Reply to thread

See what others are reading now! Try Forums > Current Activity

Message: <blockquote data-quote="shiroitenshi" data-source="post: 3025034" data-attributes="member: 27518">Piggyback applies what we call a lambda on the original fuel mapping. remember the tables your tuner looks at? as an example, The RPM is the 1000,2000 value, called the RPM index, The 1, 2, 3, 4, is the load zones (or load index), some, like the PowerFC, uses numbers, while hondata, uses actual units (it doesn't matter really) Most piggybacks just use TPS to simulate the load index, like VAFC, Neo, etc. which means a little like guessing where the computer is ACTUALLY reading the map from.You can also replace the load zones with TPS indexing on standalones, but usually that's done for running quads, because they can't have good part throttle (on/off driving) at low rpms due to lack of good MAP signal (it's doable, but well, what's the benefit of running quads with a tuning method designed for manifolds?)That's why that's there manifold versus ITB, which is better? debate down in honda-tech, I think.Back to topic. Well, what the piggyback does is apply 'adjustments to the map'Like emanage, and unichip, they work in this method. They add adjustments to the original mapping, which is all good and fine, if the original mapping is static.The thing is, the mapping of honda ecu's in open loop mode is not static, (for the most part, at near to full throttle it's static) it changes from time to time, courtesy of it's long term and short term fuel trim. I think powerFC does this feature the best as an example, just start and wait for it to find it's own idle during intial setup. That is a more extreme example of how it works, but even the stock honda ecu's have that feature, although not at such a high correction rate.But it's not like piggybacks are bad, they are good for minor adjustments, esp when the original ecu mapping is suited to the engine, but just need a little tweaking. In the B20B case, most of the ECU's used, the original mapping is for the B16A, imagine what kind of adjustments are needed for that, and what kind of fuelling changes the original honda ecu will do as time goes by.having a static lambda (fuelling adjustment) while the stock keeps adjusting itself, it's like trying to swat a moving fly while driving a car in the rain. lol. those raindrops and the fly start to blend in.. and both are moving, so you can't really see where the actual fly is.I'm not sure if the newer gen piggybacks start tricking the 02 into a closed loop mode yet, but if you're the curious type, if D14 on the P30/P08 ecu is connected to the piggyback, then it probably is. I think that's probably one way to get around it, but well, originally piggybacks were made to map more accurately the original mapping (cleaning up the mapping due to added mods that changed the flow of the engine, when the original cannot cope anymore) I don't think it'll ever come to that since it's like the piggyback trying to become what it's not, but well, just thinking out loud.Well, that's just a small aspect of tuning. Now I know why mat salleh find it so fun. :P</blockquote>

Verification

The Marketplace Latest

Mitsubishi Lancer Evo bodykit
- Started by jeff6126
- Exterior and Body
BMW F30 M3 front skirt lip
- Started by jeff6126
- Exterior and Body
Honda Civic FC fk7si front bumper set
- Started by jeff6126
- Exterior and Body
Mercedes Benz W213 E63 AMG Body Kit
- Started by jeff6126
- Exterior and Body
Honda Civic FD TypeR body kit
- Started by jeff6126
- Exterior and Body
BMW F30 M3 front bumper set
- Started by jeff6126
- Exterior and Body
Honda city gm6 front bonnet hood
- Started by jeff6126
- Exterior and Body
Honda Civic FC fk7si front bumper set
- Started by jeff6126
- Exterior and Body
BMW E60 M5 Front Bumper set
- Started by jeff6126
- Exterior and Body
original rare R-Pride Wado Sakura flower 15x5jj...
- Started by david tao
- Chassis and Wheels

Posts refresh every 5 minutes

Shots of Sepang open track day- 24 October 2010

https://www.zerotohundred.com/wp-content/uploads/2010/10/sic1-600x399.jpg

The recently concluded Sepang open track day on 24 October once again saw a myriad of cars making a beeline to the Sepang International...

looking for something

hi there guys ,
I am looking for a GXE altezza (6 pistons) chrono meter . anyone selling it ?

FS: Varis products & many others

All items in excellent condition...GUARANTEED!!!
Please call - Chris 0123289328
Items are in Penang. Pricing includes transportation up to KL only.

NEW ITEM ADDED...