Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) +4 gdi tuning

Hi Tommog

Yes a new exhaust and sports cat further down from the exhaust ports just like the Librands.
I also had to have O2 sensor wires lengthened but if factory fitted they would do that I'm sure.

With my 2005 PLUS 4 on 4th gear

4000 rpm 77 mph (124 km/h)
6500 rpm 125 mph (202 km/h) not reachable... and never try

with 5th gear
6500 rpm 165 mph (266 km/h) completly theoritical, maximun speed estimated on 4th 186 km/h, 184 km/h on 5th (without wind!)

speed at 1000 rpm on 5th gear 25.1 mph (40.4 km/h)
Porsche 919 roughly at 1000 rpm on 7th gear 27 mph (43 km/h)

https://www.youtube.com/watch?v=nARVZVQqnWM


Caterham R500 17.6 mph (27.6 km/h) at 1000 rpm on 6th gear.
6th gear 1:1
axle 3.92:1
tyres : 215/50 R13

Morgan is more close to the Le Mans winner Porsche 919 than to a Caterham... but not with the same power in both cases.

Ratios are to high and particularly to cruise at 60 mph and get more acceleration. A real problem with speed limitation.