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http://s4.zetaboards.com/lexusaltezzaclub/topic/1148393/1/#new



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3sge Itb
Topic Started: Mar 12 2012, 07:59 PM (4,878 Views)
roman
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Nah, there's no need for two different maps unless you're using different types of fuel.

The ECU determines how much air is coming in, at what rpm, in order to calculate the right amount of fuel and ignition/cam timing advance.

If your car is tuned properly, it will have all rpm/load ranges adjusted to suit, so it will drive as per a standard car.

If you convert to a MAP sensor and have poor sensor resolution (like 0-5v 4bar map sensor, when you're not running any boost) or low vaccum, then you can have problems because you're reducing the accuracy with which the ECU can tell how much air is coming into the engine.
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Higgsy
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haha i have no bloody clue what any of that means.
i know where your going with it, but ill get my buddies to tune it and leave it at that.
from a beams ITB to a 2JZ
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Celica RA45
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dave why did you tune it to map ,all i do is tune it for tps set up vacuum on no 4 cyl is renough for boosted brakes ,as wot there is no vacuum any way.

,throttle respone is much better than std plenum ,japs do it for emissions

and last just make up a airbox to cover them up

as i said my race car is like driving a std motor around the street has vvti, big quads and idles at 900 rpm and with big cams

if you use std ecu keep the plenum if going after market go quads simple ..wish i could send my car over 2 nz and do some testing would be fun etc
looked at your tracks last year when i was touring around the top island for 3 weeks
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roman
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Remember we're not completely flat here. :P

Taupo racetrack is high enough up, that NA cars are noticably slower than at say, Pukekohe or Hampton because the air is thinner.

If you're running TPS only, does it account for temperature changes and atmospheric pressure difference?

That's why MAF is great, takes into account all of that automatically.
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Higgsy
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Celica RA45,Mar 17 2012
12:11 PM
if you use std ecu keep the plenum if going after market go quads simple

so why is a plenum not worth it?
is it not better to get colder air to the quads?
or is the work required to do that not worth the power gains?
from a beams ITB to a 2JZ
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roman
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Nah, definitely have them in a plenum.

He's saying if using standard computer, then you HAVE to have them in an airbox / retaining the MAF sensor.

This is how I had mine setup. Idled and revved out well enough, but never drove it in this configuration as changed back to single throttle before the rest of my car was drivable.
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Higgsy
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ooooh, click.

re-read it, now it makes more sense
from a beams ITB to a 2JZ
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alimac
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http://www.trademe.co.nz/motors/car-parts-...n-458330931.htm
Yellow RS200z 6MT
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silverhelix
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Yeah they seem to be the flavour of the month, yet these are the smaller of the two 20v's so better to wait until the BT quads come up.
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Higgsy
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alimac,Mar 17 2012
07:27 PM

ta for the link.
already had my eye on them from the first auction.
but as helix said, not quite right.
from a beams ITB to a 2JZ
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Celica RA45
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ok to give you a idea of my air box
also dave i run map to atmosphere and it automatically recal diffent above sea levels etc ,well motec does p island is 101 wakefeild is 90 bathurst is 50 so it all changes etc
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and the last pic you can see the map sensor tube going into the air box
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roman
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Aahh okay, makes sense about MAP sensor.

Where do your crank case vent hoses run to? Washer bottle?
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Celica RA45
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yes thats the spare 1 as in washer bottle i also have 1 near the battery
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silverhelix
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Higgsy you still keen, apparently two members have them over at Toyspeed.
I did send you PM but unsure if you got it?
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assassin10000
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roman,Mar 16 2012
05:18 PM
Remember we're not completely flat here.  :P

Taupo racetrack is high enough up, that NA cars are noticably slower than at say, Pukekohe or Hampton because the air is thinner.

If you're running TPS only, does it account for temperature changes and atmospheric pressure difference?

That's why MAF is great, takes into account all of that automatically.


Depends on the setup... but it should if done 'right'. By TPS only he meant fuel/ign maps are setup as TPSxRPM. But there can/should still be maps to compensate for that.

You should have an IAT (just sits in the engine bay near the ITB opening) that should have a seperate map in the ECU to compensate for air temps.

A MAP sensor can either be setup to act as a Barometer (to open air) and compensate for altitude/air density, or the ecu could have both a Baro and MAP sensor (mine does IIRC). Some ECU's IIRC even take a MAP reading before starting (key on, engine off) that it uses for the baro compensation. Which is not completely ideal as if you drive to a different elevation it won't automatically compensate while still running, only after turning the key off and back on.


Andrew
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Higgsy
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silverhelix,Mar 29 2012
01:32 PM
Higgsy you still keen, apparently two members have them over at Toyspeed.
I did send you PM but unsure if you got it?

pm sent

cheers bro.
from a beams ITB to a 2JZ
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silverhelix
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Let me know if you got my PM.
And how you get on ;)
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