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TOV Forums > Optimizing Fuel Economy > > Re: Lowering the shift point: J30a4/6M

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ezshift5
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Lowering the shift point: J30a4/6M    (Score: 1, Normal) 12-26-2010 16:32
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As a follow-up to reading the positives in reducing shift point RPM, here's some feedback (FWIW):

1. Using 2500 RPM (down from 3500)
2. Fueling from same pump (same station) to reduce variables
3. Numbers: 2529 miles/87.2 gallons used
4. 29 MPG.
5. Notes: 65% HWY; 87 octane exclusively; winter fuel blend not known. Very few VTEC freeway on-ramp entrances........

ez....
superchg
Profile for superchg
Re: Lowering the shift point: J30a4/6M    (Score: 1, Normal) 12-26-2010 16:54
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No VTEC= No fun!
ezshift5
Profile for ezshift5
Re: Lowering the shift point: J30a4/6M    (Score: 1, Normal) 01-02-2011 10:25
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superchg wrote:
No VTEC= No fun!


No argument there, amigo............

Reckon this recession is sparing a large portion of TOV folk (not much traffic within this fuel efficiency arena.............)

best, ez....
ezshift5
Profile for ezshift5
Re: Lowering the shift point: J30a4/6M    (Score: 1, Normal) 02-16-2011 08:26
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.......fuel in California's capital (at this sailor's local Valero) has risen to $3.33 and 9/10........

....shift point reduction from 3500 to 2500 RPM seems to be nullifying the "winter fuel blues"..........

.....last two fillups calculate just under 29 MPG (65%highway)...

...and that includes a few VTEC-intensive freeway onramp entrys........................(all work and no play et al.........)

ez
99SI
Profile for 99SI
Re: Lowering the shift point: J30a4/6M    (Score: 1, Normal) 02-16-2011 08:44
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Just curious as to what tires you have on the car. Since I put BS Serenities on mine I have noticed a 1-2mpg drop in mpg. I used to be in the 29-30 range under those same circumstances while shifting at 2500 or so. Now it is 27-28.
ezshift5
Profile for ezshift5
Re: Lowering the shift point: J30a4/6M    (Score: 1, Normal) 02-16-2011 09:42
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99SI wrote:
Just curious as to what tires you have on the car.



Same size Michelin MXV4 replaced OEM HX MXM4 about 27,000 miles ago. Upside: they don't wear much. Downside would be all that Naval Reserve bread I laid out.........................

ez
Chris_6MT
Profile for Chris_6MT
Re: Lowering the shift point: J30a4/6M    (Score: 1, Normal) 02-16-2011 10:49
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It's fairly easy in this car to shift below 2000RPM if you're patient.

The best fuel economy will come from accelerating as quickly as possible (but do not go WOT - use 85-90% throttle) and fast shifting under 2000RPM. I have been tracking my fuel economy for the last 4 years and have noticed a surprisingly linear 0.5MPG drop per year (~30k miles) due to wear/tear on the engine (in '07 I averaged a hair under 29MPG, now I'm down to a hair under 27MPG).

But I don't shift at 2k very often, it's much more amusing to surprise 350Z's and Mustang GT's with my little family car. On Friday I bounced against the rev limiter when an automatic trans 350Z attempted to fly around me on the highway and was subsequently shocked when he couldn't.
TonyEX
Profile for TonyEX
Re: Lowering the shift point: J30a4/6M    (Score: 1, Normal) 02-24-2011 23:48
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Chris_6MT wrote:
It's fairly easy in this car to shift below 2000RPM if you're patient.

The best fuel economy will come from accelerating as quickly as possible (but do not go WOT - use 85-90% throttle) and fast shifting under 2000RPM. I have been tracking my fuel economy for the last 4 years and have noticed a surprisingly linear 0.5MPG drop per year (~30k miles) due to wear/tear on the engine (in '07 I averaged a hair under 29MPG, now I'm down to a hair under 27MPG).

But I don't shift at 2k very often, it's much more amusing to surprise 350Z's and Mustang GT's with my little family car. On Friday I bounced against the rev limiter when an automatic trans 350Z attempted to fly around me on the highway and was subsequently shocked when he couldn't.



Honestly, I don't know how you can drive a J30A4/MT6 slow.

I used to bury mine into the redline because that motor is sooo good in the midrange and top. You are right, the run to redline from 2nd on up is astonishing. That is one hell of a powertrain, lMHO much better than the VCM's J35s that have followed.

I used to get 22 mpg on my commute.
ezshift5
Profile for ezshift5
Re: Lowering the shift point: J30a4/6M    (Score: 1, Normal) 02-25-2011 09:32
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TonyE wrote
Honestly, I don't know how you can drive a J30A4/MT6 slow.

I used to bury mine into the redline because that motor is sooo good in the midrange and top. You are right, the run to redline from 2nd on up is astonishing. That is one hell of a powertrain, lMHO much better than the VCM's J35s that have followed.

I used to get 22 mpg on my commute.


Granted Tony(E) - sensible (AKA slow) J30a4 operation takes discipline. But it works. Last three tanks: 739.3 MI/25.093 GAL =just under 29.5. With winter fuel blend no less.

Saving my USNR bread for the 105,000 mile service; nothing out there on my replacement radar. Perhaps the GEN9 Accord will be a winner (as opposed to a weiner)

all the best, ez...........
99SI
Profile for 99SI
Re: Lowering the shift point: J30a4/6M    (Score: 1, Normal) 02-25-2011 10:07
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ezshift5 wrote:
TonyE wrote
Honestly, I don't know how you can drive a J30A4/MT6 slow.

I used to bury mine into the redline because that motor is sooo good in the midrange and top. You are right, the run to redline from 2nd on up is astonishing. That is one hell of a powertrain, lMHO much better than the VCM's J35s that have followed.

I used to get 22 mpg on my commute.


Granted Tony(E) - sensible (AKA slow) J30a4 operation takes discipline. But it works. Last three tanks: 739.3 MI/25.093 GAL =just under 29.5. With winter fuel blend no less.

Saving my USNR bread for the 105,000 mile service; nothing out there on my replacement radar. Perhaps the GEN9 Accord will be a winner (as opposed to a weiner)

all the best, ez...........


I am hoping the same on gen9. Otherwise this car may stay with me well past when I usually have moved on. How expensive could it possibly be to put a 6MT/Non-VCM J35 powertrain in the sedan? aka give the sedan the coupe treatment. I would pay an extra grand to have it.
ezshift5
Profile for ezshift5
Re: Lowering the shift point: J30a4/6M    (Score: 1, Normal) 04-03-2011 10:43
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99SI wrote:
ezshift5 wrote:
TonyE wrote
Honestly, I don't know how you can drive a J30A4/MT6 slow.

I used to bury mine into the redline because that motor is sooo good in the midrange and top. You are right, the run to redline from 2nd on up is astonishing. That is one hell of a powertrain, lMHO much better than the VCM's J35s that have followed.

I used to get 22 mpg on my commute.


Granted Tony(E) - sensible (AKA slow) J30a4 operation takes discipline. But it works. Last three tanks: 739.3 MI/25.093 GAL =just under 29.5. With winter fuel blend no less.

Saving my USNR bread for the 105,000 mile service; nothing out there on my replacement radar. Perhaps the GEN9 Accord will be a winner (as opposed to a weiner)

all the best, ez...........


I am hoping the same on gen9. Otherwise this car may stay with me well past when I usually have moved on. How expensive could it possibly be to put a 6MT/Non-VCM J35 powertrain in the sedan? aka give the sedan the coupe treatment. I would pay an extra grand to have it.



Shifting at 2500 vice 3500 (most of the time) - even with the dreaded winter fuel blend - is still giving good numbers.

In seasons past, it has averaged 25 -26 on winter blend; reduced RPM is giving closer to 27-28 on WBF...............

No complaints.
ezshift5
Profile for ezshift5
Re: Lowering the shift point: J30a4/6M    (Score: 1, Normal) 04-25-2011 16:41
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Shifting at 2500 vice 3500 (most of the time) - even with the dreaded winter fuel blend - is still giving good numbers.

In seasons past, it has averaged 25 -26 on winter blend; reduced RPM is giving closer to 27-28 on WBF...............

Update (2500 RPM shift point continues): 3-23 to 4/25-2011.

About 1200 miles/41 galllons of 87 gives circa 29.3 MPG!!

No complaints.
ezshift5
Profile for ezshift5
Re: Lowering the shift point: J30a4/6M    (Score: 1, Normal) 05-30-2011 17:43
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With the price of fuel remaining close to $4/gallon, I find it difficult to not find more interest in this fuel economy section of TOV.

FTW: last few tanks: 645.7 mles/21 gallons of 87. That's almost 31 MPG. All from lowering the shift point. And perhaps the shift from winter to summer blend fuel.

all the best from ez...................
 
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