1HD-FT tuning (1 Viewer)

[NielsC]

Hi all,

I have been told by a reputable diesel tech that tunes alot of toyota diesel engines that there is some sort of device , i believe electrical, that limits the power output on the 1HD-FT engines in first and second gear.
Me being a DIY kind of guy want to disable or remove this myself.
Anyone knows what he is talking about ? He won't tell me because he says it is his bussines

thanks

 

[troopie]

Could be that he means the BACS or SICS systems, i always mix those two up... do a search on here for those two systems and you'll see.
I think the diesel specialist is "G. O." ?

 

[mudgudgeon]

1HD-FTE (electronic fuel injection) definitely has a switch on the gear box that limits power in 1st gear.

1HD-FT has full mechanical injection. I don't think there is anything to limit power.

BACS reduces fuel at high altitude
SICS reduces fuel while starting the engine. Once the engine is running SICS no longer does anything

 

[NielsC]

Thanks,
I found it in the manual.
Sics it is indeed!
On the 1HDT there is a switch on the manual gearbox.
Not too sure about the 1HDFT as mine is an automatic.
I disconnected it and hooked it up directly to a vacuum source. I can't really feel any difference so I do not think it is used on the auto ones.

 

[Antony]

It's on the block side of the pump. Vacuum on is normal fueling. Off is reduced. You can adjust the screw on it so it never see's reduced fueling.

 

[NielsC]

Yes, i hooked it up directly to a vacuum source so it never reduces fueling.
I did some more testing today and noticed that in the high rpm range there is a lot more power. Whereas EGTs maxed around 520 degree celsius flat out on long piece of flat road they now climb upto 560 and higher and theres quite a bit more power.

 

[phatman81]

I'm looking for a shop which specializes in 1HD-T / 1HD-FT engine mods .. Oil coolers, Oil Bypass, Transmission Fluid coolers, Intercoolers, High fin count 15-30 lb boost turbos ..

 

[Sonofaskipper]

I'm looking for a shop which specializes in 1HD-T / 1HD-FT engine mods .. Oil coolers, Oil Bypass, Transmission Fluid coolers, Intercoolers, High fin count 15-30 lb boost turbos ..

Maybe you should drive yours first for a while and see how you like it before going full tilt on the mods. Tor Fab in Everett WA has extensive experience with diesel LC.