1.3 to 1.3GT engine

Hi i've got a polo gt at the moment! and am buying a mint 1.3driver mk1 and i'm wanting to put my GT engine in with cbr600 throttle bodies etc! but want to know everything i am goin to need for this converson! i've got engine electric box etc but wot else do i need for it!
Has anyone done a write up on this conversion???

cheers
Iain

You'll need to make an engine mount if you're using the GT 5 speed. Use the Polo gearchange block that's on the end of the rod coming from the car. You'll need to mod the exhaust downpipe/system. I used a GTi system as it's got the same bore as the CL, which is what I fitted in mine. I think the GT is the same. I removed the cat, welded on a boss for the lambda and made a pipe to go back to the system. I used the Polo rad, with the mk1 fan and surround, and a mk2 Golf header tank. The drivers side engine mount bolts straight onto the Polo engine.

sounds preety easy the mk1 has a polo 1.3 engine and 5speed as i 've found out 2nite so the gerar box should fit straight in!
what about the wiring for the injection system and drive shafts???? also the engine (polo1.3) has a 4branch so that should mate up the exhaust system anyway as it's on the car now!
anything else i should know about???

I'm using the standard 1300 driveshafts. The wiring involved 6 wires. There will be a gap between the end of your manifold and whichever system you use and I doubt the ends will be inline, but this gives you space to make them fit together. The only thing you haven't touched on is the fuel supply. If you are going with the standard injection then you need a lift pump and presssure pump, using the standard components, or an aftermarket pressure pump that is capable of some suction. I'm using the GTi tank which means that I can't use a lift pump from another VW as there's a swirlpot beneath the sender opening. I am using the Polo pressure pump, but this has lead to some problems when I've run out and had to drop the pump off the car to fill it with fuel. I've also suffered debris in the pump as the lift pump is surrounded by a guaze filter. I got around this by using a pre filter. I've mounted the main filter where the washer bottle goes and used a Scirocco one instead. I've also replaced the steel fuel lines with 8mm plastic ones, which match up with the Polo lines.

and when i have throttle bodies on what do i do for engine managment????

What make of management do you want to use? There's so many options and everyone seems to have their own favourite. How much do you want to spend and how much do you want to fiddle with it?

well basically i jst wnt it to run lol i'm getting a pipercam with vernier pully heads already flowed and got a 4branch so not bothered about different rev ranges mapple this mapple that jst wnt a gt engine on throttle bodies running about 120-130 bhp

Megasquirt if you're into electronics or talk to Wayne at Chipwizards about using a Magnetti Marelli 8P, which is a standard ecu from most pugs and citroens. Cost ?20 from a scrapyard, but can run anything. You then pay for a loom, or bodge one from the donor car, and the cost of mapping, which you will have to pay whatever you use.

ok now that area is sorted where and how much should i expect to pay for a set of cbr600 throttle bodies?? and where can i get the custom inlet manifold made up? how how much? + i take it i need to get the throttle bodies to be re-jetted? where can i get this done and roughly how much will it cost me!
then is it a case of fitting the inlet manifold throttle bodies and engine manegment and off i go???

oh where fo i do about throttle cabe and linkage do i use the polo throttle cable and lingkage on the throttle bodies???

hello!

how the conversion going?

i've been looking at doing a simlar conversion on my 1.1, only i was going to use r1 carbs. theres a company that custom build manifolds www.boggbros.co.uk they also offer a rejetting service for the r1 carbs, i think they quoted me about ?170 for the manifold!

mark.

hi! well i've decided not to go ahead with the carbs because it's going to cost to much to get them set up properly and due to the nature of the carbs it wnt suit my driving style so i have opted for TURBO i'm using a t2 garrett and r5 carb should be good for 130bhp

sounds intresting!! how far along are you with the conversion?

mark.

i'm still getting bit for it but got my selft a brand new t2 for a very good price got most it's jst need the uprated fule pump and to rip my gt engine out of my old gt and put it in my mk1 so hopefully not long now

If you are going to forced induction route then you are better off using a G40 block and head.  The GT has the highest compression out of all the Mk3 Polo engines which will need to be lowered significantly to fit a turbo - the G40 engine is designed for forced induction out of the box and has the lowest compression ratio off all.

all well in saying that but how many g40 block have you seen up for sale???? i'll be using compition headgasket and flat top pistones custom made for my gt sou should be ok bt still only going to be using 4-8psi

*You cant re-jet throttle bodies, you can only chance the injectors (if its off a big bike you shouldnt need to. With re jetting you are thinking of carbs. A set of 4 jets will cost ?90 so try to find out roughly what capacity bike equates to the same as your car and you may get away without.

Im definately going to bike ITB's or carbs but cannot decide which. Carbs are easier to bodge on and will probably end up cheaper but you CANNOT get the fuelling perfect through the whole rev range with carbs, it just wont happen. With throttle bodies you can get the fuelling spot on with a lap top but u need to buy the ecu and do some wiring and PUT TEMP SENSORS IN THE RADIATOR AND INLET MANIFOLD. Its in caps cos everyone forgets that lol.

Good luck, share any info.

Will

im looking at doing this in the next few weeks.

im looking for a gt engine with everything. can i use my golf driver fuel tank and the polo gt fuel pump or will i need to do other stuff to it.

what about the driveshafts? if they are supplied with the engine is it better to use these. will the exhausts line up etc.

very interested in this conversion

I used a GTi tank with my SPI conversion. I've since decided that I could have got away with using the normal tank with an intank pump. I think it's a Scirocco one that fits. Don't know about the pressure though. I have been told that the normal pickup pipes will work OK, but my own experience of the Polo pumps is that the pressure pump is not very good at sucking so running out of fuel is a major bind. They are also very susceptible to small debris as I found out daily when I first put the car on the road. I now have a pre and post pump filter. The standard 1300 shafts are OK. They use the same CV's as most VW's. The GTi has the same length long shaft but the shorter one is shorter than the 1300 one. With the Exhaust, I cut open the cat to find that there is short straight pipe at either end. I but welded these together and sleeved the join. I then drilled through from above and welded the lambda boss in. I used a GTi system as it matches the bore of the GT/Cl downpipe. This then leaves you with a gap between the downpipe and system. The 2 pipes are not inline either, but are parallel, so I got some matching pipe and made it fit the gap. This leaves the system with no method of flexing. I use a poly rear mount to try and reduce the rock of the engine. It seems to have worked so far. The car's been on the road for over a year and regularly gets a good thrashing.

so there is nowhere to put a bit of flexi exhaust in the exhaust system anywhere

I'm sure you could. I didn't really want one, so reduced the engine rock to a reasonable level. The rest of the system goes up and down quite a bit.