Boost leak...help required...!

[prel2000]

Any ideas what could be causing a boost leak in my A4 1.8T (2002). The car just deosnt seem to pull fast enough when foot is down in about 4000-5000 revs.

I drove a mates 1.8T the other day and there seemed to be constant power at that rev range and he's isnt remapped either.

Thanks to all in advance...:icon_thumright:

 

[MJCAUDI]

I had this and found my Diaphragm in the diverter valve was split. Replaced with a forge Closed Loop Diverter Valve with higher spring pressure (because of remap) and was much better.
Good luck

 

[prel2000]

Thanks for the reply.....
My car has also been remapped and I am also using the forge diverter valve. When you say higher spring pressure, is this a modification to the valve itself or is it how the valve comes as standard? as mine was just fitted as standard out of the box.

 

[MJCAUDI]

Heres a link to the spring kit , I have APR map and am using the yellow spring (15-23 PSI).

Heres the link:

http://www.forgemotorsport.co.uk/content.asp?inc=product&cat=0007&product=FMDVTUN

also the Valve Diaphragm in the valve can also split, heres the link for the replacement:

http://www.forgemotorsport.co.uk/content.asp?inc=product&cat=0007&product=FMND109


check these are the right ones for your valve.

Let us all know the cause when you find it, good luck!

 

[prel2000]

Thanks again for the reply MJC.

How did you determine which spring to go for? Mine has a star performance remap, i was quoted gain figures from 150bhp to 200 - 205 bhp. Which colour spring do you think I should go for?

Cheers:thumbsup:

 

[MJCAUDI]

I would check the Diaphragm is not split first , then replace with the lowest rated spring ( Green one ) and see how it feels. If you feel its still lagging a little put the yellow one in. You just have to experiment a little, you dont won't the spring to be so strong so it does not release the pressure either.

Hope this helps
Cheers