MegaJolt on a mini with Weber 45

MiniMark · Post by **MiniMark** » Mon Feb 19, 2007 8:55 pm

I am thinking about converting to Megajolt and i'm not sure whether to go for MAP sensor or TPS.

I have a 1380, weber 45, 296 cam and i'm not sure if that would give uneven pressure for the MAP sensor.

I would prefer to use MAP as it's easier to set up.

Thanks,
Mark.

Post by **brentp** » Tue Feb 20, 2007 4:05 am

Hi Mark,

Sounds like you've read the MAP vs. TPS topic http://www.autosportlabs.net/index.php? ... MAP_or_TPS ?

Sounds like you might be right at the edge with the cams you're running. Is your idle very lumpy or uneven? You could also check with the manufacturer of those cams to see what they might think about the vacuum stability at idle.

Another option is to create a large vacuum reservoir to smooth the pulses from each runner, and then reference the MAP sensor from that reservoir.

MartinM · Post by **MartinM** » Tue Feb 20, 2007 8:42 am

This works very well - there's an empty in-line fuel filter in the vacuum pipe to the MJLJ as well

...ahhh, easy posting of pics in the new forum. Nice

Gilesy998 · Post by **Gilesy998** » Tue Feb 20, 2007 9:55 am

brentp wrote:Another option is to create a large vacuum reservoir to smooth the pulses from each runner, and then reference the MAP sensor from that reservoir.

Exactly what I'd suggest. THIS enclosure should be fine. Fit three bulkhead connections to this and run a hose from each inlet runner to the box, then one from the box to the MJLJ. The box then becomes an accumulator to dampen the vac signal as the MAP sensor sees it.

HOWEVER I know of a guy that was running a Weber on his 1293 Mini with 11-1 CR and a Kent 310AGSP cam with the simple tee-peice setup shown above.

MartinM · Post by **MartinM** » Tue Feb 20, 2007 2:58 pm

Ahh, the joys of the RS web site with it's Broadvision session Ids

Got a part number for that enclosure?

Gilesy998 · Post by **Gilesy998** » Tue Feb 20, 2007 4:19 pm

364-2203

Interesting adjustable top steady you've got there.

MartinM · Post by **MartinM** » Wed Feb 21, 2007 8:49 am

It's a stage rally car, but as it's not mine, I don't have any particular views on the top mount - but it looks pretty strong to me!

Gilesy998 · Post by **Gilesy998** » Wed Feb 21, 2007 10:30 am

MartinM wrote:It's a stage rally car, but as it's not mine, I don't have any particular views on the top mount - but it looks pretty strong to me!

Mr. Jones's stage car I beleive

MartinM · Post by **MartinM** » Wed Feb 21, 2007 11:15 am

Exactly that

MartinM · Post by **MartinM** » Wed Feb 21, 2007 11:25 am

..and without his specific permission (but I'm sure it's OK) here's a pic of it in its class-winning, MJLJ-powered, outing on a recent national rally in the UK

Brent - maybe there's an opportunity for a forum section for gratuitous pics of MJLJ-powered vehicles in action

Post by **brentp** » Thu Feb 22, 2007 7:01 pm

Love the picture!

Hmm.. maybe I'll rename "Installation / success stories" to "Powered by MJLJ gallery"