Hi guys,

I'm planning on getting a L in the spring and I am doing my research on them. I've searched on the boost bypass and read alot of post about it. I do have a couple of questions that didn't seem to be answered anywhere.

1) According to this site http://www.rpmoutlet.com/boost%20bypass.htm "When acceleration exceeds factory limits, the boost actuator solenoid actuates the boost dump valve, relieving the superchargers pressure until the truck is shut down and restarted". Why does the boost dump valve stay actuated until the truck is shutdown and then restarted? Why doesn't it close after it is deemed safe to do so?

2) The same site also states: "Under normal engine operating condition vacuum is supplied to the bypass valve. The valve opens, diverting excess airflow back into the air plenum. This prevents the supercharger form “cavitating.”
Cavitating causes reduced performance, increased temperature, and poor fuel economy. " I'm not sure what is meant by "Normal engine operating condition" but I'm assuming that it is anything other than WOT. Even so, this statement makes it sound like the Boost Bypass Mod does more to hurt your engine, performance, and gas mileage unless you are at WOT. So most of the time it is working against you. Is this true?

3) Has anybody had any problems where they can claim the boost bypass mod was the root cause? How many miles have yall clocked on a stock block with this mod?

 

10+k miles without a problem for me since febuary including a 3k road trip. Do it.....make your own it'll cost you like 5bucks.

Josh

 

Mine was free. I just unplugged the damn thing.

 

Me too. No codes, no problems, right price.

 

Hey guys,

I just found this... http://www.timskelton.com/lightning/..._reduction.htm . Just thought yall might want to look at it. I had to read the entire page to understand it all, but this seemed vital.

"From transmission guru Gregg Evans (AKA "Factory Tech"):
Almost every chipped truck I build a tranny for has moderate to severe damage in the intermediate clutch. I've had a few people who have come up and had me build their tranny while they waited (it is kinda cool to see) and to a man they've all been horrified at what second gear plates looked like and they never even noticed, it happens gradually, but it does happen.

In a later post, Gregg elaborates:

[T]orque reduction . . . was very specifically put into the strategy to protect the intermediate clutch, and if you disable it, your intermediate clutch will die after a given amount of times it slams into second gear at WOT without it. The plates just won't take the torque, I've seen many many times how it damages them. I'm willing to bet a Chocolate Milkshake that if you take 5 chipped trucks with Torque Reduction disabled and 5 unchipped trucks, drive them 10K miles each and bring me the intermediate clutch plates from them, I can tell you which ones came out of which trucks.
"

I know he is talking about chipped trucks, but he is really talking about disabling the torque reduction. But it sounds like the Boost Bypass is part of that.

 

Torque reduction and boost bypass are two completely different things. During upshift(especially from 1-2)...there is the slightest bit of hesitation, and a fart. This is caused by two separate safety features built into the lightnings. The first is the torque reduction which basically cuts fuel for a split second and saves ur trannys ***...I would say this is the more important of the two...if u really really care about ur tranny leave this one activated...the other is boost bypass which dumps boost and keeps it closer to about 8psi. On cooler days with the bypass mod done, it will, without hesitation rise to 11 psi on a stock truck and stay there. It is okay for the tranny. Most people have put tens of thousands of miles on there trucks with it. Ive put several thousands myself, and going strong. No known problems for anyone ive heard of. I say just do it...dont worry about it...there are many mods out there that are much worse than this...this should be the least of ur worries.

 

Nope...torque reduction at shift and the boost bypass are not related at all.

The boost bypass is a protection device to limit horsepower during an over rev and their are other things that will bring it into play. I think if the transmission overheats it will turn it on.

Torque reduction limits torque during a shift by shutting off several cylinders for a moment to take pressure off the transmission.
Dale

PS looks like I was about 3 minutes late

 

Thanks guys...

You're right, I understand now. However, does anybody have any thoughts on the 1st and 2nd questions I asked up top?

 

I have a '00 model so all I know is how the truck acted for that model year. When I used to have my boost bypass hooked up and working, if I remember right it would activate and shut down the boost only for something like 30 to 45 seconds and then it would begin to function normal again. I didn't have to shut off the engine and retart.

Also the boost bypass mod does not stop the boost bypass from working, it just stops it from working when the factory wanted it too. The boost bypass mod disables the safety funtions of the boost bypass only. So you don't have to worry about it kicking on during a nice burn out.
Dale