just got my stock bottom end lsvtec turbo motor tuned and running around 15:1 afr @ crusing/part throttle. seems like its hogging more gas than when it was all motor, it was tuned around the same afr on part throttle as the turbo-setup when it was all motor. how lean can my turbo set-up be tuned on part throttle to run safely?

 

14.7 is just about perfect ( depending on who you ask ) While boosting you wanna be around 12.5-12 ( again, depending who you ask )

 

In cruise, 14-15 AFR should be good, EGT temps might get a little high so depends on what u and ur tuner want. 13s sound safe for me. Under full boost depends on what fuel you using. Pump gas I dont run more than 11.6 - .8 Race gas might get a little leaner. This also depends on timing. I dont run anything leaner than 11.6 and 25 degrees of timing just to be on the safe side.

 

I tuned my car 1 point leaner except for WOT

 

under very light throttle/cruise i tuned it to run around 15.5-16:1. 14.7:1 in most parts. if im easy on the throttle i can get over 30mpg easily.

 

I shoulda put my mpg too

I get 35 mpg city, b16 tranny

with a ls tranny, I got about 39mpg

 

14.7-15.0 cruising

aim for 11.5-11.8 using 93

12.5 using my custom mix

 

it may be a leaner mixture, but I bet its cruising in a higher column, using more fuel

 

x2

What trans is in this car? How far form the turbo is the Wideband sensor located? The a/r ratio is fine for part throttle. Make sure no exhaust leaks at all this will also throw leaner readings. no reason you can't get 30+ out of it though. if its getting horrible gas milage then something is up with it.

 

lean burn limit of a gas efi motor is 18-22:1, i run 18 19 cruising which is about the limit of the wideband. the tradeoff is emissions

 

direct injection now allows for as lean as 40:1 ... iirc

word?

 

yep but not stock on our fuel, what does iirc mean

 

iirc=if I recall correctly

interstate no boost/load...17.0

 

you shouldnt run really lean, it really heats things up and high egt's arent that great for anything

 

running it leaner at very light loads wont really hurt anything.

 

I'm running 17.5:1 (equiv.) up to 55kpa using E85. Getting about 22MPG with that lol. Not sure what I would risk on 93.

 

not nec true, no worries for such a light load. More heat means more power for cruising, its a good thing and the flame front goes super slow so u may need to add a lil timing for such lean afr's

 

stock GSR trans
no wide band, got readings of of dyno when doing part throttle tunning.
I need to check for leaks cause i do smell rich burn fuel.

 

wel i kinda calculated how much mpg i get and it seems like its about 25mpg if i push it.

my car was on E, so i pumped 20 bucks which is about 4.77 gallons, cause gas here is $4.19 per gallon, and i ended up with 110 miles. this is just cruzing in town and highway. I only floored on it 2 times in 2nd gear.

110 miles / 4.77 gallons = 23 mpg

this is still a gas hogger in my opinion. what do u guys think?

 

best way to calculate:

fill up - do not top off, set trip meter to 0, and drive
on next fill up make note of exact gallons filled - again do not top off
divide gallons used into miles driven

voila.

if possible use the same gas station and pump

 

whats a good radiator to use?
Im using a dual core stock 92-95 civic radiator and stock fan and im getting very high temperature reading, so i have to constantly have the fan on just to keep the temperature in check.

 

You can lean it out alot when cruising/light load. There is a threshold where its so lean the engine cannot sustain the speed requiring more load and more fuel. I usually tune my cars for 15-16:1 AFR part throttle but have experiemented as lean as 18:1 without driveability issues. You arent going to hurt anything under light load, worse case it just wont drive good.

 

That is exactly how it is.