The old 94 TCU into the 90 Q45 Topic

[halfoffautoparts]

Awhile ago there was some talk and experimenting with this to get the 1st gear start without haveing to pay the bucks for the 93 TCU. I can't find the info in the archive - if anyone has the link or info let me know.

I want to combo this with the ECU upgrade. Has anyone done this?

[elwesso]

94 TCU works fine.. We tested on a 92 Q with 94 TCU.. 94 TCU, 94 ECU..... Worked perfect, but at WOT it held the shift just a tiny little bit longer, no worries though... Trust me, get it and youl love it!

[Jesda]

I love it! Takes off like a bat out of hell.

For smoother shifts I let off the gas slightly just at 7000rpm. With the 94 TCU it goes slightly beyond 7000 before shifting.

[DR.Q]

Awhile ago there was some talk and experimenting with this to get the 1st gear start without haveing to pay the bucks for the 93 TCU. I can't find the info in the archive - if anyone has the link or info let me know.

I want to combo this with the ECU upgrade. Has anyone done this?

I've got the same combo. Mine shifts at about 7200 rpm.

[halfoffautoparts]

Wasn't there a place to get one for $58 shipped, or some other great price? Pn the ECU, it will work better with the 94 then the 90?

I was thinking of getting the upgraded ECU - is the company JCU or JET - I can't recall. Who has the best price on these?

[elwesso]

JWT

AAAcomp (on NICO) does the upgrade for 90-93 Qs... Email him..... JWT is about 600, i think his is around 200

[halfoffautoparts]

How do the two compare?

[DR.Q]

[QUOTE=halfoffautoparts]Wasn't there a place to get one for $58 shipped, or some other great price? Pn the ECU, it will work better with the 94 then the 90?

YUP. Check this link.

http://nicoclub.com/zerothread?id=57765

[GreenQ45a]

Is it worth getting a TCU for a 1994 Q45a?

Or should I just go with ECU?

[halfoffautoparts]

I will start hunting around for one of these. BTW, where is it located in the vehicle to remove? Also, does anyone have the AAAcomp ECU upgrade?

If I can find the 1993 TCU for about the same price - (31036-64-U20) - would this be a better choice?
Modified by halfoffautoparts at 6:44 AM 11/8/2004

[elwesso]

Is it worth getting a TCU for a 1994 Q45a?

Or should I just go with ECU?

The only reason... WIth a JWT ECU and no TCU it will shift at WOT at the stock 6900 RPM... You have to hold the gear selector all the way to 7300. Personally I do this anyway so its no biggie!

I will start hunting around for one of these. BTW, where is it located in the vehicle to remove? Also, does anyone have the AAAcomp ECU upgrade?

If I can find the 1993 TCU for about the same price - (31036-64-U20) - would this be a better choice?

The TCU is located on the drivers side kick panel (carpet piece right by the parking brake).. There a nut on the firewall, covered by a piece of carpet that you must remove... 10mm... The ECU is in the same place, onthe passenger side... Same deal.....

I think Qship has the aaacomp upgrade... IMHO the JWT isnt worth the money (I have it) for what it does... For $200 i think its worthwhile!

93 TCU- if you can find one for the same, sure itd be better, but dont go searching around for months for a 93 when you could go out and get a 94 TCU tomorrow!

[Jesda]

The shift points in the 93 TCU result in smoother shifts under full acceleration, so yes, get that if its the same price.

Green: No point changing the TCU in a 94.

[elwesso]

Green: No point changing the TCU in a 94.

Only true if you dont have a JWT (or equivalent) ECU... THe stock TCU IN DRIVE will shift at the stock redline......

[GreenQ45a]

I will be upgrading my ECU.The only infomation I found @ JWT says:Give's 1st gear starts.Doesn't the 94 start in 1st anyway?

I was gonna oreder a JWT ECU.. then I thought about making one myself and coping the EERPOM from a JWT. I can't find a EEPROM image for the 1994 Active Q45.

I understand the socket makes for a quicker change out.Can't you just flash the EEPROM on the ECU?

I was wondering if the GReddy Engine controller would give you the same effect...

[GreenQ45a]

Here's another shot:

[halfoffautoparts]

AAA Comp e-mailed and they no longer do the ECU upgrade. They said the choices are JWT or Dinan. Anyone have info on the Diban or direct experience with it?

[Q45denver]

I would like to sell my 1993 JWT ECU and 1993 TCU that I have in my 1990 Q45 if I could get a decent price. I think I have over $600 in these two items. I got a matched set because I thought they would work better together. There is still a slight harshness to the 1 to 2 shift but it might have more to do with my rebuilt transmission. I tried the AAAcomp unit previously and it did not work. The reason for wanting to sell them it that my engine developed a rod failure for the second time and am thinking that there is not enough of a safety margin in the design of the JWT. I still have the original controllers that came with the car which I would reinstall. I heard that the 1990 ECU might have been setup for higher performance anyway and in all honesty I did not notice that much difference other than the higher shift point and the higher top speed due to the removal of the limiter.