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Old 09-28-2013, 03:37 PM   #21
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Just clicked in my head once you mentioned that, thanks Vlad.
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Old 09-28-2013, 03:47 PM   #22
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Quote:
Originally Posted by Harv View Post
I get the idea from the nuge's pic, so basically you end up with individual runners on each exhaust cylinder and each one gets a wideband.
Yep. The sensors don't last long, obviously, so you install them for tuning and then remove them for regular use (like Dimitris has done). I have an AEM 4-channel controller but haven't had time to put it to use.
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Old 09-28-2013, 04:19 PM   #23
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I also have 4 HBX-1 heatsinks in there now (I used to have the DIY copper heatsinks as recommended by Innovate, however they would crack on a regular basis due to vibrations), so the sensors last a little longer than expected.

Btw I do have the sensors installed on a permanent basis as I am always testing ECUs on my car.
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Old 09-28-2013, 04:24 PM   #24
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EGT would be much more reliable, not to mention cheaper.

Ive been thinking of building a multiple channel EGT setup using some AD595 thermocouple amplifiers. Theyre kinda of expensive pieces of silicon (~$15 each), but not much else is required to build it, and thats still nothing compared to widebands.

EDIT:
Another cool thing about EGT is that you can see detonation.
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Old 09-28-2013, 06:39 PM   #25
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You can see exactly zero det from EGTs. Ask me how I know.
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Old 09-29-2013, 01:56 AM   #26
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User error I think.
Its probably useless for catching detonation while driving the car, but if youre logging it on the dyno you should see a sudden drop in EGT when detonation occurs. Unfortunately this is so counter-intuitive that people have frequently made the mistake of not interpreting the drop in EGT as a bad thing.
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Old 09-29-2013, 02:04 AM   #27
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Dimitris, how much effort did you go to ensuring the EGT and WB bungs and the parts which block them when not in use do not impede flow?

I wonder if simply not protruding into the cylinder is enough.

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Old 09-29-2013, 05:05 AM   #28
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Zero effort. This is my DD/mobile lab/track toy, so even if I lose 5hp because of the reduced flow, I don't care.
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Old 09-29-2013, 05:06 AM   #29
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Quote:
Originally Posted by Full_Tilt_Boogie View Post
User error I think.
Its probably useless for catching detonation while driving the car, but if youre logging it on the dyno you should see a sudden drop in EGT when detonation occurs. Unfortunately this is so counter-intuitive that people have frequently made the mistake of not interpreting the drop in EGT as a bad thing.
We saw nothing at 25psi on the dyno, AFRs were stable, EGT was stable, then poof, white smoke (ouch - hello, can I haz open window, stuffy in here blah blah blah.
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