Okay so I finished the FMIC. While cruising i noticed that the turbo boosted like 10 psi but after a few seconds it dropped to 8. What's up with that? It needs a rebuild soon. But before the FMIC it was making like 10-15 psi.

Gotta leak somewhere?

lee...gotta means got to....got a means have a



get it right



and yea it sounds like it could be a leak somewhere but thats weird to go up and then down



btw ---- you have any news on that short shifter i asked about a whileeee ago

Up and Down indicates a boost leak.

Okay, I shall inspect the tubing this evening.



Thanks

you will notice pressure drop from your FMIC in other words. turbo puts out 10 psi but when it gets to the manifold you are down to 6-8 psi..... it doesn't matter on large turbos but the top mount was there for a reason no pressure drop

Yeah, the stock turbo can't fill up a larger IC very well.

yah if it had a boost leak and the stock ecu it woudnt idle either, i like voskos answer



mike

That makes more sense. The air is cooler so it has less pressure correct?

actually colder air is denser so it would have more pressure

the stock turbo isn't efficient at anything above 11 psi i find.



even with top mount, the boost would spike to 11 psi and it would kinda hold at 11 till around 5000 rpm when it starts to trail off and i end up at around 9 to 9.5 psi at redline.

judge ito said if you crank it past 10 psi they crap out very quickly..... he used to go thru quite a few when his rx truck had stock turbo on it lol

I worked on an eclipse with a big greddy front moutn and stock turbo. Same problem, coun't hold boost, especially at high rpm.The turbo was too small to make up for the pressure drop.

my friend blew up 2 stock turbos, trying to run 15psi

not true, some leaks only open up above certain PSI, weirdness of turbo cars

i blew one running 7psi. it sprayed my hood with oil whenever i got on boost. that was sweet. check the gas fill the oil https://www.nopistons.com/forums/pub...1047683785.gif

todd managed to get all 6 quarts from the pan out if the turbo in about 100yards

i only run 10+ psi when i need to show a FD guy what a S5 TII can do

punish a scale?

heh.... https://www.nopistons.com/forums/pub...R#>/tongue.png



I've been running .8bar on my turbo II for the last year or so. Put down 232 rwhp@11 pounds, and the turbo is still in pretty good condition.

that was a cheap shot!