18rgeu from airflow to map sensor

[dale30]

Anyone know how to do such a thing.
I want to graft the injection onto a quad throttle body so cant use air flow meter.

BTW..Its a speedway car not for the road so driveability isnt that important.

[RA35GT]

Find a cheap aftermarket computer? Or just use carbies?

[dale30]

must be a way to do it..theres always a way. .i hope

[Duk]

Anyone know how to do such a thing.
I want to graft the injection onto a quad throttle body so cant use air flow meter.

BTW..Its a speedway car not for the road so driveability isnt that important.

There is technically nothing stopping you from using an AFM and quad TB's. You would need a plenum chamber that breathes through the AFM. The very different accoustic characteristics of the quad TB's would require some decent tuning of fuel and ignition timing, though.

Look at a http://www.mapecu.com/ but really, money spent on that could have you well and truly into a Megasquirt set up and do away with the archaic Toyota ECU.

[andrew_mx83]

sure you could run a plenum and AFM, but what would be the point in the ITB's then if you are going to create a bottleneck before them?


i have looked into this many many times, and aftermarket ECU, carbies or LPG are your only options. the signals are not compatible to use a stock ecu.

i am currently running impco LPG on my daily 7m with no AFM, about to convert to twin 50mm TB's, and the race car will be running triple dellortos.

[Duk]

sure you could run a plenum and AFM, but what would be the point in the ITB's then if you are going to create a bottleneck before them?

Have a look at a V8 Super car, F1 or the McLaren F1 road cars (and more) they use a common plenum chamber on their multi TB engines. In fact, most/all tuned NA engines that are really performing, especially over a decent rev range, will use a plenum chamber.

[o_man_ra23]

Do you have a class restriction which prevents you from using an aftermarket ECU?? If not, then dump the factory unit, and wire in a fresh and shiny new unit. Megasquirt units are good, but if you aren't into tuning it yourself it could be very costly to have tuned. Adaptronic make good self learning units for a reasonable price, and shouldn't be difficult for any good tuner to learn the software on.

If you have a class restriction which prevents you from changing ECU, you are in a world of hurt, and creating a plenum and using the stock AFM is likely your only option. At which point, you need to question the benefits of quad throttles.

[e30-323ti]

Universal AirFlow Converter looks like it could do what you need assuming the AFM & MAP sensor have the same 5v range, will still take some 'tuning' to get it right (which obviously has it's own dangers).

[dale30]

had a quick look..does that replace the afm??

[dale30]

Had a look on ebay..so much to choose from????? Dont mind putting a kit together.

Which one should i be looking at buying..

[dale30]

Had a look on ebay..so much to choose from????? Dont mind putting a kit together.

Which one should i be looking at buying..

red label blue label green label...damm i hate choice...Someone tell me which is right

[andrew_mx83]

Have a look at a V8 Super car, F1 or the McLaren F1 road cars (and more) they use a common plenum chamber on their multi TB engines. In fact, most/all tuned NA engines that are really performing, especially over a decent rev range, will use a plenum chamber.

yeah i know this, and if you are cluey enough with the math maybe you can get it right, but im sure these have huge great intakes at the start of the plenum also.

have you looked at the square area of an AFM? major bottleneck! i just question what is the point in increasing throttle area if you are going to choke it further up the line?

[dale30]

What about using the AFM like a TPS and working the flap manually.??? Bearing in mind that ot will spend 90% of its time at WOT...

[Duk]

What about using the AFM like a TPS and working the flap manually.??? Bearing in mind that ot will spend 90% of its time at WOT...

That's probably the simplest. As long as the TPS is a variable 1 with the same resistance characteristics as the AFM, then use a voltage modifying thing like the fourteen point seven for fine tuning. Just make sure you get the temperature sensor out of the AFM housing and stick it in the air stream.
Can you post a link for the Ebay things you were looking at?

[thechuckster]

won't work - at WoT at low revs, you get/need low air flow, whereas at high revs you get high air flow- even tho the throttle (in your case linked to the pedal) is in the same place.

Get a cheap 2nd-hand Microleb or Megasquirt or other low-end ECU. I'd suggest the megasquirt as there are folks who have done this engine and the user community shares configurations. You can use the existing dizzi and trigger wheel, and also the stock coolant temp sensor. Air-temp sensor can come from any toyota that has a separate IAT sensor in the airbox (or simply grab the coolant and air temp sensors from a V6 commode).