car sputters when accelerating to high speeds - Dodge SRT Forum
 
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post #1 of 11 (permalink) Old 05-09-2009, 09:01 PM Thread Starter
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car sputters when accelerating to high speeds

my car is sputtering and shaking a little when im in 4th and 5th at wot. it also stops accelerating when the tach gets above 6,000 rpms. Im thinking that my injectors arent delivering enough fuel and the a/f ratio is fucked up but i just want some more input before messing with anything.

mods-
borla exhaust
625cc high flow fuel injectors
k&n cia
8.5mm spark plug wires
dsp tuned to 93 perf oct. tune



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post #2 of 11 (permalink) Old 05-09-2009, 09:04 PM
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why the fuck do you find it necessary to even be going at the top of 4th/5th on the street
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post #3 of 11 (permalink) Old 05-09-2009, 09:04 PM
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and as for not getting enough fuel, 625's are too big for your mods.
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post #4 of 11 (permalink) Old 05-09-2009, 09:29 PM Thread Starter
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yes i know there to big for my setup and im not going into the 6,000 rpm range on streets in 4th or 5th it happens in 2nd and 3rd.



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post #5 of 11 (permalink) Old 05-09-2009, 09:34 PM
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change plugs/wires. gap to .035. it sounds like spark blowout. and unless your on the autobahn, theres on need for WOT in 5th.

how do you know your afr? a dsp perfect 93 octane tune isnt really a great tune as proven over and over again here, and its surely no substitute for a wideband, which it doesnt look like you have. are you sure your fuel pump is up to par? regulator good? whats your fuel pressure? and BTW, if your in cali, how are you using a 93 octane tune?
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post #6 of 11 (permalink) Old 05-11-2009, 06:44 PM
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Originally Posted by hercfe View Post
change plugs/wires. gap to .035. it sounds like spark blowout. and unless your on the autobahn, theres on need for WOT in 5th.

how do you know your afr? a dsp perfect 93 octane tune isnt really a great tune as proven over and over again here, and its surely no substitute for a wideband, which it doesnt look like you have. are you sure your fuel pump is up to par? regulator good? whats your fuel pressure? and BTW, if your in cali, how are you using a 93 octane tune?
cali sells 93 instead of 92 like most areas..
Sounds like you don't have an wideband, so i would consider looking into a PLX or an innovate or something that allows to read your AFRs during WOT pulls.

then i would recommend to take a look at our Fuel pump rewire Kit to keep fuel pump voltage at 12.0 in higher rpms.
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post #7 of 11 (permalink) Old 05-11-2009, 06:47 PM
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If your DSP isn't rescaled for those injectors, the 93 tune isn't going to do ANYTHING fuel wise and you're choking the shit out of your pistons with fuel

My car was doing the exact same thing in 4th and 4th only...AFR's were below 10.0's
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post #8 of 11 (permalink) Old 05-11-2009, 08:01 PM
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Originally Posted by srt_noob View Post
cali sells 93 instead of 92 like most areas..
Sounds like you don't have an wideband, so i would consider looking into a PLX or an innovate or something that allows to read your AFRs during WOT pulls.

then i would recommend to take a look at our Fuel pump rewire Kit to keep fuel pump voltage at 12.0 in higher rpms.
WRONG...cali only gets piss 91.

a rewire will not fix this either.

lower your gap to something around .030.

if probelm still persists. change out the injectors or lower your boost.

how much boost yuo running?
and does this happen when you give the car WOT below 3k rpms?

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Last edited by Blue_Streek; 05-11-2009 at 08:04 PM.
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post #9 of 11 (permalink) Old 05-12-2009, 05:44 PM
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Check to see if your cylinders are working properly.
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post #10 of 11 (permalink) Old 05-14-2009, 08:38 PM Thread Starter
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im spiking around 18 and holding 15.It seems like its doing it in all the gears like it just kinda cuts out i guess you could say for a split second, and its laggy at wot.



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post #11 of 11 (permalink) Old 05-20-2009, 04:59 PM
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check the cylinders. i ahd the same problem
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