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Innovate O2 Sensor Exhaust Clamp

Has anyone used the Innovate 3728 Exhaust clamp? They say you will get slightly leaner readings at idle. I don't want to weld a bung on my 930's exhaust. Has anyone used this setup to get accurate AFR readings?
Old 08-12-2017, 04:02 PM
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Crotchety Old Bastard
 
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I use it for tuning client's cars. Idle doesn't matter that much, it's cruise and boost you need to concentrate on.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 08-12-2017, 04:46 PM
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Quote:
Originally Posted by RarlyL8 View Post
I use it for tuning client's cars. Idle doesn't matter that much, it's cruise and boost you need to concentrate on.
Thanks for the response. Does it stay in position when you take it down the road at boost levels?
Old 08-12-2017, 05:16 PM
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I have one and it holds when testing
btw can you relly on that CO to afr chart?
thanks
Old 08-12-2017, 09:39 PM
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Crotchety Old Bastard
 
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It has a thumb screw clamp which only does a good job if you use plyers to tighten. This is a problem if you have nice tailpipes that you don't want to mark up.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 08-13-2017, 04:40 AM
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Quote:
Originally Posted by RarlyL8 View Post
It has a thumb screw clamp which only does a good job if you use plyers to tighten. This is a problem if you have nice tailpipes that you don't want to mark up.
For sure, mine blew off, never could get it tight enough. Was thinking of a small spot weld. Finally sold it to a tuner that did not tune turbo's.
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Old 08-13-2017, 10:04 AM
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I noticed .5 leaner with with clamp vs weld in. I found it was best used with the rpm converter. I would make 3,000-7,000 rpm blasts on slightly up hill on-ramps. Then down load onto a laptop.
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Harold
'79 930/DP935
Old 08-13-2017, 11:11 AM
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Quote:
Originally Posted by RarlyL8 View Post
It has a thumb screw clamp which only does a good job if you use plyers to tighten. This is a problem if you have nice tailpipes that you don't want to mark up.
This could be an issue depending on where I locate the threaded screw to visibally see the clamp mark; my outlet pipe is very nicely chrome polished.

I read somewhere on this turbo forum where someone only did the AFR at idle and enrichened it to 13.7. If I take into consideration what gumba stated of a .5 leaner measurement with the clamp-on and set it accordingly; I could place some sheet metal protection between the thread clamp and my chrome outlet. Years ago, when the car had to pass state emissions, I had a local shop set the AFR, they did it at idle; the car ran fine and I never had a problem.

I could lean towards a slightly richer mixture; this would definitely be better than leaner.
Old 08-13-2017, 11:59 AM
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Better yet; I could clamp on a heavy duty T bolt hose clamp at the same location where the exhaust clamp screw contacts the exhaust outlet.
Old 08-13-2017, 12:21 PM
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I would want to confirm a/f at full boost under load. Either a chassis dyno or slightly inclined on ramp or road, 3rd gear from 3,000 to red line.
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'79 930/DP935
Old 08-13-2017, 02:26 PM
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Crotchety Old Bastard
 
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Quote:
I could clamp on a heavy duty T bolt hose clamp at the same location where the exhaust clamp screw contacts the exhaust outlet
That's what I ended up doing after losing one like Tony. Ground a flat spot on the exhaust clamp so the t-bolt clamp would not slip off. I also secure the pigtail to the license plate so the thing won't sling around and damage the car if it gets loose. The design is really not very good, there should be an adjustable clamp incorporated.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 08-13-2017, 03:46 PM
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