gutted/no cats
03-23-02, 06:42 PM
#1
Lava Surfer
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gutted/no cats
ok well, my knowledge comes from piston engines so i have some questions for the rx gods in here.
does ripping off the cat have any neg effects on a rotary? i know a piston engine uses the back pressure, and your vavles can wear out sooner with less of it (i know there are no valves like that in rotaries tho in case you thought i had smoked myself retarded). also will no cats cause you to sacrifice low end torque for high end hp? cuz i want the low end torque...so does that happen with rotaries?
does ripping off the cat have any neg effects on a rotary? i know a piston engine uses the back pressure, and your vavles can wear out sooner with less of it (i know there are no valves like that in rotaries tho in case you thought i had smoked myself retarded). also will no cats cause you to sacrifice low end torque for high end hp? cuz i want the low end torque...so does that happen with rotaries?
03-23-02, 06:52 PM
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WTB S5 N/A FC
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Yes and no. If you have a 88 or earlier, you need the backpressure to open the 5th and 6th port actuators. Also, no backpressure = less torque. I have gutted cats, and I am about to bolt up a very high flow exhaust, it is not too bad a cut, but it is very noticible. If you want torque, or you have a 88 or earlier, leave on the cats.
03-26-02, 07:14 PM
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its an 88 NA, sorry i shoulda posted that earlier 
so back pressure good for low end torque because of the 5th and 6th ports?
so should i just get a decent hi flow to replace the cloggy stock one?
so back pressure good for low end torque because of the 5th and 6th ports?
so should i just get a decent hi flow to replace the cloggy stock one?
03-26-02, 10:04 PM
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Well I have an 86 N/A with a Straight pipe from the Exhaust manifold all the way back to an Apex-i Dunk Muffler...I have 0 cats, I have my 5th and 6th ports open..I lost a little bit of Torque when I wired them open..But gained a great deal of top-end power...I will be speed testing it tommorow to see if I can get over 120 mph...That is as fast as I could get it without the 5th and 6th ports opening...I will let you know how it goes...
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03-26-02, 11:35 PM
#9
Originally posted by rico05
Yes and no. If you have a 88 or earlier, you need the backpressure to open the 5th and 6th port actuators. Also, no backpressure = less torque. I have gutted cats, and I am about to bolt up a very high flow exhaust, it is not too bad a cut, but it is very noticible. If you want torque, or you have a 88 or earlier, leave on the cats.
Yes and no. If you have a 88 or earlier, you need the backpressure to open the 5th and 6th port actuators. Also, no backpressure = less torque. I have gutted cats, and I am about to bolt up a very high flow exhaust, it is not too bad a cut, but it is very noticible. If you want torque, or you have a 88 or earlier, leave on the cats.
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