exhaust mod drives range indicator crazy
 

I have been running with the washers mod for the last 4 months and love the sound however, i have noticed that the mile range indicator under the led lights got allot less accurate. Before the washer mod it was somewhat accurate now it's way off. Sometimes goes down then up i can't rely on it anymore. My question is why does the exhaust leak cause this?

Because the new exhaust fumes affect your vision and judgement?

It's not the exhaust, it's the driver.

It doesn't. You're putting your foot in it more to hear your exhaust leak and that's why your range display is going nuts. If you drive the way you used to, it will behave like it used to. Coorelation does not equal causation.

did you add fuel? cause then, it goes up usually... then comes down later.

To be honest i feel like I'm driving the same and not faster to hear the exhaust. Can it be that since i lost bottom end power I'm giving more gas to compensate for the loss in torque?

No, there's no way the exhaust leak has any measurable effect on mpg.

It is purely your driving habits.

That is all.

When has that indicator ever been accurate? I recall jumping from 60ish down to 30 within 10 minutes.

i can still see the scratch.

It is very accurate if you have good throttle control, but that's the thing....you have to have good control.

Scratch? I don't know what you're talking about! :tup:

Really? When I turn off my car, it will say about 124 miles. A few hours later, turn it back on and its down to maybe 90. It just doesn't seem that accurate to me. I don't rely on it because gaugology-101 tells me not to trust it. I just fill up when I have about 3 dots left. Hasn't failed me yet!

Is the car cooling off enough to be back in the cold start enrichment part of the map? That would explain the difference.

I don't rely on mine since it's way off with larger than stock injectors. I just use the trip meter every time I fill up. When I was stock, though, the range indicator was fairly accurate.

Hmm could be. I need to start using the trip meter too. Good idea. :tiphat:

I have noticed the same thing, but it always jumps back up once I start moving again. I think it calculates the remaining distance based on driving habits of the last few minutes/miles or something to that effect. I have nothing to back that assertion up beyond what I have observed, but it seems to work along those lines. This seems to make it easy to manipulate by doing crazy throttle changes or a lot of stop/start, but for longer trips where you are moving at a more constant speed, it's pretty spot on.

I'm sure this is exactly what's happening.

Unless you put a bunch of washers in there it shouldn't make that much difference. My money is on the guys that are saying your driving habits changed.

I tried the washer trick but it was blowing hot gas on the wiring going to the wheel speed sensors (especially on the left side) so I took the washers out. Had some tees fabricated and installed at the muffler inlets. Also installed some turn downs on the branches (pointed slightly toward the front of the car). The hole for the tee branch is ~3/4" and works well to give me some feedback in the cabin without being too loud outside.

This couldn't possibly have happened. You're mistaken. ;)

I brought that very point up in one of the threads about the washer leak and one member ranted and raved at me at length that this was a nonissue, it couldn't happen, nothing bad could happen and I was being ridiculous.

I suppose it would have been easy enough to fix (small metal deflectors bolted to the flanges should do the trick) but I decided to go with a more permanent arrangement.

This is not something I would try on a classic car; too much CO.

you guys doing the washer mod are missing the intake side as well. you need to go poke a 2 inch hole in your intake filters. its only common knowledge you need to breath more air in since your letting more out with your washers.










































jkjk, buy a real exhaust.

In the filters? I thought it was supposed to be after the maf for more power.

:tup:

I placed 4 washers on each bolt. Can the hot gases hitting the wheel speed sensors be causing the range indicator to go crazy? I inspect the underbody of the car every so often and verify that the hot gases aren't melting any of wires and don't see any damage being done by this mod.

I'm not sure how the car computes range. I feel sure that tank level and consumption rate (injectors?) are used but don't know about speed. I'm not even sure how the car determines speed. Does it look at just one wheel (if so, which one?) or does it integrate all four? Info may be in FSM but I'm too lazy to look right now.

Exactly what symptoms are you lumping under "crazy"? The range will change depending on how you are driving the car. Drive harder and the range will drop; drive easy and the range will go up.

As I mentioned earlier, it should be easy to bolt some sheet metal deflectors onto the flange to direct flow away from vital parts.

I did the same with my car, no problems with down low. My gas milage went down when I first did it because I was gunning it a lot but now its exactly the same as it was before since I have gotten use to the exhaust.

I never believe the DTE thing since that was never accurate before and it won't be after mods.

The only mods that should effect the distance are injectors or maybe a drastic change in tire size.

Haha. We need a 'you are a **** but funny-rep' option. :bowrofl:

:icon18: High on CO?

LOL @ all you who need to rely on the DTE instead of the dots. When it gets down to two or three dots, I fill up. It’s that easy and guess what,,,,, there's next to zero chance I will ever run out of gas.

Never in my life have I heard of anyone creating an exhaust leak to make the exhaust sound better,,,, until I bought my 370 and started reading the forums. I think it's dumb, but it’s not my car so washer away. And as stated before; creating an exhaust leak post 02 sensor will have no measurable affects on HP/TQ. It's all in your head.

So you haven't been keeping up on the fuel starvation issue?

really?

its pretty common with muscle cars, subarus, cobalts, maximas, altimas, volvos, 350zs, ect.

i think the only group that doesnt do crap like that are honda guys(which is the exact opposite of what i would have thought XD)

I always go to the track with a full tank of gas (to be consistent). I highly doubt starvation is an issue under "normal" driving conditions.

Granted, this is the first import I have owned since my first car which was a GSLSE Rx7. I have been racing Mustangs (now a vette) for more than 20 years and not once have I heard anything about separating exhaust pipes using washers to make the exhaust louder. Especially in the Mustang/Camaro/Vette crowds. Doing so in one of these cars would sound like an embarrassing exhaust leak. Either buy an exhaust system or get a cutout. Damn, I feel old now. The fact of the matter is it’s your car. Do as you wish; what I think means absolutely nothing.

Many people have experienced it on the street.

Under normal driving conditions?

under normal "my car doesn't have a live axle so why the hell not" conditions

i have seen a few on mustangs, camaros, chargers/challengers, Pontiac G8, Trans am, Firebirds, ect.

i dont think the vette crowd would do that kind of stuff since they just have to pull a fuse to stop the butterfly valve from closing on their extra exhaust tips for more sound and i know for a fact that the viper crowd dont do that since their exhaust sounds beefy as hell stock

i know i only did the washer mod because my moms stock maxima has a better exhaust note than my Nismo 370z does stock(and that imo is really sad)

apparently taking long right turns will cause it

i have no idea it would cause it because i have taken long right turns to get on the highway at 40mph before and never once have i experienced fuel starvation, even with low fuel(1/4 tank)

I've fuel starved on the street. Clover-leaf off-ramp @ ~60-70. Was a little more aggressive than I'd normally drive on the street, but not ridiculous, no tire distress or anything. Starved sure as ****.

That's exactly why I did it. People are always criticizing this mod but it really makes the car sound nice.