RT cat owners: are you running lean?
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Joined: Oct 2003
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From: Canada
I'm still confused as why where and how the RT cat cause a lean condition.. why are they so significant to the lean condition? Do other highflow cats create a lean condition?.. nismo, crawford, etc... why?
Last edited by Tex Willer; Jan 4, 2004 at 01:24 PM.
I'm also confused regarding how RT cats could cause a lean condition. On a 4 cycle engine, I would expect that changes to the TB, ECU, plenum, injectors, cams, timing, aspiration etc could effect AF ratios.... but I fail to understand how changes to the exhaust cycle could change the AF ratio.
Is there enough feedback from people with only RT cats, or RT cats in combination with other exhaust-only mods ?
Is there enough feedback from people with only RT cats, or RT cats in combination with other exhaust-only mods ?
....for your health
Joined: Mar 2003
Posts: 5,592
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From: Raider Nation
Originally posted by 12SecZ
Or is it PROM and EPROM when flashing? Doesn't matter I guess my question is does changes in Diagnostic Mode effect the TS reflash?
Or is it PROM and EPROM when flashing? Doesn't matter I guess my question is does changes in Diagnostic Mode effect the TS reflash?
Originally posted by Tex Willer
I'm still confused as why where and how the RT cat cause a lean condition.. why are they so significant to the lean condition? Do other highflow cats create a lean condition?.. nismo, crawford, etc... why?
I'm still confused as why where and how the RT cat cause a lean condition.. why are they so significant to the lean condition? Do other highflow cats create a lean condition?.. nismo, crawford, etc... why?
The initial theory is that the o2 sensor is sitting closer to the catalyst and the o2 sensor (because of the increased heat) thinks the car is running rich and has the ECU try to compensate and lean out the mixture. (So I guess this could happen with stock ECU as well).
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Joined: Jan 2003
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From: Coppell, Texas
So, it is safe to run the RT cats with the stock ecu? I'm planning to get one soon, but I do not want to making the car running too lean because the cats. And has anyone with the engine lights come on due to the RT cats?
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Joined: Aug 2003
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From: Stevenson Ranch, CA
I have the RT Cats with a stock ECU. I really don't know if I am running lean or not (just got the cats last month). I have had no CEL issues and no pinging. I will probably get a TS reflash in the next 30-45 days.
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Joined: Nov 2003
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From: LA
How's the sound ? Anyways, I seriously doubt that running the RT Cats with the stock ECU is gonna run you lean. Seems like people only with a previous TS flash are having issues. I'am also getting the RT cats installed tommorow at www.performancenissanparts.com on my g35 coupe with no other real mods besides a Z-Tube and Blitz filter. I'll report back on any findings.
Originally posted by Wedge
I have the RT Cats with a stock ECU. I really don't know if I am running lean or not (just got the cats last month). I have had no CEL issues and no pinging. I will probably get a TS reflash in the next 30-45 days.
I have the RT Cats with a stock ECU. I really don't know if I am running lean or not (just got the cats last month). I have had no CEL issues and no pinging. I will probably get a TS reflash in the next 30-45 days.
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From: NOR - CAL
Thanks StrictlyZ,
The ECU learns the same whether flashed or reflashed in closed loop mode it just learns slower.
Try it, I have Borla Headers and Borla TD and bought RT Cats and it brought my system to life and added TORQWUE! then Chicken Little screamed "the sky is falling." It wasn't I am "reflashed" and do not have any "problems." You will never know by asking is my point you have to try it. I would talk to Performance Nissan they have two N/A Z's and seem to have a firm grasp on these Cats and the ECU (my opinion, take it FWIW)
The ECU learns the same whether flashed or reflashed in closed loop mode it just learns slower.
Try it, I have Borla Headers and Borla TD and bought RT Cats and it brought my system to life and added TORQWUE! then Chicken Little screamed "the sky is falling." It wasn't I am "reflashed" and do not have any "problems." You will never know by asking is my point you have to try it. I would talk to Performance Nissan they have two N/A Z's and seem to have a firm grasp on these Cats and the ECU (my opinion, take it FWIW)
....for your health
Joined: Mar 2003
Posts: 5,592
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From: Raider Nation
A few of you guys that is installing RT cats with stock ECU need to get your a/f so we can see if stock ECU causes lean condition or not. Like skrofa14 said:
"Seems like people only with a previous TS flash are having issues"
"Seems like people only with a previous TS flash are having issues"
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From: NOR - CAL
What happened to the one guy who's only mod was going to be the RT's and then he was going to post the plug for us? This was his *only* mod. Where did he go? I hate doing Dynos when there is a suspected lean condition myself. I would rather crap a golfball.
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Joined: Jun 2002
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From: Florida
Originally posted by SHIFT_Z
So, it is safe to run the RT cats with the stock ecu? I'm planning to get one soon, but I do not want to making the car running too lean because the cats. And has anyone with the engine lights come on due to the RT cats?
So, it is safe to run the RT cats with the stock ecu? I'm planning to get one soon, but I do not want to making the car running too lean because the cats. And has anyone with the engine lights come on due to the RT cats?
