DIY air shifter

[maverick720]

Ok electrical gurus I'm calling on you. I have access to most all of the components I would need to fabricate my own air shifter setup. What I need to know is: Does the following plan sound plausible?

I have access to air rams of all sizes so first off I would find out which one would apply enough pressure to do the job. Next I need a solenoid, which I also have access to. I have a 9 oz paintball tank that I can use for pressure supply. Now the big question is this, If I interupted the positive side of my coil sticks with 4 normally closed relays and wired the relay coils to my horn button would it effectively do the job? I could install one relay that has two sets of contacts, NO & NC to pulse the solenoid at the same time. I'm not sure if the added resistance of passing the current through the relay and the extra wire would negatively effect the amount of output. Crazy or crafty?

[maverick720]

A crude electrical drawing I threw together to explain myself to those that are electrically enlightened.

[race2win]

Maybe doing more work then needed you running a power commander? PC has a input for delay that you could wire up.

I have a 93 gsxr so I carb'ed but that's all I did with my horn switch I had it running to a relay (since the horn is always -open- switch) hooked the 12V wire powering my coils to the relay so when I hit the horn it would cut the coils. When I hooked my air shifter switch up I hooked it to the same relay so it would cut the coils at the same time it was firing the air ram (since there is a slight delay in the relay I wanted to make sure everything was getting power at the same time)

Only other thing Ive herd but not 100% is with the injected bike they are cutting power and fuel at the same time during shifts? I'm sure somebody on here will correct me

Hope this helps

[sportbikeryder]

You won;t be able to adjust your kill time, it would be based on amount of time you hold the button in. It will also likely set an ecu fault code.

Just buy a kill box.

[race2win]

I dont think your going to need that many relays. One side of the coil + is always switched 12v the negitive wire is the signal wire firing the coil take the 12v away and it cannot fire

[maverick720]

Good info. I wasn't sure how the coil sticks were being fired. If it was the positive side then i couldnt run them all through the same relay because it would interfere with the timing. That makes sense though. I guess I could just buy the kill box and fab everything else up myself. It would be much easier for sure.

[maverick720]

Maybe doing more work then needed you running a power commander? PC has a input for delay that you could wire up.

I have a 93 gsxr so I carb'ed but that's all I did with my horn switch I had it running to a relay (since the horn is always -open- switch) hooked the 12V wire powering my coils to the relay so when I hit the horn it would cut the coils. When I hooked my air shifter switch up I hooked it to the same relay so it would cut the coils at the same time it was firing the air ram (since there is a slight delay in the relay I wanted to make sure everything was getting power at the same time)

Only other thing Ive herd but not 100% is with the injected bike they are cutting power and fuel at the same time during shifts? I'm sure somebody on here will correct me

Hope this helps

My PC wouldnt be able to cut all the fuel or any timing. Only runs lower injectors.

[maverick720]

Ok here's a revised drawing now that i know the ignition coils are pulsed with the negative. I need to double check that for the Honda's. An adjustable delay pot that can adjust from 10ms to 100ms wouldnt be hard to find and install into my drawing. Beats the $200 that these other guys want for theirs. Power to the people.

[race2win]

Yeah that last drawing looks good to me. Another thing you may wanna check is if its positive or negative at the horn switch. On my bike its the negative wire they use at the horn switch. other then that looks all good!

[pafundi]

or just find a nice deal on a used airshifter if your looking to save money. and this way you wont have to be the gunea pig and design the system yourself and from scratch. much faster and less effort and all the bugs have already been worked out and not by you lol the last part is the most important reason......

[maverick720]

Yeah I can make that switch positive easy enough. All i need now is the 10-100ms delay timer for the ignition. I re-revised my drawing to show where it goes and an alternate way of wiring the air solenoid.

[maverick720]

or just find a nice deal on a used airshifter if your looking to save money. and this way you wont have to be the gunea pig and design the system yourself and from scratch. much faster and less effort and all the bugs have already been worked out and not by you lol the last part is the most important reason......

Yeah i understand that reasoning but I think i can build this for less than 100 bucks due to my connections. I can then apply the 300-400 I would have spent on a kit towards something else like.... an LCD-200 so i can start datalogging. Budget racer man

[Spankys Racing]

The air cylinder should be a 1 1/16" bore 2" stroke if I am not mistaken.

[pafundi]

check out carefully somones air shifter setup like reverse engineering and that should tell you what all you will need

[NCZR28]

Even if you use an Off Delay Timer, then the kill time will be based on how long you hold the horn button plus the off delay time. (Ex. 200ms holding the horn button + 50ms Off delay time would be a 250ms kill time) You will have to do something that initially sees a pulse from the horn button and then ignores how long you hold the button.

I would just buy a T-kill which does basically what you are trying to do by breaking the positive on the coil. They are pretty cheap too. No relays needed with a T-kill.