Removing Hemco plenum..Am I crazy?

[87NAT]

I purchased my car many years ago with a Hemco plenum already installed. After reading about the RJC power plate for a couple of years now I have decided to put back a stock plenum with the power plate. (There is no power plate for the Hemco)

I have been told by a few people that this is a mistake. I respect everyones opinion...I just want some more...good or bad. I hate to resurrect an old topic but some current info would be helpful.:redface:

Will I be digressing when I install the RJC plate or will I just break even and not notice a difference from the Hemco alone?

 

[matswtt]

Mine came with one also, do a back to back test.
If there was some one around with a stock plenum and i could try it with a power plate and without over my hemco id let everyone know.

Im sure that RJC has its done its own tests. And untill i fall on 450.00 i'll keep my hemco?

 

[unix_punk]

dunno if this helps you decide...Ive never used a Hemco, but I think I would stick with it since you already have alky to assist in reducing detonation...

Flow Comparison

 

[PaCemkr86]

i run hemcos on both my TR's and really like them alot

but here is some excellent info here

Plenum Comparison

 

[baknblk]

hemco

I run the Hemco as well as a Hemco air distribution set up in the bottom of my intake. Years ago at a Michigan Turbo Club meeting he brought one and it just made more sense to me. I have no idea what its called and do not think he makes them anymore, but it definitely made a big difference along with the upper and porting. There are a lot of people who have success with the RJC, for me it seemed that plate restricts air flow compared to unrestricted air being redirected. I have never done any testing or research just my opinion.

 

[Quick6'n'-K.C.]

No your not crazy at all, i sold my hemco, put the stocker back on and put a powerplate on. Filled the tank and bought a 30 pack of beer with the rest of the money.

If i could do that everyday, i wouldnt have to wake up at 5:30am everyday:biggrin:

BW

 

[GNVYUS 1]

The fact that Bamford's tests match what RJC put out should say a lot. Even if the plate did restrict flow the fact that each cylinder is now matched means you can pound in more air and tune much more accurately to the edge.

 

[87NAT]

Well if I do decide to sell the HEmco how much are they going for?

 

[brian]

Well if I do decide to sell the HEmco how much are they going for?

The Hemco`s flat out do not work! I will go $30 shipped.:tongue:

Brian

 

[BlackBandit]

I have a hemco and I'm going to do a back to back (with a stock plenum/pp) if I ever get this thing ready. The only problem is I only have a stock throttle body so I don't think there will be a big difference in overall flow. It'll be interesting to see if there's a power difference. Unfortunately this won't be for several months.

 

[wyominggun]

The Hemco`s flat out do not work! I will go $30 shipped.:tongue:

Brian

It dont work but he will buy it. Sounds fishy

 

[PaCemkr86]

if Brian backs out, put me second in line , ill even go 30.99 shipped
i know the Hemcos dont work, but i like the way they look on my engine

 

[Quick6'n'-K.C.]

can we get more pictures of your turbo coolant lines?

BW

 

[PaCemkr86]

sure what part would u like to see. there are more pics in my sig

 

[Quick6'n'-K.C.]

The coolant line into the lower rad hose for the BB turbo.

I was just wondering how you splice it in there.

Looks great, been to the track and getting better times?

BW

 

[baknblk]

The fact that Bamford's tests match what RJC put out should say a lot. Even if the plate did restrict flow the fact that each cylinder is now matched means you can pound in more air and tune much more accurately to the edge.

I am not trying to create a pissing match just a couple of questions from a big dummy. How does covering a hole almost in half not restricting air ? What is the quality of air after hit passes through these slots ? What is happening to the air that is being restricted above the plate ? Why in Nascar do they cover some of the inlet with a re stricter plate to rob horsepower but it is not robbing the Buick's horsepower ? I believe that it changes the flow to each cylinder but at what cost ? People spend all this money on making more air flow by changing heads, intakes, porting and polishing and then put this plate in that seems to me restricts air. Please help me out here I would just like to understand and to be sold on it.

 

[PaCemkr86]

The coolant line into the lower rad hose for the BB turbo.

I was just wondering how you splice it in there.

Looks great, been to the track and getting better times?

BW

gonna let it rip at the Noble evet

 

[GNVYUS 1]

I am not going to get into a flow restriction arguement but RJC has this
ADPP Questions.

If you don't believe it, you can use other tests like Bamford's EGT that back up the plates effectiveness which would make RJC's flow claims within the realm of honest test results.

I would sacrifice a couple of % in flow to get equal distribution in a forced induction vehicle any day.

 

[87NAT]

I am not going to get into a flow restriction arguement but RJC has this
ADPP Questions.

If you don't believe it, you can use other tests like Bamford's EGT that back up the plates effectiveness which would make RJC's flow claims within the realm of honest test results.

I would sacrifice a couple of % in flow to get equal distribution in a forced induction vehicle any day.

That is exactly what I am trying to do...arrive at a more equal flow for tuning and high boost safety measures than the Hemco alone can achieve. I understand Brian's point about the Hemco but I would like to try some new technology and see if it makes a differnece. Thats all.

As far as me being "stupid" about what they sell for...I am sorry. I just was asking a simple question and not wanting to screw anyone on the boards by asking too much. I guess since I am dead wrong about the RJC plate I better keep the Hemco in case my car slows to a 13.6@89 mph...

 

[Jerryl]

I am not trying to create a pissing match just a couple of questions from a big dummy. How does covering a hole almost in half not restricting air ? What is the quality of air after hit passes through these slots ? What is happening to the air that is being restricted above the plate ? Why in Nascar do they cover some of the inlet with a re stricter plate to rob horsepower but it is not robbing the Buick's horsepower ? I believe that it changes the flow to each cylinder but at what cost ? People spend all this money on making more air flow by changing heads, intakes, porting and polishing and then put this plate in that seems to me restricts air. Please help me out here I would just like to understand and to be sold on it.

I think ...................
NASCAR restrictor plates have XX sq inches of opening and is in fact "the" restrictor in the total airflow (Theory of constraints).
The RJC PP has a larger total opening (Sq Inches) than the throttle body, and is therefore NOT the restrction in the air inlet.

NASCAR also uses NA engines, and the air is "sucked through" the restrictor plate. In our engines, the air is "blown through" the restrictor plate.

The ability to "equalize flow" in the +-30% range far outweighs the benefits of the "small restriction changes in flow" (if that is anyone's theory), since the weakest cylinder (link) is now stronger.
Equalized flow is the same reason head porters and intake system designers spend years to get the flow within 1-3% of each other.
It is why some spend a LOT of $$$$ on "equal length headers", "Balanced flow intakes", blah blah ..............

I think .............................