Hi everyone,

Picked up a mini the other day with a pretty good list of mods.

Among them -- air filter, header, exhaust, 15% pulley, cam, ecu tune, scan gauge.

After driving it, I've noticed when slowly accelerating (only slowly) there's a flat power spot around 3k RPM in any gear. The scan gauge reports 0 to 0.5 PSI of boost in that range. I asked the former owner, and he said it was a thing with all the cooper S's, that they just don't make boost in that range. Seems off, though.

Should I have the tune re-evaluated? It's an RMW tune.

Anyways, just looking for some general input. Also, woohoo I'm a mini owner!

(attaching my mod list)

 

That is absolutely not right. You should be getting around 15psi throughout the rev range. What's it reading through the rest of the rev ranges?

 

If you're slowly accelerating, you won't be at 15 psi.

As for OP's question: I have that weird spot at 3k like you mention. No tune for me. I do have a 15% pulley, JCW 380cc injectors, DDM intake, GP intercooler and a DT bypass valve.

 

Around 3000 is when the bpv closes...it is MECHANICAL, and is controled with a spring and engine vac...
It's just the way it is....the transition from unboisted to boosted is the flat spot.
The tune cannot change it...its not like on a turbo motor.

 

Someone showed me a stock Mini's dyno and it all made sense, it's exactly the flat spot I was feeling. I'm confident it's normal, and probably even more noticeable thanks to the underdrive pulley.

Now, that acceleration on the right side when accelerating... time for new CV axles.