I'm part way through building a G40 turbo engine, but frustratingly i didnt get a G40 throttle body when i brought the motor. Just been browsing through another post in the engine section regarding a turbo conversion, and Andy mentioned something about using the GT throttle body and plastic elbow instead. Just wondering if this is a viable option?

I cant see why not, just wondering if anyone can think of a potential problem?

Cheers

Depends what management you're intending to use- GT one can be adapted to run with digifant

Depends what management you're intending to use- GT one can be adapted to run with digifant

I'll be using G40 management with a PSD turbo chip. Are there differences between the throttle potentiometers on the GT/G40 throttle bodies?

the GT throttle body has a throttle potentiometer on it but the G40 throttle body just has an idle switch and a full throttle switch on it, no pot. You'll need to fix two micro switches to the GT TB to make it work with digipants. Aftermarket ECU is easier because you can use the throttle pot

Cant afford an aftermarket management system at the moment so could be very tricky. anyone got a spare G40 tb they wanna sell?

Cant afford an aftermarket management system at the moment so could be very tricky. anyone got a spare G40 tb they wanna sell?

The advantage of the GT throttle body is the 2nd inlet (it has two butterflys) so the total inlet area is much bigger. On a G40 there is only one inlet. The GT and G40 manifolds both have the cut out where the second inlet goes; on a G40 it just gets covered over. You just need to add a microswitch for full throttle and one for idle position to the GT TB and it will connect up to the G40 Digifant fine. A guy called Mark Hunter successfully modified a GT TB like this for his G40 turbo conversion. He was one of the first in the UK to turbo a G40 engine (last century!). He was also one of the first to melt his engine.

Cant afford an aftermarket management system at the moment so could be very tricky. anyone got a spare G40 tb they wanna sell?

The advantage of the GT throttle body is the 2nd inlet (it has two butterflys) so the total inlet area is much bigger. On a G40 there is only one inlet. The GT and G40 manifolds both have the cut out where the second inlet goes; on a G40 it just gets covered over. You just need to add a microswitch for full throttle and one for idle position to the GT TB and it will connect up to the G40 Digifant fine. A guy called Mark Hunter successfully modified a GT TB like this for his G40 turbo conversion. He was one of the first in the UK to turbo a G40 engine (last century!). He was also one of the first to melt his engine.

There where meltages before mark's- but not as well documented. Although he does get the credit for building and running the first G40 turbo over here (all be it for 600miles ).

First G40 meltdown I had was in 1997

Information is so much more accessible these days due to the internet.

I had no idea at the time that the fuel pumps were different on MPi/SPi so I just ran the standard Genesis pump on my conversion. Ran fine in standard tune.

One chip and pulley, and six hours later = engine death at 125mph

Cant afford an aftermarket management system at the moment so could be very tricky. anyone got a spare G40 tb they wanna sell?

The advantage of the GT throttle body is the 2nd inlet (it has two butterflys) so the total inlet area is much bigger. On a G40 there is only one inlet. The GT and G40 manifolds both have the cut out where the second inlet goes; on a G40 it just gets covered over. You just need to add a microswitch for full throttle and one for idle position to the GT TB and it will connect up to the G40 Digifant fine. A guy called Mark Hunter successfully modified a GT TB like this for his G40 turbo conversion. He was one of the first in the UK to turbo a G40 engine (last century!). He was also one of the first to melt his engine.

Mark used an NZ throttle body - pretty much identical to the GT, but already comes with an idle switch fitted. He then used a pressure switch for a full throttle switch - Digiants responds much better to running a turbo motor that way.