RE: 94 FMII Cutting out at high boost/rpm

Mon, 02 Aug 2010 21:14:10 -0700

THAT brings back memories.

yes, I got a liquid-filled guage at ww graingers for like $10, and several feet of fuel hose. IMPORTANT- I wrapped the guage in electrical tape so it wouldnt crack the windshield on a bump.

it was a great tool while tuning my AFPR



-------- Original Message --------
Subject: RE: 94 FMII Cutting out at high boost/rpm
From: "Larry Alster" <[email protected]>
Date: Mon, August 02, 2010 5:14 pm
To: "'Robert M'" <[email protected]>,
<[email protected]>

Back in the old days with the AFPR the solution was to tape the gauge to the windshield where you could see it.
 
 
 
 
Larry Alster
 
91 Miata  White Knight
92 Miata  Silver Bullet
92 Miata  Honey B
04 MSM MX-5 Whooosh
06 WRX STi Subie
 
From: Robert M [mailto:[email protected]]
Sent: Monday, August 02, 2010 8:08 PM
To: [email protected]; [email protected]
Subject: RE: 94 FMII Cutting out at high boost/rpm
 

   Certainly fits the issue.   How to check?  Run it hard with the FP gage in place and see if the behavior is odd under boost when warm?

Not thrilled with the idea of all that additional fuel line in there on the road but don't know what else to do, really....
From: [email protected]
To: [email protected]; [email protected]
Subject: RE: 94 FMII Cutting out at high boost/rpm
Date: Mon, 2 Aug 2010 18:37:45 -0400
Pump slowing up after it’s been running awhile?
 
 
 
 
Larry Alster
 
91 Miata  White Knight
92 Miata  Silver Bullet
92 Miata  Honey B
04 MSM MX-5 Whooosh
06 WRX STi Subie
 
From: [email protected] [mailto:[email protected]] On Behalf Of Robert M
Sent: Monday, August 02, 2010 6:14 PM
To: [email protected]
Subject: 94 FMII Cutting out at high boost/rpm
 
  Greets!  My 94 FMII car (installed circa 2000, RC550's, 12psi, BBBT, original fuel pump) is cutting out under high boost/high rpm conditions.  I sent a datalog to FM and Jeremy replied,

"Your ATS & CTS look fine. You've got plenty of injector on-time. So, if you're leaning out I'd have a look at your fuel pressure to see if your pump is bad or filter is clogged. Should be running around 35 psi at idle & around 45 psi if you pop the vacuum hose off the regulator. In boost it raises pressure 1:1. " 

I finally checked the pressure today and got 35 idle/44-ish with the vac source removed.  Max pressure (checked with the fuel line output blocked) was ~77psi.

I did notice that the behavior doesn't start immediately, but rather appears once the car is good and warmed up.

What's the next step?  I probably am due for a filter, but it seems somewhat unlikely that I'd get good numbers in the garage with a clogged filter, no?

All input welcome- thanks in advance!
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