|
|
Photo Gallery | $ Donations $ | Register | FAQ | Social Groups | Calendar | Search | Today's Posts | Mark Forums Read |
Power Adders Superchargers, Turbos, Nitrous, etc... |
|
Thread Tools | Display Modes |
06-03-2017, 05:18 PM | #1 |
Registered User
Join Date: Jan 2004
Location: Round Rock, TX
Posts: 950
|
car runs lean under boost
Car runs fine cruising around idles fine but above 3lbs of boost seems to run extremely lean it will start to backfire and sputter I think thats about the time the boost a pump is suppose to kick in other than than on fuel I'm running 80lb inj and Aeromotive 325lph fuel pump. I can rev it up to redline if I keep the boost at 3lbs or less but above that regardless of rpms seems lean. Could it be a bad bov? I have the vortech mondo. Thanks.
Last edited by jv7; 06-03-2017 at 06:50 PM. |
06-03-2017, 05:23 PM | #2 |
finally paid for
Join Date: Nov 2004
Location: Ypsilanti Twp, Mi
Posts: 4,077
|
Re: car runs lean under boost
definitely not getting fuel for sure. I switched to full return style because of such issues with boost a pump. I would make sure that is working but with seeing some data log it would be hard to self diag
__________________
2004 mach 1-turbo build in progress.. Fast xfi 2.0 OLD combo- 826rwhp/720 trq -100 shot NX 9.13@154 on 100 shot NEW- in progress... |
06-05-2017, 11:20 PM | #3 |
Mach-T
Join Date: Jun 2004
Location: DFW
Posts: 2,865
|
Re: car runs lean under boost
overly simple, but check your fuel filter.
__________________
Darrell Black '04 Mach 1 Track Times (bone-stock w/drs):60 ft - 1.90 | 1/8 - 8.67 (100 shot,E85,4:10s,Street tire):60 ft - 1.67 | 1/8 - 7.88 New build - 750rwhp; not track tested (yet) Mods: Build Log Paint&Body Tuned by Manny @ HPP |
06-09-2017, 03:29 PM | #4 |
Registered User
Join Date: Jan 2004
Location: Round Rock, TX
Posts: 950
|
Re: car runs lean under boost
Already did that. Cleaned maf and kn filter no change.
|
06-09-2017, 03:55 PM | #5 |
700 HP Mach
Join Date: Nov 2003
Location: Orlando, FL
Posts: 8,384
|
Re: car runs lean under boost
Is it lean or is it bad spark blow out?
Sounds like you need to get a wideband on there
__________________
03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc... '12 F150 FX2 Supercrew with Ecoboost daily beater |
06-10-2017, 12:48 PM | #6 |
Registered User
Join Date: May 2007
Location: FS, TX
Posts: 796
|
Re: car runs lean under boost
Id get a wideband right away to see how lean your going, then adjust from there with a handheld tuner. also check all the hoses for cracks and such, maybe there is air getting in there past the MAF. A fuel pressure gauge would help alot to to diagnose stuff too. At 3 psi i think the pump your running should be fine even without the BAP. If your running a off the shelf tune, id get it to a tuner and get a custom tune right away.
Gauges you should always have if your boosted. A/F gauge Fuel Press Gauge Oil Press gauge Boost/ Vac Gauge Water temp gauge ( even if not boosted )
__________________
2003 Mustang Mach 1 (Bought 11/16/2005) Eaton Swapped @7psi (On 10/24/15) 13.2@107 (Bone Stock Run) 2000 3.8 Mustang
Sold But Will Never Be Forgotten |
06-13-2017, 08:42 AM | #7 |
Registered User
Join Date: Jan 2004
Location: Round Rock, TX
Posts: 950
|
Re: car runs lean under boost
What would cause spark blowout? It started happening around the time I changed my plugs.
|
06-13-2017, 08:52 AM | #8 |
700 HP Mach
Join Date: Nov 2003
Location: Orlando, FL
Posts: 8,384
|
Re: car runs lean under boost
weak coils and/or plugs with too big of a gap. If they werent gapped tight enough for your boost level the misfiring/blowout may have fouled them since then
__________________
03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc... '12 F150 FX2 Supercrew with Ecoboost daily beater |
06-13-2017, 02:15 PM | #9 |
Registered User
Join Date: Jan 2004
Location: Round Rock, TX
Posts: 950
|
Re: car runs lean under boost
I think it is spark blowout. I asked my mechanic who installed them if he gapped them at 32 and he said he thought I said 42. So you would suggest to get new plugs instead of regapping the ones I have now? I have a d1 with max 16lbs boost should I gap them lower then 32?
|
06-13-2017, 03:30 PM | #10 |
700 HP Mach
Join Date: Nov 2003
Location: Orlando, FL
Posts: 8,384
|
Re: car runs lean under boost
if it was working at 32 before, Id leave em at 32. My understanding is you want to run the biggest gap possible without getting spark blowout to make the most power. As for new plugs its hard to say they might be fine. If youre just running NGKs or something @ $20 a set or less Id just buy new ones and be done with it personally
__________________
03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc... '12 F150 FX2 Supercrew with Ecoboost daily beater |
06-14-2017, 08:38 AM | #11 |
Registered User
Join Date: Jan 2004
Location: Round Rock, TX
Posts: 950
|
Re: car runs lean under boost
Any plug recommendations? Ngk tr6 or tr55's?
|
06-14-2017, 10:27 AM | #12 |
Can't be bridled
Join Date: Sep 2007
Location: Texas
Posts: 7,005
|
Re: car runs lean under boost
New Tr6 @ .028-.032 is what I would do. Maybe start at 28 and work your way more open until it blows out and then gap them down just a hair until it's not blowing out anymore. If that didn't fix it and the coils are still originals, id get a new set of gt500 coils from AM and use the reg discount and go from there. It's probably getting about time for these cars to do that anyways.
__________________
2004 Mach 1 #6956 5spd w/IUP Eaton swap, longtubes, built 3.73 SRA 452hp/409tq dynojet🏁 |
06-14-2017, 04:45 PM | #13 | |
Mach-T
Join Date: Jun 2004
Location: DFW
Posts: 2,865
|
Re: car runs lean under boost
Quote:
__________________
Darrell Black '04 Mach 1 Track Times (bone-stock w/drs):60 ft - 1.90 | 1/8 - 8.67 (100 shot,E85,4:10s,Street tire):60 ft - 1.67 | 1/8 - 7.88 New build - 750rwhp; not track tested (yet) Mods: Build Log Paint&Body Tuned by Manny @ HPP |
|
06-14-2017, 05:41 PM | #14 |
Can't be bridled
Join Date: Sep 2007
Location: Texas
Posts: 7,005
|
Re: car runs lean under boost
Definitely
__________________
2004 Mach 1 #6956 5spd w/IUP Eaton swap, longtubes, built 3.73 SRA 452hp/409tq dynojet🏁 |
06-22-2017, 11:15 PM | #15 |
Registered User
Join Date: Jan 2004
Location: Round Rock, TX
Posts: 950
|
Re: car runs lean under boost
Finally got the tr6's gapped correctly and the new fms coil packs and it runs great! Glad thats all it was I was thinking bad fuel pump, injectors or bap. Thanks for the replies.
|
06-23-2017, 08:51 AM | #16 |
700 HP Mach
Join Date: Nov 2003
Location: Orlando, FL
Posts: 8,384
|
Re: car runs lean under boost
glad that was all it was.
__________________
03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc... '12 F150 FX2 Supercrew with Ecoboost daily beater |
06-23-2017, 10:08 AM | #17 |
Can't be bridled
Join Date: Sep 2007
Location: Texas
Posts: 7,005
|
Re: car runs lean under boost
Good deal
__________________
2004 Mach 1 #6956 5spd w/IUP Eaton swap, longtubes, built 3.73 SRA 452hp/409tq dynojet🏁 |
07-03-2017, 12:12 PM | #18 |
Mach-T
Join Date: Jun 2004
Location: DFW
Posts: 2,865
|
Re: car runs lean under boost
Love it when people post back what they did to resolve the issue. Thanks and Congrats.
__________________
Darrell Black '04 Mach 1 Track Times (bone-stock w/drs):60 ft - 1.90 | 1/8 - 8.67 (100 shot,E85,4:10s,Street tire):60 ft - 1.67 | 1/8 - 7.88 New build - 750rwhp; not track tested (yet) Mods: Build Log Paint&Body Tuned by Manny @ HPP |
07-03-2017, 12:50 PM | #19 |
Can't be bridled
Join Date: Sep 2007
Location: Texas
Posts: 7,005
|
Re: car runs lean under boost
No doubt. Almost never happens though, unfortunately.
__________________
2004 Mach 1 #6956 5spd w/IUP Eaton swap, longtubes, built 3.73 SRA 452hp/409tq dynojet🏁 |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
Thread Tools | |
Display Modes | |
|
|