open o2 housing vs. real exhaust

[philipkrotch]

ok, im in school, which makes me poor, so when i go to th track or what not i run open o2 housing. well, th eother nite ui raced my friend with the same mods, except i have a bigger turbo, but hes got a full 3 inch exhaust, and i was running open o2. me with a 16g at the same boost (18) should have walked away from him, but he still pulled me about a half a car length until i hit 5th, then i annihaliated him. my question is does a full exhaust help more than having open o2? i kno for a turbo, the best exhaust is no exhaust, but does running open o2 overkill that statement? any help would be great. thanks

 

[johnk]

You'll accelerate a lot faster in lower gears if its just a 1/4 mile you shouldn't get out of 3rd. I'm not a know it all about exhausts but you do need some back pressure for your engine to run right.

 

[philipkrotch]

also, when i was runing stock boost, i couldnt tell that much of a difference from the stock exhaust, it helped a little of course but not a lot. i would only notice it when it started to creep.

 

[Eclipse90GSX]

just get an o2 dump

 

[philipkrotch]

just get an o2 dump

are you f-in serious......read my mods. plus, why would that have anything to do with wat i was talking about?

 

[TTA89]

me with a 16g at the same boost (18) should have walked away from him, but he still pulled me about a half a car length

I did not see any injectors in your mod list. But I know stock injectors arent enough to support a B16G to 18lbs. Might wanna log your car & see what its doing, might find out why its not as fast as it should be.

 

[johnk]

Ya if you buy a datalogger you can come join me in my crappy boat. I logged my car for a while and figured out I need new lifters (knock counts out of no where bad), a new TPS (throttle reads 3/4 or full when at low throttle randomly makes the car jerk) and maybe a CAS (my rpms go up in a jagged line jumping up and down 200 rpms after I get over 3k)

 

[philipkrotch]

i just wanna know if me not having any exhaust at all would make it not run as good..oh and BTW, my duty cycle is almost 100 percent.

 

[johnk]

That's bad you shouldn't exceed 85% did you atleast rewire your fuel pump or upgrade from the stock one? Your probably leaning the crap out of the engine and thats just good for burning holes in the pistons.

 

[philipkrotch]

dude ur retarded...read my mods. and my egts stick at 1450 so im not runnin that lean. and even if i rewired it , the DC wouldnt go down, they would go up if anything because the pump would be pumping more fuel.

 

[SpeedFreak03]

I think running open DP would be better, at the O2 housing might be a little too short. Anyway for your next mod, definetly get an SAFC and rewire the pump, and tune it on a wideband. I think that will help you out a lot. And johnk is right about the DC thing tho...running past 85-90% isn't the best thing to do. I wouldn't say your lean, but you are very borderline to over-running your injectors. So I'd get bigger injectors, SAFC, rewire the pump, and some wideband tuning. Start savin'!

 

[philipkrotch]

ya, i was plannin on gettin 650s and runnin rick as hell for now until i get enough $ for a maft setup. but ts not even at high boost when it doesnt feel right...even at stock boost it dont seem to pull much better w/ out the stock exhaust hooked up. o well, ill just wait for mu DP and see if it makes it run any better.

 

[mitsuclipsegsx]

where the best place to buy a o2 dump?

 

[philipkrotch]

i got mine from punishment racing...people bi*** about them, but i got mine for 150 shipped and it works great. no problems at all.

 

[FourGdrvr]

You'll accelerate a lot faster in lower gears if its just a 1/4 mile you shouldn't get out of 3rd. I'm not a know it all about exhausts but you do need some back pressure for your engine to run right.

You don't need back pressure. People who are running N/A street cars care about back pressure because of low torque but your car wants a faster spool to make power soon as possible. You don't worry about low end torque because you have none on DSM's. You get turbo lag.

If the car has an open o2 housing w/ a bigger turbo, but is running slower, try supplying more fuel (pump and injectors), and tune the car.

Don't you get boost creep?

 

[philipkrotch]

You don't need back pressure. People who are running N/A street cars care about back pressure because of low torque but your car wants a faster spool to make power soon as possible. You don't worry about low end torque because you have none on DSM's. You get turbo lag.

If the car has an open o2 housing w/ a bigger turbo, but is running slower, try supplying more fuel (pump and injectors), and tune the car.

Don't you get boost creep?

yes, i get slight boost creep up to around 20 but thats at like 6 grand and i shift around there neways. and for some reason EVERYONE tells me to get a pump..god damn, read my fuggin mods! i have a 190