Feels like I've lost power??!
Originally Posted by C6C6CH3vo
rear o2 sensor problem will make it slower in closed loop, but not WOT.
The rear sensor was a guess because of the location of the newest mod,
... and although I can't it would cause a WOT problem since I've ner tried it, I can say the front will cause exactly that
Ask me how I know
Evolved Member
Joined: Nov 2003
Posts: 1,496
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From: Bangkok
Originally Posted by RoadSpike
The cat efficiency CEL from the rear o2 sensor wont kill performance just a nuisance light.
Since our bodies are basically primitive accelerometers maybe the impression of losing torque is simply the feeling of a larger torque curve. Since a rapid increase in torque followed by a sudden taper in torque would appear to be more violent of a smoother larger peak torque curve.
Thus the butt dyno not so good.
you could theoretically "butt dyno" results like this with recovery time by getting to some speed and "feeling" out the maximum thrust. Something like the 3200-3500rpm should give you the best "kick the pants" results i think. Its near the max torque curve for mostly stock cars.
Just my .02
Since our bodies are basically primitive accelerometers maybe the impression of losing torque is simply the feeling of a larger torque curve. Since a rapid increase in torque followed by a sudden taper in torque would appear to be more violent of a smoother larger peak torque curve.
Thus the butt dyno not so good.
you could theoretically "butt dyno" results like this with recovery time by getting to some speed and "feeling" out the maximum thrust. Something like the 3200-3500rpm should give you the best "kick the pants" results i think. Its near the max torque curve for mostly stock cars.
Just my .02
I understand that it is not the most scientific of methods, but to feel no appreciable gain is odd and to feel that there is less power is even more strange. (In fact, most of the time, more power is perceived because of the louder exhaust sound.)
While there remains a possiblity that the OP plainly did not feel the difference, the gains here are (usually for these modifications) large enough that it really should be noticable. Adding to that the problems some members have reported about various sensors in the system not working well with cat-deletes, I feel it is likely that the OP is suffering from these issues.
I do agree that the dyno will tell the whole story, but it does appear very likely that there is a 'software' problem here also.
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Joined: Oct 2006
Posts: 212
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From: Dirty Jersey
Originally Posted by Warrtalon
The lesson here is:
"Do not install a $1000 exhust on a IX without AT LEAST combining it with a tune and/or an MBC."
IX ECUs are notorious for pulling back boost when sensing increased airflow (e.g. upgraded exhaust), so you need an MBC to crank the boost to (and beyond) the stock boost level, plus you need a tune to ensure the ECU doesn't try to compensate by detuning itself.
"Do not install a $1000 exhust on a IX without AT LEAST combining it with a tune and/or an MBC."
IX ECUs are notorious for pulling back boost when sensing increased airflow (e.g. upgraded exhaust), so you need an MBC to crank the boost to (and beyond) the stock boost level, plus you need a tune to ensure the ECU doesn't try to compensate by detuning itself.
Originally Posted by ihatepotholes
um... i had a turbo back, a drop in and an EBC running 19-20psi and i put down 301whp and 264wtq on Turbotrix' dynojet before the tune. ecu did not detune itself
If you didn't have a mbc/ebc then the ecu would detune itself as warr had said.
ihatepotholes... Read the first sentence of Warr's qoute.
You sir have a boost controller that holds your desired setting.
The OP's was not probably hitting max boost (20.x psi) and his stock boost solenoid is bleeding off since the ecu seeing increased airflow.
.
You sir have a boost controller that holds your desired setting.
The OP's was not probably hitting max boost (20.x psi) and his stock boost solenoid is bleeding off since the ecu seeing increased airflow.
.
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