PhEnX

My Auto Rx7 seems to be a bit lagging out of the whole. I was wonder how your cars responde when u floor it from a stop. Or what you find the fastest way to leave a stop? My car has HKS intakes and HKS Dp but is otherwise stock. It has a **** load of power uptop but seems to be lacking from a dead stop.

Any input would be greatly appericated.

CantGoStraight

These cars lack bottom end torque from the git go. About the only way you'll improve the launch is with a higher stall torque converter. Have you used the hold button and tried power braking ? As rpm is your only hope.

silverflash2

iTrader: (2)

I know the feeling. Yep that's the problem with having a auto. I had an auto and swapped it for the 5 speed. 5 speed you can rev it up and go. With the auto even Power braking doesn't work, stall converter is what i heard that can help. I know it sucks, 5 speed is the way to go.

DarkLikePoe

Calling it like I sees it.

grimple1

iTrader: (1)

I dunno. I kinda like my auto tranny. It's only sluggish til about 3.5k rpms. After that it runs like a raged ape. Auto tranny means you're always in boost.

BUT to answer the posters original question: there are really only 2 things you can do to improve low end torque. 1) put in the 4.33 rear end gear 2)get a different stalled torque convertor. Most racing transmission ships can stall them to whatever rpms you require. NOW the question at that point would be how well does the auto tranny hold up to that type of abuse. I will say this: no one has put forth any effort to answer that question. Most just chump out and 5-speed swap.

RX794

From what I understand the FD auto and the 300ZX TT auto trannies are identical inside. Those 300ZX TT transmissions have been put to the test and can handle the power once upgraded, I don't know if anyone has bothered with the FD tranny BUT I assume it would stand up to the abuse once modded since it's the same.

grimple1

iTrader: (1)

if it's like the 300zx auto tranny, I think everyone needs to drop what they're doing and install an auto into their FD.

jeff p

get 4.33 gears and have the trans serviced with synthetic oil. or if you have the extra cash install a level 10 transmission upgrade.

Jeff

13Foxtrot

I wanted the best of both worlds, so I bought an Auto and I love it. Excellent for traffic and short trips. I really only have a DP and a custom K&N intake system on it right now and it will run like hell if you stab the throttle at the right times. I just came to accept the fact like the other guys were saying that it just doesn't have much from a dead stop. How do you like the 4.33 RZ gears by the way jeff_p? Does anyone have the website to Level 10? I've got a spare auto tranny that I was planning on building for an eventual mid-size single.

jeff p

Hey 13Foxtrot. the 4.33 gears are great. it made a big difference in the way the auto trans responds. if you have the extra money and trans I would get the level 10 upgrade I think its about $5,000 for the complete upgrade with valve job and converter. with this combo I and basic mods I think it will give any 5 speed a run for the money. the auto is not a dog like most people think . in stock form it can't handle over 325 hp but when upgraded it will be a very fast car.

Jeff

grimple1

iTrader: (1)

I don't think it's cost anywhere near 5k for the lvl10 stuff. Here's a link to their products. You would probably need to call them to see exactly what you would need depending on your CrankHP goals. My guess is that the PTS HYDROSYSTEM SERVICE would suffice most auto trans goals of under 500chp.

http://www.levelten.com/store/import...arts_mazda.htm


The 4.33 gears are great for down low but you loose top end (or trap speed). Again it all depends on what you are looking for but generally you want a 3.X gear for "drag" type events.


AND the auto at a drag strip is king.

93ttwankel

The auto's aren't all that bad. If you power brake it off the line it will take of pretty nice, but it will shorten tranny life by a lot. I can only think that the off line performance you are having trouble with is leaving a stoplight off idle? Yeah it sucks you could probably put the car in neutral and push it across the intersection faster. A higher stall converter won't help at all with the off idle take offs only allow it to reach a higher rpm while power braking. Go out put it in hold mode, shift it down into first, put your foot on the brake and try to push it through the floor now at the same time take your other foot and press the gas pedal until the tach reaches atleast 2600rpm remove foot from brake and continue pushing on the go pedal, don't do this for too long or too often the transmission will break. Stock stall is supposed to be 3000 rpm but I could never get mine above 2600, Even then it would spin a little, so I think 3000 would be overkill without really good tires. Repeated launching will break your transsmission, even stock rebuilds are expensive. Gears are the best bet to help get rid of that first couple seconds of not really going anywhere.

jeff p

I called on the bullet proof package and they quoted me $5,000 with shipping and labor. then you got to install it. so unless you can do it yourself its a little more most trans shops want $500.00 plus to R&R a trans in a FD. I called tripoint and they wanted $900.00 to R&R a trans in a FD ..(wtf)..

jeff

a3dcadman

iTrader: (1)

During the last few years, there have been some major technological advances with autos yielding major improvements in performance and reliability. A 5 or 6 speed auto conversion would be a better tranny upgrade if it could be done. That coupled with a 4.10 or 4.33 rear end would give the manuals a real run for their money.

The auto just doesnt provide the level of control offered by the manual tranny. I have to admit, it is nice to have full boost through each shift without having to take your foot out of the gas pedal and its a lot less agravating in rush hour traffic not having to deal with a clutch.

Give me a comparably sized 6 speed auto and $5000 plus another $500 - $900 to R&R and I would make it work in an FD.

-chuck

bajaman

Practice makes perfect but even then the initial 'launch' of an auto tranny FD is less than spectacular.
For all of half a second or so.
After that, it is Katie-bar-the-doors, ***** to the walls, unrelenting boost and pure acceleration.
Best thing is to acknowledge the limitations and embrace the superior elements.
Hell, these cars are not drag cars anyway, not even the 5-speed cars.
Problem is the lack of torque at low end that is inherent with the rotary, coupled with a torque converter that stalls at 3300 rpm or so...not anywhere CLOSE to the powerband. I can go and "powerbrake" my FD and all it does is go "guhhhhhh......guhhhhhhhhhh.......guhhhhhhhh", but if one just starts off normally, gets a bit of a roll and gets to 15 mph or more and THEN you tromp the **** out of it, it is amazing. Proper use of the 'hold' function makes things even more lively.

a3dcadman

iTrader: (1)

[QUOTE=bajaman;7433461
Best thing is to acknowledge the limitations and embrace the superior elements.

Problem is the lack of torque at low end that is inherent with the rotary....... not anywhere CLOSE to the powerband.

but if one just starts off normally, gets a bit of a roll and gets to 15 mph or more and THEN you tromp the **** out of it, it is amazing.
[/QUOTE]

bajaman,
You hit it right on the head!

For anyone that wants more performance from their auto FDs, the 4.1 rear differential is an easy switch-over and yields some definitive acceleration gains and better uses the engines power band.

It just would be soooo nice to have at least one more gear with shift points strategically placed thoughout a five gear spread.

chuck