leaning out the a/f mixture

Oddjob · 07-01-2003, 08:07 PM

Hi,

I was wondering if there are any ways short of getting something like an super afc to lean out the a/f mixture. Would an adjustable fuel regulator work? I am looking at getting some cams, which I know will make the already rich mixture richer, and am trying to find a less expensive way than the super afc to fix it.

Thanks,
Oddjob

nitrofumesrule! · 07-01-2003, 08:18 PM

Bigger cams will want more fuel, you'll prolly be alright. As for leaning it an OEM adjustable FPR won't do much. I used the IAT trick before getting a better solution. Basically you vary a resistance on the IAT signal line to tell the engine its breathing hotter air than it is. Thus it'll lean out the mix. Down side is it retards timing also( but not much), it works best when its cold out, and you might get an SES light. It was good for about a tenth faster in the 1/8th when it worked. You'll also need a wide-band A/F guage to see what your doing. You should have one of those anyways if your into tuning your car.

eRic 02sc2 · 07-02-2003, 10:03 AM

what model and year saturn do you have? you can use a hypertech #8004 (or is it #4008? going from memory here) adjustible fpr on the 91-94 dohc saturns and it's an easy swap. 95-97 have an adjustible fpr from the factory that you can use a safety/tamper torx bit to adjust. on 98-02 well... good luck.

Oddjob · 07-02-2003, 10:47 AM

Hi,

It is a 1994 sl2. I was thinking about putting on a 95-97 fpr, but I does anyone know if I would have to put in a new fuel rail or if the newer model fpr would just bolt in?

Thanks,
Oddjob

nitrofumesrule! · 07-02-2003, 11:03 AM

Not sure, but I do have a whole new intake manifold powdercoated silver, with the adj. FPR and fuel rail for sale for $100.

eRic 02sc2 · 07-02-2003, 12:47 PM

the 95-97 fpr will not work on your 94. get the hypertech adjustible fpr. it's a direct swap.

Oddjob · 07-02-2003, 09:30 PM

Hi,

Do you know who sells the hypertech adjustable fpr for the 94 saturns?

Thanks,
Tim

eRic 02sc2 · 07-03-2003, 09:20 AM

ramchargers, summit, jegs. places like that.
it's hypertech fpr #4008

Oddjob · 07-03-2003, 10:40 AM

thanks for all the help.

Tim

07-01-2003, 08:07 PM	#1
Oddjob Member Join Date: Aug 2002 Posts: 80	leaning out the a/f mixture Hi, I was wondering if there are any ways short of getting something like an super afc to lean out the a/f mixture. Would an adjustable fuel regulator work? I am looking at getting some cams, which I know will make the already rich mixture richer, and am trying to find a less expensive way than the super afc to fix it. Thanks, Oddjob

07-02-2003, 10:03 AM	#3
eRic 02sc2 Super Member Join Date: Feb 2000 Location: Closed Course. Professional Driver. Posts: 14,542 eRic 02sc2's Photos	what model and year saturn do you have? you can use a hypertech #8004 (or is it #4008? going from memory here) adjustible fpr on the 91-94 dohc saturns and it's an easy swap. 95-97 have an adjustible fpr from the factory that you can use a safety/tamper torx bit to adjust. on 98-02 well... good luck. ... eRic 02sc2 DR SCCA Solo 2001,2002 1st DSP WHRRi 2007,2010 Fun Run 1st DR SCCA 2008 Triathalon 1st PF DR SCCA Solo 2009 2nd ST DR SCCA Solo 2010 1st ST Crutchfield: pkeqe-6j8e3-d2qqe

07-02-2003, 11:03 AM	#5
nitrofumesrule! Member Join Date: Jun 2002 Location: Louisville Posts: 264 nitrofumesrule!'s Photos	Not sure, but I do have a whole new intake manifold powdercoated silver, with the adj. FPR and fuel rail for sale for $100. Last edited by nitrofumesrule!; 07-02-2003 at 11:13 AM.

07-02-2003, 12:47 PM	#6
eRic 02sc2 Super Member Join Date: Feb 2000 Location: Closed Course. Professional Driver. Posts: 14,542 eRic 02sc2's Photos	the 95-97 fpr will not work on your 94. get the hypertech adjustible fpr. it's a direct swap. ... eRic 02sc2 DR SCCA Solo 2001,2002 1st DSP WHRRi 2007,2010 Fun Run 1st DR SCCA 2008 Triathalon 1st PF DR SCCA Solo 2009 2nd ST DR SCCA Solo 2010 1st ST Crutchfield: pkeqe-6j8e3-d2qqe

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07-01-2003, 08:18 PM	#2
nitrofumesrule! Member Join Date: Jun 2002 Location: Louisville Posts: 264 nitrofumesrule!'s Photos	Bigger cams will want more fuel, you'll prolly be alright. As for leaning it an OEM adjustable FPR won't do much. I used the IAT trick before getting a better solution. Basically you vary a resistance on the IAT signal line to tell the engine its breathing hotter air than it is. Thus it'll lean out the mix. Down side is it retards timing also( but not much), it works best when its cold out, and you might get an SES light. It was good for about a tenth faster in the 1/8th when it worked. You'll also need a wide-band A/F guage to see what your doing. You should have one of those anyways if your into tuning your car.

07-02-2003, 10:47 AM	#4
Oddjob Member Join Date: Aug 2002 Posts: 80	Hi, It is a 1994 sl2. I was thinking about putting on a 95-97 fpr, but I does anyone know if I would have to put in a new fuel rail or if the newer model fpr would just bolt in? Thanks, Oddjob

07-02-2003, 09:30 PM	#7
Oddjob Member Join Date: Aug 2002 Posts: 80	Hi, Do you know who sells the hypertech adjustable fpr for the 94 saturns? Thanks, Tim

07-03-2003, 09:20 AM	#8
eRic 02sc2 Super Member Join Date: Feb 2000 Location: Closed Course. Professional Driver. Posts: 14,542 eRic 02sc2's Photos	ramchargers, summit, jegs. places like that. it's hypertech fpr #4008 ... eRic 02sc2 DR SCCA Solo 2001,2002 1st DSP WHRRi 2007,2010 Fun Run 1st DR SCCA 2008 Triathalon 1st PF DR SCCA Solo 2009 2nd ST DR SCCA Solo 2010 1st ST Crutchfield: pkeqe-6j8e3-d2qqe

07-03-2003, 10:40 AM	#9
Oddjob Member Join Date: Aug 2002 Posts: 80	thanks for all the help. Tim

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