Harrop twin screw sc for s65

[DaveDee]

Originally Posted by Mike Benvo

I wasn't able to discuss my involvement at that point until the partnership was finalized

I've thoroughly enjoyed working with Harrop on the software development of this kit, and couldn't imagine my car without this OEM grade fine piece of machinery...

The torque is just sublime.

And it looks good too......

[roastbeef]

can this please apply for CARB certification?

[Dalthar]

Maybe a silly question but does the whine of this kit drown out the V8 noise from inside the cabin? I'm pretty interested in getting this kit at some stage but I still want my car to sound like a V8 when I'm driving.

Some vids I've seen the whine seems very loud all the time while others it only seems to mostly whine when taking the foot off the accelerator.

[ashtaron14]

Originally Posted by Dalthar

Maybe a silly question but does the whine of this kit drown out the V8 noise from inside the cabin? I'm pretty interested in getting this kit at some stage but I still want my car to sound like a V8 when I'm driving.

Some vids I've seen the whine seems very loud all the time while others it only seems to mostly whine when taking the foot off the accelerator.

I think the higher pitch of the whine does cover the deeper tone of the V8, but you can still hear the throttle body butterflies at WOT.

There is just no other car that sounds like this on the road.

[Pro-AM3]

has anyone gotten real performance #s from one of these yet? 1/4 mile or 60-130?

Dynos are dynos, and 500hp is 500hp, but how do they perform on the road? Ho much faster do the cars accelerate, not in a road course because thats driver dependent. How much faster is the CAR with this powerband?

[BobS]

Any harrop cars at Shift sector or any event? Would be nice to see a head to head acceleration comparison with a similiar HP kit.

[ashtaron14]

My car is in
http://www.speedhunters.com/2015/04/...charged-rides/

[DaveDee]

Originally Posted by BossManE90

has anyone gotten real performance #s from one of these yet? 1/4 mile or 60-130?

Dynos are dynos, and 500hp is 500hp, but how do they perform on the road? Ho much faster do the cars accelerate, not in a road course because thats driver dependent. How much faster is the CAR with this powerband?

Here you go, one of my customers here in Australia a couple of weeks after fitting the Harrop SC kit. Other than catback exhaust/20" rims the car is bone stock
11.2... not too shabby

[Sered]

Did he let off early on the back end? An 11.2 at 121 with a ~1.8 60' doesn't sound right. I think a 125-126mph trap would make more sense or a ~1.6 60' which I don't see a M3 on 20" rims doing anytime soon.

EDIT: Looking more into it, he was probably going into 5th gear right as he crossed the traps, hurting his mph.

[Pro-AM3]

Originally Posted by DaveDee

Here you go, one of my customers here in Australia a couple of weeks after fitting the Harrop SC kit. Other than catback exhaust/20" rims the car is bone stock
11.2... not too shabby

Damn. Thats slower than an ESS 550 by a few MPH and way slower than the 6XX kits. Thanks.

[MilehighM3]

Originally Posted by BossManE90

Damn. Thats slower than an ESS 550 by a few MPH and way slower than the 6XX kits. Thanks.

Having a stock x pipe and 20" wheels doesn't help at all either

[Sered]

Originally Posted by BossManE90

Damn. Thats slower than an ESS 550 by a few MPH and way slower than the 6XX kits. Thanks.

Really? How many of those kits ran an 11.2 on 20" wheels and what looks like only minimal track prep. His 60' and ET don't make complete sense with the trap, so either he was shifting in the traps or he let off early. Both of which are possible and happen often.

And ess 550 cars don't trap a few mph higher than that. They generally trap about that.

[regular guy]

Originally Posted by Sered

Really? How many of those kits ran an 11.2 on 20" wheels and what looks like only minimal track prep. His 60' and ET don't make complete sense with the trap, so either he was shifting in the traps or he let off early. Both of which are possible and happen often.

Or, there's not much top end power to carry that higher trap speed. I received some dyno files for the Harrop today. If I get some time, maybe I'll model it in CarTest to see what it predicts for the 1/4 mile time.

And ess 550 cars don't trap a few mph higher than that. They generally trap about that.

The ones I've datalogged were about 121 - 123 mph, maybe just shy of 124 on a good run. For the most part, I'd agree with you because the 123's and 124's are with very experienced drivers. So let's assume this is an average driver, and these are average results that would put it right on part with the average 550 owner as well.

[Pro-AM3]

Originally Posted by Sered

Really? How many of those kits ran an 11.2 on 20" wheels and what looks like only minimal track prep. His 60' and ET don't make complete sense with the trap, so either he was shifting in the traps or he let off early. Both of which are possible and happen often.

And ess 550 cars don't trap a few mph higher than that. They generally trap about that.

They do if you look at the HP the kits make, roughly 500 at best, same as the Stage 1 Centrifugal kits, only the centris are trapping higher due to better efficiency.

All that low down TQ advantage was negated by the high rpm losses.

20's may have hurt in weight, but helped in traction. Look at that 60'. Every other kit that cuts a 1.7 was on drag radials for the track, 10 second 1/4 mile,+130mph+ traps, except for 1 car that was also deep 11's, but upper 12x's mph

I believe the 2 best ESS 535/550 kits dyno'd at 470RWHP and did 11.4@126mph and 11.3@123mph

[FFM]

It's not unlikely that he may have let off. Not sure about you guys, but here anything below a 11.49 requires a roll bar, in which he would have been red flagged.

[Sered]

Originally Posted by BossManE90

I believe the 2 best ESS 535/550 kits dyno'd at 470RWHP and did 11.4@126mph and 11.3@123mph

Maybe in a big negative DA. On normal days, 470whp in a M3 will get you maybe 121-122mph traps. The C6Z06 with a far wider powerband and far less weight (3100lbs and 440whp stock) traps around 125.

And it's plainly obvious the guy let off in the traps or had an artificially deflated trap due to the shifting into 5th.

[Pro-AM3]

Believe what you want.

I believe that the kit makes 500 HP on 100 octane on EAS Dynojet, and subject to higher heat trapping 121 is what to expect. This is of course MY opinion based off of results from every other known HP-1/4 mile correlation of E9x M3 over the past 5 years.

But if you believe he let off so as to NOT run faster, so be it. Ill sit idly by waiting for the cars with the kits to prove me wrong and get out there and do some performance tests. like BPM at sac or famosa or SS airstrip attack. or even the guy with that slip go and retest and make a "full" pass

FYI, none of the other M3s on the 1/4 mile list have cages, including the ones under 11.5 seconds

[FFM]

Originally Posted by BossManE90

FYI, none of the other M3s on the 1/4 mile list have cages, including the ones under 11.5 seconds

Must be nice. That's a pretty standard regulation.

[aussiem3]

Strapping a 'charger just gives you the bragging rights. Is it worth the money you spend?

[X5-User]

Originally Posted by aussiem3

Strapping a 'charger just gives you the bragging rights. Is it worth the money you spend?

NOPE

[BobS]

Originally Posted by aussiem3

Strapping a 'charger just gives you the bragging rights. Is it worth the money you spend?

It's definitely worth the money.... take one pass in a supercharged M3 and you'll be hooked. The question is....which charger is really worth your hard earned money

[Sered]

Originally Posted by BossManE90

But if you believe he let off so as to NOT run faster

That 5 years of experience didn't teach you much if you can't glance at a timeslip and see something is up. 1.8 60', 11.2 ET and 121mph traps. Normally a 1.8 60' will net you low 11s at mid 120mph. There's about 3-4mph missing there. I'd believe a 1.6 60', 11.2 ET and 121mph traps.

I know this from 15+ years of experience as a performance enthusiast and hanging around a lot of people who are into serious drag racing plus having a lot of my own cars on tracks of various sorts (along with engine builds and other things in my own garage). This is just basic 60' vs ET vs trap stuff.

Originally Posted by aussiem3

Strapping a 'charger just gives you the bragging rights. Is it worth the money you spend?

Owning an M3 is just bragging rights too. Is it worth the money you spend when I could go spend less than half as much and make a 335i blow your doors off?

See what I did there? It's worth the money if it makes you happy. Period. In the end this is a hobby for 99% of people out there. I have a favorite saying about hobbies: "Spending money on a hobby is an investment in your sanity."