Trying to meet my quota of thread starts in '05...

There has been some off and on again discussion about raising our rev limiter, and how we can do it. Initially it seemed to be only via MTH, but that maybe is not so (MTH thread titled "8500 RPM's???"). M7 is at 8150 I believe though... which is cool.

And for those of us with the UNChip, there has been some talk about our options...

As I shared in a thread recently, from UNIChip's FAQ page, this can be found:

Does the Unichip only control timing and fuel?
No, the Unichip can also control:

Variable cam timing switch-over points
Electronic boost control
Water injection
Override speed limiter
Drive additional injectors
Raise your rev limiter
Control progressive nitrous control with retarded timing
Provide launch control on turbo-charged applications
Remove the alternator load under prescribed conditions
Replace mechanical ignition system with mapped ignition
Optimize timing and fuel map settings

http://www.unichip.us/faq.asp

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Well, I decided to contact them, namely their GM Jack Friedman. I have several emails from him over the past couple of years, and he has always been very prompt with his responses, and thoughtful in his replies. Today was no different as I heard back from him within a couple of hours. And this is what he had to say:

Tony,

Thanks for the inquiry. Raising the rev limiter requires an additional board to change the ECU’s clock speed and can be done, although we never explored that option on the MINI because it involves a “detectable” modification to the vehicle which is not our PnP objective. It’s a similar footprint to reflashing the ECU which can be detected even after the ECU has been flashed back to stock. It also won’t provide as much of a performance gain as most guys think (the difference between torque and bhp or force and work) unless it’s extended by a significant amount and the head/cam are modified to allow the engine to breath quicker at the higher rpms.

None the less, if it’s something the community really wants, we can take a look at it in our PnP kits. Assuming (since we haven’t looked at it in any depth to date) the circuitry is accessible on the ECU board (could be buried a couple of layers down in a multiple layer board) the option may already exist for people with the kits on their cars by going to a Unichip Custom Tuner who can do the custom installation/tune for them

Cheers,

Jack

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So, if there is sufficent interest (Jack will be made privy to this thread) in this option, it seems like it can indeed come to fruition...

 

When Josh was in Atlanta and did my tune, we talked about raising the rev limit but did not pursue it. Since then, I have decided it was a good idea...... I have een meaning to contact him and your thread has given me a "bump." If you have not done a custom tune,.... it really helped my car......runs smoother and feels more linear.

 

I too would like mine raised to at least 7,500 but kept beloe 8,000 RPM

I think it is IRRESPONSIBLE to just go up to 8,150 or above. .. Particularly if you don't have at least, a head plus CAM upgrades

"NEVER BE THE FIRST TO PRESCRIBE A TREATMENT, NEVER BE THE LAST"

 

I have head and cam and i was thinking 7500-7750

 

Likewise, Let's get it done ... If you do get a custom tune done, send the file to UNI-chip and have them send it to Detroit-Tuned, for me and MSFIT Toy

 

I did have a custom tune done about 3 months ago...... Josh Murray has the file.......my car runs strong and more importantly the A/F runs from 11.36 to 12 so while a bit rich for max power, very safe.

 

I actually was set for my first custom tune this past Thu, but I called them a few days prior to cancel, and rescheduled for a later date. With M7 400cc injectors recently installed, I thought I was finally ready to refine things... It now appears that I'll have some other goodies to try-out relatively soon, and it might be best to wait for this custom tune a little bit longer, so I am...

I'm not totally certain at this juncture if I want a raised RPM rev limit, but I certainly know that I would like the option to, esp when that time comes (head/cam)...

Bob, I haven't yet shared this thread with Jack, but it sounds like you might be contacting Josh soon though. If so, please share this thread with him. I don't know how much interest they need to merit this direction, but at least we have a couple already...

 

Happy Holidays Guys! (Was that politically correct?)

I would also have a HIGH interest in this.