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 Post subject: rev limiter cutting in at 4900rpm?
PostPosted: Sun Jul 02, 2017 11:48 pm 
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Joined: Sun Jul 02, 2017 11:42 pm
Posts: 8
Location: U.K.
Hi
I have a mini fitted with a swift gti. Bought it as a project and got it on the road. I'm not running the swift clocks and never wired up a rev counter. I took it to rolling road last weekend and it's hitting the rev limiter at 4900rpm and just pops and bangs .
I've wired in the flash code bit and getting fault 24. Think this is speed sensor in the original clocks.
Would this be a possibility to the cause of the issue in having. I think it's mk3 loom with f5 on ecu

Regards Tom


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 Post subject: Re: rev limiter cutting in at 4900rpm?
PostPosted: Mon Jul 03, 2017 1:50 pm 
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Joined: Thu Oct 01, 2009 4:42 pm
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Location: BRISBANE
4900rpm is pretty high for a limp mode (fault)rev limit.

Do you have aftermarket cams?
I'd look into the valve springs. It sounds more like valve float at that rpm.

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 Post subject: Re: rev limiter cutting in at 4900rpm?
PostPosted: Mon Jul 03, 2017 5:19 pm 
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Joined: Sun Jul 02, 2017 11:42 pm
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Location: U.K.
As far as I'm aware it's there standard. Part of me thinks it's ecu problem or could be fuel. Here's my dyno print out . Chap reckons my ecu was cutting out?


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 Post subject: Re: rev limiter cutting in at 4900rpm?
PostPosted: Mon Jul 03, 2017 9:06 pm 
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Joined: Sat Feb 05, 2005 6:51 pm
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Location: Chch - Quake Capital
Hey Tom, I had a very similar problem, changed ecu, dizzy, coils etc and it turned out to be a couple of collapsed hydraulic lifters.

Grab a new set off ebay and replace them all.


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 Post subject: Re: rev limiter cutting in at 4900rpm?
PostPosted: Tue Jul 04, 2017 8:05 am 
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Joined: Mon Aug 25, 2003 12:00 am
Posts: 3493
Location: Brisbane
Depends where the engine/ecu came from but the japanese spec cars have a speed limiter at 180 klm hr, if yours is one of these cars and the speed sensor is showing a fault then perhaps the speed limiter is kicking in, an easy test would be to disconect the speedo cable and go for a drive and see if it still has the issue.
just reread your post and you say your not running the std suzuki clocks so as far as i am aware the ecu gets its speed signal from the speedo head, so if your not running a std speedo head then i dont know how the ecu would determine what speed you are doing, the cut on your dyno charts is in exactly the same place each time and does not appear to be load related .

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 Post subject: Re: rev limiter cutting in at 4900rpm?
PostPosted: Tue Jul 04, 2017 8:38 am 
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Joined: Sun Jul 02, 2017 11:42 pm
Posts: 8
Location: U.K.
I'm totally lost with it that I could do with trying another ecu or go to megasquirt ecu


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