15 replies to this topic

[spiguy]

Hi folks,

 

possibly a daft question... A while ago I got hold of a throttle body from - I believe - a 1.4 K series Rover engine. It was from a guy who has a K series mini ( I think) . It looks basically the same as my mini Spi one, the reason I got it was to take the Throttle pot off it as a spare.

 

It also has the injector still attached to it. Now it looks exactly the same as the mini one (I haven't compared any part numbers yet - need to dig it out the garage) EXCEPT that the plastic top part is green rather than yellow.

 

Just wondered if anyone knows if this is the same injector, or if it is in any way usable on the SPi mini - I am certain it is the same physically so would fit, just wondered what it might do - would it deliver a little more fuel if intended for the 1.4 engine?

 

Just curious in case anyone is familiar with this part.

 

Cheers

Craig

[Guess-Works.com]

The top part is the same on the metro 1.1 and the Mini, the metro 1.4 has the same as the rover 200 and most other single point 1400 K series engines.

 

Would it deliver more fuel, yes and no, it's capable of delivering more fuel, however, then ecu should alter the amount of fuel injected to prevent over fueling and rich running...

 

So in theory if the fueling is running lean at the top end then a bigger injector will then allow for that fuel to be delivered, it should not affect running in the lower reaches of the rpm range.

[spiguy]

Thanks. After I posted that, I kinda thought that. The ECU will adjust fuelling according to the O2 sensor, so I imagine it would only really make a difference under full throttle where the O2 is ignored. Might try it for kicks anyway!

 

Cheers

Craig

[Phil-R]

Have you got the part number? Sprocket did some research on the different injectors

[mini13]

I suspect that the ECU can only adjust the fueling a certain amount, perhaps 5 or 10%,

 

what you could do is discharge the injector into a container  by giving it a solid 12v feed and measure the amount discharged in say 1 min, or 30 seconds. I know for example the MPI injectors are circa 460cc/minuite

[Fast Ivan]

worth having a go just to see what happens, let us know

my thoughts, I think the problems would come with the idle qual

ity and the emissions, assuming its a larger flow

certainly wont give you any more power though, but if your engines highly tuned it might deliver the fuel required for that state of tune if its struggling on the standard injectors 

[FlyingScot]

Normal SPI injector is 0280 150 682 and is yellow top
Rover k8 1.4 injector is 0280 150 683 is green top

These are bosch part numbers.

Flow rates by bosch part number..
http://www.injectorc....co.uk/flow.htm



FS

Edited by FlyingScot, 24 October 2014 - 08:08 PM.

[mini13]

Give that man a bannana ^^^^

 

ok so std injector is 680cc and the replacement one is 802cc is 17% more flow, thats going to cause issues IMO unless remaping is done.

 

you could probaly get around it by dropping the fuel pressure from 3 bar to 2.5bar, but that would mean an adjustable fuel reg anf=d a guage...

[FlyingScot]

It's a standard MEMS ECU, can't remap. Fuel pressure in an SPi runs 1.0 bar with standard regulator.

FS

[Steve220]

It's a standard MEMS ECU, can't remap. Fuel pressure in an SPi runs 1.0 bar with standard regulator.

FS

 

Is that with vac assist at idle? Because that is incredibly low for any fuel injector loop. Its usually around 3 bar vac removed. I doubt the car will even start with the K series injector as the ECU will just provide standard injector pulses for its start sequence and will end up over fuelling it instead.

 

Once started MEMS has only a set target range on outputs and with a larger flow injector unless its properly mapped to compensate, you will not see any gains to performance as you will have no real idea what the fuelling is doing higher up and under load, i highly doubt MEMS would be able to cope.

[mini13]

for an SPI thats about right, those large single point injectors do run at about 1 bar, and IIRC dont have a vac reference so they are 1 bar all the time.

[Steve220]

for an SPI thats about right, those large single point injectors do run at about 1 bar, and IIRC dont have a vac reference so they are 1 bar all the time.

 

gotcha

[Fast Ivan]

manual states 1 bar, just to confirm

[Aus]

Sorry to resurrect an old thread but in my search for a replacement TB for my friends SPi I turned up a company that had what appeared to be a brand new complete Mini SPi throttle body, injector housing and inlet for sale but I noted from the pic they sent me that it had a Metro style throttle linkage arrangement (acts directly on the spindle rather than by lever type linkage) and the injector cap was green. I turned it down as it would not be a bolt on replacement but I was wondering whether there was ever a "performance TB" upgrade offered for the SPI which used the 1.4K8 throttle body assembly but on a Mini manifold and if so have I stumbled across one ?

 

I don't know anything about the Metro 1.4 TB itself, ie whether it has a bigger throat as well as the higher flow injector but if so it sounds like its something that could be good for a big bore SPi set up esp. when matched with an SC Typhoon ECU - potential to break 100bhp ?

 

Anyone ever heard of such a thing ?

[Guess-Works.com]

The Metro SPi throttle body and the Mini one are almost identical... I think the differences you've highlighted are the actual differences...

 

Coupling it with a typhoon which is mappable, could make use of the bigger injector, but coupling the typhoon with the standard SPi unit yields good results anyway... 

Edited by Guess-Works.com, 03 August 2016 - 12:30 PM.