kzz1
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posted December 29, 2002 05:01 PM
 Edited By: kzz1 on 29 Dec 2002 17:02
Intra... Is there a way to use the MPS kill to kill the ignition and fuel at the same time? Wonder if it can be done???
  
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INTRA
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posted December 29, 2002 05:10 PM
The thing I think we've all been missing is that you do not have to be at the rev limiter to float a valve(at least not w/the 12),it will pop nearly every time you shift w/mps,and that is what cuases the bike to spit a shim, my shifter never missed,if I was in the limiter,it's when I missed while foot shifting,but either way,valves are floating in zx12's from the explosion happening every time the mps cuts the ignition(and doesn't cut the fuel),Lee also said Busas have a different shim/spring set up then the 12(as do most bikes)and even though they pop with mps,they do not float valves(spit shims),of course we should watch not to over rev,but that's not why all these 12's went down.
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INTRA
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posted December 29, 2002 05:13 PM
kzz,give lee a call,he's got an easy fix to where we do not have to use the mps box,I would think that it would be hard to synchronize the two together anyway.
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kzz1
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posted December 29, 2002 05:14 PM
Do you think that cutting off the fuel supply through the MPS kill box idea would work?
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kzz1
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posted December 29, 2002 05:17 PM
Intra... Do you have Lee's #
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INTRA
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posted December 29, 2002 05:18 PM
If the wiring from the box could run to a relay unit to the fuel pump wiring,I don't see why not,but you would still have to get the details on what else(if anything)needs to be done to make it cut off and come back on.
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INTRA
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posted December 29, 2002 05:19 PM
704-599-1507
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zxlnt
Needs a job
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posted December 30, 2002 07:14 AM
Does the MPS have an output that goes to ground or something? Wire the relay up to the output on the MPS box to ground the a normally closed relay. When the relay is activated it would open the 12V circuit to the fuel pump and shut it off. When the shifter is done is closes the relay again. I wonder if a mechanical relay would be fast enough or should one use an electronic relay.
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zxlnt
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posted December 30, 2002 07:15 AM
Does the MPS have an output that goes to ground or something? Wire the relay up to the output on the MPS box to ground the a normally closed relay. When the relay is activated it would open the 12V circuit to the fuel pump and shut it off. When the shifter is done is closes the relay again. I wonder if a mechanical relay would be fast enough or should one use an electronic relay.
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your car is slow
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posted December 30, 2002 09:59 AM
Just like the nitrous....would cutting power to the fuel pump for mere milliseconds actually make ANY difference whatsoever in the combustion chamber given that the fuel is already at what..40 psi??
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zxlnt
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posted December 30, 2002 10:45 AM
Maybe, remember the nitrous is pretty much filling up or at least partially inside the airbox. So it will have much farther to travel to get inside the engine and will continue to get sucked into the engine even after u let off da button. The injectors will react much faster than the nitrous solenoids could ever think about.
IMO which may or may not be correct 
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your car is slow
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Fuck Nitrous...Got Boost?
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posted December 30, 2002 01:02 PM
Oh I didnt realize you were talking about cutting off the injectors...I thought you meant to cut off the fuel pump.
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kingzx12r
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posted December 30, 2002 01:36 PM
I think shnitz has heavier springs now, I thought I read somewhere they had a similar problem on Ryan's bike and the new spring kit fixed it. Touch wood I have not had this problem but I will likely replace the springs to be safe.
I think the combo of fuel and the nitrous make the bang with the air shifters worse than just fuel, the spark delay amplifies the problem times 10. Springs might be the answer not sure I hope so the 12 gets enough bad publicity without shim spitting. Just my .02
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zxlnt
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posted December 30, 2002 02:21 PM
Well YCIS I was talking about killing the pump, but killing the injector would be the hot set up. Only thing with that is you have 4 of them to kill intead of just one wire for the pump. I am sure their are plenty of places to interrupt power in the injection system. Myself I am gonna get the springs and retainers anyway. I dont want to be grenading my new 1270 I am going to build in the next week or so.
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your car is slow
Needs a job
Fuck Nitrous...Got Boost?
Posts: 4089
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posted December 30, 2002 02:23 PM
perhaps we could make some sort of splice...or someone could find a way to design a box that would drop the pulse width to 0 during a shift.
Hell if we can modify the pulse width already with the PC3...why cant you mod it all the wya down to "OFF"
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cowboy
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posted December 30, 2002 05:42 PM
Talk to Lee today and he said he kills the fuel pump.
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supraman95mb
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posted December 30, 2002 05:43 PM
I heard that ZXLNT, I am building my 1361 right now. I have my head ported and polished and I am working on finding a good solution as far as the springs go. I know Lees has upgraded springs. Who knows where we can get a set of titanium retainers?
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02 Stroked 12R
95 Supra Single Turbo 750+ hp
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zxlnt
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posted December 30, 2002 06:06 PM
Schnitz racing.
Titanium Retainers Part Number 0025-00007 $234.95
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KZZ1
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posted December 30, 2002 06:14 PM
quote:
Talk to Lee today and he said he kills the fuel pump.
Haven't had a chance to talk to Lee's but did Lee say how he was killing the fuel pump? Would HD exhaust valve springs still be neccessary?
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cowboy
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posted December 30, 2002 07:03 PM
He said something about using a air kill type for the air shifter and that somehow killed the fuel pump also.I will definately be doing the springs but this killing the fuel pump thing is for the guys that have the popping between shifts.I don't get any popping with 2 stage dry(34s)so this is not as much of a concern.I know the reason my keeper popped up and i almost dropped a valve was because of hitting the rev limiter while trying(unsucessfully)to shift with a air shifter.
I talked to Coby Adams who also says the muzzy shifter will work fine untill you start making any power.Then you need the larger ram and push right on the shift lever along with cutting the tranny gears.
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INTRA
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posted January 12, 2003 03:43 PM
Cowboy,mine popped and it was two dry 38's,but from what a few people said that day-they did here it pop a few times,I just can't remember exactly on the run it dropped the valve if I hit the limiter or not,that run was like riding a wild bull,wheelied in first,slammed down,then wheelied in second,slammed my nutz in the tank on the way down,then hit both stages at the same time the rest of the way down feeling the power drop off,has anyone here stood up a 65" bike at the top of 2nd gear??-it sucks.
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cowboy
Pro
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posted January 12, 2003 05:25 PM
Sounds like the only popping you heard were your balls.lol.
Intra,what shifter setup were you using and was it missing shifts?You may have already said this but i don't want to go back and read.Also did you just say you had the heavy duty springs installed when this happened?I just ordered springs and retainers from Coby and talked to someone else about the nlr kill box and i should be ok next year.Hopefully
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INTRA
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posted January 12, 2003 05:37 PM
I had stock springs when it messed up,new springs now,also,I have an MRE shifter,installed vertically,never missed shifts,but I did have to remind myself to use it during my passes,I would forget sometimes,after it got out of shape or something,I was so use to foot shifting,and this was the first day using an air shifter,plus,I had the second stage nos button on the right side to remember to press as well.I hope the springs will be the fix this time.
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IslandRider
Parking Attendant
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posted January 13, 2003 11:17 PM
Call Carolina Cycle 704-279-4478 for the heavy duty spring, shim & titanuim retainer kit. I think it's just under $300 for everything. Just saw a set a couple of weeks ago on Ebay for $175 from moonlight cycle in Carolina that didn't sell. They may still have it.
I'll soon be out as a Guinea Pig for y'all. Just got the 1361 on the road after break in and dyno, I'll be at the strip air shifting w/MPS kill all motor to get the feel and then on the NOS. I got the valve spring kit from above and hoping from all the info here that I'll be safe.
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kzz1
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posted January 14, 2003 01:32 AM
Good Luck IslandRider and keep us posted with the results!
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