. . . one serving of humble pie coming up.


In the May 03 issue of Muscle Mustangs and Fast Fords, there is an article on Jimmy LaRocca's install of a ProCharger centrifugal on an 03 Cobra. With an Eaton spun to 14 PSIG, a simple blower swap to a 14 PSIG ProCharger netted (drum roll, please):

580 rwHP. A 118 rwHP gain! And it was 160 better at 6,000 RPMs.

Bumping it up to 19 PSIG and running 100 octane, the engine made 647 HP at the wheels!

LaRocca: "This is the fastest street car that I have ever driven. It just plants you to the seat." And LaRocca's been in hundreds of very fast cars.

 

Apten had an '03 Cobra with a Procharger making just about the same amount...


Wonder what the cost would be to do a whole swap-out?

 

Just wait. A centrifugal powered Lightning is going to shock the Lightning world very soon. Did I say that? Oops!

 

Alright Sal, you slipped up in Public , I have been a good boy, not spill the beans.

 

The stock ProCharger F150 system will bolt up just fine (and you can delete the ATI intercooler). The problem is fabbing the intake. So, with the custom work, it would likely cost $4-5K.

 

easterisland? RDY2RAC?



I know the both of those guys are working/finishing up their installs... can't wait to see some times this year!

 

Ours is so close to being finished it isn't even funny. I'm waiting to hear if it is going to be finished before we leave for Georgia tomorrow morning (Robert is going to make a call today to get the final decision).

 

I've done several centrifugals and am very impressed with them. On a 14 psi 406 Chevy I did we made 700 rwhp; this was on 91 octane, NO INTERCOOLER!

Ton of potential there, just need a smog legal kit.

Jody

 

I sure hope it is. I'd like nothing better than to hear you or Rob post that 11sec or better timeslip.

 

just the paxton novi 2000 race blower costing $2500 by itself. i think the idea of a kit is awesome. but you need atleast a f series blower to even make the procharger worth while.

i'm not looking to go out first thing and run at full potential. were still on the stock block. we are shooting for 600 rwhp on the stock block.

my truck is scheduled to be on the dyno tomorrow afternoon but we are suppose to leave tomorrow morning for georgia.

 

Thats going to be a fun as truck!!!!

I love the sound of a novi 2000!!!!

 

Why would you say that? The standard P-1SC will support 850 HP. You planning on making more than that?

 

So why would 14psi from a cent make 118 rwHP more than a roots or screw at 14psi? When you say 14psi vs 14psi do you mean equal peak airflow?

I realize the cent will gain from not using the motor to spin, but wont it have a warmer air charge? Since the cent developes torque high in power band and roots/ screw does so at low rpm how will that effect moving our heavy trucks? I just dont think comparing 14psi vs 14psi of boost as being very revealing. Seems Easter has both blowers strenghts covered

 

yes by next year.

 

The same old myths . . .

The 14 PSIG on both blowers was peak boost. So how does a centrifugal makes so much more power? 1. It is more thermally efficient, meaning that it provides a more dense itake charge per PSIG. The air from a cent is WAY cooler at any given boost. 2. A cent takes far less drive horsepower.

"Not very revealing?" WTF? The comparison is not only valid, but actually favors the roots. If you can run 14 PSIG with a roots, you can run several more PSIG with an equivalent centrifugal due to the cooler output. If the comparison were done average boost-to-average boost, it would have been an even bigger rout.

A roots boost curve goes up quickly, then flattens out, then tapers off at the high RPMS. A centrifugal boost curve is more or less linear, increasing in a relatively direct relationship with RPMs. That is because a roots blower is just that -- a blower, not a compressor. A roots moves a fixed amount of air into the engine with each RPM. A centrifugal (and twin screw) is a true compressor.

The weight of the vehicle is all but irrelevant. Horsepower is horsepower. And the 03 Cobra is only about 1,000 lbs lighter than a Lightning. Add 1,000 lbs to the Cobra and the ATI will still smoke the roots -- in exactly the same proportion as with the stock weight.

People seem to lose perspective of the SCALE of the increase provided by a centrifugal. By mid RPMs, the ATI 03 Cobra system is already WELL ahead of the roots blower, and then keeps stretching the lead as the RPMs rise. Just how often are you below the point where the roots has an advantage? Once -- at launch in first gear. Further, why would you want all that power just off idle? To spin the tires harder? While the heavy vehicle business is a myth, the light rear weight of our trucks is a reality that heavily favors a more gradual application of power (at least for drag racing).

Look -- for raw power, the battle is over. The war has been won. Victory has been declared. Stick a fork in the Eaton. ATI's 03 Cobra system conclusively proves that. Replace a 14 PSIG Eaton on a Lightning with a 14 PSIG centrifugal and you will both make more power and go faster. This is no longer subject to debate. And with a centrifugal, you have just begun to start making power, while the Eaton is done.