Since it takes forever for someone to look at in Performance!

[MexRocket]

Blah blah I posted about the rewire and the FPR, on dsmtalk a guy said the rewire wont be needed. Here is what he had to say, I would like your thoughts

First off, rewiring your fuel pump causes the pump to flow MORE. You are overrunning your factory FPR currently, why would flowing MORE help? If you get a adjustable FPR then you can rewire the fuel pump, but you dont need to rewire it with the 255lph on your current setup. Even in factory wiring form the 255lph will handle well over 50lb/min of airflow. The 14b at most flows around 29-30lb/min of airflow.

Get the Megan FPR if you want, but personally I would get something that is definately proven when it comes to fueling. Megan Racing is likely good for exhausts, but without something allowing me to monitor the operation of the FPR while boosting I wouldnt want to use anything but an Aeromotive or an SX regulator


The 255lph is more fuel pump than the Evo 3 16g will ever require even in unrewired form. On that note 560's arent enough for an Evo 3 16g turbo at full potential, and the 255lph's fueling capabilities even in unrewired form dwarfs 560's maximum flow abilities. To put this into perspective, on factory fuel maps 560's will allow 29lb/min of airflow at 85% duty and 9.5:1 AF assuming pump gas. The 255lph on pump gas with 30psi additional boost pressure, will have the flow capabilities of 50lb/min at a 9.5:1 AF. The Evo 3 16g flows at best 38-40lb/min. Do you see how overpowering the 255lph is in a setup such as that. Get an AFPR and up your fuel pressure to 43.5psi to correctly match that or what most injectors are rated at, not to mention you'll be able to push your factory injectors further by doing that. Absolutely no rewire is needed.

While he has been talking I posted about buying 560's and evoIII 16G and if I really need to get AFPR or if I could jsut use the megan one, it;s cheaper I trust them, has the gauge and everything.

[blk_srt]

Do it and let us know how it works

[MexRocket]

Well I am going to buy the FPR, just wondering if everything else that guy said is accurate. I wish Kevin would come to the rescue =]

[crunchymilk55]

actually if you are running an evoIII, the walbro 190 is more than that turbo will ever use. I run the 190, that way you don't need to worry about an FPR at all.

[ez1286]

Originally Posted by crunchymilk55

actually if you are running an evoIII, the walbro 190 is more than that turbo will ever use. I run the 190, that way you don't need to worry about an FPR at all.

I think he's already got the 255 in it.

[defiancy]

I think the re-wire while is for more fuel pressure. Is mostly for constant fuel pressure due to the higher guage wire. It just makes the fuel run at it's max efficiency and constantly like that.

As far as the AFPR, while with a re-wired 190 you may be overrunning your stock AFPR it's not enough to affect performance. Maybe a slightly rougher idle. But we talked about this in another thread a few things down.

[MexRocket]

So then the rewire isn't a must if I already have a 255 then? It is still a good idea to get the FPR right? because the stock one can't handle that much from the 255?

[crunchymilk55]

with the 255 you don't need the rewire. You DO need a FPR though.

[MexRocket]

Ok thanks guys. But of course, there is a new problem.

[kjewer1]

Here is my take on this, and I didn't see the tooners guy mention this. Who in thier right mind would want to pull 20+ amps through the stock 18 guage wire? Sounds like a fire hazard, but thats just me. To reason further, if you need the AFPR anyway, what possible drawback does rewiring have?

A 190 is far too risky on an EVO3 16g and up if you ask me. The EVO8 turbo is very similar, and the EVO8 stock pump flows the same as a 190 IIRC. I maxed the pump out by FAR on the stock wiring. With the rewire it is barely adequate. It works, but I only had ONE lb/min of headroom. Why take that risk? I went to a 255 to be safe. The last motor I lost was on a rewired 255, due to out flowing the pump. Don't want that to happen again any time soon

Also, 550s or similar are too small for an EVO3 16g turbo. I know I've posted numbers elsewhere, and local DSMers have maxed them out on that turbo. Again, it's risky. With the fuel system its better to go too big, as long as you can still control it (I wouldn't go over 650s on an AFC, for example).

[scottsee]

I agree with everything that guy off Dsmtalk said.

[MexRocket]

Yah I agree with the 290 part I do have the 255 already installed... It came with the car. I am going to order the Megan Racing FPR. I didn't know 560's were to small for the evo 3