Need part# for Bosch 3 bar FPR
06-11-2002, 01:34 PM
#1
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Need part# for Bosch 3 bar FPR
I 'm not getting any response on the 944 turbo forum, so i will try here. My newly installed digital air fuel meter last night said 0.75 When I did a WOT burst in fourth gear. I want to replace the stock 2.5 unit with the 3 bar. I have a boost enhancer on the car with chips. My local foreign parts guy can usually get me anything and i would rather drive to him than do mail order.
John
John
06-11-2002, 04:40 PM
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[quote]Originally posted by Alpine951:
<strong>My local foreign parts guy can usually get me anything and i would rather drive to him than do mail order.</strong><hr></blockquote>
Maybe if you change your mind about this...
Just kidding
EDIT: BOSCH - 0.280.160.249
Honestly, if you're interested in tuning for the correct A/F then you'd be better off with an adjustable regulator and some dyno time with a proper wideband air/fuel sensor/monitor.
Good Luck!
<strong>My local foreign parts guy can usually get me anything and i would rather drive to him than do mail order.</strong><hr></blockquote>
Maybe if you change your mind about this...
Just kidding
EDIT: BOSCH - 0.280.160.249
Honestly, if you're interested in tuning for the correct A/F then you'd be better off with an adjustable regulator and some dyno time with a proper wideband air/fuel sensor/monitor.
Good Luck!
06-11-2002, 04:53 PM
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does standard dyno time include the A/f metering service. how is it measured? stick a wideband in the car that hooks up to both the computer and the DME or whatever??
Jason
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06-11-2002, 05:49 PM
#5
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I dont know if its standard or not...
The Porsche shop that I looked at for dyno runs didn't charge extra (but they were already charing $100..hehe).
That as opposed to $75 + $15 for a wideband from a standard tune shop.
They stick a wide band O2 sensor in the exhaust of the car...nothing to do with your DME/KLR. That wide band O2 sensor then reads to the dyno machine and produces a plot like this one:
<a href="http://members.rennlist.com/adrial/dyno2low.jpg" target="_blank">http://members.rennlist.com/adrial/dyno2low.jpg</a>
The Porsche shop that I looked at for dyno runs didn't charge extra (but they were already charing $100..hehe).
That as opposed to $75 + $15 for a wideband from a standard tune shop.
They stick a wide band O2 sensor in the exhaust of the car...nothing to do with your DME/KLR. That wide band O2 sensor then reads to the dyno machine and produces a plot like this one:
<a href="http://members.rennlist.com/adrial/dyno2low.jpg" target="_blank">http://members.rennlist.com/adrial/dyno2low.jpg</a>
06-11-2002, 05:51 PM
#6
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Yep, paying for dyno time is useless unless you're monitoring your air-fuel ratio. Usually they stick a Horiba exhaust-gas analyzer in the tailpipe and measure the engine's output. Then you go back into your engine and make adjustments to get a clean air-fuel curve. This adjustment can be in the way of fuel-pressure, custom-burned chips, turning-***** on the ARC2, entering new values into your laptop & downloading, whatever...
06-11-2002, 05:56 PM
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It's not generally included, but for instance costs me only $15 added to a $90 dyno session (less if part of a group of 5 or more). The A/F is measured through a probe in the tailpipe... before any naysayers say that this is too far down the path to be effective (lag), consider that while on the dyno your RPM's do_not increase very quickly - the rise is slow but steady, so the measurement is surely accurate enough for datapoints of analysis and tuning.
The use of the standard A/F meter with a standard O2 sensor is okay for gross calculations and will inform you if something is terribly awry, but is not a generally accepted measure for use in fine tuning. Even still, you would need an injector duty cycle measure to add to this.
Charges for Dyno time can vary widely depending on what you are asking for - Dyno time for you to do the tuning is relatively cheap... union-like hourly rates can be expected if you want the shop to "dial-in" the system... the more complicated the system, the more hourly wage they earn. Specialists in dyno-tuning do_not always coincide with shops with dynos... add aftermarket parts, especially SEM, to that mix and it's rarer still. Best to ask a bunch of questions before running - be willing to travel, and take notes.
Skip
The use of the standard A/F meter with a standard O2 sensor is okay for gross calculations and will inform you if something is terribly awry, but is not a generally accepted measure for use in fine tuning. Even still, you would need an injector duty cycle measure to add to this.
Charges for Dyno time can vary widely depending on what you are asking for - Dyno time for you to do the tuning is relatively cheap... union-like hourly rates can be expected if you want the shop to "dial-in" the system... the more complicated the system, the more hourly wage they earn. Specialists in dyno-tuning do_not always coincide with shops with dynos... add aftermarket parts, especially SEM, to that mix and it's rarer still. Best to ask a bunch of questions before running - be willing to travel, and take notes.
Skip
