hauls ass at night, slow during the day?
#1
Full Member
Thread Starter
hauls *** at night, slow during the day?
its a 87 s4 turbo 2
running 9psi of boost, walbro fuel pump, thats it for engine related mods.
so for some reason when i step on it at night it flys, it pulls really well, but during the day it doesnt have that power like it should.
now I wonder with the walbro during the day its sending more fuel b/c its getting more voltage than it does at night with everything on(lights, music with subs) and leaning it out.
any other possibilities?
running 9psi of boost, walbro fuel pump, thats it for engine related mods.
so for some reason when i step on it at night it flys, it pulls really well, but during the day it doesnt have that power like it should.
now I wonder with the walbro during the day its sending more fuel b/c its getting more voltage than it does at night with everything on(lights, music with subs) and leaning it out.
any other possibilities?
#3
Full Member
Thread Starter
yeah but the difference...is well...night and day..lol.
stock wiring.
i mean even my sr s13 wasnt like that, it could be hot as hell and still have power.
stock wiring.
i mean even my sr s13 wasnt like that, it could be hot as hell and still have power.
Last edited by Claytons91; 07-16-13 at 10:21 PM.
#4
Rotary Power
iTrader: (15)
idk , havent boosted mine yet so I can't tell ya im still on break in
but if you're running lean its not a good thing.
have you upgraded anything besides the fuel pump as far as fuel system/ecu?
if you're leaning out whether from loss of voltage and/or from boost creep you'll want to find out.
I'm not sure how but you should test voltage on your fuel pump under load and see if its where it should be.
personally Im not running subs or anything because I know the stock s4 alternator is rather weak.
Rotary > Pistons
but if you're running lean its not a good thing.
have you upgraded anything besides the fuel pump as far as fuel system/ecu?
if you're leaning out whether from loss of voltage and/or from boost creep you'll want to find out.
I'm not sure how but you should test voltage on your fuel pump under load and see if its where it should be.
personally Im not running subs or anything because I know the stock s4 alternator is rather weak.
Rotary > Pistons
#5
Full Member
Thread Starter
its not really "leaning out" but i'm thinking b/c of the added pressure of the fuel pump its lowered due to the drop in voltage, but i'm going to drive my car during the day with my lights and **** on and see what happens. I just think its running rich to begin with.
Trending Topics
#8
MECP Certified Installer
#12
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 30,829
Received 2,597 Likes
on
1,845 Posts
#16
Sharp Claws
iTrader: (30)
if you're concerned about fuel you should be testing things.
get or borrow a wideband and monitor AFRs in the evening and during the day and compare. a wideband should be on every turbo owner's requirements list. even if you have no way of making fuel adjustments it will still show you the health of your fuel and engine management systems.
get or borrow a wideband and monitor AFRs in the evening and during the day and compare. a wideband should be on every turbo owner's requirements list. even if you have no way of making fuel adjustments it will still show you the health of your fuel and engine management systems.
#17
Rotary Power
iTrader: (15)
if you're concerned about fuel you should be testing things.
get or borrow a wideband and monitor AFRs in the evening and during the day and compare. a wideband should be on every turbo owner's requirements list. even if you have no way of making fuel adjustments it will still show you the health of your fuel and engine management systems.
get or borrow a wideband and monitor AFRs in the evening and during the day and compare. a wideband should be on every turbo owner's requirements list. even if you have no way of making fuel adjustments it will still show you the health of your fuel and engine management systems.
I want to get one of these for my car.
Turbo cars require much more special care and.attention to last
Rotary > Pistons
#18
Full Member
Thread Starter
yeah its def on my list, I am going to rebuild first, looking around for kits and prices, also i think ive fixed it, took off the UIM and cleaned the grounds with some sand paper and its running alot better in the upper range. so i think it was an issue with my secondaries.
Thread
Thread Starter
Forum
Replies
Last Post
Jeff20B
1st Generation Specific (1979-1985)
73
09-16-18 07:16 PM