Safety Rev Limit

nanook · Post by **nanook** » Sat May 09, 2009 12:10 pm

What is Safety Rev Limit and when does this kick in

TSL · Post by **TSL** » Sun May 10, 2009 10:35 pm

For HCR32 ecu?

nanook · Post by **nanook** » Tue May 12, 2009 9:05 am

Yea HCR32 safety rev limit

its a mystery

TSL · Post by **TSL** » Tue May 12, 2009 10:16 am

No mystery.
Engine under heavy load for a certain time with 0kph speed will do a fuel cut.

Speed = 0kph
TP > 64
some sort of time factor is involved
and something else I can't remember right now.

Shouldn't have any effect on most cars. It can be a problem with engine conversions when the speed signal isn't connected to the ecu.

There will always be new parameters discovered and added to nistune from time to time. Best thing if you are not sure what something does is to leave the standard value.

Pedro · Post by **Pedro** » Tue May 12, 2009 10:26 am

sounds like a zero Kph rev limiter

any way of getting this on all the cars ??

or is it just the r32

TSL · Post by **TSL** » Tue May 12, 2009 11:11 am

Pedro wrote:sounds like a zero Kph rev limiter

No, not really.
It is a safety limit that comes in under a specific set of conditions as described above. 0kph speed is only one of those conditions, high TP is another.

Pedro wrote:any way of getting this on all the cars ??

or is it just the r32

Each ecu is different.
Why would you want this anyway?

Pedro · Post by **Pedro** » Tue May 12, 2009 12:19 pm

maybe with the right settings this could be used as a launch control sort of thing

I saw in another thread ppl were asking about launch control and maybe this is a way of doing it

but being fuel cut it may be harmful

nanook · Post by **nanook** » Wed May 13, 2009 9:43 am

Thank you TSL

Yes it sounds like if you could access and control the variables inc tp then this could be used as a launch control or idle rev limiter.

Some clever spark will crack this.....

TSL · Post by **TSL** » Thu May 14, 2009 11:36 am

No because the TP and RPM check are hard coded, and the fuel cut method used is completely inappropriate for launch control, etc...

Ideally you want an ignition cut limiter activated by a clutch pedal switch.