Originally posted by Import-Slaya@January 28, 2006, 7:19 AM
Reflashing to get the throttle blades to close is easier said than done on the throttle by wire system. So far, from two different tuners, I haven't been able to achieve it.
Quoted post

You're kinda right here. Where the actual problem lie's is that the 05-06 Mustangs with Drive-By-Wire doesn't have an Idle air controll valve anymore. So it uses the throttle plate and a HIGHLY researched table to create the dashpot affect for the TB. When you install a larger sized TB you increase the amount of airflow not only while under throttle loads but also when you are of the throttle and trying to slow the engine down.

I have the LFP 62mm TB, that by the way looks exactly the same. Now, with an automatic like mine I've not found this to be a problem at all but I'm assuming the additional load from the transmission is aiding in slowing the engine. With a 5-speed In slowing down situations or depressing the clutch I can definatly see the issue.

An even worse situation is with a Supercharged car, you are not only forcing more air but simply moving more air at idle because the supercharger maynot be pressurizing it at idle but it is working like a $5000 air intake and aiding in getting some air to the engine. I've seen a Vortech S/C car run great under loads but when coming to a stop or even between shifts it goes to 3000 rpm's and stays for a while.

The fix, yes, custom tuning can help to solve this problem and it can be fixed entirly by doing this. Don't worry about dynotime because it's going to be done on the street with a datalogger. No true dynotime needed. It will be a slow process but it can be tuned out and made to perform like a stocker under closed throttle situations.

And as for the slowing effect of the engine with the stock TB, I have a tune that is ALOT better for that with the manual cars. I do it to every manual program I do. It's actually one of the top requests I get from you guys.

Thanks, Doug.