41 replies to this topic

[ed4ran]

If i could do Injection on my engine and use my megasquirt i think i would stick with the A series alot longer, and as my brother is ditching his injection for a turbo i will be able to use his injection stuff to play with! :grin: now if i could just inject it then turbo it

[miniboo]

now theres something i hadn't though of.

Use the throttle body and injector of a spi and then use megasquirt to run it.

Do you reckon yoiu can get to work ed4ran??

[Sprocket]

You would need to fit a normal crank sensor, as Ed already has. Don't think any one has decoded the Rover SPI crank sensor pattern for the Megasquirt ECU

[ed4ran]

So you reckon it will be as easy as putting the injector straight to megasquirt (of course the other sensors as well) i cant say that ive looked that much into the setup with megasquirt, and how hard you think its going to be to seal it all for turbo use?

[minidaves]

why the hell would u want to use the electronic carb from an spi, i mean an su carb if all rebuilt/working correctly will out perform that junk anyday

dave

[Sprocket]

how hard you think its going to be to seal it all for turbo use?

Working on it right now. The throttle needs to be removed as the injector is the wrong side of it. A throttle boddy from a rover turbo would then need to be fitted between the injection body and turbo/intercooler.

Good thing with the spi injector is that it produces a conical spray pattern rather than a jet. This, I recon would replicate the HIF44 carb. Also the fuel regulator would need slight mods to get it to be boost sensative. A plenum to replace the filter will need fabricating held down by the three original bolts.

Only thoughts at the minute, may even put the 16valver on hold for a bit longer and do this.

Currently sourcing a bigger injector.

[Sprocket]

why the hell would u want to use the electronic carb from an spi, i mean an su carb if all rebuilt/working correctly will out perform that junk anyday

dave

Lack of control of the fueling why did they do away with carbs and go to injection in the first place

[minidaves]

if set up correctly an su carb can be as good with fuel as injection but not as easy thats for sure. I guess i am just old school and like things to be mechanical and practical which also means its goto be really broken before i call the aa.

If u want a large injector for an spi either rover 200 jobby or one from like a 1.6 pug from around 92 will do fine as me mums pug 205 1.6 has basically the same throttle body as a spi

dave

[DaveCoxon]

Aftermarket Injetion on an A-series - ooh, what a good idea! I might have to try that. Sounds pretty simple really

[Sprocket]

Aftermarket Injetion on an A-series - ooh, what a good idea! I might have to try that. Sounds pretty simple really

Lol

Not sure how to take that :cheese:

[ed4ran]

What about the twin spi thing? you reckon that would work?
Two spi injectors and manifolds, with one throttle body providing both?
and how hard is it going to be to modify the fuel pressure?
All sounds tempting :grin: maybe i should have a play!! might have to start with getting MS going with standard SPI stuff.

[Sprocket]

Oh and now just thinking of removing the throttle from its body, plugging the holes and having the plenum made up with the same throttle built into it, using a bypass idle control valve.

Its not overly complicated. I've seen a twin single point throttle/injector body set up made up but not working yet, all ready to go. They guy never new about Megasquirt which could drive the two injectors

[Sprocket]

What about the twin spi thing? you reckon that would work?
Two spi injectors and manifolds, with one throttle body providing both?
and how hard is it going to be to modify the fuel pressure?
All sounds tempting :grin: maybe i should have a play!! might have to start with getting MS going with standard SPI stuff.

No, it was two throttles and injectors and one manifold. Ill speak to the bloke see if I can get some pictures

[P3STH]

Hello All, Happy New Year.

I am that bloke

Cheers Mini Sprocket.

correct not two manifolds (where would you put that lot?) just the one.

I need to correct you on one bit Mini Sprocket, it does work and always did, although in a fashion because, like you say, i had no driver for the 2nd injector.

I drove the car with it on, no leaks, around the block a couple of times, just leak & 'fouling' checks, of which there were none.

I have never really pursued much, the need for an amplifier which is all it needs to run the second injector from the original ecu trigger.

I made this assembly 7 or 8 years ago! with standard parts original for the spi.

an opinion for you: - the advantage of carbs is limited to the fact that they allow the engine to draw what fuel it wants at low revs in particular, hence the ability to run wilder cams that in an injected form that 'gives' fuel whether needed or not, causing tuning difficulties as a result of cam overlaps etc.
This advantage is quickly affected by the rolling road tuning limitations of the likes of (no matter how well set up) su's, which would always be the best carb'd choice for most, for historical and originality/practicality reasons. They are not able to be adjusted for incremental rev range & load fuelling, only 'near' fuelling due to the millions of jets not being accurate for each individual engine.
Peter Baldwin (you either know him or you don't) set up my car as spi, to 95bhp with more accurate fuelling than a later setup with twin 1 & 1/2" su's, although with su's i had a slightly wilder cam and about 5bhp more.

can't post pic, it won't let me, i enjoy cars and bikes more than computers, the file is too big i think.

Attached Files

•  2004_05282003050016.JPG   211.6K   4 downloads

[Jackman]

It sounds quite possible and easy after some research, i may do some research on what parts will be needed.