The Official 1HD-T/FT Fuel Pump Mod Tuning Thread

Joined
Jun 27, 2007
Messages
484
Location
Calgary
Diameter is 10.9mm.

Can 4130, 4140 be hardened? Standard pin is case hardened and polished
I think this message confirms the 10.9mm diameter for the stock 1HD-T

I don't recall if anyone has confirmed that 1HD-T and 1HDFT pins can be interchanged.

can anyone confirm?
 

mudgudgeon

SILVER Star
Joined
Dec 17, 2007
Messages
5,951
Location
Across the pond, and upside down
Here is the stamp on my pump. so it being a VE6/12F1 means its a 12mm pump does that mean I need the 11.9mm one?

12mm refers to the diameter of plungers on the distributive head.

AFAIK all HD-T series Denso pumps use a 10.9mm aneroid pin, but would be best to confirm with Trundles before ordering.

The larger pins are for Bosch VE pumps
 
Joined
Jun 27, 2007
Messages
484
Location
Calgary
12mm refers to the diameter of plungers on the distributive head.

AFAIK all HD-T series Denso pumps use a 10.9mm aneroid pin, but would be best to confirm with Trundles before ordering.

The larger pins are for Bosch VE pumps
Thanks I actually took mine out and measured the diameter. It’s 10.9mm

When I pulled mine out the grind looked not right to me. its as if half of it was ground down at a 90 degree half the pin is missing
7B3DEBC6-159F-4219-939F-60FDC5495F20.jpeg


84BFAF03-B855-453F-8876-2CAF88B617B8.jpeg


25DDC40C-0D82-45B5-9FD0-C28A30EF1C4F.jpeg


7C4102C4-099D-4F85-ABDC-DDE74C5B95F3.jpeg


4FC97F40-244A-4D07-BEBA-A52FED37FBB2.jpeg
 

mudgudgeon

SILVER Star
Joined
Dec 17, 2007
Messages
5,951
Location
Across the pond, and upside down
Joined
Jun 27, 2007
Messages
484
Location
Calgary
Hi, guys seeing if there's any benefit to running High flow injectors +30% aka Gturbo and others. VS the stock standard configuration.

any benefit to running high flow on a stock VE pump or even with an upgraded fuel pin.

or what should be expected with VE pump upgrades?
 

Tapage

Club 4X4 Panamá
Joined
Apr 4, 2003
Messages
23,645
Location
Panamá
Website
www.4x4panama.com
I never saw a benefit .. stock ( healthy ) injectors are very capable .. with a healthy Fuel pump, proper tunned fuel pin I had plenty fuel available across the range ..
 

mudgudgeon

SILVER Star
Joined
Dec 17, 2007
Messages
5,951
Location
Across the pond, and upside down
Hi, guys seeing if there's any benefit to running High flow injectors +30% aka Gturbo and others. VS the stock standard configuration.

any benefit to running high flow on a stock VE pump or even with an upgraded fuel pin.

or what should be expected with VE pump upgrades?

Ideally, you want pump and injectors to be matched.
Running a high flow injector without increasing pump /injector crack pressures doesn't make sense to me.

More flow through a nozzle will see lower injection pressure. Try adjusting flow through the nozzle of your garden hose. If the hose tap/faucet is turned on full flow, More flow through the nozzle = less pressure, and coarser spray. Less flow through the nozzle = more pressure, finer spray.

Later model HD-T series engine updates (late HD-T, HD-FT, HD-FTE) all had increasingly higher injection pressures to atomize fuel better. Finer atomization means better efficiency, more complete fuel burn, more power, cleaner combustion.

If your pump is customised to produce more flow, AND more injection pressure, then high flow injectors make sense provided the address set to work with the pump
 
Joined
Jun 27, 2007
Messages
484
Location
Calgary
Ideally, you want pump and injectors to be matched.
Running a high flow injector without increasing pump /injector crack pressures doesn't make sense to me.

More flow through a nozzle will see lower injection pressure. Try adjusting flow through the nozzle of your garden hose. If the hose tap/faucet is turned on full flow, More flow through the nozzle = less pressure, and coarser spray. Less flow through the nozzle = more pressure, finer spray.

Later model HD-T series engine updates (late HD-T, HD-FT, HD-FTE) all had increasingly higher injection pressures to atomize fuel better. Finer atomization means better efficiency, more complete fuel burn, more power, cleaner combustion.

If your pump is customised to produce more flow, AND more injection pressure, then high flow injectors make sense provided the address set to work with the pump
What exactly needs to be done to increase flow in the pump. Is this something someone can diy with the right tools and parts?
 

mudgudgeon

SILVER Star
Joined
Dec 17, 2007
Messages
5,951
Location
Across the pond, and upside down
What exactly needs to be done to increase flow in the pump. Is this something someone can diy with the right tools and parts?

You're beyond the realm of DIY for that.

Once tuning maxes out the original pump's capabilities, it needs to be upgraded by a pro and tested on a flow bench.

Depending on what pump you have, increasing flow and pressure will be through changing distributive head and plungers from 11 to 12mm
 
Last edited:
Joined
Jun 27, 2007
Messages
484
Location
Calgary
Sounds good looks like I’ll be saving for some pump and injector upgrades in the near future.
 
Last edited:
Joined
Jun 27, 2007
Messages
484
Location
Calgary
I never saw a benefit .. stock ( healthy ) injectors are very capable .. with a healthy Fuel pump, proper tunned fuel pin I had plenty fuel available across the range ..
in your experience, early 1hd-t injectors are good until what HP range?
 

Users who are viewing this thread

Top Bottom