When optimising the tune on a high revving engine, nothing beats a bit of intensive track time where true data can be captured safely in the engine's upper rev range. Those of you following this post will already know Monty's recent session at Castle Combe was not without incident, but as far as I'm concerned that was to be expected, and also as planned I was finally able to safely record accurate logs above 7,000rpm where sufficient samples were taken to allow for accurate fuel dosing changes to the upper reaches of Monty's VE table.

Rather than extrapolating and estimating the VE numbers in the six key cells right at very the top right hand corner of the VE table, I was finally able to use the gathered data and the excellent EMU Black AutoTune feature to properly dial in Monty's full load fuelling from 7,000rpm to 8,400rpm, and do so in a safe controlled environment!

I've subsequently also fed the additional data I gathered at Castle Combe into AI, and it's given me the following revised dyno graph, interestingly the latest graph is only 2hp down on my earlier 'before Castle Combe' prediction of 215hp, as we can see peak horsepower is now predicted to be 213hp at 8,250rpm and peak torque arrives at 6,100rpm where Monty is giving 168 lb/ft.

[Linked Image]

Monty hits the dyno at Surrey Rolling Road next Saturday, this will provide the ultimate 'real world' evidence to show how accurate this final AI estimated graph really is? Actually it'll be interesting to lay this final AI graph over the 'real world' graph Monty produces next week. As always with rolling roads there are huge variations in the numbers they give you, but at least I'm going back to the same dyno where Monty recorded 172.7hp two years ago.

After that session I did advance Monty's ignition timing by 2.5 degrees at the top end, so I'm confident he actually made 180hp in Stage 2 tune, and before the latest changes. So it's now all about how much the A.L Developments big valve ported head and Phase 3 cams have actually added, constitutively I'd say the head is worth 15hp and the cams are worth another 10hp, so if we take 180hp and add the total additional 25hp we actually get 205hp.

TBH if Monty really does make 213hp I'll be absolutely delighted, but as far as I'm concerned anything over 200hp would represent a good result in my book, just one week to go and all will be revealed chaps thumbs

Last edited by Montegue; 13/06/26 01:35 PM.