4aghead Question, is it possible? Options

[dans_st]

Is it possible to do a 4ag (big port) head on a 7afe with the same wiringand map based ECU?
I know that it is better to change out all wiring and ECU, but it it possible to use the wiring that is already there?---the reason I want to do this is I only have my car to drive right now and I drive 20-30min. to work everyday, BUT I think that my 7A head is what is holding be back from getting more power.
Any help and/or even alternative is appreciated- I just need more power.

Also I have just bought and am about to install a b16 manifold w/7a flange,38mm tial wastegate, and a GT3076R ball-bearing turbo.

[dans_st]

About how much $$ does the total head swap cost?
What I was wanting to do was run the 4A head with the 7A harness and map sensors, without changing any if not much of the electrical in the car and just use the mechanical parts(head, cams, cam gears, ect..) while still running a complete 7A harness,MAP & ECU. and make adjustments for the additional air flow with my SAFC-II.

[Kwanza26]

About how much $$ does the total head swap cost?
What I was wanting to do was run the 4A head with the 7A harness and map sensors, without changing any if not much of the electrical in the car and just use the mechanical parts(head, cams, cam gears, ect..) while still running a complete 7A harness,MAP & ECU. and make adjustments for the additional air flow with my SAFC-II.
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What about ignition? ;]

The major difference between the two are the ignition systems. The 7AFE uses a dizzy with an internal coil, while the 4AG uses an external coil. Each are driven slightly different also... gear type versus slot type. If it were easy... people would be doing it left and right... however I will add... do a search for toyotaspeed_90 and read up on his 4AGE swap. He's running a modified 4AFE ecu...

As for costs... the head is rather cheap (25-100 dollars + shipping) but you also gotta consider intake manifold (50-150 dollars), distributor (25-50 dollars), exhaust manifold/header (50-350 dollars), pistons (50-400 dollars)... etc. The 4AG head has a LOT more combustion chamber room... so 7AFE pistons will make like 7 something compression with a 4AG head. If you're planning on going n/a... you have to swap over 4AGE pistons.