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Post  chuck on Sun Jan 25, 2015 9:01 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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Post  whatbumper on Sun Jan 25, 2015 9:43 pm

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

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Post  DaveMcLain on Mon Jan 26, 2015 7:50 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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Post  D. Sea on Mon Jan 26, 2015 10:52 am

My Pro does not have power valves.
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Post  whitefield on Mon Jan 26, 2015 11:28 am

power valve or no power valve depends on aplication an intended use .
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Post  chuck on Mon Jan 26, 2015 11:43 am

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

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Post  nickbay on Mon Jan 26, 2015 4:30 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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Post  Lem Evans on Mon Jan 26, 2015 8:20 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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Post  hienergy557 on Tue Jan 27, 2015 8:11 pm

PV's are for fuel economy. Get rid of it.
No use on a race engine.
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Post  DaveMcLain on Wed Jan 28, 2015 8:09 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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Post  kim on Wed Jan 28, 2015 11:06 am

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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Post  Lem Evans on Wed Jan 28, 2015 12:44 pm

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

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Post  kim on Wed Jan 28, 2015 1:17 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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Post  Lem Evans on Wed Jan 28, 2015 2:16 pm

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

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Post  bbf-falcon on Wed Jan 28, 2015 4:44 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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Post  yellowhorse7 on Wed Jan 28, 2015 6:14 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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Post  Lem Evans on Wed Jan 28, 2015 9:02 pm

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

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Post  yellowhorse7 on Thu Jan 29, 2015 6:55 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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Post  Lem Evans on Thu Jan 29, 2015 9:31 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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Post  Curt on Thu Jan 29, 2015 10:09 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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Post  Curt on Thu Jan 29, 2015 11:18 am

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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Post  kim on Thu Jan 29, 2015 11:30 am

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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Post  Lem Evans on Thu Jan 29, 2015 12:04 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,

pro systems carb Holley%20001%20Large_zpscfpgk5xf

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Post  chuck on Sun Feb 01, 2015 6:23 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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Post  chuck on Sun Feb 01, 2015 6:24 pm

This was on motor.

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