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Discussion Starter · #1 ·
I drive a B15 SR20DE with an auto transmission. When I get on the freeway I usually turn the O/D off so I can get up to speed faster, then when I hit around 60 miles an hour with the tach at around 2750, just as it keeps climbing up to 65 miles and 3000, I can feel the engine slows down a little, and physically seeing the tach needle drop back to 2750 then shoot back up to 3000...3250...what would cause this? Knock? I doubt it though cuz I run only 94 pump gas at stock timing. And it also seems to happen when I hammer the gas and switch O/D off at the same time to pack some punch...I can feel the engine race up to around 4500 but then all of a sudden I'd feel a drag and can hear it drop back down to 3750 before climbing all the way up to the redline again. What would cause this? Too much oil in the crank-case? Tranny pressure drop? Fluid too hot? Timing?

Please let me know...
 

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Registered
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723 Posts
i dont see why you need to turn OD off anyways since it just "blocks" 4th... you can achieve the same thing by staying heavy on the gas so the engine will stay (or downshift) into 3rd
 

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pwnd
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3,455 Posts
Hmmmm well from jason sounds like they did some wierd stuff with the trannies in the 2k's. From that last line the first thing that came to mind was the tranny was slipping. Just for a tip, dont hit the button and floor it at the same time. If you are going to be flooring it dont touch anything, let the electronics do their thing, it will take a second but will make the tranny last longer. I leave the o/d off around town from old tips from AOD equipied stangs to make the tranny last longer. round town driving hell on an automatic if it ends up shifting up and down and locking and unlocking the torque converter so much. But dont down shift too much, and i would lay off switching off the od when you are flooring it.
 
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Discussion Starter · #6 ·
The reason why I O/D off when I kick the car is because it "physically" gets it out of 4th and down to 3rd to pass...

Since we're on the slush box topic...here are more questions...

Does downshifting physically down to "2" to slow down do any harm to the box?

Same question above but hitting the gas at the same time to pass?

If I put in a giant cooler...I am thinking something like 15 by 7 by 3/4...would it cause too much pressure drop in the box itself thus causing slower shifts?

When I go downhill...I put it into "N" that doesn't do anything bad does it?
 

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Turd Furgeson
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3,935 Posts
Going into neutral in a hill; not bad. Power shifting your automatic; fun, but bad, but really fun.
 

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Registered
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705 Posts
<font face="Verdana, Arial" size="2">Originally posted by KICK ASS MATT:
Does downshifting physically down to "2" to slow down do any harm to the box?

Same question above but hitting the gas at the same time to pass?

</font>
Bad bad bad Bad bad bad Bad bad bad Bad bad bad Bad bad bad Bad bad bad Bad bad bad Bad bad bad . ok im done, but geez, common sense should tell you that is not good for the car.Dont do it first thing to go will be your head gasket, trust me. And it doent take much.

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Ryan Walsh, 1997 200sx SE-R w/ ES mounts, JWT s4's, AEBS 4-1, PR CAI, Sportlines/AGX's, Bridgestone re730's, Matrix FSTB, Stillen GTR grill
 

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Registered
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705 Posts
<font face="Verdana, Arial" size="2">Originally posted by KICK ASS MATT:
The reason why I O/D off when I kick the car is because it "physically" gets it out of 4th and down to 3rd to pass...

Since we're on the slush box topic...here are more questions...

Does downshifting physically down to "2" to slow down do any harm to the box?

Same question above but hitting the gas at the same time to pass?

If I put in a giant cooler...I am thinking something like 15 by 7 by 3/4...would it cause too much pressure drop in the box itself thus causing slower shifts?

When I go downhill...I put it into "N" that doesn't do anything bad does it?
</font>


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Ryan Walsh, 1997 200sx SE-R w/ ES mounts, JWT s4's, AEBS 4-1, PR CAI, Sportlines/AGX's, Bridgestone re730's, Matrix FSTB, Stillen GTR grill
 
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