Hmmm



http://forums.maxima.org/all-motor/5...utomatics.html

 

I'll try to get some video of the stock stall speed for you.

 

I can post my logs when I get home. It will show speed vs RPM and of course time. Quantitative.

Maybe even take some more logs.

 

Yep KingJames has one of those. It is very useful when I'm tuning his car because he can floor it at any RPM without downshifting automatically. I'd imagine it's also very useful on the dyno for that same purpose.

VB shift kit + SSV4 + TC should make an auto maxima feel and act like a whole different animal.

 

A 5th gear would be nice too, along with limited slip.

 

btw sparks, did you guys ever went to the track on the 18th??? what were the times???

 

My transmission broke on the night of the 17th. Nobody ended up going because Steven and I talked them out of it since it was some car show/ricer day.

When I get new times I'll certainly post them up.

 

Logs as promised:


RPM vs Speed from coil & VSS:


7182 48
7219 49
6572 50
5596 51
4670 53
4363 52
4553 53
4499 53
4614 54
4629 55
4681 55
4718 56
4766 56
4827 57
4860 58
4906 58
4953 59
5006 59
5054 60
5104 60
5141 61
5212 61
5225 62
5278 62
5325 63
5373 64
5415 64
5457 65
5507 65
5551 66
5588 66
5641 67
5672 67
5718 68
5750 69
5806 69
5846 70
5879 70
5912 71
5963 71
6014 72
6040 72
6076 72
6111 73
6147 74
6183 74
6239 75
6276 75
6324 76
6343 76
6372 76
6411 77
6451 78
6481 78
6521 78
6562 79
6583 79
6624 80
6667 80
6688 80
6731 81
6775 81
6797 82
6819 82
6864 83
6886 83
6909 84
6944 84
6990 84
7013 85
7037 85
7085 85
7097 86
7133 86
7170 87
7194 87
7219 87
7244 87
7270 88
7257 88
6531 90
5278 90
4827 89
4935 90
4941 90
4929 91
4982 91
4976 91
4994 91
5012 91
5030 92
5030 92
5061 92
5073 92
5091 93
5104 93
5123 93
5129 94
4872 93
4816 93
4723 93
4609 93

 

After looking at that log, I'd wager that you would see gains if you could get more shift extension out of a looser converter.

Looks like it shifts down to around 43-4400 into 2nd, then 4800 into 3rd.

 

Yep imagine if it was @6500 like stock

 

Haha yeah, and IMO that's why even a stock car would see gains

 

Ideally, you'd want to land in the middle of the torque peak on shifts. I'd say on a stock or mostly stock vehicle, 4300-4600 would be about right. 5000-5500 for one that is modified and has an extended rev limiter.

 

No, ideally you want the highest average HP through out the gear. If you can shift into it at a RPM where there is a higher HP number, then you raise the average power throughout the gear, and thus improve total acceleration.

Rather than look at torque peak, you want to look at your horsepower curve and gear spacing and stay as close to your peak HP as long as you can.

 

Really don't want a CVT....

 

Yeah if you look at the vid of that truck that you posted (it's a silverado SS), it kinda hangs at 5200 rpms for about half of each gear and I guess that would remind you of a CVT. However, it kicks ***!

 

Then why are CVT equipped cars usually slower than their manual or traditional automatic counterparts?

 

Drivetrain loss.

 

Have you not seen the 7th gen cats breaking 13's? ZOMGZ!!!!111one

 

They don't seem to launch well either.

 

Yeah that too... I've seen a 6th gen CVT launch and it's not exactly awe inspiring. These CVTs obviously weren't made with performance as the main goal.

Technically, a CVT could be more effective than an automatic if they could hold and transmit the same power as an equal automatic, especially on peaky engines.

I bet you could see good numbers from a 6th/7th gen CVT in a very lightweight car (B15, along those lines) since it would hold a lot more power and would easily launch such a light car.

 

Torque converter + CVT =

 

Torque multiplication for the launch + lockup at peak power seems like a recipe for win. WTB better CVT technology

I can tell you guys this for certain: My fast car is going to have a 3-speed automatic. Auto FTW in a high power car.

 

My Chevelle only had a 3 speed TH350. 4.11s + 4000 stall and you don't need a lot of gears.

 

Yep going to be a TH400 with a transbrake and 3600ish stall. Going with a lower stall since it'll be on nitrous then boost eventually and won't need the extra RPMs. My rear end ratio will have to be low enough to hit 200! haha... (eventual mile goal)

 

You guys are old school, but things have changed with the transaxle.. to the both of you.

Get to your rooms!

 

Hey most of the fastest drag cars in the world, including the 2 fastest 350Zs in the world use turbo hydramatic variants. Powerglide, TH350, TH400...

They may be old school, but the old school is still kicking ***.

 

Do you know Jime? You always sorta hop around him and his posts..

.. As Jime once said, if you wanted to be faster, you'd be automatic.

 

Yeah I'm not ready for the headache of these autos in a heavy car. They seem to do great in Jime's and Aaron's cars, but in the 5th gens I don't see many happy campers.

 

Jime had an 02 as a lease .. not sure if you knew that. ... The 02 is about 225lbs heavier than his A32 ... is that significant?

 

My car race weight is around 3350 (me in car). I know aaron and jim are well below 3000.

I'm sure I could get that down to 3100 or so, but it's my daily and will never be stripped like that. That's what the RX-7 is for, lol

 

WHy the fark are we arguing again?

Refresh my 29 y/o memory?

 

I said that I was not interested in messing with one of our crappy autos in my car because it's a good bit heavier than the cars they seem to do well in. Seems like the 5th gen auto guys tend to have a lot of trouble if they try to race with them.

 

And my dipshat asz was trying to defend said heavy auto's.

 

I mean I was hitting 2.1 60 foots on my auto. stalling to 2500.................. on 19" rims lol

 

What is that supposed to mean exactly?

 

Level10 builds are supposed to be really good.

I don't race my car at the strip (someday, hopefully) but 175,080 miles on the original transmission and I don't exactly baby my car.

Our cars aren't that heavy, 3224 pounds is the listed curb weight for an SE with the 4AT. That's only 80 pounds more than a Z06 Corvette. Also explains why our cars are like driving a kite in strong cross winds.

 

^ Try driving a 7th gen Celica on the highway on a windy day. 2,400 lbs + strong cross winds = new shorts required.

Back on topic, Level10 builds? I'll have to look that up...

 

I dunno. Im sorry.

 

Yeah 2 things. Have you looked at the price of a level 10 trans? Yeah screw that I'll stick with the "cheap" 6-speed, lol.

I mean heavy compared to the cars that run so well with these 4ATs... IE 2600-2700lbs.

My car without me in it and 1/4 tank full interior weighed in at 3080 last time I weighed it.

 

Unfortunately, import transmissions are still expensive to build. So little demand compared to something like a TH350, Powerglide or 700R. If you buy the Level10 rebuild kit you can save a lot of money assuming you can tear down a transmission and put it back together right.

The biggest problem with the 4AT is the long 3rd gear. I'm in it from 72 to around 115 with 6500 shift points.