a quiet gearbox that will put the power down without spitting it's dummy out, and last more that 10k.  :ohno: I loved the standard 998 gearbox, with a 3.1 F/D/R, if I remember rightly. It worked with the engine so well, but this is a 1293 turbo, so completely different.

 

(Walk to the fridge and get yourself a cold beer after reading this, you deserve it). O_O  :D



#82 mini13

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Posted 09 October 2019 - 08:38 AM

Atb is great, really made a difference in my car,

 

Yeah, im curios about the strength of the helical kit, Im sure the gearkit is plenty strong enough, its the sideloading effects on the case I'm concerned about. Im sure it'll be fine in most cases, but ones your past about 200hp, doing drag starts who knows eh!



#83 hazpalmer14

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Posted 09 October 2019 - 10:37 AM

Atb is great, really made a difference in my car,

 

Yeah, im curios about the strength of the helical kit, Im sure the gearkit is plenty strong enough, its the sideloading effects on the case I'm concerned about. Im sure it'll be fine in most cases, but ones your past about 200hp, doing drag starts who knows eh!

 

Colin is the only person I know of using one so far. And he is running 200+ ponies, only time will tell I guess.



#84 Steve220

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Posted 09 October 2019 - 10:57 AM

Out of curiosity, sideloading within the standard casing - where is the weak point that gives way due to the load? I'm trying to avoid straight cut like the plague, and at 150lbft of torque so far, my box is coping well. But then again, I don't launch it..at all.

#85 mini13

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Posted 09 October 2019 - 12:45 PM

good question, we all know of the 3vs 4 bolt main carier section where they are prone to cracking, also some people have managed to push the whole diff assy out the back of the box, to be honest neither of those really sound like sideloading issues, but I do wonder if movenement in the case causes the gears to go ut of ailignment and put stress on the teeth, obviously a SC kit wouldnt eaperience that as much. it would need a much clevererer chap than I to research that though.



#86 Steve220

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Posted 09 October 2019 - 03:06 PM

good question, we all know of the 3vs 4 bolt main carier section where they are prone to cracking, also some people have managed to push the whole diff assy out the back of the box, to be honest neither of those really sound like sideloading issues, but I do wonder if movenement in the case causes the gears to go ut of ailignment and put stress on the teeth, obviously a SC kit wouldnt eaperience that as much. it would need a much clevererer chap than I to research that though.


I find it all intriguing! I've seen many different ways that gearboxes self detonate, but guess the limitation is it was never designed to put the power through it that some of us make!




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