944Hybrids: 924/944/968 and 928 V8 Conversions
Would you like to react to this message? Create an account in a few clicks or log in to continue.

Mon Jul 08, 2013 3:56 pm by Admin

For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

Comments: 0

Similar topics
    Latest topics
    » Ray's 1987 944 LS1 Build & Swap
    Tach reads low EmptyWed Oct 20, 2021 1:39 am by Raymond-P

    » Brand new ls3 build
    Tach reads low EmptyTue Oct 19, 2021 1:36 pm by Plucky948

    » Cereal bowl plate
    Tach reads low EmptyMon Oct 18, 2021 8:18 pm by Raymond-P

    » bellhousing pressure plate interference
    Tach reads low EmptyMon Oct 18, 2021 4:24 pm by Hotrodz of Dallas

    » Confused about brakes
    Tach reads low EmptyMon Oct 18, 2021 2:55 pm by Porsche951toLS3

    » Rally LS-Swap First Fire!
    Tach reads low EmptySat Oct 16, 2021 5:01 am by MotoRider42HC

    » Clutch master cylinder misalignment
    Tach reads low EmptyThu Oct 14, 2021 8:46 pm by Porsche951toLS3

    » Honda k24 swap
    Tach reads low EmptyThu Oct 14, 2021 6:38 pm by Vlad

    » 948 swaps in New Jersey
    Tach reads low EmptyWed Oct 06, 2021 11:57 am by tannerhwilson

    » single cooling fan to twins
    Tach reads low EmptyWed Oct 06, 2021 6:02 am by Leva

    October 2021

    Calendar Calendar

    Log in

    I forgot my password

    Tach reads low

    2 posters

    Go down

    Tach reads low Empty Tach reads low

    Post  JohnG Wed Jul 06, 2016 5:24 pm

    I have an LS1 with a MEFI4a ECU in a 1987 944S(951) that I recently purchased. The conversion was done about nine years ago.

    I have been told that the tachometer output from the MEFI4a ECU is the same as for a "standard" GM ECU on an LS1; 5 volt square wave with frequency dependent on engine speed. I believe that the ECU tachometer output is connected directly to the original Porsche tach. From research on this forum, it seems that this should work correctly. However, when the rev limiter of the ECU kicks in at a nominal 6000 RPM, the tach is only reading about 4600.

    Has anyone else has run into a similar problem?


    Posts : 7
    Join date : 2016-06-20

    Back to top Go down

    Tach reads low Empty Re: Tach reads low

    Post  Arthropraxis Wed Jul 06, 2016 8:49 pm

    My tach does not read low. It is not connected to the back of the tach. Have you checked this connection? Mine is connected to the tach wire that connected to the original DME. I forget the color of the wire.

    Posts : 1103
    Join date : 2009-09-02

    Back to top Go down

    Back to top

    - Similar topics

    Permissions in this forum:
    You cannot reply to topics in this forum