MJ mapping N/A
Turbo Mini Forums

I hope someone can help, decided to change the standard dizzy on my mini to MJ with TPS.

The reason for TPS is that I am running a 45 Weber and BP270 cam with 1.5 roller tip rockers so has a little lumpy bottom end. The engine has a compression of around 185 psi per cylinder; I am unsure of how to calculate this it to a ratio but if someone would like to assist it would be gratefully appreciated. (standard stroke / +60 overbore on a 1275cc)

It is my intension to build a replacement engine but with a 286SP and 1.5 roller tip rockers.
My question is I can find many maps but they are all Mass Air Pressure, can I change the values of the MAS (Kpa) to TPS (0-90) on the load scale or has someone got a map for a similar engine spec as below using TPS until it on a rolling road.

Engine Spec:
1340cc (unknown CR)
BP270 Cam
1.5 roller tip rockers
Stage 2 head
45 Weber

Cheers

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile

Been looking for maps with TPS but to no avail.

So going to change to MAP, look at autolabs and found all the parts required to change MJ to MAP at farrnells for around £15.

Seems simple enough to do, 2x caps, 1 resistor and MAP sensor.

This will also give me the opertunity to force induction later, it's seems no matter how much I try, I always end up back looking a turbos.

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile

there is not many users running tps on here, those that do are likely to be well strung engines and expertly set up

i have converted one from map to tps before, its straight forward enough if you need a hand you know where i am

Yes i moved to the darkside

Instagram @jdm_brett

Been looking at it over the course of the week seems simple enough but for the sake of £15 going to convert MJ to map and then that opens the window to future mods

Prob do a post on the mod as cant seem to find one anywhere, thanks or he offer with maps.

You don't have a picture of your VR bracket do you?

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile

ill have a dig about, if you pm tom fenton he may still have some, he supplies some mint stainless ones

there we go best i have on file

Attachments:

27.96kb

Edited by Brett on 7th Dec, 2012.

Yes i moved to the darkside

Instagram @jdm_brett

Hey, if you go to MAP, I could send you a few maps to give you an idea/ starting point.
Some of mine wont be a million miles off your spec other than I run bike carbs rather than a 45
I mapped mine on a rolling road and its fairly simple once you get going.

PM me if you want any more info, even just for a look.

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile

if you get a TomF bracket it wont work with a weld on 36-1 ring

Yes i moved to the darkside

Instagram @jdm_brett

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile

Looks like I now have all the parts to convert to MJ.
Just waiting for Tom to post pulley and bracket in new year, cheers again Tom.
My only question now is as I'm running a 45 weber with no take off for the MAP, I know I need to run vacuum tubes fron both inlets are these ok to just be T'd together before he MJ or do they have to go to a small chamber to create a sort of mini manifold.

I have read of both ways but no one has said if either one is better.

Attachments:

135.26kb

192.08kb

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile

Lee,

For a NA engine with a reasonably hot cam in then MAP will be useless no matter what you do, you need to rig it up TPS and then map the ECU to suit. The reason a lot of lads on here use MAP is that we need the density compensation for boost. But using MAP to sense load in your application will be shite I am afraid. Maybe not what you want to hear but TPS will be the better option for you.

Didn't Madmk1 run TPS on his old weber setup?

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile

To be honest running a map you have found on the net is just asking for trouble, get it running on the megajolt, then take it to a rolling road that knows what they are doing.

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile

Hi there Mate, I had run my weber with a TPS, as for a base map, I just loaded the 1380ccMAP, map that was on the disk you get with the MJ, then I drove to minispeed under 40mph all the way JOB DONE!

I have started posting on Instagram also my name on there is turbomk1golf

Nothing is impossible it just costs more and takes longer.

The advice on the autosport labs website if using map would be to put an inline box to help equal out the signal. A bloke in our local club used a small plastic fuel filter as it was about the correct size. His engine did work well but then he was a flat out or nothing kind of driver.

Good luck, once you go mj and get it mapped you won't go back

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile

TPS is used by all the NA 16v guys since they tend to use ITBs and fairly hot cams. I know when I tried to get a decent MAP signal from mine, I gave up and tuned for TPS, it was the ony way.

I would tend to have the bottom 50% of the map for up to 25% throttle, and then the top 50% of the map for the rest with 90% throttle on the top line, since throttle movement between 90 and 100% has little effect.

That means cruse area is around the center of the map at around 25% throttle, with the bottom two rows for idle and the top two rows for full throttle, everything else falls intoplace

You have probably seen the maps on Autosport labs but at least here is a link for future people finding this thread looking for different maps for their set-up being it NA or charged:

[url] http://www.autosportlabs.org/viewforum.php...cdays=0&start=0[/url]

Dazed and Confused....

Hi all, it seems that there are mixing feelings on weather to go TPS OR MAP.
Done plenty of research on autosportslabs and forums and decided to go for MAP, I've now converted my MJ to MAP. nice and easy job just remove R3 from the TPS section and fit the MAP / capacitors and resister to the MAP section.
If I do experience issues can always revert back if required, but thinking of building a turbo next and to be honest I don't think the BP270 cam should cause much issues as going to fit a 80cc chamber too dampen the signal.

Going to copy my current dizzy advance curve to be on the save side, before it goes to the rolling road to be mapped properly. I know this will only be 2D (no vacuum used) but should get me going.

Can always drop maps in and try but think this is best done on RR, keep you posted on progress.

Thanks again for all the help, should start fitting MJ in January, where's the best rolling roads for setting MJ up, local one is minisport but willing to travel and make the mini a trailer queen for a day.

What the mind can conceive the mini can achieve
MITP 2012 17.01 seconds 1/4 mile against "The Don"
MITP 2013 16.83 seconds 1/4 mile