automatic fuel pressure controller

[DragGSX]

what do you guess think about this product i came across

http://www.streetrays.com/catalog/product_info.php/cPath/53_584/products_id/9409

 

[DragGSX]

that was my reaction too...uhhh...How does it do this.. how does it keep your a/f ration at 12.1...says its electroniclly controlled so maybe its tied into the 02 sensor?

 

[2-0turbo]

Looks like a rising rate regulator to me. You see these from Paxton and others to adapt typically NA cars to forced induction. Instead of linearly increase FP for each lb of manifold pressure, they are often at some other multiple to provide enough fuel during boost conditions.

 

[Tallen]

It is not electrical, it is for cars with EFI. I'd personally stick to what works...Full Throttle, etc.

 

[pianoman]

I know in Maxium Boost, Mr. Bell talked about using a rising rate regulator for fuel control. I remeber he said something to the effect of, they work fine at WOT but it was during part throttle and idle that I don't think they were that great. I'll have to find it and re-read what he said.

 

[Bostedquest]

That is nothing more then a Rising Rate pressure regulator.

the 12:1 means that for every 1 PSi it sees from the manifold, it raises the fuel pressure 12 PSi.

 

[DragGSX]

That is nothing more then a Rising Rate pressure regulator.

the 12:1 means that for every 1 PSi it sees from the manifold, it raises the fuel pressure 12 PSi.

are you sure about that...what if your running high psi...lets say 20 psi..that times 12 is 240psi. Does this mean at WOT that ur FPR is closed

 

[kahl23]

240 sounds kinda high, but it definitely is a fixed rate regulator. The Aeromotive one that people like so much here happens to be a 1:1 ratio, this one is just higher at 12:1. At least thats how I read it.

 

[4SFED4]

That is nothing more then a Rising Rate pressure regulator.

the 12:1 means that for every 1 PSi it sees from the manifold, it raises the fuel pressure 12 PSi.

Exactly

If you plan on using one I hope you like buying and replacing fuel pumps. They have other ratio springs available as low as 3:1. I see the point for trying to retain economy, but as far as a factory turbo DSM application I feel larger injectors would cause less headache.

 

[sweet97]

It is not electrical, it is for cars with EFI. I'd personally stick to what works...Full Throttle, etc.

I agree. Our AFPR's like the one I have from Full throttle is a 1:1 ratio. 1 psi of fuel for 1 additional psi of boost. that is not claiming to keep an a/f ratio of 12:1 is it?

 

[red93tsi]

I think you're pretty far off with the raising fuel pressure at a 12:1 ratio. At atmospheric pressure a 2g is set at 43 psi. With a 12 to 1 ratio you're talking 283 psi in the fuel system @ 20psi. That's starting to near what top fuel cars run with nitro methane, and they dump about 10 gallons of gas just to do one pas at the drag strip. 4 gallons ruffly from the tree to the line, add on burn out, staging, etc, and you use alot more fuel. The pumps 99% of dsmers, or any car enthusiasts use is not capable of that pressure. You also have to take into consideration that your flow rate does not increase nearly as dramatic as your psi rate, meaning, you would not be able to support enough fuel to the injectors using this formula. Theoretically if your pump, and fuel system could support this pressure, you'd only be seeing a fraction of the volume of fuel to the pressure increased. This would also imply that your injector pulse width would have to be constant to maintain a proper 12:1 a/f ratio even if you could raise the volume at the same increase as pressure.

I'm not saying I know how this claim works, but the logic stated in ealier posts doesn't add up. No offense to anyone

 

[4SFED4]

I think you're pretty far off with the raising fuel pressure at a 12:1 ratio. At atmospheric pressure a 2g is set at 43 psi. With a 12 to 1 ratio you're talking 283 psi in the fuel system @ 20psi. That's starting to near what top fuel cars run with nitro methane, and they dump about 10 gallons of gas just to do one pas at the drag strip. 4 gallons ruffly from the tree to the line, add on burn out, staging, etc, and you use alot more fuel. The pumps 99% of dsmers, or any car enthusiasts use is not capable of that pressure. You also have to take into consideration that your flow rate does not increase nearly as dramatic as your psi rate, meaning, you would not be able to support enough fuel to the injectors using this formula. Theoretically if your pump, and fuel system could support this pressure, you'd only be seeing a fraction of the volume of fuel to the pressure increased. This would also imply that your injector pulse width would have to be constant to maintain a proper 12:1 a/f ratio even if you could raise the volume at the same increase as pressure.

I'm not saying I know how this claim works, but the logic stated in ealier posts doesn't add up. No offense to anyone

The 12:1 ratio regulator is not designed for use in high boost applications, its for 8psi or lower kits for N/A EFI cars. Hence the availabilty of different spring pressures for higher boost kits. Go to Vortech's site and read the product description.

 

[DragGSX]

So if it indeed does raise FP 12psi for every 1psi in the manifold. Isnt there a max psi injectors are work at, meaning too much psi they dont work right...they talked about this on the 3SI forums