Siamesed Code Trial
Turbo Mini Forums

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."

i wonder if a really small set of injectors ,but still big enough to provide what you need ,with a bigger pulse width ,may make a difference?

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

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."

Paul, do you have the same pulse width for both inner and outer ?

I now have a well running engine with a stable transient AFR (around 14:1). Inner pulses are 80% of the outter. Plugs are of the same color. However I can not be sure the true AFR is close to the average.

I tried to move the outter pulse start between 20 BTDC and 10 ATDC and this does not change AFR for high and low MAPs.

Edited by alpa on 10th Feb, 2008.

std 998 A+, g295, MD266, RHF4, 109hp @0.8bar/5400rpm

The code is only semi-sequential and we have the same pulse width for inner and outer cylinders.

You need to have two widebands to know exactly what is happening.

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."

Am I right in assuming that you have to have the same pulse width for both as you don't know which one is open when you squirt the fuel in due to a lack of a cam sensor?

EDIT: After reading this thread for the eight time I think I'm starting to understand this injection thing.

Edited by Rob H on 10th Feb, 2008.

Edited by Paul S on 10th Feb, 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."

can you try firing it into 2 and 3 direct and 1 and 4 in the secondary pos ,the priority going to 2 and 3 ?, i know it sounds topsy turvey , bit if its easy with a few key strokes ,what is there to lose ?
just trying a new theory i thought up !

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

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."

what is there to lose ?

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

Edited by Paul S on 11th Feb, 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."

Your Wifes 12???

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."

ok you wifes 11??

leap year??
regards
dave

Yes, born on 29 Feb. So it's a bit special when it comes round.

Taking the Eurostar to Paris for a weeks break.

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."

ah fair enough paul i thought it was at the despondant stage still , great that its at the getting there stage ,...
is it worth playing with fuel pressure and so dropping the pulse width , making it longer from pulse end to no3/2 opening ?

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

Higher fuel pressure may be worth trying. The improved atomisation may reduce the pooling.

At present, I think that a fixed proportion of the squirt is hitting the bung wall, forming droplets and running down the manifold floor.

The droplets from the squirt into the outer cylinders end in in the inner cylinders making them run rich. The same does not happen with the iner cylinder squirt as it has time to get to the cylinder.

All theory, but unless I modify the manifold to prove it or otherwise, then there is no point in any more testing as it stands.

I might just wack the fuel pressure up to 3.5 bar and adjust the "fuel required" to suit and see if it makes an improvement.

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."

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."

PMSL

thats a lot more info than i needed !

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

https://www.facebook.com/pages/Fusion-Fabri..._homepage_panel

www.fusionfabs.co.uk



1/4mile in 13.2sec @ 111 terminal on 15psi

its a good point about the injector bore, when i did my ones i just did a 13mm hole and tapered the injector end to get the o ring in.

admitedly I've only been following this loosly as i have already solved the port robbing the chickens way LOL, but would having a trigger wheel on the cam only be an option, that will give you the engine phasingwith only one sensor.

Excuse my ignorance again...

If I've understood it right each 360 degrees both ports are fired simultaneously, hitting the closed valve on an inner cylinder and the open valve on the outer cylinder at the opposite end, then vice versa the next 360 degrees.

Therefore is MS just using one of the two available injector drivers to fire both port injectors at once (every 360 degrees at the appropriate point) ???

If so, is it using the second driver for staged injection but still on a 360 degree cycle, or is the second driver spare ???

Sorry it's all questions at the moment.

Rod.

Schrödinger's cat - so which one am I ???

You are correct.

The large MPi Mini injectors have a theoretical power limit of approx. 90 hp when using this method.

Hence you need four injectors for anything higher. The second pair of injectors are on the second injector driver.

I initially ran all four together from idle upwards but over the weekend found that just two, one per port gave far better results. My theory is that the two sprays just saturate the air and cause pooling.

I plan to stage the second pair in on MAP. If they come in once on boost, the extra heat will help prevent pooling.

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."