Dyno in 2WD mode

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Dyno in 2WD mode

Postby No Spin » Wed Sep 14, 2005 5:18 pm

I have read about some of our members using the 2WD test mode to run their cars on the more common 2WD dynos.

(I also read in the BGB that driving in this mode was not recommended. My thinking was that actually driving in this modes would be like towing it with wheels down - AND not the same as sitting on a dyno with the wheels spinning).

Q: Is there any chance of doing any harm to the powertrain while running in 2WD mode on the dyno?
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Last edited by No Spin on Wed Sep 14, 2005 6:49 pm, edited 1 time in total.
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Postby jprine01 » Wed Sep 14, 2005 6:25 pm

Well its not exactly the same as towing it with the wheels down, as that would be working the center diff like crazy. In FWD mode it sort of disables the center diff. For dyno purposes (not driving around) I think its safe. I've heard of one guy that selected FWD mode without putting the bolt back in to secure it, on the dyno it moved and destroyed the trans. But that is because the lever moved while he was putting power down not because it was in FWD mode. Not sure how accurate dyno readings are going to be in FWD mode though.
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Postby 2of81 » Sun Oct 23, 2005 3:13 pm

jprine01 wrote: Not sure how accurate dyno readings are going to be in FWD mode though.


Accurate enough to tune an EMS on. Bragging numbers, yea I wouldn't use this.
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Postby Conan » Sun Oct 23, 2005 3:31 pm

jprine01 wrote:Not sure how accurate dyno readings are going to be in FWD mode though.

Accurate for flywheel HP, however it will give you more HP at the wheels due to less power loss in FWD mode. And yes, you can tune in that mode.
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Postby MATT-S » Sat Nov 05, 2005 3:08 am

The previous owner of my black 185 drove it for over 2 years in 2wd mode before the tranny gave up. It was that way when he bought it. So it can't do a massive ammount of damage using 2wd mode, but obviously it's not designed for it to be run that way.

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Postby SuperWhite92 » Sat Nov 05, 2005 3:50 am

The 165 manual refers to it as emissions dyno mode, too, so it was obviously intended to be run on a dyno where rolling AWD emissions dynoes aren't.
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Postby GT4_CR » Thu Nov 10, 2005 3:19 am

Sorry to ask this but ive never seen the lever that connects and disconnects 2wd and awd. Can someone place a picture of this part, or explain like if i was 10, where is it located so that I can know this better. :oops:
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Postby Gary » Thu Nov 10, 2005 3:23 am

http://home.covad.net/~billprice/Cars/index.html
Click on the "The infamous FWD jpegs!" link

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Postby GT4_CR » Thu Nov 10, 2005 4:36 pm

Gary wrote:http://home.covad.net/~billprice/Cars/index.html
Click on the "The infamous FWD jpegs!" link

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Thanks a lot for the info. Ive seen that lever but never touched it. In my country we have a obligatory emission and condition check for cars, and Im worried for what can happen if i dont disconnect the transmission...
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Postby richard » Fri Nov 11, 2005 11:35 pm

A month ago I tuned my car on a 2wd dyno. Everything went well until my tuner told me my car was ready but he wanted to give it a spin to check everything out. He went alone (I should have gone with him), 5 mins later called to ask for a tow truck! later we found out a part called diferential lock sleeve had broken. This part is not available in the US so it is a special order from Japan. Being A1 the most sold part in Toyota´s registry, this part is f5...this means only God knows when I will receive this part...
so after saving for months , waiting for performance parts, and tune , I didnt get the chance to try drive my freshly tuned all-trac!!!... this was like receiving a christmas gift without batteries..

So I dont know if the damage was done during dyno time or while driving in 2wd mode.
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Postby crazyj » Wed Mar 22, 2006 7:25 am

Oh man taht sucks! Hope things go well for you
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Postby TheRealDealGT4 » Wed Sep 13, 2006 1:28 pm

I dynoed my car in fwd mode, using my aem, it works and doesnt really damage the trans if you dont use it for a long time, but it did mess with my maps when i connected the 4wd again due to the added load in the rear. your best bet is to find a 4wd dyno and do it right the first time or do it again, like i sadly have to do :cry:
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Postby gearhead313 » Wed Sep 13, 2006 5:01 pm

Man, i'd really like to know what is going on in that tranny that you can't run it long in FWD. in my 165 bgb, it says to only run it in 3rd - 5th.. so does that mean that there is too much torque being applyed to the tranny in 1st and 2nd? It just doesn't make sense to me...
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Postby pepper » Thu Sep 21, 2006 3:36 am

gearhead313 wrote:in my 165 bgb, it says to only run it in 3rd - 5th.. so does that mean that there is too much torque being applyed to the tranny in 1st and 2nd?


Yeah, that's what I think it is. The front diff is only designed to handle half the torque put out by the motor in normal use. Just not a beefy enough part to handle the full power on an extended basis, although some have obviously done this for awhile.
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Postby gearhead313 » Thu Sep 21, 2006 11:17 pm

So, do you agree that it would be alright to put it in 2wd, tow it to the dyno, strap it on and ease it up to speed in 1st, 2nd and 3rd then only make a pull in 4th. I'm really thinking about doing it this way and hopefully nothing goes boom!!
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