Felpro System (was Street/Race EFI Article) (fwd)

Jesse R. Ortiz jr at ij.net
Wed Mar 25 23:13:50 GMT 1998


Just more question on this, Does anyone have a website where you can get
more info, pricing on this system?

Thanks


>DIY Group: The message below is from Jay Carter, a much respected
>Buick GN tuner, who does GM ecm chips and much fuel inj experience.
>It outlines very well the new FelPro fuel injection and may be of
>interest to this group:
>Regards,
>
>frank parker
>
>
>From: Jay Carter <jcarter at gte.net>
>To: gnttype at gnttype.org
>Subject: Felpro System (was Street/Race EFI Article)
>
>I have setup and programmed several of these units on different vehicles
>and I have to say that this is the slickest unit I have ever seen. Not only
>is it relatively simple to calibrate compared to other units, it's also
>very user friendly, very fast and has some really trick features. One such
>feature that is the slickest thing I have ever seen is the ability to
>record a run and the come back and overlay it on top of your base fuel
>table and play it back in slow motion. This lets you analyze what happens
>every step of the run and make changes if necessary.  It even has a
>simulated engine sound that climbs in tone as the RPMs go up! The closed
>loop setup also makes calibration a snap. Just plug in the A/F ratios you
>want to use and the ECM will correct itself back to the commanded A/F
>ratios as long as your within the (user defined) correction limits. This
>way, you can play the run back, change the base fuel map as needed and
>eventualy remove the O2 and have a system that's 100% dialed in. The timing
>table is also much more detailed than the DFI and allows much more precise
>control of the timing. It also has an adjustment that allows you to set the
>timing precisely and remove all the guesswork from what your timing REALLY
>is (Unlike the DFI).
>
>While on the surface, this unit may seem like a jazzed up DFI. Well, its
>not. There is SO much more going on here than meets the eye. This system
>uses an entirely different approach to delivering fuel to an engine than a
>DFI. Instead of setting up your fuel table according to base pulse width,
>the Felpro system works on a volumetric effiecient approach. There are
>many, many factors used to calculate fuel delivery instead of just plugging
>in a base pulse width and going like the DFI does.  Engine size, injector
>size, etc all play an important role in the fuel delivery algorithm on the
>Felpro system. Let's say for example your car is running 55lb injectors and
>the calibration is perfect but you wanna switch to something different.
>So.. you go out and buy a set of 83s and install them in the car and change
>your injector constant to 83lb/hr. Now.. while this won't get you DEAD on
>the money, it will get you very, very close so that only small adjustments
>will need to be made. Pretty slick, huh? This is a TRUE speed density
>system.. not a lookup table system like the DFI has. Also, because the
>system is true speed density and uses the VE table, the smallest increment
>of change is 8 uS (microseconds), while the DFI is 64 uS. This is very
>important for cars running big injectors.
>
>
>Another great feature of the system is the aforementioned data logging
>system. It allows recording of a "dashboard" during a run. There are 15
>"dashboards" that are preset but can be altered by the user. You can pick
>and chose between which ones you want to record and also how many frames
>per second you'll be recording. You can also set the sensor that triggers
>the recording process to start (Most every sensor on the car can be used as
>well as RPM, etc) and you can set where the threshold is. Also, all data
>recording is handled INSIDE the Felpro's PC software (Calcom). You dont
>have to exit the program and load the data file into a text editor to read
>it and analyze it. You also get nice graphs that can be stepped through a
>frame at a time as opposed to a big column on numbers. However, the data
>can be exported in a text file if you so desire.  The number of frames per
>second can be adjusted from 1 to 50 frames per second but is somewhat
>dependent on the speed of the PC you're running Calcom on. 50 frames on a
>fast 486 is not a problem, tho. The limiting factor is the number of
>recordable frames per second which is right now at 150. However, with a 10
>second car, that's still about 13 frames per second.
>
>Another great feature of the software is the editing ability to cut and
>paste, manipulate blocks of data and interprolate.  You can cut blocks of
>data  from an offline calibration and paste in into your existing cal file,
>change values in blocks of data without having to change EVERY valve (like
>DFI made you do) and you can even interprolate data by highlighting four
>corners of your map and telling the software to interprolate between the 4.
>Very slick.. similar to working with a spreadsheet. Constructing a base
>calibration is a snap. You can set every valve in the VE table to 60-70 and
>the car will most likely start and run because the wideband O2 will bail
>you out of trouble.
>
>
>Sorry to be long winded but hopefully this will help answer some of the
>questions that people have concerning this system.
>
>Jay
>
>Jay Carter
>10.92 @ 123 through the muffler
>
>Mail To : JCarter at GTE..NET
>
>
>




More information about the Diy_efi mailing list