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loopmuscle

gti conversions for dummies

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decided to make this thread so everyone can stop asking how to do the conversions.

also find out why everyone says polo gti looms are easier.

done this conversion three times now so iv got the idea how you do it

you will need

polo gti engine

polo gti looms inside and out

polo gti or lupo gti ecu

and if you have cable throttle get the gti, sport, pedal box

electrical

CENTRAL LOCKING

easiest way to do central locking is to use your old loom( if it has central locking)

strip the loom down starting from the drivers side door connecters seperator the central locking wires from the other wires.

do the left side door connector firstly to the fusebox and also to the drivers side wires where they attach. secondly down to the boot of the car where they lead to the boot lock and interior lighting.

do the same to the polo gti looms while also taking out the air pump pipes.

the boot wires need to be chopped or either the pins need taking out the connector blocks

once done put the old looms to the gti ( best to go fusebox first)

the polo gti looms may have extra peices going off near to the rear speakers these where the interior light sensor connects and are no longer needed

once all fitted, soldered,crimped etc

test the central locking using your original central locking control unit.

if remote test your fob should still work without reproggramming

wrap up the loom securly as you wont need to take that bit apart again.

this loom also does your electric windows if you have them.

LIGHTING

front light pins will need swopping and so do the rears

the 3rd brake light pin needs to be swapped over else you will find the 3rd brake light will not work ( obvs) but also the fuse will keep popping

the reverse light pin will need to be chopped and made into a double wire to use for both lights as the polo only uses one reverse light.

EARTHING/REAR RE-WIRING

the looms shape is diffrent to the lupo so your will need to unwrapp the whole of the rear loom to relocate the earths for the rear lighting ,fuel pump etc

the roof lining needs to be removed to swop the aerial cable to the other side or can be extended with more aerial cable.

ENGINE/GEARBOX

extra pieces will be need to do small but important bits of the conversion

the speedo sensor will need changing or chopping.

fitting the engine is just the same as putting the normal one in unless it is a 1.0 ltr then you need new engine mounts and a 1.4s,sport,gti gearbox

the gearbox bolts will need to be change for either gti bolts or you can chopp them to fitt

advice you to do the conversion on a abs type lupo as the abs one is more just plugg in and off you go.

the non abs will need you to rip the bulb out of the clocks and hide the wiring your chopp it.

throttle bodie has more air pipe hole in that will need either unscrewing and blocking or tubed to one another.

if you do not have air con take the pump off and the gti steering pump with it and replace with the 1.4 pump the belt you need is 11.4 s belt.

as for the cooling fan your need the relay off the gti that goes in the engine bay they are also on lupo gti's

connect this all up and get a garage to test it with daignostic tool

everything else is the same as the 1.4 so if you know how to take it now you know how to put it back in!

HEATING

the gti heaters use electric motors and a electronic computer to adjust the heating and location of the blowing air

you can fit these in or you can simple chop the live which is the black and red large wire and solder it, female connect it to the orginal heater connector with the earth done the same aswell.

everything else is a plug and play game

done this so people that want to do the conversion have an idea what there getting into!

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anyone who has done this conversion with lupo gti looms please tell me why it is more difficult?

and do the lupo gti's have central locking air pump units too?

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Are you a mechanic? Do you fancy doing another? Iv had one done my monkeys and its all gone wrong...

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hes qualified motorsport mechanic

ill try contact him for you today but i know he is busy because hes doing that conversion at the minute in his new lupo and my arosa but im sure he will help somehow

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Are you a mechanic? Do you fancy doing another? Iv had one done my monkeys and its all gone wrong...

hi mate

were are you based ?

if your local i can come have a noisy and see what damage they have done.

what is it car exactly not doing? does it turn over? fire up and die? nothing works at all?

what looms are you using?

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Rich is based in Northampton, about 1 hour from Hinckley.

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okay mate

well if he can tell me whats up with it?

i can help out :)

As far as I can remember from looking at it and speaking to Rich...

The garage have botched in a Polo GTI engine with the cylinder head from his Lupo sport engine and the cams from the Polo GTI engine.

It's still running the original Lupo sport ECU.

Basically it's Frankenstein's monsters GTI engine conversion!!

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As far as I can remember from looking at it and speaking to Rich...

The garage have botched in a Polo GTI engine with the cylinder head from his Lupo sport engine and the cams from the Polo GTI engine.

It's still running the original Lupo sport ECU.

Basically it's Frankenstein's monsters GTI engine conversion!!

okay the problem is with that is the crank flow is different from the 1.4 to the 1.6 someone has done this before and what they had to do is take out the crank sensor timing gear and swop them over so the ecu new when to fire correctly.

but to be honest i couldnt see that working amazing and you might as well block the egr valve and skim the head to the same compression of the gti or do the gti conversion properly

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Aye, All needs ripping out and doning again..

hi mate did they start mixing the engine together?

if i was you id do it yourself or get someone who knows these engines to re build it then do your looms and ecu for you.

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hi mate did they start mixing the engine together?

if i was you id do it yourself or get someone who knows these engines to re build it then do your looms and ecu for you.

Indeed, propper mechanics with 2 proppper units, but they are terrible,

Yea, i may PM you if i decide to re do the gti conversion,

Thanks.

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So what is the advantage of using a Polo GTI engine instead of a Lupo GTI one?

Sorry if i'm missing something obvious!

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It fits easily.

The Lupo GTI engine is a pig to fit and requires a lot of new parts, the Polo GTI engine will nearly drop straight in.

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That's because you took it to some pikeys! Any progress in getting money out of them?

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I Think with the right tools and all the bits you need there and then you could probably do this conversion over a weekend with two people. Hope you get yours sorted Rich nothing worse than a pikey job. :)

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twelve days to do an entire polo GTI reshell, four of those I was working, a couple were spent stripping both cars.

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weekender.

Edited by Mitchell

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I have a sport, can I use my sport manifold, engine mounts, drive shafts ect? What other parts will I need apart from loom, ecu and engine?

Edited by ChristopherReeve

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yes you can use your exhaust manifold. gearbox. driveshafts. radiator. most of your coolant piping but you need to get oil cooler linked up.

you can use all the engine mounts as long as its 16v engine.

you can use the flywheel clutch etc.

the main things you need is complete whole car wiring loom. engine. ecu transponder box and chip. decent tools to get interior and dash out.

you will need the gti intake manifold and gti airbox.

there could be a few more bits.

if you pm me with any questions or problems its fine, me and loopmuscle are currently in a 1.4s to gti conversion with front hubs rear beam, abs system so we will be doing everything needed with new looms the lot so just drop a pm

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1.0 engine and mounts are the same for the Polo GTI conversion.

Gearbox and engine mount is a direct swap on a Lupo GTI engine and gearbox.

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8v mounts are sat a few cm set further back, they were on my mk4 polo and the engine bays are the same

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