Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) P4 with flash. verdict

I think about to start with the easy (and cheap) way. At first the flash, than see further.

Is here someone around who has the graphic for a standard GDI +4 vs. a flashed one?

The bloodless performance between 2000 and 3500rpm is not the point for a sportscar. Every white van goes faster
In the time I must shift two gears back.

René

I am afraid that is the difference between a naturally aspirated and a turbo charged engine. The turbo diesel used in the white van probably hits peak torque at a little over 2,000 rpm.

I don't think so... Every engine must rev.

If you have a look at the torque graph you see a heavy break in this area. I'be got an old 1000ccm MINI an a Harley, both
non-turboed. Both rev up with a straight increasment of torque, no break.

Pedal to the metal an they go on. In the MOG it's like you brake...

René

Get the flash Rene. Steve T had that done and is pleased with the result.

Then decide about the manifold and cat. As I said above, my car freed up having first changed the exhaust.

My Plus 4 is much more fun after the upgrades - all done by Williams. Definitely more performance lower down the rev range. I wasn't a fan of revving the engine much before, but I really enjoy pushing it more in 3rd gear now!

RBW Thanks for the reply: the graph shows very much what it feels like. The other day I drove my Roadster and P4 back to back on identical routes. Traffic was equally light on each trip with the odd lorry on long hills. Maximum fifth gear speed slightly topped 90kph. The difference in acceleration is noticeable of course in that second gear in the Roadster, is a massive shove which quickly carries one past an obstacle: in the P4 however it seems as quick : it is the delivery which is different. I think it was Dave W who thought that the P4 did not give much away to his Roadster and I tend to feel the same. Second gear will run out at just above the British national motorway speed limit whereas the Roadster needs a gear change up before 60mph. Tractability in the latter is slightly better but again not by much. I have now reached 4000 klms in the P4 and the exhaust is still clean. I can only keep one of these cars and the decision is not easy. I suspect the Escape engine is bullet proof whereas I am not so sure of the GDI. If I could have my Roadster in Black, with the removable rear panel (the Roadster is the Sport model) and alloy wheels, and had the same Suage Green interior then I would lean its way. If the P4 could have the 3:0 litre engine, I would keep it.

It's not the point that the (2018) +4 is running as a sportscar from 3500rpm on.

But in the real live you're on the road in the forth with about 2000rpm and legal 60mph/100km/h.

If you want to go faster, forget it. If you stay in forth it feels like you brake, if you shift back the MX5 box may be good, but it's not the toy for a fast shifting. My old Mini is far better (a lot of worlds)... In this time you think about it the white van (or a grandma in her diesel turbo) is away.

The thing is a frustrating rev from 2000 to 4000rpm.

As I know from classic MINI and Harley I look forward for "Stage1". I think that's the flash.

Thank for the great and lots of ideas.

René

Get a 4/4 - there is no remote change mechanism to slow the change down - which makes the gear change exactly as Mazda designed it.

So are the 4/4 and +4 Mazda boxes different with regards to the linkage mechanism?

It seems so. The Mazda forums speak of an oil reservoir under the gearstick, which isn't apparent on the Morgan.