Spec - 99 Sc300 with GTE and BL Auto 3800 Stall, BL67DBB

Ever since I had the stock twins, the boost was very unpredicable. When it was stock I thought my vacuum routing was bad so I replaced the turbos with single.

Still the same thing, the boost some days hit 10 lbs, than 15lbs, (where I had it set with EVC - checked all the vacuum lines and replaced them all just incase pin holes) but still some days it will hit 18 lbs than 10 lbs.

Could it be due to my stock(SC) rear end??

I have checked and tighted all the piping. Any other ideas? Thanks in advance.

 

Have your intercooler pressurized for leaks. Check your intake manifold, a bad gasket can cause boost loss.

 

Thank you for the input, i was able to re-route the vacuum lines and just got it running correctly. Thank you.