Mjlj - tps or map ???
Turbo Mini Forums

hi folks.....
can anybody throw some light on the pro's and cons of both types of system ?
i have just recieved my Mjli fully assemblebled with tps..... my flywheel is off for machining & ive started playing with the software/mapping....
iv'e read on this forum & others that tps is not the way to go & that map is much better.......
i ordered a tps version as it looked a bit easier to set up........ did i do the right thing ????

i meant Crank pulley not flywheel ...............Doh!

MAP is better for forced induction and road driven (linked port / manifold runner) engines.

TPS is useful for wild cams and 1 throttle per cylinder instals (ie. throttle bodies).

So for a Mini running a turbo, pair of SU's, single SU, single Webber or throttle bodies then MAP will probalby work out better for you. Split webers (unlinked mainolf runners) or throttle bodies (in which case MegaSquirt is better .. or at least will be soon hopefully) you are probably better off with TPS build ... (you can always link the manifold runners together with small bore pipes with orifces in (to limit pulse transfer from port to port) and run MAP there too.

I think you will see my preference ... LOL

Every day is a school day ...........

How fast and how expensive ...... the same question...

For a turbo motor MAP is best.

As you will see in the EBAY items for sale there is a TPS MJ for sale.

Edited by colas on 10th Jan, 2007.

Dam roger you beat me to it by 17 seconds. LOL

Not normally my propblem ..... honestly ... who have you been speaking too .... she's a liar!!!

LOL

Edited by RogerM on 10th Jan, 2007.

Every day is a school day ...........

How fast and how expensive ...... the same question...

MAP is best in theory; but TPS does work very well.

Put it this way - a perfectly set-up TPS is better than a poorly set-up MAP system.

I'm using TPS on mine, and I'm not about to change it.

Hi,
Dave .. How would a TPS work for engine load on a forced inducion system as it can't compensate for boost, or have I missed something?
Cheers,
Gavin :)

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Huh? I have TPS and crank, with a map sensor as a compensation.

Am I now realising that MJ has no throttle pot at all on the MAP system????

yes, its either only TPS or only MAP

just dusting off my MegaSquirt... is the MSquirt a TPS OR MAP system too, as the TPS bracket was causing me hair loss trying to design and fit one.

I am more into VEMS, but I THINK the squirt has provision for both at the same time

MS2 uses throttle position and MAP together, useful for light throttle under boost conditions. Not sure about MS1 though as I have only ever run those alpha-n (TPS and revs only) on cars with a throttle per cylinder.

Every day is a school day ...........

How fast and how expensive ...... the same question...

Yup its basic TD - but its cheap as chips!

Alex

AlexF

Oh yeah - I wasn't dissing it. For the money, it's well worth it I guess. And is a big step-up from a dizzy....

So you're running it on all your minis then? The Racer? The gary Glitter one? etc?

Edited by TurboDave16V on 10th Jan, 2007.

So ideally you want to run TPS with Map compensation?

Something i've been playing with on mine thats all. it will be going back on the rollers soon thats all.

Ideally - you want to run Map vs RPM with TPS compensation...

But TPS vs RPM with Map Compensation will get you a lot of the way there. It is difficult (impossible?) to get perfect for every load/rpm state however. DON'T jump on the bandwagon of folks who've never even tried it, and just say it's "shit, useless, crap, worthless, no better than a carb, etc"... I have tried it, I have run it, and for where I'm at - it's plenty good enough.

StevieTurbo will hopefully give some input here, as i recall he used to have RPM/TPS (map comp) and switched to RPM/MAP (tps comp) with his current DTA system.
I suspect the issue was more fuelling related however - but hopefully someone who has seen the benefits first hand will give some genuine input...

I honestly haven't spent time developing systems on dyno's to know enough to comment much more... My experience is also limited to a small range of engines. I know when to hand the baton of knowledge to someone else who we all can learn from...

Edited by TurboDave16V on 10th Jan, 2007.

Yes I run it on mine... not that any are on the road at the moment!

Blended MAP/TPS is availble on MS.

Alex

AlexF