Rjc plate

[Dr.drivability]

Does the RJC plate cause issues in the higher horsepower cars??

 

[Dr.drivability]

Does the RJC plate cause issues in the higher horsepower cars??

I know there are opinions out there!!!!

 

[QUIP'6']

nope!!!!! evens out air distribution

 

[BlackMetal]

I'm sure there's some people who would say at a certain performance level it becomes more of a restriction. Has any testing been done to prove it? Probably not. I'm not sure myself.

 

[79TurboCutlass]

I'm sure there's some people who would say at a certain performance level it becomes more of a restriction. Has any testing been done to prove it? Probably not. I'm not sure myself.

I have heard that it becomes a restriction. This was shown on a dyno.

 

[ROYAL_6]

I have heard that it becomes a restriction. This was shown on a dyno.

Are we talking about in every level/application? in what level does it start to bigin to to become a restriction?? 12s, 11s, 10s, 9s??? On stage motors?? strokers?? big turbos???

 

[REAPER231]

Are we talking about in every level/application? in what level does it start to bigin to to become a restriction?? 12s, 11s, 10s, 9s??? On stage motors?? strokers?? big turbos???

I THINK WHEN YOU GET IN THE LOW TENS OR 9'S . MY BUDDY WENT 9.7 'S WITHOUT IT , WAS GOING TO PUT IT IN AND SEE IF IT SLOWS DOWN NEXT TIME OUT .

 

[scottk]

didnt do a thing for my car!!!!!!!!!!!!!!! 12.11@113mph

 

[MSDGN]

Ask Jason C...who developed the plate...his car runs 9.6 with the plate...

 

[8AV8]

Ask Jason C...who developed the plate...his car runs 9.6 with the plate...

 

[TurboBuRick]

Does the RJC plate cause issues in the higher horsepower cars??

It's hard to say with no scientific study but the way every one talks about mufflers, why would you voluntarily put a possible restriction plate. You would not put flow master muffs on the car would you?

Allot of thing need to be taken into consideration. IMO, once the pressure equilizes on both sides of the plate, does it still do what is claimed? I am sceptical. Keep in mind, the intake valves do not open all at once. That being said, if the intake is pressurized in boost, the next valve that opens will get the same amount of air as the rest regardless of the diversion plate.


I took mine off recently. Once I get to the track I will see if MPH/times improves.

On a side note, RJC makes great products for the Buick world. I don't think Jason would sell something he did not beleive in.

 

[Turbo6Smackdown]

It's hard to say with no scientific study but the way every one talks about mufflers, why would you voluntarily put a possible restriction plate. You would not put flow master muffs on the car would you?

Allot of thing need to be taken into consideration. IMO, once the pressure equilizes on both sides of the plate, does it still do what is claimed? I am sceptical. Keep in mind, the intake valves do not open all at once. That being said, if the intake is pressurized in boost, the next valve that opens will get the same amount of air as the rest regardless of the diversion plate.


I took mine off recently. Once I get to the track I will see if MPH/times improves.

On a side note, RJC makes great products for the Buick world. I don't think Jason would sell something he did not beleive in.

Never thought about it that way.... Hmmm. Good point. So how would one determine scientifically, that the front two cylinders are leaning out under wot? Maybe a semi stock application with some sort of aftermarket management system, that could check the O2 reading of individual cylinders?
I dont know. Someone give more ideas.

 

[QUIP'6']

the plate is not a restriction at all the purpose of it is that without it when the butterfly is open all the air rushing in the upper intake is crammed to the rear cylinders which leans them out. with the plate it is like moving the butterfly ontop the lower intake. the holes when measured are the same size as the butterfy opening except for the smaller holes in the back which richen up the rear cylinders

 

[xrunner123]

I thought someone scientifically measured EG temps at the header for each cylinder with and without the plate.

 

[xrunner123]

Allot of thing need to be taken into consideration. IMO, once the pressure equilizes on both sides of the plate, does it still do what is claimed? I am sceptical. Keep in mind, the intake valves do not open all at once. That being said, if the intake is pressurized in boost, the next valve that opens will get the same amount of air as the rest regardless of the diversion plate.

Pressure can only 'equalize' if no airflow is present. There's a pressure drop throughout every point in the system. The plate changes the flow pattern so that all cylinders have equal flow. Didn't RJC do all sorts of flow testing?

 

[TurboBuRick]

Pressure can only 'equalize' if no airflow is present.

So your saying 30psi boost in say the intercooler is not the same as 30psi boost in the intake? Hmmmm..

 

[xrunner123]

So your saying 30psi boost in say the intercooler is not the same as 30psi boost in the intake? Hmmmm..

Yes when air is flowing. If it were not it were defy the laws of physics. That's why you want a low restrictive intercooler with a low pressure drop (in addition to good cooling ability). Boost is a few psi higher before the intercooler vs after.

 

[TurboBuRick]

Yes when air is flowing. If it were not it were defy the laws of physics. That's why you want a low restrictive intercooler with a low pressure drop (in addition to good cooling ability). Boost is a few psi higher before the intercooler vs after.

OK then, so your saying that the boost is higher in the plenum than the intake? I highly doubt that. Maybe with the RJC plate it would be.

At certain levels, I will agree that efficiency becomes lost through intercooler but we are talking intake to plenum. I just used a cooler as a example but now I'm glad I did. You just said it yourself, Boost is a few psi higher before the intercooler vs after. Now don't you think that would play true to the intake/plenum with one of these plates?

 

[BlackBandit]

TurboBuRick,

I see what you're saying and you would be correct if things were static in the intake. However things are not static. The fact of the mater is that air has mass and therefore inertia. Take a look at this picture that I have taken time out of my busy day to draw. Assume valve "A" and "B" are the same size and have the same flow capability. The portion underwater represents the intake and the hose represents the airflow into the intake. The water is the air. If you shut the hose off both valves will flow the exact same amount of water because they have the same pressure over them.

Now, if you turn the hose on enough to maintain the water level and start alternately opening the valves valve "A" WILL flow more water because the hose is right over it and the water will want to continue to flow that way because of inertia. Like water, air resists changes in motion.

That said I can't say for sure the PP works or not. Just looking at it it looks like a restriction. However, it's very easy to say you could go faster with a restriction if that restriction enabled you to use ALL of your cylinders to there fullest potential instead of just two. FWIW some of the guys with big blocks at the track sure look like they'd be ALLOT faster than my old Buick.

 

[xrunner123]

Boost is a few psi higher before the intercooler vs after. Now don't you think that would play true to the intake/plenum with one of these plates?

Yes. Whenever air/fluid changes direction there is a pressure drop so yes the plate is a restriction in a sense. But that restriction causes or prevents a lean condition in a few cylinders resulting in more power.