GSL-SE header O2 question
06-22-09, 05:05 PM
#4
If its your stock o2 sensor either pipe will be fine. The road race header is designed for a carbed race car. What a/f guage are you running?
I would suggest the innovative motorsports lm-2 dual channel (2 oxygen sensors)so you could have the precise a/f of each rotor so you'd have to weld a bung on each pipe.
Stock o2 with the autometer a/f guage is useless, that's what I had before and you can't make any judgement baised on it.
I would suggest the innovative motorsports lm-2 dual channel (2 oxygen sensors)so you could have the precise a/f of each rotor so you'd have to weld a bung on each pipe.
Stock o2 with the autometer a/f guage is useless, that's what I had before and you can't make any judgement baised on it.
06-22-09, 05:11 PM
#5
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06-22-09, 05:19 PM
#6
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FWIW I've got the full streetport exhaust setup, and run a Haltech E6K. For tuning purposes I wanted to use one O2 so I welded the bung in the muffler piping where the exhaust merges back into one. With this setup I get the AFRs for both rotors instead of just one. I don't use a narrowband.
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06-23-09, 03:39 PM
#8
Exactly. Sam (dj55b) can tell you the potential problems of only measuring the AFR in one tube. He had installed Venom injectors (later found that these can have problems) and tuned his setup with a wideband. Basically, one injector was flowing like 820cc/min, but one of them actually only flowed 620cc/min. I believe that he happened to have his O2 on the richer rotor and tuned to that. The other rotor went lean and blew his engine.
https://www.rx7club.com/showthread.p...t=venom&page=9
Safest bet is to run a dual channel WB O2 or put the WB O2 sensor where the pipes merge near the muffler. This is fine on a WB. For unheated NB O2 sensors (like the stock GSL-SE one), the sensor needs to be hot to read correctly and must be located near the exhaust ports. Heated NB O2 sensors and WB sensors can work in cooler conditions.
If you are tuning a setup (carb or aftermarket EFI), wideband is the only way to go. If you where putting this exhaust on a factory EFI setup (say a GSL-SE), you could just stick a narrowband in one of the tubes.
https://www.rx7club.com/showthread.p...t=venom&page=9
Safest bet is to run a dual channel WB O2 or put the WB O2 sensor where the pipes merge near the muffler. This is fine on a WB. For unheated NB O2 sensors (like the stock GSL-SE one), the sensor needs to be hot to read correctly and must be located near the exhaust ports. Heated NB O2 sensors and WB sensors can work in cooler conditions.
If you are tuning a setup (carb or aftermarket EFI), wideband is the only way to go. If you where putting this exhaust on a factory EFI setup (say a GSL-SE), you could just stick a narrowband in one of the tubes.
09-28-09, 02:08 AM
#9
Exactly. Sam (dj55b) can tell you the potential problems of only measuring the AFR in one tube. He had installed Venom injectors (later found that these can have problems) and tuned his setup with a wideband. Basically, one injector was flowing like 820cc/min, but one of them actually only flowed 620cc/min. I believe that he happened to have his O2 on the richer rotor and tuned to that. The other rotor went lean and blew his engine.
https://www.rx7club.com/showthread.p...t=venom&page=9
Safest bet is to run a dual channel WB O2 or put the WB O2 sensor where the pipes merge near the muffler. This is fine on a WB. For unheated NB O2 sensors (like the stock GSL-SE one), the sensor needs to be hot to read correctly and must be located near the exhaust ports. Heated NB O2 sensors and WB sensors can work in cooler conditions.
If you are tuning a setup (carb or aftermarket EFI), wideband is the only way to go. If you where putting this exhaust on a factory EFI setup (say a GSL-SE), you could just stick a narrowband in one of the tubes.
https://www.rx7club.com/showthread.p...t=venom&page=9
Safest bet is to run a dual channel WB O2 or put the WB O2 sensor where the pipes merge near the muffler. This is fine on a WB. For unheated NB O2 sensors (like the stock GSL-SE one), the sensor needs to be hot to read correctly and must be located near the exhaust ports. Heated NB O2 sensors and WB sensors can work in cooler conditions.
If you are tuning a setup (carb or aftermarket EFI), wideband is the only way to go. If you where putting this exhaust on a factory EFI setup (say a GSL-SE), you could just stick a narrowband in one of the tubes.
09-28-09, 06:59 AM
#10
I was close. I guess I was thinking you had the O2 before the collector. Anyway, the safest bet is to run a dual channel WBO2. This way you can monitor both pipes. This will also let you know if an injector is clogged or if you have a clogged jet in your carb.
If you can't afford this option, perhaps a single channel WB02 where you collect. You could add a pair of narrow band O2 sensors up front and use a switch to periodically switch between the front and rear rotor. Narrow bands aren't great, but they should at least point out if something is really wrong on one of the rotors.
EGT is another great tool to see what is going on as well.
If you can't afford this option, perhaps a single channel WB02 where you collect. You could add a pair of narrow band O2 sensors up front and use a switch to periodically switch between the front and rear rotor. Narrow bands aren't great, but they should at least point out if something is really wrong on one of the rotors.
EGT is another great tool to see what is going on as well.
09-28-09, 08:53 AM
#11
I have to correct myself in my first post, but i meant to say that I DID have EGT's in there and NOT "didn't". I should of looked into it but Injectors would of still been my last thing to look at. One lesson that I've learned though is to flow test every set of injector that I get in.
09-29-09, 03:09 AM
#12
No distributor? No thanks
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Exactly. Sam (dj55b) can tell you the potential problems of only measuring the AFR in one tube. He had installed Venom injectors (later found that these can have problems) and tuned his setup with a wideband. Basically, one injector was flowing like 820cc/min, but one of them actually only flowed 620cc/min. I believe that he happened to have his O2 on the richer rotor and tuned to that. The other rotor went lean and blew his engine.
https://www.rx7club.com/showthread.p...t=venom&page=9
Safest bet is to run a dual channel WB O2 or put the WB O2 sensor where the pipes merge near the muffler. This is fine on a WB. For unheated NB O2 sensors (like the stock GSL-SE one), the sensor needs to be hot to read correctly and must be located near the exhaust ports. Heated NB O2 sensors and WB sensors can work in cooler conditions.
If you are tuning a setup (carb or aftermarket EFI), wideband is the only way to go. If you where putting this exhaust on a factory EFI setup (say a GSL-SE), you could just stick a narrowband in one of the tubes.
https://www.rx7club.com/showthread.p...t=venom&page=9
Safest bet is to run a dual channel WB O2 or put the WB O2 sensor where the pipes merge near the muffler. This is fine on a WB. For unheated NB O2 sensors (like the stock GSL-SE one), the sensor needs to be hot to read correctly and must be located near the exhaust ports. Heated NB O2 sensors and WB sensors can work in cooler conditions.
If you are tuning a setup (carb or aftermarket EFI), wideband is the only way to go. If you where putting this exhaust on a factory EFI setup (say a GSL-SE), you could just stick a narrowband in one of the tubes.
They're cheap enough, why not just tap two bungs with two cheapo sensors, and get a double pole switch that will allow a gauge to sample between either. Cheap, and you can learn a lot.
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