Fuel pump options

[panda_tureno86]

Hey guys just wondering which fuel pump is interchangeable with the AE86s
It's stock.

[Roger]

a walbro wil do the job.
just ebay-it

[Project D]

You don't need a big fuel pump, something near 100lph will do the trick just fine.
I think you can use one from honda car without modification (maybe the plug...)

Why do you want to change your pump by the way ?

For people who need a 255lph pump (if you don't have a big turbo setup with 250+ hp, you dont need this !) Bosch 040 is way better than a Walbro shit on ebay...

[Bean]

Project D Wrote:For people who need a 255lph pump (if you don't have a big turbo setup with 250+ hp, you dont need this !) Bosch 040 is way better than a Walbro shit on ebay...

true but still overkill on almost any 4age.

just to put it in perspective a 100lph pump will suport 240hp easily and on top wont heat the fuel unnecessarily due to pumping silly amounts of it back to the tank.

[oldeskewltoy]

A decent rule of thumb on fuel pumps.... 1 liter can support 2.5 hp...... BUT That is without considering wear. IDEALLY... figure about 2hp - 2.2hp per liter when wear is part of the calculations

The stock oem fuel pump is about 84 lph

9 out of 10 people who own a Walbro 255.... are just plain idiots

[Ivan141]

RX7 FC, Supra MA, MR2 etc etc.. most will fit with minor difficulties.
I used an FC pump myself when my original pump died.

[Project D]

Bean Bandit Wrote:just to put it in perspective a 100lph pump will suport 240hp easily and on top wont heat the fuel unnecessarily due to pumping silly amounts of it back to the tank.

True on NA car, but on turbo you have to consider that the flow drop with the pressure. A little bit too big pump is always better than run lean on boost I think.

[[Walaki]D`Lair]

If a stock pump makes 84l/h it is enough for about 200hp new. Could an engine loose a few hp becouse of a 27 years old fuel pump?

And BTW. Could I use a Honda S2000 pump in a stock AE86 petrol tank?

[Project D]

Yes you can lose few HP if the pump have lost a lot of flow.

For 200hp I would upgrade the fuel pump, especially if it a 27 years old pump

The easy rule to size your fuel pump:

Flow of your injectors x number of cylinders x 0.06
(0.06 -> x60: minute to hour, /1000: cc to liter)

Exemple for a blacktop:
295cc @ 3bar
295 x 4 x 0.06 = 70.8 l/h

So the minimum flow of your fuel pump should be 71l/h @ 3bar
(Personally I prefer to add 20 to 30% to this number as a safe margin)

[[Walaki]D`Lair]

Project D Wrote:Yes you can lose few HP if the pump have lost a lot of flow.

For 200hp I would upgrade the fuel pump, especially if it a 27 years old pump

The easy rule to size your fuel pump:

Flow of your injectors x number of cylinders x 0.06
(0.06 -> x60: minute to hour, /1000: cc to liter)

Exemple for a blacktop:
295cc @ 3bar
295 x 4 x 0.06 = 70.8 l/h

So the minimum flow of your fuel pump should be 71l/h @ 3bar
(Personally I prefer to add 20 to 30% to this number as a safe margin)

Well...I dont think fuel pump can still make that much after all these years...