FPR Tuning for CAMPRO S4PH

[Jerry_ann]

No wonder it drops to 3.6 Bar when I last checked it.

---------- Post added at 07:12 PM ---------- 6 hour anti-bump limit - Previous post was at 07:01 PM ----------



Hehe. Finally, you manage to get rid of the pitching sound eyh? mine still there. Now got two sound. The sound from the regulator & from my wife nags coz she thinks its annoying too!

Neway, 4.5 Bar is quite high. Is there any difference in your engine character? Am still curious. Been reading thru the net saying high pressure means fuel save & increase performance. I know its fuel consumption is kinda low for sure.

Drex, i've set it to 4.0 bar & yet the sound still there. Will there be any harm or danger to the engine if its set to 4.5 bar especially the piston?

Jerry, update us the status whether still got whistling sound or not. :wavey:

haha..the sound comes again after i post...
but its seldom and not that louder like last time...

however, drex, what will happened if we set the pressure too high? what is the max. temperature our oem fuel rail can stand?

---------- Post added at 07:27 PM ---------- 6 hour anti-bump limit - Previous post was at 07:21 PM ----------

No wonder it drops to 3.6 Bar when I last checked it.

---------- Post added at 07:12 PM ---------- 6 hour anti-bump limit - Previous post was at 07:01 PM ----------



Hehe. Finally, you manage to get rid of the pitching sound eyh? mine still there. Now got two sound. The sound from the regulator & from my wife nags coz she thinks its annoying too!

Neway, 4.5 Bar is quite high. Is there any difference in your engine character? Am still curious. Been reading thru the net saying high pressure means fuel save & increase performance. I know its fuel consumption is kinda low for sure.

Drex, i've set it to 4.0 bar & yet the sound still there. Will there be any harm or danger to the engine if its set to 4.5 bar especially the piston?

Jerry, update us the status whether still got whistling sound or not. :wavey:

haha..the sound comes again after i post...
but its seldom and not that louder like last time...

however, drex, what will happened if we set the pressure too high? what is the max. temperature our oem fuel rail can stand?

 

[drexchan]

The composit fuel rail is good for the maximum pressure your pump can exert, no worry.

 

[fredrick99]

anyone care to share rather my blm can instal the FPR??

 

[BoxCarRacer]

Jerry : Hahaha. Mine also the same after setting it to higher pressure. :argh:

fredrick99 : Yes you can. I think the FPR is universal so shouldnt be any prob.

 

[BoxCarRacer]

Drex : Did like what you teach me last nite. Disconnect the vacuum hose, set to 4.0 Bar then insert it back. I noticed the pressure came down to 3.4 Bar afterwards. I just realize it too that you guys have previously set it to 4.0 Bar when it was first installed :rolleyes: Silly me. The engine behave differently too. Its more steadier & quieter now but somehow i feel that it gives me less power than my "sendiri tune" 4.0 Bar setting :hmmmm:

Jerry, waddya think?

 

[Jerry_ann]

I tune it normally after drove my car for a period, let's say 30 minutes, do it before I switch off my engine. Because when I check the pressure in the morning, the pressure is normally higher than what I have set, e.g. 5 bar or more., Drex, it is normal?

I've used to set it at 3 bar, can feel less power and the engine gonna "mati" when i press the pedal too much during idle, so I set it higher.

For the power, I feel quite good now at 4.5 bar, lesser lag at low rpm compared to OEM.

For the fuel comsumption, I able to get about 9km/litre in city drive, about 1km extra per liter... anyway... this is my 1st tank... will share again next tank...

 

[ftzone]

Setting higher fuel pressure then required thinking it will give you more power is a big mistake! it will cause your injectors to fail pre-maturely, overwork your ECU, fuel pressure solenoid (if any), fuel pump and fuel lines to maintain close loop stoich air fuel ratio.

An exception to this is when you have upgraded the engine and you are running slightly leaner than you are suppose to. therefore by uprating the fuel pressure slightly to overcome this problem. You will still not get the optimum air fuel ratio with just fuel pressure regulator alone.

this is just my 2cents... there is nothing wrong with installing an aftermarket adjustable fuel pressure regulator when it looked good in your engine bay. Happy chinese new year n gong xi fa cai!

 

[ettm_14]

during morning warm up, it is normal to see an increase of 2-3 psi, anything more you should get the pressure gauge checked...

 

[BoxCarRacer]

ftzone : thanks for sharing your thoughts. One question tho. When you mention engine upgrade, to which level you're referring? does open pod filter, lighten crank pulley upgrades is part of it or you're talking about internal parts such as cams, HC pistons?

 

[ftzone]

In my opinion any upgrades which may effect air fuel ratio a retune is required to maximize the modification done. Such as oversized pistons, more powerful fuel pump and performance camshafts.

Air filter & exhaust mod usually makes the air fuel ratio leaner in my experience because most of the fuel are combusted with more air.

 

[BoxCarRacer]

ftzone : I see. I dont have an upgraded fuel pump or cams except for open pod filter & exhaust system. It does make some different when i set it to higher pressure than stock tho.

 

[ftzone]

i'd say not much difference....

 

[st3305m]

in my opinion setting slightly higher fuel pressure wont give any problems to ur injector...da main causes of da failure of seal @ o-ring is da properties of liquid itself (fuel) not da pressure...bad filteration of ur fuel will make da o-ring lifespan shorter....

da idea of installing fpr n set slightly higher pressure is to to maintain da volumetric flow rate of fuel into da injector under sudden load...under sudden load, da opening interval of fuel injector will increse linearly...we can see tat when we press da pedal and da pressure indicated at da gauge increasing linearly vs da load applied...

and (maybe..im not sure bout dis becoz i never had any experience testing car injector....but for large engine im sure bout it) to make da atomization process more efficient due to da oil mist spray is smoother....

i tried quite wide setting for my car..from da stock 3.5 bar until 4 bar...and da best pressure dat i recommend is 3.75-3.8 bar....

 

[BoxCarRacer]

I've been using 4.0 Bar setting for a week now. My fuel consumption is showing 6.6 to 6.9KM/L.

 

[cheeft]

I've been using 4.0 Bar setting for a week now. My fuel consumption is showing 6.6 to 6.9KM/L.

wow thats a really good figure... im driving a gen2 mme n my reading is around 8.9 most of the time... so does it means that after installing FPR the fuel consumption will be better??? and what about performance??? im more towards performance though...

 

[drexchan]

wow thats a really good figure... im driving a gen2 mme n my reading is around 8.9 most of the time... so does it means that after installing FPR the fuel consumption will be better??? and what about performance??? im more towards performance though...

A fuel pressure regulator is always meant for performance gain, and it's the ultimate goal. Better fuel efficiency is a bonus.

 

[mokh]

hi all,

i just want to ask how do u know/check ur fuel consumption? (km/l)

thanks

 

[drexchan]

1. top the tank
2. travel a distance - for let say half a tank
3. top the tank again
4. calculate km/l by dividing the distance you travelled in (2) by the amount last pumped in in (3).

To get accurate result:
1. travel longer distance.
2. refill at the same pump.

Don't ask how to know how far and how much fuel has been filled. Common sense.

Okay, enough off-topic.

 

[mokh]

oh..i see.
i thought u all got some gadget installed to measure it.

thanks btw

 

[wirahybrid]

drexchan, is it normal for my wira 1.6(4g92p) to hav a FC of 7.4km/l wit minor mods like adj. cam pulley, open pod air filter, powerzone extractor n 2" piping??