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11-14-2018, 11:37 PM | #551 |
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How often you racing ? I have never. Not once. So its actually perfect. I daily my car, so I don't want to be revving to 4k rpm all the time to have usable torque. I want it early.
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11-15-2018, 01:35 AM | #552 |
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Anyone have this Harrop Supercharger in their M3 and has raced an F82 with tune? What was the result? Just curious. While I love the V8 and high revving, it definitely lacks torque. This Supercharger sounds like something I'd be interested in.
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11-15-2018, 06:15 AM | #553 |
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It depends on how aggresive the tune is, but you will take all but the most aggressive. Of course the sound from the s65 with a harrop is the real win.
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11-15-2018, 08:13 AM | #554 |
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this is why AA and Evolve are the best setups. the rotrex outperforms the vortec by 1-2 psi in the lowend and equal power up top. harrop has better low end but abysmal power up top
harrops gains in feel and performance all around can be achieved with a simple gear swap, bolt-ons and gintani tune.. for about $10k less |
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11-15-2018, 10:47 AM | #555 | ||
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Finally, as for the (assuming) Ferarri 458 vs a Corvette Zr1-C7 - dude...seriously? Apples to zebras. The Ferarri is a 3 year old N/A V12 vs a 2019 big bore LT5 motor with a monster supercharger that most are considering a supercar. But let's assume you're talking an older 2009-2013 model Zr1 -C6 - had the LS9 in those and still had a supercharger. Still apples to zebras. Look, both kits are great (centri vs posi), I just prefer a better street performing setup then a straight up drag setup that I have to wind the car out to 8.5K to really get max potential is all. |
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11-15-2018, 12:07 PM | #556 |
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I would compare VT650 to Harrop since the price is the same. The VT650 makes more horsepower and the same or more torque but the torque bump starts at higher rpm. Maybe one day a stage II Harrop will be released that bridges the gap, but that has not happened yet despite years of talk. The later boost of the centrifugal actually suits the available octane better given the high compression motor.
The VT650 will spank the Harrop in a drag race. The Harrop should spank the VT650 in lazy daily driving. |
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11-15-2018, 12:55 PM | #557 |
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[QUOTE=DukeofAlexandria;23994458]Look, both kits are great (centri vs posi), I just prefer a better street performing setup then a straight up drag setup that I have to wind the car out to 8.5K to really get max potential is all.[/QUOTE/]
This is gold.you might want to relook at them dynos lol. Peak power happens at 82-8500 for the Harrop kits lol. You bought the wrong car I’d don’t want to rev the car out lol. I mean think about what you just said. After the first shift you are back at 7k rpm you telling me you are going to start shitting at 6500 lol come on now. Even on a road course you don’t use the low rpm he’ll even in the tight hair pin I didn’t see lower then 5k on pima county in az. This is like someone driving a civic complaining about reving the car out. You maybe should have bought a f80 if reving a car out that’s meant to be used the way bother you. I meant c6 z06 I was posting about a zr1 earlier the tq far our paces that of a 458 because they are not designed to use power the same way. Hence the point of our m3. A c6z06 makes more tq than a458 by nearly 100ftq. It’s. It meant to make tq so yes I made the comparisons. It in fact makes the same tq na as a v12 f12 whichbis a 7.3 v12. That pretty sad that a v8 with same size litter and 4 less cylinders makes the same tq. None of those cars make great tq by ratio. But again they are not meant too. They are made to be rev’d out. But to each their own. The comment about not wanting to rev a car is just pretty funny lol. |
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11-15-2018, 02:34 PM | #558 | |
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[QUOTE=Properstyle;23995116]
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I wasn't sure of what you meant, since I had to decipher your messages - and now you're changing your argument from a Corvette C6-Zr1 to a C6-Z06. One is supercharged, the other is not, I can't follow these stories anymore, I'm done lol. |
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11-15-2018, 02:44 PM | #559 |
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There is a dyno comparison already posted of the Harrop vs a VT650. I’d buy the VT650 if I had $10k to spend on a supercharger (actually it’s $9500). So that is the only comparison that makes sense to me. Plus it’s the centrifugal kit that is closer in torque to the positive displacement kit, so it’s more apples to apples.
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11-15-2018, 03:12 PM | #560 | |
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[QUOTE=DukeofAlexandria;23995678]
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A c6z06 makes the same tq as f12 7.3 Ferrari. When you put a positive displacement blower on a motor like that or even the 6.2 they make instant high tq and hold it to redline. Some making more tq than hp. A m3 is not made to do this. So it’s always mind boggling when people try to force something that’s not meant to be so my comment was you spend money to be slower for some feeling that you have tq where your car is never at to use it. |
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11-15-2018, 03:42 PM | #561 | |
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11-15-2018, 04:24 PM | #562 |
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Peak torque is irrelevant. Its torque delivery and the point at which it is available. Thats the whole point of positive displacement. No one buys a harrop to have the fastest top end M3.
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11-15-2018, 06:10 PM | #563 |
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m3s in general make flat tq curves so tq really doesn’t change by much through out the band. See graph below at 3500 it’s Bohr 325 and after that stays at 390-400 until redline. That’s under the curve power.
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11-15-2018, 08:21 PM | #564 |
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flat torque curve ? Maybe after 3k rpm it is flat, the number one complaint you hear is how little torque there is down low. Thats what a harrop deals with. Dyno's dont even bother looking at that because its all about trying to get big numbers at the top. If you dont understand this there is no point trying to explain it to you, but everyone who has driven a Harrop will tell you exactly the same thing, they are the most driveable e9x M3 available. Its the 1k to 3k range where they make the difference.
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11-18-2018, 07:02 AM | #565 |
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Id say lets race, 0-150mph, 40-80, 60-130; identical cars. 1 harrop+exhaust, the other FBO+gear change.
Id wager REAL $ the FBO car walks away from it the entire time, for several thousand dollars less Last edited by Pro-AM3; 11-18-2018 at 07:12 AM.. |
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11-18-2018, 07:22 AM | #566 | |
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Remember that time 2 similar cars were tested, and it was shown that the Rotrex s/c cars made more power, earlier than the vortec, at the same boost level ( 7.5psi/625 kits), and the forums ignored it because it cracked the vortec superiority myth? Pepperidge farms remembers http://i114.photobucket.com/albums/n...psiaqz50a7.jpg http://i114.photobucket.com/albums/n...psiaqz50a7.jpg http://i114.photobucket.com/albums/n...psiaqz50a7.jpg http://i114.photobucket.com/albums/n...psiaqz50a7.jpg http://i114.photobucket.com/albums/n...psiaqz50a7.jpg http://i114.photobucket.com/albums/n...psiaqz50a7.jpg http://i114.photobucket.com/albums/n...psiaqz50a7.jpg |
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11-18-2018, 09:51 PM | #567 |
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Keep carrying on about power and racing mate, while the rest of us here enjoy our driveability.
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11-19-2018, 04:30 AM | #568 |
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We get it Pro am, you dont like Harrop SCs. But I doubt you can get 100 hp out of full bolt ons. Here is what I have seen on past threads.
Air box- + 5-7 Tune + 15-20 exhaust +15-20 pully- +10-12 Gear Change ?? Net HP gains for FBO= 45-59
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Harrop Supercharger, BPM Tune, K/W Coil over kit, Stoptek BBK, Magnaflow exhaust, ear to ear grin everytime I drive... Last edited by Mvy; 11-19-2018 at 04:38 AM.. |
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11-19-2018, 06:12 AM | #569 |
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The Harrop car will beat the FBO car, but lose to a car with a centrifugal kit that costs the same as the Harrop kit. Like people have said, in daily driving the positive displacement blower produces more torque sooner — it’s all in before the centrifugal has even started making boost. Be great with AWD for better traction. The best recipe for power with a small V8 in the 4L range, though, is twin turbo, which is why BMW, Audi and Porsche are making them.
I’d still take the VT650 kit over the Harrop for an E9xM3. But when I buy another used performance sedan it will be twin turbo V8 with AWD. |
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11-19-2018, 09:56 AM | #570 | |
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11-19-2018, 10:53 AM | #571 |
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AA did post one good dyno of a planetary gear drive blower hitting 600 rwhp SAE Dynojet a few years ago. As I recall the boost was higher than what ESS uses on the VT650. I do think those style centrufugalscan iffer a slight low to midrange power advantage over a fixed step up Vortech. They are certainly not like positive displacement blowers, though, in terms of low to midrange power.
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11-22-2018, 12:31 AM | #572 |
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There are a whole lot of posts that we need to reply to clarify fact vs fiction. But in the spirit of Black Friday - thought we'd post here that we're going to offer 10% off of kits for those interested. PM for the deal.
Should have some time to reply by this weekend. Happy holidays everyone.
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