Turbo Seca fuel pressure question

I've seen 14 psi quoted for the factory pump's output pressure, does this mean that the delivery pressure on the carb side of the fuel pressure regulator should also be 14 psi?? TIA.

 

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Bumped
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I don't know the Pressures.
The "Flow" out of the Pressure Regulator is stated in Volume.
With the Pump running and the Petcock set to Reserve to conduct the test:
The Fuel delivered from the Pressure Regulator is a set Volume.
With the Current to the Pump ON for exactly 15-Seconds, ...
300cc's of Fuel should be collected in the Test Container.
(A Ratio-Rite Cup is the recommended vessel. The Container is marked with precision gradients.)


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When the bike is idling or running at atmospheric pressure (no boost) there should only be 4-6 psi on the carb side. When the boost builds, it will gradually open the regulator to allow near 25-30 psi at full boost (12-14 boost pressure) I've heard of people putting aftermarket pumps in from cars that have a 40 psi rating and it works with no problems for them. On 1 of my turbo's I use a pump from a Kawasaki gpz750 turbo which was a fuel injected bike and it works fine, runs about 30 psi at full boost.

 

You need somebody who has got a TurboSeca Factory Book.

 

As Rick noted, measured in volume (60L <13.2imp gal, 15.9US gal>) quoted exactly from the turbo manual) and not pressure. The manual does not state whether this is measured in LPM (liters per minute) liters per hour or liters per year! You were correct in stating that from another section of the manual, the stock pump pressure is rated at 14.2psi and the check valve and regulator work to allow 3.5 liters to flow to the carbs which is fine if you want the stock boost of 11-12psi. Excess fuel will be returned to the tank via the return line.

BUT, if for S&G's you wanted to run at 18 pounds of boost, you would want to upgrade that pump a bit. My pump if from a 2004(?) R6 Yamaha and it's output is rated from what I found to be 43psi at peak output.

What is important is that your pump is always capable of providing enough fuel, at enough pressure to EXCEED whatever your boost pressure is. If you are producing 20 lbs of boost but your pump only gives you 16.....see what's going to happen? The stock regulator can easily handle 45psi so "go high" and never worry about leaning your engine at high boost and high rpm.
I have never measured my pump output or pressure but have of course done plug chops from full boost.....or as much as I dared(shutting off a engine after running extended time at full boost would be asking for total destruction of the turbo since the cooling and lubricating oil would be shut off to it) and I have my carbs set the smallest amount rich.

I also think the tip I received of installing the N/C 12 volt solenoid was a really big help. Never a care if my petcock is leaking fuel and filling my crank, it just isn't possible with the valve in place.

hope this helps.
jeff

 

What is important is that your pump is always capable of providing enough fuel, at enough pressure to EXCEED whatever your boost pressure is.

 

P.S. How in the f do you properly use the quote function?????

 

Like this.

nah, seriously though:

(quote="oilheadron")How in the f do you properly use the quote function?!(/quote)

Except you use the square brackets instead.

You can also hit the "quote" button at the top right of someone's post.

 

I hit the quote button. Let's see what happens.

 

Got it.