3800 3-1 skip shift???

[zeez gtp]

Man, help me out. ok, theoretically, if i have the shifter in 3rd and punch it with perf on, i should always get the 3-1 skip shift. right? i have only gotten them a couple of times. most of the time, my car just pulls hard in the gear i'm in. i always get the 4-2 skipt shift. i mean, i will be doing about 45 so it's not like i am just starting to accelerate and punching it and wanting the skip shift to come into affect. i don't know, am i missing something here

zack

Click to read more...

 

[Fish]

Thats what should happen I believe. If you move it from drive to 3rd, then you would shift down, then go WOT with the PS you should get it. If your going fast enough to be in forth though, I dont think that would be good for the tranny.

 

[BumpinGTP]

keep in mind that around 50 is your shift point, so you might be going too fast, go 36-39 and try it

 

[imported_GraFFix]

I believe the DHP is set so that if you are going 40mph+ even in 3rd gear you will not get the skipshift.

Like Bumpin said roll at 35-39 and hit it and youll get it everytime...as long as the tranny can take the abuse..it is hard on the trans and the imput shaft.

 

[beyerch]

bumpin and graffix are correct.

The purpose of the 3 - 1 shift is to get you in the power band more quickly. However you do not want to just skip down twice regardless of your speed to give you an idea of what i mean here's a quick breakdown of MPH vs RPM for 1st gear....

MPH RPM
60 7,000
50 6,000
45 5,200
40 4,600
35 4,000
30 3,600

So what this means is that if you're cruising in 3rd gear and you bury the accelerator at 50 MPH AND you had an unlimited 3 - 1 skip shift, you'd drop into 1st gear at 6,000 RPM. This is obviously useless as you are #1 out of your power band, #2 that is the 1-2 upshift point anyway so you'd immediately shift back into 2nd.

However, if you hit it at say 40 mph, you hit 1st gear at 4,600 rpm, a decent spot, and that allows you to pull hard than if you hit 2nd gear at 40 mph which would be .... 2400 rpm. This is one of the reasons our cars have a 40 mph lag......

Charles

 

[zeez gtp]

awesome, thanks alot. ya, i wasn't trying to do 3-1 skip shifts while doing 70 or something. i think i was just a bit high on the mph to get them to work. now i understand. thanks again

zack

 

[imported_GraFFix]

hehe...Skipshifts at 70mph would rock!

Although not to good on the wallet...

Thanks for the explaination Charles.