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Hunty
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Adelaide
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July 2002
 
tuning up 100kw 4age Mon, 12 July 2004 10:28 Go to next message
Hey guys just wondering what sorta stuff can you play with on thes engines, i had a 4ac before this one, can you play with the timing or is that controlled by the ecu? what sort of advance should i run 10deg? more? i only put BP ultimate 98RON petty into it, and castrol magnatec oil. Im guessing all of the a/f mixtures are set by the ecu, so not much play there, if i take it to a mechanic to tune it is there anything he can do to make sure its running at 100% any tests? prolly should get a compression check? whats the right compression for these engines in psi? Its only been in my car about 3 days now Smile before that it was sitting on my garage floor for almost 12 months, it goes well but i wanna make sure its running its best

Thanks guys
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sik sx
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March 2004
Re: tuning up 100kw 4age Mon, 12 July 2004 11:39 Go to previous messageGo to next message
the timing is not controled by the ECU u can change it to possibly perform better in different scenario's..i think 1 term used its top dead centre..once driving it is a tad quicker..but will idle like shit etc..i am not 100% but i know there is something along these lines..good luck
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THE WITZL
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July 2002
 
Re: tuning up 100kw 4age Mon, 12 July 2004 12:31 Go to previous messageGo to next message
WRONG.

the ECU controlls ignition in a certain manner of speaking YES, but you control it's reference point.

The ECU controls ignition advance my increasing or reducing the amount of DELAY from a certain reference point the dizzy is set to when the ECU is in diagnosis mode. To do this i recommend you read the 4A-GE engine manual in the "Tech Docs" section here on Toymods. Its real easy to do!
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HighRolla
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January 2004
Re: tuning up 100kw 4age Mon, 12 July 2004 12:51 Go to previous messageGo to next message
Unless the engine is significantly retarded in terms of base ignition timing I doubt you will gain from advancing the base timing. You can advance till you hear pinging..but the thing is you won't notice till you drive down the street or lug it up a hill slightly in 5th or hot day etc by that time you are pinging badly and not doing the engine any favours. Buy or borrow timing light and look for mark on crank pulley. Bridge diagnosis terminal and check timing. Timing shouldn't be out unless somebody has played around with it.

I put the dizzy cog on 180 degrees rotated once and this caused me to not be able to get the base timing right was either too far advanced or retarded (put new inner dizzy seal in)...so had to swap it around. Some people play around with cam timing..i.e changing relationship between intake and exhaust cams (usually using adjustable ones) but I wouldn't bother.

If your engine is running well I wouldn't play around with it too much..check timing you should do, if your curious at comp - go for it, could get injectors flow tested - or ultrasonically cleaned.

Good luck with it.

PS Mine is running with 10 deg advance pretty well, wouldn't want to advance any more on standard fuel. THe thing is if you run 98 octane and tune for that , then you may get stuck somewhere where they don't have it and have to put the normal stuff in. I'm not sure how many degs extra you can get if you run 98 octane (maybe 3 degrees??)..is it worth it (For what 2-3kw?)

[Updated on: Mon, 12 July 2004 12:54]

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Hunty
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Location:
Adelaide
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July 2002
 
Re: tuning up 100kw 4age Tue, 13 July 2004 04:26 Go to previous message
ahh injectors are brand spankin new reconditioned ones ($40a pop) Razz screw $200ea new from toyota. the originals were stuffed, went to have them cleaned and they said 3 of them didnt even flow and the forth ones spray pattern was all shagged.

am i right that more base advance like higher than 10 will cause pinging? is this because it runs lean? and if its lower ie 10-8 it will chew more petty and run richer?

Hmm so its just like doing the timing on a 4ac? loosen that bolt on the dizzy and turn till the timing lines up? But i have to short the diagnostic terminals? i'll have a look at the 4age book hehe prolly answer most of my questions


Thanks again
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