Ram jet

[Fotoboy]

THis may be pretty obious but make sure that you run a good reg. Its also a way to kinda cheat and mess with af.

[camcojb]

Originally Posted by Fotoboy

THis may be pretty obious but make sure that you run a good reg. Its also a way to kinda cheat and mess with af.

Huh??!!

Jody

[Fotoboy]

Originally Posted by camcojb

Huh??!!

Jody

Fuel pressure regulator, I spent may hrs on the phone w Arizona Speed and Maine, these are the guys that designed the system for GM, they said that you could change the AF globally w increasing fuel pressure but was not the best way to do it, being a speed density system nothing would correct the sytem. The timing on the other had at wot never changes when you spin the dist., only the idle timing is changed. I have got conflicting answers with calling them mult times, but I keep in the back of my mind if i am talking to a sales man or a tech guy and take it with a grain of salt.

I want to the dragstrip andit was like 30 deg and the car was running way lean to the point that it was bucking down the strip so I increased the pressure 10 psi and it went away and ran consistant 10's after that. THis year we are puting a procharger on it so I will be switching to a xfi system or something like it.

[pushrod243]

A lot of thought should go into your fuel system or you might spend money twice to get a system that works correctly in the end. If you search this forum there is a lot of info about injected fuel systems. One of the things you have to keep in mind is keeping the fuel cool. The pump heats up the fuel then you are pumping it to the fuel rails and returning the excess which is heated by the engine. Eventually you can boil the fuel in the lines if you have a bad system.

One solution is to run an in tank pump to help cool the pump. I like the bosch pump from a Porsche Turbo car. I got the part # from this forum. Kurt from wheel to wheel suggested it when I was having trouble with my aeromotive pump. I had Ricks build a tank with two of those pumps inside it. I had planned to put twin turbos on my car and need the second pump for the trubos. Your ramjet should be fine with one pump since that is all i use on mine without the boost.

Also fuel line and returns must be large enough to move the fuel without causing any restriction. I would suggest -8 feed and -6 return as minimums some guys might tell you -10 feed with -8 but I have -8 on my car and it seems to work fine.

You should be able to put a system together without buying a high dollar tank but you will need the right pump etc to get it done. My car is a 69 Nova with a ramjet 502. And it was boiling fuel in the return lines on the power tour in 2005 and the bosch pumps in the gas tank cured that. I did it twice so you dont have too

[Fotoboy]

Originally Posted by pushrod243

A lot of thought should go into your fuel system or you might spend money twice to get a system that works correctly in the end. If you search this forum there is a lot of info about injected fuel systems. One of the things you have to keep in mind is keeping the fuel cool. The pump heats up the fuel then you are pumping it to the fuel rails and returning the excess which is heated by the engine. Eventually you can boil the fuel in the lines if you have a bad system.

One solution is to run an in tank pump to help cool the pump. I like the bosch pump from a Porsche Turbo car. I got the part # from this forum. Kurt from wheel to wheel suggested it when I was having trouble with my aeromotive pump. I had Ricks build a tank with two of those pumps inside it. I had planned to put twin turbos on my car and need the second pump for the trubos. Your ramjet should be fine with one pump since that is all i use on mine without the boost.


Also fuel line and returns must be large enough to move the fuel without causing any restriction. I would suggest -8 feed and -6 return as minimums some guys might tell you -10 feed with -8 but I have -8 on my car and it seems to work fine.

You should be able to put a system together without buying a high dollar tank but you will need the right pump etc to get it done. My car is a 69 Nova with a ramjet 502. And it was boiling fuel in the return lines on the power tour in 2005 and the bosch pumps in the gas tank cured that. I did it twice so you dont have too

Never had problems w the current pump boiling fuel but I have to switch to a bigger pump, so I hope I dont have too much problems w this. What pump were your running when you had the boiling problem?

[pushrod243]

Originally Posted by Fotoboy

Never had problems w the current pump boiling fuel but I have to switch to a bigger pump, so I hope I dont have too much problems w this. What pump were your running when you had the boiling problem?

I was running an aeromotive a-1000 pump outside the tank. It was on the powertour and after a few hours of continous running it would act like it was vapor locking.

[camcojb]

Originally Posted by Fotoboy

Fuel pressure regulator, I spent may hrs on the phone w Arizona Speed and Maine, these are the guys that designed the system for GM, they said that you could change the AF globally w increasing fuel pressure but was not the best way to do it, being a speed density system nothing would correct the sytem. The timing on the other had at wot never changes when you spin the dist., only the idle timing is changed. I have got conflicting answers with calling them mult times, but I keep in the back of my mind if i am talking to a sales man or a tech guy and take it with a grain of salt.

I want to the dragstrip andit was like 30 deg and the car was running way lean to the point that it was bucking down the strip so I increased the pressure 10 psi and it went away and ran consistant 10's after that. THis year we are puting a procharger on it so I will be switching to a xfi system or something like it.

I understand the fuel pressure regulator it was the cheating part I didn't get! Obviously up the pressure will affect the A/F, but never considered it cheating.

And the above is why I never use an EFI system that I don't tune myself. The tune and quality thereof is the key to a good EFI system, so these "closed" systems that can't be tweaked by the end-user do not appeal to me.

[Fotoboy]

Originally Posted by camcojb

I understand the fuel pressure regulator it was the cheating part I didn't get! Obviously up the pressure will affect the A/F, but never considered it cheating.

And the above is why I never use an EFI system that I don't tune myself. The tune and quality thereof is the key to a good EFI system, so these "closed" systems that can't be tweaked by the end-user do not appeal to me.

I agree, thats why Im switching it this year, cant deal w the non tunability, but I only drove the car for 3 mo so I got used to it......then I dropped a valve seat, and now its getting modded.