Cats back on along with stock intake, easier to redline?
08-25-02, 03:12 PM
#1
I Post In The Nude
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Cats back on along with stock intake, easier to redline?
Yeah ok so I put my cats back on and my stock intake back on. Before i had an aftermarket intake cone and a bonez midpipe on. Well after i put all the stock stuff back on it was so easy to get my car to redline. I would freely go to 8.5k, why is this?
08-25-02, 03:21 PM
#3
pei > caek
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You have more back pressure. Having a free flow system will apparently drop torque #'s (the actual drop is different for every car).. So with more torque you can accelerate faster.
Btw, I dont know how true this would be for your car... However thats how it was with my friends T/A. With a cutout he had a lot of top end and lost a little on the bottom. With it capped it felt way stronger down low.
Btw, I dont know how true this would be for your car... However thats how it was with my friends T/A. With a cutout he had a lot of top end and lost a little on the bottom. With it capped it felt way stronger down low.
08-25-02, 03:29 PM
#4
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well see thats the thing, i know its backpressure but it feels a lot stronger in the higher rang with the cats on. with the midpipe on it felt stronger in the midrange but really tappered off around 7800.
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08-26-02, 02:19 PM
#10
RX-7 Bad Ass
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Originally posted by kleach18
Nope he's got a s5. The aux ports are opened using a vaccum not the exhaust.
kleach
Nope he's got a s5. The aux ports are opened using a vaccum not the exhaust.
kleach
My guess is there's something related to the air pump - either removed or disabled. First time I ditched the cats on an '89-91 non-turbo I pulled off the air pump, and the car was quite a bit slower - I didn't know about it then
. NA stuff is weird .Dale
08-26-02, 02:46 PM
#11
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You could be running lean with the int / ex opened up. I'd bet you'd find a difference if you were to check that with a guage, or even a volt meter on the O2 sens.
San.
San.
08-26-02, 03:22 PM
#12
RX-7 Bad Ass
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NA's actually tend to run rich with the whole system opened up - the AFM can easily compensate for the increase in volumetric efficiency.
With the 6 ports and VDI not working, it's a snail to hit redline.
Dale
With the 6 ports and VDI not working, it's a snail to hit redline.
Dale
08-26-02, 05:15 PM
#13
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I have an a/f gauge in the car and it showed i was running rich the whole time, i also still have the airpump on and working. Maybe the intake i had on was really restrictive or something. I wasnt a high quality filter, it was like one of those ones you can buy at autozone thats universal. I dunno maybe not though
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