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pro systems carb

Post  chuck on January 25th 2015, 10:01 pm

The car I bought has a pro systems dominater carb. I'm not a fan of the carb, but it's what I got for now. It has power valve in it, 88 main 96 secondary. I've always run q fuel and they don't come with power valves. Would I be better to take them out and square the Jets.

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Re: pro systems carb

Post  whatbumper on January 25th 2015, 10:43 pm

There are benefits to both ways. Configure it to how you are comfortable.

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Re: pro systems carb

Post  DaveMcLain on January 26th 2015, 8:50 am

chuck wrote:The car I bought has a pro systems dominater carb. I'm not a fan of the carb, but it's what I got for now. It has power valve in it, 88 main 96 secondary. I've always run q fuel and they don't come with power valves. Would I be better to take them out and square the Jets.

What's wrong with the carburetor?


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Re: pro systems carb

Post  D. Sea on January 26th 2015, 11:52 am

My Pro does not have power valves.
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Re: pro systems carb

Post  whitefield on January 26th 2015, 12:28 pm

power valve or no power valve depends on aplication an intended use .
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Re: pro systems carb

Post  chuck on January 26th 2015, 12:43 pm

Nitrous race application, nothing wrong. I always thought power valve were for the street.

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Re: pro systems carb

Post  nickbay on January 26th 2015, 5:30 pm

Patrick has a web site where you can ask anything about his carbs, even if you did not buy it directly.
You just need the carb number on the side.

http://prosystems.websitetoolbox.com/
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Re: pro systems carb

Post  Lem Evans on January 26th 2015, 9:20 pm

chuck wrote:Nitrous race application, nothing wrong. I always thought power valve were for the street.

With the spray.....lose the p.v.

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Re: pro systems carb

Post  hienergy557 on January 27th 2015, 9:11 pm

PV's are for fuel economy. Get rid of it.
No use on a race engine.
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Re: pro systems carb

Post  DaveMcLain on January 28th 2015, 9:09 am

hienergy557 wrote:PV's are for fuel economy. Get rid of it.
No use on a race engine.

This depends on what type of racing you're doing....


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Re: pro systems carb

Post  kim on January 28th 2015, 12:06 pm

Sure does. Some of the most fuel efficient carbs ever bolted to an engine were on NASCAR in the last years of carb engine requirements. Where pitting costs track time, a gallon of saved gas can make a huge difference in the outcome of a race.

Not everything tries to go in a straight line for 7 seconds.....

Even in N2O systems, power valve isn't always bad. The worst is where a plate is right below the carb and can really shock the air flow on the intial hit.

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Re: pro systems carb

Post  Lem Evans on January 28th 2015, 1:44 pm

Dominators are no longer legal in NASCAR and they have long since caught the guys that were running spray.

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Re: pro systems carb

Post  kim on January 28th 2015, 2:17 pm

Lem Evans wrote:Dominators are no longer legal in NASCAR and they have long since caught the guys that were running spray.

Did NASCAR ever allow the 4500 series carberator? The fuel injection throttle body is 4500 series based... But in my short knowledge of the sport the carb of mandate had been the 4150

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Re: pro systems carb

Post  Lem Evans on January 28th 2015, 3:16 pm

FoMoCo paid for the development of the Dominator carb. It was 1st used on the Boss 429 NASCAR engines.

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Re: pro systems carb

Post  bbf-falcon on January 28th 2015, 5:44 pm

hienergy557 wrote:PV's are for fuel economy. Get rid of it.
No use on a race engine.

Not true,Carb technology has changed. Like was said,visit ProSystems website. My 1390cfm SV-1 has pv's.

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Re: pro systems carb

Post  yellowhorse7 on January 28th 2015, 7:14 pm

kim wrote:
Lem Evans wrote:Dominators are no longer legal in NASCAR and they have long since caught the guys that were running spray.

Did NASCAR ever allow the 4500 series carberator?   The fuel injection throttle body is 4500 series based...  But in my short knowledge of the sport the carb of mandate had been the 4150

In modern day no..it was always a 4150 based deal.
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Re: pro systems carb

Post  Lem Evans on January 28th 2015, 10:02 pm

Yep, it was always 4150 except when it wasn't Laughing

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Re: pro systems carb

Post  yellowhorse7 on January 29th 2015, 7:55 am

yellowhorse7 wrote:
kim wrote:
Lem Evans wrote:Dominators are no longer legal in NASCAR and they have long since caught the guys that were running spray.

Did NASCAR ever allow the 4500 series carberator?   The fuel injection throttle body is 4500 series based...  But in my short knowledge of the sport the carb of mandate had been the 4150

In modern day no..it was always a 4150 based deal.
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Re: pro systems carb

Post  Lem Evans on January 29th 2015, 10:31 am

"Did NASCAR 'EVER' allow the 4500 series carberator"

That was the question.....ever is a long time. No mention of modern.

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Re: pro systems carb

Post  Curt on January 29th 2015, 11:09 am

Lem Evans wrote:"Did NASCAR 'EVER' allow the 4500 series carberator"

That was the question.....ever is a long time. No mention of modern.

Damn Kids!!! Evil or Very Mad Laughing
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Re: pro systems carb

Post  Curt on January 29th 2015, 12:18 pm

Holley:   the leader in fuel delivery that developed and introduced the original Dominator® for NASCAR® racing and took carburetion to another level in 1969,
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Re: pro systems carb

Post  kim on January 29th 2015, 12:30 pm

Guess they did at least for a short time.   I was only 6 yrs old in 69.  Probably already block sanded a 55 chevy at time.

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Re: pro systems carb

Post  Lem Evans on January 29th 2015, 1:04 pm

Curt wrote:
Holley:   the leader in fuel delivery that developed and introduced the original Dominator® for NASCAR® racing and took carburetion to another level in 1969,


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Re: pro systems carb

Post  chuck on February 1st 2015, 7:23 pm

Changed to a qf1250, car ran a 5.86 @ 117. With the Pro Systems 1250 the best was 6.10 @ 115. Thanks Lem and Phil.

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Re: pro systems carb

Post  chuck on February 1st 2015, 7:24 pm

This was on motor.

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