There;s clearly a vacuum leak somewhere or the MAF has a problem. the boost is around 18.5PSI across the board and the MAF is measuring air for like 10-12. The overboosting code may have the origins in that, because the ECU is trying to achieve the commanded load which is directly proportional with ...

Memolax05 wrote: ↑October 6th, 2026, 1:25 pm I found out that I have a possible air leak or unmeasured air

Your logs don't show any.
But as I said your MAF cal may need some work.

The knock retard is measured in crank degrees, not percent. The maximum is 6 from 3500 and up (there's a table under the Ignition section that sets that). The MAF calibration you're running seems to be for a stock intake, so that needs a bit of work because the CS Stage2 intake flows similarly or a ...

Add a datalog to this thread.

Having the VE table spot on may help in calculating better the fuel trims, but on ECUs with MAF all you have to do is to get the MAF calibration right. Let's take an extreme example of a head or cam combination that will lower your VE from 0.9 to 0.8 in a certain rpm/load area. That's a 12% variatio...

You can use a base crackle&pops tune from the library. It's even better if you have upgraded HPFP internals, but no problem without.

It's not glass and I'm not concerned about them breaking after demanding too much power from them. And they can make a lot of power well past the point on a MX5 you will need a lot of other mods to make it work. I am talking strictly from a longevity/reliability perspective. Which is also the reason...

Mazdaspeed people use the stock 2.5L bottom end with the stock 2.3L DISI head on it as a cheaper solution to replacing a blown up motor. Gap the rings for boost and most people have no issues running 1 bar or a little higher boost. Yes, people do that, but those engines do not last. If you want to ...

Hello, Mituk. I can't believe how hard must be to copy&paste someone's name when replying :) You mentioned that the engine "might not last long" as it is—could you elaborate on exactly what you meant by that, even with 0.5 bar of boost? Perhaps I should lower the boost pressure? As fo...

Leave it at 0.5-0.6bar. The very long stroke and large bore of the 2.5 engine are a liability in the stock form of this engine, The engine itself would take a lot more boost in its stock form (1.1-1.2bar as long as you do not run out of injector) but it may not last. Actually it may not last very lo...