budwardo
Novice Class
Posts: 64
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posted April 07, 2008 06:31 AM
decel backfire
I know they all do it some but I cut my can down on my exhaust and it really does it now. My old busa had a smog pump I blocked it off and it stopped the decel popping. Checked header pipe and have no leaks.
  
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stevewfl
Moderator
Posts: 27920
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posted April 07, 2008 06:36 AM
 Edited By: stevewfl on 7 Apr 2008 07:37
there's a plethora of info on this topic posted, try a search. you can use google to search bikeland as well
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2010 Concours14
'08 R1 YAMAHA
ZX14 gone!
CBR600RR track bike
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Raptor14
Expert Class
Posts: 264
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posted April 07, 2008 02:51 PM
The backfire or popping is related to air getting into the exhaust system, but I seriously doubt that you will be able to eliminate it by sealing the system. The ZX14 ECU cuts the fuel flow when the throttle is closed and the rpm is above 3500 rpm. It does this to meet Euro 3 emissions. When the fuel cuts back on it backfires. Air will be in the exhaust since it gets pumped by the cylinders. Sealing the leaks doesn't stop the decel backfire. With the stock exhaust system the catalytic converters and exhaust baffles tend to muffle the backfire and you don't hear it. When you go to a full exhaust system it really can become apparent. Mine even shot flames out the back. I already put a post on a fix, but I'll repeat.
You need to complete each step. No step can be skipped. This is the only solution I know that works (excluding a very careful throttle control during decel, which I can do but was a pain).
1. Lock the ECU in the neutral fuel map, which does not cut fuel when the throttle is closed. Indeed, if it did, the bike would stall. The fuel maps for 1st through 6th gear cut the fuel. I know of no fix other than locking to the neutral fuel map. The easy way to do this is to pay $65 or so for Ivan's TRE006A and perform the simple 5 minute install. If you are so inclined, you can make your own resistor with parts from Radio Shack. Me, I bought the TRE006A from Brock's Performance since I happen to like the guy and I want to support his business.
2. The neutral map also delays opening of the secondary throttle plates (flies). You have to remove the flies or you will lose a ton of low-to-mid range power. More on this later.
3. With the flies out and the ECU locked in neutral you have to add a Power Commander and a fuel map appropriate for your setup. Brock offers a special map compatible with his exhaust system for those running a TRE006A with flies out. Ivan does the same. I don't know about Muzzy. If you don't run the right map you f/a will be too lean and you will risk damage to the bike over time.
After making the above modifications I have never been able to induce a backfire or a decel pop, and I've tried. I already had my flies out, Brock's exhaust, and Brock's map. When I installed the TRE006A and changed the map for the new setup I noticed no loss in low end power relative to the previous setup (based on seat of the pants - no dyno run). Brock states that 1/4-mile times are slightly reduced due to a small power loss at the high end, most likely due to reduced ignition timing. Being a street rider that makes no difference to me. On-off throttle transitions are also smoother than before.
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tnchip
Expert Class
Posts: 164
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posted April 07, 2008 03:32 PM
Nice info Raptor.Does your gear indicator show N all the time?
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Raptor14
Expert Class
Posts: 264
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posted April 07, 2008 03:35 PM
Yep, the gear indicator shows N all the time. I never paid much attention to it anyway. It responded too slow. Losing the gear indicator was well worth losing the backfire.
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smokinzx14
Needs a life
Posts: 10197
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posted April 07, 2008 03:50 PM
Leave it be !!!! I love the big pop and it scares off any Busas riders when you shoot a big old flame at them .. 
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Smokin Performance Cycles..
Tampa Bay , FL .. Brocks Performance Dealer ..
Gen 2 ZX14R Best ET 8.43 , Best MPH 164.95
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dubious
Needs a life
Needs more time to ride!
Posts: 8442
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posted April 07, 2008 04:01 PM
fried chicken.... mmmmm LOL
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natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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bigdtd
Needs a job
Interceptors
Posts: 4209
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posted April 07, 2008 07:11 PM
i love my backfire bomber!!! you can control by eliminating air leaks and watching the throtlle application, but there is nothing like lighting up a bunch of squids on the way to oz.
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2006 Black ZX-14,6 inches over,16/42, flies out,BMC Street Filter,Brock's Street Meg,Brock's Radial Mount Strap,PClll with Race map,Dynojet LCD w/Techmount, ZX-14 fender eliminator,Pilot Power2CTs,Speedohealer,Pazzo Levers,Cox Radiator Guard, Garmin Nuvi 265WT
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DaedalEVE
Parking Attendant
Posts: 19
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posted May 28, 2009 12:32 PM
Sorry to awaken an old thread, but I did have a quick question.
I decided to get a GIPro to lock in the neutral map and derestrict the limiter... but I was curious how the neutural map varies compared to the other gear maps? I mean obviously the neutral map doesn't cut fuel on decel, but is it different in any other way?
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08 ZX-14 (Silver), ASV Levers, Spiegler Lines, Spiegler/LSL Sliders, Flies Out, Marble Mod, PCV, Muzzy M14/M10 Full System
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117 in a 30
Novice Class
Posts: 43
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posted May 28, 2009 03:29 PM
nothing better than watching jump when a two foot blue fireball comes out. Works best when doing 150mph+ fly-by on unsuspecting cagers on dark 2 lane highways, takes a little practice but when done right they shit even worse than when you just buzz'em. And no i cant see them jump, but they do almost go in the ditch.
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ZX11D
Zone Head
Internet Police
Posts: 674
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posted May 28, 2009 05:04 PM
Another decel backfire fan here. I love slowing down behind slower bikes and other traffic. They seem to want to just get out of the way A.S.A.P. 
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'94 ZX-11
'07 ZX-14
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TooHype
Expert Class
Go Hard or Go Home !!
Posts: 427
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posted May 28, 2009 06:00 PM
quote:
Another decel backfire fan here. I love slowing down behind slower bikes and other traffic. They seem to want to just get out of the way A.S.A.P.
+1
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Go Hard or Go Home !!....2007 Diablo Black ZX-14, BMC Race Filter, Brock's Alien Head, Brock's Radial Mount Strap, PClll with Custom Map, Flies removed, Muzzy fan, Muzzy lowering links, Muzzy Fender Eliminator, 16/41, Speedohealer, Stretched 6", Lowered 3" IN GOD I TRUST !......If You’re a Hater….KILLYASELF !!
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LLcooljebb
Expert Class
Upgrade I Must
Posts: 146
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posted May 28, 2009 06:51 PM
quote:
quote:
Another decel backfire fan here. I love slowing down behind slower bikes and other traffic. They seem to want to just get out of the way A.S.A.P.
+1
+2 I'm gonna try mine with the baffle out, it should be sweet (smeg)!
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"no time to be void or save up on life
you got to spend it all.."
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