GT 1752 and Mirage manifold :) ...... :(
Turbo Mini Forums

Hi,
I've been reading up overnight about inj postitioning. Fuel shear is mentioned and pointing the injector into the air flow, at low air speeds it's crap, but I was thinking it would be ideal on boost?
Also injecting a long way from the valve is crap at low air speeds, but good for taking heat out of the air, again ideal on boost :)
So what do you think of my idea....
One injector up by the manifold face, the other (staged) up by the TB pointing into the air flow?
Cheers,
Gavin :)

Edited by Bat on 18th Jan, 2008.

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Edited by Paul S on 18th Jan, 2008.

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."

how does the spi work with one inj?
if its a code thing perhaps you could replivate that gav ,

i think the inj into the stream is a good idea , they used it in f1 on some engines
but it would as you say have to be phased in on boost and perhaps at a higher rpm than initial onset of boost . i think id prob have 2 inj on the outside of a bend , but hey if its not perfect its easy to change em around a bit , you could even wack on a load of bungs with blanking plugs and try all sorts ?

feeding each inj with a seperate fed allows a bit of flexibility in their testing you could strap them in the way i have , or ,you can thread the inj and screw it into a boss .
other wize the boost will launch them over the horizon like a couple of bosch micro torpedoes .

Edited by robert on 18th Jan, 2008.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Hi,
I purchased some bosses off Jenvey, about £6 each, so it's not a major expense to move things around.
What Paul says is one of my concerns getting good fueling on light loads.
Rover injected above the butterfly if that makes a difference, I've no idea about timing other than 2 missing teeth 180 degrees apart on the flywheel....
Sprocket is running an aftermarket ECU on a near standard SPi system, which passes a cat test with no cat, so it can't be that difficult?
The americans seem to have a thing about strips of bent metal in the pipework to promote swirl in TBi systems????

EDIT: I thought "I'll be cheeky and ring Jenvey!"
Simon said (lol) put one injector at the inlet manifold port as you need it there to minimise wall wetting or it'll drive horrible round town.
The other pointing the opposite way up stream...
I don't suppose for a minute he's as A series knowledgeable as you guys :)
Cheers,
Gavin :)

Edited by Bat on 18th Jan, 2008.

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

Visit www.doyouneedabrain.co.uk

My Mini build diary