Drive By Wire - Page 3

hemidup · 11-21-2010, 02:16 AM

Quote:

Originally Posted by Jeff Lee

I don't know....all I know is I can take my Ford Expedition in the driveway and floor in in neutral or park and it will only go to about 2500 RPM and it makes lots of "whup whup" sounds...

You can do it in your drive way, but can you do it at the big end? Maybe with a Furd, but not with my Mopar DBW.

Jeff Lee · 11-21-2010, 03:08 AM

Can't imagine if something is done on one part of a program it can't be made to be done on another part of the program. Oh, dang it! Just fell off the turnip truck again!

Ed Wright · 11-21-2010, 09:37 AM

Jeff, that's a rev limiter. There is one for each gear. Rev limiters for park, neutral and reverse are normally set much lower than forward gears. The computer is cutting the fuel injectors off & on over and over. Makes that wop wop sound.

darkside · 11-21-2010, 10:03 AM

Stupid questin but don't some of the FI cars even have a laptop in them hooked up when they run?

Ed Wright · 11-21-2010, 10:11 AM

Not supposed to. If you have time to screw with a lap top during a pass, you have a really slow car! lol

Dgal · 11-21-2010, 10:43 AM

Quote:

Originally Posted by Ed Wright

Not supposed to. If you have time to screw with a lap top during a pass, you have a really slow car! lol

My buddy said he would text you whether or not he should take the stripe.

Any truth to that?

He said not to talk about the starting line incident in Noble. He is still in therapy.

Don

Ed Wright · 11-21-2010, 11:00 AM

Your buddy is defective, you know that right?

Dgal · 11-21-2010, 11:13 AM

Quote:

Originally Posted by Ed Wright

Your buddy is defective, you know that right?

Yes I do! That is why we get along so well.

Don

Larry Hill · 11-21-2010, 11:21 AM

Does anyone think that Kevin Cour added 900 lbs to his car to slow it down .9 of a second to run Fletcher second round? According to "Live Timing" Cour was on a high 9.60's run @ 138+ Mph when he ran Norton first round. Second round Cour dials 10.57 and runs 10.562. Compare the two runs and '60 ft. is only down .096 on the on 10.562 run. Maybe they took 90 hp. from the engine on tune up, if they did it would not 60 ft. with a .1 of a second from the high 9.60s run. What I think happened the ECM was programmed to open throttle, at let's say 75% at the hit and run at, let's pick a number, 57% the rest of the run. His 60ft was quicker on the 10.562 run than on the 10.531 run in qualifying.

If NHRA would change the rule to "No drive by wire", a lot of the temptation would be removed. Anytime you have a computer controlling the air supply to the engine, the driver is just along for the ride. The fix would be a cable from the accelerator to the throttle shaft on one side and a throttle positioning sensor to tell the computer what it's position is. As opposed to programming the computer and letting it operate the throttle plates to trace a previous run.

Billy, I read the 2009 rulebook and you are right. Either the Fords didn't go by the rules or NHRA turned a blind eye.

For me personally, I want redundancy (a return spring) in closing the throttle. Just in case something goes wrong.

Jeff Teuton · 11-21-2010, 11:26 AM

The 2011 Challenger V10 has removed the DBW throttle, in favor of manual bodies with a cable. Don't know if that was mandated or voluntarily done. I don't know what they are going to do about the 2012 Drag Pak.

11-21-2010, 03:08 AM	#22
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 2 Times in 2 Posts	Re: Drive By Wire Can't imagine if something is done on one part of a program it can't be made to be done on another part of the program. Oh, dang it! Just fell off the turnip truck again! __________________ Jeff Lee 7494 D/S '70 AMX

11-21-2010, 09:37 AM	#23
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 389 Times in 168 Posts	Re: Drive By Wire Jeff, that's a rev limiter. There is one for each gear. Rev limiters for park, neutral and reverse are normally set much lower than forward gears. The computer is cutting the fuel injectors off & on over and over. Makes that wop wop sound. __________________ Ed Wright 4156 SS/JA

11-21-2010, 10:03 AM	#24
darkside Junior Member Join Date: Nov 2006 Posts: 56 Likes: 0 Liked 0 Times in 0 Posts	Re: Drive By Wire Stupid questin but don't some of the FI cars even have a laptop in them hooked up when they run? __________________ Lynn Ellison

11-21-2010, 10:11 AM	#25
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 389 Times in 168 Posts	Re: Drive By Wire Not supposed to. If you have time to screw with a lap top during a pass, you have a really slow car! lol __________________ Ed Wright 4156 SS/JA

11-21-2010, 11:00 AM	#27
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 389 Times in 168 Posts	Re: Drive By Wire Your buddy is defective, you know that right? __________________ Ed Wright 4156 SS/JA

11-21-2010, 11:21 AM	#29
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,317 Likes: 1,673 Liked 9,555 Times in 1,985 Posts	Re: Drive By Wire Does anyone think that Kevin Cour added 900 lbs to his car to slow it down .9 of a second to run Fletcher second round? According to "Live Timing" Cour was on a high 9.60's run @ 138+ Mph when he ran Norton first round. Second round Cour dials 10.57 and runs 10.562. Compare the two runs and '60 ft. is only down .096 on the on 10.562 run. Maybe they took 90 hp. from the engine on tune up, if they did it would not 60 ft. with a .1 of a second from the high 9.60s run. What I think happened the ECM was programmed to open throttle, at let's say 75% at the hit and run at, let's pick a number, 57% the rest of the run. His 60ft was quicker on the 10.562 run than on the 10.531 run in qualifying. If NHRA would change the rule to "No drive by wire", a lot of the temptation would be removed. Anytime you have a computer controlling the air supply to the engine, the driver is just along for the ride. The fix would be a cable from the accelerator to the throttle shaft on one side and a throttle positioning sensor to tell the computer what it's position is. As opposed to programming the computer and letting it operate the throttle plates to trace a previous run. Billy, I read the 2009 rulebook and you are right. Either the Fords didn't go by the rules or NHRA turned a blind eye. For me personally, I want redundancy (a return spring) in closing the throttle. Just in case something goes wrong. __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

11-21-2010, 11:26 AM	#30
Jeff Teuton VIP Member Join Date: Jan 2002 Location: Houma, LA Posts: 2,717 Likes: 2 Liked 326 Times in 50 Posts	Re: Drive By Wire The 2011 Challenger V10 has removed the DBW throttle, in favor of manual bodies with a cable. Don't know if that was mandated or voluntarily done. I don't know what they are going to do about the 2012 Drag Pak. __________________ Jeff Teuton 4022 STK