23 replies to this topic

[Avtovaz]

Has anyone got a microsquirt running on a mini with the factory manifold?

 

Im having thoughts of injecting my 998, and using microsquirt. It would either be, spi inlet, mpi inlet, or a home made inlet with a clio spi on it. The question is with mpi, how do you sort the charge robbing the fuel, can that be done with microsquirt, and also with the spi, is that just easier?

 

The clio inlet idea is i may use a clio ecu, the guy local with the RR is a renault specialist, and i recon he will be able to tune the clio system for me if its viable to fit it. My Bmw rally car with the m44 engine ran factory ecu but with a remapped chip in it that was done on the RR...

 

 

Just thinking out loud as although id love to keep the mini all factory, i like the reliability idea of fuel injection and rev limiters etc.

 

thanks

[Midas Mk1]

I’ve had efi map my Sc injected car using their software, to be honest I’d stay away from rover injection if you can help it.

[hazpalmer14]

Look on turbominis while sub forum on it and the various ways to inject a mini engine

[Avtovaz]

ok thanks!!!

 

 

i was looking at the spi manifold as its all built in, liek the fuel reg etc...

Edited by Avtovaz, 25 March 2019 - 07:09 PM.

[Avtovaz]

sorry to bring this back up again but why do some systems run 2 injectors when they could run just the one?

 

I think the clio housing and the spi mini housing are more or less the same but used in different cars. The spi looks good to as its one injector, it has the pressure reg built into the housing, tps etc all there in the one unit.

 

 

THe other way id like to go is hide 1 injector inside of a 1 1/2  su, that would be really nice so it looked like a bogo carb.. Has anyone done that yet?

[Wiggy]

Efficiency. In a word.

Injecting into each of the 2 inlets allows more control over how much and where the fuel is going. An SPi system is basically an electronic carb.

It's a natural progression thing. The next step would be port injection for even better control.

[Avtovaz]

ah the one i have seen is like a carb housing with an injector in the top and one in the bottom

 

 

 

 

 

With the factory mpi manifold, i wonder if i can run that from microsquirt, i dont know if it does this simease stuff or not. that would be easy to do i think and also the manifolds are like £100 on ebay.

[unburntfuelinthemorning]

THe other way id like to go is hide 1 injector inside of a 1 1/2  su, that would be really nice so it looked like a bogo carb.. Has anyone done that yet?

I'd like to see that done too, all helps with the sleeper look.

[Steve220]

MPi was to do with better fuel control and emissions. Its an ingenious system, a sod to replicate! I'm using the SC inlet system with a D400 ecu, works well!

[Avtovaz]

yes but why 2 injectors in the same place?

[hazpalmer14]

Don't quote me on his but to inject and different parts of the cycle with different pulse widths I think. Like people have said above a spi is basically a electronic carb. And with sequential injection you can overcome the charge robbing issue using 2 wide bands to measure the AFR in the inner and outer cylinders using sample tubes etc etc.

[Avtovaz]

right that makes sence! I remember years ago i had a lada with a single 45 on it, 8 port non cross flow head, had the manifold made. WHen the engine was standard 1500cc, it was fine, but when i tuned the engine to 1600 with cam and pistons etc, i think it was the outer 2 cylinders didnt run properly. The manifold was basically 2 y sections to the carb. It was charge robbing but it was solved simply with a balance pipe between the wider part of the inlet.

 

I wonder why then the mpi dosnt have 4 injectors, it must be doing something clever with the injector timing.

[Wiggy]

There's not much point because the 2 inlet ports feed 2 cylinders each. Having 4 injectors wouldn't have any benefit unless the head was totally redesigned.

Rover MEMS is a very clever piece of kit.

[Steve220]

right that makes sence! I remember years ago i had a lada with a single 45 on it, 8 port non cross flow head, had the manifold made. WHen the engine was standard 1500cc, it was fine, but when i tuned the engine to 1600 with cam and pistons etc, i think it was the outer 2 cylinders didnt run properly. The manifold was basically 2 y sections to the carb. It was charge robbing but it was solved simply with a balance pipe between the wider part of the inlet.

I wonder why then the mpi dosnt have 4 injectors, it must be doing something clever with the injector timing.

It fires 1,1,2,2,1,1,2,2,1,1.. There's a detailed article somewhere from the guy that invented it.

[Avtovaz]

interested if someone could find that article?!