When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
[clarification question] Wideband placement and SS turbo manifolds.
From what I have read , the rule of thumb says to place your Lambda Sensor about 31-36" from the turbo. Seems straight forward. Most turbos are mated to a cast manifold that hugs the keg. The variable I'm considering is the length of my manifold runners (15") . should I deduct the runner length from the suggested 31-36" and place the sensor 21" from the turbo? Or is the "from the turbo a hard fact, no matter the distance of the turbo from the exhaust port?
On a rotary it's generally about heat management, especially if it's an innovate controller. You need to consider transient time and sensor response time for closed loop control too. There is no hard and fast rules.
From what I have read , the rule of thumb says to place your Lambda Sensor about 31-36" from the turbo. Seems straight forward. Most turbos are mated to a cast manifold that hugs the keg. The variable I'm considering is the length of my manifold runners (15") . should I deduct the runner length from the suggested 31-36" and place the sensor 21" from the turbo? Or is the "from the turbo a hard fact, no matter the distance of the turbo from the exhaust port?
Thank you
I installed a innovative setup with heatsink about 30 inches from the turbine discharge and the sensors did not last 30 mins. I started gettting false readings.....Lots of guys have trouble with innovatie and high power rotaries. I then got an AEM setup ( no heatsink ) and extended another 12 inches back and zero problems now. Im seeing EGTs at the runners of about 1700 full load FYI.
the one on mine is less than 24” past the turbo, maybe less than 18”, without a heat sink and sees the expected rotary egt just past the exhaust port it does have a forward mount turbo position though.
I’m siding with “no hard and fast rules” because the actual details likely matter …
the one on mine is less than 24” past the turbo, maybe less than 18”, without a heat sink and sees the expected rotary egt just past the exhaust port it does have a forward mount turbo position though.
I’m siding with “no hard and fast rules” because the actual details likely matter …
edit: maybe 12” or less
. .
.
it all depends what kind of driving you do and fuel type. Just daily it may last but a track car no way. Interesting manifold….whats the logic behind the crossover?
It was fabricated by the prior owner; the single wastegate is positioned on the crossover, just not installed yet on that pic. Not really ideal particularly considering it’s bridgeported and the likely gas reversion occurring there between the two pipes, but considering how little he was investing into the car it works pretty decent for what it is. The junkyard engine should have done gone blowed up at least a dozen or more times, but just keeps on going. So far it was a street-play & drag car, but I had it on the dyno for 2 hours back in Dec. making sixteen 4th gear runs and around 1600°F EGT (dash gauge) in addition to whatever came before for whatever that’s worth. It obviously isn’t an immediate failure any way.
suppose we’re in agreement on the “ no hard and fast rules” assessment though.
After seeing that manifold that TeamRX8 shared..eek. This one is mine. 321 Stainless. Goes into a SA22C. Running a BNR turbo so its internally waste gated. I had just sprayed it with Ceracote Glacier coating. I didn't do the welding but I'm proud of the work that was done.
From what I have read , the rule of thumb says to place your Lambda Sensor about 31-36" from the turbo. Seems straight forward. Most turbos are mated to a cast manifold that hugs the keg. The variable I'm considering is the length of my manifold runners (15") . should I deduct the runner length from the suggested 31-36" and place the sensor 21" from the turbo? Or is the "from the turbo a hard fact, no matter the distance of the turbo from the exhaust port?
Thank you
Mine is mounted approx. 14 inches away from the turbo on the DP, which when I factor in the length of the exhaust manifold tubes (it's a long runner piece) is approx. 26~28 inches from the exhaust ports. Been running this way for about 2-1/2 years with zero problems. No special heat sinks or anything, just a standard Bosch LSU 4.9 WBO2 sensor.
it does have a forward mount turbo position though.
but serves the purpose until that day comes.
