Unbolted Exhaust:gains Or No Gains

[ADDICTED2SPD]

Quick Question I Tried To Search This Over But None Found Just Wondering If I Unbolt My Exhaust Is There Possible Gains. I Ask This Because Over The Weekend Ill Be Headin Over To The Tracks To Run Against Some Of My Friends. Just Tryin To Squeeze Some Extra Ponies As I Can.

[GT 01]

Yes, you will gain some horsepower over the stock exhaust.

[ADDICTED2SPD]

Thanks Also Is It Louder Or Just As Loud As The Kazuma

[JOHN_B]

icyjaws 2000 / Celica GTS / 6 Speed / 2000 / Injen CAI, No Muffler 176.6 HP 127.2 TQ

http://www.newcelica.org/other/dyno/page.php

[ADDICTED2SPD]

Thanks For That Info Two One More Question Does Lift Seem To Pull Harder Without It Too

[mexicangts]

ok i dont know what that all means, in english was that a yes or a no?

muffler off good or bad.

[tonycortes]

Unbolted exhaust = More powerful lift for sure and better higher end, meaning the higher RPMs really put out power.. In my opinion I feel like I lost low end torque and running RICH (more fuel burning), but could be that I need POWERFC to tune

[JOHN_B]

Unbolted exhaust = More powerful lift for sure and better higher end, meaning the higher RPMs really put out power.. In my opinion I feel like I lost low end torque and running RICH (more fuel burning), but could be that I need POWERFC to tune


Indeed. When i had mine off, I had terrible MPG / Lost low end TQ. Now I have TPR exhaust and it kick ass......Try it..!

[ADDICTED2SPD]

Koo Think I Try It But Im Not Sure If Im Gonna Have It Off For Everyday Driving Bad Enough I Get ****ty Gas Milage As It Is. Still Researchin To Find The Best Exhaust. I Want Something Not Common Like The Trd Exhaust That Most People Seem To Have.i Was Thinking Trial Exhaust But Not Sure How It Sounds Or Gains Something Not Ricey.any Suggestions

[Nova_gts]

i ordered a kazuma yesterday... is it gonna have pretty much the same gains as none? i dont see how it would give u worse gas mileage tho? its not gonna affect how much gas the engine needs?

[importfreak8]

i have my muffler completely removed for daily driving. its really loud and my neighbors hate my guts. but power wise the top end is awesome. you will def. feel a gain up top. my gas mileage improved actually. maybe because i have the injen intake installed, and i unbolted the exhaust at the same time i did cai install.

[ADDICTED2SPD]

Ic Ic All I Have So Far Is Aem Intake So I Will See How This Goes Im Gonna Take It Off Tonite Wen I Get Home From Work.my Girlfriend Is Going To Have A Surprise Wen I Pick Her Up

[importfreak8]

Ic Ic All I Have So Far Is Aem Intake So I Will See How This Goes Im Gonna Take It Off Tonite Wen I Get Home From Work.my Girlfriend Is Going To Have A Surprise Wen I Pick Her Up

make sure you call up one of your weight lifting friends. those bolts are on there pretty damn tight. it took me and 2 other people to losen those damn bolts. then when my friend bought his gt and wanted his exhaust unbolted, i called my friend who has air tools and it made it alot easier. just a little fyi

[jarrettgt]

I just used pb blaster to get the bolts off along with an impact wrench!

[mexicangts]

wow your cars dont get dammaged wiht out the exhaust.... i seen a lot of ricers have their cars running wiht no exhaust and those things where loud, suposably messes up the cars i heard

[phaqgm]

wow your cars dont get dammaged wiht out the exhaust.... i seen a lot of ricers have their cars running wiht no exhaust and those things where loud, suposably messes up the cars i heard


Not having a muffler will not damage your engine one bit.

[Nova_gts]

How Come You Capitalize Every Single Word???

[LEDmod]

I actually gain little bit down low..... I saw it from my dyno sheet...

[ninegts]

How Come You Capitalize Every Single Word???

pwned by the all caps filter.

[gtspaul2zzge]

Removing the axle-back portion of the exhaust will also aid in weight savings. I think the stock piece is near 30lbs.

[tonycortes]

don't get confused people... I said I lost low end torque... But yes the mid and high gains are very good but too loud.. it will get annoying in time... Be careful though the heat from the exhaust MIGHT deform the plastics above it from where you unbolt... by the way i was able to unbolt my bolts without any special tools, just good old muscles and kickin! and i didnt even lift the car. i just crawled down there. :)

[ADDICTED2SPD]

last nite i took it off and daaamn that is loud but i did notice mid to high range power but down low still felt the same to me. went over to my parents house to take it off it wasnt really that difficult only problem now is i think i strip the bolts taking it off

[Kenbx84]

by the way i was able to unbolt my bolts without any special tools, just good old muscles and kickin! and i didnt even lift the car. i just crawled down there. :)

:werd:

My cars ass is so high i can crawl under there and unbolt the axel back portion in less than 10 mins...i heard you need to drive the car around for 2 days for the ECU to adjust to the unbolted exhaust before you see the full effects of the mod.

[tonycortes]

^^ i was told by a toyota tech at my dealership that it needs 30 miles in order for the ECU to tune... I was surprised they even knew about the auto adjusting ECU.. I HAVE A GOOD SMART DEALERSHIP :)

[BHam00GT-S]

i have my muffler completely removed for daily driving. its really loud and my neighbors hate my guts. but power wise the top end is awesome. you will def. feel a gain up top. my gas mileage improved actually. maybe because i have the injen intake installed, and i unbolted the exhaust at the same time i did cai install.


I have had mine removed for 2+ years. only prob is after a long while (maybe a year or more) the CEL came on for a catalytic sensor going off. not a p[roblem. according to my latest dyno, it started off a little lean, went stoich at 1k, got rich from 1k-3k, but was perfectly stoich until cutoff after that. But that is a normal a/f curve isn't it? As for gains, it will give better gains (in theory) than any exhaust including Kazuma. This is because the air just freeflows. Even with Kazuma, there's a little extra length for the airflow to travel. And as for the Trial muffler. I doubt it will sound ricey. I have the FI version waiting to be installed on my car, but Trial makes top quality products, all made for total performance. That, and the titanium is gorgeous. Check out my muffler pics in my thread in JDM style

[tonycortes]

^^ correction Kazuma is better than unbolted... Kazuma is a true cat back with the exception that it welds on and doesn't bolt on.. while Unbolting your exhaust is off the axle back.. Kazuma would give less restriction before the axle-back (it removes something, forgot what) and have heard that the length of piping helps with exhaust scavenging.. which unbolting our exhaust can't do. And just so you all know KAZUMA is louder than unbolted.

[tonycortes]

got rich from 1k-3k
I agree with you on this... i drive normal speeds and below 3k and my car tends to burn more fuel with the unbolted exhaust.. I think the ECU is giving a higher fuel ratio... sucks cause fuel prices are high.

[ADDICTED2SPD]

nice to know that unbolted is not louder than the kazuma i was heading towards that exhaust since all i want is performance but i was thinkin of all the tickets i might be getting. i think ill settle for the trial exhaust.i dont know the gains on it but sure does look sweet.anyone know the specs on it and btw what is the trialUSA website

[Kenbx84]

kazuma removes one resonator...but adds a smaller one right before the tip...kazuma may be better due to a bigger diameter piping...but not much...maybe 1-2 whp? maybe...but the big difference is u get a cool looking tip and u dont burn any plastic under your car.

[BHam00GT-S]

got rich from 1k-3k
I agree with you on this... i drive normal speeds and below 3k and my car tends to burn more fuel with the unbolted exhaust.. I think the ECU is giving a higher fuel ratio... sucks cause fuel prices are high.


I don't know if unbolting the exhaust did that. It's my impression that this is somewhat standard in our cars. For reference, it started out at ~15 (maybe a hair less) in all 3 runs. In my all-motor run, it went down gradually to 13 (stoich) by 2500-3k rpms. It remained along the 13 the rest of the way out. On my spray runs, from 1000-~2500 rpms it went rich (lowest point was 11. Then by about 4k, was at 12 and around 4600 or so went stoich at 13 for the rest of the run. This was the same occurance (maybe a small deviation here or there) for both nitrous runs. This info is just to show the A/F with the mods I have listed but unbolting the exhaust does not mess any of that up.

[ADDICTED2SPD]

so is it bad that its running rich beloW 3K?? any other problems that might occur now

[BHam00GT-S]

it's not bad. I have no engine management or anything. I'm pretty sure most all celicas have the lean to rich thing going on in low rpms. It's not damaging if that's what you're asking. If I had PFC I could even it out a lot which would be great but it runs fine how it is. Just food for thought: In my current setup, I ran pace for pace with a boosted ITR (maybe a GS-R but when boost is applied, the dinstinction between the two is somewhat lost. He was a guy who works at the shop I dyno'd at and he was really impressed. I also have killed a bunch of lesser cars without spraying (somewhat stock rx-8s, etc.) I tried to run an NSX the other night but he didn't do anything. The other day I figured out my power/weight ratio is better than a factory NSX, which leads me to believe it would have been a decent race, either way

[ADDICTED2SPD]

again i ask:trialusa website plz.

[tonycortes]

that's interesting BHam00GT-S.. good info. still wondering why there's more fuel consumption.. is it a POSSIBILITY there is enough heat from exhaust that could be affecting the fuel tank???

[importfreak8]

hmm, i didnt noitice any fuel differences and i shift noramly around 3-4k. depends on traffic. yes, the kazuma will give you a little more power but not much at all stated by ken. although i didnt think the kazuma would be louder than the unbolted exhaust. geez, thats got to be annoying as hell, since the unbolted exahust is annoying.

[BHam00GT-S]

that's interesting BHam00GT-S.. good info. still wondering why there's more fuel consumption.. is it a POSSIBILITY there is enough heat from exhaust that could be affecting the fuel tank???


I have not noticed any negative differences in fuel consumption. I also have a lot of other things to make the engine run more efficiently. I drove from Auburn AL to Orlando and only stopped for gas in gainesville. I'm not sure as to the distance it was, but I feel like I may have been able to go to Orlando w/out stopping for gas. Didn't wanna push my luck though. Another tidbit: Coming back from West Palm Beach for my cousins wedding I somehow squeezed almost 40mpg. This was basically just driving speed limit the whole way in 6th gear. Don't ask me how it happened. Now I average 350 or so to the gallon city driving. Only things I can think of to aid in all this are groundwires, pulley, etc. I'm pretty sure my mods are all listed i nmy sig

[BHam00GT-S]

^^D'oh! I mean ~350 miles to the tank not gallon. Whoops

[tonycortes]

Let me explain my situation more... I get worse milage (from what it looks like) in the city, but i get higher milage on freeway like you do. I could understand why milage has increased on the freeway since I'm in the midrange (where i noticed gains) and at a constant speed. The car's low end TORQUE is very noticably lower and since in the city, speeds are not constant and accelaration is needed consistently (especially from lower RPMs)..... i should be getting a small mpg loss. Does it sound logical or am i just crazy? and this is just my situation, i'm not saying it applies to everyone. Another thing to consider I have no intake installed. I'm in the process of making a BB Modded Intake. That should be affecting my MPG compares to yours.

[gameboi]

i get a CEL from time to time with the exhaust unbolted...does it mean anything major?

[BHam00GT-S]

Let me explain my situation more... I get worse milage (from what it looks like) in the city, but i get higher milage on freeway like you do. I could understand why milage has increased on the freeway since I'm in the midrange (where i noticed gains) and at a constant speed. The car's low end TORQUE is very noticably lower and since in the city, speeds are not constant and accelaration is needed consistently (especially from lower RPMs)..... i should be getting a small mpg loss. Does it sound logical or am i just crazy? and this is just my situation, i'm not saying it applies to everyone. Another thing to consider I have no intake installed. I'm in the process of making a BB Modded Intake. That should be affecting my MPG compares to yours.


Yeah that actually does make sense. For one, the parts in the powerband that are affected by the mod are making the engine run more efficiently. The low-end torque increase probably uses a little more gas in city driving. Also takinginto consideration stop&go traffic, etc. But I'm not 100% on this. If I were you, I'd go ahead and do the intake, and for some cheap mods that give more power the more mods you do, go AEM pulley and a groundwire kit. They will both make diffs in mpg, and maybe a little amt of power.

i get a CEL from time to time with the exhaust unbolted...does it mean anything major?


The CEL with the unbolted exhaust (for me anyway) is something to do with the cat. It's not a big problem. I'm just getting tired of it being on and having to second-guess if anything really is wrong with the car. Once I get my Trial muffler on, it should go away. But if in doubt, autozone does OBD-II checks for free

[tonycortes]

gameboi, get the CEL code checked out, it might be something you just need to ignore or it could be something other than the unbolting. Another option is to reset it by taking the EFI fuse (ECU fuse) out of your fuse box in the engine bay for a couple of seconds and hope it doesn't come back on.

BHam00GT-S, I do have the ground wiring and it makes a noticable difference in the idle and electrical stress and I actually was researching for a pulley today, good suggestion BHam00GT-S. However, I'm leaning towards the UR Alternator and Water Pump Pulley, since AEM is an underdrive pulley and I'm not looking to change the belt size or underdrive my alternator. I prefer to reduce just the rotational mass on those two pulleys. Other mods I have in mind are the bored out throttle body from the the other thread, porting the stock header, and an aftermarket radiator. (i noticed celicas have very hot engines, my chevy is always running a bit cooler) Hopefully next week with the BB modded intake I will see improvement.

[Kenbx84]

where do u guys get ur ground wires at? is there a ground wire kit?

[tonycortes]

^^ i got mine from team celica $30 shipped (or so), search the forums... or check the install guides it may be in there... Helps with electrical grounding that have effects on your idle, headlights dimming, any electrical stress which sometimes affects your engines performance

[ADDICTED2SPD]

Okay This Thing Is Gettin Annoying Attracting Ignorant Ricers Think Im Just Going To Put My Exhaust Back On Seem To Get Way Less Attention.plus Its Starting To Sound Ricey To Me.anyone Had This Problem?

[tonycortes]

^^ yes it gets annoying in time...

[ADDICTED2SPD]

and it does sound kinda ricey right...??? or is it just me

[lilslim22]

When you unbolt the exhaust and the car is lowered on sportline springs, will the part that is hanging scrape?

[LEDmod]

When you unbolt the exhaust and the car is lowered on sportline springs, will the part that is hanging scrape?

No... if you don't strap the exhaust it'll dangle and make noise when you fit bumps and stuff....
Push the pipe to the side so that exhaust at the axel isn't get blocked...