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Model specific boards => Golf mk4 => Topic started by: rickos on 06 July 2009, 20:05

Title: turbo lagging 1.8t
Post by: rickos on 06 July 2009, 20:05

hi have a bad problem with my mk 4 golf 1.8t. it drives fine up until you get to 3000 4000 revs and the turbo kicks in and you get a bad lag. there is no fault codes when i had it put on the computer and i have changed the pressure boost solenoid valve (n75) and there is no change. is there any one who has experienced this problem or any mk4 turbo experts?

Title: Re: turbo lagging 1.8t
Post by: jamie16v on 06 July 2009, 20:06

thats the 1.8t for you i guess... get a remap :smiley:

Title: Re: turbo lagging 1.8t
Post by: linz on 06 July 2009, 20:08

all turbo cars are gonna have lag...

Title: Re: turbo lagging 1.8t
Post by: topher on 06 July 2009, 20:08

Sounds like a boost leak.. could be a split pipe that's ballooning under full boost. Check all the boost hoses, particularly around the intercooler connections.

Title: Re: turbo lagging 1.8t
Post by: Rhyso on 06 July 2009, 20:10

Quote from: linz on 06 July 2009, 20:08

all turbo cars are gonna have lag...

yebut it should lag and then go  :wink: not spool, power, lag, power

Quote from: topher on 06 July 2009, 20:08

Sounds like a boost leak.. could be a split pipe that's ballooning under full boost. Check all the boost hoses, particularly around the intercooler connections.

check around the pancake pipe in the drivers wheel arch - a few peeps have had a leak there

Title: Re: turbo lagging 1.8t
Post by: topher on 06 July 2009, 20:12

don't listen to linz she blew her car up :tongue: :grin:

Title: Re: turbo lagging 1.8t
Post by: rickos on 06 July 2009, 20:29

o.k thanks ill have a look at my pipes the weekend. also want to make it quicker and i dont want to re-map it yet. car is standard other than a dumpvave.  im thinking exhaust and filter?

Title: Re: turbo lagging 1.8t
Post by: topher on 06 July 2009, 20:33

I reckon 3-4bhp gain with a decent backbox, make that more like 12-15bhp if you do the downpipe and cat aswell. Filter on it's own is 1-2bhp tops... all that stuff only really makes a difference when remapped.

Title: Re: turbo lagging 1.8t
Post by: rickos on 06 July 2009, 20:44

ok. what make's would you recomend? also been looking into getting a front mount intercooler. any suggestions on where and what make recommend getting? thanks..

Title: Re: turbo lagging 1.8t
Post by: topher on 06 July 2009, 20:53

ahh thats all the free info you get for today :tongue:

have a look in the maintenance and info section, and the sticky topics.. then have a play with the search function, im sure you'll find lots of answers!

Title: Re: turbo lagging 1.8t
Post by: LazyLunatic on 06 July 2009, 20:54

boost leak i would have thought, i am probably wrong, but doesnt the k03 turbo boost at like 2000-2500?? with very little lag??

as for fmic, sierra cosworth or a tdi cooler work well, especially sprinter van coolers. not sure what fits best with the mk4.

:)

Title: Re: turbo lagging 1.8t
Post by: james2 on 07 July 2009, 13:40

Mine used to lag bad until i found out my diverter valve wasnt opening and it used to make a wastgate catter :drool: