cut off exhaust with F.I.
#1
cut off exhaust with F.I.
Ok, I have a Blitz supercharger, with a typoon cold air intake, and 4-2-1 OBX headers, koyo radiator, perrin hoses, and a Greddy SPII axle back.
I'm thinking about getting a cut off valve that when i remove the cap i can redirect the flow, but putting the cap back on then can run normal.
http://www.lmperformance.com/2899/20.html
My question is how benifical is a cut off exhaust for this set up. One place I want to mount is befor the cat, or the second is after the cat. I know before the cat will produce more power. The only thing i'm worried about is the CEL. Some times the sensor tells the computer to go rich or lean and i don't know if this is one of them. I don't know how the sensors react to the computer. if it is just a light then it is ok i'll reset it.
I'm just looking for comments and ideas for this. please let me know
[/url]http://www.lmperformance.com/2899/20.html
I'm thinking about getting a cut off valve that when i remove the cap i can redirect the flow, but putting the cap back on then can run normal.
http://www.lmperformance.com/2899/20.html
My question is how benifical is a cut off exhaust for this set up. One place I want to mount is befor the cat, or the second is after the cat. I know before the cat will produce more power. The only thing i'm worried about is the CEL. Some times the sensor tells the computer to go rich or lean and i don't know if this is one of them. I don't know how the sensors react to the computer. if it is just a light then it is ok i'll reset it.
I'm just looking for comments and ideas for this. please let me know
[/url]http://www.lmperformance.com/2899/20.html
#3
you will lose some tq but it mite help out the top end and let the motor get that forced air out of there. Oh I have a question for you. You have the supercharger on a 06 xa right? How was the install? does everything work like the low med high switch? I am thinking about getting the blitz my self, just want some feed back from others with the same car as me. Oh and as for the cel coming on if its before the cat. Yes it prob will on every car that I know of with a second o2 sencer after the cat all that sencer does it make sure that cat is work....
#4
watching...personally i'd go after the cat, just in case. and i'm not sure how this works but if you cut off before the cat wouldn't you lose torque?
btw...where'd you get the obx header? far as i know that's the only 4-2-1 header available.
btw...where'd you get the obx header? far as i know that's the only 4-2-1 header available.
#6
they also have them that use a cable like our hood release.
here in Cali they are not street legal, even to install. just don't get caught with it here. had 2 of them on my ol'GTO, real nice for upper end and real load.
here in Cali they are not street legal, even to install. just don't get caught with it here. had 2 of them on my ol'GTO, real nice for upper end and real load.
#7
Do the cutout before the cat ( since the cat is very restrictive), it defeats most of the purpose for a cutout if it is after the cat. Also go with Duck Dodgers advice and get an Electric cutout, open and close at the push of a button. You will lose torque, but the high end will make up for it.
#8
Originally Posted by scion04xb
you will lose some tq but it mite help out the top end and let the motor get that forced air out of there. Oh I have a question for you. You have the supercharger on a 06 xa right? How was the install? does everything work like the low med high switch? I am thinking about getting the blitz my self, just want some feed back from others with the same car as me. Oh and as for the cel coming on if its before the cat. Yes it prob will on every car that I know of with a second o2 sencer after the cat all that sencer does it make sure that cat is work....
The supercharger itself wasn't that hard to put in except for the manifold bolts, it is a tight sqeeze. The switch is awsome, i have power when i want it and how i want it. I still get, on average, 34 mpg.
#9
Originally Posted by emokid158
watching...personally i'd go after the cat, just in case. and i'm not sure how this works but if you cut off before the cat wouldn't you lose torque?
btw...where'd you get the obx header? far as i know that's the only 4-2-1 header available.
btw...where'd you get the obx header? far as i know that's the only 4-2-1 header available.
#10
Originally Posted by ProshopXB
Do the cutout before the cat ( since the cat is very restrictive), it defeats most of the purpose for a cutout if it is after the cat. Also go with Duck Dodgers advice and get an Electric cutout, open and close at the push of a button. You will lose torque, but the high end will make up for it.
#11
okay, what do you think of this idea.
What if i put 2 of them, one before the cat, (but i move the sensor closer to the engine so maybe it won't effect the sensor, and one after the cat.)
The purpose behind that , depends on the situation. before the cat for total performance for on track racing, and after the cat for a little performance on the street(if i don't get caught)
As for the lose in low end torque, with the supercharger it already has alot of it expecially with the 4-2-1 header. So maybe it will make up with the high end power that i need.
It seems when drag racing, i have a whole lot of torque but when i get down half way of the track i just don't have very much.
What if i put 2 of them, one before the cat, (but i move the sensor closer to the engine so maybe it won't effect the sensor, and one after the cat.)
The purpose behind that , depends on the situation. before the cat for total performance for on track racing, and after the cat for a little performance on the street(if i don't get caught)
As for the lose in low end torque, with the supercharger it already has alot of it expecially with the 4-2-1 header. So maybe it will make up with the high end power that i need.
It seems when drag racing, i have a whole lot of torque but when i get down half way of the track i just don't have very much.
#12
Originally Posted by jesterizedcricketxa
Originally Posted by ProshopXB
Do the cutout before the cat ( since the cat is very restrictive), it defeats most of the purpose for a cutout if it is after the cat. Also go with Duck Dodgers advice and get an Electric cutout, open and close at the push of a button. You will lose torque, but the high end will make up for it.
#13
Originally Posted by ProshopXB
Originally Posted by jesterizedcricketxa
Originally Posted by ProshopXB
Do the cutout before the cat ( since the cat is very restrictive), it defeats most of the purpose for a cutout if it is after the cat. Also go with Duck Dodgers advice and get an Electric cutout, open and close at the push of a button. You will lose torque, but the high end will make up for it.
#14
Originally Posted by jesterizedcricketxa
okay, what do you think of this idea.
What if i put 2 of them, one before the cat, (but i move the sensor closer to the engine so maybe it won't effect the sensor, and one after the cat.)
The purpose behind that , depends on the situation. before the cat for total performance for on track racing, and after the cat for a little performance on the street(if i don't get caught)
As for the lose in low end torque, with the supercharger it already has alot of it expecially with the 4-2-1 header. So maybe it will make up with the high end power that i need.
It seems when drag racing, i have a whole lot of torque but when i get down half way of the track i just don't have very much.
What if i put 2 of them, one before the cat, (but i move the sensor closer to the engine so maybe it won't effect the sensor, and one after the cat.)
The purpose behind that , depends on the situation. before the cat for total performance for on track racing, and after the cat for a little performance on the street(if i don't get caught)
As for the lose in low end torque, with the supercharger it already has alot of it expecially with the 4-2-1 header. So maybe it will make up with the high end power that i need.
It seems when drag racing, i have a whole lot of torque but when i get down half way of the track i just don't have very much.
#15
thank you, i just about know what i'm going to do, put it before the cat and move the sensor more to the engine. i'll let everybody know how it comes out. if you have any comments or suggestions let me know please.
#16
The O2 sensors work on the heat produced, moving it closer to the engine it will show a different reading ( read out of spec).
having a cut out after the first O2 and before the second O2 the ECU will read a fault ( read CEL) again it will out of slec possibly throwing you into limp mode.
and believe it or not, our cats flow pretty well.
good luck, let us know how it works for you.
having a cut out after the first O2 and before the second O2 the ECU will read a fault ( read CEL) again it will out of slec possibly throwing you into limp mode.
and believe it or not, our cats flow pretty well.
good luck, let us know how it works for you.
#17
pardon my spelling errors and such as im a little toasted. but cats are the most restrictive part of the exhaust, if your going to put the cut out after the cat you may as well not get one. there are ways to bypass the 2nd o2 idk if for the xb but ive done it on an 04 wrx, and as stated many times, get an electronic one. you will be suprized at how little to no exhaust noise increase there will be. the top end power will be substancially differant. my old civic had an open downpipe (equivilant to cutout before cat) and when i put a cat, and full exhaust (apexi n1) to sell the car, there was a substancially noticable power decrease, and increased spool time, though this was with a turbo not blower.
best of luck!
best of luck!
#18
Originally Posted by xBtenchu
pardon my spelling errors and such as im a little toasted. but cats are the most restrictive part of the exhaust, if your going to put the cut out after the cat you may as well not get one. there are ways to bypass the 2nd o2 idk if for the xb but ive done it on an 04 wrx, and as stated many times, get an electronic one. you will be suprized at how little to no exhaust noise increase there will be. the top end power will be substancially differant. my old civic had an open downpipe (equivilant to cutout before cat) and when i put a cat, and full exhaust (apexi n1) to sell the car, there was a substancially noticable power decrease, and increased spool time, though this was with a turbo not blower.
best of luck!
best of luck!
for the xa, which way works to bypass the 2nd o2 sensor. I've heard of alot of ways but not one that somebody has tryied and worked. please let me know if you know of a way it will work on an xa. i had a 05 sti and i bypassed it using one way, but i also used that same way on an 04 sunfire and it didn't work. So some ways work on some cars and some don't, please let me know which way will work on an xa
#19
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