The Official 1HD-T/FT Fuel Pump Mod Tuning Thread (7 Viewers)

[ForealBoreal]

G or BB

Any thoughts on upgrading the spring of the 1hd-t diaphragm to a 1hd-ft one? I am curious about playing with a more advanced high boost fuel pin.

 

[Dan_J-spec_fj62]

G or BB

Any thoughts on upgrading the spring of the 1hd-t diaphragm to a 1hd-ft one? I am curious about playing with a more advanced high boost fuel pin.

I just ordered my Grunter Extreme from Graeme and he suggested getting the 1HD-FT aneroid pin and spring if I can find them. Hopefully my new turbo will be here soon...

HTH,

Dan

 

[loucaojr]

Subscribed!!

Thanks for all the knowledge sharing and tutorials! I feel like last night I had a graduation in Fuel pumps!!

 

[AllenTenT]

Id like to remove acsd and reset timing any of you set the timing yourselves with the dial indicator wouldnt mind a how to vid

 

[ForealBoreal]

Is there any way to figure out the correct plunger stroke for a pump if you know nothing about it?

 

[wrongway around]

Don't think anybody has done that yet, on a 1hdt pump at least. Be nice to get that program. Why do you need so much fuel? You can buy a larger head and plunger for big fuel demands. To bad nobody is making custom ground came plates for stroking the plunger. BB should make them for the complete package.

 

[yotahed]

Another member brought up a possible cam plate mod that I'll be researching with a cummins plate or another 6 cyl motor with a tad more displacement than 4.2L. A custom grind is probably needed, but I can measure specs when I rebuild the next one at work.

here's a VE mod thread from http://www.dieseltruckresource.com/dev/sitemap/ve-pump-advanced-level-t172432.html

pretty cool first post there.

 

[yotahed]

Is there any way to figure out the correct plunger stroke for a pump if you know nothing about it?

The numbers on the side of the pump tell all. If you search what that specific pump was used on, you can get the spec from the engine manual for the vehicle it was off. Granted, the same pump may be used on a few different applications, but pump #'s usually pretty application specific.

or send me the numbers and I can look it up on the Bosch/Denso spec sheets. i guess that'd be the easy way out eh?

cheers

 

[bomber73]

1hdt fuel pump rod

Hi guys new in here was reading past posts about people having trouble getting the fuel pump rod back in if they happen to pull it out the one with the diaphragm on it on the front of the pump near the throttle control onto of the pump is a 17mm plug fitting remove that plug fitting there is a small spring behind it .Once that is removed look inside where the fuel rod goes and you will see a small pin laying horizontally push that pin gently towards front of pump now just refit fuel rod dont forget the spring and washer once thats back in refit the plug fitting and spring dont over tighten the plug and make sure the copper washer is still on the plug

 

[ForealBoreal]

The numbers on the side of the pump tell all. If you search what that specific pump was used on, you can get the spec from the engine manual for the vehicle it was off. Granted, the same pump may be used on a few different applications, but pump #'s usually pretty application specific.

or send me the numbers and I can look it up on the Bosch/Denso spec sheets. i guess that'd be the easy way out eh?

cheers

Its all good.
My 12mm 1hz pump is custom done.
timing .70mm to .76mm, injectors are 100psi above stock 1hz pressures with the same nozzles.

Glad to know we have an injection guy on mud now.

 

[ForealBoreal]

Quick question.

Is it better for me to set my timing to the lower or upper end of the range given.
Would it truly make a difference?

 

[yotahed]

I would hit the upper range and drive a few tanks and see if its what youre after. You could Even experiment going up in .02mm increments and see how it reacts. The Cummins guys are crazy with their timing. They bump it a tooth on the gear(around 12deg?) Kinda redneck s*** but it works. Lol

You could even start in the middle and work your way up and see where you like it.
I guess the best would be a nice balance in starting and mileage and power...
But I can't see the higher spec being a bad thing. Usually the lower spec is for the emmisions conscious folk.. Lol
Cheers

...via IH8MUD app

 

[yotahed]

Re: cam plate grind..
Talked to the boss, and he said he's not heard of anyone doing a custom grind on a plate in 20+ years in the business.... But I would say its a damn interesting possibility if you could figure it out.

...via IH8MUD app

 

[ForealBoreal]

Do you figure it will honestly make a huge difference in terms of fuel economy / power from say .7 to .76?
Even .73 to .76?

 

[yotahed]

Different engines react differently. I don't have a 1HZ or DT to play with, so I don't know.
However, for example, with the mitsu 4d56t, you can rotate the pump full advance or full retard and it makes little to no difference in power or economy, but on other engines the difference is night and day with the smallest advance or retard adjustment.
Like I say, experiment . if it runs like s*** at a certain position, back it up and find your sweet spot. Too little advance and you'll know right away on a cold start. Itll billow white until it warms up a bit.
Alternatively, too much advance and it will have quite a loud diesel rattle.

 

[dadinabarrel]

This thread has been great, but cold since Dec 2010 I hope there is someone listening....

Can anyone tell me which 11mm & 12mm VE pumps will fit my 95 HZJ75 1HZ?

 

[dags]

KOC japan

 

[CycloSteve]

View attachment 876242
KOC japan

More details needed on this one...for which motor and boost, and where does one buy such a beauty?

 

[dadinabarrel]

View attachment 876242
KOC japan

Oh man, that's one sexy pin. What does it fit and where do I get one?

 

[Knudsen6x6]

Fule pins.

When I saw the picture yesterday, I looked around and found:
http://www.mandhinc.net/DPD-1-F.html

Someone who can explain this part ?
http://www.mandhinc.net/DPD-3-D.html

Greetings from Sweden
Henrik