Injector / Fuel Pump Installation Time

[Fletch]

A couple quick questions.

How long did it take some of you to install the injectors and/or what is the book time to have it done (going to have plugs done at same time)?

How long does it take to install the walbro fuel pump (I really want to have the FPR mod done simultaneously)?

I've been sitting on these parts for a few months and would like to upgrade the rest of the fuel system. Unfortunately, I blew my front bank knock sensor (before I had Jim's kit) when I put the pulley on and have been running off the rear bank since. Perhaps I should have the knock sensor replaced also???

Thanks.

[Astro]

Man, I'd like to know too, because I'll be doing the same soon. BTW, you'll most likely have to take the s/c off to get to the rear spark plugs. It's pretty tight back there.

[lazyboyz69]

spark plugs i changed all of them except two in the rear, i can get my hand back there but i'm just not strong enought to pull them out.....

walbro fuel pump took me about 3 hours, i didn't know what i was doing but i got it done it was pretty damn easy.

[that1mexguy]

took me about 2.5 hrs for the fuel pump as well since i had no clue what i was doing... the other stuff. The plugs also took me like 3-4 hrs since it was hard to reach, but with the right tool combination, you should be able to reach them... i'm having a shop do the injectors

[SpeedSTARs]

If your going to swap out the fuel pump, you mind as well modify the fuel pressure regulator. I think JoeB in some previous thread show the DIY on how to accomplish this task. Basiclly it is done by means of pressing in the valve in the regulator to increase the fuel pressure in the overall fuel system... I myself am looking for future replacement to the stock injectors. You can feel a noticable difference just from changing out the pump and doing the mod on the regulator. Anyway, I wis you luck on your project Bro.

[Astro]

If your going to swap out the fuel pump, you mind as well modify the fuel pressure regulator. I think JoeB in some previous thread show the DIY on how to accomplish this task. Basiclly it is done by means of pressing in the valve in the regulator to increase the fuel pressure in the overall fuel system... I myself am looking for future replacement to the stock injectors. You can feel a noticable difference just from changing out the pump and doing the mod on the regulator. Anyway, I wis you luck on your project Bro.

Do NOT do the fuel regulator mod! This is JoeB in his last post about it...

July 04, 2005

Hmmm, I posted a reply to this a while ago but somehow it didn't make it. Someone just brought this thread to my attention and I wanted to follow up on it.

I would NOT recommend you do this mod. Within about 6 months after doing this mod, I started having trouble with my fuel pressure regulator. It was difficult to trouble shoot because unlike most pressure regulator problems where they just stop holding pressure all together, mine started varying. I didn't notice until I got a fuel pressure gauge. One time the car would be at 59 psi exactly, the next it would be at 38psi under the same condition.

As you could imagine, that makes it very difficult for the car to run right because now there is a substantial change in fuel volume in the chamber. I told my mechanic about it and he said that was common to have early regulator failure after doing that mod. I'm sure there will be varying results and some people will say it works fine while others don't even realize problems they are having is due to an inconsistant or changed fuel pressure. I'm just sharing my experience and recommendation.

If you think about it, raising the fuel pressure is just a bandaide to getting more fuel out of the injectors (more pressure behind the same size opening =more fuel). With the right sized injecors, this mod doesn't help. In reality, you want the stock pressure on the low end or even a little less since we are using larger injectors. Then using a pressure rising FMU, have more pressure on the top end to match the opposite pressure from boost (air opposing it). The only problem with that is a rising rate FMU requires a return fuel line and we don't have that. I've decided to stick with the stock regulator and just use larger injectors and it is working great for me. Sorry this didn't show up when I first posted it. -JoeB

Fuel Pressure Regulator Mod - FREE -link

[SpeedSTARs]

If your going to swap out the fuel pump, you mind as well modify the fuel pressure regulator. I think JoeB in some previous thread show the DIY on how to accomplish this task. Basiclly it is done by means of pressing in the valve in the regulator to increase the fuel pressure in the overall fuel system... I myself am looking for future replacement to the stock injectors. You can feel a noticable difference just from changing out the pump and doing the mod on the regulator. Anyway, I wis you luck on your project Bro.

Do NOT do the fuel regulator mod! This is JoeB in his last post about it...

July 04, 2005

Hmmm, I posted a reply to this a while ago but somehow it didn't make it. Someone just brought this thread to my attention and I wanted to follow up on it.

I would NOT recommend you do this mod. Within about 6 months after doing this mod, I started having trouble with my fuel pressure regulator. It was difficult to trouble shoot because unlike most pressure regulator problems where they just stop holding pressure all together, mine started varying. I didn't notice until I got a fuel pressure gauge. One time the car would be at 59 psi exactly, the next it would be at 38psi under the same condition.

As you could imagine, that makes it very difficult for the car to run right because now there is a substantial change in fuel volume in the chamber. I told my mechanic about it and he said that was common to have early regulator failure after doing that mod. I'm sure there will be varying results and some people will say it works fine while others don't even realize problems they are having is due to an inconsistant or changed fuel pressure. I'm just sharing my experience and recommendation.

If you think about it, raising the fuel pressure is just a bandaide to getting more fuel out of the injectors (more pressure behind the same size opening =more fuel). With the right sized injecors, this mod doesn't help. In reality, you want the stock pressure on the low end or even a little less since we are using larger injectors. Then using a pressure rising FMU, have more pressure on the top end to match the opposite pressure from boost (air opposing it). The only problem with that is a rising rate FMU requires a return fuel line and we don't have that. I've decided to stick with the stock regulator and just use larger injectors and it is working great for me. Sorry this didn't show up when I first posted it. -JoeB

Fuel Pressure Regulator Mod - FREE -link

Thanks Astro for clearifing this item. It seem to work for me for the meantime. Then again, I don't have upgraded injectors yet. Thanks again for finding the link from JoeB's last post on this topic.

[Alex(AUS)]

- Walbro pump - around 1 hour (max).
- Fuel injectors - around 2 hours (if you have done it before). You need to pull off the charger.
- Dont do the regulator mod.
- Fix the knock sensor - it will take many hours (4-6) (you need to remove the lower intake ... remember to drain the coolant). Easier to change injectors with lower intake off.
- You need to remove the charger to change plugs unless you are either superhuman/very small or both.
- Tune the car properly.

Alex

[Fletch]

Thanks for the replies everyone, I did not know the dangers of the FPR mod.

I'm not totally sold on replacing the knock sensor though. I don't know quite enough about OBDII to know if the knock sensor has any fuel trim or timing input. My understanding was that the MAF and upstream O2's had the biggest impact on fuel trim and knock sensors were really just there to protect the engine. More of an on/off switch than continually varying the timing???

I think I am running a little fat up top. Sometimes when I get on it, it blows brown/black smoke out the tailpipe, which I think is extra fuel.

[Alex(AUS)]

Thanks for the replies everyone, I did not know the dangers of the FPR mod.

I'm not totally sold on replacing the knock sensor though. I don't know quite enough about OBDII to know if the knock sensor has any fuel trim or timing input. My understanding was that the MAF and upstream O2's had the biggest impact on fuel trim and knock sensors were really just there to protect the engine. More of an on/off switch than continually varying the timing???

I think I am running a little fat up top. Sometimes when I get on it, it blows brown/black smoke out the tailpipe, which I think is extra fuel.

Hi Fletch,

The knock sensors do control timing and fuel. Our engines self-adjust/learn by continuously refining the fuel/timing curve based on octane levels and environmental conditions. So, if you have a bad sensor, the car may adjust its timing/fuel map to degrade performance even though this may not be required.

Alex

[sleepin2000]

This is kind of on the same topic. Do you have to get your car tuned after switching out the injectors or will your ECU be able to adjust enough to keep things running?

[Alex(AUS)]

It does (to a point).

The URD 300cc injectors do work on the stock ecu. It takes the ecu approx 5 mins to learn how to idle and run. However, the ecu does have limits as to how far it will trim (+ or -). So, dont go trying something stupid (more than 300cc). This is not to say that this is optimum. Not to mention that the car runs like crap every time the ecu is reset (for 5 mins).

Alex

[Turbosolara]

you suppose reset the ecu, and it take exactly 10 minutes to learn the new voltages (unless 4cyl is different from v6? but i heare all toyota works this way).

also very important, remeber to replace all injector o-rings, you cannot reuse them once you take it out.

[Astro]

Man, install seems like a b*tch. Would it be better to have the injectors installed by a shop? I really don't feel comfortable taking off the s/c. Mainly because this is my daily driver (working 6 days a week) and I don't want to f things up. I'll probably have Toyota do the plugs, since I'll be needing major service soon.

[Alex(AUS)]

Man, install seems like a b*tch. Would it be better to have the injectors installed by a shop? I really don't feel comfortable taking off the s/c. Mainly because this is my daily driver (working 6 days a week) and I don't want to f things up. I'll probably have Toyota do the plugs, since I'll be needing major service soon.

If they do the plugs they will probably take the supercharger off anyway. Then the injectors are easy (they shouldnt charge much but they probably will).

Alex