I just noticed this last night since I had my windows open.....I was about 2/3 to 3/4 throttle from 1st to 2nd and 2nd to 3rd..........and when the truck bangs into the next gear, I get this sound that resembles a turbo's blow-off valve!! I think it sounds badass!!! But now I'm also wondering if it's something "unhealthy" also?? Anyone else here have that??

Background info: I have the boost bypass unplugged, and I just got my chip installed also!

JC

 

ttt.....

 

Does it make the sound only at around 1/2 throttle? No noise at 1/4 or WOT? If it does my 2000 L has done it since day 1. It's kind of annoying since the dealer can repo it but they don't know what it is. All Lightnings do not make that noise. They let me drive a 2002 and I couldn't make it make any noise. Let me know here if you can find out what it is. I'm just afriad that it may be a bad noise (i.e., loose cam chain) and would like to have it stopped.

 

Yea, its normal like Redshift said.

 

There are several things that it could be.

I have never heard this from a chiped truck with torque reduction turned off on the chip. This feature may include dumping the boost at the shift but I have never found proof that Ford did this.

If you do the boost control valve trick, The sound seems less but not gone.

The blower belt is known to slip and make a weard noise at the shift. I here the belt Ford now selles has more silicone on the back

Hope this helps

Andy

 

You can force it to happen, just run it hard to about 4800 and let of the fun pedal real quick. It will dump all that air(even with the boost bypass)

Q