The Tuning Talk Thread - Forced Induction EFI & JZ Tuning.

[pato]

Nope I haven't noticed any lag but i'll watch for it tonight and report back. When you save them and look at them later is the lag present in the log or is it a real time comm. error ? Might be as simple as the the wrong cable usb-b or a PC setting.. When I hooked up my emu I oouldn't see half the adj. maps on my screen . For example It would only show down to 4.0v on the airflow map . Turned out it was in my PC settings.

One thing I forgot to mention regarding the knock signal . I'm running meth injection so that might be keeping it under control. I haven't seen a knock signal since installing it,, even on the safc. 91 octane is the best juice I can buy at the pumps here so I saw meth as my best option. Working out great so far

I decided to leave the 380's in for my first startup . I wanted to know what I was doing before I droped the 650's in. With the 380's I was at 92% duty @ 4800 rpms 15psi . I had to toss the 650's in right away ( last night) . I also wanted to get a clean base tune down before I switched .
If I understand the system right all we have to do is change the before /after injector size and lag time and the EMU will use the exisiting map I already set with the stockers . I'm not sure how well thats going to work out but i'll let you know ... tonight . Damn work gets in the way LOL
I really like the Trace Map option. It highlights the current block that your running in which makes for spot on calibration for that area . Very nice when your trying to watch the road , a/f guage and laptop all at the same time. A dyno would make it so much easier

it seems that way.
i put the 440's in but didnt have to adjust the lag time. possibly because they are both stock toyota items, not 100%
on that setting the thing idles perfectly and drives well by the looks of it.
unfortunatly it runs a little lean on full load, but thats probably due to the clamp on the boost cut.
my exams this arvo, so iam going out tonight for a real go

and with the computer lag, thats communicating real time, so thats probably the reason. iam using a printer cable i found

[Yotaholic]

Thanks Dieseltrain ,,, I thought it might be a good plan but it's good to hear someone else agree.

Pato,,, Your lag time might be the cause for a lean top end. I found this injector chart a while ago that shows the various lag times . Try changing your lag time to .97 and note any changes. Hope it helps !

http://www.williams.co.tt/s15/inj_side.htm

Well the 650's are running the 1J smooth . Top end is still rich but i'm workin on it. Boost up to 16psi and it's still pig rich . I ran out of time tonight but i'll get back at it tomorrow.

I just finished wiring the wideband in.so I tried the auto mapping. What a treat !! Set it and forget it if your a lazy sob . It's pissing out so testing was limited. I didnt' get the a/f adapter so I had to rig a connector for the emu ,,, too cheap and too impatiant to wait for the mailman.. I set an a/f target of 13.8 at idle . I then set all values on the airflowmap to 0 . It took over and ran at the selected a/f's .up to 3k . I'll report back when I get more time to run it. .

It's all making a lot more sense now that i'm using it rather than reading about it . Very nice unit !!

[pato]

nah .97 makes it run like crap on idle
on idle it sits bang on 14.7 sooo thats why i think the injector lag good on zero.

when u disconnect your battery. doesnt the unit go all spastic making it hard to start and what not ?????

[pato]

and dude whats the go with that webpage.
its all diamonds with question marks. ???

[thechuckster]

the text is Shift_JIS encoding not unicode or ISO-8859 (like this page is).

assuming you are using firefox? Go to the View menu, select Character Encoding, select More Encoding, select East Asian, select Japanese (Shift_JIS) .. browser should refresh and display it properly.

[Yotaholic]

Oh yeah sry ,,, I had to right click on the page and hit encode in english to view it with IE.

Yes the ecu has a learning curve when you hook the battery back up . Only takes a couple start cycles and a short run then your good to go.

This tuning by seat of the pants method is getting spooky .,, I passed a cop yesterday at 6Krpm in 4th gear: Thank god for divided highways

[pato]

went out tonight for a bit of a go
got it to pretty much exactly where i wanted it
reduced knock to pretty much nothing
got rid of the lump that was plaguin me with the safc
as soon as i came on boost it sat on 11.2 across the board
didnt touch timing just added and subtracted some duty in a nice linear fashion in
89% duty
felt great. more than my old tune of 284 with less boost

then later that night when i was just driving around for some reason it would start coughing at exactly 5800 rpm
would be 89% duty and within 50rpm would jump to 100% duty
did it twice, with me changing nothing
stock ecu chucked a spastic
and now has taken shit loads of timing out of it
car currently runs ok, but duty of around 75%, so waaay down on power.

ive left the battery disconnected for the night hoping to reset the ecu
any ideas ?
iam going to try a mates ecu tomorrow, see what happens

[JP]

so the ECU pulled a bunch of timing out by itself?

Sounds like it went into limp mode to protect the engine.

[pato]

so the ECU pulled a bunch of timing out by itself?

Sounds like it went into limp mode to protect the engine.

yep i recon it did too

it does it all the time. but to varying degrees.
was doing it before with the safc too.

but when i used to put my mates ecu in the car it ran fine.
so maybe the ecu is on its way out

[JP]

pull the lid off the ECU and look for leaking caps. Every 1J ECU I've inspected over the last 3 years has had leaking capacitors.

[pato]

ahh yea.
i did that with my blitz access that went pop but i havent even thought about it for this one
cheers mate

[Z2TT]

At what boost levels does Ignition Timing become an Issue on the 1jz?

[gwilmarlio]

not sure if this has been posted
http://www.innovatemotorsports.com/r...c_tutorial.php

[1JZ-Rolla]

At what boost levels does Ignition Timing become an Issue on the 1jz?

erm..... what do you mean dude?

[chris davey]

Charles: I run a knocksense on the corona. Unfortunately/fortunately I have never actually had any knock to test it's sensitivity. I also have a jaycar super ear amplifier and headphones connected.