Reply to Thread

Post a reply to the thread: EAT- Mark D'Sylva

Your Message

Click here to log in

Please correctly re-type the phrase f o o t d o c t o r in the form box. Re-type it without the extra spaces and put the one space where it should be. We apologize for having to do this but this silliness helps slow the spammers.


Additional Options

Topic Review (Newest First)

  • 02-22-2008, 08:19 PM

    Re: EAT- Mark D'Sylva


    Do you happen to remember the part number of your EAT chip ? I still have not installed mine yet and I also live in CA with the 91 octane gas available. I just want to make sure my EAT ship is the same one you installed in your 1991 M5.

  • 02-05-2008, 12:07 PM

    Re: EAT- Mark D'Sylva

    Email Mark at Mark D'Sylva

    [email protected]
    mark (at)

    I have had his EAT chip in my 91 M5 for about a year and couldn't be happier. I've only put a few thousand miles on it, but I haven't heard it ping or knock once. I live in CA and was clear with Mark that I needed a 91 octane chip.

    Power improvement is noticeable, and the jump in power at 4k rpm is gone because it has more power between 3k and 4k. I've heard estimates of 35 hp gain. Apparently it's much easier to extract extra power from an OBD-I car.

    Join the yahoo E34M5 group. Mark has an E34M5 and is a member of the group, although I don't think he keeps in touch as much as some of us.

    Eric Lee
    91 M5
    Monterey, CA
  • 01-30-2008, 03:06 PM

    Re: true that, but...


    Were you able to get in-touch with Mark D'Sylva at EAT? Is there another version for CA cars? I have only very minor pining with the old 1995 Dinan chip and with the regular CA 91 octane gasoline and without any octane booster and my car has 90K miles. The EAT chip is supposed to work even better than the Dinan chip so I don't understand why you are having problem with your engine running with it.

  • 01-30-2008, 06:11 AM
    Mike 1991 M5

    true that, but...

    ...the engine has only 45,000 miles on it and was given a full inspection II at 41k. when the chip was in, i tried some octane boost, which is mostly toulene, and it didn't seem to help. pulled the chip and went back to stock and it runs smooth.

    i will be bringing the car into my mechanic pretty soon to have him look at it and tune what he can. will pop the chip back in after that to see if there's a difference.
  • 01-29-2008, 06:12 PM


    FWIW - The ping can have a lot to do with your engine's state of tune - especially the cleanliness of your combustion chambers (where excess carbon can lead to hot spots or increased compression). An engine that was already running a little lean won't like being pushed either. High RPM knock is an excellent way to destroy pistons so it's not something you want to fool with.

    BTW - 12Oz of toluene (about $5 a gallon) or a gallon of race gas when you fill up can up the octane to more reasonable levels (~94) although I'm pretty sure Mark's chips are designed to run with standard 91 octane presuming no other issues with the car.
  • 01-22-2008, 01:46 PM

    Re: I had to take mine out.


    Please let us know as I also live in California and I have not had a chance to install the EAT chip I bought a few weeks ago from them. From the earlier 2003 threads here, I read that the D'Sylva EAT chip was supposed to have no knock/ping when compared to the Dinan chip (which I currently have in my 91 M5 now). I do get slight knock/pin when throttle around 3000rpm with a 1996 Dinan chip and with the CA 91 Octane gas and no knock/pin above 3000rpm (that I can discern).


  • 01-21-2008, 06:21 PM
    Mike 1991 M5

    I had to take mine out.

    As nice as it made driving the car when you're not giving it much throttle, it made it knock/ping quite a bit when giving it throttle below 5,000rpm. I think this is just due to crappy gas in California. Still need to talk to Mark about it, as I read on the yahoo mailing list that he had a California version of the chip that was a little less aggressive with the timing advance -- but as I mentioned in another thread, I get no replies to emails... Will have to call him soon.
  • 01-17-2008, 11:04 PM


    Just curious what you guys think of the EAT tuning... Thinking of getting one myself.
  • 01-08-2008, 03:16 PM

    Re: I used this guide

    Thanks. I also have a copy of the same thing. I just thought EAT might have their own specific instructions but I guess not. Thanks again for the help.
  • 01-07-2008, 10:11 PM
    Mike 1991 M5

    I used this guide

  • 01-07-2008, 05:21 PM

    Re: Not sure? I didn't do it for power gain.

    I ordered the EAT chip and it finally arrived. Mine didn't come with any installation instructions. Did yours ? I am sure I can track down the instructions from several E34 M5 sites.

  • 12-20-2007, 04:44 PM

    Re: Not sure? I didn't do it for power gain.

    That's good to hear. I am the original owner of my 91 and now has 93K miles on the baby. I installed a Dinan chip about 5 years ago but I keep hearing the EAT/D'Sylva chip is better at the low end so I thought I would give it a try. Thanks for the information and I will go ahead and get one on-line from EAT.
  • 12-19-2007, 09:33 PM
    Mike 1991 M5

    Not sure? I didn't do it for power gain.

    I think it's like +15bhp at the top end but I don't really care; I rarely push the car to it's limit. I'm not sure if I could even feel the difference between 310bhp and 325bhp!

    I installed the chip to smooth out the torque curve and give me better part-throttle response, and it did just that. Driving the car around town is much more tolerable now. It feels silky smooth. The idle used to be pretty rough/noisy (wup-wup-wup-wup sound) but it's smoothed out now, as well.

    I figured I was going to do it sooner or later, so I may as well do it sooner (just bought the car a couple weeks ago). I think Mark could step up the professionalism a little bit... A confirmation email would have been nice. I would also expect that when I shell out $230 for a chip, it'd come in a static bag... But hey, it works great and that's what matters, right?
  • 12-19-2007, 12:47 PM

    Re: chip came today. yes, ordered directly.

    Thanks for letting us know. What is the claimed HP and torque gain for the latest version of the EAT/D'sylva chip for our beloved E34 M5 ?
  • 12-18-2007, 03:55 AM
    Mike 1991 M5

    chip came today. yes, ordered directly.

    I didn't get any sort of confirmation communication, but it showed up today in the mail. Going to install it first thing tomorrow morning.
  • 12-14-2007, 10:09 PM

    Re: [Oops!], i hope so! i just sent him money 2 d

    Did you just order from EAT web site directly ? Please let us know if you do receive the item, then I'll know they are still in business.

  • 12-14-2007, 03:32 AM
    Mike 1991 M5

    [Oops!], i hope so! i just sent him money 2 days ago

    no reply yet... ungh.
  • 12-14-2007, 03:04 AM

    EAT- Mark D'Sylva

    Is EAT still in business? I searched this forum and found most of the discussions on the Mark D'Sylva chip were back in 2003.

    I tried calling the phone number listed on the web site but didn't get a return call. I am trying to buy a chip for my 1991 E34 M5.

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
1e2 Forum