WHICH TPS FOR M20 TURBO???

[ross2009]

hey guys just putting a few bits together half way through doing my m20 turbo and getting to the little bits
now i know you need a linear tps for ms ive got ms2 v3.0
this week end i picked up a m50/m52 tps which i heard would work
but today when i just tried it on a throttle housing it only goes on backward so the plug is in the opposite direction to the original
will this work?
or is there some thing else out there that would be a better fit? eg pointing the right direction lol

thanks in advance

[stonesie]

The TPS for an automatic car has both the potentiometer and the normal 2 switches in a box in one unit, although you will need to get some wiring and the plug with it as it is a round 6 pin.

[Gunni]

The E36 one is the simplest one. Check the E30tech forum for more informations.

[ross2009]

Ok cool thanks for that gunni I just got a tps of what I think was a m50 m52 engine but it locates on the throttle housing backward so the plug is undernieth the housing does the e36 one point in the same direction as the standard one?
Thanks

[Gunni]

Now I can´t remember

I used a volvo tps last time.
You should be able to find pics on e30tech. Try and look for the tps adapter plate somebody made. That has to have pics

[ross2009]

It's alright I've sorted it I did read some treads on e30tech and what I found was they take the butterfly and shaft ou. And spin it 180 degrees so that the d shaft is the other way simple really I used an old tps cut it to bits so it just left the two old screw slots and screwed the m50 one to it works a charm

[Ant]

Good call.

switchable auto gives better resolution though, always makes more data on the raw ADC count than an M50 unit.

no an issue when only using to trigger acel enrich , but when I did a couple of AlphaN on MS M20's thay were quantifiably better with more TPS res.

[ross2009]

ant you could be talking mongolian for all the words i under stood there lol

[toby]

If I understand correctly, what I think it amounts to is that the switchable auto tps gives a better analogue to digital count with higher resolution - and works, in effect, like a more finely graduated and sensitive volume control on a stereo.

If the M50 tps is only used to take readings as a trigger for acceleration enrichment then its lower resolution is fine. But if the MS is set up without an air sensor (MAF/MAP) and works only on readings taken from throttle position and rpm (AlphaN) then the lower resolution of the M50 tps isn't as good as the other, more sensitive tps.

The switchable auto one is the more sensitive tps. The throttle position reading from it is more accurate. With more accurate throttle position readings (also finely graduated and sensitive)- it is possible to make the tuning more accurate.

So the best tps for the job depends on the set up you are using. Are you using an air sensor?

http://www.bayareamotorsport.com/alphan.html

[ross2009]

that sort of makes sence yes i am gonna use a iat sensor or is that not the same thing?

[toby]

Intake air temperature (IAT) sensor yes. Which sort, MAF from E36?

[ross2009]

the sensor ive got is actually from a 20v turbo mk 4 golf that my bro had lying around our work shop so i nicked the sensor

[toby]

Is it just a sensor on its own or incorporated into a housing like the hot wire sensor in a MAF?

[ross2009]

its just the sensor on its own

[HairyScreech]

are you fitting a MAF from an e36 etc or a e30 style AFM? if so dont worry about it, if not then use the auto one.

[ross2009]

No mate I'm not going to use a Maf of any sort just a ait sensor ,
wot about idle control valves you do away withthem running ms don't ya??

[toby]

MS can run the idle control valve, if you want, I've heard. Or you can discard the valve.

[ross2009]

Any pros or cons with or with out the idle control valve?

[toby]

Well apart from the obvious - better idle is a plus, more setting up and research a minus - I wouldn't know any more than that. You've checked out the MS forum?

[ross2009]

Yeah I mean I haven't got to that point yet so will look more in to that nearer the time I've gotta finish the motor first

[toby]

Well good luck with it anyway. What are you finishing - bodywork or engine?

[ross2009]

Both really half way through painting the body and half way through the engine complete fresh bottom end crank done new bearing all round new rings just gotta get a new oil pump core plugs a few more gaskets and the engine is near enough done
I would put a couple of pics up but don't know how

[toby]

Well if you can't master http://photobucket.com/ I would advise you to leave megasquirt well alone

[ross2009]

Ha tbh I don't come on here much I'll have a look see if I can stick some pics up cheers

[ross2009]

I'm tryin to do it on my phone but uploaded some pics and took the page dunno if it's right but here goes
http://m924.photobucket.com/albums/Ross ... giAVvvs%3D

god that's long lol

[toby]

Mmmm shiny.

[ross2009]

Lol it's getting there slowly I've gotta pull my finger out and get it done can't wait to drive it for the first time with a blown lump

[E30_Crazy]

Did you piece together your turbo setup, or did you buy a kit? I find that most are kinda flimsy/unreliable in appearance. And I've been told to stay away from them. I might have found one, but it's $$$$.

What have you done so far, and would you mind sharing your costs/suppliers?

Thanks!

[ross2009]

Hi mate yeah I've put every thing together my self and brought bits I wouldn't buy a kit coz half of it you wouldn't use pm me you email addy and I'll write things down