2020 Jimny tuning

On a NA petrol engine like the Jimny's, any gains from a remap will be small and at the top end of the rev range. Rather than spend £££ on a re-map, surely it's better to learn to live with the high revving engine and utilise the performance you've already paid for? If you're scared of damaging the engine, be reassured that Suzuki warranty it to be used however you wish! However they will not honour the warranty if somebody else has fiddled with the computer.

l am not worried about revving the engine, but it seems almost a bit held back at lower RPM, as if it's being stifled by emissions regulations.
My KTM Duke was like that, l fitted a small fuelling box that gave a slightly richer mixture (around 3% l believe)
The bike was no faster but so much smoother at low RPM
Modern petrol engines often run a leaner than is ideal mixture to get past emissions and l wondered if the Jimny was the same.

I called in to one of the Tuning Shops today and asked if they do Suzuki mods. "No" was the answer.
I was looking for a change to the Alternator/Regulator Voltage Control Computer. He did send me next door to the Auto Electrician, who confirmed there is nothing he can do for me with the electronics. He does sell Lithium Dual Battery/Redarc systems.

lightning wrote: l am not worried about revving the engine, but it seems almost a bit held back at lower RPM, as if it's being stifled by emissions regulations.
My KTM Duke was like that, l fitted a small fuelling box that gave a slightly richer mixture (around 3% l believe)
The bike was no faster but so much smoother at low RPM
Modern petrol engines often run a leaner than is ideal mixture to get past emissions and l wondered if the Jimny was the same.

I've found this company: www.quantumtuning.co.uk/car-remap-tuning...e=Suzuki&range=Jimny

I know nothing about them. But they claim 10hp gains from a remap. I'm not sure you'll really that amount more, but a remap would allow anything funky Suzuki have programmed in for emissions control for Type Approval. So I do believe gains can be had.

Personally I've not found the Jimny to be poor at low rpm. It is a small naturally aspirated petrol engine, so it will never be a torque monster. But it will happily pull from 1500rpm in top, maybe even slightly lower revs when on the level.

Really though, to get the performance, you need to use the power band and the gearbox.

If low rpm performance is your desire, then a larger displacement engine and/or boost are the only answers really.

In terms of remaps. My concern would be voiding the warranty on such a new vehicle. But this may not be a concern for yourself.

I'm sure the Jimny's engine would respond to other n/a tuning techniques too, such as a better exhaust system, less restrictive intake or even a cam swap or ported heads. Most should see improvements everywhere, but as a trend, to get more n/a power, you usually move the power curve to the left, i.e. higher rpm use.

An alternative would maybe look at re-gearing. Shorter gearing would keep you higher in the rev band for normal driving. And therefore give you more performance for a given speed in a given gear than you'd have with the stock gearing. Downsides would be, more buzzy engine, potentially lower cruising speeds and a drop in mpg. But if you aren't doing high speed motorway work, this may not matter at all, and may well suit buzzing around country lanes at sub 60mph speeds.

Yes the ecu can be tuned there is a video on youtube of a phillipino guy getting one tuned dident get much more out of it maybe 10 hp and fixed a dead patch in the torque curve. I believe the ecu is the same as gsxr 1000 bike they must use the same ecu in a few models. If your after more power that can be noticed you would need a turbo or supercharger. In Australia there are a few options that are not to expensive AVO turbo world has a jimny turbo kit also Trust greedy do a kit for RHD only around the 6k AUD mark the Supercharger option is around 10K with an after market piggy back ECU anyway hope this helps

warrengti wrote: I believe the ecu is the same as gsxr 1000 bike they must use the same ecu in a few models.

It won't be the same ECU. It might run similar software or a similar interface. But what it will be controlling and why would be vastly different...

Before racing off and doing any ECU mods, I scoured the internet for firsthand experiences. Those that have actually taken the plunge. Found this post and a couple more posts/youtube videos (no dyno figures, just I feel - both in support of and against). After reading this thread, I was pretty convinced it was a waste of time and money. In the end, I made multiple mods. 

The reality is that the ECU remap alone can indeed give you gains in excess of 10hp, dyno tested, actually a bit more than that (12.8hp). Can you make those changes with the regulations enforced in your country, probably not. If, however, emissions control is not an issue or as stringent, then the very emissions controls enforced by the ECU do allow for gains in excess of 10hp. In as far as torque gains, air filter and exhaust give the greatest gains. Probably still less emissions that a large diesel 4x4.

Some asked, why more power is required. If you use the Gen 4 on the open road, unladen at altitude, say 5000ft, it can't hold 100-120kph (bring on the metric) as the gradient increase, say past 4-5%. So, those looking for more power aren't looking to drag race, not even challenge a Vespa, they simply want the car to be usable on the open road. Possibly more a problem in non-EU countries where we have long undulating open roads and speed limits between 100 and 120kph on these roads. One would have expected this to be achievable out the box, certainly was with the Gen 3. 

My final dyno figures are now representative of what one would expect of a modern 1.5 NA engine (84.7KW/164NM). My driving experience and "seat of pants" assessment concurs. Just exceedingly frustrating that I had to go to these extremes, the engine should have been correctly matched to the vehicle out the box with all emissions controls in place.

Side note, recall seeing a query on this post about the Jimny possibly running leaner for emissions reasons. It is the opposite, the Gen 3 did, the Gen 4 doesn't, on the rich side (the experience on mine - visibly and based on the exhaust gas measurements on the dyno and the experience of the tuner in general with the Gen 4 - at least at a bit of altitude). Note, air/fuel ratio was not tampered with during remap, just monitored. Considering I now have better fuel consumption, my effective emissions may actually be more favourable.

Hope this is of help to others, who like myself, wanted insight from firsthand owner experiences. 

 

daxiet wrote:

Note, air/fuel ratio was not tampered with during remap, just monitored. Considering I now have better fuel consumption, my effective emissions may actually be more favourable.
 

I can't help but wonder if I am missing something - maybe misreading or misunderstanding something - if the air/fuel ratio was not "tampered with" during the remap, where has the additional power come from, where has the better fuel consumption come from?

10% more power at the same time as better fuel consumption would be every man's dream, but doing it without tampering with air/fuel ratios, something does not add up - it's theoretically possible to get more power by changing the valve timing, if I'm not mistaken the K15b has dual VVTi and the ECU can vary the timing and therefore the overlap, but more power generally requires more air & fuel and that means the fuel consumption increases.

daxiet wrote:

Some asked, why more power is required. If you use the Gen 4 on the open road, unladen at altitude, say 5000ft, it can't hold 100-120kph (bring on the metric) as the gradient increase, say past 4-5%. So, those looking for more power aren't looking to drag race, not even challenge a Vespa, they simply want the car to be usable on the open road. Possibly more a problem in non-EU countries where we have long undulating open roads and speed limits between 100 and 120kph on these roads. One would have expected this to be achievable out the box, certainly was with the Gen 3. 

 

More power is never more than a gear change away, unless you're already down into 3rd gear in those situations? And are you suggesting the 100hp Gen 4 is slower than an 85hp Gen 3?

It also doesn't really make sense how you say the remap gave more power, but the intake/exhaust mods gave more torque. An engine that can breathe more easily will make more power and more torque. The remap simply programmes the ECU to take advantage of this.