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      06-28-2011, 11:35 PM   #1
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Talking ESS VT2 Update

While Iíve only had the kit installed for 4 months and about 6k miles, I feel compelled to provide an update for the benefit of anyone on the fence about getting a S/C. Do it. This kit continues to impress me every time I drive it, be it spirited or casual driving. Itís simply amazing how smoothly this car can put down roughly 600hp (although, to be fair, first gear can be described as nothing less than violent). I wouldnít say that Iíve become desensitized to the power, because it still scares me every time I open the throttle, but I will say I was less than impressed when I drove a new 2011 C2S with PDK recently. Itís no surprise that it doesnít have anywhere near the thrust of an ESS M3, but I looked at it more as what my M3 felt like pre-S/C. I suppose you could say that I was just surprised by how big the difference was. The C2S felt like it had a hamster wheel for a motor in comparison. I also hated the PDK in comparison to DCT.

Most importantly though, Iím amazed at the reliability of this kit. Iíve done 4 track days in the past 8 weeks (with at least 4 more on the docket for rest of the year), and I havenít experienced the slightest hiccup or indication that Iím pushing the car too much. And Iíve really beaten on it hard. Most recently, I was at Autobahn CC on June 6 in 90+ degree heat (95 for most of the day and peaked at 97 degrees Ė a complete anomaly for this time of year). The oil temp held steady at the hash mark halfway between 210 and 300 and the water temp barely moved from 220 degrees all day (200 is where it usually hovers in normal driving). This is the most important part of the kit for me Ė I donít ever want to have to take it easy on the car or feel like itís compromised in any area. I donít know if the credit here goes to ESS for building a kit with an effective cooling system or to BMW M for the S65ís impressive ability to dissipate heat, but in either case Iím happier than a pig in shit. Iíve driven stock M5ís and M6ís on the track on cooler days and received the overheat warning light, so the fact that a smaller motor thatís aftermarket modified to produce a higher output is more effective at keeping cool becomes quite impressive.

I hope that anyone considering the ESS waits no longer. That is my only regret with this kit Ė should have done it sooner.
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      06-28-2011, 11:43 PM   #2
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Great write-up!
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      06-29-2011, 12:04 AM   #3
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Agreed, it is an amazing kit.
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      06-29-2011, 12:13 AM   #4
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Quote:
Originally Posted by Brosef View Post
While Iíve only had the kit installed for 4 months and about 6k miles, I feel compelled to provide an update for the benefit of anyone on the fence about getting a S/C. Do it. This kit continues to impress me every time I drive it, be it spirited or casual driving. Itís simply amazing how smoothly this car can put down roughly 600hp (although, to be fair, first gear can be described as nothing less than violent). I wouldnít say that Iíve become desensitized to the power, because it still scares me every time I open the throttle, but I will say I was less than impressed when I drove a new 2011 C2S with PDK recently. Itís no surprise that it doesnít have anywhere near the thrust of an ESS M3, but I looked at it more as what my M3 felt like pre-S/C. I suppose you could say that I was just surprised by how big the difference was. The C2S felt like it had a hamster wheel for a motor in comparison. I also hated the PDK in comparison to DCT.

Most importantly though, Iím amazed at the reliability of this kit. Iíve done 4 track days in the past 8 weeks (with at least 4 more on the docket for rest of the year), and I havenít experienced the slightest hiccup or indication that Iím pushing the car too much. And Iíve really beaten on it hard. Most recently, I was at Autobahn CC on June 6 in 90+ degree heat (95 for most of the day and peaked at 97 degrees Ė a complete anomaly for this time of year). The oil temp held steady at the hash mark halfway between 210 and 300 and the water temp barely moved from 220 degrees all day (200 is where it usually hovers in normal driving). This is the most important part of the kit for me Ė I donít ever want to have to take it easy on the car or feel like itís compromised in any area. I donít know if the credit here goes to ESS for building a kit with an effective cooling system or to BMW M for the S65ís impressive ability to dissipate heat, but in either case Iím happier than a pig in shit. Iíve driven stock M5ís and M6ís on the track on cooler days and received the overheat warning light, so the fact that a smaller motor thatís aftermarket modified to produce a higher output is more effective at keeping cool becomes quite impressive.

I hope that anyone considering the ESS waits no longer. That is my only regret with this kit Ė should have done it sooner.
Glad you are enjoying the kit
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      06-29-2011, 01:16 AM   #5
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Nice review, glad you're still enjoying things.
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      06-29-2011, 11:05 PM   #6
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Another happy customer !
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      06-29-2011, 11:06 PM   #7
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So glad i never been in a car that has it.
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      06-29-2011, 11:53 PM   #8
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Quote:
Originally Posted by Crazy Bimmer View Post
So glad i never been in a car that has it.
You need to be....ASAP!
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      06-30-2011, 03:10 AM   #9
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Quote:
Originally Posted by Crazy Bimmer View Post
So glad i never been in a car that has it.
Once u feel/live the experience,you will feel the need of the boost in ur life,kida like Oxygen !!!
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      06-30-2011, 05:10 PM   #10
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I'm interested in the response of the engine on the track. Is it just as linear and progressive as the stock motor, but just with more thrust?

Just curious as you are feeding power in out of the corners if the motor's response feels any different or more difficult to modulate. You seem to indicate not.
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      07-01-2011, 10:11 AM   #11
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Quote:
Originally Posted by VictorH View Post
I'm interested in the response of the engine on the track. Is it just as linear and progressive as the stock motor, but just with more thrust?

Just curious as you are feeding power in out of the corners if the motor's response feels any different or more difficult to modulate. You seem to indicate not.
the power delivery is even smoother than stock - I haven't dyno'd my car, but if you look at the dynos that others have posted, you'll see that torque stays flat all the way to redline (unlike the stock motor which starts to run out of breath at the tail end). so I think your description is right on that it's linear like stock, but with more thrust.

having said that, with a 40% increase in power, you have to be more judicious with the throttle coming out of corners. it definitely takes some getting used to, but there's a lot more you can learn about throttle control when you have to feather it more gently.

it's amazing to me that this motor can retain all of the throttle responsiveness with a blower. I drove an N54 car the other day (I had a 335 a couple years ago too), and the delay between throttle input and power delivery feels like a seriously long time coming from the S65. it's such a tragedy that BMW is scrapping the S65 in the upcoming M3; it's truly a gem.
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      10-11-2011, 10:53 PM   #12
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Quote:
Originally Posted by Brosef View Post
it's amazing to me that this motor can retain all of the throttle responsiveness with a blower. I drove an N54 car the other day (I had a 335 a couple years ago too), and the delay between throttle input and power delivery feels like a seriously long time coming from the S65. it's such a tragedy that BMW is scrapping the S65 in the upcoming M3; it's truly a gem.
That's the beauty of superchargers: zero lag. As they're driven by the crank itself there's no need to wait until there's increased exhaust pressure to start getting some boost.

In this case you have the additional advantage of having a centrifugal blower, which conserves the S65's extremely linear power delivery and simply gives you more of the good stuff at all times.

The new turbo engine will be awesome in the way the new M5 is awesome. Yup, it'll be fast and efficient, but it will have lost the instant response and wonderful sound of the NA S65.

Your car is breathtaking and I also thought the acceleration was 'enough'. Once you can't open the throttle all the way running 295 in the rear you know you have enough LOL. No need to get any more HP for any reason.

Cheers
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      10-12-2011, 07:34 AM   #13
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Quote:
Originally Posted by SYT_Shadow View Post
That's the beauty of superchargers: zero lag. As they're driven by the crank itself there's no need to wait until there's increased exhaust pressure to start getting some boost.

In this case you have the additional advantage of having a centrifugal blower, which conserves the S65's extremely linear power delivery and simply gives you more of the good stuff at all times.
No, it gives you more of the good stuff only when engine rpm are sufficient for the centrifugal to produce positive pressure. A centrifugal supercharger produces peak boost only at peak rpm, and you are never there for long. The boost curve is actually exponential, with little boost produced in the first half of the engine rpm and more boost produced in the second half of the engine rom. Roughly, the centrifugal will produce the square root of peak boost at half peak engine rpm. In other words, the centrifugal that makes 7.5 psi at 8400 rpm makes 2.75 psi at 4200 rpm.

On the other hand, 2.75 psi does add significant power and on these high revving motors, you are often driving at 4000 rpm and up. And the metered boost of the centrifugal does match up well with the metered power of the low torque high rpm S65 to produce a gradual, straight line power delivery.

A nicely done turbo system will spank a centrifugal because it will produce full boost in the midrange rather than the square root of full boost. Since that is the engine's natural torque peak, torque is way higher with a turbo.

I first supercharged and then turbocharged my E36M3. Both systems were modded well past the typical stage 2 level. With the centrifugal, I made 16 psi peak boost at 7000 and about 4 psi at 3500 rpm, producing 463 rwhp and 368 lbs rwtq. With the turbo, I make 15 psi at 3100 rpm in 5th, 3300 rpm in 4th, 4000 rpm in 3rd, and wheelspin in 1st and 2nd before I hit 15 psi, and it makes around 500 rwhp and around 475 lbs rwtq.

With the turbo, I am not waiting around for the power to arrive like I used to wait with the centrifugal. The fun is not all in the top 1/3 of the rpm curve.
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      10-12-2011, 12:16 PM   #14
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Quote:
Originally Posted by Brosef View Post
While Iíve only had the kit installed for 4 months and about 6k miles, I feel compelled to provide an update for the benefit of anyone on the fence about getting a S/C. Do it. This kit continues to impress me every time I drive it, be it spirited or casual driving. Itís simply amazing how smoothly this car can put down roughly 600hp (although, to be fair, first gear can be described as nothing less than violent). I wouldnít say that Iíve become desensitized to the power, because it still scares me every time I open the throttle, but I will say I was less than impressed when I drove a new 2011 C2S with PDK recently. Itís no surprise that it doesnít have anywhere near the thrust of an ESS M3, but I looked at it more as what my M3 felt like pre-S/C. I suppose you could say that I was just surprised by how big the difference was. The C2S felt like it had a hamster wheel for a motor in comparison. I also hated the PDK in comparison to DCT.

Most importantly though, Iím amazed at the reliability of this kit. Iíve done 4 track days in the past 8 weeks (with at least 4 more on the docket for rest of the year), and I havenít experienced the slightest hiccup or indication that Iím pushing the car too much. And Iíve really beaten on it hard. Most recently, I was at Autobahn CC on June 6 in 90+ degree heat (95 for most of the day and peaked at 97 degrees Ė a complete anomaly for this time of year). The oil temp held steady at the hash mark halfway between 210 and 300 and the water temp barely moved from 220 degrees all day (200 is where it usually hovers in normal driving). This is the most important part of the kit for me Ė I donít ever want to have to take it easy on the car or feel like itís compromised in any area. I donít know if the credit here goes to ESS for building a kit with an effective cooling system or to BMW M for the S65ís impressive ability to dissipate heat, but in either case Iím happier than a pig in shit. Iíve driven stock M5ís and M6ís on the track on cooler days and received the overheat warning light, so the fact that a smaller motor thatís aftermarket modified to produce a higher output is more effective at keeping cool becomes quite impressive.

I hope that anyone considering the ESS waits no longer. That is my only regret with this kit Ė should have done it sooner.
Great write up thanks!

Planning to get myself a ESS SC soon.

What VT model is this? And are there any other mods apart from the SC?

Dyno graphs?

Well done dude!
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      10-12-2011, 02:59 PM   #15
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Excellent feedback
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      10-12-2011, 03:43 PM   #16
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Quote:
Originally Posted by Crazy Bimmer View Post
So glad i never been in a car that has it.
don't go anywhere near IND


Nice writeup brosef
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      10-12-2011, 06:28 PM   #17
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Quote:
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Excellent feedback
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