that kid doin a power slide cracks me up

 

Its all that torque in his front wheel drive tricycle. Hidden under the back crossmember is a .90 size RC plane motor so he can do burnouts....

 

I like that Sega commercial. Bycicle drifting, big trucks drifting. Funny.

 

April 21, 2003

UPDATE!

Dyno of the car resulted at 278 at the crank. It's from a Bosch dyno so it's not a regular dyno jet or dyno pack. It's an older dyno style that gives results in k/w... used for tuning purposes most of the time... I think most people in Japan uses that. Anyways, the ECU was re-flash with the stock program and went back and re-dyno and it was the same 278. Interesting note, if you disconnect the battery after a mod for example... you gain a few HP [3-5], but then then the computer re-learns and it brings the curve down a bit.

locating the fuel map for the car seems to be the most difficult portion of the ecu reprogram.... It seems Nissan didnt' go with their traditional fuel/timing map layout. Ignition map is already found. Doesn't really make much sense (in terms of what it displays) but we found it. The Tuner has the Japanese 350Z ECU mapping. He's using it to compare between the the two. He's thinking about putting the JDM program in the US computer and re-dyno and see results.

Updates will be posted on this thread.

thanks for your Patience..

--Cheston

 

The dyno result of 278 is in horsepower, not kilowatts correct? How much of a hp difference from a Bosch dyno to a dyno jet or a dyno pack? Thanks for the update Chebosto.

 

I'm confused... you lost HP?

 

I'm gonna guess, although I could be wrong, that he meant at the wheels not the crank, seeing as he'd have to drop the whole engine to measure power at the crank. So basically yeah, this is a worthless post.

 

I think he means 278 k/w at the crank. What is that in HP? 372. Does that sound right for an ECU? no. whats the deal here?

 

This is either really great!

Or really horrible.

 

Ok in response to like the last five posts, his post says

"Dyno of the car [with new ECU flash] resulted at 278 at the crank ... Anyways, the ECU was re-flash with the stock program and went back and re-dyno and it was the same 278."

So the ECU caused no change in power.

 

Taken from a Website on the Bosch Type Dyno:

The BOSCH Chassis Dynamometer LPS 002 measures the dynamicwheel power and the power loss in the transmission, and displays the effective engine power (brake horsepower) directly as the sum of the two.

A test-roller set with a defined inertia effect (inertia flywheel) is driven and accelerated by the vehicle's driving wheels.

The power at the wheels can be determined from the acceleration of the Dynamometer mass with the engine running at wide-open throttle (WOT).

Upon reaching the measurement speed, the engine is disconnected from the remaining drive elements by declutching. The energy stored in the test-roller set now drives all the transmission elements with which the test rollers are in contact.

The power loss is determined from the deceleration resulting from the rolling resistance, and from the transmission and bearing resistance's.

Using the wheel power and the power loss, an electronic evaluation unit calculates the engine power at the clutch.

The evaluation circuitry measures the wheel power during acceleration and the power loss during deceleration


--- so.. my car using this dyno technique. gave 278 at the crank....
that will be the baseline numbers approximately in which we will be using...

this is strictly done for tuning reasons...

a dynojet dyno will be used once the program is completed, to get some numbers so people dont flip out when numbers are stated..

 

sorry. i might have made a slight grammatical error.


NO NEW PROGRAM WAS YET INSTALLED


STOCK program dynoed at 278. the STOCK program was REinstalled to check if the numbers were the same.. which it was..
we did this to make sure we really had a baseline data to work off of.. the removal of the battery was to test if REinstalling the STOCK program would be any different than removing power to the ECU. ie. to simulate an installed new modification which people do....

just a reminder... the NEW program is NOT yet installed.

 

Thanks, that clears thing up a little.. and it's good to hear from you . I knew, you knew, the difference between crank and wheels. But sorry too hear the disassemby is proving so difficult.

Signed,
Still Lookin Forward

 

I think EVERYONE knows the difference between crank and wheels. Not everyone can decipher vague posts. It's no big deal, but it was sort of ambiguous. I can't wait for some real answers to this!

 

Chebosto,
So 278 to the crank...I'm curious what it put down to the wheels, that way we can see the actual % of drivetrain loss.

 

REPOST from another thread.. incase you missed it:


There are seven different ECUs that are made for the Z. Our beloved 350z is the first ever nissan using a network system where each part of the components have their own computer. Think of it as a LAN network.. there are two wires traveling from each component going to a main network line.... ABS has its own computer. VDC. Tyre Pressure.. they're all talking to the main computer.. and which relates to changes... intake, exhaust. everything is controlled indepentdently thru sensors, so adjusting the ECU is harder than you think. we're trying to intercept those messages and decypher what they all mean. This might be the cause of why so many people are dynoing their Injen intakes at 15+hp right after install, but a few monthes later, the gain is back to Nil.



-----

If anyone has the following cars and is willing to help out, you'll get a (free?) ECU upgrade as compensation... the only thing is, we'll need your ECU for about two weeks, so if you have a beater car, then how about helpin' the community out?

BASE model: NO options.
ENTHUSIASTS: TCS only. NO Other Options
PERFORMANCE model: NO options
TOURING Model: AUTOMATIC, No other options.

(track is covered with my car..)


I think if we can just get the BASE model, and using my TRACK we can find out what is different between the two programs, the other ECUs might not be needed...



Any Takers? please PM me..

--Cheston

 

again...

best bet is stand alone unit (like motec m48 for the Z33).

 

Sorry motec cannot run this one

 

hmm.. i wonder what they are doing with mine, then....?

 

piggy backs arent the answer...

if you dont get to the core of the car's controls, and then you add different variables to input it to force the car to change, its going to know and change it all back...

if you change the core programming, then you can use piggybacks to fine tune a modified core program...