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Turbo Plus 4 Plus -- final report #573352
23/04/19 03:44 PM
23/04/19 03:44 PM
Joined: Jul 2014
Posts: 569
Cornwall
griffo Offline OP
Talk Morgan Regular
griffo  Offline OP
Talk Morgan Regular

Joined: Jul 2014
Posts: 569
Cornwall
Ecoboost Plus 4 Plus (final Report)
SEE MORGAN PHOTO GALLERY FOR PIX

I must be setting a trend with "Possum", the turboed "Plus 4 Plus", since MMC have followed suit with their turboed Plus 6. Their yet to be announced new Plus 4 will have a turboed four cylinder BMW engine.
Possum’s rolling road tuning took place on March 20 at Stanton Motorsports (just off the M4) and went very well.
Possum had been carefully run in for 250 miles. All the instruments working fine, as per the standard car, and careful brim-to-brim tank measurements saw 31.7 mpg during test drives. Touring consumption seems to be around 36 mpg.
With minimum boost (0.4 bar) the engine already felt very pokey. On the dyno the boffins from MBE Systems progressively increased boost to a still-modest 1.0 bar with fuel map to suit and the result is pretty amazing. Target figure of 240 flywheel bhp was reached (more is available with extra boost) but the all-important torque figures exceeded expectations.
Torque curve is very flat from 2500 rpm to 5000 and peaks at 3000 rpm with 280 ft lbs (standard GDI Plus 4 only manages 145 ftlbs). To sum up, very driveable, loads of low down omph and no lag thanks to the advanced Borg Warner twin scroll turbo.
One major difference from the standard Plus 4 is the smoothness of the engine, which is also quite a lot quieter since the turbo acts as a slight silencer. With a high quality 200 cell EU4 compliant cat fitted the emissions have been judged “well within limits” and it will fly through the test, according to Possum’s local Morgan dealer (and MOT test station).
Having driven a few Rover-engined Plus 8’s over the past 50 years, “Possum” feels considerably quicker – and is much lighter.
The only downsides were self-inflicted. I fitted a new and rather fierce MX5 racing clutch and lightweight single mass flywheel instead of a standard MX5 clutch and the dual mass flywheel which came with the new engine. As a result it was initially a little juddery moving off from a standstill – this is hardly noticeable now since the clutch had bedded in. If doing it again I’d go for the standard MX5 clutch which should cope fine given the light weight of the car. Also, on the rolling road, we blew off a turbo boost pipe between the intercooler and the throttle body. This was because I had to shorten some of the alloy pipes to fit and they lost their “swage” on the ends for the Jubilee clip to snuggle behind. I found an inexpensive swage-maker on E-bay so all the pipes are now very secure and have the extra security of Jubilee clips lock-wired together.
So I’m a happy bunny and can’t keep the smile off my face. Icing on the cake was my insurers only asking a reasonable £130 a year extra for the uprated car.
Possum was ordered from new with a limited slip differential and I had already fitted a panhard rod. With all the extra torque anti-tramp bars were considered advisable to eliminate spring “wind up” and those nice people from New Elms provided a pair with machined stainless spring plates which are a work of art. I took boss Tim Ayres for a brief passenger ride in the car and he emerged impressed.
Several of you have asked about carrying out your own Ecoboost conversions on GDI or Duratec Plus 4s, or having one done. If so you need to contact Tony DeSciscio at:
descisct@gmail.com
Finally, “Possum” will be at the Prescott “Thrill on the Hill” on Sunday August 11th – see you there.

Re: Turbo Plus 4 Plus -- final report [Re: griffo] #573357
23/04/19 04:05 PM
23/04/19 04:05 PM
Joined: Aug 2013
Posts: 456
R
Rovert Online content
Learner Plates Off!
Rovert  Online Content
Learner Plates Off!
R

Joined: Aug 2013
Posts: 456
Most impressive work.


Brian
Jersey and Spain
Re: Turbo Plus 4 Plus -- final report [Re: griffo] #573381
23/04/19 07:48 PM
23/04/19 07:48 PM
Joined: Aug 2015
Posts: 303
West Dorset
R
rid967 Offline
Learner Plates Off!
rid967  Offline
Learner Plates Off!
R

Joined: Aug 2015
Posts: 303
West Dorset
Amazing and courageous journey. Thanks for sharing. Fabulous car and quite unique. If only the ARP4 had been like this!


3.7 Roadster
Porsche 964 C2
JCW Mini Cooper S Cab
BMW 1200 GS
+4 4 1995-2002 / LM 62 +8 2002-07
Re: Turbo Plus 4 Plus -- final report [Re: griffo] #573383
23/04/19 07:57 PM
23/04/19 07:57 PM
Joined: Feb 2012
Posts: 5,508
Taunton
deano Offline
Charter Member
deano  Offline
Charter Member

Joined: Feb 2012
Posts: 5,508
Taunton
You well and truly should feel a happy bunny, congratulations.


Martin (Deano)
Re: Turbo Plus 4 Plus -- final report [Re: griffo] #573396
23/04/19 09:27 PM
23/04/19 09:27 PM
Joined: Sep 2011
Posts: 13,346
Mandello del Lario
Gambalunga Offline
Member of the Inner Circle
Gambalunga  Offline
Member of the Inner Circle

Joined: Sep 2011
Posts: 13,346
Mandello del Lario
Well done. I only wish I could do something similar.

Torque and power figures like that would be supurb in the new "Plus 4" or whatever they decide to call it. More power would become much more costly in Italy and it is the midrange torque that really counts anyway.


Peter

[Linked Image]
Re: Turbo Plus 4 Plus -- final report [Re: griffo] #573402
23/04/19 10:03 PM
23/04/19 10:03 PM
Joined: Sep 2009
Posts: 5,274
Köln Germany
Heinz Offline
Charter Member
Heinz  Offline
Charter Member

Joined: Sep 2009
Posts: 5,274
Köln Germany
Well done Griffo! Your Mog is one of a kind. I have rent a 2.3 Mustang in the States and I can confirm that the twin scroll technology is a very good step forward in turbo development. Your car must be amazing. She combines the very Trad concept in combination with a modern engine which is unique. We will see similar engines in MMC future but in combination with a „modern“ car suspension which is not a bad story on its own but you have realized a phase which will not be duplicated any more.


'14 4/4 graphite grey
Re: Turbo Plus 4 Plus -- final report [Re: griffo] #573417
24/04/19 03:32 AM
24/04/19 03:32 AM
Joined: Mar 2015
Posts: 1,115
Vienna Austria
A
auster Offline
Has a lot to Say!
auster  Offline
Has a lot to Say!
A

Joined: Mar 2015
Posts: 1,115
Vienna Austria
Congratulations on your achievements with this car; most impressive. Also many thanks for such excellent reporting of the journey and destination. I'm sure you are inspiring others.


1968 4/4 1600
1950 Auster J5B
Kitfox S5 Outback
Jodel D9
1988 Peugeot 205 GTI 1.9
Re: Turbo Plus 4 Plus -- final report [Re: griffo] #573425
24/04/19 06:56 AM
24/04/19 06:56 AM
Joined: Feb 2016
Posts: 2,844
East Harling, Norfolk UK
Richard Wood Offline
Talk Morgan Expert
Richard Wood  Offline
Talk Morgan Expert

Joined: Feb 2016
Posts: 2,844
East Harling, Norfolk UK
Great info Griffo, you must be over the moon that all the sweat and tears have paid off.

Given the better than expected torque, how do you feel about the standard MX5 box taking it? I believe the six speed version is stronger although you probably don't need the extra ratio.

The cars light weight will help of course. Many years ago whilst building a Cobra replica with a big valve Ford 351 V8, I was told not to worry about the relatively weak ZF gearbox mated to it as the cars light weight would not allow the full torque through it - traction would break first wink


Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1960 Velocette Venom
Re: Turbo Plus 4 Plus -- final report [Re: griffo] #573429
24/04/19 07:26 AM
24/04/19 07:26 AM
Joined: Dec 2008
Posts: 18,608
South Yorkshire
DaveW Offline
Roadster Guru
DaveW  Offline
Roadster Guru
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Joined: Dec 2008
Posts: 18,608
South Yorkshire
Amazing job. wine


DaveW
2005 Corsa Red Roadster S1
2016 Saffron Yellow (Narrow) AR Plus 4
Re: Turbo Plus 4 Plus -- final report [Re: griffo] #573435
24/04/19 08:16 AM
24/04/19 08:16 AM
Joined: Jul 2014
Posts: 569
Cornwall
griffo Offline OP
Talk Morgan Regular
griffo  Offline OP
Talk Morgan Regular

Joined: Jul 2014
Posts: 569
Cornwall

"how do you feel about the standard MX5 box taking it?"

Hi Richard,
I did have some worries on that score but Westfield Cars (who use the same ecoboost motor mated to the 5-speed MX5 box) said they have had no issues, even in track versions boosted up to 300 bhp. Apparently the latest iteration of the Mazda box is much stronger than earlier ones.

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