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Registered:
March 2005
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MAP sensors?
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Thu, 11 August 2005 11:03
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What is the most efficient way of adding a map sensor and pissing off your AFM. If aftermarket computer systems, what do you reccomend?
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I supported Toymods
Location:
melbourne
Registered:
June 2002
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Re: MAP sensors?
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Thu, 11 August 2005 11:07
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what car is it for? what type of AFM, cause there are AFMs and AFMs, some are bad, some dont matter.
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Registered:
March 2005
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Re: MAP sensors?
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Thu, 11 August 2005 12:20
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Well just considering a 1jz swap into my GZ20-L and trying to do a bit of research before i consider it. I gues the Power FC would proberbly be the easiest. Is there anyway to get around the 1G AFM too?
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Location:
Brisbane
Registered:
May 2002
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Re: MAP sensors?
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Thu, 11 August 2005 23:43
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1JZ has a MAP sensor from factory, so there's that problem solved. 
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Location:
Central Coast, NSW
Registered:
February 2005
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Re: MAP sensors?
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Fri, 12 August 2005 02:18
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The VVT-i one has an AFM doesn't it?
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Location:
c'town, NSW
Registered:
May 2002
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Re: MAP sensors?
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Fri, 12 August 2005 02:28
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| Merudo wrote on Fri, 12 August 2005 12:18 |
The VVT-i one has an AFM doesn't it?
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yep, but i dont suspect it matters as this thread is making no sense anyway.
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: MAP sensors?
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Fri, 12 August 2005 02:39
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you rock rob 
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Registered:
March 2005
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Re: MAP sensors?
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Fri, 12 August 2005 05:57
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well you got to love ignorence. I must have been misinformed, i was told the 1jz-gte had a AFM. Anyway, why isnt this thread going to make sence?
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Location:
brisbane
Registered:
December 2004
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Re: MAP sensors?
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Fri, 12 August 2005 06:44
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power fc woudlnt be easiest im not a fan of them you have to pay through the arse for a map sensor version... theres other plug and plays but usualy there not as good as a full standalone..
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: MAP sensors?
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Fri, 12 August 2005 07:34
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early 1JZ-GTE engines have a 2 bar MAP sensor (14.7psi boost max)
Later 1JZ-GTE engines (VVT-i) have a special type of AFM commonly called a MAF.... AFAIK these are a Karmon Vortex type of afm which produces a frequency output rather than a voltage to derive the engine load.
To replace one of these you need a specialised piece of PROGRAMMABLE electronics which has a mapped output based on a MAP sensor input and RPM.
The most common such device is the [HKS??] VPC - "Vane to Pressure Converter".... im also lead to believe that a Greddy Emanage (with addon MAP sensor) can do the same.
Personally i think these "MAF" sensors are damn good - EXTREMELY accurate at lower engine speeds with a very high output resolution.
Rob - balance has been restored to the sense.
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Registered:
March 2005
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Re: MAP sensors?
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Fri, 12 August 2005 07:42
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ok, pretty much i want to screw over any 'RESTRICTIVE' AFM device so i can increase boost at the push of a button(well turn of a valve). So your saying the early 1jz-gte has a maximum boost pressure of one bar/2bar absolute pressure. Well what can i do if i want to increase boost? Is it the ECU limiting the boost or does the MAP sensor run out of resolution?
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Location:
Brisbane
Registered:
May 2002
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Re: MAP sensors?
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Fri, 12 August 2005 08:43
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Both the ECU and the MAP sensor are limiting factors. If you want to seriously modify your 1JZ, you need to replace them with a programmable ECU and a 3-bar MAP sensor.
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Registered:
March 2005
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Re: MAP sensors?
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Fri, 12 August 2005 09:59
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say if i added a uni chip, would that let me upgrade the map sensor.
Just like to thanks to everybody replying. I know you get alot of these 'what if' question on toymods, its just really helping me clarify things. Thanks agin.
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Location:
Perth
Registered:
May 2003
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Re: MAP sensors?
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Fri, 12 August 2005 12:11
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What exactly does the Unichip allow you to do? Can you change the table the software uses to convert the voltage reading of the MAP sensor into pressure?
The ECU uses a lookup table to determine the pressure based on the voltage from the sensor. If you can change this table to suit the sensor you are using then you should be able to use the ECU safely with a different sensor. I strongly emphasize SHOULD. It all depends on other limits/clips that may be present in the software...
You can't simply convert a MAP into a MAF signal. MAP uses a method called speed density to determine the airflow, this also requires a measurement of manifold temperature.
AFM (air flow meter) and MAF (mass airflow meter) are different names for the same thing.
There are two basic types of airflow meters, frequency type (Karmen Vortex) and analogue type (Hot Wire).
There are factors that influence the placement of the meter but I won't bore everyone with details
There is nothing wrong with using a MAF meter!!!
Be careful if you think you can just swap a larger diameter meter from a different engine onto yours though. Similar to the MAP sensor table, the ECU has a table which is calibrated to use a particular brand/model of MAF meter.
If you are attempting an reasonable improvements just fork out the extra dollars and go an aftermarket ECU, there are so many about for around the $1200+ range I wouldn't waste my time with interceptors and the like.
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Registered:
March 2005
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Re: MAP sensors?
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Sat, 13 August 2005 09:11
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Unichip: "Unichip is a fully programmable engine management system which allows 408 optimized fuel and ignition parameters to be channelled through a vehicle's standard Engine Control unit (ECU) to deliver maximum power, optimized driveability and improved fuel economy." (from unichip website)
I just remember looking at this unit on Planet soarer, and it seemes like a very decent unit. It also alows you to keep your original ecu, which is important due to the ECT transmission etc.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: MAP sensors?
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Sat, 13 August 2005 10:53
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i wouldnt go for a uni-chip... they are an "addon" to the stock ECU which is still limited by the factory sensors... including the 2 bar MAP sensor.
I would just get a Microtech or Autronic if you want to run decent boost.
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Location:
Perth
Registered:
May 2003
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Re: MAP sensors?
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Sat, 13 August 2005 11:04
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I may be wrong but after reading the website I get the impression that the Unichip intercepts the signals to the fuel injectors and ignition and modifies them according to the what ever is mapped in the Unichip. If this is the case then you wont simply be able to change the range of the MAP sensor and use the Unichip with the standard ECU. Best to contact the manufacturer of Unichip about this!
If you are keeping the auto transmission then I can see your reluctance to go to an aftermarket engine ECU.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: MAP sensors?
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Sat, 13 August 2005 22:15
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| earlyrolla wrote on Sat, 13 August 2005 21:04 |
If you are keeping the auto transmission then I can see your reluctance to go to an aftermarket engine ECU.
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i cant...?
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Location:
Brisbane
Registered:
May 2002
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Re: MAP sensors?
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Sun, 14 August 2005 06:36
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Yeah, there are plenty of options if you want to keep the auto. There's no reason you can't leave the factory ECU in place and disconnect it from the injectors and ignition, and run the aftermarket ECU in parallel. That way you get full control over fuel/ignition and the factory ECU can continue to control the auto.
Another option is to remove the factory ECU altogether and run a manual shift controller from MV Automatics. Apparently they work quite well.
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Registered:
March 2005
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Re: MAP sensors?
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Sun, 14 August 2005 07:26
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well fair enough then. I also liked the idea about the Unichip keeping the factory maps, etc that toyota spent years working upon, plus cold starting etc. I also like the ability of the unichip to toggle between two differnt types of fuel curves and ignition timmings ect, but i guess this may be possible with other aftermarket systems. Maybe a A'PEXI power fc would be something to look at. Damn 1bar map sensor, why couldnt it be as easy as pluggig in one that could have more resolution and be done with it.
Ahhhhhhh, ohwell
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: MAP sensors?
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Sun, 14 August 2005 07:36
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what is the point of having two fuel maps??
it's either tuned correctly or incorrectly... same for timing, although you could have a "safe" and "unsafe" map i suppose..
this whole idea of having a "race map" to switch to is a bit.. well... maybe if you had two different fuels 
actually, if you have gas and petrol, it is very useful to be able to switch ignition maps.. but otherwise....
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Registered:
March 2005
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Re: MAP sensors?
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Sun, 14 August 2005 07:42
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two maps have many uses. Differnt fuels ie. if you run LPG and ULP, or say ULP and alchol  . Another, which i would find useful would be to have one 'economy map' and one 'high boost map.' Where on the high boost map you could make it bit richer to prevent detonation etc, and right before where the turbo starts to spool, make uba rich so it spools quicker.
You could do whatever you want.
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Location:
sunny coast, qld
Registered:
October 2002
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Re: MAP sensors?
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Mon, 15 August 2005 04:26
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I agree with oldcorollas. The only time you need 2 maps is when you are running different fuel.
For economy you would be at low load levels so you tune this for good economy and when you are giving it stick you are in a totally different area on the map. You tune this for optimal power. Then you go back to cruising on the economy section of the map.
This is what I am doing now
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