Boost by gear sensor
Thread Starter
Racer
Joined: Jan 2010
Posts: 293
Likes: 2
From: Atlanta Georgia
Louis would you like to post up a picture or describe in detail what you and Shannon Davis have designed to pick up the crank speed for my set up.
Takes a reading every 1/6th a turn of the DS/torque. should be able to detect slip within the first few inches of it happening.
No spinning for me!
Also the M/T 345's didn't hook very well for me with out a 4-5 second 2nd gear burnout. The NT05r's don't need a burnout if it is +70 degrees outside. And they look 10X better. The M/T are a tad bit better on the 60ft because of the sidewall.
Takes a reading every 1/6th a turn of the DS/torque. should be able to detect slip within the first few inches of it happening.
No spinning for me!
Also the M/T 345's didn't hook very well for me with out a 4-5 second 2nd gear burnout. The NT05r's don't need a burnout if it is +70 degrees outside. And they look 10X better. The M/T are a tad bit better on the 60ft because of the sidewall.
In basic, I read the front wheel speed and rear wheel speed and compare the two to determine slip. Obviously, this is extremely simplified. Most of the work (after the signals representing the wheel speeds are acquired) goes into sampling rates and method of determining which ratios constitute spinning (usually trial and error). I will dig deeper into doing this on my Z06 in the immediate future (very immediate future). I have developed some other control modules on my car so I already have a very high speed processor that I can calculate the data and feed that to the AMS that then controls boost. It should be noted that in an ideal world, this method will only be used to calibrate your boost controller and determine how much boost to run in each gear.
Thanks so much on the NTO5R input. I am currently deciding between 19" NTO5R 345 drag radials and swapping wheels going to MT 345/35-18. So you would stay with 19" and go with NITTO? How did your times compare with these two tires?
Josh
Last edited by jatolbert; May 13, 2011 at 01:56 PM.
Racer
Joined: Jan 2008
Posts: 361
Likes: 1
From: Charleston SC
I dont know a Shannon Davis. Maybe you meant something we did seperately and want to get both of our input. I havent gone into great detail as far as doing it specifically on my car, I just have done similar things in other applications, both in my line of work and personally.
In basic, I read the front wheel speed and rear wheel speed and compare the two to determine slip. Obviously, this is extremely simplified. Most of the work (after the signals representing the wheel speeds are acquired) goes into sampling rates and method of determining which ratios constitute spinning (usually trial and error). I will dig deeper into doing this on my Z06 in the immediate future (very immediate future). I have developed some other control modules on my car so I already have a very high speed processor that I can calculate the data and feed that to the AMS that then controls boost. It should be noted that in an ideal world, this method will only be used to calibrate your boost controller and determine how much boost to run in each gear.
Thanks so much on the NTO5R input. I am currently deciding between 19" NTO5R 345 drag radials and swapping wheels going to MT 345/35-18. So you would stay with 19" and go with NITTO? How did your times compare with these two tires?
Josh
In basic, I read the front wheel speed and rear wheel speed and compare the two to determine slip. Obviously, this is extremely simplified. Most of the work (after the signals representing the wheel speeds are acquired) goes into sampling rates and method of determining which ratios constitute spinning (usually trial and error). I will dig deeper into doing this on my Z06 in the immediate future (very immediate future). I have developed some other control modules on my car so I already have a very high speed processor that I can calculate the data and feed that to the AMS that then controls boost. It should be noted that in an ideal world, this method will only be used to calibrate your boost controller and determine how much boost to run in each gear.
Thanks so much on the NTO5R input. I am currently deciding between 19" NTO5R 345 drag radials and swapping wheels going to MT 345/35-18. So you would stay with 19" and go with NITTO? How did your times compare with these two tires?
Josh
I've heard about the abs front to rear wheel speed to determine slip. It works but it is not quite a high enough resolution. There is still a tenth or two left on the table when using the abs sensors. The Prostock/10.5 Outlaw guys run the Davis Traction Control because it catches slip faster which inturn will require less power reduction to control slip. The problem for us C6 guys is we don't have a DS/DS speed sensor. We have to measure gear speed in the diff. Louis developed a pinion nut/sensor/diff cover to allow us to measure crank shaft speed. This is still a work in progress though.
Thread Starter
Racer
Joined: Jan 2010
Posts: 293
Likes: 2
From: Atlanta Georgia
Louis would you like to post up a picture or describe in detail what you and Shannon Davis have designed to pick up the crank speed for my set up.
Takes a reading every 1/6th a turn of the DS/torque. should be able to detect slip within the first few inches of it happening.
No spinning for me!
Takes a reading every 1/6th a turn of the DS/torque. should be able to detect slip within the first few inches of it happening.
No spinning for me!
Former Vendor
Joined: May 2003
Posts: 2,173
Likes: 2
From: Dallas Texas
GPS is too slow... plus it will drop out with inclement weather. Its a great idea, but its just not up to par yet.
If you measure ground speed, you are looking at measuring the wheel slip differential, in percent.
We are having two similar discussions here, both related to the same problem- traction.
Being able to control boost precisely is important, as this is our main form of power delivery.
Being able to control power, down to the measuring wheel slip every rotation based off of target ground speed vs drive speed slip differential is another discussion.
Shannon Davis is the creator of the ROA box used on Seb @ NLR's turbo bike. Its also what the majority of the big turbo cars use to get their 3000+ hp cars down the track.
We are getting into race car knowledge and technology for the street.
I will post pics, or Ill let someone else post them.
Louis
If you measure ground speed, you are looking at measuring the wheel slip differential, in percent.
We are having two similar discussions here, both related to the same problem- traction.
Being able to control boost precisely is important, as this is our main form of power delivery.
Being able to control power, down to the measuring wheel slip every rotation based off of target ground speed vs drive speed slip differential is another discussion.
Shannon Davis is the creator of the ROA box used on Seb @ NLR's turbo bike. Its also what the majority of the big turbo cars use to get their 3000+ hp cars down the track.
We are getting into race car knowledge and technology for the street.
I will post pics, or Ill let someone else post them.
Louis
Thread Starter
Racer
Joined: Jan 2010
Posts: 293
Likes: 2
From: Atlanta Georgia
