Power plates

["Turbo-T"]

Looking at a power plate, I see the rear holes are smaller than the fronts.

I take it the issue here is the rear cylinders get most of the air flow as opposed to the front cylinders when the intake is not fitted with a power plate?

 

[IronCityTurbo6]

You are correct. The rear cylinders get more air than the front, thus causing a lean condition. You will lose 2-3 lbs of boost when you install it you will have to turn it back up, making the turbo work harder, which will make your intake charge hotter. I took mine off and I don't miss it. I'm seeing less knock retard without it. Just my .02.

 

["Turbo-T"]

Ok.

I just ordered one as I have heard they help cut down on KR.

At first looking at the plate it looks really restrictive, but I thought someone told me it keeps the rear cylinders from getting more air than the fronts which is supposed to help keep everything balanced in terms of air flow.

 

[Just a Six??]

Ok.

I just ordered one as I have heard they help cut down on KR.

At first looking at the plate it looks really restrictive, but I thought someone told me it keeps the rear cylinders from getting more air than the fronts which is supposed to help keep everything balanced in terms of air flow.

You would be correct & there are many who use them, have tested them & it seems they work. I run one without issue.

 

[NJ Torque]

I run one.... 20 PSI on pumpgas...

Not a stock turbo of course, but it does help.

 

["Turbo-T"]

Exactly how much do they help with keeping the KR down?

 

[NJ Torque]

Even out the airflow so the front cylinders don't run lean

 

["Turbo-T"]

If the air was all going to the back wouldn't the rear cylinder be the ones running lean?

I mean I am thinking if the fronts wern't getting enough air wouldn't that make them rich?

And if the rear cylinders were getting all the air wouldn't that allow the cylinders to gain a little more air than needed making them lean?

 

[BlackMetal]

Exactly how much do they help with keeping the KR down?

After I addressed my knock issue by upgrading the fuel system, changing filters and sensors etc, I would still get 2, 3, sometimes 5 degrees of knock retard according to the scanmaster.

Installed the PowerPlate and never saw anything over 0.5.

I didn't see any change in boost and highly doubt a plate makes the turbo work that much harder that you'd see MORE KR because of hotter charge air. Maybe they just had a bad experience with theirs, unless they want to back it up that claim with air temp readings and evidence of the plate robbing you of 3 lbs of boost, I wouldn't worry about it.

If the air was all going to the back wouldn't the rear cylinder be the ones running lean?

I mean I am thinking if the fronts wern't getting enough air wouldn't that make them rich?

And if the rear cylinders were getting all the air wouldn't that allow the cylinders to gain a little more air than needed making them lean?

Yes, you said it correct way back at the beginning of the thread. The shape of the plenum and the way the air enters, the pressurized air slams to the back of the plenum and floods the rear cylinders, leaning them out, and those cylinders are most likely to experience detonation.

 

[BlackMetal]

Bottom line if it didn't do what it advertises, if my engine still detonated, if it INCREASED detonation, or was such a restriction that it was suffocating the turbo, it wouldn't still be on my car. I recommend it.

Just look at the data from the tests they did on the RJC product website. Pretty convincing numbers.

Flow Comparison

 

[87NAT]

The square area of the all the holes in the RJC plate add up to more area than the opening in the throttle body. How can that be a restriction?

I know of more than a few cars running 10's with them. I personally like mine and dont see any down side to it. And yes the Flow Comparsions show the scientific results of close to "equal" air distribution on all 6 cylinders. Jason@ RJC did his homework before he marketed and sold this mod.

 

["Turbo-T"]

I took a look at that website and am not sure how to decipher those numbers. Why are the numbers lower with the plates installed?

 

[87NAT]

I took a look at that website and am not sure how to decipher those numbers. Why are the numbers lower with the plates installed?

What it shows is a stock plenum has 149% flow difference(total) between all cyl. With the RJC plate there is only a 10% flow difference. Look at how much air is getting to the back cyl without the plate. The plate equals it out as best as possible.

 

[BlackMetal]

I took a look at that website and am not sure how to decipher those numbers. Why are the numbers lower with the plates installed?

The number is "flow RANGE", which means the difference between flow between different cylinders. You want the range, or variation, to be low, meaning all cylinders are seeing about the same amount of air.

When they did the flow test, they picked a certain amount of air flow as the average, and made that their "zero" point. The test scale went all the way down to -100% and all the way up to +100%.

So, looking at the stock plenum, cyl 2 (front of plenum) flowed -81% of the standard number. Cyl 5 (rear of plenum) flowed +68%. Add those numbers together and you get 149% different between the two. Not good.

With the power plate, all cylinders are within +/- 5%, and the biggest variation you get is around 10%.

 

[87NAT]

The number is "flow RANGE", which means the difference between flow between different cylinders. You want the range, or variation, to be low, meaning all cylinders are seeing about the same amount of air.

When they did the flow test, they picked a certain amount of air flow as the average, and made that their "zero" point. The test scale went all the way down to -100% and all the way up to +100%.

So, looking at the stock plenum, cyl 2 (front of plenum) flowed -81% of the standard number. Cyl 5 (rear of plenum) flowed +68%. Add those numbers together and you get 149% different between the two. Not good.

With the power plate, all cylinders are within +/- 5%, and the biggest variation you get is around 10%.

Hey thats what I said...you just used big words.

Like the new user name.

 

[toofastforyou]

You are correct. The rear cylinders get more air than the front, thus causing a lean condition. harder, which will make your intake charge hotter. I took mine off and I don't miss it. I'm seeing less knock retard without it. Just my .02.

No...The turbo won't "work harder"... What it does is making the mixture more EVEN in all six cylinders, and has nothing to do with the turbo. You might want to enrichen the mixture a little bit if you see it's running lean though. If there is a lean condition while using a plate, it'll be lean EVENLY and putting more fuel will solve that problem EVENLY through all six cylinders too. Keep in mind that it's definitely NOT the plate's fault if an engine is running lean. It's more likely to be because you have too much boost OR there isn't not enough fuel, period!

Keep it!:wink:

Claude.

 

[notacarlo]

Same amount of boost....it equalizes the air pressure to all six cylinders. It most definitely does reduce knock. I experienced no change in the amount of boost before or after.

It is worth the money by far. I have had one since Jason came out with his version. There had been other attempts at equalizing flow, but RJC did good research and came up with the best solution.

Some can claim that they get no kr with 5-6 psi over stock and that is because of supporting mods and the proper tune.

 

[xrunner123]

The square area of the all the holes in the RJC plate add up to more area than the opening in the throttle body. How can that be a restriction?

Whenever air changes direction it causes a restriction. But the benefits of knock reduction outweigh this restriction.

 

[toofastforyou]

Whenever air changes direction it causes a restriction.

Not sure about that. My late father was an engineer who worked his whole life in air conditioning, ventilation and air handling once explained to me that "handling" air was similar to "handling" water. If air hits a wall, it splashes in every direction, the same way as water would, but if you redirect air evenly, the overall effect on flow will increase, the same as with water. This is what the power plate does inside the intake manifold. Also, increasing flow means that the engine ingests more air, this combined with the right amount of fuel added = more power. Simple as that.

Claude

 

["Turbo-T"]

Well I hope Cottons carries the authentic RJC plates cuz that's who I ordered mine thru.