how to raise Rev limit on an Automatic

[PhilipMc]

I have a 98 mitsubishi eclipse gs automatic and I was woundering how you raise the shift points or redline, whatever you would call it, because I plan on getting performance cams and I want to raise it by alittle because they allow you to rev higher. Also, yes I know you have to build the whole block to rev to 9grand and I understand that.

 

[Slo2gen]

Either do like we said in this thread you made a while back....http://www.dsmtuners.com/forums/tuning-engine-management/424624-megasquirt-question.html

OR by some type of shift kit, I'm not all up to date on the A604 trans upgrades and their aren't too many people running a lot of power through this. I would recommend looking into neons.org, seems like a lot of them making BIG power switch to Auto...

 

[GSLENK]

I don't know if there is any point... your engine may be out of its power band anyway. (idk about 420a)... but I'm pretty sure its out of the power-band by the time you red line or auto shift anyway.

I had an 85 corvette A/T and had the trans rebuilt. I had the shift points set further back by like 500 rpm because it wasn't shifting at the red line from the factory setup.

I found that my gears just wound out longer, and I suppose it put me higher in the power band in the next gear when shifting at max rpm.

Either way power was flat-lined at like 5500 rpm max maybe between 5000 and 5500. (ts a 5.7 v8 from 85... what you expect?)

Having the shift points set back from like 6000 to 6500 didn't do much except let the engine wind up more. no more power, and I would imagine not much point.

Anyway you have should have no real interest in raising your rev limit, or even shift points. I assume there will be no gains, especially on a 420a. Now if you are doing this to a built engine then thats a whole different story.

First build your race engine, then decide what your rev/shift limits are based on component strength and valve-train, rotational vibration etc...

one step at a time brah, rev limits are waaayyyyy towards the end.

 

[Bud92gsx]

Two things.Get the tcu chipped, but that is permanant.


Or this. RoadSurge Shift box - Manual Shifter

 

[Slo2gen]

Two things.Get the tcu chipped, but that is permanant.


Or this. RoadSurge Shift box - Manual Shifter

Pretty sure that wont work with the A604 but you could always email them and ask.

 

[Bud92gsx]

Pretty sure that wont work with the A604 but you could always email them and ask.

I already asked Tim..It does work for 420a's...

But you can email him and see if you need to extend the wires or something...

I was just gonna ask Tim again, but he's going to bed.So just email him.He'll get back to you tomarrow.

 

[PhilipMc]

Do they have shift boxs that arent just buttoms?

 

[necrotopsy]

Seeings how the a604 is one of the worst designed automatic transmissions ever made... DON'T DO IT.

with that said, the automatic shifts at about 6,400 rpms
the 5 speed rev limiter is 7,300 rpms.
raising the shift point to 7,300 wont hurt the engine.
but it will most likely destroy your transmission.