boost 4agze ecu

[Donor]

hi, im looking at turboing my 4agze and was wondering how much psi i can run before it gets lean on a standard ecu,injectors etc. from what ive read on here its sweet to 14.5 psi. But would I be safe on 12psi with a tdo5 turbo? my car is a 1991 gtz levin. Also are a/f l.e.d gauges fairly accurate?

thanks

[Bazda]

i ran 10psi, 12psi was maxed on my car.

[slighty_sykotic]

My afm gze car was sweet on 12.4, in fact, abit rich, 15psi was way to lean though (only over run i did on the dyno)

--Sykotic

[EVLGTZ]

yeah you should be sweet as.

I use to run 14psi with a td05 on the std ecu and fueling and had no probs

[Donor]

yeah you should be sweet as.

I use to run 14psi with a td05 on the std ecu and fueling and had no probs

thanks everyone, Hey evlgtz did you ever get the a/f ratio checked at 14psi? i dont think mine has a afm? I am going to use an air/fuel gauge as a mate reckons that they are good value, are any of you using them on your cars? would it be safe to judge a/f ratio by one of these gauges? are they quite accurate? or should I get it checked on a proper machine?

ta

[aesc]

I'd say EVLGTZ wouldve had his AF ratios checked, doesnt look like someone who would do things half arsed.

The AF ratio gauges you buy (autometer/autogauge) are not taht accurate as they run off the signal from the factory o2 sensor, I wouldnt trust one. Prob best to get the ratios checked on the dyno with a wide band sensor

[Ako]

"Not that accurate" = understatement of the year .

They only show a true signal from about 14.5:1 to 14.0:1, anything richer than that and they just flick round to "fully rich".

Absolute waste of time and $200+ . If you're going to do something, do it properly, not with a crap little gauge on a factory narrowband sensor.

[EVLGTZ]

yep waste of time. about as accurate as timing a quartermile with a calander.

Yeah your car wont have AFM, should be a MAP sensored ZE in that model

[evil_si]

i ran an ht18 combo on my ae101, when i dyno'd it 11psi was the max safe a/r on the standard fuel system and ecu.

there are plenty of shops around with widebands,i know of a few in auckland that will do a/r checks for around $50

[Donor]

ok thanks guys, I can get a wgate with a 12psi spring so ill just run the next one down to be safe - cool. Is wideband an instrument that measures the fuel air mix off the factory oxygen sensor?or is it the one that goes in the tailpipe?.

ta

[Bazda]

I bought this one off trademe made by FGS Technologies, and just running it off a normal o2 sensor, it seems to work fine its just a little slow.
But if ur on boost in a high gear it will read ok as ur rpms dont go up too fast.

I checked it on the dyno also and when the car was rich (about 10.9:1) it would read on the rich side of the scale and when it was normal (12.0-12.5) it would read near the middle of the scale. And if I accidently left my extra injector plug off then it went way off the lean scale and stopped me from blowing my car up

[MetalupYoAss]

Jaycar O2 digital guages are the best value for narrowband sensor, they are accurate as, and cheap.

[Donor]

I checked it on the dyno also and when the car was rich (about 10.9:1) it would read on the rich side of the scale and when it was normal (12.0-12.5) it would read near the middle of the scale.

on the topic of fuel air ratios what would be the best area to be in on boost?, 14:1? what would be the rich ratio and a dangerously lean ratio zone etc etc???how did you know it was 10.9:1 Bazda is that using a wideband?

cheers

[Bazda]

cos it was on a dyno using a Autronic meter that costed $3k

i would say anything over 13:1 is getting way too lean.
12.5 is where u wana run a turbo car

[dash]

widebands and dynos become affordable, all of a sudden anything else is useless huh ?
Around 10 years back, narrowband O2 volts were the lifeline for tuning our buicks.
This enabled stock unopened 100+k mile pushrod turbo 3.8L v6s to move full weight daily driven airconditioned heavy street cars to 10sec ETs, without nitros using chipped GM delco/stock ecu! Acceleration was absolutely mind-boggling.... even using MT ET streets on asphalt.
How many cars today with built motor$$$, standalone$$$, widebandd$ and dyno tuning can match it ?

[evil_si]

as technology becomes more affordable why not make the most of it, a wide band is more accurate over the range than a narrow band. and a dyno is easier and safer to make the measurements on

look at the colour tune plugs, 20years ago they may have been the biz, now its slow and inefficient

[dash]

the same can be said for using an old pushrod v6 as a powerplant choice, eh. It doesn't really care, does it.
By all means, embrace 'new technology' if it winds your clock, but in no way does it dictate the success of your results. There are options.
You'd be hard pressed to find a simpler, cheaper path to a comfortable 10sec ride, as the v6 example I gave... All d.i.y. tuned by enthusiasts using old equipment & 'junk' tuning methods. That is what I was getting at. Works admirably if you have the smarts. Call it what u want.
Fact is, folks spend alot more to accomplish far less.
My preferred l.e.d./narrowband meter is the $45usd dawes a/f meter. Simple well thought out design, good price. It works

Not at all interested in an arguement. My counterpoint was that smart folk have done extremely well with narrowbands and other 'inferior', less costly tuning methods.

[peas]

Are there any injectors that will sort out high boost leaning out issues? I was looking at 15-16psi on my TD05. I was hoping that some injectors from another model would be a simple enough fit and that the factory ECU could run them. Ive been told that the factory cut is at 18psi on the ECU?? Obviously the rest of the fuel system wouldnt handle that but a Supra (more "advice"? ) fuel pump and bigger injectors...?

[Bazda]

Are there any injectors that will sort out high boost leaning out issues? I was looking at 15-16psi on my TD05. I was hoping that some injectors from another model would be a simple enough fit and that the factory ECU could run them. Ive been told that the factory cut is at 18psi on the ECU?? Obviously the rest of the fuel system wouldnt handle that but a Supra (more "advice"? ) fuel pump and bigger injectors...?

u cant really just stick bigger injectors in it wotn run nicely.
factory cut i thought was 14-15psi on the map sensor models as thats where my mates one was.

run an extra injector just before the throttle body is ur best bet.
http://forums.toyspeed.org.nz/viewtopic.php?t=45325