I know this has been beat to death...but there is so many diffrent views on this. I decided to go with a blower setup on my 10.8:1CR 404. I'm going to shoot for around 700ish to the wheels. I dont want to "cheap" on the fuel system, but I dont want to spend a crazy amount of money for parts I dont "need". I already have a racetronix single pump with hotwire kit. Can I jsut add a regular walbro in there, or will I need to get a racetronix pump? I think they are basically the same...Aslo can I use the stock feed, and use the evap for a return with this HP level? I have seen post where SpeedInc has pushed the stock feed line to upwards of 1000HP. But then I have heard that the limit is 600hp. I will be getting fuel rails for sure, and a regulator. But what regulator do I need? Also will 60lb injectors be enough?

Or should I just man up and wait til I have the funds and run all new -8 feedline, sump the tank and run dual BOSH420's with 80lb injectors?

I will have meth injection either way I go. I know I'm going to get a lot of mixed reviews, but would still like all the feedback I can get...thanks

 

I am using Lonnies twin racetronix in tank pumps with the stock feed, regulator, and fuel rails with 60# injectors pushing almost 700 to the wheel. Without meth it looks like I am getting close to running out of injector not fuel as my fuel pressure didn't get below 57psi when it was getting tuned.

It would start at about 58 psi, then when the second pump kicked on it spiked for a moment to almost 70psi then the regulator brought it back down appropriately.

 

We made 820 to the wheels on 97 C5 with the stock GM feed and return lines and Lonnies Double Pumper. We did use after market rails and a boost refrenced regulator.

 

Ok well I believe I'll be closer to 800 than 700 actually, so I liked to hear that. I can jsut add another pump to mine thats already in there, "T" them together, and run some nice thick wire, relays and a hobb's switch and hopefully good to go? Whats a good regulator to get?

 

Do not T them togather but Y them togather less restrictive lol. Also You caanot run two pumps on a hot wire kit...Ask me why I know.... But in any case you can fab up your own hot wire kit for the second pump or buy another one. Also have a seprate power source to prevent a dramatic power drop.

 

Yeah I didn't mean run both pumps off one wire lol. What other power source can I use? I've got my hotwire kit ran to the alternator, would I run the other one straight from the battery?

 

I used some Monster cable (used on car audio amps) hooking to 12V from the battery to the pump(s). A hobbs switch and a relay turn the second pump on and off. Works good enough for me.
I've pushed dual intank pumps and stock feed, rails and regulator to 700hp no problem but that was only dyno time. The entire fuel system was upgraded right after.

 

Does anyone have a link on how to get a -8 fitting coming out of the stock pump assembly?

 

http://www.summitracing.com/parts/AEI-15118/

i used this on mine. i run 2 255's all the time. i used the factory feed as a return with no issues.

 

Would I still not be restricted by the quick connect off the fuel pump?

 

i have two walbros y'd together in my tank....feeding professional products fuel rails using the stock feed line. I got the 97-98 vette Professional Products rail kit as it came with a regulator. Im around 950rwhp dynojet.

 

i got two walbros Y'd in the tank feeding pro products rails with stock feed line, made 750 with boost referenced regulator and 60 lb injectors

 

No, the volume of the -8 line allows the extra flow. Example, you can easily blow through a 3" piece of 3/8" hose. Now try blowing through 10' of 3/8" hose, very hard to do. Increase the last 9' of the hose to 1/2 inch and flow will increase dramatically.

 

What regulator are you using Jerry? And do you have it to where when you get into boost it ups the fuel pressure?

 

the pro products regulator that comes with the 97-98 vette rail kit,,,and it is boost referenced

 

man i wish i had the same good luck as you guys with the twin intanks, i have a 2000 Z28 and did the twin intanks, but the problom i have is that if i get below 1/2 tank of gas it emptys the bucket and goes lean as ****, so what, im going to do is pull the 2nd pump, and put a in line 255 on the car, and run it fron the bottom of the tank. I have seen this setup support about 1000 to the tire and im well shot of that. So good luck with it i know a lot of guys have great luck with the twins but i did not

 

From what I have read is that you dont want to vut the bottom of the bucket completely off. If you leave part of it down there it puddles the gas up right below the pickup, so theoritcally you shouldnt have the problem your having.

 

do you have a pic of your setup? I dont think I have seen a setup quite like yours...

 

When done correctly you should not have that problem. We have done several hundred dual pump setups and have had Zero issues you can run it low without problem it has been 100% reliable. Ours has made 1098rwhp without showing signs of limit. Please do not cut your tank you will have more problems with a bulkhead cracking or leaking than you do now.

 

When done right the dual intank pumps will support 700rwhp without any other mods. Any more I would add a -8 feed -6 return line and front mounted regulator. We have a few kits to accomplish this complete and ready to go.