94-95 3.4 DOHC Chips

[GOT2B GM]

The 2nd gear start is just 1 wire that needs to be grounded in order for it to be activated. I don't know what pin it is off the top of my head, but I can ask someone that knows next time I see him online.

Ok Thanks. I would really appreciate that. Maybe you could PM me when you find out.

[Prospeeder]

what is so great about second gear start? is it bad for ur tranny? why dont they use it anymore?

[slick]

what is so great about second gear start? is it bad for ur tranny? why dont they use it anymore?

Mainly its good for icy/poor road conditions to get better traction. It *possibly* could be bad if you are starting out in 2nd gear all the time, but the occasional start isn't bad.

[BIGBULS]

I do remember that page and will be looking at it once I am able to do shift points.

Just some FYI if you have a hard time finding that thread again, it's the "3.4 5 speed video" thread, and the shiftpoint discussion gets started on page 2.

Just to help you search

[Vegeta]

Thanks, that will make it real easy to go ahead and bookmark.

2nd gear start grew up wanting to be the performance shift button:P

[Canada]

I think they also dropped it because of the 'lack of power' complaints.......people just don't know enough about their own cars.

[5speedz34]

What exactly does the performance shift do?

[Aaron]

Tony you have a 5-speed...

It raies the shift points and I think makes them shift faster and harder. At leastthat is what it does in the GTPs

[sl3196]

It raies the shift points and I think makes them shift faster and harder. At leastthat is what it does in the GTPs

Only raises the shift points with an aftermarket pcm. Stock it doesn't change the shift points. What it does is shift down with less throttle when in p.s. mode. So more responsive.

[Canada]

sl3196 is right (as he owns one)......it does NOT change WOT shifts....only downshifts sooner.....which is about as worthwhile as the tits on BIGBULS.

[sl3196]

sl3196 is right (as he owns one)......it does NOT change WOT shifts....only downshifts sooner.....which is about as worthwhile as the tits on BIGBULS.

Pretty much. Doesn't do much with a stock pcm.

[Vegeta]

Um, the button can be used for many things. Downshift is useful for response. Try going 1/4 throttle in overdrive and it doesn't kick out. I should be able to make it downshift for better power at part throttle, change WOT shift points, and if the computer allows it, 3-1 and 4-2 downshifts. I could make it stupid shift button as well and keep it in 3rd all the time almost:P

On the 91-93, I changed the spark retard for shift time and that seems to have helped the shift time. Messing with the vacuum modulator will definetly have an impact on how fast it shifts though.

[Aaron]

Hahaha, I WAS RIGHT:

change WOT shift points

But I did compare it to the L67s, but I wasn't referring to them, just saying liek what they do, as I thought they did.

Sweet, but autos still suck

[Canada]

http://www.w-body.com/forum/viewtopi...hlight=bigbuls

That's the actual link to the thread that BIGBULS was talking about.

It IS the "3.4 5 speed video" thread, but I actually had a FAR easier time searching for it by searching in the "General" section and typing "BIGBULS" (I probably should have just asked him, but he was at work).

And as he said....page 2 is where shiftpoint discussion starts........



Just remember.......very few dyno runs exist of close to stock 3.4 DOHC's (hell...very few total...modded OR stock), so it would probably actually be better to do the shiftpoint stuff by dynoing the test car itself and going from there.

This way, you can tailor the shifting to take advantage of the extra top end that I understand your chip adds.

Either way though..........the shiftpoint thread does make some good points.

Just remember to check what rpm the tach drops to OFF of the shift..........the 4T60-E gives the torque convertor a LOT of leway to slip and allow artificially high rpm (I seem to recall it slips something like 800rpm off of the 1-2 shift for the LQ1's).

[Vegeta]

I can monitor the total slippage with this program though its a seperate file than what I use for fuel tuning. If I can find a dyno nearby, i will be going that route. I have my doubts about making a lot more power on this chip cause its already rated 10 hp more than the 91-93 auto. It sems to have more power than the 91-93 do anyway. Wait and see I guess.