getting tune
#31
03-19-2011, 11:27 PM
Frankly, this defies conventional wisdom regarding these cars. I'm not calling BS,
i wont take offense to anything i understand where your coming from
but seriously, if there was another 25whp and better gas mileage available from these engine, I cannot for the life of me imagine that the manufacturer wouldn't have tweaked it out for themselves.
i would agree on the earlier engines, but this motor is a transition and seems to not have the time spent on it that the v35de and v37de had/have
When you said you wanted to get a tune to improve gas mileage, I didn't expect you would realize much if any there (certainly NOT 8 or 9 mpg) , as they already factory tune them with a distinct bias toward economy and emissions.
i dont see this engine as being anything close to tuned from the factory to be efficient especially given the stock a/f ratios (in the mid 11's at the end of the rpms)we were seeing in the first dyno pull
Additionally, and as has been said previously, it would also be expected that any economy gains would most like have a performance price as well. Conversely, if you were tuning for power, I could see gaining proportionately more there due to the bias of the original factory tune, but then ONLY at the sacrifice of some economy.
one of the ways you make power in any car is to make it more efficient. you get power by making the intake get air more efficiently and the exhaust expell air more efficiently. so when you arent using the extra power you are running better milage
.02
i wont take offense to anything i understand where your coming from
but seriously, if there was another 25whp and better gas mileage available from these engine, I cannot for the life of me imagine that the manufacturer wouldn't have tweaked it out for themselves.
i would agree on the earlier engines, but this motor is a transition and seems to not have the time spent on it that the v35de and v37de had/have
When you said you wanted to get a tune to improve gas mileage, I didn't expect you would realize much if any there (certainly NOT 8 or 9 mpg) , as they already factory tune them with a distinct bias toward economy and emissions.
i dont see this engine as being anything close to tuned from the factory to be efficient especially given the stock a/f ratios (in the mid 11's at the end of the rpms)we were seeing in the first dyno pull
Additionally, and as has been said previously, it would also be expected that any economy gains would most like have a performance price as well. Conversely, if you were tuning for power, I could see gaining proportionately more there due to the bias of the original factory tune, but then ONLY at the sacrifice of some economy.
one of the ways you make power in any car is to make it more efficient. you get power by making the intake get air more efficiently and the exhaust expell air more efficiently. so when you arent using the extra power you are running better milage
.02
#32
03-19-2011, 11:34 PM
the guys that did mine have tuned and race alot of nissans. they are good with stock to heavily modded. and im friends with the owners.
#33
03-19-2011, 11:51 PM
Interesting timing, I just tuned my car (Osiris) today as well. I am pretty much stock (ztube-custom intake-axle back) so I was using today to 1. promote the shop, and 2. see what it could do. The Osiris has 5 maps to it as well and in the power map I net +14WHP. In the econo map (stay tuned for updates as it was just done a few hours ago) I expect to see a similar bump in milage from what you saw.
I didn't expect world changing numbers on a stock G but some of the side effects are outstanding. Sync-up of the throttle (no more ECU overrides on launch etc) and the smoothing of the A/F curves. Increased throttle response and a much more direct feel to my throttle inputs were nearly worth it alone.
Don't mean to make too much on your thread (and to compund it I'm a coupe
), just wanted to share another "stock G" tuned story and you had such great timing for me 
Next up, a few breather mods to really make the most of the power map
I didn't expect world changing numbers on a stock G but some of the side effects are outstanding. Sync-up of the throttle (no more ECU overrides on launch etc) and the smoothing of the A/F curves. Increased throttle response and a much more direct feel to my throttle inputs were nearly worth it alone.
Don't mean to make too much on your thread (and to compund it I'm a coupe
), just wanted to share another "stock G" tuned story and you had such great timing for me Next up, a few breather mods to really make the most of the power map
#34
03-20-2011, 12:10 AM
you get power by making the intake get air more efficiently and the exhaust expell air more efficiently. so when you arent using the extra power you are running better milage
the gains where over the entire rpm band, and we had soo much fuel to pull. below 3700 we pulled at least a full 2 points in the afr. which is where the car is driven and with that much fuel taken out we had no problem gaining milage.
And as far as being so rich at the top end, that's surprising too, as I've always heard tuners talk about how lean the factory sets them up.
If this is all as you say, it just amazes me. DO you have before and after dyno printouts? I'd love to see them posted here for the benefit of all. Thanks
#36
03-20-2011, 07:46 AM
Interesting timing, I just tuned my car (Osiris) today as well. I am pretty much stock (ztube-custom intake-axle back) so I was using today to 1. promote the shop, and 2. see what it could do. The Osiris has 5 maps to it as well and in the power map I net +14WHP. In the econo map (stay tuned for updates as it was just done a few hours ago) I expect to see a similar bump in milage from what you saw.
I didn't expect world changing numbers on a stock G but some of the side effects are outstanding. Sync-up of the throttle (no more ECU overrides on launch etc) and the smoothing of the A/F curves. Increased throttle response and a much more direct feel to my throttle inputs were nearly worth it alone.
Don't mean to make too much on your thread (and to compund it I'm a coupe ), just wanted to share another "stock G" tuned story and you had such great timing for me
Next up, a few breather mods to really make the most of the power map
I didn't expect world changing numbers on a stock G but some of the side effects are outstanding. Sync-up of the throttle (no more ECU overrides on launch etc) and the smoothing of the A/F curves. Increased throttle response and a much more direct feel to my throttle inputs were nearly worth it alone.
Don't mean to make too much on your thread (and to compund it I'm a coupe
), just wanted to share another "stock G" tuned story and you had such great timing for me Next up, a few breather mods to really make the most of the power map
#37
03-20-2011, 07:52 AM
But didn't you say you were bone stock, no intake or exhaust mods? Even so, the stock intake and exhaust on these cars are pretty darn efficient. You've got to spend a awful lot to gain even a little.
i was just making a point to how cars gain power, i just did the same thing with the computer. i made the car more powerful by maing it more efficient
And as far as being so rich at the top end, that's surprising too, as I've always heard tuners talk about how lean the factory sets them up.
every car is different. mine was really rich up, actually it was really rich all over
If this is all as you say, it just amazes me. DO you have before and after dyno printouts? I'd love to see them posted here for the benefit of all. Thanks
i was just making a point to how cars gain power, i just did the same thing with the computer. i made the car more powerful by maing it more efficient
And as far as being so rich at the top end, that's surprising too, as I've always heard tuners talk about how lean the factory sets them up.
every car is different. mine was really rich up, actually it was really rich all over
If this is all as you say, it just amazes me. DO you have before and after dyno printouts? I'd love to see them posted here for the benefit of all. Thanks
#41
03-20-2011, 02:55 PM
#44
03-25-2011, 11:55 PM
