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cat delete?

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Online JollyZuk

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Re: cat delete?
« Reply #4 on: July 11, 2018, 09:55:01 PM »
With conservative timing, nope. I have yet to hear sit ping, and that is driving it around town and on the highway in 100+ heat.  Now my buddy said he originally ran more timing in both motors he built this way.  With more timing it did ping, and he said both rigs blew head gaskets like clockwork every 5k miles.  Now he never ran premium fuel.  He said they did have more power and response with more timing, but the head gasket repairs were getting old.  I have been tempted to fuel up with premium and bump the timing up just to see how much better it would do. 
As I said before, no experience driving a stock 16 valve, but with 235 tires, pulling a small trailer it will still run and hold 70 in 5th gear.  And no trailer, I can air it out and run 80+ all day long.

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Offline nsrrider

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Re: cat delete?
« Reply #3 on: July 11, 2018, 07:18:35 PM »
The theory on exhaust is less back pressure is more HP up high, less torque down low...Something you might try is shaving the head to increase compression.  Now, my experience is limited to driving the vehicle with the increased compression.  I have not driven one that is stock, so I can't say for sure how much of an improvement you would receive.  But I can tell you that shaving .030" off the head is doable, and it lasts with the timing set properly.  The previous owner of my 'Kick had overhauled the motor and had the head shaved.  He has done this on 2 'Kicks, and had no longevity issues.  He said the performance increase was significant.  Is yours a 16 valve, or 8 valve?

thanks for the input.....mine is the 16V......does you hi comp set up require premium fuel?

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Online JollyZuk

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Re: cat delete?
« Reply #2 on: July 09, 2018, 06:19:44 AM »
The theory on exhaust is less back pressure is more HP up high, less torque down low...Something you might try is shaving the head to increase compression.  Now, my experience is limited to driving the vehicle with the increased compression.  I have not driven one that is stock, so I can't say for sure how much of an improvement you would receive.  But I can tell you that shaving .030" off the head is doable, and it lasts with the timing set properly.  The previous owner of my 'Kick had overhauled the motor and had the head shaved.  He has done this on 2 'Kicks, and had no longevity issues.  He said the performance increase was significant.  Is yours a 16 valve, or 8 valve?

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Offline nsrrider

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cat delete?
« Reply #1 on: July 07, 2018, 07:27:48 AM »
hi guys, would there be any HP benefit to deleting the cat converter? No DEQ where I live. Downsides? Did a search but did not find anything definitive. Just got this 95 tracker and like everyone else would like a bit more HP out of it. It came with headers, stock intake and exhaust. Stock wheel sizes/ AT. thanks!