Mini with Suzuki swift engine, injection problem.
Turbo Mini Forums

Hi Guys,

Not an a series but i know there are some very knowledgeable people on here regarding injection.

I've got a Suzuki swift GTI engine 1.3 16v. after running for a year on bike carbs i decided to go to fuel injection for better drivablity and economy. I'm using the stock injection system but controlled by a megasquirt MS2 ECU and a Innovate Wideband lambda sensor.

It pulls fine in all gears apart from 5th. get to 4200rpm and it just will not increase revs, foot planted and nothing just bobs around that rpm. Now that sort of rpm in 5th is just over 90mph, however on the bike carbs it would run to 110-115mph with out too much trouble.
If it drop it in to 4th it will pull passed 4200 without any trouble and accelerate past 90.

Im new to injection and still finding my feet however my gut feeling is that its a issue with the tuning at high loads. looking at the ignition map I've got about 35-39 degs and the wideband is telling me i'm running at an AFR of 11-12 so there fuel.

Any ideas?

Thanks

Far far to much advance in there at those reves and high load.

Considering it's a 16v head, id be expecting more like 28 degrees across the top line, 32 at the most.

Take out some of that near the top line and feather in the rest of the map and see where you go from there

Heres my map

What's you rev limit set to ? The map is only up to 6K so anything beyond that will flatline.

I agree with Colin's initial thoughts but, looking at the map, the top two lines aren't bad, but I would say the middle right needs some work.

As they would always say on the MS-E forums, how about an msq and msl to look at.

How are you reading the AFRs, through the MS2 or just from an independant display (having it logged in the MS2 would obviously help).

Schrödinger's cat - so which one am I ???

Rev limit is set at 7000 hard limit.
The AFR is piped in to the ECU and logged though that but it the innvote gauge MTXL (somthing like that) mounted in the dash so i can keep an eye on it.
I'll do another data log on my way home.
the problem only seems to be in high gear but my route home is mainly motorway. Pulls like a train in 5th from 2500 all the way to 4000 then won't go anymore.
Would be fine but i like being quicker than the New MINI's.

You say you are using the stock injection system. What does that consist of? ITBs, Plenum ??

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

What were you using for ignition when you were running carbs?

And, have you checked to see if the trigger wheel is acurately set for 'TDC'?

Injection system: Plenum chamber, original injectors and fuel rail, MPI fuel pump, Ford coil pack, 36-1 trigger wheel.
Yeah the TDC and trigger wheel have all been checked. Its all spot on.
When i was on carbs i used a mega jolts and the same coil pack, crank sensor etc.

I've done a log and looking back though the graph its hard to know what to look for.

I would suggest you post your msq and msl on the MS-E forum.

You could attach them here and a few of us could have a look but you will get a lot more experience on the MS-E forum and the knowlegable members respond very quickly.

Schrödinger's cat - so which one am I ???

I'm no expert, but I would have thought that if you ran the same ignition map as you were on carbs, and you had no problems with the carbs, then the problem lies with the fuelling?