Hi everyone

My formal introduction is due but I am saving this for when my project is completed.

I have a 20b Fd. My car and I have a long history and we have travelled a very long journey before we got to where we are.

Anyways, my current problem is "Injectors".

I have 3 x 850s and 3 x 1680s Bosch Injectors (Product code 0280158827), I have Aeromotive Extreme Fuel Pump with one pre (100Micron) and one post (10 Micron) fuel system. The engine is fed with AN10 fuel line and the return fuel line is AN8.

The engine is street ported and the turbo is Gt42 (T6 Divided)- 74mm Front Wheel and 102 rear. The manifold is build by SenzaPari and its a 100% equal runner. The engine management unit is MOTEC M84.

I just got my car dynoed today. We made 550 FWHP at .7 bar of a Boost before the motec started to flash the warning light indicating that, the injectors were flat out. We were like on 90% injector duty cycle.

Now, I am abit shocked and amazed that, the current set up of injector were not sufficient for at least 650rwhp. . We are flow testing the injectors at the moment.

Can anyone advice me as to what could be the possible cause of this? And where I can buy some 2400cc injectors.

Lastly, I heard that, GZ LIMs are out for 20bs and they accommodate 6 injectors instead of 4. Where can I buy them from?

All the help from you guys is much appreciated.

Cheers
Mir

 

Something def doesnt seem right...with just two injectors of each (13B), the 850's and 1680's can flow enough for 550hp, so three of each should def flow more than 550hp...atleast from a spreadsheet point of view.

 

Check your fuel pressure and voltage to the pump. What fuel are you using? Does the filter element has large surface area I.e. can it flow enough to feed the pump at high flow levels? Instalation of pump itself can be issue. I highly doubt that problem is in injectors...

 

Hi mate, I am using a pump gas. It's called here Shell V power. The fuel pump is mounted externally and fed from the fuel sump baffle which is also bought from Aeromotives. One more thing, I am also running Aeromotive Fuel Pump controller. One of the feature of the controller is to control the fuel pump speed in order to avoid Fuel pressure related issues.

I am running out of the ideas

Mir

 

can you meaure fuel pressure while under load (driving or on dyno), if its dropping at high rpm/load you found the cause

 

AFAIK pump speed controller reduces fuel recirculation which limits heat tranfer from engine compartment to the fuel tank and enhances pump life. How is it controled? Is it triggered by some rpm threshold or boost?

You must measure these things - fuel pressure under load and voltage on the pump terminals. You could bypass pump controller to ensure that issue doesn't lie there.

I'm rather amazed that tuner didn't check such basic thing Do you have fuel pressure sensor and datalogs?

 

Yeah I know what you are saying mate. I have a fuel pressure regulator which is controlled by the ECU. I have an in-built datalogger in the Motec ECU.

 

What fuel pressure regulator are you using? It sounds like the pressure is not increasing with boost.

 

I wonder if its possible that this Fuel Pump Controller could possibly be wired backwards. I had a fuel pressure issue on the dyno once and it turned out I wired my fuel pump controller backwards.

 

This is my fuel system right ups!


Brand New Extreme Rotary’s, Custom Primay Fuel Rails-Rail -8
Brand New Extreme Rotary’s, Custom Secondary Rail – Rail -8
Brand New 3 x 850s High impedance Primary Injectors
Brand New 3x 1680s High impedance Secondary Injectors
Aeromotive Eliminator Fuel Pump 11104
Aeromotive Pro Series Regulator 13110
Aeromotive Pre Filter 12302
Aeromotive Post Filter 12310
1x Aeromotive 15642 An10 Port to An12
1x Aeromotive 15610 An10 To An8 Flare Reducer fitting
2 x Aeromotive an8 port to an10 flare union Part number 15641
5x Aeromotive An10 straight hose fitting Part number 15656
1x Aeromotove An8 Port Plug 15618
3x Aeromotive 90 degree couplers An8 to An10 Part number 15690
Aeromotive 11601
Aeromotive 15633
Aeromotive 15612 x 3
12 foot of Braid Fuel Line (suitable for Alcohol, Ethanol,Metho etc) AN10
12 foot of Braided Fuel line(suitable for Alcohol,Ethanol,Metho etc) AN8
5 foot of Braided Fuel line (suitable for Alcohol,Ethanol,Metho etc) An12
Hose Fittings at 90 degree AN12 x 1
Hose Fittings Straight AN12 x 1
Hose Fitting at 90 Degree AN10 x 3
Hose Fitting Straight AN8
Aeromotive 1-18650 Sump with baffle
Aeromotive 1-15642 Fitting
Aeromotive 1-15610 Fitting
Aeromotive 1-15617 tap fitting


Cheers
Mir

 

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