Anybody dyno the cattman headers on a 5th gen yet? I’ve seen cattmans results, which are fairly impressive for a stock max with no VI, but im curious what that curve would look like on a 5th gen. I’m also curious if its worth getting if you already have a y-pipe. What do you think???

Has anyone considered rigging a resistor to prevent a CEL for cali-spec models. Would this even work, or are those sensors needed for the ecu timing, etc? I know you can put the o2s behind the main cat, but it would be nice if someone would make a resistor for our cars. Basically, under normal conditions the sensor reports some voltage. A resistor just fakes that voltage so the o2 sensors don’t need to be relocated. My friend has one on his wrx like this: http://www.ponyexpressperformance.co...liminator.html
Cattman mentioned the bogus signal solution but I haven’t seen anyone taking about it. Any thoughts?

 

I've only heard of one person with the VQ30 headers and he happened to be a '01(Cali spec).

We should hound him to dyno, but it's a little late now for a baseline. It still would be worthwhile to compare his dyno vs. others we have.

I'd be hesitant to do the resistor mod, since the ECU uses the REAR 02s in closed loop operation if the FRONT 02s go out of spec.. That would be my only concern, however relocating the 02s probably isn't much safer.

 

yeah, who was that anyway? (search is down.. ). it would be great if he would dyno, baseline or not.

whats the danger of the resistor and relocating the cats? what happens if the fronts go out of spec..you just go into limp mode? the ecu uses the fronts for a/f right?

Also, will the relocation work with a high-flow cat? I've sorta been wanting to put a cat converter back in cause my exhaust smells and if a cop looks under there and sees the test pipe im scewed. I'm just wondering if putting that cat back in is gonna cancel out most of the gains of getting rid of the other precat and better flowing heads. Are there any independent before/after dynos for a test pipe? I dont know if i believe custommaxima.com's 16 horsepower claim or whatever. What do you guys think? Im really torn about getting these headers.

 

how come the headers are not on Cattman's website???

 

The same thing I was saying.!!!!!!!!!!

 

I know right?

 

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Cattman is launching a new web site. He is evidentally not updating the old one.

 

yeah i guess cattman is waiting for their new site. Here is cattmans thread about the headers with pics, prices, and dynos: https://maxima.org/forums/3rd-generation-maxima-1989-1994/252261-different-rims-yay-nay.html

 

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Do I have to go to Charlotte for the install?

 

I have the facilites to install them.

 

yea i didnt dyno wich i guess was a bad move, even without relocating the o2's for about 3 weeks i got no sensor lights or anything car seemed to work fine. i havent used the drop resistor yet and now im scared too. i only use that as sort of a track thing. as far as performance with the old stillen ypipe going of a 20mph roll with my friends wrx made us dead even, i know pull by a car and
a half to 2 car lengths. ....pretty soon we will need "the mother of all cattman threads"

 

O so youre the one with the cattman headers, cool. Congrats on the purchase, sounds like you are enjoying them. Its not like your required to dyno or anything but if you could that would be really really really helpful to a lot of us. If you are interested in dynoing your car check out this link for a dynojet near you: http://dynojet.com/maps/autodynos/fl.htm Id call around and try to get a good price in your area.

So you didnt relocate the sensors and nothing happened? You just left them out? No ses light and the car worked fine huh..interesting.

We weren't talking about the drop resistor mod. We were talking about a resister that fakes the normal o2 sensor signal so you dont have to relocate the sensors. Problem is nobody makes one for us and im not sure if its a good idea to use that on the front o2s anyway.

 

the rear o2 sensors many job is to make sure that the precats work. so by placing them downstream of a cat they will read correctly. The RT hi-flow cat should not cause any issues with the headers and probably will add some necessary backpressure. There is a possibility with the "test" pipe in place that the exhaust isn't restrictive enough for the NA motor, and the exhaust fumes boag the motor. Dude, if you can afford um jump on it. Hopefully I'll join the header clan later next year.

 

edit:
http://forums.maxima.org/showthread.php?p=2499662