Building an engine for Economy
Turbo Mini Forums

After finishing my track based 72 Turbo am now planning to Turbo my 77 Clubman with injection. I plan to use the car to travel long distances, including 'The Italian Job' mini run, Rivera Run etc and minis shows. Considering fuel prices, am really keen to build a setup for best economy and reliability, not all out power. My agenda is

1. Economy
2. Low internal / drive by noise
3. Strong low down torque / must be able to pull fibreglass mini trailer.
4. Reliabilty
5. Very smooth & traffic friendly

My early ideas consist of

1330cc ?? or 998cc?
Rebuilt standard Renault 5 T2
9.2-1CR
SW5 cam
8psi Boost / 120bhp max
Custom intercooler
2.76 FD
4 Pin
Helical box & drops

Am planning on either using a wet manifold injection setup or SC 7 Port setup with custom plenum.

What do you guys think, any suggestions?

Here my current setup, that as proven to be quite disapointing for a road going car. The 7 Port might find its way onto my trackday project though.

Edited by alaskanow0 on 11th Jan, 2012.

Class C 3rd Place Avon 2011 14.18 @101mph

how about charging the head you have there?

just use a set of gsxr TB's and see if you can use an upside down metty manifold on the exhaust side.

The huge port size seems to effect air speed and reducers low down torque and power. Ive done back to back testing with both 5 & 7 port and found 5 port much better until 3.7k. I have a set of TB's for the webcon head already that I plan to use on another n/a trackday engine. Ive also have got a mirage manifold that I can use on the clubman as I dont want any bulkhead mods.

Class C 3rd Place Avon 2011 14.18 @101mph

Based on your 1-5 list I would fit an MPI engine and set up with the "90banana" kit and leave it at that.

My home built 1275 with TurboPhil head, MG NA cam, GT1752 and megajolt gave just under 140 bhp at the Northampton RR day and averaged 40 mpg on my trips last year to Dundee and Rotterdam, cruising at 70 ish.I get 35mpg all the time unless I,m clogging it and the car weights 890kg. This should meet your criteria surely ? (and at a lost less expense)

Like most people on here I have found the Tt 1752 transforms the engine, making it much more user friendly than the T series.

I think, 998 , well ported/size head, mg cam and the t2

rick

oh and some more pics of the clubman, it looks stunning

Standard Mpi engine is way to boring, Am after something a little bit unusual as well as practical. Im leaning toward injection to broaden my knowledge but still want the thrill of boost. 90bhp from an tune mpi is not enough power.

Class C 3rd Place Avon 2011 14.18 @101mph

i think i would look at building a small bore 998/1098cc + t2 should make a nice nippy motor

Yes i moved to the darkside

Instagram @jdm_brett

Sounds similar to what im building 1310cc with 10cc dished omegas should give a cr of 9.1

Tadge44, I assume you are comparing the GT1752 to the standard T3. I've been told the T2 is very similar to the GT1548. I alteady have the newly built turbo and mirage kit, so I'm going to stay with that for a while.

Class C 3rd Place Avon 2011 14.18 @101mph

I'd be tempted to go for a higher CR. How about trying 10:1?

If you're going down the EFI route and get it right, it should be doable, and it would help keep it a bit more lively off boost.

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1/4mile in 13.2sec @ 111 terminal on 15psi

I'd be going for as high a CR as you dare too. I'd personally go no further than about 9.4:1 (metro turbo std cr). with a good intercooler 12psi should be achievable.

If something is worth doing, it's worth doing half of.

off on a tangent but what about a small turbo diesel? reliable, efficient and plenty of torque

Edited by Rob Gavin on 9th Jan, 2012.

This engine was built for economy and did not dissappoint. Long inlet runners are good for low down torque. Port injection gives optimum fuel distribution.

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=129557

I would not want to use it with a 2.75 diff though.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

How about a 1430, low boost, still with the mirageand t2 but with a sc injected carb setup??

Edited by cossierick on 9th Jan, 2012.

Wouldn't you have to set the wet manifold system to rich overall to prevent the outer cylinders from running lean? Defeats the object if you do.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

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1/4mile in 13.2sec @ 111 terminal on 15psi

For info. Wintersurfer is using 10psi on 8.9:1 and making 150 nanas.

In the 13's at last!.. Just

But doesn't his do about 6mpg? Lol

If something is worth doing, it's worth doing half of.

Less probably! Lol

If he stopped being so tight and forked out for a RR session or lamda it'd be better.

In the 13's at last!.. Just

rather than using you hand me down needles eh!

I would love to up the CR to 10-1, but only if I go 7 port with equal AFR's. The Wet manifold is cheaper and easier but I would need to built in a safety margin and I know it wouldnt be perfect. I would love to have a go at siamese code but I find it hard to understand and it could cost as much as the SC 7 Port in the long run.

Edited by alaskanow0 on 9th Jan, 2012.

Class C 3rd Place Avon 2011 14.18 @101mph

http://www.jbperf.com/

Edited by matty on 9th Jan, 2012.

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1/4mile in 13.2sec @ 111 terminal on 15psi

ive seen 45 mpg on my 7 port, its not that good now as Ive ha to richen it upwith the new cam to get it to run smoothly.