Quite a few times when I accelerated from a stopped position, I don't feel the power until around 4,000rpm. It feels like a boost.

From my understanding, is it true that only turbochargers have this sudden boost b/c of turbo lag?

Superchargers shouldn't have this boost b/c it's a belt driven air compressor, right?

Then why did I feel that boost? At under 4,000rpm, it felt like the car didn't have power to go.

 

If you look at the various dyno charts on this forum you would see that are within 90% of torque across most of the power band and that HP increase steadly until about 5,500 rpm. If you don't feel power until 4,000 rpm then something is wrong with your car. Get a demo/loaner at your dealer and try it out. My car pulls evenly from 2,000 to redline before and after the performance pulley.

 

Excellent advice. A supercharger should be felt without the so-called "turbo lag".

 

Can someone post the dyno for the stock C Coupe.

 

Use the much lower HP/Torque numbers on this chart for my stock C230 Coupe - 6 spd.

https://mbworld.org/forums/showthrea...threadid=11358

 

just a thought.....

was the AC on? many cars (bmws for sure) will cut the compressor at full throttle and above x,xxx rpm. it could may well be that the computer is cutting the compressor at 4000 rpm because it senses a need to max accleration. there is enough thermal energy existing in the cooling system to keep blowing cool air for 30 seconds or so, so you will not notice a change in HVAC output.

...just a thought.

 

Yes, the AC was on. I notice the car drinks a lot of fuel with the AC on too. Do you guys get that?

 

Good catch, dasMafia. (btw, I hope there isn't a real reason for your chosen name...)

I know Miatas will actually cut the A/C if you go above 4K rpms and re-engage it after a set time-- read it somewhere. The M-B may very well do the same. Test again with the A/C off. If it still happens, it may be a normal result of the throttle-by-wire-- if it is really minor, for example if a passenger in the car can't feel it, but you as the driver can.

I am starting to hope that those of us who post problems are in the minority and I shouldn't expect these problems as long as I own....

 

What is a throttle-by-wire?

 

i thought that button under the throttle pedal turned off the a/c at full throttle.
i wouldn't know it i got worse gas milage with out my a/c. has someone actually turned it off???? i live in east county san diego, it is hot here year round.

 

um, i've turned the ac off a couple fo times but it;s usually on. i dont see much difference in the mileage so it doesnt bither me since i get better than sticker mileage anyway. btw, how hard were you pushing in the pedal? bc from what i've read, under low acceleration supercharger won't even kick in.

 

The throttle pedal is not connect to the throttle body mechanically. A sensor reads the position of the pedal and reports that to the ECU. The ECU then opens the throttle body to the optimum position for the conditions.

 

Because of the fact that sensors are used to transmit the my foot action to the ECU, could there be a delay in the computers "sensing" reaction, thus seeing a lag b4 the SC kicks in?

Wouldn't using a mechanical throttle be more efficient and faster than having an electronic one?

 

sdcaclint

you have the longest list for your mods, let's see some pics!

 

...no

 

A lot of people open there windows on the highway or something to save gas rather than using A/C... but in actuality, the windows being open causes a lot more air resistance and uses up more fuel than the A/C. This doesn't apply to all cars and all A/C settings though.

 

Quite a few cars are going to throttle by wire now. With modern processor speeds there are no worries about delays, and having a computer control the throttle opens up a bunch of possibilities for tuning how the car drives. Plus they can tie it in to ABS and traction control and stability control and cruise control and...

 

Yes well that is true just think how much air gets trapped in your car with the windows open on the highway.



I was never able to tell if my car uses more gas with th A/C on or off. Probally because its never off.

Also if u ever go to a drag strip make sure u shut your air and keep your windows closed, it definitly cuts down the drag.

My friend with a prelude raced with his window open no air on, windows closed and air on, and windows closed with no air gave him the best time. It did make a nice difference in his times so i guess its true.