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  • batoutofhull ·
    Hey Martijn,
    I am glad yours works well. I really appreciate your input and experience. When I get a 52mm tb I will put it in and reset. If it plays up I can put the 48 back in. It will be ok I'm sure.

    On another note I approached a scrap yard/car breaker who informed me they have a rover 62mm throttle. This made me laugh. I have never seen one of those! some how I think it would be a bit
    batoutofhull ·
    Hi Martijn,
    Rodger Parker in his mgf restoration book - talks about setting the throttle stop. How did you set the throttle stop on your TF? Engine idle will be fluctuating too much to set it. A T4 machine is advised, to help with set up. I have not got access to one of these.
    Also I read somewhere that the 52mm tb is on a 160 zr as well. I will find out this week if all goes to plan.

    Regards Rich
    batoutofhull ·
    Thanks Martin,

    After cleaning and using a magnifying glass I still can not see the type of throttle I have. I can see the TV but the seam from the injection moulding of the TB is obscuring the 1 or 5. I am guessing it is a tv1 throttle though.
    I am interested in the fact you did not change the throttle position sensor. My plan is to use the existing one on my car and swap it for the one on the new throttle. I think I have found a tv5 52mm throttle from a rover MG zr. It might be set up differently? Did you buy new or used with yours?

    A new air box is a good idea. I have been looking for an airbox for a while with two openings and hoses.

    Thanks again
    regards Rich
    LeRoi50 ·

    Fitting it is do able without removing the engine cover....but fiddly.
    Especially the lower bold to the front, it also holds a bracket.

    On identifying, on the top edge at the plenum side there is a vague printing in the alloy.
    If it says TV1 it is a 48mm, if TV5 it already is a 52mm. The 115 has a 48 mm standard.

    I didn't replace the TPS, if you are sure it is okay then you don't need to change it.
    Resetting it is straight forward, key in position 2 (no dash lights on) press the throttle 5 times from top to bottom within 15 seconds and turn off the ignition and wait 30 seconds minimum.

    Performance/feel is improved. It reacts more direct and seems to have more "breath".
    All in all a improvement worth doing. Also a Pipercross panel filter in a TF135 airbox is a good investment. The 115 has a airbox with only one intake at the back. The 135 has two intakes, you then can put the front one to the side intake vent.

    Hope this helps.


    batoutofhull ·
    Hi LeRoi50,

    I am a tf 115 owner. How did you get on with the fitting of the 52mm throttle body to your car?
    I am thinking of fitting one. (My T.B. is alloy and looks like a 52mm). It has no branding on it at all. I bought the car, new in 2004.

    Did you swap your old stepper motor for the new one? Also have you had your tf connected to Test book?

    Many thanks for any advice you can give me.

    Kind regards Rich
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