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where are we at with G Turbo manifolds?


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Hi everyone, 

I'm seeing posts about group buys from Alunox but they are all from a good few years ago - what is the current situation on manifold replacements - and, is the recommendation to replace the entire system?

Jaap

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@MarkKassim is the man in the know :thumbsup:

88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport

Evora NA

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For the original, SJ has them in stock. Spoke with Steve when I was there last month. Reproductions. 

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See he also has a conversion kit to use a later manifold and turbo.   Seems pretty good value.

I always surprised that nobody has reproduced the main wastegate casting, which can corrode very heavily.

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  • Gold FFM

I had one from SJ installed a couple of months ago. Seems OK to me.

Old one was pretty knackered - but I suppose it was 40 years old! (Possibly)

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  • 2 weeks later...
On 19/07/2022 at 15:52, 910Esprit said:

See he also has a conversion kit to use a later manifold and turbo.   Seems pretty good value.

I always surprised that nobody has reproduced the main wastegate casting, which can corrode very heavily.

I don't think it makes sense in many ways. When I tried to fix my wastegate about 17 years ago, I could only find NOS diaphragms that were going for something like $400USD. 

I think it would make more sense to replace the wastegate with a manifold that would accept a modern wastegate without any modification to the stock exhaust. I actually retapped the existing manifold and was able to install a modern wastegate (I added a block off plate to the outlet on the manifold), and I was going to have a shop build the pipe from the wastegate back to the exhaust, but I never got any further than that. I ended up buying and installing an entire Alunox system (manifold back), which is probably the better (but more expensive) way to go. 

1997 Jeep XJ | 1983 Lotus Turbo Esprit

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My understanding is that it deletes both the external wastegate and the adapter manifold, which allows the use of a 'modern' turbo with an integral wastegate.

Regarding 2nd quote - That's my point.  If the main wastegate casting was reproduced it would allow G car owners to fully service the existing external wastegate to new condition, as all other wearing parts are available in the UK.   

Edited by 910Esprit
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