N75J Valve Info please

KennyPOLO_Gti · Post by **KennyPOLO_Gti** » Mon Oct 13, 2008 8:58 am

Ordering my TIP today, so thinkin of gettin a N75J valve. Been readin thro other forums and sites bout this valve and it seems very mixed opinions. Seems to got overboost on a lot of cars and do more damage than good! What do u think???

Jeff GTi · Post by **Jeff GTi** » Mon Oct 13, 2008 9:19 am

mine works fine with the mods i have, better than the original one anyway

i found a more hardcore feel to acceleration and its smoother how it delivers its boost

KennyPOLO_Gti · Post by **KennyPOLO_Gti** » Mon Oct 13, 2008 9:48 am

Well just order maself one

See how it goes with the TIP, hopefully it doesnt thro anythin into limpmode now ave got ma intake and exhaust flows alot better

more-bhp · Post by **more-bhp** » Mon Oct 13, 2008 11:59 am

I did a golf 1.8t 150 the other day that had the J valve on and boost was perfect... no overboost.. just nice and smooth...

Try and see... its no problem to sell again on ebay if it dont work

Jeff GTi · Post by **Jeff GTi** » Mon Oct 13, 2008 7:23 pm

i have all the mods you have and more kenny, and im having no issues, id be baffled if you did mate

oliverpologti · Post by **oliverpologti** » Mon Oct 13, 2008 7:59 pm

what exactly does the j valve do lol and anyone got any pics of what part it actually is under the bonet
god i sound dumb lol

KennyPOLO_Gti · Post by **KennyPOLO_Gti** » Mon Oct 13, 2008 8:12 pm

Yeah am gettin one Jeff, ordered ma TIP from Awesome too

So will be fitting them this week hopefully

Its a more aggresive boost valve and smoother drive. Replaces the standard N75 valve. Its on ur TIP just after the DV. A was never too keen to fit one before with standard TIP and downpipe as it is known to thro car into limp mode so wasnt prepared to risk it, but now ave got intake and exhaust sorted am gonna get one

Following the ECU remapping of some 1.8 Turbo cars there can be an amount of surging as the car is prevented from over boosting. By replacing your standard N75 valve with the 'J' version this will overcome this issue and give a far smoother drive.

oliverpologti · Post by **oliverpologti** » Mon Oct 13, 2008 8:19 pm

so it is not advisable to fit one before getting the tip?

KennyPOLO_Gti · Post by **KennyPOLO_Gti** » Mon Oct 13, 2008 9:26 pm

That was just my choice mate as i heard it can overboost ur car and put it into limp mode so wanted to get intake and exhausted sorted first. Have a google about it mate, lots of info on the net bout them

whitegtipolo · Post by **whitegtipolo** » Mon Oct 13, 2008 10:27 pm

all you can do is try it, i tried and it failed it all depends what map software you have etc to how it will react! mine ran mint when it worked but without warnin would limp??!!

oliverpologti · Post by **oliverpologti** » Tue Oct 14, 2008 10:28 am

if it goes into limp how do you get it back normal would i have to take it to dealers or just do it on its own

i have more bhp stage 1 stainless cone and forge recerc more bits on its way

more-bhp · Post by **more-bhp** » Wed Oct 15, 2008 5:04 pm

oliver - there is no reason for you to fit a J valve.

dont you already have silky smooth boost ???

J valve will work fine with your version... its ok with less aggressive software you have.

try cranking the wastegate.. its free and will make more boost... but only crank it the smallest amount...

If you have aggressive boost and J valve there is a possibility at some time you will make more than the max boost limit.. the map sensor is setup to meaure 2540 mbar (ie 1.55 bar boost).. the aggressive file can make 1.4 bar with F valve.. put the J valve in and its possible sometimes to go past the limit... hence limp at 0.3 bar (slow)

Limp will clear on its own.... can take a few minutes.. or a few turn off/ons of ignition... but error will stay recorded.

Ecu just likes to protect the engine... which is no bad thing..

j

oliverpologti · Post by **oliverpologti** » Thu Oct 16, 2008 5:36 pm

yup j the map is silky smooth just im used to quite a bit of power with the copper s works so i get used to the power so quickly so im looking for more power now whats needed?