315CC Injectors ok for s/c?

[Vampire]

The stock fuel pump could not keep up well from when you approached WOT. I saw significant changes in fuel cell values when the Walbro went on.

After factoring in Jim's kit, I guess what is being said is that the problem has more to do with the fuel pump than the injectors. Right?

[Ian]

Cool. I'm going to install the Walbro fuel pump from URD in about a week and see what happens. It may not result in an optimal setup as it could if I used a SAFC to tune, but it seems it will be better than using the stock fuel pump. I doubt there will be any risk of running rich since the stock injectors will still be operating with the stock fuel trims.

That will be sweet if I can get more performance with the fuel pump without having to change the injectors. I'll let everyone know how that worked out.

[jim@foreignaffairs]

After fixing the fuel filter and lines after, a higher output fuel pump is all you really need. My fuel system I completely converted for test purposes, however it is such overkill that while it is nice to have, it's like running a couple of 10,000 watt amps on your sound system. It uses a fuel pump that can deliver about 4 times what the stock one can, as well as a Aeromotive fuel pressure regulator and a very exotic fuel filter.

Jim

[StockSolara]

Hello all. I haven't been on for some time since I have been super busy but finally got on and thought I would reply to the bigger injector question. First of all let be say that I have an '01 Solara SLE w/ 3.1 Liter (bored out a bit) 9.2/1 compression, 7-8 psi boost, high flow heads, Total Seal rings, etc. etc.. My car last dynoed 274.9 HP at the wheels through the automatic transmission. I do use a S-AFC for fine tuning. I use STOCK injectors! I have modified my fuel system to deliver a rock steady 50 psi with various things, the most important of which was something most of you have already bought from Foreign Affairs, a special fuel kit that fixes the problem with the stock fuel filter and fuel lines after the filter. Aftermarket injectors are completely unnecessary. I have tried Supra injectors and they always ran too rich especially at idle. There is no reason to spend money on aftermarket injectors unless you plan on and build your motor for much higher output. By the way, I have a almost new set of N/A late model Supra injectors for sale cheep!

Jim

So what would you suggest with people wanting to tune with the Supra MAF? Wouldn't with the upraded MAF. . . You will need upgraded injectors?

[Ian]

Since we are on the fuel pump topic, I've read some old posts on this site, and others, that the Walbro fuel pump for the Solara has a whining sound.

Since we are in 2006, I am wondering has anyone figured out how to get rid of that whining sound, or mask it?

My fuel pump is on the way, and that noise is the only thing I dred.

Thanks,

[jim@foreignaffairs]

The design of the Walbro pump is different internally that the stock pump which was designed to be very quiet, to give the same basic size unit the ability to supply more fuel, or so I have read. But the downside of the design is lots more noise. I tried one and it was quite obnoxious. I use a Bosch pump mounted outside the tank now and it is much bigger but actually much more quiet, though still a little bit noisy. I'm not sure how to make it better though I rarely notice the buzz. This is not an answer to your question, but the only thing I can imagine would help is some sort of insulation. I put some fiberglass insulation under the rear seat that helped a bit, but I think that sound insulation used by stereo installers might work better unless someone found a way to wrap the pump in fuel proof sound insulation. But with all the chemicals in fuel, I can't imagine what would work inside the tank.

Jim

[jim@foreignaffairs]

Why bother with the Supra MAF? I may be wrong, (wouldn't be the first time!) but I believe I read that the Supra MAF meter was no less restrictive than the Solara MAF. But if you are really wanting or nneding to upgrade I would look into a MAF from a much larger displacement application. I would try a MAF from a big Toy Pickup. With a unit like the Split Second and a good scanner, you should be able to tune any electronically compatable unit (within reason). But I am using the stock unit and it is good to at least 275 wheel HP (about 330 crank HP). So unless you have made a lot of other more important prerequisite modifications first, you can do a lot of tuning with the stock MAF meter.

[Ian]

I think I will cover the framing under the back seat with Dynamat. My Supra buddy said that it works well, and should mute the sound from the fuel pump.

I was noticing on their website that they have different applications for sound muting products. I don't know how much insulation the floor has, but they have dynamat for the car floor to reduce road noise. I might consider doing the floor for even more quietness.

[Ian]

I think I will cover the framing under the back seat with Dynamat. My Supra buddy said that it works well, and should mute the sound from the fuel pump.

I was noticing on their website that they have different applications for sound muting products. I don't know how much insulation the floor has, but they have dynamat for the car floor to reduce road noise. I might consider doing the floor for even more quietness.

I posted the results of my new fuel pump on a different thread, but I thought I would close this one out since it was so on point.

With the new URD Walbro 190 fuel pump, performance is better and acceleration smoother. I imagine that my engine is happier to have more fuel. Most surprisingly is that I have ZERO noise from the URD Walbro 190 fuel pump. I was expecting a hellish whine, but I've been running it for a week or so and I don't hear jack.

I spoke with Gadget about the difference in the Walbro vs. the stock. The stock fuel pump uses a plastic propellar to flow the fuel; that is why it is quiet. The Walbro uses metal meshing gears (sort of like the S/C) to flow more fuel; that is why the Walbro pumps whine.

Why mines doesn't make a sound, I have no clue. But, I'm not complaining.

Case closed.

[PDX SuperSolara]

Other people have told me that the 190 Walbro pump is not too noisy but the higher output ones are. All the more reason not to go bigger than necessary.