Every auto owner knows of our dead spot in acceleration aroun 3000rpm when we floor it from a stop, even more somehow if we have an intake. I want to find a way around this. ?Did anybody find out anything yet??? I know when i installed a new MAF sensor and resetted ecu, i had absolutely NO dead spot, if i would floor it, my 17s would burn out all of first gear(bad tires) with NO dead spot. The next day it was back to that damn dead spot we all hate i dont know what it might be, maybe the coil packs, but i have come across this http://www.coximport.com/venom/400.html
I already have a techno ecu(Which i want to sell cause i am going nitrous) and i called up and they said that the venom400 could be used along with an upgraded ECU

<EDIT: this thread is not 4 me 2 sell, pm me about ecu thanx http://forums.maxima.org/showthread.php?t=306373 >

 

You've got a PM.

 

how much for the ecu?

 

What is this Dead spot? I have never noticed that. My cars pulls hard all way up to 5000 before shifting into the next gear when i have it floored.

 

the only "dead spot" I have is when my auto tranny computer is taking it's time deciding whether or not it wants to downshift. it doesn't do this every time, though... depends what rpm I'm at when I floor it. you just have to get a feel for it.

aside from that, the acceleration is pretty smooth all the way to just above 5k... I don't think there's any "dead spot" in the powerband before that?

 

the only dead stop that every auto has is in the 3rd gear...every auto has it... when you go through 1st & 2nd gear and are in the 3rd gear, accelerating with "O/D OFF" you will see that once it gets up to 3200 rpm's it will drop back to 3000 rpm's... the only solution that works & I know of is to click the O/D button to the "ON" position... even when the car is in 3rd gear but with o/d on, the dead stop is not there... try and if you don't believe me...

Sam

 

mmmmk, I'll have to try that today and see what you mean...

I usually just keep O/D on, retarded GXE speed limiter (118mph) cuts fuel before I can wind out 3rd anyway, so there's no reason to keep it off to get that extra few seconds before the shift to O/D.

 

I was under the impression that the "dead spot" was due to the knock sensor retarding the timing due to low octane fuel... and it's only apparent when you're at partial throttle.

Hmm.. maybe we're talking about different things...

 

I with you. That is the most annoying thing about my A/T. I wants to come to a complete stop in order to down shift.

As far as the dead spot while in third gear, I have never felt it. But I will look for it on my way home. Hopefully there won't be a police for the first part of my ride.

 

You guys will feel it if you keep it in 3rd when accelerating onto a highway from an onramp. You don't feel it when you floor it but you feel it when accelerate gradually up to speed.

 

I know that feel on third gear also...but i am talking about from a complete stop if i floor it tires will spin up until around 3rpms then stop a split second to catch the tires i guess, then accelerate normally.

 

There is no dead spot in autos. As much as they suck the dead spot is probably cause by a bad KS. Before you come here and announce this make sure you're right. Only dead spot I can think of besides the KS is when we pull up to a light and the POS doesn't feel like downshifting down to 1st unless we make a complete stop. That really ****es me off. There is a dead spot at around 2krpm due to this.

 

its not a dead spot persay, its just a lack of downshifting

 

I guess. It just really is annoying. You have to stay in 3rd or 4th going 15mph unless you floor it and then it downshifts. For god's sake the rental cavalier I had for the past week automatically downshifted when I touched the gas pedal while under 10 or 15mph.

 

i hear ya, i was driving a mazda3 the other day and compared to my bro's auto max, the mazda3 was so much more fun to drive even tho it was slower, the trans really was nice, not to smooth really, but it shifted well. no need to mash on the gas to get it to downshift

 

If you look at dynos for a 95-99 max, aut ot stick. You will see htere is a power drop between 3000-4000rpm's. You feel this more in an auto because the gears are longer.

 

kevlo, that doesn't explain why the RPM's drop.

I have experienced this several times but not after accelerating after every light. I know its not the KS because I'm advancing 24 degrees. Tyrexx pointed this out to me one day. I had never noticed before he mentioned it and since then have only noticed it once. Yes, I did have the OD off at that point so MaxedOutOfCash's theory is correct although I don't know why. It seems that this would be reverse. The dead spot seems that it would be the shift from 3rd to 4th but it isn't. Very odd. Is it possible that this is occuring during 1/4 mile racing at other RPM points in other gears. I say this because I ran my fastest time with my OD on. Wierd. You guys act like there is absolutely no way to make it downshift. Yes, there is. With your hand. I downshift almost everday to help jumping into traffic and my tranny is still moving along.

 

From what the "more knowing" SR members say here downshifting manually is bad for the tranny. If you downshift from 3rd or 4th to 1st don't you have to go through all the other gears first? I guess it's different than if the TCM does it, the TCM just goes straight to 1st without going 3>2>1. Maybe not.

 

I get the same dead spot, at 3200 rpm's it stops for a split second when accelerating gradually, although it doesnt drop back down to 3000, it just sounds like it hesitates for a fraction of a second.

 

i have a dead spot when accelerating from a rolling stop. the car will kinda rev to 2 grand and then go. i don't know if it's because of my KS or the tranny...and i don't know how it can be the KS since i bypassed it. wierd stuff with these cars.

 

The 2k rpm thing is because you're in 3rd gear and the tranny is too retarded too downshift. Unfortunatley that's normal.

 

wow, never realized that. i guess just slow computing time. the more i drive this the more i wish it was a 5 speed. oh well, guess it's something i'll have to live with.

 

I'm not quite understanding you here. First, who are these more knowing SR members? Second, the TCM will not execute the shift if its bad for the tranny. I'm not sure what you talking about not being able to skip gears. Yes, it is possible. In auto and 5Spd. You are correct that downshifting all the way to 1st from 4th will skip all other gears. It would take extra time to do that and in this situation the TCM "knows" that your in a hurry and doesn't want to waste precious half seconds.

 

If Im slowing down and Maxeene decides she wants to chill in 3rd or 4th, I simply tap the throttle a few times. This usaully does the trick for me although most of the times she'll go into second. She's so scarred of 1st for some reason.

And to the comment on manual shifting. Not that it matters, but I personally have been doing the manual shift things since about 50k miles. 150k miles later and I've no problems.

 

Thank you Capitone. Nothing is better proof than real life accounts.

 

No Prob. Just speaking my piece, but please keep in mind, that even when I do shift, Im
1. Not Redlining up the RPM band on every shift
2. Am at a point now where I know when to up and down shift, so the tranny isn't slamming into the next gear. Now that sort of shifting I can see as being detrimental to tranny life…..although sometimes the automatic will do the same thing when let it shift on it's own. But that’s Usually when your doing some hectic stop and go at higher speeds.


My 2 cents….again.
Have a good weekend everybody!

Capitone

 

I forgot about this thread....
bump.......anyone fixed this yet?

 

i noticed in an earlier post someone said it's because of the longer shifts - would a vb mod help fix the problem????

 

Nope sorry... Eventhough I have only had my VB in for 2 days, this is the first thing I noticed when I took her for a test drive. The damn 3rd gear crap is still present. I guess it's just something we'll just have to live with

Lata,
drew

 

If you simply anticipate a need to accelerate quickly you can turn off the O/D and be in third. Or you can grab the gear selector and toss it in second or first. I don't consider this to be the downfall of our trannies. Its downfall is the open diff., extremely tall first gear, and its stutter at 3K.

 

if your complaing about your auto tranny maybe you should have bought a 5 speed.

i drive a stock max about once a week and it always downshifts fine if i ever step on it.

or just use your hand.!! wakkwakwakwakaka

 

My 5Spd is sitting in my living room so I'll just but out of auto bashing threads from this point on unless I feel the need to look back and remember how terrible it was.

 

read the whole thread....the point isn't downshifting ...it's an rpm drop above 3000rpm's....

back on topic:
once you keep it in O/D and drive in 3rd it is fine... but most of the time my o/d is off around the city...

 

so is there anything that can be done to make an auto tranny quicker in response without damaging the tranny? cuz im getting bored with my automatic...

 

ummm....if you want quicker response....i suggest getting the VB Mod....

 

VB is the expensive way and nobody has really proved that DR is harmful. Unplug the dropping resistor for the day and see how you like it.

 

hahaha...unplug the DR??? That's the last thing you want to do...
do some research my friend...

 

wow, brought up from the graveyard...well i tried doing some research and the downshifts r controlled by the solenoid pack(as well as other shifts)...some one on the org replaced it and he said downshift lag went away. I drive a 3rd gen auto and absolutely no lag at all.I was quoted from the dealer $385 for the pack, but org members here have gotten it for $140 and i dont know how. I dont know if the vb mad will help. Now for the slight pause in acceleration, it is not my KS because my tires spin to 3rpms from a stop then pause a little, i guess to get back traction.Makes me want the 5speed soo much more

 

i too have this problem with it not downshifting when i accelerate from a rolling stop. would a sticking valve body be causing this? i also noticed that Stillen or JWT sells a modified TCM, would this help any? it's just getting so annoying when i go to accelerate and it revs before it decides to move.

 

teh downshifting is a tranny problem ALL MAXIMAS HAVE....
there is no fix to it...........

How did we get to downshifting anyway? this thread was started because of the rpm drop..................