Some new vids

[LEMHEAD16]

Well, when you want to get rid of that blower

[kingkilburn]

By increasing flow you increase power without needing to increase psi. You're giving it more oxygen to burn with out pressurizing it as much. That means less heat from your blower, which in turn means more oxygen.

There is a balance to be struck some where in there. You may very well get better results by sticking with the heads and cams you haven't installed yet rather than forcing more air in with a bigger blower.

[gs14racer]

i understand that, but remember that the supercharger spins at a fixed rpm, so if you increase flow through the motor, then spinning the supercharger at the same rpm would decrease the boost, so likely i would have to turn the supercharger closer to its redline to see the same boost im seeing now resulting in hotter intake temps.

Or am i completly wrong here.

[kingkilburn]

The true variable to look at is air flow. If you can flow more at a lower psi you will be making more power with less stress on the system.

It would be great to see where flow and psi for your blower plot on a graph.

[SuperHatch]

The true variable to look at is air flow. If you can flow more at a lower psi you will be making more power with less stress on the system.

It would be great to see where flow and psi for your blower plot on a graph.

The engine air flow is the variable here, not the blower air flow. Jerry was right when he said that if he increases airflow through the motor and changes nothing with the blower, the boost pressure should go down. To re-establish the previous boost pressure he would need to spin the blower faster, increasing heat.

I've seen this numerous times on stock turbo'd Evos. People throw in cams and the boost pressure goes down, power goes up, and then they wonder how that's possible. The reason boos pressure goes down is because most stock turbo'd Evos are pushing the turbos to the limit, if VE increases the turbo can't keep up.

Boost pressure read at the manifold is the resistance to airflow in the motor. You're monitoring the backpressure of air that isn't making it through the cylinders on each cycle of the engine. If you cam a motor and successfully increase VE, than more airflow makes it into the cylinder and less residual is left in the intake manifold, "lowering" the boost pressure. The key point is that more air made it into the cylinder, which the cylinder is where the power is made, not the intake manifold. If you put a pressure transducer on the cylinder, the pressure would either be the same or higher.

As far as which puts less stress in the engine, that is debatable.

On a centri-blower, the heat generated is almost exclusively related to how fast you're spinning the blower. Faster compressor wheels shear through the air at a higher rate causing more friction and more heat. A bigger comp wheel needs to turn slower to move the same volume of air as a small compressor wheel. Volume, as you stated, is what really matter here. Boost is generated by one pump (the S/C) moving a higher volume of air than another pump (the engine) can accept it. That all goes back to increasing the VE of the engine without changing the pump rate of the blower (which is directly related to pulley size) will result in less boost.

[kingkilburn]

That is why I would love to see a graph or numbers for the flow vs psi for his blower. I think he would be able to reduce or at least retain his current compressor speed to keep the same or similar performance.

I think the engine would be beastly with the heads and cams installed.

[SuperHatch]

That is why I would love to see a graph or numbers for the flow vs psi for his blower. I think he would be able to reduce or at least retain his current compressor speed to keep the same or similar performance.

I think the engine would be beastly with the heads and cams installed.

I think that's what you're not getting. There is no flow vs psi graph. There is just flow, blower RPM and flow. PSI is generated by the blower flowing more air than the engine can injest. The resulting backpressure in the intake system is the boost level.

For a given blower RPM, the engine will injest more air on every revolution with the heads/cams installed. The boost pressure will go down, but on every stroke of the motor more air will make it into each cylinder and theoretically (practically for that matter) more power will be made.

I agree, the heads and cam would make a big difference, but there is more to it than just heads and cams, that's all.

[gs14racer]

My friend juan has some good in car footage from when he followed me

http://www.youtube.com/watch?v=JdzIwwWgw7U

http://www.youtube.com/watch?v=UALn4tANXhE

http://www.youtube.com/watch?v=jVvFKL2aXiM

[kingkilburn]

I guess I will concede defeat. lol

I can't seem to find the words to explain what I mean but you both look to have handle on this whole VH thing.

[SuperHatch]

I guess I will concede defeat. lol

I can't seem to find the words to explain what I mean but you both look to have handle on this whole VH thing.

lol, no concession needed. I'm just trying to make sure you understand where I'm coming from, that's all.

Just so you know, there is some truth to what you're getting at. At X RPM a blower will flow more air with 0psi restriction on the outlet versus a 20psi restriction due to pumping losses, but I've been ignoring that due to the negligable difference in pumping losses at 5psi vs 6psi... Anyway, hope you had a Merry Christmas!

[Loch Ness]

2 T28 BB turbos 10psi should keep u from drifting

[SuperHatch]

2 T28 BB turbos 10psi should keep u from drifting

1st - He is drifing on purpose, which if I hadn't read the other posts you've made today I would think you already knew that but were just trying to be funny, but after reading the other nonsense I don't think that's the case.

2nd - You already looked at Jerry's other thread and replied, so you know or should know that his car is already supercharged, so your post makes even less sense. Unless you're implying that the lag from the turbos would make the car less likely to drift, which definitely wouldn't be the case with two turbos that small.

3rd - I'm not trying to be the guy that isn't nice to the newbies here, especially since you actually know one thing or another about the VH. Just do us all a favor and read before you post in a thread, it saves us the annoyance and it saves you the inconvenience of looking like an ignorant fool that just wants people to google the company in your signature.

[Loch Ness]

i was referring to torque produced and tires.......high torque off idle eats the crap out of tires.......not a noob to the VH....not bashing on Jerry

[gs14racer]

lochness you got to remember the chassis weight as well, these are sub 2800lb cars, and in these cars anything over 300lbft of tq after 5000 rpm is well enough to get the car sliding at the TOP of third gear with no problems, even my sr20 would spin the tires at the top of third when i was a 365 whp 320 wtq.

in case you missed it

[Loch Ness]

i was joking about the not drifting.......TT just makes a lot of torque early in the RPMs.......eats tires really easy.......wasnt bashing you......

[Loch Ness]

450zxtt loves this cold Georgia weather