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02-25-2004, 11:22 PM
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#301 (permalink)
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Moderator
From: glorious Galt, California
Registered: Jan 2003
Posts: 23,334
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Re: Is this fuel cut?(HELP)
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02-26-2004, 12:35 PM
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#302 (permalink)
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Proven Member
From: Avon, Indiana
Registered: Nov 2002
Posts: 47
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02-26-2004, 01:51 PM
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#303 (permalink)
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Proven Member
Car: Nissan 240sx
From: St. Charles, Missouri
Region: Midwest
Registered: Jan 2004
Posts: 396
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Ok thanks alot
i bought a new fuel pump, 190lph (caugt a good deal! 45shipped)
i am getting a Greddy MBC later this week, hopefully(anyone using this)
i am getting new NGK plugs and wires next week,(as long as i can get a job)
and then within the next few monthes i plan to get:
evo3 o2 housing (should i get ported)
evo3 manifold(ported or not?) my current one has a 3/4" crack
then pocketlogger and SAFC.
does this order of operation make sense? or is there a better plan? thanks alot for the help
-kyle
and anyone reading this in st. louis, who is good or decent at tuning, actually anyoen who has experience tuning. please pm me! thanks
____________________________
-Kyle
1996 Nissan S14
SR20, Coilovers, Brakes...
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02-26-2004, 02:22 PM
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#304 (permalink)
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DSM Wiseman
From: Kansas City, Missouri
Registered: Oct 2002
Posts: 1,783
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I wouldn't bother with the 02 housing or the mani. yet. Save the money for a bigger turbo and injectors.
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03-01-2004, 09:48 AM
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#305 (permalink)
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Banned
From: Minoa, New York
Registered: Feb 2004
Posts: 143
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Fuel Cut Defencer!
I read in the power pages section of superstreet that I need an fuel cut defencer,I already added walbro 225lph fuel pump.Where can I get one,how does it work,how do I install?please help!Also,do you like my car?
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03-01-2004, 10:35 PM
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#306 (permalink)
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Proven Member
From: Yorktown, Virginia
Registered: Oct 2002
Posts: 9
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Stock Car With Fuel Cut?
Ok, here's the story.
1992 Eagle Talon, 6/4 Bolt TSI AWD.
STOCK except for there is no air canister, just a filter.
Engine has been rebuilt to stock roughly 3K ago.
Had a boost controller on it, but not anymore.
No aftermarket Boost Gauge
Stock gauge reads 14psi at WOT.
In 2nd gear it was floored and then bam, fuel cut. With no MBC on it anymore it should be back at stock boost, and the exhaust and intake are all stock witht he exception of the air canister being removed. Any ideas? I know fuel cut to be common on cars with upgraded exhaust or intake, but this one is pretty much 100% stock. TIA!
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1996 Mitsubishi Eclipse RS - Fromerly turbocharged
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03-01-2004, 10:53 PM
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#307 (permalink)
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Proven Member
From: Lebanon, Pennsylvania
Registered: Dec 2003
Posts: 40
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Fuel cut is also common on cars with an intake leak. Build or buy a boost leak tester and check for leaks.
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03-02-2004, 12:32 AM
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#308 (permalink)
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Proven Member
From: Demorest, Georgia
Region: Southeast
Registered: Feb 2003
Posts: 2,281
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Is this useing the factory BCS? or did you just run a line from the compressor outlet to the wastegate?
I dont think the stock pos boost guage should read to 14psi on stock boost. Get a pressure guage of some sort and see what its at. I know my white TSi never hit fuel cut except once when I forgot to hook up the line to the waste gate :o hello max boost:eek:
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03-02-2004, 04:37 PM
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#309 (permalink)
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Proven Member
From: Yorktown, Virginia
Registered: Oct 2002
Posts: 9
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Found the problem. I hooked up my boost gauge using the FPR solenoid and went out for a drive. Just as the boost was about to hit 20psi I let off the gas and started tracing lines. Turns out the BCS vaccum line near the airbox was very loose and almost falling off. I secured it with some zip ties and now boost is a steady 13-14psi.
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1996 Mitsubishi Eclipse RS - Fromerly turbocharged
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03-03-2004, 10:37 AM
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#310 (permalink)
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Proven Member
From: Calgary, Alberta, Canada
Registered: Dec 2003
Posts: 241
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Fuel Cut, or lack of fuel?
90 6bolt with re-wired pump. My MBC was running pretty crappy, so I was boostin FULL ~21 PSI or so(I know, not good) Anyways, so I'd floor it and it would pull nicely until around 5500 or so, then it would stuble REALLY bad. Is this the infamous fuel cut from the ECU, or is it caused by not enough fuel getting to the cylinders? Any ideas? Would a 14B be able to produce enough air to cause fuel cut on stock IC piping? Thanks fellas/ladies.
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03-03-2004, 11:43 AM
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#311 (permalink)
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Proven Member
From: Mountain Home, Arkansas
Region: Midwest
Registered: Nov 2002
Posts: 208
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yea that sounds like fuel cut to me, was there a loud backfire sound and all power was lost? Same thing happened to me the other day, just not with 21psi.
justin
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Justin- Evo Powered TSi AWD
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03-05-2004, 09:46 PM
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#312 (permalink)
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Proven Member
From: Mobile, Alabama
Region: Gulf Coast
Registered: Nov 2003
Posts: 993
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Quote:
Originally posted by leet
I don't know why, but I REALLY wouldn't push your car to where it's hitting fuel cut all the time.
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Yeah, but it hasnt hit fuel cut in over a year now. Before then it would hit fuel cut on cold nights. I didnt have the boost set really high and it was fine on the "usual" hot days here. But when the temp dropped the fuel cut kicked in. But like I said before, no more fuel cut...period, notta, nothing. 
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Mister- E3B16G powered 93 Talon TSi* 24psi tuned.
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03-10-2004, 05:56 AM
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#313 (permalink)
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Moderator
From: glorious Galt, California
Registered: Jan 2003
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http://members.shaw.ca/costall/ECUprimer/ECU_ch7.html
"Should the ECU ever see an intake air mass greater than a certain preset level, it will stop fuel delivery and spark to the engine cylinders. This 'critical mass' depends on air volume, temperature and pressure, as measured by the MAS sensors. The act of the ECU cutting off fuel delivery to the engine is known as the infamous 'fuel cut'."
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03-10-2004, 08:07 AM
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#314 (permalink)
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Very cold (thus more dense) air+15 psi=fuel cut?
I have done the research, but I never found an answer regarding the effects of cold air.
Up until this winter, I have had my mbc up to 15 psi with no problems. As it has gotten colder, I will go to pass someone on the highway or launch hard to get across a 2 lane road and I swear to God it feels like my car is turning on and off, stuttering, and just basically suddenly driving like a piece of crap.
Can this be due to it being so cold that the air is more dense coming in thus adding air to the already higher boost levels and thus causing the ECU to cut fuel?
If so, I know once it warms up no prob, but should I start to consider a new fuel pump and/or rewire, new injectors, or what...and in what order of what to do first?
Thanks and sorry for the somewhat repetative question, hopefully it is unique enough I don't get destroyed.
Boz
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03-10-2004, 03:26 PM
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#315 (permalink)
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DSM Wiseman
From: houston, Texas
Registered: Apr 2002
Posts: 1,240
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Fuel cut is not imposed by actual fuel rates but rather by the ECU based on air flow. The air flowing needs a certain ammount of fuel and the ECU cuts it when it decides it can't give that much fuel.
In general the only real way to get rid of fuel cut is to trick the ecu, replace it with a standalone, or reprogramm it.
Ways to do the first option
S-AFC
gm maf
2g maf
etc etc etc (just make sure you have the increased fuel flow capacity to match)
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03-13-2004, 12:28 AM
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#316 (permalink)
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crankbender:
Not arguing, just learning:
All you said was great and all and will be done sooner or later, but for now, isn't it safe to say that I have "turned up my air" with my mbc etc and now I need to "turn up my fuel" by means of pump/rewire/injectors? Wouldn't that, in theory, allow the ECU to realize that ratio of fuel/air are correct thus eliminating the need to trick it?
It just seems that if you proportionately increase both air and fuel, you would never need to "trick" the ECU.
scrcco:
if a bigger turbo isn't for a long while, should I just keep the injectors I've got (stock), or can I upgrade them before a bigger turbo?
Discuss amongst yourselves.
Thanks,
Boz
Quote:
Originally posted by crankbender
Fuel cut is not imposed by actual fuel rates but rather by the ECU based on air flow. The air flowing needs a certain ammount of fuel and the ECU cuts it when it decides it can't give that much fuel.
In general the only real way to get rid of fuel cut is to trick the ecu, replace it with a standalone, or reprogramm it.
Ways to do the first option
S-AFC
gm maf
2g maf
etc etc etc (just make sure you have the increased fuel flow capacity to match)
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03-13-2004, 01:45 AM
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#317 (permalink)
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DSM Wiseman
From: houston, Texas
Registered: Apr 2002
Posts: 1,240
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Quote:
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All you said was great and all and will be done sooner or later, but for now, isn't it safe to say that I have "turned up my air" with my mbc etc and now I need to "turn up my fuel" by means of pump/rewire/injectors? Wouldn't that, in theory, allow the ECU to realize that ratio of fuel/air are correct thus eliminating the need to trick it?
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The ECU can not measure fuel pressure and flow rates it only sees the air. It also does not look at the O2 sensor during WOT operation (open loop).
This means that even if you have 900-0000000 cc injectors and 50000000000 psi of fuel pressure if you put that much air past the mas it will impose fuel cut even tho you are drowning in fuel.
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03-13-2004, 01:48 PM
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#318 (permalink)
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DSM Wiseman
From: Austin, Arizona
Registered: May 2002
Posts: 3,312
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Quote:
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In general the only real way to get rid of fuel cut is to trick the ecu, replace it with a standalone, or reprogramm it
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Or get an HKS fuel cut defender
NOTE: I would have never posted this if I didn't see crank here. I am now an avid follower/smart-ass...
____________________________
Austin
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03-13-2004, 02:38 PM
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#319 (permalink)
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Proven Member
From: Texas, Texas
Registered: Oct 2002
Posts: 1,190
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www.dsmchips.com
Get the fuel cut elimination option ( along with whatever else he offers ) and you should be good to go. Only 90$ too. 
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03-13-2004, 02:55 PM
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#320 (permalink)
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DSM Wiseman
From: Austin, Arizona
Registered: May 2002
Posts: 3,312
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:eek: another option 
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Austin
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03-13-2004, 08:53 PM
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#321 (permalink)
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DSM Wiseman
From: houston, Texas
Registered: Apr 2002
Posts: 1,240
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hey now getting rid of the fuel cut through reprogramming is the same as fooling the ecu.
Yeah before I went with DSMchips i would get the reprogrammer and burn my own chips....not that his arn't good but if you go the other route you can update to new injectors for like nothing.
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03-13-2004, 09:06 PM
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#322 (permalink)
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Proven Member
From: Texas, Texas
Registered: Oct 2002
Posts: 1,190
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Quote:
Originally posted by crankbender
hey now getting rid of the fuel cut through reprogramming is the same as fooling the ecu.
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Fooling the ECU is done by altering the inputed values before they are received by the ECU. What the DSMchip does is remove the line coding for the "fuel cut". Not so much fooling as, well, reprogramming. The ECU is now not ca | |