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Thread: Increase in top speed

  1. #1
    Join Date
    Dec 2005
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    Cirencester
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    47

    help Increase in top speed

    I love my beat but i always seem to have trouble in passing the guy who drives along the motorway at exactly 70. I just start to pass and the ecu limits me at about 7,500 revs.

    I can go way above this in other gears so it strikes me that there must be a switch somewhere telling the ecu i'm in fifth. If I disable this I will get the little extra bit of go I need.

    Does anyone have any ideas/info on this?
    I love the smell of Nitrox in the morning !

    1992 Beat
    2000 Seicento Sporting
    2000 Landrover Freelander to tow them home with

  2. #2
    Join Date
    Oct 2006
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    Pye Green/72800 France
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    sure my standard ECU is 9k in 1st-4th & 8.5k in 5th which hits the limiter at 86mph/140kph
    the ECU i have in now is unlimited in any gear but not yet tried out fully in 5th, maybe at Donnington down Craner curves in July

    pretty sure there have been threads about the 7.5k limit in the past?

  3. #3
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    Oct 2006
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    Pye Green/72800 France
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    http://www.u-ukhbc.co.uk/vbb/showthr...ght=7500+limit

    not too sure about a definitive answer here but worth a read

  4. #4
    Join Date
    Mar 2011
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    107
    With a standard ecu and a speedo converter mine will rev to the limiter (9.5k ish) in top

  5. #5
    Join Date
    Mar 2011
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    107
    Just thought about this a bit more: My old Beat didn't have this limit in top either. On both I used an electronic speedo converter - on my 1st one just to remove the speed cut (wired it into the VSS feed on the ecu) on this one I'm using it to convert the speedo from kph to mph as well.

    In both cases the ecu is getting a lower than actual speed to it's VSS feed - it could be the answer???

  6. #6
    Join Date
    Jun 2005
    Location
    Cornwall
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    Hiya,
    I had a look at the speedo when I rebuilt my Beat in hope that the limiter was like the one on MR2's which have a set of contacts on the imports that open as the limit is reached with the needle, but alas not there! so in my eyes it has to be a wire from the speedo back to the ecu transmitting a cut of signal when it hits 85 mph, but which one?
    A true sports car should be designed so that when you sit in it you can put your arm over the side and touch your knuckles on the ground.

  7. #7
    Join Date
    Mar 2011
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    The ecu is fed by the same feed as the speedo and just counts the pulses to figure out the speed, so fitting a converter just cons the ecu into thinking the car is going slower than it actually is.

    The feed runs from the speed sensor up to the speedo (thick yellow/red wire) then back to the ecu (thin yellow/red wire)

  8. #8
    Join Date
    Jun 2005
    Location
    Cornwall
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    Quote Originally Posted by fxdlidon View Post
    The ecu is fed by the same feed as the speedo and just counts the pulses to figure out the speed, so fitting a converter just cons the ecu into thinking the car is going slower than it actually is.

    The feed runs from the speed sensor up to the speedo (thick yellow/red wire) then back to the ecu (thin yellow/red wire)
    So by that thought, snipping the thin yellow/red wire should take the limiter off? Unless it interupts an earth track (usual with ecu's) to limit it, in which case earthing (grounding) it would be the answer!
    I can't see it being that easy, there again it was that easy to take it off mr2's!
    A true sports car should be designed so that when you sit in it you can put your arm over the side and touch your knuckles on the ground.

  9. #9
    Join Date
    Mar 2011
    Posts
    107
    If you just cut the wire the check engine light comes on and the car doesn't run properly - it needs some sort of feed.

    One of these willl do the trick http://cgi.ebay.co.uk/SPEEDO-CONVERT...item5d2579f57c , you can pick up the power and earth for it from the feeds to the ecu.

  10. #10
    Join Date
    Feb 2007
    Location
    Rochester, Kent
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    586
    ..........And your next thread will be.........


    ...............Blown my engine, can someone help!...........

    <<<<<<<VERSION Z>>>>>>
    >>>gone, but not forgotten<<<

  11. #11
    Join Date
    Jun 2005
    Location
    Cornwall
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    Quote Originally Posted by fxdlidon View Post
    If you just cut the wire the check engine light comes on and the car doesn't run properly - it needs some sort of feed.

    One of these willl do the trick http://cgi.ebay.co.uk/SPEEDO-CONVERT...item5d2579f57c , you can pick up the power and earth for it from the feeds to the ecu.
    just thinking really, Not for me though, the wipers on mine lift at 75 mph and due to it's size and wieght I think the 85 mph limiter is a good idea, just thinking on theories to increase the top end speed for folk, not like someone here who seems to think it is also going to increase the top end rpm and blow the engine!
    A true sports car should be designed so that when you sit in it you can put your arm over the side and touch your knuckles on the ground.

  12. #12
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    Feb 2007
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    Rochester, Kent
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    586
    Oby,

    Please explain how you intend to go faster then and not increase engine rpm?

    <<<<<<<VERSION Z>>>>>>
    >>>gone, but not forgotten<<<

  13. #13
    Join Date
    Aug 2002
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    Kent
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    The 7000rpm problem was in all gears, not just 5th.
    and No we never found a solution to it.

    Im not sure where the effected cars are now, if they still have the problem.

    As for speed limiter, it kicks in at 140kph. which I think you can probably only reach in 5th gear anyway. (4th you will hit the normal rev limit (9000rpm))

    Using a speedo convertor and wiring it in before the speedo/ecu will most likely lift the limit (poss to 140mph, if you could get there) so you will then hit normal rev limit (9000rpm) in 5th if the conditions are right.

    Mind you, any thing past 140kph things do start to get a bit lively with the Beat not weight a lot.
    Steve M
    __________________

    Its all gone Norfolk!!!
    Now in the Lotus position.

  14. #14
    Join Date
    Sep 2007
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    216
    A little off track, but..

    For a few years after the engine swap, etc., I am consantly asked 'what is the top speed?'. I was never concerned until last Easter during a lazy drive down the coast. During the rapid acceleration from 70, sped past a struggling Mustang and Charger. Finally, for the record, top of 142mph (@10.9k) with passenger. Surprizingly stable probably due to the 15" tires and canards. I quickly slowed but not fast enough as soon there were lights in the mirror. After discussion of the holiday and the earthquake 30 minutes earlier, I got a ticket for 70 in a 65.

  15. #15
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    Apr 2010
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    Japan
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    As they say, there's no substitute for cubic centimeters. But I'm trying to picture any stretch of the coast hwy where you could go that fast. Wow.


    Past Hondas:
    1960 125cc Honda Benly CB92R
    1964 305cc Super Hawk CB77, the only vehicle I have ever bought new in my life!
    Honda CB160, roadraced as 175cc 1967-1970.
    Honda Lawnmower, bought used in 2003, caught fire and melted in 2005.

  16. #16
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    Jun 2005
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    Cornwall
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    Quote Originally Posted by Mylee View Post
    Oby,

    Please explain how you intend to go faster then and not increase engine rpm?
    Oh dear, the engine seems to be limited to 9500, top revs in top gear are 7400, increasing the top speed will increase the revs but no more than what is available in the previous 4 gears hence we are not talking about increasing the revs!
    A true sports car should be designed so that when you sit in it you can put your arm over the side and touch your knuckles on the ground.

  17. #17
    Join Date
    Aug 2002
    Location
    Kent
    Posts
    1,499
    I'm certain someone can probably work out what the road speed would be, IF you could get it to rev to 9500rpm in 5th.

    But I expect it may struggle to get there, or would need a hell of a long straight. If not a down hill stretch.

    I remember round castle combe circuit, it was only on the start finish straight I would hit the 140 kmh limiter.

    Any way each to their own as they say and I'm not sure if this was really the original posters idea/problem.
    Last edited by Steve_M; 11-06-2011 at 01:39 PM.
    Steve M
    __________________

    Its all gone Norfolk!!!
    Now in the Lotus position.

  18. #18
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    Nov 2008
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    Canadian prairie
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    brucebp, how about a supercharger for your beat? 110hp. you could accelerate to 140km/hr (speed limiter) instantly to pass!

    http://speedhunters.com/archive/2011...onda-beat.aspx

  19. #19
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    Apr 2010
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    Quote Originally Posted by bigB View Post
    brucebp, how about a supercharger for your beat? 110hp. you could accelerate to 140km/hr (speed limiter) instantly to pass!

    http://speedhunters.com/archive/2011...onda-beat.aspx
    SWEET! I bet quite a few owners would buy those if made commercially available.


    Past Hondas:
    1960 125cc Honda Benly CB92R
    1964 305cc Super Hawk CB77, the only vehicle I have ever bought new in my life!
    Honda CB160, roadraced as 175cc 1967-1970.
    Honda Lawnmower, bought used in 2003, caught fire and melted in 2005.

  20. #20
    Join Date
    Mar 2009
    Location
    Shropshire
    Posts
    431
    Doing a turbo conversion would actually be that hard on these it was always something Jen looked into before she went with the other option

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