Hey All,

Does anyone know what sort of horsepower/kilowatts the Harrop supercharger is capable of making say with a bigger pulley and a fully built engine. Also is there much supercharger whine? cheers

I think you mean a smaller pulley.

Probably similar to the Edelbrock since I believe they use the same 1320 TVS blower. TJ Hunt just put down 420whp with E85 on an Edelbrock kit with a smaller pulley and a Delicious tune.

Yeah smaller pulley ahah woops didnt even realize. Looks like I'll be going with this supercharger. just wanted something that doesnt have a loud wine cause i want it to be some what stealthy. Thanks :thumbup:

No loud whine. You do get a little whirring sound under boost but no twin-screw whistle. There is a little more noise at idle, mostly just the sound of the gears linking the two halves of the roots blower. The gears are at the back of the unit so they're right behind the dash.
-Matt

Sent from my XT1095 using Tapatalk

On E85 it'll be similar to the Edlebrock and the harrop built car made aobtu 380WHP on e85, but on pump fuel the jury is out as it depends on how high IATs climb. An edlebrock car recently posted only 20whp more doubling the boost from 10psi to 20psi which was down to the higher IATs according to delicious. Though that was on a dyno, not when the car has been lapping a circuit so could be better due to increased airflow (you'll be going faster with more power).

From what I have seen the harrop is a tad better than the edlebrock in terms of IATs.

15 psi to 20 psi.

William at delicious said 20whp over the standard pulley which is 10psi/0.7Bar?

What's the minimum pulley size that's safe for 91 AKI at altitude (~4k)?

I'm from flat land, but am about to take a cross country trip.

Ok Guys...

Minimumn Pulley Size is 65mm - Requiring E85 to avoid Knock. should see 17-18PSI

Our car is running the 2.1l HKS Stroker Kit, and the 65mm Pulley, Plus some new enhancements making 315KW At The Hubs. Thats 422HP, and then to convert that to Engine HP, which you americans love.... factoring in a rough guess at 20% Drive Train loss thats 506HP at the Engine.

Hows that sound????

We run this on our Track Car, with no Issues with IAT, Please see the below chart with our track data from our MOTEC.

http://bit.ly/23aa1gY

I'd discuss this with your dyno tuner in person.

Hi Mate,

Come down and have a chat? happy to show you around and work it out with us.

@HarropOz - So what power does the harrop setup with the stroker kit and the 65mm pulley make on Ron99 rather than E85? You mention require E85 to avoid knock, but surely you can back off timing?

E85 is scarce here in the UK....

You need a pulley that produce around 11-12 PSI for european fuel. (Info from Delicious). It's more efficient that backing off timing.

If you want to run a high boost pulley you should really build your engine with a lower compression ratio. High CR builds are fine for turbo cars that run E85 since you can easily back off the boost when running the car on 91-93 fuel and run high boost on E85 making big power. With superchargers you can't change the boost on the fly so if you're not going to be running E85 all the time you have to pull a ton of timing to avoid detonation.... and if you pull too much timing your EGTs will skyrocket causing other problems. A lower CR engine should allow you to run the higher boost pressures on regular pump gas but also extract some extra power with more advanced timing when on higher ethanol content (Assuming a flex-fuel setup).

As an aside... I would really like to see some manufacturer incorporate a little CVT pulley on a supercharger kit for our cars. This would be the ultimate SC kit, in my mind. The ratio between the engine RPM and the SC RPM could be varied infinitely in real time to achieve whatever boost level you want (within reason, of course). Want to hold 10PSI from 2000 RPM to redline? Just adjust the CVT as revs change to maintain that pressure. Want to increase boost when running E85? No problem. This technology is just hitting the market http://www.fallbrooktech.com/accesso...s/supercharger
That company developed a clever CVT design for bicycles several years ago and has recently beefed up the design for use with superchargers.