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DIY Fuel injection thread.


yoeddynz

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I have been conned into helping a workmate EFI his Vmax yamaha motorbike thingee, he is hellbent on chopping carbs to bits to install injectors where the carb needles would normally sit (this is what the internet has told him to do along with little deflector plates to help the fuel turn 90 degrees, this will result in very long / ugly fuel plumbing and add to the overall width of the engine which is not a good thing...

 

I am suggesting a setup which involves positioning the injectors inside the airbox standoff styles, similar to the below link but with a longer runner (and the gutted carbs to still be the throttle butterfly) so probably 100mm ish from the injector tip to the butterfly.

 

Question: Will there be any low flow / idle advantages / disadvantages with the stand-off setup or any other possible issues setting up the injectors in this manner. (Would like to avoid a yamaha bbq here if I can)

 

 

Also can I use a microsquirt to control a fan? I had a very quick look and it didn't seem to have a suitable output.

 

link to pic since i can seem to imbed image

 

http://www.apriliaforum.com/forums/showthread.php?171789-Shower-injectors

 

 

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But I dont want to.

What is a wasted spark multicoil setup going to do that a Dizzy wont.

Unless the dizzy wont work then fuck you and yo momma too

Dizzi will work sweet. Just use ecu to run igniter to charge/fire coil.

I use this set up on my escort. Only 4 teeth inside the dizzi for a pickup. ( or 2 teeth on crank will work)

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Nah. Ditch the shitty fucking dizzee with its loose bearings, things that need oiling, ugly as fuck crack prone cap and run wasted spark on a mitsi gt slow or similar coil from wreckers. And go ms. It's great and it's cheap and you're a bike mechanic.

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I have been conned into helping a workmate EFI his Vmax yamaha motorbike thingee, he is hellbent on chopping carbs to bits to install injectors where the carb needles would normally sit (this is what the internet has told him to do along with little deflector plates to help the fuel turn 90 degrees, this will result in very long / ugly fuel plumbing and add to the overall width of the engine which is not a good thing...

 

I am suggesting a setup which involves positioning the injectors inside the airbox standoff styles, similar to the below link but with a longer runner (and the gutted carbs to still be the throttle butterfly) so probably 100mm ish from the injector tip to the butterfly.

 

Question: Will there be any low flow / idle advantages / disadvantages with the stand-off setup or any other possible issues setting up the injectors in this manner. (Would like to avoid a yamaha bbq here if I can)

 

 

Also can I use a microsquirt to control a fan? I had a very quick look and it didn't seem to have a suitable output.

 

link to pic since i can seem to imbed image

 

http://www.apriliaforum.com/forums/showthread.php?171789-Shower-injectors

 

ideally you want an ecu that can run sequential injection, and adjustable injector timing.    so you don't end up with fuel stand off issues  (fires)   

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Yea fuel standoff can be a bitch it seems, you end up injecting into the reversion pulses and getting a fog going on in the airbox. The guy on here with the beams gets fog with his sweet setup and they are in the tip of the trumpet.

With good injector timing and fancy injectors race cars make it work all the time. Takes a decent setup and dyno time to fail it in sweet. Most DIY chaps will run a set of inboard injectors to get idle sweet and dial back some fuel to the inboards when it fogs.

I scored some honda injectors from some CBR that has factory outboards. Was for a project I never finished but they are badass little injectors that would be sweet for outboards on a small engine, cheap as off eBay.

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  • 2 weeks later...

Holden V6 commies. Easy to get as common as.  They are open element so react quicker? Anyway- located in the airbox. Easy to fit and come with decent plug you can grab while raiding car.  Its a neat push in sensor so you just need a 1/2 hole. See page 4 ? of viva thread for photo of sensor

 

Values I got when I tested them are;  8700 @ 6 degrees

                                                            3200 @21 degrees

                                                            200 @ 100 degrees

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FC and FD RX7s have one something like the one in your link, I used one in my old Subaru.

Pretty sure it was under $30 for a new one from Repco.

 

/Alex is onto it with the Commy ones though, I would have run one myself if I didn't have it under boost.

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Acceleration enrichment..... tips and advice please. I have my ve table etc pretty good and under normal driving it's fine. But at idle if I stab the throttle or while driving try to floor it then flat spot. I can drive around it by just being smoother as can hannah or anyone else used to the car and it's quite quick throttle action (short throw) but anyone not used to it can stall it when pulling away. Especially those used to carbs and they try giving the throttle some little blips as they let up the clutch. Those who drove it in hanmer will now what I mean.

So I need to activate my carb acceleration pump so to say. I only need a little extra so will start as such. Found this good intro on tuning it but looking for any extra tips or advice from those that are well versed in MS tuning.

http://www.diyautotune.com/tech_articles/megasquirt_acceleration_enrichment_tuning.htm

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