car sputters when accelerating to high speeds - SRT Forums - SRT4, SRT6, SRT8, SRT10 & Dodge Forum
 
 


Go Back   SRT Forums - SRT4, SRT6, SRT8, SRT10 & Dodge Forum > SRT-4 Technical Discussion > Performance Modifications

SrtForums.com is the premier Dodge SRT Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 05-09-2009, 08:01 PM   #1 (permalink)
SRTforums Member
 
jessebeachusmc's Avatar
 
Join Date: Feb 2009
Member Number: 70610
Location: SoCal
Posts: 1,468
Default 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
__________________


AGP borg warner s256 powered
jessebeachusmc is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 05-09-2009, 08:04 PM   #2 (permalink)
Forum Moderator
2011 Calendar Car
 
CONROY's Avatar
 
Join Date: Sep 2006
Member Number: 46401
Location: Pittsburgh PA
Posts: 15,673
Lifetime Premium Member
Default

why the fuck do you find it necessary to even be going at the top of 4th/5th on the street
CONROY is offline   Reply With Quote
Old 05-09-2009, 08:04 PM   #3 (permalink)
Forum Moderator
2011 Calendar Car
 
CONROY's Avatar
 
Join Date: Sep 2006
Member Number: 46401
Location: Pittsburgh PA
Posts: 15,673
Lifetime Premium Member
Default

and as for not getting enough fuel, 625's are too big for your mods.
CONROY is offline   Reply With Quote
Old 05-09-2009, 08:29 PM   #4 (permalink)
SRTforums Member
 
jessebeachusmc's Avatar
 
Join Date: Feb 2009
Member Number: 70610
Location: SoCal
Posts: 1,468
Default

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.
__________________


AGP borg warner s256 powered
jessebeachusmc is offline   Reply With Quote
Old 05-09-2009, 08:34 PM   #5 (permalink)
SRTforums Member
 
hercfe's Avatar
 
Join Date: Oct 2004
Member Number: 19255
Location: GreensburgPA
Posts: 4,547
Default

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?
hercfe is offline   Reply With Quote
Old 05-11-2009, 05:44 PM   #6 (permalink)
SRTforums Member
 
Join Date: Dec 2008
Member Number: 69371
Location: Kent
Posts: 124
Default

Quote: 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.
srt_noob is offline   Reply With Quote
Old 05-11-2009, 05:47 PM   #7 (permalink)
SRTforums Member
 
Adionik's Avatar
 
Join Date: Feb 2007
Member Number: 51197
Location: Slow
Posts: 18,432
Default

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
Adionik is offline   Reply With Quote
Old 05-11-2009, 07:01 PM   #8 (permalink)
SRTforums Member
 
Blue_Streek's Avatar
 
Join Date: Oct 2006
Member Number: 47162
Location: South San Diego
Posts: 2,626
Default

Quote: 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?
__________________
ALUMNI CSR905:::2002

Last edited by Blue_Streek; 05-11-2009 at 07:04 PM.
Blue_Streek is offline   Reply With Quote
Old 05-12-2009, 04:44 PM   #9 (permalink)
SRTforums Member
 
Srtbullet05's Avatar
 
Join Date: Jul 2008
Member Number: 65354
Location: Bel Air, MD
Posts: 71
Default

Check to see if your cylinders are working properly.
Srtbullet05 is offline   Reply With Quote
Old 05-14-2009, 07:38 PM   #10 (permalink)
SRTforums Member
 
jessebeachusmc's Avatar
 
Join Date: Feb 2009
Member Number: 70610
Location: SoCal
Posts: 1,468
Default

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.
__________________


AGP borg warner s256 powered
jessebeachusmc is offline   Reply With Quote
Old 05-20-2009, 03:59 PM   #11 (permalink)
SRTforums Member
 
Srtbullet05's Avatar
 
Join Date: Jul 2008
Member Number: 65354
Location: Bel Air, MD
Posts: 71
Default

check the cylinders. i ahd the same problem
Srtbullet05 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 06:33 PM.



(C) SRTforums.com

Search Engine Friendly URLs by vBSEO 3.3.2