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DeepSpace
Grignapoco
Grignapoco
DeepSpace

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Join date : 2018-01-14
Age : 37

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PostSubject: Rev limiter   Rev limiter Icon_minitime1Sat Jun 29, 2019 3:57 am

Hey Gents,

Question 1, my rev limiter is at 8000, but from another GRiSO rider, its only 7500 orso. Any idea where he can change this?
Question 2, where does the rev limiter kick in at 6th gear?


Cheers!
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eeyore
Grignapoco
Grignapoco
eeyore

Posts : 118
Join date : 2016-09-10

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PostSubject: Re: Rev limiter   Rev limiter Icon_minitime1Sat Jun 29, 2019 4:16 am

The rev limiter is set by the ecu 8000rpm (I think!).
The user settings allow you to change rpm that makes the yellow triangle flash - sort of shift up light but this doesn’t change the actual rev limiter.
The rev limiter kicks in at the same engine speed regardless of gear.


Last edited by eeyore on Sat Jun 29, 2019 4:39 am; edited 1 time in total
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DeepSpace
Grignapoco
Grignapoco
DeepSpace

Posts : 137
Join date : 2018-01-14
Age : 37

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PostSubject: Re: Rev limiter   Rev limiter Icon_minitime1Sat Jun 29, 2019 4:37 am

His is really at 7500. I know about the gear indicator. played with that already Smile
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kiwi dave
Tiradritto
Tiradritto
kiwi dave

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PostSubject: Re: Rev limiter   Rev limiter Icon_minitime1Sat Jun 29, 2019 6:40 am

I've never tweaked it, but I believe you can change it with IAW5 writer (part of the Guzzidiag suite of tools).
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Pete Roper
GRiSO Capo
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Pete Roper

Posts : 6517
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PostSubject: Re: Rev limiter   Rev limiter Icon_minitime1Sat Jun 29, 2019 7:47 am

Nah. It can be changed but not with Guzzidiag. You need to pull the map with 'Reader' and open it in tunerpro. You can then change the rev limit point, save the map and re-load it.

Guzzidiag is simply a diagnostic and tuning program and Reader and Writer do exactly what they say. To actually mess about with the map parameters you need a tool like Tunerpro and someone clever enough to use it, ie not me!

Pete
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beetle
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beetle

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PostSubject: Re: Rev limiter   Rev limiter Icon_minitime1Sat Jun 29, 2019 9:53 am


It's a hard limit set in the map. 8000 is the factory limit.

If it won't rev past 7500, then there is an issue. Mechanical or electrical.



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Pete Roper
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Pete Roper

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PostSubject: Re: Rev limiter   Rev limiter Icon_minitime1Sat Jun 29, 2019 10:10 am

Just a thought. Has the cam timing been checked?
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eeyore
Grignapoco
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eeyore

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PostSubject: Re: Rev limiter   Rev limiter Icon_minitime1Sat Jun 29, 2019 10:49 pm

Pete Roper wrote:
Just a thought. Has the cam timing been checked?

How is the engine behaving as it reaches the 7500 rpm limit?
When the 4 valve engines reach the rev limiter it’s like hitting a brick wall, the engine is at making full power and ignition is switched off. This cycles 4 or 5 times per second - it sounds awful and feels quite crude by modern standards.
If the cam timing was out it would just run out of power and the engine speed would just fail to increase.
Fuel issues would behave differently depending on engine load.

A video of the rev counter as the maximum engine speed is reached would be useful.

Edit: for some reason I made the assumption the bike was an 1200 4v.
I have little experience of the 1100 motor as it reaches max engine speed so the above may not be valid.
However the video would still help.
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beetle
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beetle

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PostSubject: Re: Rev limiter   Rev limiter Icon_minitime1Sat Jun 29, 2019 11:23 pm


Actually, what happens is the fuel is cut at 8000, then reactivated at 7900. Hence, the 'blurp blurp blurp' when you hit the rev limiter. It's bouncing between 7900 & 8000.

We also know that if the cam chain is out by one tooth, the engine will rev to a certain point then just stop. Same effect, like hitting a brick wall. Typically this is around 6500-7000 RPM.





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