ok so back up one step.

what are the causes of fuel (burnt not wet, like at a racetrack) smell in the cabin?

 

did you put a new doughnut gasket on your o2 housing to downpipe connection before reinstlaling?

 

yes - well it wasn't new, it was the one that came with the downpipe originally

 

well if its a leak, you should see some black sut around where the downpipe connects to the o2 housing.

wait, was this a stock downpipe you just welded a bung into, or after market??

 

yeah ive been looking for soot

aftermarket came prewelded bung (SS304 3" down pipe)

 

isn't the stock cat a 2.50 "..maybe its leakin form the flange perhaps.

 

mmm - i guess the only real way to find it will be via soot marks.

i will report back tommorow night!

guess I will be running super rich in the mean time

 

super rich ftmfw!!!......super broke ftmfl!!!

 

Just as a FYI when i had my header ported i didn't tighten the manifold down and had a small leak. After taking it back off breaking two bolts and retaping the turbo housing to for new bolts I rid myself of the "80's car smell"

Good luck to you hope you nail down that AFR problem too, a boost leak test actually is what found my leaky MAF pipe :P

 

You don't have a breather filter on the valve cover vent, do you?

 

oil catch can?

yes but the hose is zip tied...

ill dbl check for oil leaks around that thou, just incase good pt!

 

u may also want to check the area surrounding the injectors for markings there may be a slight fuel leak during wot.

 

This would be more of a raw fuel smell but he's smelling burnt exhaust gases.


This was gonna be my question. Think of all the places these gases can be in the engine compartment. They are in the crankcase, under the valve cover, going back into the intake pipe (unless your catch can vents to the atmosphere...then thats obviously you're likely source), and then through each component of the exhaust system (manifold,turbo,O2 Housing and downpipe. Also, look completely under the cabin and trunk to be sure the rubber "flood drain grommets" aren't missing. Even if you have a hole in the floor in the rear, it can easily travel up to the front of the cabin. Especially when you go from high G's to reversed G's during a hard stop I'd imagine.

 

I dont think its between TP and DP. I bet its on his DP, where you connect dp with O2, IF everything was fine and afterinstalling DP he gets a bad gas smell thats the only spot i can think of. No its not fuel, it is exhaust fumes.

another place would be exhaust manifold.

 

ok just a quick update - after running super rich and boosting everywhere I opened the bonnet to find the front of the valve cover covered in soot!

so its definatley the o2housing -> downpipe ie that big ring donut!

anyways I redid it again, this time using a jack to lift up the downpipe but i think its still there

anyways I raced today so ill look tommorow