Speed Six & AJP8 TPS possible alternative

[Modrich]

So after experiencing an issue with high idle speed with a warm engine (1700-2400rpm) which could point to dodgy throttle POTs/TPS sensors I noticed that 'Mr Nice Guy' has just found a potential alternative to the OEM ford white and blue sensors.

He has succesfully fitted these to his rebuilt AJP8:

https://raceworks.com.au/sensors/throttle-position...

The sensor seems to be a Wabash 971 available as OEM fitment with connector built-in (971-0001) and with bare wires (971-0002) see below, Radward also list a few different variations of the 971:

https://www.radward.co.uk/wabash/oem-971-0001

https://www.radward.co.uk/wabash/971-0002-08680

A couple of companies sell them with what appears to be the correct connector already fitted for about £75:

https://www.webcon.co.uk/products/10391-universal-...

https://gradient-engineering.com/product/throttle-...

I've managed to source 4 971-0002 remaining stock from German ebay, should be arriving next week.

A word of caution, Mr Nice Guy had to adjust the mounting hole positions to get this sensor to the correct 0-100% reading in the ECU of his AJP8, but there is no hole adjustment on the Speed Six throttle body, there is a few degrees rotation on the 971-0002 mounting holes though. The idea of using these is hopefully they are better quality than the alternative sensors available...

I will report back my findings when i've managed to trial fit them.

[s6boy]

Excellent. Looking forward to this.

Surely it been asked before but why didn't TVR just fit one pot between the 2 banks

Edited by s6boy on Friday 18th April 08:10

[Granturadriver]

It is excellent how you always familiarise yourself with new issues and then share your findings with us here. Thank you very much! I look forward to your further reports!

[Modrich]

Thanks GT, it's important to open up topics on this sort of thing, there's always someone out there with more knowledge that can help progress a potential solution...

[Basil Brush]

I only had a quick google of the ones he'd used on the video.

Based on your info, they are listed as in stock here in the UK for £66 each as well.

https://kitspares.co.uk/products/tps-sensor-for-th...

[Modrich]

Thanks BB, it might be best for most to get the ones from webcon for £75 with the plug already fitted. I managed to get 4 from Germany without plugs for £120, unfortunately the last they had, not arrived yet. Plugs ordered separately.

[Modrich]

The good news is, the throttle pots arrived after being stuck in customs from Germany, the bad news is they'll need an adapter to make them work as a replacement for the blue throttle pots, the other good news is that the offset adapter plate is quite easy to make and I've made and have it fitted and set-up correctly...

Correct plug fitted to the Wabash 971/0002 TPS. The TPS feels very solid and has some weight to it compared to the cheaper copy blue TPS I removed so hopefully it is more reliable/better quality...


Offset adapter plate and TPS fitted






Throttle % matches cylinders 4, 5, 6


As it turns out, it was a waste of time ordering the TPS from Germany as they can be purchased for the same price from Radward.co.uk but you'll need to fit a plug. Otherwise order from the links above with plugs fitted.

The good thing about this TPS is it should be compatible with the white TPS on the opposite end of the throttle bodies without an adapter plate. I will test it when I get around to removing my throttle bodies to have the bushes/bearings fitted and do a general refurb.

Edited by Modrich on Sunday 4th May 21:10