What have you done to your 1st gen Tundra today?

The shocks and coil overs are the Aluma series from toytec, and then I have 3 leaf add a leaf packs also from toytec and the one everyone knows about total chaos upper control arms lol. I’m almost 200k miles in with the original suspension and about 50k with a 2 inch spacer. So now I can finally replace majority of it and hopefully the ride will be better

 

Let us know how it rides. That seems like a great formula for when i want to step up to 33’s or 35’s

 

Fixt

 

Get out the saw!

 

Oil change today. Still find this dipstick to be the most difficult I have ever encountered to get a good reading from. Next time, I am going to measure out the 6.5 qts.

I used to be a real idiot on a sport bike. Last bike was a tracked-out sv650. Not much power for that engine size as it is a v twin, but with hotter cams, reworked needle jet/jet needle, penske double in the rear, complete gsxr front end with reworked internals: it was an absolute blast in the twisties. Now, I am the old man in the truck yelling at the bikers going up the mtn just like I used to...life is a trip.

 

I just went six to midnight.

 

For sure! I should have them installed either this weekend or early next week

 

Tore open my ECU today to see if these VVTI ecus have programming ports... and im happy to say, yes. they indeed do.


SO there is tune ability to these. now to figure it out.. im going to source a used ECU and give it to my friend to see what he can dig through and see. maybe unlock more power?




technically you can mess with most anything on the ECU with these ports if you know how to read the data. Rev limit, RPM. remove codes. ETC. but its all in hex.

 

Neat. Possibly improvement in gas mileage if these run extra safe/rich. Haven't tried looking at afr's when driving yet.

Maybe speed limiter go bye bye?

 

you can modify ALOT. on the 3.5 they get higher rev limit, mess with fuel mapping. (the 3.5 is actually mapped up to 150% air volume... so they can take boost surprisingly well) VVTI angles... remove codes... ETC

 

Does it use a standard JTAG interface or something else like I2C or SPI?

 

that is a question im not capable of answering. i have a buddy that messes with this stuff. all i know is all the data is HEX.

 

this is what he uses to access the chips though

http://mina.com.ua/TOYOTA/HTML/1_TOYOTA.html

 

The MCP2551 is a CAN Bus transceiver so just the standard bus from the look of it.

 

you know much more than i.. i just do the mechanical stuff and wiring.. i cant understand these fancy computers...



yet.


i do know that the photo i found of an 02 ECU Shows its the old style NON FLASHABLE setup

 

Haha...yeah soon you'll be servicing electric motors, batteries and computers only.

Non-flashable? So the configuration is burnt into the device? I don't see a UV erasable EPROM so that's what I'm thinking.

 

Crushing my dreams right there

However, might I ask what things might you want to change with a flash?

AH, I see, more power is what you seek? No SC for you?

 

im not sure how its done. he knows way more than me. but the reason all the old school toyotas are impossible to modify 04-06 the transition to the new (now actually last gen as of a few years ago) ECU construction

 

if you mess with the fueling and VVTI angles, timing, ETC. you can squeeze more power out of your mods.. i bet theres an extra free 10hp to be found with some tunning from long tube headers.


also. i could get rid of the air injection system without any physically obvious mods.. just completely kill the system

 

It'd still for sure be ROM, just maybe not EPROM right? I'm thinking the EPROM vs ROM cost differential may have still been a margin into the early 2000's. Memory chips were super expensive in the late 90's, then the prices dropped through the floor.

 

So that nobody thinks your cement grey 1st gen is modded? They assume it must be stock?

 

i just dont want that system to cause my emissions issues!


but i also dont want to have to repair it.... when it fails.. because $$$

 

Not necessarily, some of the early PLDs had fuse technology that were burnt in electrically to create the configuration. You could be right about it only being a ROM since I don't see a EPROM chip with a window to erase it with UV light.

 

to add. the hewitt kit works, but only if your system fails a certain way.

 

I haven't touched hardware in decades but top right ESPC looks like the cpu and then there is the crystal for timing. The big square in the bottom right could be the programmable chip for all the code? Outside of that, only 4 other chips are of any substance on that board, 300, 700, 701, 800.

 

CN200 is what he uses i believe. but thers cn100 too. those are the two "pinouts" i could see
im going to find a used ECU and let him have it to mess with in his free time

 

Yeah, that'd be where you'd solder in a connector to plug it in and have some fun. On a production board you aren't going to ever do anything with, you'd save the pennies by not putting that header on. Back in the day it probably made sense to skimp where you could.

 

That's probably only a 2-4 layer circuit board to save cost. Years ago, when I worked with the guys who did a car radar, they had to keep the PWB design to only two layers and the cost to manufacture under $200. The manufacturer then turned around and sold it as an option to the consumer for $2-3K.

 

My hopes and dreams are being crushed right now.

How do these normally fail?

 

80% of the time the bypass works. BUT on their website they states there are certain codes you can’t fix.


And yes I’ve ran into them at work