I know we like our cars to haul ass so mpg is not important to most of us. BUT if I were to want to have a gas sipping tune, could I just mod the stock tune for going back and forth to work and put the 93 tune for playing? I thank yes I could, so what I really want know is what to change to get max mpg?
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AGP hot and cold ic pipes, Needswings v6 dp, mccord plate, Auto meter EGT and wide band, Magnaflow ext,BFMIC,AGP dog bones and trans mount, AGP wast gate,S1, WOT box, DSP.
tune for 15-16 A/F in low vac for some good mpg, it wont lose to much power but will put out some serious nox (oxides of nitrogen) and will not pass any emmisions test (mother earth will not be happy with you).....this should only be done in low vac as any mid vac will raise the EGTs pretty high
I know we like our cars to haul ass so mpg is not important to most of us. BUT if I were to want to have a gas sipping tune, could I just mod the stock tune for going back and forth to work and put the 93 tune for playing? I thank yes I could, so what I really want know is what to change to get max mpg?
We have played with this a bit, easiest way to get more HP out of your car... kill the WGA duty cycle. Limit the boost to 5 psi, raise the knock sensor levels and bump the timing way up.
You can pick up 5 MPG easy, but the car is slower than a stock NA Neon.... yea!
tune for 15-16 A/F in low vac for some good mpg, it wont lose to much power but will put out some serious nox (oxides of nitrogen) and will not pass any emmisions test (mother earth will not be happy with you).....this should only be done in low vac as any mid vac will raise the EGTs pretty high
Forcing the stock PCM to 15 or 16 AFR's causes all sorts of crap to go wrong with the tune. Keep it at the target 14.7 and mess with the other areas like timing and boost pressure.
We even tried to lower the TQ tables a bit and that worked really well, car is just slow as a turd.
ok, thanks for the info. I will have to give this a shot once I get use to using the DSP.
Just pay attention to how you drive the thing. Staying out of boost and in vacuum will cure most of that.
I usually get around 23 city, and around 29-30 highway with my stocker. (depending on fuel)
-Will.
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Stage 1 ECM (NOT stock), Diablosport Predator, 3 bar map and tip, Interceptor Scangauge, AEM wideband, 750's (no return-line), MPX BFMIC, Walbro 255, DCR top end modifier, AGP WGA, 3 in O2 housing, QTP 3in downpipe with E-cutout stock catback, Nitrous Oxide Systems 65 HP shot, motor mount inserts.
Best MPH to date on the bottle,119.04 --- Off the bottle 113.55. --- best ET 12.44. on borrowed DR's. Stock turbo, stock Mani.
I had my target closed loop afr changed from 14.37 (stage 1) to 14.66 with the dsp and I have not noticed a gain in mpg nor seen a change in my wideband readings. Now the other day when we where tuning my friends supra with the aem ems as we where driving and tuning for mpg cruising we could actually see the wideband changing to a nice gas saver readings on his wideband. So I don’t think my mpg tune add on is working. that and on a trip to orlando i got 18 mph highway
I had my target closed loop afr changed from 14.37 (stage 1) to 14.66 with the dsp and I have not noticed a gain in mpg nor seen a change in my wideband readings. Now the other day when we where tuning my friends supra with the aem ems as we where driving and tuning for mpg cruising we could actually see the wideband changing to a nice gas saver readings on his wideband. So I don’t think my mpg tune add on is working. that and on a trip to orlando i got 18 mph highway
18 MPG, good god that sucks.
I should mention guys, that if you have an aged o2 sensor, get it replaced. They should be replaced every 60k miles if not sooner.
We have played with this a bit, easiest way to get more HP out of your car... kill the WGA duty cycle. Limit the boost to 5 psi, raise the knock sensor levels and bump the timing way up.
You can pick up 5 MPG easy, but the car is slower than a stock NA Neon.... yea!
hey im in the same spot as this guy i have a long drive to school everyday and would love to get an extra 5 mpg. is there anyway i can get the details on what yall did. see im gunna be buying a dsp in less then a month. and is there a limit to the mods you canhave to mantain half decent mpg?
that and on a trip to orlando i got 18 mph highway
Quote: Originally Posted by Exodus_gs1
hey im in the same spot as this guy i have a long drive to school everyday and would love to get an extra 5 mpg. is there anyway i can get the details on what yall did. see im gunna be buying a dsp in less then a month. and is there a limit to the mods you canhave to mantain half decent mpg?
If you guys want an easy 3-4 MPG bump unhook the wga rod from the wg lever arm. Your car will be slow as hell but it will ensure you stay out of boost---the #1, #2 and #3 killer of mpg.
Letxen3, changing the stoich A/F in the PCM doesn't do anything but mess things up. Whatever you set that value at the Cruise A/F is still "adjusted" back to 14.7 by the LT and ST fuel trim via the Upstream O2 sensor. Since any and all narrowband O2 sesnors switch at a true Stoichmm its hard to tune around it,,,unless you alter the O2 sensors output
If you guys want an easy 3-4 MPG bump unhook the wga rod from the wg lever arm. Your car will be slow as hell but it will ensure you stay out of boost---the #1, #2 and #3 killer of mpg.
Letxen3, changing the stoich A/F in the PCM doesn't do anything but mess things up. Whatever you set that value at the Cruise A/F is still "adjusted" back to 14.7 by the LT and ST fuel trim via the Upstream O2 sensor. Since any and all narrowband O2 sesnors switch at a true Stoichmm its hard to tune around it,,,unless you alter the O2 sensors output
That's what I was going to say as well. However you can change the point at which the O2 switches to enlean or enrichen the cruise mixture. I have not messed with this on these cars with Diablo but I have done this many times on Ford's and GM's to increase low load fuel mileage significantly.
That's what I was going to say as well. However you can change the point at which the O2 switches to enlean or enrichen the cruise mixture. I have not messed with this on these cars with Diablo but I have done this many times on Ford's and GM's to increase low load fuel mileage significantly.
I'll do some looking around on this for the SRT4.
I've changed the O2 voltage switch point and % too on other cars, but I don't see anything in the CMR. I'm sure its in the PCM because I monitor the PID "O2 Voltage GOAL" when I'm testing mpg. This voltage goal seems to move around with ECT, VSS and maybe TPS. I doubt DS will be very excited about adding it to all the templates.
Last edited by duster360 : 09-09-2009 at 08:38 AM.
I've changed the O2 voltage switch point and % too on other cars, but I don't see anything in the CMR. I'm sure its in the PCM because I monitor the PID "O2 Voltage GOAL" when I'm testing mpg. This voltage goal seems to move around with ECT, VSS and maybe TPS. I doubt DS will be very excited about adding it to all the templates.
I just looked too and I don't see it anywhere either. I'm sure it won't get added to the templates.
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tunning for max MPG
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