hi,

alright, i was reading about the new bmw m3 SMG tranny. it has a feature for launching that holds the revs at a constant or "optimal" place so it launches the same 10 out of 10 times. i was thinking is there a way to have my chip custom burned to achieve something like this? i was thinking having my "no load" rev limiter set for whatever would be the optimal rpms for drop clutch launches. there for when i have the clutch down i just give her gas and the revs will go to the predetermined destination and stay there. then when i want to launch i can drop the clutch and get a 100% efficiancy on launches. has anyone done something like this? would it work? thanks for the info guys. just trying to think up things that have for sure already been thought of.

 

Hi LBC150,

You don't need anything like that, nor is that practical on a 4.2 V-6 F-150 pickup truck.

We do not advise changing the no-load rev limiter, it's there for a reason, and that reason is not racing, it's because that is the maximum safe engine speed with no load on the motor. Exceeding that is a great way to spin a bearing or throw a rod.

Besides, having the same rpm is not going to give you exact the same launch, far more than rpm goes into the launch. Like the condition of the clutch in a 2-3 ton pickup truck, for one, which isn't going to stand up to many clutch dumps before it or the rear end fails.

You have plenty of rpm available to you under no load already, it does not need to be raised. You would do far better to educate yourself on launch techniques and practicing your launch skills than you would ever get from having a no-load rev limiter changed. This isn't a drag car, it's a daily driver pickup truck.

First you'd have to know what the exact optimal clutch-dump point actually is, and that will vary based on the pavement, macadam, asphault, concrete, etc. For any number of reasons, this is highly impractical on anything other than a dedicated drag car.

If you want to pick an arbitrary number out of the blue and have us change the no-load rev limiter, give us a call and we can take a look to see what's happening in your particular code and whether that can be done on your code or not,

 

i see what you are saying...but i did not mean raise it. i meant lower it to whatever would be optimal. this , seems like it would not hurt my engine and would actually be safer having it set lower. i realize what you are saying that launching surface is a large factor as well as clutch condition/existing mods probably also. i was just looken for a way to get consistancy on launches. i know its a truck, but i like to have fun with it also. thanks for the info though.

edit....sorry, i was going to ask you a question i remembered i asked previousely.

but, do you sell a electric fan kit for my truck? thanks.

 

Hi LBC150,

Thanks for your response!

Let me also apologize just in case I sounded negative in my response to that idea being used on the F-150. I have to confess it did strike me as odd at that moment.

It *is* a neat idea for improving the consistency of launching the vehicle at the drag strip. In fact, it's been used for years, racers use things like throttle stops, clutch stops, multi-stage rev limiters, etc. to aid launch & nail the tree with consistency, and in some cases, to actually slow the vehicle down a bit so they don't "break out."

If that is something you want to try at some point, give us a shout and we can discuss it. You'd want to do some experimenting with different launch rpms and on different surfaces. On the street, you're probably on asphalt more often than not, so perhaps that's the surface you'd want to get a good feel for the launch rpm on.

Ain't F-150 Online great? Something new every day, I love it!

Yes, we do have electric fan cooling setups available.

 

don't worry about it mike. your post was not negative, it was actually quite informative. you got me thinking about obviouse variables i overlooked.

i will give you a call when i get the chance to discuss some things i was thinking about with my truck. electric fan and whatnot. talk to you later. thanks again.

 

OK, thanks.

Have fun & we'll talk to you soon!