chip/remapping

is it possible/worth buying a chip or remapping or what ever its called, to either help the jimmy's power as I do alot of towing, or at least slightly better mpg?

has any one done it or know any thing about it?

Found this a whlie back, proracing.co/en-gb/montage/petrol-lpg?op...&select_item_654=658

I've heard you can squeeze 10bhp extra out of the Jimny but it would need a proper remap, there is no such thing a magic plug in box (sry JimnyJack) they just trick the ECU in to thinking there is more air in the inlet, or push another parameter off to make the ECU dump more fuel it.

More fuel doesn't equal more power without more air in, and more air out! Plus these engines are fitted with Lambda sensors so the ECU will spot the over fuelling and just gradually trim the fuel back into line, if the fuel trim gets over a set value, the MIL lamp will come on and throw up a code.

Easiest thing you can do to increase power would be to remove your CAT, and upgrade your air filter. You might need your CAT back for MOT emissions so quick release is ideal - the older jimnys only have 1 lambda as they dont monitor emissions so it wouldn't thow up the MIL light due to high emissions (and the emissions might be acceptable without the CAT anyway)

If your considering spending a few bob on a remap, you'd want to do the above first, to whatever budget you have, then the tuner can make the most of the extra intake/exhaust ability.

Perhaps also worth mentioning/clarifying,

If somehow you get more air in to the combustion chamber the lambda will sense it is "lean" and automatically add more fuel short term, and gradually change the long term map to suit, so there may be no need to "remap" things, just give it a few hundred miles. ECU's will usually operate quite far off the base map without flagging up any errors or warnings.

Simply fitting a big exhaust and fat inlet pipes isn't the answer, you need a laminar air flow to achieve best results and that means the *right* size and shape. Another factor is that you get high pressure pulsing in an exhaust and inlet manifold, this is something Suzuki had been aware of since long before the Jimny came about. Bigger doesn't equal better and the size and shape of everything that's already there is in sync to within reasonable manufacturing costs.

Trust the manufacturer, they're pretty smart! If it were as simple as plugging in some tatty little plastic box, don't you think they'd have done it already to better the competition?

Remove the oil breather from you airbox (clutching at straws, it wont really do much for performance but its just dirty!) do not blank it off of you'll probably blow a seal out, red bull cans work well as catch tanks. Remove the CAT, and upgrade your air filter (keep the standard air box, it lowers the interstitial velocity so dust and crap drops out rather than blinding the filter, so your healthy air intake capacity, stays health without maintenance - good for a road car)

I've gone on far to much, but hopefully demonstrated there is a lot more at work than a little black box, sure there are cost and quality (same thing?) related things, as well as the most obvious emissions chokes but really, not something a bit of plastic will aid.

It's all fun.

Most of the gains that you get on a N/A engine are from timing changes. Changing the base fuel map is usually only done in the high load areas and the fuel trims have no effect because you're in open loop, stock Suzuki ECUs are usually quite rich under load so adding more fuel doesn't help. You're not going to gain a lot and you'll struggle to find someone who can remap a petrol Jimny.
Those chips above are a con, there is a way to remap some Jimnys via the diagnostic socket but it can't be done while driving and it needs a mod on the PCB.

The cheapest way to get more power in a Jimny is an engine swap to a 1.6.