I know this has probably been covered a few times but i was reading an article in a magazine today and it said that all you need to do to upgrade to a ko4 turbo is fit a new exhaust manifold, s3 injectors and ideally a bigger intercooler,

is this true? if so what kind of power would it be running?

I thought i would ask the question as it seems a bit simple.

cheers

about right there is a ko4 that will bolt straight on the k04-1 but only good for 250max

or you have the k04-21which will req manifold and downpipe. 4 bar regulator and uprated fuel pump. also injectors and a frountmount. if you get an equal lenght aswell should be good for 300hp....but should really upgrade the clutch and think of a lsd aswell...

needs more than that, oil lines, water lines, downpipe, turbo inlet pipe, boost pipes to name a few.

power wise if done properly expect mapped S3/LCR number(260bhp ish) but unless you do the work yourself and you get the bits cheap you might aswell stick a garrett or ihi on it as the costs don't have to be that much different.

yep sorry all the other little bits and bobs...

as far as the bt route if you want a laggy car then that the way to go but if you want low and mid then the k04 is a great setup. comes in at 2k pulls like a train....go big t and you will be going down the road of new internals etc etc

i no what im going to do:D

but isnt that why the IHI is popular is it kicks in quite low down?

the ihi comes in at about 3k and the k04 comes in at 2k as with the ihi you are taking the car to the limit of the internals to be honest...

thats why i will be going for a k04 in the future

I was just thinking about this today. I think it could be quite a cheap project if you do it yourself.

We all know that second hand Audi TT bits come at a relatively cheap price so say we get the Maf, injectors,manifold,oil lines, TIP and turbo etc secondhand then get say powerflow to mod the exhaust. Then get a remapped TT map which should go onto the Vrs ecu and install yourself or even a secondhand ECU i think, we're nearly there.

Just thinking aloud Lol

waste of money mate, you'll spend nearly as much but end up with less power and no where to go. if your going to go to the bother of doing it you might aswell do it properly, there is a huge variety in turbo's that fit a T25 flange for example that range from about 250-450bhp so they don't have to laggy but also gives you a further upgrade path rathr than a dead end.

Why less power?

I see where your coming from Ben and that would be the best route but you would need a custom remap £££ also a few other bits which would not be easily available and cheap, also the vrs bottom end will only take about 300bhp from reports on here. Would 270bhp be achievable?

i really like the k04 upgrade as it comes in at 2k yes its not the best for top end but then where are you going to need the top end power??

if you use a equal length manifold etc etc a k04 should be good for 300bhp put that together with a big brake setup and good suspension im sure it will beat most bt cars:thumbup:

and all this and you dont need internal upgrades.. as soon as you go down the bt route your talking rods, pistons etc so all in all the best one imo is the k04 route....

I have a low mileage K04 turbo and matchng manifold I could be tempted to part with.

You are all wrong.

Personally I would stick with the standard set up and not change a thing.

Your car will run better, be worth more when it's time to sell and then there is the cost to consider.

You are all wrong.

Personally I would stick with the standard set up and not change a thing.

Your car will run better, be worth more when it's time to sell and then there is the cost to consider.

Listen to what the man says, and save the money.

You are all wrong.

Personally I would stick with the standard set up and not change a thing.

Your car will run better, be worth more when it's time to sell and then there is the cost to consider.

to behonest des i brought the car so i can modify it. i have no intention of trying to sell the car anyway. i like to modify my cars to the way i want them dont do it as a money maker or to please other people it is purley for myself.

a boys toy as they say my little bit of fun with 2 kids and swmbo so i dont do the going to the pub etc etc dont smoke or drink so thats my play money.

people then say ( you cant use the power anyway max 70mph in this country) so why the hell are we all not driving around in cars that have been limited to 70mph wouldnt happen. i could probably bet my house that 100% of people on this forum have broken the imit a some point so that argument is none and void:thumbup:

its is good advise to people that have only limited money but to others its not a proble thanks for the advise:thumbup:

I have a low mileage K04 turbo and matchng manifold I could be tempted to part with.

how much do you want just for the turbo and manifold???

Edited 23 January, 200917 yr by westallc

This is useful info: The Mk1 Audi TT Enthusiast Resource: KKK Turbos - K03, K03s, K04, etc...

I'd just stick with the K03s, and get the most from it personally. Should be able to get 220bhp without going bankrupt!

According to that link, the K03s can't get any more than 250whp...... with nitrous!

Oh, and this tells you waht you need for the K04 upgrade:

Fourtitude Forums: Official K04-02x Information Thread

intersting looking at this there isn't a huge difference in power between the k03s and k04, but it does hold power a lot better.

Octavia vrs with k04

Edited 23 January, 200917 yr by martziniuk

Westallc,

I looked into this sort of thing last year and starting getting a few parts together ready for a slightly bigger turbo.

I wouldn't even think about this before you have done everything else to your i.e.Suspension,brakes,exhaust,FMIC etc....if you haven't done all this Forget It! till you have done.

I wouldn't go down the K04 route either and would opt for K03s hybraid of some sorts (TD) asit will probably cost less and will see aorund the same power if not more.

There is the other option of the JBS04 turbo, which I do believe is a hybrid k03s turbo. It'l bolt into the standard location & you won't need different oil lines.

Westallc,

I looked into this sort of thing last year and starting getting a few parts together ready for a slightly bigger turbo.

I wouldn't even think about this before you have done everything else to your i.e.Suspension,brakes,exhaust,FMIC etc....if you haven't done all this Forget It! till you have done.

I wouldn't go down the K04 route either and would opt for K03s hybraid of some sorts (TD) asit will probably cost less and will see aorund the same power if not more.

His car is fully sorted

to behonest des i brought the car so i can modify it. i have no intention of trying to sell the car anyway. i like to modify my cars to the way i want them dont do it as a money maker or to please other people it is purley for myself.

a boys toy as they say my little bit of fun with 2 kids and swmbo so i dont do the going to the pub etc etc dont smoke or drink so thats my play money.

people then say ( you cant use the power anyway max 70mph in this country) so why the hell are we all not driving around in cars that have been limited to 70mph wouldnt happen. i could probably bet my house that 100% of people on this forum have broken the imit a some point so that argument is none and void:thumbup:

its is good advise to people that have only limited money but to others its not a proble thanks for the advise:thumbup:

Actually you have just reminded me of something.

Westallc,

I looked into this sort of thing last year and starting getting a few parts together ready for a slightly bigger turbo.

I wouldn't even think about this before you have done everything else to your i.e.Suspension,brakes,exhaust,FMIC etc....if you haven't done all this Forget It! till you have done.

I wouldn't go down the K04 route either and would opt for K03s hybraid of some sorts (TD) asit will probably cost less and will see aorund the same power if not more.

yep all of the above already done:thumbup:

intersting looking at this there isn't a huge difference in power between the k03s and k04, but it does hold power a lot better.

Octavia vrs with k04

that is poor power for ak04-21 are you sure that isnt the k04-1??

This explains it all! Very useful info robbed from VWFixx.com:

QUOTE (Borg Warner)

Dear Sir,

thank you for your interest in our products.

First of all, we don't produce any turbo that we call K03S. But I hope I can

answer your questions with the following explanations.

All the following turbos have the same installation dimensions and

thermodynamical performance. The differences are only in the actuator that

opens the turbine bypass valve:

K03-011 (5303 988 0011) 150 hp, 65 N actuator

K03-026 180 hp, 85 N actuator

K03-035 180 hp, 85 N actuator

K03-044 150 hp, 65 N actuator

K03-045 156 hp (Ibiza Cupra), 85 N actuator with 2 ports

K03-049 150 hp (Sharan/Alhambra), 65 N actuator

The 180 hp versions have an actuator with a higher opening force due to the

higher exhaust gas pressure (which is a consequence of the higher boost

pressure). Otherwise the valve would be pushed open by the exhaust gas

pressure.

The following turbos are a further development (since 2000) and have an

improved and slightly larger compressor while using the same turbine (still

with the same installation dimensions):

K03-052 180 hp, 85 N actuator

K03-053 150 hp, 85 N actuator

K03-058 150 hp/180 hp, 85 N actuator

Consequentially, putting a 180 hp turbo on a 150 hp engine will not bring

about any change in performance, but putting on a K03-052/053/058 instead of

the older versions will bring a slight improvement in engine efficiency.

Additionally, with re-mapping the ECU you can achieve about 215 hp without

danger of overspeeding the turbo. With the older turbos, 195 hp is the

limit.

With the K04 that's also commonly used (5304 950 0001) the power output

should not be more than 220 hp. That means, changing a K03-052/053/058

against a K04 does not make a lot of sense.

I hope that these details answer your questions. If you need more info, one

of our service distributors will be glad to help you. Their addresses are on

our website TurboDriven.com - BorgWarner Turbo Systems.

Mit freundlichen Grüßen/Best regards,

BorgWarner Turbo Systems GmbH

Sales IDS - Technical Support

Christian Seibert