mk4 golf 1.8 k04 forged engine

[rageraver]

hi guys i just picked up  a golf mk 4 with a k04 turbo huge intercooler and full system, the boost dosent come in till 4k and then it pulls like a train, is this normal, when i asked the guy said i had it an econmy map done so it dosent boost till late, he has given me a mbc is there anything i can do to get it boosting early, i thought is shud start around 2.5k can i fit the mbc and remove the n75 valve ( thats if it isnt already removed and just running actuator.

[JimBR]

NO! Bin the MBC. A K04 should be boosting before 4k I think.

Check all boost and PCV hoses then get it to R-Tech for a proper map. Do not remove the N75. You can't just turn the boost up without changing the fuelling.

[Toby]

Mine comes on boost around 2/3k

[dom]

NO! Bin the MBC. A K04 should be boosting before 4k I think.

Check all boost and PCV hoses then get it to R-Tech for a proper map. Do not remove the N75. You can't just turn the boost up without changing the fuelling.

This. A MBC is asking for trouble.

Sounds to me like a better map is needed

[Wazzzer]

Manual boost controllers can be fitted with the N75 but must be left alone once set by a pro

[scarr89]

Is there just a sh!t load of lag from a 'huge intercooler'? How badly to these things lag?

[scarr89]

How much power you got under the hood? Any RR read out? You and Toby could become best of friends...Ko4 friends 

[Ashmond]

Mine comes on boost around 2/3k

Same, like late 2's, early 3's

[rockmonkey69]

varies from wheel to wheel and clipping the turbine wheel 7 degrees slows the spool by ~500rpm but helps with surging.

Just take it to a competent tuning company and have it checked, odds are if your hybrid has a (5304-120-5018) turbine wheel clipped in a k04-022/23 turbine housing 4000rpm full boost is right. You don't want to make an uninformed decision and remove the n75 to stick a mbc on just because you think there might be something amiss...

[Wazzzer]

varies from wheel to wheel and clipping the turbine wheel 7 degrees slows the spool by ~500rpm but helps with surging.

Just take it to a competent tuning company and have it checked, odds are if your hybrid has a (5304-120-5018) turbine wheel clipped in a k04-022/23 turbine housing 4000rpm full boost is right. You don't want to make an uninformed decision and remove the n75 to stick a mbc on just because you think there might be something amiss...

and then worst case... BOOM