lovey408

ok well since i got my car tuned wit the rebuild i notice my gas mileage is badddd... i have a 00 civic si b16 turbo. orignally had stock internals with 450cc injectors and my gas mileage wasnt that bad on 3 pounds of boost.. now i re-tuned it after i got new pistons 8.3:1, rods, sleeved, 6 pounds of boost and same 450cc injectors. tuner tuned it up to 7K rmp becuz i need bigger injectors. but my gas mileage is realllyy bad. im thinking if its tuned to 7K with 450cc now and its this bad.. wat will happen if i get bigger injectors and higher RPM? anyone knw if there culd be sumthn in particular that may be causing this? if i pour gas and drive say 50 miles and let the car run boost 3-4 times in 5th gear. my gas needle is already about half way down.

Running925

on average a 1.8 motor boosted gets between 20-25mpg with moderate playing around.

Your bored to a 2.0 with much lower compression, so your probably using more pedal to try & drive it normal, let alone getting into boost.

lovey408

yah thats true.. but i wudnt ever think of it being this low on gas mileage...i feel like im driving a v8 if not worse. is there any thing i can do to help out sum bit?

SOHCD16y8

With 9:1 compression on my 1.8 I get 25mpg with E85 with plenty of beating on it. I would guess its a tuning issue. You should be getting 25-30 pretty easily. 50 miles on half a tank is def not right.

carnot

there is definitely something wrong. are you sure you don't have a fuel leak somewhere? are your plugs fouling? how many gallons is a 1/2 tank on your car?

0project dc2

iTrader: (1)

who tuned your car and on what program/setup ?

Topdawgg

was it street tuned? or just WOT tuned? cause you will have garbage gas milage if it wasnt street tuned partial throttle

Dunc

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Topdawgg &raquo;</TD></TR><TR><TD CLASS="quote">was it street tuned? or just WOT tuned? cause you will have garbage gas milage if it wasnt street tuned partial throttle</TD></TR></TABLE>

Exactly. Good gas mileage and a very good street tune is not exactly the quickest or easiest thing to do.

As for my 84mm 9:1 motor, I get about 32mpg cruising on the highway around 80. I got about 38-40 cruising at 90ish two tanks ago which was pretty sweet haha.

lovey408

there isnt no fuel leak.. i have it tuned with hondata s200 on a dyno. i would expect to get atleast 25mpg. and i rarely step on the pedal. im usually just cruising around 75-80 in the freeway. i have to call my tuner and ask him wat it culd be

Mr HYDE

seriously does it matter? i mean did you plan on saving gas when u sleeved and boosted the motor? come on now.

93supercoupe

a b16 at 84mm isnt a 2.0, its got to be in the tune

Do u have a wideband at all times?

lovey408

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr HYDE &raquo;</TD></TR><TR><TD CLASS="quote">seriously does it matter? i mean did you plan on saving gas when u sleeved and boosted the motor? come on now.</TD></TR></TABLE>

um ya it does matter to some point.. i dnt plan on getting more mileage of course but i wuld want some decent mileage.. and it also matters becuz it culd be something wrong that culd cause damage.

i have a air fuel ratio which is blah! but want to get a wideband one by aem

integraRS-T

if u get 50miles on a half a tank its def. the tune if u dont have a gas leak

lovey408

i just called the shop and he said i shuld be getting least 16-20 mpg. is there anythin i can maintence to see if it solves the problem? imma replace the spark plugs over the weekend as well so maybe i can check other stuff?

0project dc2

iTrader: (1)

who tuned it ?

integraRS-T

get it tunned some place else and u shuld be seeing 20-25mpg if nothings wrong wit ur car

lovey408

tech3 in san jose.. ryan tuned it.. this is the second time he tuned it and from wat i hear and experiance his tunes are greatt! i beleive you^^ knw him dnt u? i was tellin him imma get spoolin performance manifold and IC piping and he was like yeah that guy has good work.

purpleh22

Have your tuner pull up your Air/Fuel ratio table (AFR) on the Hondata S200. Check to see if you are running any richer than 11.5 when in boost. Check your partial throttle AFRs to make sure they are not over rich.

lovey408

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by purpleh22 &raquo;</TD></TR><TR><TD CLASS="quote">Have your tuner pull up your Air/Fuel ratio table (AFR) on the Hondata S200. Check to see if you are running any richer than 11.5 when in boost. Check your partial throttle AFRs to make sure they are not over rich. </TD></TR></TABLE>

im going to get it re-tuned with bigger injectors so im going to try to do that asap so maybe he can fix anythin that culd of went bad? also... since its tuned and im going to be puttin bigger injectors, exactly how much more tune do i need? shuld i tell him 1 hour of tune or 2 like normal?

Jay_Sensing

You can't tune fuel mileage on a dyno man. All of my hondas usually get around 30-35 mpg. It takes a couple of hours on the street just driving normally to get it right.


And I don't really care what you have for a turbo, you are not running out of fuel at 7k on 6 lbs of boost with 450's. Any turbo large enough to make that kind of power is going to be so far below it's efficiency range at 6 lbs it's going to be a restriction.

lovey408

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jay_Sensing &raquo;</TD></TR><TR><TD CLASS="quote">You can't tune fuel mileage on a dyno man. All of my hondas usually get around 30-35 mpg. It takes a couple of hours on the street just driving normally to get it right.


And I don't really care what you have for a turbo, you are not running out of fuel at 7k on 6 lbs of boost with 450's. Any turbo large enough to make that kind of power is going to be so far below it's efficiency range at 6 lbs it's going to be a restriction.

</TD></TR></TABLE>


wat do u mean im not running out of fuel? my car is tuned at 7K rpm with 450cc injectors at 6 pounds of boost and i have bad gas mileage like krazy.

cua0

i think your problem is that you and your tuner are both smoking from the same pipe.

lovey408

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cua0 &raquo;</TD></TR><TR><TD CLASS="quote">i think your problem is that you and your tuner are both smoking from the same pipe.</TD></TR></TABLE>

your cool!

cua0

yes i am, and you're a flaming retard, we don't really need to point out the obvious do we?

lovey408

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cua0 &raquo;</TD></TR><TR><TD CLASS="quote">yes i am, and you're a flaming retard, we don't really need to point out the obvious do we?
</TD></TR></TABLE>


yeah and ur some kind of online gangster who feels cool talking **** over honda-tech aint you. if u dnt have anythin helpful to say why dnt u gtfo this forum. acting hard over the internet doesnt really make u any bigger of a man