Welcome to our guide for fitting an upgraded 52mm Throttle Body to your
MGF/TF. If you have a MGF Trophy or a TF160 or 135, you will already have a 52mm
throttle body fitted. If you don't have one of these and are thinking about
getting one I would highly recommend one. While there is no discernable power
gain from this mod there is certainly a great improvement in throttle response.
It makes a great partner to most, if not all, of the after market induction kits
available for the F/TF.
Thanks to Al for letting me (Phil Brindley) loose on his pride and joy for this article.
1 x 8mm ratchet spanner
1 x 8mm socket, extension and ratchet
1 x 10mm ratchet spanner
With the cover out of the way you should have clear access to both sides of the throttle body.
|4. Unclip the throttle cable from the gold coloured bracket (a). Manually open the throttle body up fully and bring the throttle cable around the black plastic cam. Once free you should be able to slot the cable out of it's housing (b) and free of the throttle body altogether.|
|5. From the boot side you should now be able to loosen the jubilee clip holding the air filter to throttle body connecting pipe. Once loose, gently remove the pipe from the throttle body. (If you have a K&N kit fitted you should be able to get this well out of the way, however with the Vader it is easier to leave it in in situ and work around it)|
|6. From the engine bay side, disconnect the 2 rubber breather hoses and the electrical connector.|
7. You can now remove the 4 x 8mm bolts holding
the throttle body to the plenum. Use whichever
of the 8mm ratchet type tools you think fits the
application best. I used the ratchet spanner for
the top two and the socket and extension for the
8. You should now be able to remove the throttle
9. Take your shiny new throttle body and offer
it up to the plenum. Locate the 8mm bolts and
hand tighten. Once you are happy that the TB is
sitting nice and square, tighten the bolts
fully. (Remember to tighten opposite corners in
10. Relocate the two breather pipes and the
electrical connector to the engine bay side of
11. Relocate the air filter connector pipe and
tighten the jubilee clip.
12. Slot the Throttle cable back into it's
housing, open the TB up manually and feed cable
around the throttle cam. Clip the cable back
into place on the gold bracket. If you notice
some slack in the throttle cable you can unclip
again from the gold bracket and use the treaded
clip to adjust the cable position, obviously the
reverse is also applicable if the cable looks to
tight. To fine tune you should start the engine
and use the engine revs at idle to get the cable
13. Spend the next 15 mins getting the engine
bay cover back on, positioning soundproofing and
carpet and generally messing around trying to
get the rear of the hood clipped back into place
properly (I always hate that bit).
|14. Cross your fingers and start the car.|
If you notice that the car is idling higher that usual once warmed up then
you may need to reset the stepper motor. This is done by simply switching the
ignition to position II (without the engine running). Depress the throttle pedal
fully 5 times in 5 seconds. Switch the ignition to position 0. Start car as
normal. If you still find that the car is Idling high you may need to visit your
local MG service centre and get the to adjust the TB using a test book.
So there you have it. Throttle Body fitting made simple. Check back soon for more "How To's". So from me it's... How, for now! (showing my age there).