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msd chip rev limit?

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Old 17-06-2010, 06:28 PM
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stu21t
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Default msd chip rev limit?

any1 know what the std msd chip rev limits at?
i have no rev counter in my car
Old 17-06-2010, 06:59 PM
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Ive not found mine and its been way of the rev counter at times

Steve
Old 17-06-2010, 07:14 PM
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mines 6400 and its fucking loud
Old 17-06-2010, 07:27 PM
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pete mcrash
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cant remember my stg 3 having a limit
Old 17-06-2010, 07:36 PM
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6400, is that all
I thought it would b more like 7200.
I was told the engine could rev to 8k when I had it built.
Might get it upped a bit when it goes back.

Would 7200 be ok? Or pointless?
Old 17-06-2010, 07:44 PM
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mone used to bounce off the rev limiter so its more than 7k
Old 17-06-2010, 07:45 PM
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mine's 7500 now
Old 17-06-2010, 08:03 PM
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7200 soft cut
7600 hard cut

in the MSD chip file I have
Old 17-06-2010, 08:21 PM
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msd mapped my old one on standard lifters and soft cut was 7800 rpm limiter 8000 rpm, she howled and flamed like a good un
Old 17-06-2010, 08:28 PM
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does seem low but i thought that was the limit on a original engine
Old 17-06-2010, 08:40 PM
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Originally Posted by Flux Capacitor.
7200 soft cut
7600 hard cut

in the MSD chip file I have


Is that my chip si? The 1 I leant you for the diagnostic/monitor programme.

That's more like what I was expecting.

Last edited by stu21t; 17-06-2010 at 08:42 PM.
Old 18-06-2010, 12:10 AM
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Originally Posted by bad boy rs
does seem low but i thought that was the limit on a original engine
you sure it is the rev limiter and not a bad missfire
Old 18-06-2010, 06:26 AM
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Originally Posted by Tony Mannock
you sure it is the rev limiter and not a bad missfire
yeah
Old 18-06-2010, 07:27 AM
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doesn't sound like it me
smooth cut rev limit random cuts each injector to limit over rev it will then at around 300 rpm higher cut the lot it isn't loud
Old 18-06-2010, 07:41 AM
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Originally Posted by Tony Mannock
doesn't sound like it me
smooth cut rev limit random cuts each injector to limit over rev it will then at around 300 rpm higher cut the lot it isn't loud
..........more like a hick uppy jerky kind of thing..........
Old 18-06-2010, 07:44 AM
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Originally Posted by pete mcrash
..........more like a hick uppy jerky kind of thing..........
this is the technical phrase for it Thanks pete I couldn't think of it lol
Old 18-06-2010, 07:54 AM
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clever me like...............
Old 18-06-2010, 08:12 AM
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Originally Posted by Tony Mannock
smooth cut rev limit random cuts each injector to limit over rev
Just a bit of geek info....

The first smooth cut isnt designed to limit the RPM thats what the secondary hard cut does.
It is designed to warn you that you need to change gear or back off by giving the effect of a sudden moderate decrease in engine power/response.

The weber ecu's are not capable of producing random numbers of any sorts as they do not include software which allows this.
(Computers cannot produce truly random numbers but thats another discussion)

Instead the fuel is cut to each injector one at a time sequentially in the reverse firing order of the engine.
The ignition spark is provided to all cylinders regardless of rev limit.
This provides a smooth power loss with no unburnt fuel so preventing backfires.
Old 18-06-2010, 11:37 AM
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strange deffo not a miss fire, was on the rollers lastweek for a setup and nothing was mentioned
Old 18-06-2010, 11:53 AM
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Originally Posted by stu21t
Is that my chip si? The 1 I leant you for the diagnostic/monitor programme.

That's more like what I was expecting.

Si?
Old 18-06-2010, 03:51 PM
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Originally Posted by bad boy rs
mines 6400 and its fucking loud
even standard is 6500 isnt it ?

if id had that on my last saph it would of had about 1500 rpm power band lol
Old 18-06-2010, 04:14 PM
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James @ M Developments.
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dont forget the standard rev counter is shockingly inacurate.

the rev limits we set are dependant on turbocharger and engine spec, they are not all the same obviuosly.
Old 18-06-2010, 04:16 PM
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Originally Posted by James @ M Developments.
dont forget the standard rev counter is shockingly inacurate.

the rev limits we set are dependant on turbocharger and engine spec, they are not all the same obviuosly.

t34.63, greys, headwork, bd14, rebuilt engine with long studs..????

roughly?
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