Hey guys,

Does anyone know of a way electrically or mechanically to force an up or downshift in an automatic trans? Kind of like triptronic.

Thanks in advance,
Joe

 

its all done by vacuum pressure and th motors speed.

 

The HONDA manual says if you touch the pedal to the floor (accelerator) then it DOWNSHIFTS to give you more power (because you're in a higher rpm range). The only way I know to downshift is if you're in 4th gear, you hit the shifter to D3 (instead of D4) which allows ONLY gears 1,2,3. (D4 allows 1,2,3,4). After that, you can switch it to 2 (just 2 not D2) but from there, the only way to downshift is to floor it.

I don't know of a way to force an upshift, but I have an excelent feel for my transmission, and I can do it all by touch on the accelerator. just let up on it (if you're accelerating hard) and you can feel when it upshifts, because you drop to a lower powerband, and the rpms drop. Watch the needle (if you have a tach, that is) and you'll get the hang of it.

I'm assuming, btw, that you ask for purposes of AutoX/racing. If you just want to shift for daily driving, while its fun, its not really useful. Bad gas milleage. Others will tell you shut up and buy a 5spd, so don't be surprised. Or hurt.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LemonLime &raquo;</TD></TR><TR><TD CLASS="quote">The HONDA manual says if you touch the pedal to the floor (accelerator) then it DOWNSHIFTS to give you more power (because you're in a higher rpm range). The only way I know to downshift is if you're in 4th gear, you hit the shifter to D3 (instead of D4) which allows ONLY gears 1,2,3. (D4 allows 1,2,3,4). After that, you can switch it to 2 (just 2 not D2) but from there, the only way to downshift is to floor it.

I don't know of a way to force an upshift, but I have an excelent feel for my transmission, and I can do it all by touch on the accelerator. just let up on it (if you're accelerating hard) and you can feel when it upshifts, because you drop to a lower powerband, and the rpms drop. Watch the needle (if you have a tach, that is) and you'll get the hang of it.

I'm assuming, btw, that you ask for purposes of AutoX/racing. If you just want to shift for daily driving, while its fun, its not really useful. Bad gas milleage. Others will tell you shut up and buy a 5spd, so don't be surprised. Or hurt.


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Well thank you for the advice. I own two Hondas, both are 5spds. I would never buy another auto, especially knowing how shotty Honda ATs are. I'm working on a device similar to something already available for DSMs.

 

How about interacting with the transmission solenoids?
Anyone have specifications on the trans solenoids?

 

I wouldn't futz with the solenoids because if you get the timing from gear to gear off just a little, you can have more than one gear/clutch engaged at the same time which would be death to the trans. Plus there would be no duty cycling so you would be engaging the clutches with full line pressure on each shift which can also decrease trans life.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by King V &raquo;</TD></TR><TR><TD CLASS="quote">I wouldn't futz with the solenoids because if you get the timing from gear to gear off just a little, you can have more than one gear/clutch engaged at the same time which would be death to the trans. Plus there would be no duty cycling so you would be engaging the clutches with full line pressure on each shift which can also decrease trans life.</TD></TR></TABLE>

I wouldn't build anything without specs. That way I can ensure not more than one solenoid is switched at the same time, and see what voltages etc. are required.
I know all the shifts would be full pressure :-\, it's a benefit on the road, but I know it will be a nightmare for the already-shitty Honda ATs. Regardless, I'm still very interested in the project.

How would you suggest I force shifts for my project? Can I send a voltage signal somewhere from the ECU? The solenoids are looking like the best bet so far.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BrakeDanceJ &raquo;</TD></TR><TR><TD CLASS="quote">Well thank you for the advice. I own two Hondas, both are 5spds. I would never buy another auto, especially knowing how shotty Honda ATs are. I'm working on a device similar to something already available for DSMs. </TD></TR></TABLE>

How are they "shotty"? I realize they make the car ridiculously slow, but if you maintain them then they can go for a preeeeetty long time.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JKov240 &raquo;</TD></TR><TR><TD CLASS="quote">

How are they "shotty"? I realize they make the car ridiculously slow, but if you maintain them then they can go for a preeeeetty long time.</TD></TR></TABLE>

They tend to break often, and shift like crap right from the dealer. As someone on another forum put it: "They make my 1942 buick seem like a smooth ride".
Not to mention they were designed to handle &lt; 90WHP, as opposed to say an eclipse that was designed to hold 350.

 

Yep, I've seen a auto d15 with 23X,XXXmi thing shifted normal.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BrakeDanceJ &raquo;</TD></TR><TR><TD CLASS="quote">They tend to break often, and shift like crap right from the dealer. As someone on another forum put it: "They make my 1942 buick seem like a smooth ride".
Not to mention they were designed to handle &lt; 90WHP, as opposed to say an eclipse that was designed to hold 350. </TD></TR></TABLE>

I work at an import auto repair shop and see my fair share of Hondas/Toyotas.

They're not the smoothest shifting in the world (kinda give you that "lurch" when you shift), and the only way that I'VE seen them break is when people don't flush the fluid regularly...which will naturally make them break. Unless you're out doing neutral bombs, but that's a driver error.

And Honda designed them from the factory to handle that...it's an econobox, not a racecar

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JKov240 &raquo;</TD></TR><TR><TD CLASS="quote">

I work at an import auto repair shop and see my fair share of Hondas/Toyotas.

They're not the smoothest shifting in the world (kinda give you that "lurch" when you shift), and the only way that I'VE seen them break is when people don't flush the fluid regularly...which will naturally make them break. Unless you're out doing neutral bombs, but that's a driver error.

And Honda designed them from the factory to handle that...it's an econobox, not a racecar </TD></TR></TABLE>

For sure.

Full-pressure shifts aren't for economy :-), I'm going to dig out my Hanes manual and map out the electrical portion of things tonight or this weekend.