Originally Posted by JohnHarris
I would if possible have a drive in either an ARP4 with 225 bhp orr 2012 Plus 4 Supersport with 200bhp, and see what they are like to drive and whether the extra cost is worth all the effort, with the resultant drive the extra power produces.

Come to that drive a Roadster and see what that really handles like with the extra power and torque especially in the wet.

The Roadster never interested me, in my mind a Morgan should be four banger that revs.

I'd love to see a trustworthy dyno graph for the ARP4, and the 2012 Plus 4 Supersport. Both run ITBs that I've resisted so far as I'm happy to sacrifice a bit of top end for the broad spread of torque, and the 174 lbs/ft I've achieved using the FF long runner inlet.

I'd be super keen to study the torque curves and peak torque numbers produced by the ARP4 and a 2012 Plus 4 Supersport thinking

The nearest I could find is this very strong Caterham 420 that's had a conversion to ITBs.

[Linked Image]

To be fair this 420 is making very 'Stage 3 Monty' like torque, actually up to 5,500rpm the whole graph is a carbon copy of Monty's graph show below, however after 5,500 the Caterham properly takes off!

[Linked Image]

While Monty's horsepower line goes flat from 5,500rpm to 7,900rpm, the Caterham goes from a Monty matching 180hp at 5,500rpm to 233hp at 7,800rpm, this is also only 8hp more than Morgan claimed for the ARP4 so it's all looking very believable indeed.

I have to concede the Caterham graph is telling me exactly the same thing Dale Bladen at Bailey Performance told me last year.....

"Dave, you need to move on from that Fusion Fabrications inlet, you'll never make more than 185hp on that thing, let me put Monty on a set of ITBs and not only will I match the torque the FF inlet makes, I'll also give you your missing top end!"

I have a great deal of respect for Dale, and now I've seen the ITB converted Caterham 420 graph and that it makes an excellent 170 lbs/ft at 5,250rpm with an equally Monty matching flat torque curve, l may have to take him up on his offer this winter.

Could this mark the end of the road for the Fusion Fabrications long runner inlet thinking