BenMara
Asian Redneck
i cant remember what IC chip it is off hand its been 3 ears since i took electronics class some thing like a certin type of AMP IC chip ill look around
93-94 truck VAF to MAF conversion project (1 Viewer)
- Thread starter semlin
- Start date
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BenMara
Asian Redneck
Could this kit be used to make the simulated VAF curve for the ECU? It seems like it will be something that needs to monitored and adjusted, and will give limited interaction with the actual ECU.
semlin
curmudgeon
- Thread starter
- #124
i assume so but you would have to tune the maf signal before inverting the signal. since the older ecu expects the opposite voltage signal.
we don't really know if we would need any tuning. right now we need something that will exactly invert the voltage. If we then have issues, we could add one of these.
BenMara
Asian Redneck
yea Frankentaco past owner ran one on his SCed taco hmm back to research
I have not followed this thread carefully but a buck-boost converter seems to be what is needed to invert the voltage.
Buck-boost converter
-B-
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If you look at the Split Second site, http://www.splitsec.com/spike/Toyota-MKIII-supra/spikeToyotaMKIIISupra.htm
they show an older supra in the the project cars page that spells out the reverse voltage set up. They list a part number PSC1-005 thats shown on the price list
Price List
and the details are on this page:PSC1-005 Data Sheet
at $373. I think this could be used in conjunction with Landtanks Kit.
Hmmm, maybe a supercharger can be tuned right using the stock ecu from a 93-94......
they show an older supra in the the project cars page that spells out the reverse voltage set up. They list a part number PSC1-005 thats shown on the price list
Price List
and the details are on this page:PSC1-005 Data Sheet
at $373. I think this could be used in conjunction with Landtanks Kit.
Hmmm, maybe a supercharger can be tuned right using the stock ecu from a 93-94......
I think this would do the trick. But getting it to imitate the stock AFM could be challenging. Working out a repeatable calibration sequence would be key to getting good results with multiple installs with no CEL.
$373 is pretty steep, and i need to find a laptop with a serial port, but i might do this.
semlin
curmudgeon
- Thread starter
- #132
agreed. having just read through their literature I am not seeing how you figure that out. I would assume you would start by using the box and software to map the engine with the VAF still in place but that step seems to be missing from the instructions. i am also not clear on whether the machine/software can track o2 sensor signals on a pre obd2 vehicle. the software guide shows an o2 signal being mapped, but I can't see where it comes from.
maybe I will call them.
semlin
curmudgeon
- Thread starter
- #133
someone has done this recently on yotatech for a 22re to a gm map.
VAFM restriction. real or imagined? - YotaTech Forums
VAFM restriction. real or imagined? - YotaTech Forums
semlin
curmudgeon
- Thread starter
- #134
interesting discussion here from the owner of a maf supercharged 4runner. he seems to have liked split second's product although he sure changes horses often.
scroll down and you will find he used a split second maf conversion kit successfully on his truck after first trying a vane pressure converter. he seems to have gotten it working very much to his satisfatction
Fuel Delivery
also, and, this is not really on topic but the boostapump discussion is interesting. he found that the fuel pump could not keep up at high rpm with the superecharger and made the engine run lean, and he demonstrated this with a dyno. food for thought that toyota/kazama maybe did not engineer that right on the LC either.
scroll down and you will find he used a split second maf conversion kit successfully on his truck after first trying a vane pressure converter. he seems to have gotten it working very much to his satisfatction
Fuel Delivery
also, and, this is not really on topic but the boostapump discussion is interesting. he found that the fuel pump could not keep up at high rpm with the superecharger and made the engine run lean, and he demonstrated this with a dyno. food for thought that toyota/kazama maybe did not engineer that right on the LC either.
interesting, reading in the supra forums a cheap approach for upgrading supra mark 3 airflow is to use the VAF from an early lexus v8 which is plug and play on the supra.
I just happen to have one of those
The Supra AFMs are a vortex style unit and not a Vane style. Check compatability on those two. My understanding is that the vortex puts out a varying pulse DC signal.
Semlin, you might contact this guy. That unit should be compatable with our unit and if he would ditch the GM MAF and go with a Toyota sensor like what I did the curves would probably transfer across as well. He would just need to have it in the correct sized chamber which isn't that hard. Between the two groups I think 20 pieces wouldn't be a problem.
semlin
curmudgeon
- Thread starter
- #137
it appear the 80s era supra mark 3 had a vaf. the later mk 4 models i looked at when i was doing research before went to the karman vortex. those are the ones where the obd1 ecu can be replaced with an obd2 ecu as a plug and play.
basically mark 3 supra tuners have already done what we are doing. so far I have found that they do it using a vane pressure converter by HKS that is discontinued, using a lexus v8 vaf and using the splitsec set up with a starting map that splitsec created for the mk 3. I need to do a little more research to see if they do it any other way.
That is incorrect. The Lexus AFM is exactly the same technology as the Mk3 Supra AFM. The difference is the air flow is greater and pulse rate is lesser on the Lexus AFM. The difference is the same percentage as changing the injectors from the stock 440cc to 550cc injectors. With both of those in place you can then safely boost your need for fuel (mainly by using bigger turbo) and the stock engine management can correctly manage fuel trim and keep your engine from eating itself.
This is a CHEAP solution for the Mk3 as compared to adding an external fuel management computer or piggyback to the system along with the needed sensors.
...just ask me how I know
semlin
curmudgeon
- Thread starter
- #140
That is incorrect. The Lexus AFM is exactly the same technology as the Mk3 Supra AFM. The difference is the air flow is greater and pulse rate is lesser on the Lexus AFM. The difference is the same percentage as changing the injectors from the stock 440cc to 550cc injectors. With both of those in place you can then safely boost your need for fuel (mainly by using bigger turbo) and the stock engine management can correctly manage fuel trim and keep your engine from eating itself.
This is a CHEAP solution for the Mk3 as compared to adding an external fuel management computer or piggyback to the system along with the needed sensors.
...just ask me how I know
right, but is the afm a VAF system or vortex system? i have seen it referred to as a vane air flow system in supra forums
