SC confused !

[m33]

Here is some depth to power delivery and how and where its effective, These are the RPM drops in various gears for 6MT and DCT assuming factory final drive ratio:

6MT with 8400 RPM shifting ("normal" M3)
1st: 1500-8400
2nd: 4905-8400
3rd: 5610-8400
4th: 6331-8400
5th: 7045-8400
6th: 7327-8400

6MT with 8100 RPM shifting ("AA redline" M3)
1st: 1500-8100
2nd: 4730-8100
3rd: 5410-8100
4th: 6105-8100
5th: 6793-8100
6th: 7065-8100

DCT with 8400 RPM shifting ("normal" M3)
1st: 1500-8400
2nd: 5158-8400
3rd: 6167-8400
4th: 6447-8400
5th: 6936-8400
6th: 7296-8400
7th: 6978-8400

DCT with 8100 RPM shifting ("AA redline" M3)
1st: 1500-8100
2nd: 4972-8100
3rd: 5948-8100
4th: 6312-8100
5th: 6687-8100
6th: 7035-8100
7th: 6729-8100

[Sales@Evolve]

Originally Posted by DLSJ5

Sal, thanks for posting, I knew it would only be a matter of time before you did.

Currently there are no independent dyno's or customer feedback on your kit, so to be fair I can't comment on your system, and all of what you say may very well be true, if so let's see it. Based on what many of your customers say about you and your products, I'm sure your kit will be a good choice, looking forward to some customer feedback / results and congrats on the kit, developing a system that is reliable and satisfies the consumer is no easy task.

Thanks for your comments.

It's only a matter of time until you do see it.

There have been some independent reviews of the drive of our demo car and the drag strip results with poor traction. It certainly does perform.
Our first production kits are being delivered to the US in 5-6 weeks and one of the dealers is fitting a pre production version in a few weeks.
Lots of information to come.

[DLSJ5]

Originally Posted by m33

Here is some depth to power delivery and how and where its effective, These are the RPM drops in various gears for 6MT and DCT assuming factory final drive ratio:

6MT with 8400 RPM shifting ("normal" M3)
1st: 1500-8400
2nd: 4905-8400
3rd: 5610-8400
4th: 6331-8400
5th: 7045-8400
6th: 7327-8400

6MT with 8100 RPM shifting ("AA redline" M3)
1st: 1500-8100
2nd: 4730-8100
3rd: 5410-8100
4th: 6105-8100
5th: 6793-8100
6th: 7065-8100

DCT with 8400 RPM shifting ("normal" M3)
1st: 1500-8400
2nd: 5158-8400
3rd: 6167-8400
4th: 6447-8400
5th: 6936-8400
6th: 7296-8400
7th: 6978-8400

DCT with 8100 RPM shifting ("AA redline" M3)
1st: 1500-8100
2nd: 4972-8100
3rd: 5948-8100
4th: 6312-8100
5th: 6687-8100
6th: 7035-8100
7th: 6729-8100

Interesting the above formula for the lower gears don't quite match what I thought the approximate rpm level was after the shift but I'd didn't go by formulas, which are fine, but rather I went by actual WOT runs on my car and others, as well as speedo/tach vids, but to be fair, not standard M3's, and mainly SC'd cars like these and all DCT as well -

The driver started in 3rd gear on this.

[DLSJ5]

Originally Posted by Sal@Evolve

Thanks for your comments.

It's only a matter of time until you do see it.

There have been some independent reviews of the drive of our demo car and the drag strip results with poor traction. It certainly does perform.
Our first production kits are being delivered to the US in 5-6 weeks and one of the dealers is fitting a pre production version in a few weeks.
Lots of information to come.

Sounds good Sal.

[VCMpower]

Originally Posted by Superfly_M3

Same here, lets move on.

[VCMpower]

raises all around!

Originally Posted by Team Plutonium

If he his still confused we did our job.

[VCMpower]

great read! I look forward to hearing more of your knowledgeable opinions on the HKS 8555 when you see more of them on the S65.

Originally Posted by Sal@Evolve

Very cute. Group Sex... haha

Anyway, just so that nothing is confused further here I'd just like to point something out.

The Rotrex C38-91 blower delivers 1134CFM adjusted to the same standards as which the Vortech is showing 1150CFM (SAEJ1723). So there is nothing between them and depending on how the blowers are geared (pulley size) you can make that CFM at various points in the RPM range.
The peak airflow is extremely similar on both.

That's from studying the compressor maps.

How do they actually stack up against each other on the same platform?

Over 6000rpm, very very similar! With the Rotrex you can clearly see this from the graphs we have posted that the HP continues to rise to the rpm limiter (8300rpm). No tailing off, no letting up. It's got the airflow..... well, if it didn't we would have not used it! Would make absolutely no sense as we have no allegiances to Rotrex!

The Vortech differs in it's power delivery mainly below 6000rpm WOT but not by a huge amount. If we are aiming both blowers to make around 6.5-7 PSi there is a difference but around 1-1.2 PSi. You see this on the HKS vs Vortech graphs and there is a difference in midrange HP/Torque.

The main difference comes under part load conditions and throttle response. This is where the much faster spinning Rotrex shows a significant improvement over the Vortech and it makes complete sense if you study the compressor maps and think about efficiency.
However, you cannot have your cake and eat it if this is happening.

What would the Rotrex also be also doing at the same time which the Vortech isn't at these lower-mid rpms ?
Surely there must be a trade off? If it's able to produce more torque (therefore boost) at lower - mid rpm's it's not without a compromise.
What could that be?
It's producing more heat at it's obviously compressing the air more. This means you have to design a cooling system which is even more efficient than the norm. This adds costs. This adds more work in design time and testing.

At the higher rpm's the amount of heat produced is around the same as expected as both blowers have similar airflow output.

You can have excellent throttle response and extremely good torque throughout the entire RPM range and have the top end power to match BUT it requires a certain amount of additional engineering and therefore cost.

There is a way to make the Vortech produce the same torque low-mid rpm and under partial load with the same top end power it's currently producing on kits but the costs involved and the size of the intercooler core required are not something anyone would entertain.

A Rotrex C38-91 delivers a fair bit more airflow than the HKS 8550. You cannot compare these two blowers.

Now, how do we know all of this? We have used Vortech on an engine that requires even more airflow to get results than the S65 which is the S62. We know the differences from a practical stand point.
All the above is not from just some theoretical stand point but from actual real world testing (it actually costs very little to do once you are into a full blown project). We can use a Vortech if we want to and make the first production air to air intercooled Vortech setup in the world using the same plenum and intercooler.

We are tried to make a system where you can have the best of all worlds. I'm glad to say, we achieved it.

If people still insist on blindly insisting that the Rotrex cannot match the airflow of the V3Si even then.... well, we might just make that flat plate bracket which was designed a long time ago into production with a new intake system for those individuals...
Doesn't bother us other than having to make a certain quantity of them which is no big deal.

Should also point out that both blower types from actual experience have a fair bit more head room! Not that it should even be considered to be used on a stock engine!

I hope the above shows a little more balance in the comparison between the two and actually for once highlighting the differences which make sense with respect to the compressor maps issued by both companies.

[Sales@Evolve]

Originally Posted by VCMpower

great read! I look forward to hearing more of your knowledgeable opinions on the HKS 8555 when you see more of them on the S65.

Thanks.

Looking at the compressor map of the 8555 it shows a max CFM of 953 CFM or 27 m(3)/Min. However, it doesn't show under what conditions this is tested so it's hard to compare to any of the others. If conditions are similar it's about 10% under the peak CFM numbers of the V3Si and C38-91.
Spun to around 100,000 rpm it should deliver improved top end power over the smaller 8550 and even more midrange torque.
That's if you can get hold of these blowers!

[VCMpower]

That C38-91 is a special unit, works great on so many engines. I have the 8555 (and some other updates) sitting on my tool box ready to go! I am looking forward to it. Thanks for your input Sal. BTW I can't help but look at your SC setup over and over, so tight!

Originally Posted by Sal@Evolve

Thanks.

Looking at the compressor map of the 8555 it shows a max CFM of 953 CFM or 27 m(3)/Min. However, it doesn't show under what conditions this is tested so it's hard to compare to any of the others. If conditions are similar it's about 10% under the peak CFM numbers of the V3Si and C38-91.
Spun to around 100,000 rpm it should deliver improved top end power over the smaller 8550 and even more midrange torque.
That's if you can get hold of these blowers!

[Donbona]

Originally Posted by DLSJ5

So when you go WOT on the street, you're not above 6800RPM 97% of the time?

I reserve the right to remain silent as I may lose my drivers license

[SflBimmer8484]

Originally Posted by DLSJ5

Well said, I like Andrew too, and when things are posted on the internat, rather than having a face to face discussion, things can be misintepreted and people get defensive at times, including me. I disagree with him in so many ways about the S65, lol, but he's still a cool dude, we're talking cars here not politics, lol.

THis ..

[SflBimmer8484]

Originally Posted by Sal@Evolve

Thanks.

Looking at the compressor map of the 8555 it shows a max CFM of 953 CFM or 27 m(3)/Min. However, it doesn't show under what conditions this is tested so it's hard to compare to any of the others. If conditions are similar it's about 10% under the peak CFM numbers of the V3Si and C38-91.
Spun to around 100,000 rpm it should deliver improved top end power over the smaller 8550 and even more midrange torque.
That's if you can get hold of these blowers!

We got a couple in the oven Sal 10psi gave us around 560 whp on a stock engine and more midrange as well. A little less boost and a few more things to change tuning wise and it should be a nice little upgrade.

If you remember our blue car with the built engine it put down the same hp as our stock engine with the same blower and a tiny bit more boost. The compression is little to low for the rotrex blower to handle and a larger one will be needed to get those high hp numbers we want to see.

[SflBimmer8484]

Originally Posted by Sal@Evolve

Thats pretty cool! They did mention air to air is proven to be better than air to water intercooling

[VCMpower]

Who needs midrange? ouch. 135 style midrange Andrew? KIDDING,
I am excited!

Originally Posted by Andrew@ActiveAutowerke

We got a couple in the oven Sal 10psi gave us around 560 whp on a stock engine and more midrange as well. A little less boost and a few more things to change tuning wise and it should be a nice little upgrade.

If you remember our blue car with the built engine it put down the same hp as our stock engine with the same blower and a tiny bit more boost. The compression is little to low for the rotrex blower to handle and a larger one will be needed to get those high hp numbers we want to see.

[SflBimmer8484]

Originally Posted by VCMpower

Who needs midrange? ouch. 135 style midrange Andrew? KIDDING,
I am excited!

You know my car makes more midrange than a supercharged m3 but the m3 feels like a uncontrollable monster on street tires in comparison. Maybe ill get one with my christmas bonus

They took the built engine car our for some 60-130's and couldn't get one good run due to tire spin. I cant even imagine what they 700+whp cars feel like.

[VCMpower]

Yep, I have trained myself to forget the truck loads of torque my 335 had It is not a bad tradeoff having a Sc'd M3. Those 60-130 runs would have been a blast! Who drove?

Originally Posted by Andrew@ActiveAutowerke

You know my car makes more midrange than a supercharged m3 but the m3 feels like a uncontrollable monster on street tires in comparison. Maybe ill get one with my christmas bonus

They took the built engine car our for some 60-130's and couldn't get one good run due to tire spin. I cant even imagine what they 700+whp cars feel like.

[SflBimmer8484]

Originally Posted by VCMpower

Yep, I have trained myself to forget the truck loads of torque my 335 had It is not a bad tradeoff having a Sc'd M3. Those 60-130 runs would have been a blast! Who drove?

Scrap did. The car has some 20 inch rims on it with some low profile Hankook v12's. No bueno

Id trade for the v8 sound anyday.

[m33]

Originally Posted by Andrew@ActiveAutowerke

Thats pretty cool! They did mention air to air is proven to be better than air to water intercooling

They sure did. And these two videos show the true superiority of air-to-air as well. Side-by-side results, nothing is more fair comparison that that Andrew.

[DLSJ5]

Originally Posted by Andrew@ActiveAutowerke

We got a couple in the oven Sal 10psi gave us around 560 whp on a stock engine and more midrange as well. A little less boost and a few more things to change tuning wise and it should be a nice little upgrade.

If you remember our blue car with the built engine it put down the same hp as our stock engine with the same blower and a tiny bit more boost. The compression is little to low for the rotrex blower to handle and a larger one will be needed to get those high hp numbers we want to see.

Andrew, what blower is on the Stage 3 car? What CR are you guys running? Did you sleeve the motor? You ran 10psi on the stock motor and made some good power, what psi are you running on the built motor?

[DLSJ5]

Originally Posted by VCMpower

Yep, I have trained myself to forget the truck loads of torque my 335 had It is not a bad tradeoff having a Sc'd M3. Those 60-130 runs would have been a blast! Who drove?

Ahhhh, so you too are a former N54 owner, it all makes sense now! Do you guys have any 60-130 runs with your setups?

[MStar]

Originally Posted by Team Plutonium

I heard the 335 has tons of torque. How do you drive these things without crashing? Is it street legal?

You dont...crashed mine last year..

[MStar]

Originally Posted by Team Plutonium

Sorry to hear. Looks like you got yourself a silver-lining though.

Yep it all worked out in the end..