Thread: AFPR problem.

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2013-08-09 11:42:26

#11

p11primera Online/offline status of p11primera is unknown

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No just AFPR,stock fpr have been removed altogether.

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2013-08-09 15:46:53

#12

LAM-PARK

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So is the engine running hot or does it have a high A/F ratio (16:1) ???

Originally Posted by p11primera

With what you have listed in your signature for mods Intake/Header/Exhaust & Cams you should not be having these problems.

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2013-08-09 16:02:48

#13

BenFenner

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Originally Posted by p11primera

But with stock FPR,i had no drivabilty problems,just the dyno sheet showing the afr's to be in the high 16s across the midrange,so i brought a AFPR to hopefully bring the afr's near to spec and gain a little power to.

This is where things went wrong. You can't trust a dyno's AFR gauge. Never. You were likely not lean at all. Put the damn stock FPR back in.

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2013-08-09 18:12:32

#14

p11primera Online/offline status of p11primera is unknown

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Originally Posted by LAM-PARK

So is the engine running hot or does it have a high A/F ratio (16:1) ???

Originally Posted by p11primera
P11 Primera gt,with fuji header,2.5 inch catback,full cai with apexi filter,S3r cams,High performance HT leads,s/s brake lines,drilled and grooved brake disks all round,rear trailing arm poly bushes,arb poly bushes,drop link poly bushes,poly exhaust hangers,poly front and rear engine mounts,poly shifter bush,steering rack poly bushes,and much more to come !!!

With what you have listed in your signature for mods Intake/Header/Exhaust & Cams you should not be having these problems.

It's at 16.5 to 1 on the dyno sheet,i posted this up a few weeks ago on here.

- - - Updated - - -

Originally Posted by BenFenner

Originally Posted by p11primera
But with stock FPR,i had no drivabilty problems,just the dyno sheet showing the afr's to be in the high 16s across the midrange,so i brought a AFPR to hopefully bring the afr's near to spec and gain a little power to.
This is where things went wrong. You can't trust a dyno's AFR gauge. Never. You were likely not lean at all. Put the damn stock FPR back in.

But my spark plugs was very white.

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2013-08-09 18:32:44

#15

BenFenner

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Originally Posted by p11primera

But my spark plugs was very white.

Did you check them after shutting the engine down mid-dyno pull? Otherwise, I'm dubious as to how reliable that reading is. Spark plugs tend to "report" the latest operating conditions of the engine.

I still think you should put the stock FPR back in and if you are running lean, address the cause of the problem first. It might be a MAF issue, etc.

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2013-08-09 18:45:23

#16

p11primera Online/offline status of p11primera is unknown

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When that's the thing,i thought i was running lean just due to the cams etc fitted,what else can cause a very lean condition ?

Everything else looks to be in good condition.

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2013-08-09 18:56:08

#17

unijabnx2000 Online/offline status of unijabnx2000 is unknown

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Like Ben said, if the maf isnt seeing all the air, it only adds fuel for the air it "sees".

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2013-08-09 18:58:40

#18

Doctor G

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Buy a wideband. Only way to be sure what's going on. It's a great investment.

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2013-08-09 19:11:25

#19

p11primera Online/offline status of p11primera is unknown

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But i still don't understand why i can't adjust fuel pressure with a AFPR,i thought that was the reason there are for !

Tbh i don't know what to do,at the moment it is a pig to drive sometimes.

Last edited by p11primera on 2013-08-09 at 19-16-15.

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2013-08-09 19:14:42

#20

lynchfourtwenty Online/offline status of lynchfourtwenty is unknown

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Adjusting the fuel pressure to fix your tune os not the way to go that is not what they are designed for.

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