670 turbo question... First Choice Turbo kit..

[WeTDrEaM24]

Picked up a Aerodyne Series 53 Turbo kit a few days ago. The kit came with 2 different books. One is from Aerocharger the other is from First Choice Turbo Center.

This is the problem I am having... On the connection for the fuel pump in the aerocharger book there is a rectifier that bolts to the foot well on the right side. 2 wires from it go straight to the fuel pump and the other 2 go to a power outlet plug under the console. So this would give constant power to the fuel pump with the sled running.

The First Choice booklet has the same rectifier but it has the wires going into a hobbs switch on the top of the air box before the fuel pump??

The kit i have did not come with a hobbs switch so is it not necessary for this kit??

I also have a HI/LOW switch that is listed in the First Choice book but not in the Aerocharger book??

 

[Bad Oscar Customs]

turbo parts!

What you have is two different ways to run the fuel system. With the first choice book/kit they ran the power to the hobbs from the rectifier to turn on the electric fuel pump at a certian boost presure and had a battery to run the fuel pump. At idle and low speed the stock impulse pump was used then when the boost presure came up it turned on the electric fuel pump by the hobb switch so that the fuel supply that was needed when on boost was there.

The areo charger book/kit ran the system with out a battery and ran the electric fuel pump off of the motor's own power and it ran constant and did not turn on and off with boost presure with a hobb switch. I think that they still did run the stock impulse pump also. With this kit you will need a capasitor to keep power to the electric fuel pump at all time's.

If your kit does not have a hobb switch then you do not need it but you should have a capasitor to run the power through, check for that?

The high low switch will work with what you have and it was an option back then with the first choice kit. I do not think that aerocharger dallas offered one as an option on there kit. This hi/low switch will up your boost by about 2 psi of presure, all it does is fool the controller on the turbo to make it boost 2 more pounds to get to the boost setting that it is set, when all it is doing is bleeding off the line that goes to the controller so it will make more boost presure.

hope this helps!

 

[WeTDrEaM24]

670 Turbo

Ok, so the kit i have is definitely the Aero Kit since I have no hobbs switch. I just have the rectifier that goes from a hot plug to the rectifier then to the fuel pump...

Now what about the way the fuel lines hook up... The have you putting a T fitting in line where the fuel comes from the tank. This goes into the fuel pump then to the regulator. Off the regulator I have a single line that comes out that also splits into 2 hoses. Now do the stock lines that come from the impulse pump still get hooked up to the carbs and the other 2 that come off the regulator T'd in to those?? If they only wanted you to run the impulse pump why would it have a T fitting to tap into the hose coming off the tank? Then on the other hand if the pressurized fuel is T'd into the impulse pump lines wont it just feed back into the regulator??

 

[motoman620]

The line from the regulator T's into the PTO side carb fuel line from the stock pump (closest to the pump is best) this will feed both carbs through the "common" cavity in the stock pump. That way if the electric pump fails it will allow you to limp back on the factory pump. Also you need to make sure you run a capasitor along with the rectifier, tap into the side feeding the pump from the rectifier with the capasitor this will help the pump get a more linear voltage. I know Turbo Doc sells the correct capasitor for this application. Hope this helps.

 

[WeTDrEaM24]

670 turbo

I will have to check with Turbo Doc on the capacitor?? Not sure why it doesn't show anything for that in either book?? I understand why you would need it though...

Now about the feed hose from the regulator... Why is it that it is T'd into the PTO carb close to the factory fuel pump and not into each hose at each carb?? I assume the psi from the pump is enough to feed both carbs even after going through the factory pump then to the MAG carb??