4T60E shift points..

[xtremerevolution]

So I read up on a thread in here about shift points on the LQ1 and how shitty they are at 6200-6400 from 1-2. My L27 shifts from 1-2 at 5400-5500 RPM. Would I stand to gain anything by raising the shift points with the L27? Does the L27 make much power past the 5500 RPM?

 

I know the L27 isn't a great engine to tune and I rarely ever hear of one getting into the mid 15's, but I'd still like to have a little fun till I get a new car next summer. Would it be a good idea to raise redline and shift points to 6000?

[slick]

The good thing about the higher shift points is that it sets you a bit higher into the powerband in the next gear. Too high, however, and you'll slow yourself down.

 

I don't really know the powerband of the L27, but i'd guess and say that 5750-5800 would be the max I'd go.

[xtremerevolution]

The good thing about the higher shift points is that it sets you a bit higher into the powerband in the next gear. Too high, however, and you'll slow yourself down.

 

I don't really know the powerband of the L27, but i'd guess and say that 5750-5800 would be the max I'd go.

 

That's what I was thinking as well in regard to your max suggestion. Would you suggest I get a dyno before considering raising my shift points?

[mfewtrail]

Shift points should be fine as-is. L27's were rated for peak power at 4800rpms, so you don't want to shift at an rpm that is much higher than that. The stock tachometers are not the most accurate. Get a scan tool hooked up and you'll probably find that your car shifts lower than indicated.

[chadz34]

Shift points should be fine as-is. L27's were rated for peak power at 4800rpms, so you don't want to shift at an rpm that is much higher than that. The stock tachometers are not the most accurate. Get a scan tool hooked up and you'll probably find that your car shifts lower than indicated.

x2 I found out the tach can be up to 200-300 rpm off. I would nto go anywhere past 5,800rpm on that motor, you just waste gas and will lose power revving that high.

[xtremerevolution]

Shift points should be fine as-is. L27's were rated for peak power at 4800rpms, so you don't want to shift at an rpm that is much higher than that. The stock tachometers are not the most accurate. Get a scan tool hooked up and you'll probably find that your car shifts lower than indicated.

x2 I found out the tach can be up to 200-300 rpm off. I would nto go anywhere past 5,800rpm on that motor, you just waste gas and will lose power revving that high.

 

Good call. Would it be worth it taking it up to 5800 RPM though? Or would I be better off just leaving it stock...

[digitaloutsider]

There's no power up there at all. Leave it stock.

[MonteCarloDude]

There's no power up there at all. Leave it stock.

argeed, i do not know a hell of a lot about the L27, but i do know they make next to no power up top. my old SL2 walked the hell out of my borthers L27 from a roll.

[BIGBULS]

To get the shifts dead-on, you will need a full dyno chart from low rpm (at least go down to 3000rpm) up to the rev limiter in one gear.............2nd gear works best.

 

Then do another pull in "D" so we can see how the trans REACTS off of the shifts............in other words, how much rpm SLIP does the torque convertor allow during shifts, and what rpm are you sitting at AFTER the shift is completed.

 

Then we can get close, but even after THAT you'll want to do a little testing to double-check things.

 

 

 

 

 

But........

 

As stated by others, I doubt there is any benefit to going past 5800rpm or so, and it may be best to not even get THAT high.........again...........a dyno chart will erase any and all questions.

[xtremerevolution]

Then onto a new question.

 

Where the heck would I get a dyno chart of my car in Chicago, and how much will it cost me?

[Chancho]

just take yor car in to get dynoed, any most tuning shops have dynos, especially import turbo shops, look for one that advertises a company that manufactures dynos like dynojet around the chicago area, there is bound to be atleast one shop i know around here in fl they charge <$200

[xtremerevolution]

just take yor car in to get dynoed, any most tuning shops have dynos, especially import turbo shops, look for one that advertises a company that manufactures dynos like dynojet around the chicago area, there is bound to be atleast one shop i know around here in fl they charge <$200

 

I'll look for a "dyno day" deal somewhere because $200 is hard to swallow for a piece of paper showing how much power you put out.

[mfewtrail]

I drove a L27 powered Regal sedan tonight and let it shift on it's on w/ the selector in 3rd. It shifted from 1st to 2nd @ an indicated 5500rpms. I didn't pay enough attention to see how far the rpms dropped down on the shift(s) as I randomly stomped the car leaving the last intersection in town. If I think about it, I'll scan the car soon to see where it actually shifts.

 

On a side note, it felt about like it would click off low 16's this evening. I calculated density altitude right after driving it and it was negative 613ft here...no wonder everything I drove felt stronger this evening.