I am thinking of buying a z from a club member in my area who has lost interest in his car. the motor is stroked and blown with a t-trim lots of high quality parts that i dont want to bother listing. there are a few minor issues that i would need to deal with. the one main concern i have is the car will shut down after about 20 mins of driving in traffic. it seems as though the fuel rails just gets to hot from the massive fuel system and shuts down the motor. here is some details on the fule system
Fuel System: Weldon 2015 with Dial-a-Flow and Weldon AFPR, dual filters and all lines replaced oversize with stainless braid. No in-tank pump.


it currently has a stock hood and i was thinking a cowl hood would allow much of the heat to escape. or even possibly some custom fender vents. of course also having the manual fan switch would help.

i know many people on this board have motors making huge power and just wondering if this is a common problem and / or reccommendations on how to solve it. I dont own the car yet, and i know it is going to be a project i am just trying to get some feedback about solving some of the issues.

thanks
miles

 

I have never heard of that problem. You may want to try to remove the weather stripping along the cowl at the base of the windshield. It will allow ALOT of heat to escape from the engine compartment, even when sitting. But it will make the car slightly louder because its good at killing sound.

 

yea, i have heard that with poorly designed fuel systems. Where are each component mounted, can you draw a schematic of your fuel system along with sizes..

 

I know the car you're talking about; memory has it the fuel lines are routed directly above the driver's side header (non-coated) without any shielding...that's the first thing I'd change.

 

Wow...deja vu! Obe1 and I were just talking about that car last night! I'm sorry, but you cannot buy it...the last thing we need around San Diego is another BEAST running around! Just kidding, that's a bitchin' car and once those little issues get sorted out, it's gonna be an awesome ride. I agree with Obe1, try rerouting the lines and maybe call Weldon to get their advice. Might want to swap out those headers for some coated ones too. It's gotta be something simple that's being overlooked...

 

Jordan
as the guys below said the lines are run ontop of the fuel rails above the uncoated long tubes, so this cant help



Brian

I talked you a few months ago about the car. I know i havent bought it yet, but i was up in the area and saw the car last week and that got my interest going again. I just need to convince myself to start (finish) a project.

 

yes, that cant help, but is certainly not THE problem.

like i said, if you can give me a schematic of how its hooked up and line sizes..

 

How about a cooler for the return back to the tank? Sounds like the fuel pump may be pretty large, and running alot of fuel over the regulator. This creates heat, a cooler would remove some of this. I think Permacool makes a fuel line cooler.

 

Jordan

i am working on getting a layout from the owner so i can get some more input

 

Does the car have a fuel pressure gauge in the car? IF so does pressure drop when it dies?That dial a flow will keep that pump from working to hard under normal driving conditions, so cross that out. Also you may need to check the tune on the car. Im sure the computer has been flashed before. It maybe that after the engine temp hits a certain degree too much fuel is being pulled causing a lean condition.
Just a few thoughts considering these LT1 intake boil from the factory.

Also check to make sure the tank has propar ventilation, could be vapar lock

 

Jordan here is some more info i got from the owner on the fuel system

-12 line form the tank forward with a -8 return line, stock plumbing removed from the tank and replaced with a big pickup line, through the top where the original plumbing was. Weldon 2010 Fuel pump (I think that's the number but it is 1000 gallons per hour), large particle filter before the pump and small particle filter after the pump. I don't remember off-hand the filter particle sizes. The feed line is T'd before the fuel rails so that each rail has a direct supply rather than the stock system that runs the fuel through one rail and then the other before returning it to the tank. Weldon adjustable fuel pressure regulator. There is no FMU, the stock computer has been re-programmed by Mike Morgan. Injectors are flow matched 50 lb/hr with the stock impedance. There is a Weldon "Dial-a-Flow" unit installed so the driver can regulate the fuel flow to not have the full pump capacity when not using the gas pedal. This Dial-a-Flow system is designed to limit the flow while maintaining the pressure.