KA-T sputtering bad, running bad

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GTR PrYdE
Posts: 1184
Joined: Sun Jun 05, 2005 6:02 pm
Car: 1993 Nissan 240SX, 2003 Evolution VIII

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UPDATE AT BOTTOM!!

Well I just finished goin ka-t and it will idle (hunts between 350-750rpms)

I can free rev it up to whatever rpms (kinda revs slow) (with or without maf plugged in)

I have (3) leaks. all small (1. blow thru n62 maf, 2. boost gauge line, 3. intake gasket)

The car idles decent, but gave me hell trying to drive it, anything about 1300rpms and it sputtered like hell, and didn't want to go any more, so I went thru the gears, same in all.

Will Not go above 30 mph

I UNPLUGGED the maf and it acts the same exact way( rules out it sputtering from leaning out?)

Timing was set via timing marks at TDC and setting rotor to #1 plug.

Plugs are new NGK 7 heat range gapped to .030-.032

fuel filter is new, walbro being used, fuel pressure is at 43 with the fpr unhooked.

Any insight would be helpful, thanks

Setup-

Emance tuneT3 50 trim w/ JGS mani/dp560cc top feed injectors w/ 10ohm resistorsN62 maf, blow-thru






Modified by GTR PrYdE at 3:14 PM 5/30/2008


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DevilMB3017
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There is no 'small' boost leak.

Fix them and I bet your problems start to fix themselves...

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WDRacing
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Fix leaks, get wideband.

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GTR PrYdE
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Joined: Sun Jun 05, 2005 6:02 pm
Car: 1993 Nissan 240SX, 2003 Evolution VIII

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The leaks will get fixed of course, I just didn't think they would cause the car to not let me drive in gear over 1300rpms or above 30mph

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driftin_sr20det
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Joined: Tue Oct 04, 2005 10:23 am
Car: 92 Coupe

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Sounds like my emance tune that just doesn't work for my SR. I just recently gave up on it.

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GTR PrYdE
Posts: 1184
Joined: Sun Jun 05, 2005 6:02 pm
Car: 1993 Nissan 240SX, 2003 Evolution VIII

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driftin_sr20det wrote:Sounds like my emance tune that just doesn't work for my SR. I just recently gave up on it.
Yours ran like crap?

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GTR PrYdE
Posts: 1184
Joined: Sun Jun 05, 2005 6:02 pm
Car: 1993 Nissan 240SX, 2003 Evolution VIII

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AFR's at Idle are a pig rich 9.0:1

Trying to cruise, if I give it any throttle, it was go erratic from 11:1-17:1

My injectors all show a resistance of 2.5ohms, and the idle drops when I unplgged each one. They are also top feed with 10ohm resistors

Tune?! I'm going to email Jason, but other ideas would be awesome. Thanks

Also, the car acts like it has a 2-step launch control, parked above 4500rpms and it hits 12psi!!! wtf?! this is parked free-revving

I heard the wastegate dump open for the first time

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DevilMB3017
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Sounds like tune or intake leak.

Double check everything. Including the intercooler.

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GTR PrYdE
Posts: 1184
Joined: Sun Jun 05, 2005 6:02 pm
Car: 1993 Nissan 240SX, 2003 Evolution VIII

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DevilMB3017 wrote:Sounds like tune or intake leak.

Double check everything. Including the intercooler.
intake leak as in vac/boost?

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DevilMB3017
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Joined: Thu Sep 14, 2006 7:25 am

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Now that you mention it, possibly, lol.

I was talking more like a cracked/spilt coupler or a pipe not fully on somewhere between turbo outlet and throttle body.

The weirdest reactions, from my experiences mind you, was when my coupler to my throttle body was off a bit. VERY funky things happened at idle, and it partially went away on throttle but then at WOT/high RPMs it came back...


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