Bondobird

That's good! What kind of power are you making? Any time slips?

Razor

608/672 Mustang dyno, unlocked converter, 4L80E, 9 Inch.

Bondobird

Those are pretty damn good numbers! Must be a blast to drive around!

427

iTrader: (3)

Does the 4.5 use the same intercooler core as the 4.0?

Kurt

Bondobird

Yes it does

427

iTrader: (3)

Are all the fitting connections the same?
Will the 4.5 sit in the same space as far as the front drive, just longer runners out the backside?
What do you think the 4.0 and 4.5 will support flywheel HP?
Sorry about the questions, Whipple info is tough to come by!

Kurt

Bondobird

To my knowage, the 4.5 uses the exact same core, fittings and all. It's supposed to support 1500hp. I will double check and let you know.

Bondobird

Here's what Dustin Whipple told me
"It all depends on the application such as octane, type of fuel, street or strip, auto or marine. The 4.0 has made 1425hp on some heavily modified motor while the 4.5 has already made 1650hp and climbing on some heavily modded motors"

427

iTrader: (3)

Can the 4.5 bolt on and work where the 4.0 is now? Does it share the same drive spacing as the 4.0? I assume it's got longer rotors for the added capacity, so the TB mounting area moves back??

Kurt

Bondobird

The 4.5 is only longer by a couple of millimeters. It's taller and wider. Not by much though. I want to say yes, you can get the 4.5 to sit in the same place to use the same belt line. I will double check today. The 4.5 does have it's own discharge plate and big/heavy duty drive. So if you swapped, it would use a different discharge plate (same intercooler though), supercharger pulley, tensioner plate and drive collar. You will also need to modify or replace your supercharger inlet. I will get you some detailed pics today of a next to each other with drives. You're using a 4.0 sand rail kit, right? Which heads?

427

iTrader: (3)

I bought the 4.0 direct drive, then made my own front belt drive. The LS drives that Whipple offered spaced the belt for the blower in front of the accy drive, I was afraid of that crank load in a road race car. My drive is as far back as the supercharger allowed, this also helps with hood clearance in cars.
So the added .5 litre is done with larger rotor diameter change, that should be good for packaging. My next dream turn key package is 1500hp, I was assuming I would need turbocharger or cent supercharger, they both are difficult for packaging control.

Kurt

Bondobird

Same length and the only thing that makes the 4.5 taller is the castes Whipple logo. Quite a bit wider because of the bigger diameter rotors.
Dustin says that there would only be about .020 difference in pulley spacing if you went with a 4.5 with a direct drive. So it should work just fine with your belt line

chuntington101

Is the 4.5 a true 4.5ltr per rev? The 4.0 was only actually 3.85 ltr per rev (I think).

427

iTrader: (3)

That looks promising. If my 4.0 testing goes well I might need one of these!


Kurt

Bondobird

To my knowlage, yes it is a true 4.5. Well it puts out 275ci per revolution which calculates to 4.583 liters. Then again, the 245ci(4.0l) calculates to 4.083liters. Where did you hear that the 4.0 only puts out 3.85 liters?

chuntington101

Oh, I can't remember where I heard it. But thought it was true. Clearly it's was rubbish.

chuntington101

Kurt, is it not worth going with the 4.5 anyway? Lower rpm should help maintain lower IATs which will put less stress on the cooling system.

427

iTrader: (3)

If the 4.0 meets my goals I will stick with it. I will not be pushing the 4.0 beyond it's ability by the information given, but I will be recording a bunch of temps. My biggest concern still is the intercooler and the 4.5 uses the same one. As delivered the intercooler could not meet my goals because of the fittings it uses based on things I have seen over the years. My modifications might work for higher power, but I won't know until I run the test. If all goes well I may try the 4.5 on my 1500hp crate for a turn key package.


Kurt

Bondobird

Kurt, when did you purchase your kit? I've only been back to Whipple for about a year(I was gone for a few years) and to my understanding, we have a new guy making out intercooler cores. I wonder if you have an older one. I'll talk to the guys on Monday to find out when we switched.

Rise of the Phoenix

iTrader: (27)

I'm looking forward to seeing the end product; both HP/TQ and ET's. I've always thought a Whipple supercharger on these LS engines would be very nice. Hopefully we will see more of these builds in the future. Good luck with everything OP.