HPP3 Experts help !

Reply Subscribe

Thread Tools

Search this Thread

Dec 28, 2002 | 07:45 PM

UGOT8

Thread Starter

TECH Enthusiast

Joined: Nov 2002

Posts: 590

Likes: 0

From: San Diego, CA

HPP3 Experts help !

I have a 98 Trans Am -- I am expecting my HPP3 in the mail the next few days to reprogram my computer for my new 3.73 gears.

I was wondering -- since I have it -- what should I tune with it. My mods are minimum. Whisper Ram Air, Lid, exhuast cutout, 3.73.

Its shifting at 4500 now -- what shiftpoints?

Car is Automatic 4spd.

thanks.

::austin::

Dec 28, 2002 | 08:10 PM

1/4master

Launching!

Joined: Feb 2002

Posts: 254

Likes: 0

From: From Houston, Stationed in Norfolk

Re: HPP3 Experts help !

your bolton mods are probably just at the point where HHP3 power tuning will hurt you vice help you. as far as shift points go, everyone is different (i know that helps a lot . . . sorry). i had mine at +4 +4 +1 before the PI3200 w/ 3.42's. the 3-4 shift isn't going to gain you too much. it's the 1-2 and 2-3 that have the most impact. it's really trial and error to find what you need. ideally, you want to shift 100-150 (i'm pretty sure) RPM's above peak. i could be wrong about that number. i'll bet you some of the more experienced tech guru's can help out. you can stiffen up your shifting too, however this is done electronically, and when you're WOT, your PCM sets the firmness of the line pressure to max anyway. the coolant temp, rev limiter, tire size, and gear ratio are extremely helpful, as you know. 3.73's will be fun. oh yeah, when you program, it'll automatically clear the SES light if you're throwing a code and you don't have ATAP. hope that helps. sorry so long. posted the same thing myself some time ago. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

john

Dec 28, 2002 | 08:20 PM

1/4master

Launching!

Joined: Feb 2002

Posts: 254

Likes: 0

From: From Houston, Stationed in Norfolk

Re: HPP3 Experts help !

do a search on shift points. you'll get more info than you can shake a stick at. <img border="0" title="" alt="[Razz]" src="gr_images/icons/tongue.gif" />

Dec 28, 2002 | 11:00 PM

UGOT8

Thread Starter

TECH Enthusiast

Joined: Nov 2002

Posts: 590

Likes: 0

From: San Diego, CA

Re: HPP3 Experts help !

thanks a lot man.

very much appreciated ! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> <img border="0" alt="[chug]" title="" src="graemlins/gr_chug.gif" />

Dec 31, 2002 | 04:08 PM

fla00z28

Staging Lane

Joined: Nov 2002

Posts: 50

Likes: 0

From: St petersburg Fl

Re: HPP3 Experts help !

I have the same shift problem with my car as you do. I was told that there is a speed sensor on the axle. Since you have changed the gear, the computer thinks that the car is moving faster than it really is. The programmer will not fix that unfortunatly. Your best bet is to shift manually when you are running hard. if you haven't done them, do the free mods. My car currently runs a best of 13.1 at 107 traction limited so you should be a bit better. I had to bring down my 2-3 shift point because the tranny didn't want to shift at the top of 2nd. Also raise your rev limiter to 6500 or 6600. I think that is it

Jan 1, 2003 | 10:42 AM

XFiveLiter

TECH Resident

Joined: Feb 2002

Posts: 992

Likes: 0

From: Schererville, IN

Re: HPP3 Experts help !

The shift points are based on MPH. Correct the speedometer w/the Hypertech and make some runs and see when the shifts happen (should be pretty close to what they were stock). Then adjust shift points and rev limiter as desired. For stock internal cars anything over 6200 is overkill IMO.

PS: Shifting manually is unecessary and may shorten tranny life. Just get the shift points right and let the computer do the shifting.

Feb 5, 2003 | 09:00 AM

eallanboggs

TECH Addict

iTrader: (1)

Joined: Mar 2002

Posts: 2,080

Likes: 1

From: New Orleans

Re: HPP3 Experts help !

This is 2003. Why would anyone buy HPPIII these days? Havn't you heard of LS1Edit or Predator, etc.? HPPIII is stone age science compared to the new stuff and it's way overpriced compared to Edit for what is does. I bought one 4 years ago when it was the new kid on the block, but by now it's past its' prime.