S Mode and mileage difference on/off

sp911

no. it is a good question. i also wondered that since when the car revs i would think it would be using more gas.

Chuck33079

But you rev the car manually when you downshift with S mode off, so it's a tiny difference at best.

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cooltoy

Beat me to it.

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rapala

Ok i got to ask,why do you rev the car manually when you downshift ?

mab864

I think any difference would be so small that it would take scientific instrumentation to detect... if there is any difference at all.

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SurfDog

I put in a lightweight flywheel. There is no way I could rev THAT fast and hit my target RPM. I can't imagine that using SRM has any measurable affect on MPG. it will save money replacing your clutch though. Theoretically, it eliminates most of the wear on your clutch pads. (At lest on shifts)

I forgot to turn it on at the track once and almost left the pavement. (I usually DD with it off). I don't think it would take many trips off the track and into the (hopefully) dirt to negate your fuel savings

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370ZinSC

I get about 1 more MPG with the SMode off. I ran two tanks with on and two with off. It really depends on your driving style though. And to the earlier point, the four tanks were not controlled and identical. So I can't say 100% that MPG is better with off.

Zoren 370

Just curious if it does make you save significant Mpg with the S mode turned off, hypothetically would you rather not have the technological benefit of the SrM just for you to save Mpg?

If the hypothetical logical question is valid. My conclusion would be just drive a toyota prius.

Haboob

The difference is probably negligible. I never drive the same way twice. Sometimes I punch it on the on-ramp, sometimes I don't, etc.

I could never do this study and have equal scenarios with SRM on and with SRM off.

damian_mb

lmao, people are funny when they say RPM drops below 2K RPM's in nuetral coming off hwy. I guess they need a video to PROVE them wrong. In S mode the RPMS stay higher coming off the hwy or while rolling and drops once you are completely stopped.

As far as screwing up your mpg, should be minimal. Also like someone else said, if you are worried about mpg, this isn't the car for you.

Try driving my WRX then talk to me about MPG. Drive it hard or grandma style, either way it gulps gas. Get on the gas, and watch the needle go down right before your eyes :P

Read T

I was just blasting around the mountains with a friend who was driving his WRX. He was averaging low 20s (MPG) and I was getting about 15.

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ghost_ix

my '13 WRX would consistently be in the low 20's, hard driving or not. My Z gets me 15-19 when pushing it

jpkirk

In all fairness, the Z's cup holds an extra 1.7 liters. Bigger cup, more fuel.

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Haboob

You mean a video like this that I just took?

http://vid484.photobucket.com/albums...psny1q0e34.mp4

Pretty sure that's SRM allowing it to go below 2,000 RPM.

Read T

I think the only way to test this would be to put the car on a dyno and establish a certain number of shifts and time of the shifts. There will be no way to test this in daily driving. There probably is a difference between on/off but it's so small it is probably difficult or impossible to measure. I do turn off SRM when the "E" light is on just in case.

With SRM on the engine will initially try to rev-match (not drop the RPM below 2000 maybe) if you are cruising at highway speed and then pop it into neutral to slow down for a stoplight if you aren't gearing down or pressing in the clutch.

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