To use an RJC power plate or not

Toby_Goodmk

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Dec 9, 2011
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I have a heavily ported engine. Please see details in signature below. I feel for the most part, besides going stage 2 the engine is about as open as one could want. At this level is a power plate beneficial? Or possibly a hindrance? Nothing against the product, but I would imagine after a certain point adding things for better flow because of factory restrictions are no longer needed??? Yes, no???
 

SS/GN

Well-Known Member
Jun 30, 2005
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Toby
I don't know if the search function is working right now because it was down for a while. If so search and look at the opinions, I think in your case the only way to know would be A-B-A testing. I know Jason still has one in his TSM car and a few others still use them in the high 9 second range. Just an idea
 

Toby_Goodmk

Test Fit officianto
Dec 9, 2011
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Was able to speak with Sod at Hyetech. Take it out! lol...no ditch on Jason's products but Sod designed the upper plenum. Doesn't need a PP. Anyone need a Precision PP???? lol....
 

vader87

Protected Freedom for 27 years! Thank a Veteran!
Nov 2, 2005
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All the plate does is aid in the even distribution of air on all 6 cylinders. The rear cylinders tend to lean more quickly than the front ones as the air is being pushed so fast and hard that more of the compressed air dumps directly into the rear two intake runners. Personally, I would think the air being evenly distributed to all 6 cylinders far out weighs the little, if any, restrictions the plate may cause. Just my $.02
 
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Toby_Goodmk

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Dec 9, 2011
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according to RC test..let me see if I get this right.

#1 intake runner is the same
#2 is opened up 10
#4 is opened up 5
#3 is restricted 5
#5 is restricted 15
#6 is restricted 9


So for what is opened up front by 15 cf the rear is closed off 29 cf?

I cannot see why one would use it, as there is no even distribution.
 

blklt1z28

Member
Jul 6, 2012
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I've contemplated this myself. I've done two head gaskets on my car and cracked one piston. Both HG were the pass side center cylinder and same piston ended up cracking after cometic's and head studs were used. Granted, every time it blew it was self inflicted from detonation, not from being pushed too hard. Still strange that cylinder gets all the abuse. I have a PP on my stock intake/plenum.
 

earlbrown

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May 26, 2001
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Odd. I've cracked 4.1 hypers twice on my build with a PP. The first time it was he drivers side front and middle. The second was the drivers side again.


Keep in mind it can't be an actual flow restriction if the openings are greater than a 2.5" up pipe or whatever throttle body you're using. (or if you add up all the puny areas of the intercooler flues)
 

3.8L V-8 eater

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Jul 22, 2006
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I would gather that you will have opinions both ways on this topic, but I'm guessing most guys with a build similar to yours aren't using one.....
 

murphster

Well-Known Member
Feb 15, 2003
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Doesn't seem like you fully understand what the PP is doing. With that turbo you will not run into any flow restrictions with the PP. In the absence of any further data you have for your combo I would keep it on. I still have one on my car.

Also, RCs flow data supports that the PP does what it says it does. Decent alternatives would probably be a using a plenum spacer or Hemco with a spacer if you are worried about flow restriction and want to push 700rwhp. Less than that I wouldn't worry about it.
 

toofastforyou

2FAST4U
May 25, 2001
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In theory, the plate is supposed to equalize air flow by restricting air in some cylinders and redistributing it into others. I'm not using on my car and I have doubts that having one would make a noticeable difference in performance.:rolleyes:

Claude. ;)
 

larrym

West Coast Newfy
Jul 17, 2007
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The performance gain is the ability to add a couple pounds of boost when you don't have a couple lean cylinders starting to detonate before the engine is lean across all
 
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Mr.Spool

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Nov 6, 2006
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I cannot see why one would use it
If you do your own tuning and pull the plugs you would see the benifit of the plate especially on a pump gas alky car.the plugs are alot more uniform with the plate.I have also done back to back testing at the track and found the plate very usufull in real world driving.there are ways to make the power without the plate.I have seen combo's run fast with and without.
 
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earlbrown

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May 26, 2001
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If we had the ability to tune each cylinders A/F independently in real time, the PP would in fact be useless. But we don't.

As soon as one hole starts acting up, that's the end of the tune. That means there's additional holes with more to give (giggity). Why deprive them?
 

TURBOWNER

INDY V6
Jul 29, 2010
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Old post, but what we did before the power plate was flow check sets of injectors (50lb at the time) and find 2 that were much higher in flow and never leaned out the back 2 cylinders! The power plates solves this on most all intakes...we always run 28-29lbs of boost...also used Loc-Wire head gaskets until RJC came out with their Bulletproof head gaskets. Both items work as described. I was running high nines on a 109 block in the 90's. Blew ONE head gasket once. Street raced and drag raced hundreds of passes. Always ran 75% C16 and 25% pump premium before meth came out. Our meth was called a 7th injector! Jason's stuff works. Period
 

Mr.Spool

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Nov 6, 2006
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the plate directs airflow to all the cylinders,so the back isnt overwhelmed with air.individual cylinder correction will allow more fuel to the overwhelmed cylinders but that is not an airflow correction you just wont lean out the back.the plate will help spread the air and give each cylinder the chance to make more horsepower.there are other ways to achieve this but the plate inmo is the easiest way.
 

SS/GN

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Jun 30, 2005
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The plate just works, back to back tested on Cals dyno then track tested by a real Grumpy old guy. Don't ask how I know.:)
 
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