strikerbird
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| posted on 21/11/14 at 10:23 PM |
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Quickshifter on a turbo bike engine
I'm in the middle of turbo charging my honda blackbird engined striker hillclimb car. I'm unsure about still using my dynojet quick shift
as it cuts fuel to allow the shift.
I'm worried cutting the fuel may cause it to run lean, that wouldn't be good!
Has anybody used the quick shift on a turbo bike engine before?
I'd like to keep the shifter it does save time, I need all the help I can get!
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chrism
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| posted on 22/11/14 at 01:17 AM |
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According to this
link you can set
it to cut fuel and/or ignition for the quickshifter by reprogramming the power commander. So you could set it to cut ignition instead of fuel and
prevent it lean burning, but you would end up with unburnt fuel going into a hot turbo, but I think its only for a fraction of a second anyway.
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A little hard work never killed anyone, but why take the risk!
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Nickp
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| posted on 22/11/14 at 07:39 AM |
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quote:
Originally posted by chrism
but you would end up with unburnt fuel going into a hot turbo, but I think its only for a fraction of a second anyway.
As a bonus you might end up with FLAMES!! 
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strikerbird
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| posted on 22/11/14 at 08:18 AM |
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My power commander only runs the injectors so I can't set the shifter to cut ignition. I can't decide if it's safe or not, it cuts
the fuel so there's nothing burning at all, so it can't be lean (I think)
Could be expensive if I'm wrong. Could do with finding someone who's used the same setup.
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INDY BIRD
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| posted on 22/11/14 at 08:29 AM |
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i did it on my zx10 turbo and was iginistion cut out on a flat shifter,
ps i also did a carbed blackbird turbo and it produced 260 at the wheels at 9psi
but being honest not the best engine for reliability to start with,
hope yours goes all ok, when they are on full chat there rapid
and yes i did melt a piston on mine due to fuel issue so you are right to be cautious with fueling cut out etc,
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ReMan
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| posted on 22/11/14 at 11:27 AM |
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Surely cutting the fuel completely for a few millisecond to shift is different from running lean and melting a piston?
no fuel =no burn at all?
www.plusnine.co.uk
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strikerbird
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| posted on 22/11/14 at 01:24 PM |
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quote:
Originally posted by ReMan
Surely cutting the fuel completely for a few millisecond to shift is different from running lean and melting a piston?
no fuel =no burn at all?
That's what I thought but I've been told to use an ignition cut rev limiter because the standard bird ecu cuts fuel.
Bit confused unless the bird ecu does lean the fuel when the rev limit is reached.
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strikerbird
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| posted on 22/11/14 at 01:26 PM |
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quote:
Originally posted by INDY BIRD
i did it on my zx10 turbo and was iginistion cut out on a flat shifter,
ps i also did a carbed blackbird turbo and it produced 260 at the wheels at 9psi
but being honest not the best engine for reliability to start with,
hope yours goes all ok, when they are on full chat there rapid
and yes i did melt a piston on mine due to fuel issue so you are right to be cautious with fueling cut out etc,
I'm looking for around 200hp to be in the safe side. Should be fun. Like you say not the most reliable lump in the first place!
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metro6r4
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| posted on 22/11/14 at 02:42 PM |
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don't run the flatshifter if it cuts the fuel as you will wreck your motor, if you use a ignition cut flatshifter your exhaust will spit flames
but you won't wreck your engine
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Autoflock Motorsport
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| posted on 26/11/14 at 01:04 PM |
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may be worth looking into the auto blipper/flatshift kit?
I have the very very old version from klicktronic, the lads there are very very helpful. I would defo recomend giving them a shout and see what they
think as they may be able to come up with something and utilise what you have already got. Mine is an ignition cut :-)
Kind regards
Raj
http://www.locostbuilders.co.uk/forum/23/viewthread.php?tid=183445
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dave_424
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| posted on 26/11/14 at 01:25 PM |
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I read that since the fuel cut happens so fast that there isn't a chance for detonation or lean condition. Overrun fuel cut doesn't make
your car burn up pistons from going lean or detonate, but that goes in hand with throttle closing so not really the same as full throttle fuel cut.
If you can then obviously ignition cut is better
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grazo
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| posted on 22/4/15 at 12:53 PM |
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The Flatshifter Expert system can be used to cut the ignition or the fuel the choice is yours.
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hobbsy
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| posted on 22/4/15 at 09:21 PM |
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As other have said the fuel cut is just that it cuts it pretty much totally or enough for a misfire. So its not the same as running lean. I.e. it is
safe
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theduck
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| posted on 22/4/15 at 10:08 PM |
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I would rather be cutting ignition than fuel in that situation. Unburnt fuel going into the tubro, thats called anti lag isnt it? 
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