means piggyback ecu only works with svdo if ecu is in open-loop??..

that's just the price of the ecu unit....... have done some svdo gtis to use haltech and the total cost, inclusive of several parts that need to change to suit the ecu came up to close to rm9k.......

can i tumpang thread?waja 4g18 2001 using what brand of ECU?.n what piggyback can be install with it??

4g18 using mmc

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Added on April 29, 2009, 2:33 pmyeah... i heard my mech said rm4k is jz the main body of the unit... exclude all necessary harness, software, cables, etc....

This post has been edited by the_catacombs: Apr 29 2009, 02:33 PM

I tot 4g18 also using siemens? Although mitsu engine but ecu still svdo. Anyone can confirm?

Yes, 4G18 is running on MMC ECU.

so which piggyback brand is suitable for siemen vdo?
does a piggyback need an afc for controls?

Which Siemens VDO are we talking about?

EMS700 in the Campro, or the EMS400 in the 4G13/15/93?

satria neo siemen belongs to which model?

It's using a Campro S4P, so EMS700.

Dastek Unichip, Apex'i SAFC, Hydra EMS, even Greddy E-manage.. all work well on it.

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Added on April 30, 2009, 11:14 amA piggyback only works when the ECU it in openloop.

This post has been edited by drexchan: Apr 30 2009, 11:14 AM

thanks for the info
might plan to add piggy back next year
RM2k can get or not...

whats the difference between EMS700 and EMS400??..

I almost got SAFC Neo last month, but canceled due to the high price because of the rising yen (from 1.2k increased till 1.6k)

There's another option for Siemens, Works EMS-1. about RM1.6k also. Compete with harnes and software if not mistaken. I may try this.

Difference between EMS400 and EMS700.. a lot. will elaborate more next time i post.

thanks... cant wait...

Elaboration below

Piggyback will be able to work in open loop

Yup..closed loop means intake air is metered,fuel is calculated to satisfy ratio,combustion then checked (O2 sensor) to determine the incomplete combustion then fed back to ecu to regulate the fuel ratio again.Closed loop works to produce best economy and tries to obtain a complete combustion.Problem is its hard to keep the feedback loop constantly updating at higher rpms so it reverts to open loop around +-3500 rpm..when in open loop,the O2 sensors feedback is not taken into consideration.In this range it is possible for piggyback to work since it wouldnt revert back to the O2 sensors feedback.

Just my 2cents

This is a closed loop operation:



Lets assume
X(s) is the MAP/MAF sensor
G(s) is the ECU
H(s) is the O2 sensor
Y(s) is the output (or amount of fuel injected into combustion chamber to satisfy AFR)

When in open loop, H(s) is not in effect,so theres no feebback loop (from this diagram,negative feedback) so you can tap the piggyback between X(s) and G(s) and set it to work only during open loop operation


*waiting for sleepwalker to do the corrections *

This post has been edited by ryan_hustler: May 6 2009, 08:42 PM

vr good info there sifo ryan....

still waiting for drexchan post on difference between ems400 and ems700...

Forgotten to mention, under light load (low TPS signal vs RPM), it's close loop. Once you step more on the pedal, it goes open loop, and that's when the piiggyback will work.

If the ECU can handle the optimum A/F for economical driving, let it do the job. Piggyback takes over only when you want better performance. This, to me, is just ideal.

This post has been edited by drexchan: May 7 2009, 08:12 PM

As far as i know,the only way of reverting to factory setting is to disconnect the car battery...unless theres a limp mode im not aware of..

btw,you cant re-tune the factory ecu..

Can't retune stock ecu?
I went to Proton Service Center, they want to charge me RM86 for retune my ECU, since my idle rpm is too low...
Seems like expensive to me, so hold on for the retune for the moment

Mine is SVDO