Ess 620 Fuel Consumption

[TurboPR]

Guys,

Contemplating on installing a ESS 620 on my 2013 M3, since the 650 is not really that much more gains vs price. The question I have is how much more fuel consumption for a daily driver I should expect to see? As a law abide citizen of course

[BrewRifle]

It will be similar to stock if you keep the revs low. The centrifugal blower doesn't even build boost until ~4.5k RPMs.

[Locksmythe]

Originally Posted by BrewRifle

It will be similar to stock if you keep the revs low. The centrifugal blower doesn't even build boost until ~4.5k RPMs.

As a casual observer of the supercharger threads, this seems counter-intuitive. Sounds a lot like turbo lag to me...

[squartus]

I think on my old stock 625 I got 19.6MPG on a 1000 mile drive, wrote it all down since changing the fuel injectors throws off the cars onboard MPG monitor and can't be used.
So steady at HWY speeds you might loose 2MPG or so vs stock

[BrewRifle]

Originally Posted by Locksmythe

As a casual observer of the supercharger threads, this seems counter-intuitive. Sounds a lot like turbo lag to me...

Boost builds as the RPM's rise with a centrifugal supercharger...

A very simple division between the two is low-end power that drops off with a positive displacement superchargers vs. linear power with a centrifugal type supercharger that increases with engine rpm. The linear curve from a centrifugal supercharger compliments an engine’s existing power band, instead of working against it like a roots or twin-screw. Another significant benefit is that the efficiency of a centrifugal is much higher, meaning a smaller amount of the work that goes into turning the compressor gets converted to heat with a centrifugal vs. a positive displacement supercharger, and especially so vs. a roots type supercharger. So it takes less energy to make power with a centrifugal, and the power that is created is much more usable power.

Here's an ESS-625 dyno showing the boost building - http://www.bigdynodatabase.com/DynoG...0068-DLSJ5.jpg

[SYT_Shadow]

A coworker moved from the ESS 625 to the ESS 650 kit and said the difference was noticeable

[SYT_Shadow]

Originally Posted by BrewRifle

Boost builds as the RPM's rise with a centrifugal supercharger...

A very simple division between the two is low-end power that drops off with a positive displacement superchargers vs. linear power with a centrifugal type supercharger that increases with engine rpm. The linear curve from a centrifugal supercharger compliments an engine’s existing power band, instead of working against it like a roots or twin-screw. Another significant benefit is that the efficiency of a centrifugal is much higher, meaning a smaller amount of the work that goes into turning the compressor gets converted to heat with a centrifugal vs. a positive displacement supercharger, and especially so vs. a roots type supercharger. So it takes less energy to make power with a centrifugal, and the power that is created is much more usable power.

Here's an ESS-625 dyno showing the boost building - http://www.bigdynodatabase.com/DynoG...0068-DLSJ5.jpg

centrifugar 'chargers on the S65 are a thing of beauty... it's like a 6L, 8600rpm monster with zero lag

[Patrón]

I daily my 625 kitted car and get 13-14 avg mpg per the obd/stalk indicator. my commutes are in-town about 5-7 miles per day. if i go out on a drive with friends and play, it's in the 10-12 range.
I don't see the kits having much difference in mpg, when commuting my boost readings are less than 2 psi max boost(unless i have fun). Always go with the highest kit possible when purchasing the first time, it saves money in the long run and you will always want more power.

[SonnyJack]

Originally Posted by TurboPR

Guys,

Contemplating on installing a ESS 620 on my 2013 M3, since the 650 is not really that much more gains vs price. The question I have is how much more fuel consumption for a daily driver I should expect to see? As a law abide citizen of course

This was one of the first things I noticed after having my kit installed. I went with AA, but I noticed a definite increase in fuel consumption.

Worth every extra gallon used!

[TurboPR]

So if the fuel consumption is not that much more I guess now is decision making ESS 625 or 650. Is the 650 really worth the money. I don't see too many of them in the forum 75% is ESS 625.

[BrewRifle]

Originally Posted by TurboPR

So if the fuel consumption is not that much more I guess now is decision making ESS 625 or 650. Is the 650 really worth the money. I don't see too many of them in the forum 75% is ESS 625.

It's a tough call as you're paying $1,700 extra for +25HP and +10ft/lbs when looking at new. If you can find a used one that price split becomes even less so it would be worth it. You're also adding 1.5-2.0 PSI increase from 625 to the 650. I went with the 625/410 kit to get the best of both worlds: liquid intercooler and really solid numbers for $900 more than the 595/395 kit with slightly less boost.

[TurboPR]

How do you like your 625 compare to stock? Does it pulls good? Also what boost gauge you are using?

[Bucki14]

Originally Posted by TurboPR

How do you like your 625 compare to stock? Does it pulls good? Also what boost gauge you are using?

Night and day, difference. It's literally like having supercar like performance. My car is on par with the ZR1 and any v8/v10 supercar around.

It builds boost like a dream and the curve is so addicting because its so controllable. It compliments the car so well you will regret not doing it sooner.

The only downside is that you enter speeding territory so fast, so less time to enjoy going through the gears. But with High RPM motor and solid horsepower numbers makes it perfection.

I use an ACM p3 guage which isn't bad

[PetrolFumes]

Originally Posted by Bucki14

Night and day, difference. It's literally like having supercar like performance. My car is on par with the ZR1 and any v8/v10 supercar around.

It builds boost like a dream and the curve is so addicting because its so controllable. It compliments the car so well you will regret not doing it sooner.

The only downside is that you enter speeding territory so fast, so less time to enjoy going through the gears. But with High RPM motor and solid horsepower numbers makes it perfection.

I use an ACM p3 guage which isn't bad

love it. I'm about to get the 625 kit on mine. do we really need a boost gauge? or can live without it

[PetrolFumes]

Originally Posted by SYT_Shadow

A coworker moved from the ESS 625 to the ESS 650 kit and said the difference was noticeable

$1200 worth noticeable? I was contemplating between the 625 and 650 for a long time and finally just bought the 625 kit. hope I won't have that 650 number in the back of my head!

[TurboPR]

Originally Posted by PetrolFumes

love it. I'm about to get the 625 kit on mine. do we really need a boost gauge? or can live without it

Yes, you need a boost gauge is a big piece of mind, also if the blow off valve starts acting up you will see it before you blow up the engine.

[BrewRifle]

Originally Posted by TurboPR

Yes, you need a boost gauge is a big piece of mind, also if the blow off valve starts acting up you will see it before you blow up the engine.

Can you go into more detail about blow off valves causing blown supercharger engines? This is the first I've read about that on this forum.

Also, I assume you mean the diverter valve and not a blow off as that's what comes with the kits.

[SYT_Shadow]

Originally Posted by PetrolFumes

$1200 worth noticeable? I was contemplating between the 625 and 650 for a long time and finally just bought the 625 kit. hope I won't have that 650 number in the back of my head!

625 is a pretty stupid amount of power

I think you'll be more than happy. Besides, less stress on the engine is always good

[PetrolFumes]

Originally Posted by SYT_Shadow

625 is a pretty stupid amount of power

I think you'll be more than happy. Besides, less stress on the engine is always good

meaning the 650 kits extra psi putting stress on the engine? I guess

[PetrolFumes]

Originally Posted by TurboPR

Yes, you need a boost gauge is a big piece of mind, also if the blow off valve starts acting up you will see it before you blow up the engine.

no blow off valve here for me. but I'm definitely going to do gauge though. good looks

[SYT_Shadow]

Originally Posted by PetrolFumes

meaning the 650 kits extra psi putting stress on the engine? I guess

Yes, more psi and more stress. I firmly believe the 625 kit is the most balanced, and it's hard to imagine someone redlining that kit and thinking 'this is not fast enough'

[SYT_Shadow]

Originally Posted by PetrolFumes

no blow off valve here for me. but I'm definitely going to do gauge though. good looks

Yeah, don't do a BOV. Keep the kit completely stock