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Which Ecu To Get; R34 Gt-t Tiptronic

satanic

By satanic,
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satanic Grand Master

satanic

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Thanks for that Paul, excellent read... and I'll take your advice and read up further on the two.

Arkon, ROM tuning has been crossed out of my options list - too complicated, too little aftermarket support, too little tuners and at the end of the day too complicated to tune!

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Sydneykid Grand Master

Sydneykid

Posted
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As posted many times, here is the problem.……..if you want more details so a search.

The standard Auto ECU has mapping to retard/cut the ignition on gearchanges. This gives nice, comfortable, jerk free changes and protects the gearbox from excessive torque loadings during the change.

NOT ONE after market ECU has that mapping, it is extensive, complex and therefore expensive to program. Supposedly there are more lines of code in the auto mapping than there are to run the engine.

If you completely replace the standard ECU you get no ignition retard/cut and the higher power you have the rougher the gearchanges and the quicker the gear box will wear out the 2nd gear bands and 3 + 4 clutches.

To retain ignition retard/cut you have to leave the standard ECU in control of the ignition timing. You can use any other ECU to run the injection. Hardly ideal but workable. Other than the Power FC which uses the AFM, the other ECUs’ use MAP sensors. You could use a Power FC to run the injectors and the standard ECU to run the ignition, obviously having no control over the ignition will limit your tuning options.

Using the SAFC on its own, you (or the tuner) have obviously hit the compromise limit. Less fuel needed, but the ignition is already too advanced. That usually happens around 225 rwkw. You may find an injector upgrade changes the mix of those components and the compromise becomes less. In my case I use the SITC to give some independent control of the ignition timing. Since the SITC sits between the CAS and the ECU it doesn’t interfere with the ignition cut/retard on gearchanges.

Some guys have had recent success using the EManage, to give more control over the injection and ignition. The early problems with the standard igniters seems to have been overcome. Do a search if you want more details.

Some guys swear by the chip upgrade, personally I have had no experience with that solution. Do a search if you want more details.

I think that covers the options, for the Stagea I looked at them ALL for some time and ended up with the DFA (SAFC equivalent), IEBC (boost controller) and SITC option. My power target is 210 4wkw (equivalent engine output to 230 rwkw in a 2wd manual). I can not see any reason why I won’t reach that target.

Hope that was of some help

:) Cheers :D

satanic Grand Master

satanic

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So the general concensus is that not even the Haltech would work? In my Dyno Results thread, we were throwing some ideas around and some people were in agreement that the Haltech will be able to overcome the auto dramas.

Anyways, back off to tuner this Sunday - I'll bring a pen and paper!

Sydneykid Grand Master

Sydneykid

Posted
Posted
So the general concensus is that not even the Haltech would work? In my Dyno Results thread, we were throwing some ideas around and some people were in agreement that the Haltech will be able to overcome the auto dramas.

Anyways, back off to tuner this Sunday - I'll bring a pen and paper!

There are 2 dimension to the ECU and auto discussion, the first (#1) is the control the ECU exercises over the igntion timing on gearchanges (that's the post above).

The other (#2), far less important, discussion is whether or not the ECU has the relevant outputs for the Auto ECU to make the right choices for the gearchnge. Road speed, engine rpm, throttle position etc outputs. Most ECU's have those, they are very simple.

It's the #1 that no aftermarket ECU has.

:laugh: cheers :huh:

mr 32 Grand Master

mr 32

Posted
Posted

stan

have you though about the motec m800. herrod perfomane in melborne have it on a big hp ts50 and it controls the auto in it which is a tiptronic. give herrod a call see what they say i know its a ford but might give you a better idea of how to get it to work.

Herrod Motorsport 03 9464 5100

talk to Robert Herrod

satanic Grand Master

satanic

Posted
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Posted

Cheers mr 32

Haha, Wink, how about you give me the money to try that one out... then we'll talk!

OK someone give me some solid answers... I'm hoping to get this thing on the road in a week or two (making a decision that is)

silver gts-t Grand Master

silver gts-t

Posted
Posted
This basically means MAF will be more accurate on the say 20x20 map grid as it can move around very freely based on air coming in and always show an increase (ie: use the map resolution you have).

You should read up on how they both work to understand as it will affect how the car runs and drives. You should also look for an ECU with closed loop feedback (fuel economy) and knock sensor support

MAF (commonly known as AFM or Airflow Meter)

mass air flow sensor

MAP

mass air pressure sensor

would the accuracy of a MAP incease on a 32x32 grid?

paulr33 Grand Master

paulr33

Posted
Posted

no it will not, as when you reach target boost say 12psi

the map sensor will always see 12psi and say the amount of air coming in is the same value, as the pressure is always the same. so it will just flat line along the LOAD axis despite more and more coming it.

basically v8 map sensor style. the tune increase purely on rpm increasing

silver gts-t Grand Master

silver gts-t

Posted
Posted
no it will not, as when you reach target boost say 12psi

the map sensor will always see 12psi and say the amount of air coming in is the same value, as the pressure is always the same. so it will just flat line along the LOAD axis despite more and more coming it.

basically v8 map sensor style. the tune increase purely on rpm increasing

pm sent to avoid thread getting off track...

satanic Grand Master

satanic

Posted
  • Author
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OK received an email from UNIGROUP regarding the TSI; all up cost is around $2500 so it's not a cheap option. However, it doesn't look like they want to go near this option for my car as they offered the alternative of the SAFC which is 1/10 of the price ~

Mmmm... one option struck off then!

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