Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) 3.7 Roadster rev hang - how do you drive around it

As far as i know it is a hurdle on the way to success that nobody has cracked the password of the 3.7 ECU yet. So far everything has been an expensive workaround. But this knowledge is 2 years of age.

Blimey. That's us told, then.

My Friend in Ashland, Oregon has now driven His New Morgan 3.7 Roadster. Now My Friend is an acomplished Morgan Race Driver and has owned many Morgan Years and Models. I asked Him if He experienced Rev Hang? He knows the issue. He said No it is acting normally for a FBW throttle set up. He has only driven about 40 miles and the issue He is working on is setting the alignment properly. As the USA Morgans are shipped without engines and the engine installed at the Dealer the factory could not set the alignment properly. He thinks He now has it set properly but the weather is keeping Him for driving it at the moment as well as all the other things that go with the Christmas Season.

My friend has a new 3.7 -- he says that the clutch bite point is quite far out in the clutch pedal movement and he thinks it is a matter of getting used to a different style of driving. He reckons he has it "sorted`"

I don’t often post ...
I’ve had my 3.7 Roadster for 3 years (from new) and covered about 9,000 miles with a mix of pottering around and touring. Got to say I have not experienced any issues. I don’t thrash the car (enough power without that) but nor do I drive like an OAP.

I have read every comment I can find on this subject on TM plus others on Mustang forums covering the same engine installation. Reports vary from little or no rev hang to potential lethal effects of same on the Roadster, not fit for purpose etc.

Reading between the lines I would think my findings fall mid range in these reports. Let me make them clear though, the effect is ever present to some greater or lesser degree, is noticed at any revs above say 2500 rpm, at any throttle setting and on any expedient upward change, is nothing to do with clutch action, never experienced elsewhere and consequently not normal for any car never mind FBW. Having said that awareness means it doesn't detract from my enjoyment of the car on the road and most importantly doesn't make it dangerous or unfit for purpose IMHO.

Suggestions that money thrown at the issue or an enterprising concern cornering the market for a cure, I take with a pinch of salt. It hasn't happened yet to my knowledge in nearly seven years of Roadster 3.7 production and even longer for the considerably bigger Mustang 3.7 V6 market.

Phew!!

Richard,
I have to say when I have driven a 3.7 it isi there but like you I got used to it.
John

Exactly..

Similar to Richard W above, I can induce rev hang on mine if exploring the upper rev range & the fall-off of revs before the up-change is too slow & gives some nasty driveline shunt, if you train yourself to pause during this phase you can live with it but it's not ideal

If you tootle about & change up early I find it acceptable for touring style drives, but yes as others have commented the clutch can be sharp when setting off

I have spent well over 18 months, trying various alleged specialists, and eventually 2 of these have confirmed that the ECU is locked / cannot be tweaked, one of them was a Mustang specialist & has the licences to US Ford 'Stang ECU's and after many months had to admit defeat (he's done several late 3.0 Mogs)

I'm currently exploring a different route with another tuning specialist, after having a bit of a lightbulb moment - why not cheat the ECU by tweaking the signal it gets from the TPS rheostat ?

I am currently testing this live on mine, but obviously greasy autumn roads are not ideal - but watch this space

a slower change of gear helps and maybe you could experiment with that.

Isn't that the general consensus for dealing with the problem?