I have a 383 with fully ported LT4 heads and am wondering if a P600b will support 600+ rwhp. Any info or other options would be great. Thanks

 

I called Ati and begged for a compresssor map for P600B. No dice.
Without a compressor map its hard to tell. I think it might be possible if you keep the pulleys moderate sized and rev the sucker to 7K.

 

Their literature says 1200cfm, which is the same as a Vortech S-trim. If this is true, it oughta do it.

Rich Krause

 

Thanks for the replies . I am looking forward to all the extra power!!!!!!

 

According to ATI the Max Supercharged HP is 775

 

I was told it was around 900 cfm with a pressure ratio of 1.7 at peak efficiencyby Ati.
I'm going to try something similar this years edition lt1. I picked up some 48 cc dish pistons that will put comp at 7.6 to 1 and I have 15 lb pulleys. I already have themal coated the intake ducting ,manifold heads and will have the slugs sprayed too. Got two fans for the intercooler and sent off for water injection.
I plan on going back to a stock cam and installing 1.6 exhaust valves. Spin it to 6200 if the cam lobe allows it. How hard have you guy twisted a stock cam? With the springs upgraded the blower will keep it pulling farther past its intended upper range the stock cam of 5800 to at least 6200 right? AFR rev kit is most likely in the plan.
Why a stock cam you ask? Throttle response, off idle torque, easier programming and a stock converter. I spend alot more time at 1500 then 6000. My software says i'll lose .15 sec compared to my accel 211. Big whip.
I didn't enjoy driving the car with a loose converter and a cam with more overlap. I't kind of felt either "on or off". I prefer a tighter low end for driving in traffic on the Interstate. It is also alot funner on the twisties with a more gradual power slope. The software say ill pick up 35-40 hp at 6200 but lose that much torque at 1500. i want torque. It estimates peak Hp at 6200 of 580 Hp with 16.5 lb boost. Funny thing, frictional hp loss at 6200 rpm was almost 300 hp!! another thing the exhaust valve size had a dramatic effect on the very top end. Almost 40 hp over a 1.5 exhaust. About the same as changing rocker ratio's,header primarys, and changing the whole exhaust. Alot more cost effective for me to go with the valves since one is bent and can't match it to a manufacturer.
Will i get 580 HP, no. I'm sure the tune will never be near perfect, the valves will float sligthly and the blower is going to be working past it's peak range. BSFC numbers will get horrid past 5500 and willl require another fuel system rework to keep up.
I will be happy to settle for 525hp. Will a P600B make 600hp at the rear wheels? Maybe with alot more work on the heads, cam, and the whole exhaust with a 6 spd and plenty of data logging and creeping the AF mixture as lean as you dare. It can be done im sure. Just not the best way to go about it.
If 600 rwhp is you goal from the onset you should step up a bit on the blower choice. If you have one now and don't make 700 crank hp don't feel too bad. Your probably not going to use it alway, unless you have spent the $4000 in chassis and drivetrain upgrades to allow you actually hook and not break your stuff regularly. If you have one already, build around its strengths or sell it and get a biggie. In my humble opinion, If its for competition, you wont be competitive with a 600b . If its for street it with blow plenty of air for getting sideways and giggling. For street and strip or a toy you could make an arguement either way.
A 383 with Lt4 heads will flow alot a air but remember you are going to be running down the back side of the efficiency curve faster compared to a non stroker with lesser heads and cam. You will "use up the blower faster" for lack of a better phrase.
What is you compression ratio now? I ran 10.4 with a 9 lb kit and 112 Cl cam with fair to good results. If you haven't dropped compression ratio already you might try a small nitrous shot instead. With a 383 LT4 you are already on the verge of street traction. It's a big expensive leap from a 450 hp mid 12's car and a 700HP mid 10" car

 

right now I am N/A with a 12.0 to 1 compression ratio. SRP makes a set of off the shelf 31cc dish pistons that I have been looking at for a while. I then want to pick up a used supercharger. The reason I ask about the P600b is because I see a lot of people selling them for a good price. Do you think I would be better off going with a vortech T trim or a D1?

 

The P600 is great for a stock engine or mild blower car... it will get you to the high 10's/low 11's but, I would probably go ahead and get the D1 if you haven't got a blower yet. If you spin the P600 as fast as it will go it would probably put out a maximum of 8 pounds of boost or so on your engine.

 

I have seen it make 650 rwhp in an M6. On my car at 8# with stock heads I am making 500 rwhp in an A4 so it can make 600 rwhp.

 

Anyone care to calculate what his impeller rpm will be at with his combo to make 600+ rwhp?

10:1 says that it is way over redline, you need to call places that are experienced with our cars and can calculate this for you to aid in getting the right blower for your app.

 

The 650 rwhp car I saw was only using the 15# pulley and not reving real high so I doubt it was above redline on the blower.

RPMs of the blower doesn't directly correlate to hp either.

 

wow kevin..that was a long long helpful post!
thanks..kinda confusing if your new..but still thanks

 

If thats the case why would anyone ever bother buying a larger blower than a p600 or strim? If you can make the big power, and not go above impeler red line no one would really spend more money on larger blowers...

 

You got me way confused then. The whole corelation i would think is rpm of the blower cause it is not a psi thing it is a volume of air thing. such as.... If ducks are volumes of air...

If you move 10 ducks into a fenced in area through a huge door or you move 10 ducks into a fenced in area through a crack its still 10 ducks....

The whole thing is your trying to get in x cubic feet of air so you can put more fuel into the motor. Psi is just measuring the restriction of air into the engine.

I might be wrong on this one just want to think of it right and get my ducks in a row

Steven

 

The amount of air it can move at a given RPM gives you the potential hp you can make(with 100% efficiency). RPMs by themselves don't mean anything. Obviously a larger blower will have higher potential but will also have higher parasitic losses.

I am not trying to justify one blower over another since that wasn't the post, he asked if you can make 600 rwhp with a 600B which you can and more thats all. Maximizing your setup with whatever blower you pick is of utmost importance. A bigger blower will do you no good with small heads and cam or vice versa.