KO4 Turbo review

[Dscott]

A good search over on Vwvortex can provide you with the information you're looking for. However, i didnt see anything specificing hp rating,boost drop or volume of air; if this is what you're after. With this said, considering its size and core design it probably wouldn't be suited for a stg 1,stg 2 w/ standard turbo setup; personally i think it would be great for me, i am looking to upgrade to k04-2x size turbo; franken turbo may be the turbo i go with.

Part numbers are as follows:

Intercooler- 6LL145804
Bracket- 6LL1458808C
Bracket 6LL1458808B
Bolts to fit the brackets to the intercooler- N90280904

Also, a picture for your reference, http://i547.photobucket.com/albums/h...vrs/IMG082.jpg

Do you have any data on the intercooler - I like the way it's VW designed to sit in front of the factory radiator, but traditionally diesel intercoolers are designed for 25 - 30psi of boost, we are talking on a Polo 14 - 22 psi. - need to see boost logs to make sure it doesn't do what the forge ones do.

[Guy_H]

looks impressive, you just need the internal pressure drop figures & that woudl be a winner!

[Pommie]

I have just fitted the K04 to my Polo; it has BOV, PiperCross airfilter, 3in dump pipe, 4 bar fpr. The problem I have is it’s now blowing off all the pressure from the BOV at around 3000rpm so it’s not producing boost. At this time I only have the APR stage one software installed. If I get the new software for the K04 would this fix the problem or do you think it may be something different?

Any ideas would be appreciated.

[noone]

Look at Vagcom. Hard to know what the issue is, but sounds similar to limp mode.

You have more fuel and more boost, the ECU is not expecting either.

Tune should fix it, but depends on the issue.

[Guy_H]

a: remove the blow off valve.

b: run the car again

[noone]

Good point, is it a splitter or pure BOV? ECU expects the air to be routed back in post maf...

[Pommie]

The BOV was set to half recirculate and half atmospheric.

I tried removing it and reinstalled the stock DV and you can still hear air blowing and still no boost. Its got me stumped, I have been thinking I may off left a pipe off somewhere or done something silly but I can't find anything! The APR re-chip will cost me $750 but I'm reluctant to pay if it won't fix the problem. If I have to remove the K04 it will be money down the drain...

[Pommie]

I found the problem it was the top hose on the intercooler – I hadn’t done up the clamp (Stupid POM) so at least it’s fixed now, I haven’t put my boot into it yet as I will get it re-mapped first to make sure the fuelling is right… so I will give you my thoughts on Wednesday after it's done.


A big thanks to JMAC for his off forum help

[Guy_H]

Good stuff - they don't like any leaks. Look for overboost codes with a K04 as ultimately it will make more than the requested K03 boost & send you into limp as well.

[Pommie]

& send you into limp as well.

I heard some of those toxic paints can do that but I never knew tubo's could send you limp...
Hopefully the new APR K04 map will fix that.

[Pommie]

Just been out for the its run sonce the re-tune, the difference is amazing - I'm not sure if the tubo I fited it the same spec as the stock K04 as it was a hybread and I had to make a new inlet manifold - now 50mm. The road was slightly damp but in third gear the car easy breaks traction. Can't wait till the road drys out so I can have a real play.
One thing I did notice was the torque/boost now comes in about 500rpm later but keeps boost their after.

[Guy_H]

Sounds about right (spool up) - keep that BOV set to recirc until everything is bedded in.

[Pommie]

I got the car re-chipped and with the new bigger turbo it really fly's. I should of got it dynoed before and after but didn't - still I reckon it would have a 40 - 50hp gain which is not bad for a $400 turbo and re-chip $750. Happy day's...

[vwthunder]

I got the car re-chipped and with the new bigger turbo it really fly's. I should of got it dynoed before and after but didn't - still I reckon it would have a 40 - 50hp gain which is not bad for a $400 turbo and re-chip $750. Happy day's...

Where did you get the turbo ??

Thanks