# safc tuning sr, coughing above 5g and lean decel
**URL:** https://forums.speedlife.net/t/safc-tuning-sr-coughing-above-5g-and-lean-decel/161096
**Category:** SON240sx Automotive
**Created:** [October 3, 2010, 9:06pm UTC](https://forums.speedlife.net/t/safc-tuning-sr-coughing-above-5g-and-lean-decel/161096 "2010-10-03T21:06:45Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@drjeffreys](https://forums.speedlife.net/u/drjeffreys)
#### Post date: [October 3, 2010, 9:06pm UTC](https://forums.speedlife.net/t/safc-tuning-sr-coughing-above-5g-and-lean-decel/161096/1 "2010-10-03T21:06:45Z")
just got my car out, has a jim wolf tune ecu for redtop sr with z32maf and 550cc inj. Now running a t28r at 10psi and full turbo back + recirc’d synapse bov. I am using an apexi safc to tune the car a little on the safer side, 14-15 idle 12-13 cruise 10.5-11.5 WOT… I am having an issue with the car burping a little at and above 5k… ngk platinums gapped to .44(correct for my power and boost?) also decel max’s out my aem wideband gauge into the lean (18+afr)… i know its supposed to be lean on decel but thats too lean no? is there any way to fix this?
looking to get a tune this week, if not, need to fix these things… any information would be appreciated… thanks.
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### Author:  [@Happy240sx](https://forums.speedlife.net/u/Happy240sx)
#### Post date: [October 4, 2010, 4:19am UTC](https://forums.speedlife.net/t/safc-tuning-sr-coughing-above-5g-and-lean-decel/161096/2 "2010-10-04T04:19:08Z")
That is too rich at WOT and cruise.
Ditch the platnums and get BKR7E, gap to .028
Don’t worry about the decel. It’s fine.
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### Author:  [@drjeffreys](https://forums.speedlife.net/u/drjeffreys)
#### Post date: [October 4, 2010, 10:13am UTC](https://forums.speedlife.net/t/safc-tuning-sr-coughing-above-5g-and-lean-decel/161096/3 "2010-10-04T10:13:32Z")
I’m not understanding why its healthy to be that lean under decel… Could you explain that? Ill try those plugs tonight, also I sent you an email regarding a tune… Thanks
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### Author:  [@Silvia\_Drift](https://forums.speedlife.net/u/Silvia_Drift)
#### Post date: [October 4, 2010, 1:08pm UTC](https://forums.speedlife.net/t/safc-tuning-sr-coughing-above-5g-and-lean-decel/161096/4 "2010-10-04T13:08:21Z")
> [@drjeffreys](#):
>
> I’m not understanding why its healthy to be that lean under decel… Could you explain that? Ill try those plugs tonight, also I sent you an email regarding a tune… Thanks
On decel, the injectors shut off since there is no load. It is normal for most fuel injected cars.
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### Author:  [@drjeffreys](https://forums.speedlife.net/u/drjeffreys)
#### Post date: [October 4, 2010, 3:50pm UTC](https://forums.speedlife.net/t/safc-tuning-sr-coughing-above-5g-and-lean-decel/161096/5 "2010-10-04T15:50:01Z")
yes, i understand that… saves fuel mileage… aswell as there being no reason to be adding fuel while deccelerating… but the motor is still running at +18 or more afr… even if i put it in neutral and coast, the car does this, i have read many places that even under decel the motor should not see this much lean… what afr should i be reaching for at cruise and wot?
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### Author:  [@drjeffreys](https://forums.speedlife.net/u/drjeffreys)
#### Post date: [October 4, 2010, 8:30pm UTC](https://forums.speedlife.net/t/safc-tuning-sr-coughing-above-5g-and-lean-decel/161096/6 "2010-10-04T20:30:10Z")
wowza… gapped new plugs to specs… no stumbling what so ever… allowed me to tune a little more, now making a retarded amount more power… thanks for the advice…
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### Author:  [@veloz](https://forums.speedlife.net/u/veloz)
#### Post date: [October 4, 2010, 8:48pm UTC](https://forums.speedlife.net/t/safc-tuning-sr-coughing-above-5g-and-lean-decel/161096/7 "2010-10-04T20:48:26Z")
I’m playing around with the BKR8E-IX plugs.
So far, car is liking it.
Car was breaking up with the BKR7E’s after 20 min sessions. I am running a bit more than 10psi though.
That .028 Gap is perfect for most SR’s.
Stupid question but why are you tuning a JWT Tune? Is it that much off on your setup?
What are the numbers on the stock tune like?
This feels like 7 years ago but what are your SAFC setting like? Even JWT tunes are slightly rich under WOT
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### Author:  [@drjeffreys](https://forums.speedlife.net/u/drjeffreys)
#### Post date: [October 4, 2010, 9:16pm UTC](https://forums.speedlife.net/t/safc-tuning-sr-coughing-above-5g-and-lean-decel/161096/8 "2010-10-04T21:16:50Z")
the car ran great on just the jwt ecu with the t25, garbage fmic, almost stock exhaust, at 14 psi(reason why the turbo ate shit and is now a t28r)… with everything ive dumped in it since owning it, idle and cruise was pretty lean but i havnt touched anything above 5thousand on the safc… still at 0’s… although im at around +35 correction at idle, 28 at 2 gs… 20ish at 3… 12 at 4… 5 at 5… not sure why, but its working so far… im assuming its from the velocity change of the bigger turbo pushing more air… also think it was leaking quite a bit of boost with old intercooler, piping, and plumbing… the one thing i did notice was that previous owner had retarded timing 3-4 degrees from stock spec, instead of using the safc… anyways, the safc is temporary… needed to drive it before summers over…
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### Author:  [@Pants](https://forums.speedlife.net/u/Pants)
#### Post date: [October 4, 2010, 10:49pm UTC](https://forums.speedlife.net/t/safc-tuning-sr-coughing-above-5g-and-lean-decel/161096/9 "2010-10-04T22:49:44Z")
bkr7e is what i use with 20psi making 420whp
go to dan like i said man
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### Author:  [@veloz](https://forums.speedlife.net/u/veloz)
#### Post date: [October 5, 2010, 11:29am UTC](https://forums.speedlife.net/t/safc-tuning-sr-coughing-above-5g-and-lean-decel/161096/10 "2010-10-05T11:29:35Z")
^^ And they are the best for MOST SR setups out there. Are the running the .028 gap Pete?
OP - Why are you throwing so much fuel into the car at low load?
I would probably zero out your settings for now, and check for boost leaks and other such things.