I have a boosted b17a1 with a t3/t4 57 trim its street tuned and it has a stage 3 yonaka clutch, Cometic gasket, all stock internals minus buddy club cam gears. When I got it tuned it had a ram horn manifold with a full 2.5 straight pipe. I recently just installed a 3" downpipe and it's straight back till the S bend an stops. When I have a warm idle the air fuel goes off the aem uego gauge no reading when cruising its a 14:5-15:6. When in boost to about .45 bars do 6.6psi the afr is 11:3 but anything after that it goes to 10:0. What do you think is the problem?

Also the head is ticking but I got my tuner to do a valve adjustment and it ran fine no ticking but now it's ticking again. Any ideas thanks!!

 

off the reading high or low?
and the 3" downpipe and exhaust normally warrants a new tune...
it will cruise around that afr... part throttle low load requires very little fuel...

 

What do your an off the reading high and low? And ok that's fine I'll get a retune after I figure this ticking out.

 

at warm idle... does it swing high then go blank or swing low then go blank

 

On warm itll swing high to to blank to the lean side

 

sounds like you need to adjust the tune

 

Can I do that myself? Like am I able to adjust the a/f with a stock fpr

 

no.

 

that is all