nrmustang

iTrader: (5)

They showed that too.............
The chevelle in the background has a twin turbo'd DURAMAX. The spec card claimed 1000 HP & 2000 lbft.

chuntington101

no it wont make 26 psi! you can just say it will make xxpsi because there are far to many veriables.

you need to remeber that the SC has no presure refferance to anything. all it does is MOVE AIR! the faster you spin it the more air it shifts. now one key factor is the air its sucking in. if there is a restriction before the blower, no matter how fast you spin it, the power will still be lower than without a restriction.

now move the other way. lets put positive presure on the intake side of the blower. and lets say for arguements sake its 14.5psi (1bar). now lets also asume that the SC will move twice the volume of air to the engines demands at WOT. therefore the boost form the SC (with no turbos) will be 1bar also.

so what happens when you put them together??? well you cant just say 14.5+14.5= around about 30psi. what you can say is the supercharger will move twice the air the engine needs. so it will move 2 lots of 14.5psi.

its more comlex than that as you have to think about efficies and stuff but thats basically what happening.

thanks Chris.

chuntington101

thats right mate. as the turbo are more efficent you should see almost the same power as the turbo only guys. you need to make sure the bypass valve(s) are big enough to flow all the air form the turbos though.

i think the lancier (spell) S4 groupe B rally car ran the same idea.

thanks Chris.

cpt_bimes

iTrader: (7)

^Nissan actually made a production car engine with this.

It had a bypass valve in it like N4cer is talking about and the supercharger used an electric clutch like a A/C compressor.

Here's a link to the article. http://www.autospeed.com/cms/A_2216/article.html

MIEric

Wouldnt the supercharger compress the same amount as it did when it was fed by ambient air? Say, compressing the allready compressed air coming from the turbo/s? Not shure how to do the math on it, but say the supercharger boosted to 1 bar when fed by ambient air, then the turbo/s feed 1 bar worth of compressed air into it...wouldnt it compress that air at the same rate it did the ambient air?

red beast

probably....the eaton is a small and crappy supercharger, it's not going to move but so much air which is why most people replace them with larger twin screws...

MonkeyBoneSS

iTrader: (7)

I could only imagine what it wold sound like with a KB unit and the twin turbos!!!!! The scream of DEATH, lol.

lilbuddy1587

iTrader: (1)

Makes good sense, the eaton is not a compressor. Just a "blower". The ability for the blower to move air in quicker will result in spooling the turbo's sooner.

cracker

iTrader: (1)

IATs will be through the roof. Hellion used to claim 1100 rwhp with their 76mm single kit. Then everyone realized it was complete BS.

44psi and lifting heads, i wonder why. Anyone of the turbo companies out there could have bolted up their kits to the blower, but they realized it was reinventing the wheel and this is a gas motor, not a diesel that weighs 6000+ lbs that needs the extra torque to get it moving.

HPP with their twin kit was using 27psi and making 1050 SAE and 1048 Uncorrected. Id love to see their numbers under both circumstances as well as timing, fuel, etc...

Just my opinion of course.

Beaflag VonRathburg

iTrader: (176)

Everyone is getting caught up in the boost / psi matter. The key here is flow. This keeps getting reiterated here, but boost is mearly a measure of restriction. I understand what you are saying and it does make sense. The problem with this system it seems from the high boost / restriction levels aka 44psi is that the blower is acting as a humongous restriction to the turbos. They need something like mentioned above with a bypass valve.

LSxChevelle

iTrader: (4)

They lifted on the 65psi pull...

Slowhawk

iTrader: (12)

We have something very similar at our shop.03 Saleen Cobra which has a twin turbo that put out 800rwhp.Just put the Eaton back on it and adding a better fuel system.

chuntington101

have you had chance to drive it yet?? what are your opinions on this kind of thing?? is it worth it??

thanks Chris.

Slowhawk

iTrader: (12)

I doubt it's worth it but we are doing it anyways.The car already has too much power for the setup.We are working on the fuel system now.

The funny thing is that the car is a 03 Cobra ,Saleen, with the Rainbow,mystic type of paint. I think its the only one they made.

STP

I think its like stuffing 10lbs of **** (two turbos) into a 5lb bucket (1 eaton) 44 psi is a huge restriction and maybe alot of detination because of high air temps because that little intercooler wasnt made to cool that much air. I dont know much but it looks like a joke to me.

Slowhawk

iTrader: (12)

I would think so too but I can see the point of it. With the turbo's that are intercooled,methenol spraying and the roots it should have no turbo lag.We will see in a week or so.

enginjoe

iTrader: (11)

I recently saw a turbo'd cobalt SS results here http://www.srtforums.com/forums/showthread.php?t=337853. It picked up a ton of hp but not so much torque. Kinda unique though.

KissMySSo1

iTrader: (2)

The blower just seems to be a restriction (pressure drop) like an IC would have. It probably sees 44 psi between the turbos and blower.Then the 26psi is seen after the blower. The blower is just slowing things down and heating everything up.

JBrady

Slowhawk, did you ever test the Cobra?

This concept is NOT the most efficient way to make peak power but will make an insane street experience.

The turbos make 26psi of boost after the air/air intercooler. The eaton takes this 26psi and increases it to 44psi after its air/water intercooler. There is a pretty decent tech story here http://www.musclemustangfastfords.co...bra/index.html

Now, you can definitely make this much power with turbos alone AND at a lower boost BUT you will not have the same type of response. It is hard to beat the nearly instant boost and linear throttle response of a positive displacement supercharger. This allows you to run large turbines for excellent exhaust flow, get the instant supercharger response AND go way higher than the SC alone power capacity. Sounds like serious fun to me.