Harrop twin screw sc for s65

[Patrón]

Originally Posted by 81bear

I can tell you I have trouble getting on the gas hard in 2nd, 3rd, and to a lesser extent 4th gear above 4500-5000 rpm so I can't image how difficult it would be with this harrop kit.

I am very familiar with the TVS kits as my old car (B8 S4) had one and it made great power down low and felt very linear with a tune that kept the bypass valve closed. It was an extremely fun car to drive around the street! It also showed well at the drag strip, knocking out a 11.7 @ 119mph, on race gas.

With that said however, I would figure it would get frustrating having so much torque down low and not having awd to get the power down... I find it frustrating modulating the throttle above 4500-5000 rpm to avoid going sideways I can only image how annoying it would be at 2500 rpm!

To me, the Harrop kit seems to better resemble the power band of the F80 M3/M4 and I've seen them struggle with traction issues, hopping curbs and such...

Originally Posted by regular guy

The heartbreaker is by brand, not necessarily by model within the brand. Nobody should compare across brands, but comparing against correctly run dyno's within the same brand, even on different days and different weather conditions should be OK. Although there are ways to manipulate dyno's and intentionally depress a baseline just so you can make the finished results (the delta) look bigger. How many people you see talking about "the delta" too?

That's a general rule, but not always the case. On load bearing dyno's like Dynapack, the ramp rate and gear ratio plays a role. So you will see a lot of variance on Dynapack because people don't all follow the same procedure. Much, MUCH less so on a Dynojet.

Early in the S65 supercharger days, one vendor tried to explain his lackluster results by saying the Dynojet in his neighborhood "read" 80whp low compared to the Dynojet at Specialty-Z a few blocks away. So I took my 600whp car to both dyno's on the same day and the results were within 5whp of each other. You don't even want to know the shit storm that created. I suspect some people still aren't over that because I see some of them still going out of their way to attack everything I post. (Can't wait to see if they respond to this...then you'll know who they are. :-) )

damn, i bet that was a tough one to explain...

[AYF80]

So whats the final verdict? HP/TQ at 93 and 100 oct with high boost kit?

[Limey]

Originally Posted by 81bear

I can tell you I have trouble getting on the gas hard in 2nd, 3rd, and to a lesser extent 4th gear above 4500-5000 rpm so I can't image how difficult it would be with this harrop kit.

I am very familiar with the TVS kits as my old car (B8 S4) had one and it made great power down low and felt very linear with a tune that kept the bypass valve closed. It was an extremely fun car to drive around the street! It also showed well at the drag strip, knocking out a 11.7 @ 119mph, on race gas.

With that said however, I would figure it would get frustrating having so much torque down low and not having awd to get the power down... I find it frustrating modulating the throttle above 4500-5000 rpm to avoid going sideways I can only image how annoying it would be at 2500 rpm!

To me, the Harrop kit seems to better resemble the power band of the F80 M3/M4 and I've seen them struggle with traction issues, hopping curbs and such...

I have a ton of grip w/ my 295 Advan R's. Especially in comfort mode. It's really not a problem.

[Joe S]

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 have just installed the Harrop SC and honestly the whine does not drown out the V8 sound just adds to that already beautiful sound !

[Joe S]

Originally Posted by aussiem3

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

Worth every cent ! :

[Joe S]

I'm very happy with this Dyno result
385kw at the wheel (516 HP) and 525 torque

[81bear]

Originally Posted by Joe S

I'm very happy with this Dyno result
385kw at the wheel (516 HP) and 525 torque

Crazy TQ numbers! At 3000 rpm you're making over 450wtq! I don't know how you keep from roasting the tires...

[81bear]

Originally Posted by Limey

I have a ton of grip w/ my 295 Advan R's. Especially in comfort mode. It's really not a problem.

Sweet! that will most likely be my next tire... or maybe RE-11's in a 305...

[Joe S]

Originally Posted by 81bear

Crazy TQ numbers! At 3000 rpm you're making over 450wtq! I don't know how you keep from roasting the tires...

It's worth the smile on my face !

[regular guy]

Originally Posted by 81bear

Crazy TQ numbers! At 3000 rpm you're making over 450wtq! I don't know how you keep from roasting the tires...

450 Nm = 332 Ft-Lbs
525 Nm = 387 Ft-Lbs

[81bear]

Originally Posted by regular guy

450 Nm = 332 Ft-Lbs
525 Nm = 387 Ft-Lbs

Ah... That makes a LOT more sense...

[Grk_M3]

Im busy re-building my motor, and considering going the stroker route. Can this kit work on the 4.4l stroker motor out there? Would we need BPM to play around with the tune?

[Joe S]

Originally Posted by 81bear

Ah... That makes a LOT more sense...

Yeah sorry 81bear! We have the metric system in Australia so torque is in Nm

[Disturbed]

Originally Posted by 81bear

Sweet! that will most likely be my next tire... or maybe RE-11's in a 305...

If you don't see rain, look into a Toyo R888. Also for a street tire the Nitto Invo shouldn't be overlooked.

I was hooking 610rwtq with no problem on a RWD car. That was rated on a Mustang Dyno too. It was all motor so it would hit hard. I could break loose 345 MPSS's at 60mph rolling. But the R888's would dead hook.

[Sered]

Originally Posted by Disturbed

If you don't see rain, look into a Toyo R888. Also for a street tire the Nitto Invo shouldn't be overlooked.

I was hooking 610rwtq with no problem on a RWD car. That was rated on a Mustang Dyno too. It was all motor so it would hit hard. I could break loose 345 MPSS's at 60mph rolling. But the R888's would dead hook.

If you see rain, the new BFG Rival S is even better.

[Disturbed]

Originally Posted by Sered

If you see rain, the new BFG Rival S is even better.

Haven't tried them. Do they come in 305/xx/19 and 355/xx/20 ???

[81bear]

Originally Posted by Disturbed

If you don't see rain, look into a Toyo R888. Also for a street tire the Nitto Invo shouldn't be overlooked.

I was hooking 610rwtq with no problem on a RWD car. That was rated on a Mustang Dyno too. It was all motor so it would hit hard. I could break loose 345 MPSS's at 60mph rolling. But the R888's would dead hook.

Good to know! I've wanted to go with the R888's but was concerned about their longevity. I get rain but more so concerned how they perform in cooler temperatures say high 30's low 40's?

[Disturbed]

Originally Posted by 81bear

Good to know! I've wanted to go with the R888's but was concerned about their longevity. I get rain but more so concerned how they perform in cooler temperatures say high 30's low 40's?

Need to be careful in those temps before they get warm. They tend to be hockey pucs.

[Pro-AM3]

Anyone else have this ket yet? We have the major players comfortably in the 10's 1/4 mile as well as plenty of roll racing action, 60-130's, and dyno's to accompany them.

Would be nice to know how this kit is performing on the road since its the only PD available.

[m3aviator]

Originally Posted by BossManE90

Anyone else have this ket yet? We have the major players comfortably in the 10's 1/4 mile as well as plenty of roll racing action, 60-130's, and dyno's to accompany them.

Would be nice to know how this kit is performing on the road since its the only PD available.

The harrop kit is not selling because the powers that be think they are selling gold. Ess is killing them on pricing. Until the price comes down I doubt you will see many early adopters.

[ilikebmxbikes]

Originally Posted by m3aviator

The harrop kit is not selling because the powers that be think they are selling gold. Ess is killing them on pricing. Until the price comes down I doubt you will see many early adopters.

The harrop also came late in the game. Our platform is a lot older than when the other supercharger companies released their units. A lot of e9x guys are now second and third owners of their cars. Many of the guys who would be buying the more expensive units have gone to new platforms. There are more harrop superchargers out there than you think and I would be curious to how sales have changed on all supercharger brands.

[LangRacingDevelopment]

Unfortunately we haven't had any stock S65's on the dyno but here's a comparison of a Harrop S65 vs a well performing S54 with AEM Infinity, cams, airbox, headers.



Obviously my dyno reads lower than a dynojet.