Vararam+200mph = ?
Thread Starter
Melting Slicks
Joined: Feb 2013
Posts: 2,034
Likes: 111
good stuff guys!
check out this C5 wind tunnel video
this one is interesting too with C5 demo starting at 4:24
looks to me like the front of a C5 is "pointy" enough to avoid having turbulent air right there at the nose area where the vararam takes in air. When I call vararam though I'll ask them some detailed questions.
I emailed a few standing mile nitrous C5 guys also to see if anyone has any personal experience they can share as well.
thanks guys!
check out this C5 wind tunnel video
this one is interesting too with C5 demo starting at 4:24
looks to me like the front of a C5 is "pointy" enough to avoid having turbulent air right there at the nose area where the vararam takes in air. When I call vararam though I'll ask them some detailed questions.
I emailed a few standing mile nitrous C5 guys also to see if anyone has any personal experience they can share as well.
thanks guys!
Safety Car
Joined: Aug 2000
Posts: 4,537
Likes: 84
From: St. Joseph MO
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Cruise-In IV Veteran
Another thing to consider is that your gonna be on the bottle for over 10-15 seconds. So have a warm bottle and good heater or a NANO kit ready. With a warm 10lb bottle and 150hp shot I would start at 1100-50psi and be at like 670's at the end of the mile spraying part of 4th and all of 5th gear. That was with a -4 line and Nitrous Outlet big solenoids. So the lower bottle pressure drops are gonna throw your fueling off and make you go richer in the top end.
Thread Starter
Melting Slicks
Joined: Feb 2013
Posts: 2,034
Likes: 111
Another thing to consider is that your gonna be on the bottle for over 10-15 seconds. So have a warm bottle and good heater or a NANO kit ready. With a warm 10lb bottle and 150hp shot I would start at 1100-50psi and be at like 670's at the end of the mile spraying part of 4th and all of 5th gear. That was with a -4 line and Nitrous Outlet big solenoids. So the lower bottle pressure drops are gonna throw your fueling off and make you go richer in the top end.
that's a really good point. The setup I have planned will be running two 10lb bottles simultaneously, each with bottle heaters so hopefully that will help but the bottle psi drops you are experiencing is more than I was expecting. Great info!
I put a call into Vararam today and they said they'll have their tech call me back so we'll see how it goes. It sounds like the nitrous bottle pressure drop should more than offset the potentially increased air flow too and from the standing mile guys I have talked to it seems like the increased air from "ram air" systems, even at 175mph+, is not enough to cause tuning issues.
thanks guys!
Instructor
Joined: Feb 2014
Posts: 227
Likes: 69
From: Hawaii
I'm thinking you shouldn't have to make any tuning adjustment for the Vararam. You are still using the Mass Airflow Sensor, right? It will simply measure the Mass of air passing through the sensor and add the indicated amount fuel. It is not pressure dependent. Just like when you go from the high altitude + low pressure to sea level and high pressure, you don't have to add fuel. As long as you are not maxing out the MAF sensor, and as long as the cells in the fueling table are filled in a linear fashion, you should be good to go. Unless there is something else I am missing?
Le Mans Master
Joined: Mar 2002
Posts: 5,955
Likes: 161
From: PNW
I'm thinking you shouldn't have to make any tuning adjustment for the Vararam. You are still using the Mass Airflow Sensor, right? It will simply measure the Mass of air passing through the sensor and add the indicated amount fuel. It is not pressure dependent. Just like when you go from the high altitude + low pressure to sea level and high pressure, you don't have to add fuel. As long as you are not maxing out the MAF sensor, and as long as the cells in the fueling table are filled in a linear fashion, you should be good to go. Unless there is something else I am missing?
Melting Slicks
Joined: Feb 2001
Posts: 2,803
Likes: 357
From: Northville, MI
Many years ago, there was a discussion at the Detroit Auto show with engineers from Chevrolet racing about the Veraram, its location, diameter, etc and as I recall they indicated the air pickup points were in a low pressure area and around 130 mph it would not push as much air is a Callaway Honker type. That was why most of the C5's racing high speed tracks preferred that type of airflow. Also, the air pathway for the Veraram was compromised at speeds over 150 compared to a bottom feader or front license plate area.. When Danny Kellermeyer was running his C5 I believe he ran a Donaldson before switching to the Front license plate area for air intake.
Safety Car
Joined: Aug 2000
Posts: 4,537
Likes: 84
From: St. Joseph MO
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Cruise-In IV Veteran
If MAF equiped the MAF is used until its maxed out output wise. The MAP is always used to allow the engine to know which table segments to use for fueling and timing.
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Thread Starter
Melting Slicks
Joined: Feb 2013
Posts: 2,034
Likes: 111
Many years ago, there was a discussion at the Detroit Auto show with engineers from Chevrolet racing about the Veraram, its location, diameter, etc and as I recall they indicated the air pickup points were in a low pressure area and around 130 mph it would not push as much air is a Callaway Honker type. That was why most of the C5's racing high speed tracks preferred that type of airflow. Also, the air pathway for the Veraram was compromised at speeds over 150 compared to a bottom feader or front license plate area.. When Danny Kellermeyer was running his C5 I believe he ran a Donaldson before switching to the Front license plate area for air intake.