Pro systems SV1 problems

Bosskk1786 wrote:Hello all I have an SV1 on my 545 inch boss 429. Runs great on the top end but stumbles and misses between 3000-3500 rpm.... Running a kaase 4150 and the pro systems spacer. It's 110mm blade flow 1200cfm. When it gets to that rpm it's almost like the engine stalls.... This is only under wot. Any ideas?....  I've made 4 passes on it so far and it stumbled every time... Put my Holley 1000 with annular boosters on and it runs perfect and feels way stronger.... If I can figure out how to upload my passes from my GoPro you can watch the engine stumble.... Thanks for any help in advance.... Joe

DanH wrote:You check the fuel pressure and the float level?  Let up on the throttle then back on. Could be it gives it time to fill the bowls.

BOSS 429 wrote:

Bosskk1786 wrote:Hello all I have an SV1 on my 545 inch boss 429. Runs great on the top end but stumbles and misses between 3000-3500 rpm.... Running a kaase 4150 and the pro systems spacer. It's 110mm blade flow 1200cfm. When it gets to that rpm it's almost like the engine stalls.... This is only under wot. Any ideas?....  I've made 4 passes on it so far and it stumbled every time... Put my Holley 1000 with annular boosters on and it runs perfect and feels way stronger.... If I can figure out how to upload my passes from my GoPro you can watch the engine stumble.... Thanks for any help in advance.... Joe

Call me sometime, I work with those a lot,and im a dealer for pro systems

Curt wrote:My first question would be, why would you put an SV1 on a street car?  They barely work on an all out performance car.

Curt wrote:My first question would be, why would you put an SV1 on a street car?  They barely work on an all out performance car.

dfree383 wrote:

Curt wrote:My first question would be, why would you put an SV1 on a street car?  They barely work on an all out performance car.

That's my point they are more of a race car thing IMO. Kinda like trying to run a Rons toilet on a grocery getter.....

BOSS 429 wrote:

Curt wrote:My first question would be, why would you put an SV1 on a street car?  They barely work on an all out performance car.

I sure hope it moves enough air! Lol.... If not we'll get it there!




we dont have a prob with them ON STREET CARS, unless the engine does not move enough air for one , as in HP.

Bosskk1786 wrote:

dfree383 wrote:

Curt wrote:My first question would be, why would you put an SV1 on a street car?  They barely work on an all out performance car.

That's my point they are more of a race car thing IMO. Kinda like trying to run a Rons toilet on a grocery getter.....

why not run an SV1?.... When I talked with Patrick I gave him all my specs and told him it would be a street/ strip car. I'm sure if he didn't think it was a good idea to run an SV1 he would have steered me in a different direction... let's no forget a boss 429 was a detuned race engine!

dfree383 wrote:

Bosskk1786 wrote:

dfree383 wrote:

Curt wrote:My first question would be, why would you put an SV1 on a street car?  They barely work on an all out performance car.

That's my point they are more of a race car thing IMO. Kinda like trying to run a Rons toilet on a grocery getter.....

why not run an SV1?.... When I talked with Patrick I gave him all my specs and told him it would be a street/ strip car. I'm sure if he didn't think it was a good idea to run an SV1 he would have steered me in a different direction... let's no forget a boss 429 was a detuned race engine!

You missing the point, Real race cars a generally not operating like a street car or running as low as your having problems at.

I'm not saying anything bad about Patrick, i like the guy, but the SV1 carbs just don't work on everything from what I've seen over the years

Bosskk1786 wrote:

dfree383 wrote:

Bosskk1786 wrote:

dfree383 wrote:

Curt wrote:My first question would be, why would you put an SV1 on a street car?  They barely work on an all out performance car.

That's my point they are more of a race car thing IMO. Kinda like trying to run a Rons toilet on a grocery getter.....

why not run an SV1?.... When I talked with Patrick I gave him all my specs and told him it would be a street/ strip car. I'm sure if he didn't think it was a good idea to run an SV1 he would have steered me in a different direction... let's no forget a boss 429 was a detuned race engine!

You missing the point, Real race cars a generally not operating like a street car or running as low as your having problems at.

I'm not saying anything bad about Patrick, i like the guy, but the SV1 carbs just don't work on everything from what I've seen over the years

I understand.... I'm willing to buy a dominator be it another pro systems or quick fuel... I spent a lot of money on this carb was just hoping to make it work on my application is all. I did a lot of research on these before I bought it and all the stuff I read said how clean and crisp the throttle response was...

68galaxie wrote:You should chat with bbcoupe (the Aussie guy with a 545" Aussie Falcon 10.47@133 4000 lbs)
He runs a Prosystems SV1. His car seems to run very well on the street and track.

Perhaps pick his brain on the set-up for his SV1.

dfree383 wrote:

Bosskk1786 wrote:

dfree383 wrote:

Bosskk1786 wrote:

dfree383 wrote:

Curt wrote:My first question would be, why would you put an SV1 on a street car?  They barely work on an all out performance car.

That's my point they are more of a race car thing IMO. Kinda like trying to run a Rons toilet on a grocery getter.....

why not run an SV1?.... When I talked with Patrick I gave him all my specs and told him it would be a street/ strip car. I'm sure if he didn't think it was a good idea to run an SV1 he would have steered me in a different direction... let's no forget a boss 429 was a detuned race engine!

You missing the point, Real race cars a generally not operating like a street car or running as low as your having problems at.

I'm not saying anything bad about Patrick, i like the guy, but the SV1 carbs just don't work on everything from what I've seen over the years

I understand.... I'm willing to buy a dominator be it another pro systems or quick fuel... I spent a lot of money on this carb was just hoping to make it work on my application is all. I did a lot of research on these before I bought it and all the stuff I read said how clean and crisp the throttle response was...

Call Patrick up he's always willing to help, like I said earlier probably just needs some tuning

nickbay wrote:He has a website that he answers quite quickly.
http://prosystems.websitetoolbox.com/

Bosskk1786 wrote:

nickbay wrote:He has a website that he answers quite quickly.
http://prosystems.websitetoolbox.com/

thanks I forgot about that.. I'll have to find my build# and ask some questions

Bosskk1786 wrote:

68galaxie wrote:You should chat with bbcoupe (the Aussie guy with a 545" Aussie Falcon 10.47@133 4000 lbs)
He runs a Prosystems SV1. His car seems to run very well on the street and track.

Perhaps pick his brain on the set-up for his SV1.

thanks for the tip!.... My mustang is at about 3800lbs... Fastest trap speed so far on my GPS is 131 at the airport we drag at they don't have timing equipment yet. That's with the carb acting up. It's a no prep race so I gotta leave soft to keep from blowing the tires off it

bbcoupe wrote:

Bosskk1786 wrote:

68galaxie wrote:You should chat with bbcoupe (the Aussie guy with a 545" Aussie Falcon 10.47@133 4000 lbs)
He runs a Prosystems SV1. His car seems to run very well on the street and track.

Perhaps pick his brain on the set-up for his SV1.

thanks for the tip!.... My mustang is at about 3800lbs... Fastest trap speed so far on my GPS is 131 at the airport we drag at they don't have timing equipment yet. That's with the carb acting up. It's a no prep race so I gotta leave soft to keep from blowing the tires off it

Hi,
I've had an SV-1(95mm 1100cfm) on my 545ci street car for 7 years and it has done everything I asked for out of the box, have tried a few changes but end up back as Patrick built it. Patrick has always been happy to offer me assistance via direct contact or many forms of social media.
I only get to race a couple of days a year and average around 5000 miles a year cruising.
The only thing I've found is they are sensitive with fuel pressure and float settings, do you have a fuel pressure gauge in the car?