Installing a H-pipe before 2nd cat on a 2-1-2 exhaust system?
08-02-20, 10:48 AM
#16
Lexus Champion
It's good you caught the lean condition because very bad for your cylinders. Since you are using E85, your problem could be the injectors can't keep up with the amount of fuel that needs to be delivered at low rpm/high load, a classic problem running e. Be careful because I've seen injectors going bad as well as thrown rods with long term E use, at least with 10th gen Civic Si's (thrown rods would be less of an issue with the IS350's 3.5L)
Last edited by AMIRZA786; 08-02-20 at 10:52 AM.
08-02-20, 10:58 AM
#17
Pit Crew
Thread Starter
It's good you caught the lean condition because very bad for your cylinders. Since you are using E85, your problem could be the injectors can't keep up with the amount of fuel that needs to be delivered at low rpm/high load, a classic problem running e. Be careful because I've seen injectors going bad as well as thrown rods with long term E use, at least with 10th gen Civic Si's (thrown rods would be less of an issue with the IS350's 3.5L)
No lean issue now with the normal 2-1-2 pipe installed. But still don't know why a H-pipe can cause it to be lean
08-02-20, 11:46 AM
#18
Lexus Champion
Last edited by AMIRZA786; 08-02-20 at 10:16 PM.
08-03-20, 07:00 AM
#19
Any chance you friends hardware / software can monitor valve timing? Speculation is dumping cylinder pressure by retarding cam advance making lots of overlap effectively recycling its own charge gasses right at the intake/head level.
Those are some very interesting findings. If you had an EGT sensor on a few exhaust ports you'd see the temperature drop swiftly during this lazy period.
I wonder if this is a better solution?
https://www.borla.com/products/proxs...t__400493.html
Those are some very interesting findings. If you had an EGT sensor on a few exhaust ports you'd see the temperature drop swiftly during this lazy period.
I wonder if this is a better solution?
https://www.borla.com/products/proxs...t__400493.html
08-03-20, 10:14 AM
#20
Lexus Champion
Any chance you friends hardware / software can monitor valve timing? Speculation is dumping cylinder pressure by retarding cam advance making lots of overlap effectively recycling its own charge gasses right at the intake/head level.
Those are some very interesting findings. If you had an EGT sensor on a few exhaust ports you'd see the temperature drop swiftly during this lazy period.
I wonder if this is a better solution?
https://www.borla.com/products/proxs...t__400493.html
Those are some very interesting findings. If you had an EGT sensor on a few exhaust ports you'd see the temperature drop swiftly during this lazy period.
I wonder if this is a better solution?
https://www.borla.com/products/proxs...t__400493.html
But also you are right, ethanol tends to have a cooling effect so there is probably a temp drop in his exhaust ports
Last edited by AMIRZA786; 08-03-20 at 10:19 AM.
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