Getting Best MPG during Cruise - Page 11

Clipse3GT · Nov 9, 2009, 09:16 PM

I think you are better off with getting your injector scaling dead on the ball and then upping the timing in cruise range. You will be better off with those settings.

I upped my timing more and managed to get about 2-3 mpg more at cruise with my injector trims at +1% idle and -0.5% cruise. Pretty close to 0, maybe the cruise fluctuates at more +/- 2%

tephra · Nov 9, 2009, 09:21 PM

scalings or latencies?

scaling shouldn't really have an impact on MPG, since the trims will bring it back into place.

latencies on the other hand...

Methodical4u · Nov 9, 2009, 09:34 PM

Quote:

Originally Posted by Clipse3GT

I think you are better off with getting your injector scaling dead on the ball and then upping the timing in cruise range. You will be better off with those settings.

I upped my timing more and managed to get about 2-3 mpg more at cruise with my injector trims at +1% idle and -0.5% cruise. Pretty close to 0, maybe the cruise fluctuates at more +/- 2%

I increased timing +3 degrees from 2500-4000 0-40 load... it did help me some.. i'm not getting the 30 mpg that HiBoost is getting either... but as I had asked, I don't know if that's because of the less restrictive mods he has or not.

Clipse3GT · Nov 9, 2009, 09:53 PM

Quote:

Originally Posted by tephra

scalings or latencies?

scaling shouldn't really have an impact on MPG, since the trims will bring it back into place.

latencies on the other hand...

I meant it as both items. Most of the times you need to adjust both to get it right. If you adjust one and the other goes out of wack. So it's a bit balancing act.

So I meant adjust injector trim = latency & scaling.

Clipse3GT · Nov 9, 2009, 09:56 PM

Quote:

Originally Posted by Methodical4u

I increased timing +3 degrees from 2500-4000 0-40 load... it did help me some.. i'm not getting the 30 mpg that HiBoost is getting either... but as I had asked, I don't know if that's because of the less restrictive mods he has or not.

I increased timing about 2-3 degree in the areas from 40-70% load and from 2250 to 4500 range. No knock at cruise. But the MPG increase was significant. Mixed HWY and City I easily average 22-23mpg, not really babying the car either but just regular driving and giving it a boot full on the ramps. I am sure on a long trip I could average about ~25 on the highway.

Whitewind · Nov 10, 2009, 07:27 AM

You know I have not even F'ed with this because I don't drive my car much maybe next summer I'll play with this. Seems be help a lot of people out that are DD.

Methodical4u · Nov 10, 2009, 04:35 PM

Quote:

Originally Posted by Clipse3GT

I increased timing about 2-3 degree in the areas from 40-70% load and from 2250 to 4500 range. No knock at cruise. But the MPG increase was significant. Mixed HWY and City I easily average 22-23mpg, not really babying the car either but just regular driving and giving it a boot full on the ramps. I am sure on a long trip I could average about ~25 on the highway.

I may give this a try... just 2* from 40-70 and see what happens.

palmerblock · Nov 11, 2009, 01:51 AM

currently if i drive my car 65mph i get 28.5mpg, 75mph 25-26mpg, 85mph 23-25, 95mph 21-23.5 mpg...

this is b4 i made some recent part throttle changes to my map....ill have to retest and see what it does...not to shabby based on how ****ty this car came from the factory...

Methodical4u · Nov 15, 2009, 12:12 AM

Quote:

Originally Posted by palmerblock

currently if i drive my car 65mph i get 28.5mpg, 75mph 25-26mpg, 85mph 23-25, 95mph 21-23.5 mpg...

this is b4 i made some recent part throttle changes to my map....ill have to retest and see what it does...not to shabby based on how ****ty this car came from the factory...

how do you have your timing/anything else set? Any mods on the car?

*edit* oh I see the FPred... that could make a difference too I guess.

Methodical4u · Nov 15, 2009, 12:13 AM

Quote:

Originally Posted by Clipse3GT

I increased timing about 2-3 degree in the areas from 40-70% load and from 2250 to 4500 range. No knock at cruise. But the MPG increase was significant. Mixed HWY and City I easily average 22-23mpg, not really babying the car either but just regular driving and giving it a boot full on the ramps. I am sure on a long trip I could average about ~25 on the highway.

so do you think it's safe to adjust the 40-70 load 2 degrees?

Hiboost · Nov 15, 2009, 09:28 AM

Quote:

Originally Posted by Methodical4u

so do you think it's safe to adjust the 40-70 load 2 degrees?

I'm getting away with it but you definitely have to be carefull not to go too far and reduce power again. I'm sure the factory timing maps are somewhat conservative and on the low side of the optimal timing slope for any given RPM and load.

Methodical4u · Nov 15, 2009, 10:17 AM

Quote:

Originally Posted by Hiboost

I'm getting away with it but you definitely have to be carefull not to go too far and reduce power again. I'm sure the factory timing maps are somewhat conservative and on the low side of the optimal timing slope for any given RPM and load.

yeah, that's why i'm trying just 2 degrees, instead of 3... I thought that would help at least some

E6-X · Nov 15, 2009, 11:12 AM

i also increased 2 deg timing. did some logging during cruise to get better milage

cruise @ 100 km/h load @ 40-60 range, cruise control on & rpm is @ approx. 2500

cruise @ 120 km/h load @ 50-80 range, cruise control on & rpm is @ approx. 3000

didn't note how much milage gained but definitely increased. was monitoring the milage after refuelling full tank.

i would try again by increasing 2 deg timing @ 2250-3500 rpm & load from 40-80. should be on the safe side.

Clipse3GT · Nov 16, 2009, 11:48 AM

As long as your IAT and CTS temps are within range and no knock.I say it's fine to advance the timing 2-3 degs in the 50-70 load areas. I did it and managed about 24mpg going 75mph on a 180 mile trip.

UT_EvoX · Nov 16, 2009, 12:25 PM

I managed roughly 26-27 mpg (at the pump) on a 1500 mile journey using 42 degrees BTDC advance in 40-80 load cells at highway cruise. Speed was between 70-80 mph the whole trip.