Final results [227 bhp / 196 FtLb]

Back on the rollers the other day to check the mapping and ensure everything is ok now the first 1000 miles have been put on the engine.
Consistent results with last time and running fine with no signs of knock. I still however don’t have full confidence with the car yet, and I don’t think I will until the big cams and ITBs are on, so it’s time to speed the next step up 🙂

Can see the vacuum increase on the dyno plot below, so a bigger TB would probably give a little more power. However I think I’ll just jump straight to the ITB’s than mess around anymore on the stock inlet. It’ll be much better overall to take a nice clean cold air supply right from the front. Of course no concerns with cam profile when on ITB’s too 😉
Pretty sure I’ve decided on the ITB set, little peak of them below too!

Dyno Dyno Dyno Dyno

Mapped again [224bhp / 195FtLb]

More than impressive result on the rollers last week for the new engine! Mapping was by Ray West based near Thruxton:

Still needs bigger cams with VVT delete, ITB’s and an upgraded fuel system. Pretty sure I’ll go for 300deg Catcams and fuel system first (external surge and pump setup), followed by ITB’s after. Would be better from a mapping point of view to do it all in 1 hit, but it’s a lot of cost(!) and the cams need to be swapped asap really to reduce the dynamic CR of the engine (usual problem of small cams and high static CR as it stands now). I could just swap the cams but I don’t think the current fuel system would cope with 230+bhp.

IMAG0732 IMAG0733

Dyno Fun: Stock [193bhp/154FtLb] Vs. Now [212bhp/182FtLb]

Decided today to go back to Surrey Rolling Road for a power run to obtain a more accurate comparison using the same rollers where my first ever run on this car was performed. Back then it had just a Supersprint Race cat-back exhaust and a K&N panel filter, where it made 193bhp and 154FtLb. Today it made 212bhp and 182FtLb, with more power everywhere! Unquestionably last years tuning has been a difficult and much more expensive journey than ever planned, but a resounding success regardless.

I also of course now have a new baseline figure for which to compare against the next set of changes that’ll come this year; headwork, wilder cams and ITB’s. The order of which hasn’t been fully decided and a reaffirmed objective is of course not to trash the mega midrange the car now has. This means the cam choice will probably more mild than I was originally thinking… but what’s the point in chasing an overall peak figure if I ruin a hugely drivable engine as it is now 🙂

Before and After Before and After Rolling Road

Is it finished? [215bhp /]

I have not documented the saga in getting to this point since the engine was built. Suffice to say it has been rather testing of ones character and resolve!

Anyway, and with massive thanks to Paul at RS Tuning, the car is now making a healthy figure.

For now it’s finished, I have a hunch a few more bhp could be found by removing the several times cut-up custom centre I have with something like an Akrapovic, however that will have to wait for a long while yet.

RS Tuning RS Tuning