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EFI DIY ?


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EFI conversions are usually praised for power economy and reliability. Some of our members say they did their own system, was it diy installing of a kit of parts or was it trips to the brokers and scanning eBay gumtree etc? Not wishing to reinvent the wheel would any one of the true DIY converters please produce a detailed listing of the parts obtained from breakers etc to do the job.

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Good afternoon Eryn,

This was my installation.

 

Materials desciption Cost £ Supplier

ECU

Microsquirt V3 300.00 Trigger-wheels

USB serial adaptors for above 5.00 Trigger-wheels

Wiring harness 12" (delux loom kit) 18.00 Trigger-wheels

Trigger wheel (7.25" x 5.75") 25.00 Trigger-wheels

Crank sensor+connector: 20.00 Trigger-wheels

Sensor bracket 15.00 Trigger-wheels

Relays x 2 30.00 ExtraEFI

New fuse box + fuses 20.00 Ebay

Shielded wire 4.00 Trigger-wheels

Water temp sensor 20.00 ExtraEFI

Tuner Studio - Software 65.00

Fuel System

Fuel pipe braided 20.00 Ebay

Fuel fittings AN6 various 80.00 Ebay

Injectors 156cc/min second hand

Second hand Ford or BMW? 35.00 Ebay –

Audi 2.6V6 Fuel injector connector kit 15.00 Trigger-wheels

Fuel rail 40.00 Trigger-wheels

Fuel pump Bosch 070

(130litres/hr at 44psi (3bar)) 72.00 Ebay

Fuel regulator 44psi 50.00 Ebay

Fuel filter Using original

Induction

Throttle bodies –

Old PI 35.00 TR-Register

Inlet air temp sensor IAT 21.00 ExtraEFI

Manifold air pressure MAP sensor 35.00 Trigger-wheels

Fabricate plenum 100.00

Single throttle body + TPS.

Modeo 2.5V6 18.00 Ebay

Vacuum hose 6.00 Trigger-wheels

Idle Valve - Bosch 20.00 Ebay

Cone air filter 20.00 ASN

Air filter connector 20.00 ASN

Idle valve filter 5.00 ASN

Ignition

EDIS module: 6-cylinder 45.00 Trigger-wheels

Coil pack 85.00 Trigger-wheels

Coil bracket 20.00 Trigger-wheels

6-cylinder coilpack connector 20.00 Trigger-wheels

Plug leads (bits to convert existing) 30.00 Trigger-wheels

Exhaust

Wideband Lambda sensor

Full system with sensor + boss + plug 100.00 Ebay

Exhaust Y Piece 2-1 short

- Moss TH6003X 60.00 Moss

Exhaust Y Piece 1-2 long 130.00 Moss

Exhaust clamps various 50.00 Ebay

Edited by Steve P
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Hi
I converted my 6 in 1996, to Bosch “L Jetronic” EFI. By modern standards, it is fairly basic, with parts sourced from a Vauxhall Senator, with an ECU supplied by the late Mike Pumford. I kept the original manifolds and opened them to accept the larger diameter yellow injectors. The car starts just like modern it pulls smoothly even from cold and has covered 63,000 miles since being installed. Including 2 trips to Italy and 2 trips to Spain. I did all the work, in my modest garage. Obviously the parts I source are long since out of production, but it is proof that these projects can be carried out by the average punter. Also a number of issues I had to overcome are still relevant on a more modern set-up.

Mike G

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Very out of date and not including the ignition side (which is also long done)

 

http://www.shadetreegarage.co.uk/Megasquirt1.htm

 

This was a true junkyard-special made entirely from used parts, except for the MS ECU which was home-built from a kit.

 

It's done alot of work since then, including being thrashed all over Europe several times, and almost all the hardware is unchanged.

 

Some more here which was my PI conversion. Also mostly used hardware. Starts about post #10

http://sideways-technologies.co.uk/forums/index.php/topic/5167-nick-mk2-pi/

 

Have a poke around on here too.

 

http://sideways-technologies.co.uk/forums/index.php/forum/6-ignition-ecu-and-fuel-injection/

 

Nick

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Benefit and costs widely spread relying on the person

who does that job.

 

Also the benefit depends of the state of tuning of original engine.

 

A homemade EFI on a TR6 Carb was established by me

spending about 1000 Euros including buy & refurbish of

inlet manifolds with ball bearings.

Out of the box systems start about 2000 Euros and a swap

done by a specialist fully done might be around 4000 Euros

including setup on rolling road.

 

Mine is about 20HP over the carb version and accepts wilder

cams without lumpy idle what allows a gain in power for

the daily driver to about 35HP without running into trouble. So

where you can end at 135 HP tuned with carbs if you do not want

to sacrifice driveability the EFI can go beyond 170HP.

 

Fuel consumption is about 15% less to before if ignition control

is employed what I did and is included in my estimated costs.

This is not a must but as all requiered data are already in the EFI

its a good idea and easy step to do so.

 

Always keep in mind that a PI or carb can be trimmed for good economy

than the gain in better fuel consumption will be less and there is a gain

in power with the EFI and if the engine was set for power before the saved fuel will

be more than 15%. The benfit is that EFI can do both: Very reliable at part throttle

and perfect power development under high load.

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