|
Soft Rev Limit & Boost
According to the 2.6 Hydra users manual, the soft rev limit "begins to cut fuel events to reduce torque output and produce a “soft” limiting effect on engine speed."
Since it is a rev limiter it is typically going to be doing this at high rpm and high load (max boost). I would think pulling fuel under those conditions, especially on a boosted car, would be a very bad idea. Am I missing something here? Should I set my hard rev limit lower than the soft and let it just cut ignition to begin with? |
Originally Posted by disney7
(Post 871888)
According to the 2.6 Hydra users manual, the soft rev limit "begins to cut fuel events to reduce torque output and produce a “soft” limiting effect on engine speed."
Since it is a rev limiter it is typically going to be doing this at high rpm and high load (max boost). I would think pulling fuel under those conditions, especially on a boosted car, would be a very bad idea. Am I missing something here? Should I set my hard rev limit lower than the soft and let it just cut ignition to begin with? |
It will cut fuel sprayed per combustion stroke
Now auck me |
My understanding is, as you thought, that cutting fuel on a boosted engine is a bad thing. So using the ignition cut out is much safer.
|
It probably cuts it completely... many stock turbo cars have a fuel cut overboost protection on them. It was fine.
|
Originally Posted by concealer404
(Post 916135)
It probably cuts it completely... many stock turbo cars have a fuel cut overboost protection on them. It was fine.
|
Originally Posted by dynodragon
(Post 916758)
Yes, and fine for the safe boost that OEM's use. Pushing 15+ psi on an engine not originally built for a turbo is a different scenario. If you have the capability of choosing fuel cut or ignition cut, why not choose the latter and eliminate the lean mixture risk?
|
Originally Posted by dynodragon
(Post 916758)
Yes, and fine for the safe boost that OEM's use. Pushing 15+ psi on an engine not originally built for a turbo is a different scenario. If you have the capability of choosing fuel cut or ignition cut, why not choose the latter and eliminate the lean mixture risk?
Originally Posted by Faeflora
(Post 916799)
Not how fuel cut works. Typically revlimit cuts a percentage of ingnution or fuel events. If there is no fuel in cylinder, you are not lean. There is just air. Nothing to burn.
That said, if i had the choice, i'd go with ignition as well. Mostly because i'm a ricer and think it sounds cool. |
Originally Posted by disney7
(Post 871888)
According to the 2.6 Hydra users manual, the soft rev limit "begins to cut fuel events to reduce torque output and produce a “soft” limiting effect on engine speed."
Since it is a rev limiter it is typically going to be doing this at high rpm and high load (max boost). I would think pulling fuel under those conditions, especially on a boosted car, would be a very bad idea. Am I missing something here? Should I set my hard rev limit lower than the soft and let it just cut ignition to begin with? The purpose of soft and hard limit is for driveability.
Originally Posted by concealer404
(Post 916843)
Not how it works.
How it works. That said, if i had the choice, i'd go with ignition as well. Mostly because i'm a ricer and think it sounds cool. Yah. It is cool. Actually it is frikken awesome. One of te joys of turbo car |
Originally Posted by concealer404
(Post 916843)
That said, if i had the choice, i'd go with ignition as well. Mostly because i'm a ricer and think it sounds cool.
|
It washes down the cylinders, increases the chances of fouling the plugs, sends your turbine housing temps through the roof, and will add quite a bit of spool to your turbo when you might be trying to limit boost (if you are using it for boost cut and not rev-limiter).
|
Originally Posted by Faeflora
(Post 916799)
Not how fuel cut works. Typically revlimit cuts a percentage of ingnution or fuel events. If there is no fuel in cylinder, you are not lean. There is just air. Nothing to burn.
|
| All times are GMT -4. The time now is 09:16 PM. |
© 2024 MH Sub I, LLC dba Internet Brands