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Old 02-03-2007, 12:21 PM   #1
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Default Thoughts on mods

Hi again, been gone for a while, life gets in the way.

I'm considering making a few changes to my 97 bonny this year and was wondering what I will get from it.

First, I want to replace my exaust with a free flow cat and remove the resinator. I know this is mostly a estimate but about how many HP will I get doing this if I stay with a 2.5 exaust, and if I went with a 3 inch exaust?

Next I want to upgrade my SC pully, I know stock I should only go as small as a 3.5 but if I make the changes to the exaust first, can I go smaller? If so, at what point should I go? and about how may HP would I be looking at?

Other upgrades are a new PCM, cooler plugs, and perhaps tires.

All I've done so far is a CIA, 180 therm, and gatorback SC belt. Any thoughts on what I have planned?
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Old 02-03-2007, 12:31 PM   #2
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Don't remove your resonator. It'* not a restriction to you (not for a long time) and I should point out that my 93 never had one. I ADDED one to clean up the sound. It wasn't pretty after upgrading my cat and muffler. The high-flow cat may gain you 5-10hp. 5hp if your current cat isn't clogged, 10hp if it'* old and clogged.

With few mods, a 3" exhaust will kill some low-end torque. There are only maybe 5 or 6 cars on this forum that flow enough to support a 3" exhaust.

Get a scantool or know of one nearby that you can borrow before going any smaller than a 3.5" pulley. You MUST scan for KR before and after, and again as the weather starts heating up. Zero KR now can mean 5-10 degrees in warmer weather.

A SC pulley isn't a magic mod. You may have to do other work to be able to run it. And you need to monitor it fairly frequently. An Aeroforce scangauge would be a good alternative to a scantool.
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Old 02-03-2007, 12:44 PM   #3
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Ok, so staying with a 2.5 exaust is the best bet, and leaving the resinator on is not a problem.

I have Proscan for my laptop, but it did not have KR, is there something I can check and figure it out? I'll have to see if there is an upgrade at this time.
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Old 02-03-2007, 12:50 PM   #4
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KR is a specific item. No combination of other data will tell you if you have it.
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Old 02-03-2007, 12:52 PM   #5
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That'* what I was afraid of. I see there is a new version of my software, I'm downloading it now.
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Old 02-03-2007, 02:09 PM   #6
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Ok, got the upgrade an dwill go out to connect to the car. Only problem is it'* single digits here, damn it'* cold. Only a high of 5 today. Oh ya, thought you all might get a kick out of my car from the other week. Drove home from chicago and hit a snow storm in Milwaukee, had to pull over and this is what I found.

Was lucky to hit 40mph.
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Old 02-03-2007, 02:44 PM   #7
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Allright, that was cold. I saw nothing that said knock retard. Could this be under a different name, such as 1st cylinder timing? If so, I have that. The only thing I learnd is a touch pad dosn't work with gloves, and it also dosn't work real well when your fingers are frozen.
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Old 02-03-2007, 03:02 PM   #8
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KR
Knock Retard
Timing Retard

(not timing advance).

If you don't have one of those 3, you don't have it. Not all scantools do.
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Old 02-03-2007, 03:05 PM   #9
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Then it'* looking like I don't. I'll have to see what I can do about that.

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Old 02-10-2007, 12:39 PM   #10
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Do you feel it would be a good idea to use the money I planned to use on the new exhaust to get ported manifolds? This should help open up the exhaust and help reduce the KR. From what I have seen, the benifite per cost is better with the manifolds. Then I would be able to look at a smaller pully after I change out the PCM, or would I be better of changing the pully first, or do both at the same time?
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