10-13-2014, 10:33 PM
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#1
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Registered User
Join Date: May 2012
Location: Dover,Kent,England
Posts: 78
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yes that was my thinking with it being fine for the 2.5, i'm trying to solve a flat spot ive got at 5400 rpm.
When i disconnected the MAF the flat spot had gone, the MAF's ok as after the flat spot it pulls hard again to the redline
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10-15-2014, 05:41 AM
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#2
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Registered User
Join Date: Dec 2006
Location: shoreham, ny
Posts: 1,619
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ipd plenum will fix your flatspot
__________________
996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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10-15-2014, 08:54 AM
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#3
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Track rat
Join Date: Nov 2006
Location: Southern ID
Posts: 3,701
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Quote:
Originally Posted by whitecliffs
yes that was my thinking with it being fine for the 2.5, i'm trying to solve a flat spot ive got at 5400 rpm.
When i disconnected the MAF the flat spot had gone, the MAF's ok as after the flat spot it pulls hard again to the redline
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Still sounds like a fouled MAF. I had a similar problem with a flat spot and no error codes yet. I cleaned the MAF and it improved for a while but came back over time with codes. Replacing the MAF was the cure.
I suspect the 987 airbox on a 2.5L may improve performance slightly above 6krpm but may sacrifice some torque in the 4-6k range. A tradeoff worth taking??? Depends on your goals I guess.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
Last edited by Topless; 10-15-2014 at 08:58 AM.
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10-15-2014, 09:38 AM
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#4
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Registered User
Join Date: Aug 2009
Posts: 1,466
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You realize the 987 air box probably can't be installed without removing the motor. At the very least you will have to take out half the intake manifold. Next the MAF tube is significantly larger than the 986 I believe it is 90MM. Without some programing your air fuel mix will probably be off.
__________________
2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
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10-15-2014, 10:32 AM
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#5
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Registered User
Join Date: May 2012
Location: Dover,Kent,England
Posts: 78
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Quote:
Originally Posted by JAAY
ipd plenum will fix your flatspot
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I already have a pedro techno torque fitted
[QUOTE=Topless;421741]Still sounds like a fouled MAF. I had a similar problem with a flat spot and no error codes yet. I cleaned the MAF and it improved for a while but came back over time with codes. Replacing the MAF was the cure.
The MAF is only a month old and a genuine Bosch one, if the MAF was faulty wouldn't it show up in other areas and not just at 5400rpm because once passed 5600 it pull clean and hard again everytime
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10-15-2014, 11:47 AM
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#6
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Track rat
Join Date: Nov 2006
Location: Southern ID
Posts: 3,701
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[QUOTE=whitecliffs;421750] I already have a pedro techno torque fitted
Quote:
Originally Posted by Topless
Still sounds like a fouled MAF. I had a similar problem with a flat spot and no error codes yet. I cleaned the MAF and it improved for a while but came back over time with codes. Replacing the MAF was the cure.
The MAF is only a month old and a genuine Bosch one, if the MAF was faulty wouldn't it show up in other areas and not just at 5400rpm because once passed 5600 it pull clean and hard again everytime
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If it is brand new Bosch and clean it is probably ok. A flat spot in the rpm range while running fine everywhere else is a common symptom of a failing MAF. It rarely affects the entire upper range unless it is completely fouled.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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10-19-2014, 12:05 PM
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#7
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Registered User
Join Date: May 2012
Location: Dover,Kent,England
Posts: 78
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Installed the standard airbox this weekend and the flat spot as gone, so looks like it was my after market air filter it didn't like
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Lil Red
2009 Porsche Cayman 2.9L
