TPS to MAP with V4..

Quicksilver · Post by **Quicksilver** » Wed Oct 01, 2008 1:56 pm

Hi all,

Does anyone know if the "MJLJ V3 MAP conversion kit" (http://www.autosportlabs.com/mjlj-conversion-p-45.html) would be compatible with the V4?

Regards,

Quicksilver.

Post by **brentp** » Wed Oct 01, 2008 2:42 pm

No- it's specifically for the V3 kit, as it includes components appropriate for the V3 board- including through-hole resistors, capacitors, bulkhead fitting and a short length of vacuum hose.

Do you need to convert a V4 unit to MAP sensor operation?

If so, we have added the V4 equivalent MAP conversion kit to the online store:
http://www.autosportlabs.com/mjlj-conversion-p-50.html

Thank you,

Quicksilver · Post by **Quicksilver** » Wed Oct 01, 2008 11:01 pm

Brent, you are a gentleman and a scholar.

Thank you.

Quicksilver.

Dhutch · Post by **Dhutch** » Thu Mar 05, 2009 2:26 pm

If i bought a system currently used for MAP, what would i need to convert it to TPS. Other than the actuall TPS itself?

- Would that be a simular cost to converting from TPS to MAP, or can the V3/V4 megajolt always support TPS with MAP being an addition.

Also, how can you tell a V3 from a V4 and what are the performance/operational changes between them?

Daniel

Post by **brentp** » Thu Mar 05, 2009 5:19 pm

Hello,

The MAP sensor and TPS share the same input; so only one can be used at a time.

To convert from MAP to TPS you would need to disable / remove the MAP sensor. The easiest is to disable it by removing sensor by removing R4, right next to pin 1 of the sensor.

Here are the TPS components you need, located in a convenient box on the board:

We've also added it to our online store in case you wish to proceed with the conversion:

http://www.autosportlabs.com/mjlj-conversion-p-53.html

It's easy to distinguish a V4 from a V3. The V3 is physically larger with a smooth-surfaced case. The V4 looks like what is currently on the front page of our website.

The V4 adds an auxiliary input for reading an extra sensor, such as a temperature sensor for tuning warm-up advance. It's also more compact and rugged due to it's construction. For the primary feature of controlling ignition advance, they are identical.

I hope this helps,

Dhutch · Post by **Dhutch** » Thu Mar 05, 2009 5:40 pm

Yes, sorry, i didnt mean to suggest it could do both.
- Ive just been looking at various second hand options as well as the kits, some of which are obvisouly MAP, others of which are TPS.
- I also currently dont exactly know which i want for my application (1.9 cvh on four sidedraugh dellorto 40's) but with currently unknown cam.

Daniel

Post by **brentp** » Thu Mar 05, 2009 5:54 pm

No worries- it was a reflexive response.

If you can get a stable vacuum reading, MAP sensing is generally considered to be superior as it more closely measures the actual load on the engine. However, TPS still works fine- if installed in this configuration you'll be completely happy!

A 2nd hand V3 or V4 would work great for you. Good luck!