7 replies to this topic

[cooperpooper]

hello everyone!
18 year old here with a 1999 Japan spec SPI mini.
I’m wanting to build a speeduino and put it into my car so I can teach myself how to tune a car and later on have more options and flexibility with mods.
The car is completely stock right now and my idea would be to wire the speeduino with the same connectors as the stock ecu so it could go back to stock if needed. Similar to the SC Delta 400.
My question is if this is something that would even work? and if would it be worth it?
I’ve been researching for weeks and think I have a pretty good understanding of everything. I’m just not sure if the speeduino would work with the stock sensors, injector, loom, etc.
Thanks!
Felix

[Avtovaz]

hi!

 

i dont know about the Mini exactly, but i recon its very similar to the Rover 100 that i have in many ways. My car has a mgf 1800cc engine with a 1100cc flywheel on it. I have just googled your flywheel, it looks like the same trigger pattern as mine. Speeduino has several rover mems trigger patterns in its software already. 

 

My car runs all factory default sensors, apart from the lambda which is a 14point7 wideband. Have a look for WTMtrinics website in US, it was cheaper for me to buy from the Uk from Weaver than to buy from a UK seller. I have the ua4c unit. works really well but if your doing plug and play, get another ecu, take the inside out of it, and get the tail harness and solder on, or chop the loom, put a multiplug in, then you can swap back to the rover ecu if you need. 

 

the spi unit is quite a low fuel pressure injection system, it spits the fuel onto a hot plate that helps it get sucked off from. Lots of people get scared of this, but it works really well. You wont be able to go for the mpi inlet by the way, its far too complicated to program in the software. If you need a bigger inlet get a spi unit from a Lada 21217 niva and adapt it to fit. 

 

 

For the money, you simply not beat speeduino its taught me alot about how efi works. good luck ;)

[cooperpooper]

ok, thanks so much. so I should be able to use the factory crank position senser then? 

 

what would be stopping me from using the factory lambda sensor? 

 

great idea with the multiplug! hadn't thought of that

 

whats the reason you went with a ua4c unit compared to say the v0.4.x?

[Avtovaz]

the lambda, there is 2 types, wide band, and narrow band, the mini has narrow. So if it has a tune in the ecu, the narrow can check to see whats going on but only in a limited way. The wide band lets you sniff what ever is comming out of the engine. 

 

You will be able to use the standard crank sensor yes. 

 

Ua4c was what i saw on Weavers site, and just bought it when i was having a drink ;) Cheers by the way ;)

[cooperpooper]

ah ok for some reason i thought the mini already had a wideband.
thank you very much that helps a lot!

[Steve220]

ah ok for some reason i thought the mini already had a wideband.
thank you very much that helps a lot!

Only very modern cars have widebands. You'll need the sensor and driver, then wire the driver into the ecu and scale it. The ecu will then be able read your AFR.

You'll also need to find the scaling for the oem sensors as it will rely on them for fuel correction tables within the map.

[cooperpooper]

ok, so really it’d just be a matter of calibrating all the sensors? is there a certain method for scaling them?

[Steve220]

Yeh, you find the resistance data vs temperature and input it into the ecu 👍🏽