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I sell the same injectors for $310 for the set (see post #109) and you save $34.36 and would be supporting the 928 Community 8>)
Welcome to Rennlist!
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Are we saying that two injectors of the same flow rate (24# @ 3bar) will flow different amounts of fuel at the same pressure depending on latency?
On a lab bench, no. But you don't drive a lab bench, and in a car latency does change the amount of fuel that gets injected.
The difference is that lab measurements (and virtually all of the specs and charts) are based on static flow-- turn on the faucet, measure how long it takes to fill a bucket.
In an engine the injectors are pulsed, and each time the injector is pulsed nothing happens for the first millisecond or so-- that's the latency, also called opening-time, dead-time, or sometimes offset. The total pulse at idle or cruising is only about 2 ms, so it can be a big effect. Change to a different injector with different opening-time and you get a different amount of fuel.
Bosch # 0 280 150 947 is the same as the Ford M9593-A302, good injectors and much discussed in this thread. That's a good choice if that's what the car is tuned for. It is not the right choice for stock chips, stick with the stock 19# injectors and get them cleaned/tested. And if you are using someone else's chips tuned for 24# injectors, then find out which 24# injectors they were tuned for.
And do what Roger says, Five-O are good folks but 928srus are great folks and Roger understands what 928's need.
If you are in doubt, send the injectors in after purchase and I will log and make the initial S4.S300s adjustment(s) for you, if needed. (Injectors must be new or freshly rebuilt and must include a set of lower S4 o-rings - Roger/928sRUs stocks them.)
Just please don't settle for stock or warmed-over 'tuning' based on stock programming...when you could have so much more.
My Ford 24lb blue tops, out of decently running car but should be checked/flow matched:
$__ plus shipping CONUS Actually lets just say SOLD shipped, CONUS.
A bag of 18 of the larger o-rings from FiveO.....SOLD shipped CONUS.
Last edited by SMTCapeCod; 11-11-2014 at 08:02 AM.
My Ford 24lb blue tops, out of decently running car but should be checked/flow matched:
$20 plus shipping CONUS Actually lets just say $25 shipped, CONUS.
A bag of 18 of the larger o-rings from FiveO.....$10 shipped CONUS.
I just wanted to say a big "Thank you" to you all - This is a brilliant thread, and gave me the inspiration to test modern injectors in my E30 320is.
As you have discovered, quoted specifications for any given injector vary wildly depending on which website you look at - Hence the reason for my chipping in.
In the course of my research, I stumbled across THIS website, and THIS excellent spreadsheet, which is an absolute mine of Bosch Injector Data.
The flow data on this spreadsheet can be checked against those on the Bosch Automotive online catalogue, and all the ones I did check matched perfectly. Flows are in grams per minute (g/min), and the spreadsheet includes all relevant data including design operating pressures, flow @ operating pressure, flow @ 3bar (datum), latency times, spray cone angles, bifurcation, connector type etc etc.. and is very comprehensive. The part numbers covered are 150 , 155 & 156 series, but nothing later.
Also, a big "Thank you" to US Rally team for taking the time to compile such a huge amount of data.
10-07-2014, 02:15 PM
George Layton March 2014
