My thoughts too
A good way to push the wind up those curly runners and you’ve already strengthened the bottom end. I bet you wouldn’t need much of an intercooler too if you were only looking for a modest boost.
I've fully costed out the idea and it looks like this:
1. £1,000 for the bracket required to fit the Rotrex supercharger
2. £1,750 for a T2 upgraded recon Rotrex C30-94 head unit with traction oil
3. £1,500 for intercooler, bigger injectors, hoses, clips, belt etc
4. Probably wise to budget £1,000 for a dyno tune as I'm not tuning the supercharged Monty on the road
So thats £5,250 plus fitting if I farm it out, so maybe budget another £750 in labour. That brings the supercharger project to
£6,000 all in, and with 7psi of boost will safely take Monty from
182hp and 174 lbs/ft to
280hp and 260 lbs/ft.
The thing is it also adds complexity and loads my insurace premium quite a bit, spending £6k to introduce a number of potential points of failure also doesn't fit my brief, Monty is meant to be fast but he must also be turn-key reliable. I suspect my other goal of maintaining perfect drivability with a Rotrex supercharger can be met, but I'm pretty sure the 38mpg at a steady 75mph that I've somehow miraculously retained in Stage 3 tune, would be lost for ever.
I also think we've put enough additional meat on Stage 3 Monty's bone to keep me entertained for a while. The new figure of 182hp that arrives at 6,800rpm isn't earth shatteringly greater than Stage 2 Monty's 173hp that arrived 300rpm lower, but it's the engine's ability to now hold onto the new peak horsepower number all the way out to 8,000rpm that's effectively given me what feels like a whole new engine. However, while the 8,000rpm thing is fun, it's not like I'm using Monty's extra rpm capacity on every drive, because TBH 8,000rpm is a bit too bonkers for the road.
What you do tend to use on every drive is torque, Stage 2 Monty made 158 lbs/ft at 5,500rpm and had a very flat torque curve, this was impressive especially as he was also already producing 70% of this peak figure from 3,000rpm, which made for a really fun drive. However, Stage 3 Monty is on another level again, torque is now peaking at 174 lbs/ft at 5,800rpm only 600rpm higher than before, but more impressive still is that he now litrally makes 10% more torque
everywhere!!! while also still producing 70% of the new higher peak torque figure from 3,000rpm, so somehow, and don't ask me how, Monty's extremely flat torque curve has also been retained.
At roughly only 930kg the light weight and very smooth driving Stage 3 Monty is now plenty fast enough, to my amazement I can still trickle through town at 1,500rpm, then at the other end of the rev counter I can cleanly wind him all the way out to 8,000rpm now! But it's the very generous torque filling in the Stage 3 Monty sandwich that satisfys my real world appetite for additional performance, accesability is key here as all that extra torque can so easily be called upon at any time with just a gentle prod from my right foot.
I really do'nt think I need to be spending £6,000 on supercharging Monty when I already have all that
