4A-FHE, What is the H? Options

[zonz540]

Ive been looking into the 4A series motors and i came across the 4A-FHE. What does the H denote? Ive seen that Toyota added something new to the fuel injection or changed the fuel injection in some way?
The FHE series head also puts out ~10 hp more than the FE series head and was supposed to be simply a performance tuned ecu from Toyota. I picked up a FHE ecu and it definitely doesnt work on a FE head. The engine will crank, but dies immediately after.
I originally thought timing until i ran across the part about the fuel upgrade. Otherwise, the motors and head are said to be the same? Anybody know anything about this?

[Johnnyny]

this in no way would benefit the 7a

[zonz540]

Its for a 4a, not 7a. Im trying to squeeze a little more power out of an All-Trac Corolla, but it would be a worthwhile mod if it isnt too involved for a 5th gen with a 4a.

[Tom_SS2]

4A-FHE Same as the first generation 4A-FE, only more aggressive tuned for more output. Called an EFI-S engine.

http://en.wikipedia.org/wiki/Toyota_A_engine

Suffix - Feature
A - Valvematic variable lift intake head
B - Twin SU-style side-draft carburetors/After 2000 indicates E85 Ethanol fuel.
C - Carburated / California Emissions Controlled
D - Twin Downdraft carburetors
E - Electronic Fuel injection
F - Economy narrow-angle valve DOHC
G - Performance wide-angle valve DOHC
H - High compression/High pressure charged (example: 2L-THE)
I - Single-point fuel injection
J - Autochoke (Early models) or unknown pollution control
L - Transverse
M - Philippines' market (meaning unknown)
N - CNG fuel
P - LPG fuel
R - Low Compression (For 87 and below octane fuel)
S - Swirl intake (1980s)
SE - Direct injection (1990s)
T - Turbocharged
U - With Catalytic converter Japan-spec emissions
V - Common Rail Diesel Injection (D-4D)
X - Atkinson cycle (typically also indicates a Hybrid engine, as Toyota only uses the Atkinson cycle with hybrids)
Z - Supercharged

http://en.wikipedia.org/wiki/List_of_Toyota_engines

This post has been edited by Tom_SS2: Jun 9, 2010 - 7:56 PM