dragonsking91

Hi, I have a ATLP V1 alone with stock pre-cats and Jpipe and i feels like i don't have any low end torque at all. I mean below 3k i barely can feel the car moving and most cars would take off before me. Am i bottleneck my car exhaust? Thank

Edited: I also have AEM CAI V2 and P2R TBS on my car as well.

TheChamp531

iTrader: (3)

Of course you are. Think about it.

Italiano

U will bottleneck until u get your catback on

boosted2000si

iTrader: (1)

I noticed even the car stock really kind of sucked on power down that low. I know when its really hot out here my car is like a pig trying to get going from stops.

dragonsking91

care to explain??
huh? my stock catback???
yeah same here the car feels like a freaking tank

Italiano

no aftermarket one..j_pipe is a bigger diameter...once u get a matching diameter it will not bottleneck

dragonsking91

dude i have ATLP V1 catback. I'm sorry if i didnt make it clear. I don't have ATLP v1 jpipe but planning to get a jpipe soon.

justnspace

iTrader: (1)

first off guise, The Jpipe was my only mod.
it actually INCREASES torque at 2k RPM.

so, how can you all say that there is a bottle neck; when there really isnt?

dragonsking91

crab-man what is the problem with me not having no low end torque? The car feel much worse than stock in my opinion.

Italiano

ok...i misunderstood u...no your not bottlenecking then....u have smaller piping going into larger piping...so no your not...what u are feeling is the release of the backpressure u used to have, which gives the impression of more torque....i did piece by piece so i understand what u are feeling...

Italiano

i misunderstood him...in his situation he isnt....in yours u are if u have a j-pipe going into a stock cat and exhaust justin...this happened to me...had the CAI and it pulled hard,after j-pipe loss that torquey feeling...got the full effect once i went with race pipe and base atlp exhaust....its even better now that i have high flow precats on

anx1300c

iTrader: (2)

I don't know, but I think people get these weird ideas in their head about "bottle necking". I feel it's a way over overstated "problem", especially when an aftermarket J pipe quells one of the greatest restrictions on these cars exhaust wise. The cat backs on these cars (and pretty much ALL oem cat backs) flow pretty damn well on modern cars. Sure, it helps to get the PCD's or HFC's after you've done the J pipe, but it's the sum of all the parts that defines the end result. If you add any single exhaust mod on its own, there's no reason you'd lose power in theory.

dragonsking91

My point is i have everything stock except the catback therefore i shouldn't feel the lack of torque im feeling now. You have the jpipe installed before the cat so in your case it was suppose to happened.

anx1300c

iTrader: (2)

No, it was not. All the J pipes increase torque.

DomGSR-T

iTrader: (1)

There's always a bottleneck effect, even on a j-pipe, it's a great idea but it still connect to the oem pipe (bottleneck) at least there's the cat delete to it so that's where the 4-6whp come from. The fake true dual from rv6 also has the bottleneck where the two pipes connects. So the only way to get rid of the bottleneck is a custom piping. Or an real X-pipe added to the fake true dual to become a true true dual Here's how mine is done:

http://s1108.photobucket.com/albums/...ual%20exhaust/

dragonsking91

Idk why then but i feel like my car lack low end torque than before when i didn't have my ATLP exhaust. I'll try to get a jpipe in the next month or so

Italiano

dude I told u^^^its because stock exhaust have backpressure...and when u go to a free flowing exhaust u relieve the pressure..giving a sense of lost low end..but u should def feel more topend..

DomGSR-T

iTrader: (1)

I lost low end power after the j-pipe install and 4whp peak. So like Italiano said backpressure lost leads to low end lost.

justnspace

iTrader: (1)

I dont understand.

the rv6 v3 Jpipe INCREASED torque ACROSS the power band


to make my point even more so.
I added RV6 V3 PCD's AFTER I did the Jpipe.

I gained torque across the power band.
EVEN at 2k RPM.


According to you;
if bottle necking were true...
because of my stock exhaust; I shouldnt have gained.

I do have dynos.

justnspace

iTrader: (1)

To the OP, because these people are confused; they think you have a problem with bottlenecking.
when in reality, you only have a cat back as your only mod.

hahah FUNNY.




your lack of low end; MAY be the effect of heat soak.
How hot has it been in your area?
does the car act differently in the mornings?

justnspace

iTrader: (1)

I believe this is the WINNER!!!!!

justnspace

iTrader: (1)

because i'm still thinking about this.


PCDs-->jpipe-->stock exhaust.
I'm going from no restriction 2.5 piping --> 2.25 piping.

but I gained at 2k RPM.


WHERE is my bottle neck?

Italiano

u still gain,but not to full potential across the powerband until u complete your exhaust.....O.P def confused everyone.....in his first post he says he has a j-pipe

BukvaMan

Your biggest problem as mentioned before is probably heat soak. And then from my experience the CAI and the Throttle Body SPacer. I had the same issue when it came to low end torque and just driving around the city... the car felt unresponsive and sluggish. Also dont forget, but hondas have the worse low end torque ive seen. I removed my intake and the TB spacer and put the stock air intake back in and gained back my low end torque. The car feels much lighter now. I do miss the sound of the intake tough!

I have Richie's HFC > V3-Jpipe > Comptech Exhaust. Im sure that i lost some low end torque there aswell. Maybe not but sure feels that way. I mostly notice it on highway and long trips, 5th gear automatic around 60 to 65 mph feels like its fighting for its life . While any other car ive driven accelerates with no effort whatsoever.

No wonder i want that corvette so bad talk about going from one extreme to another

Italiano

Hey Bulka u enjoying richies hfpc...put mine in a week ago...really woke up the TL...^^^

BukvaMan

to be honest with you, at first i went with the PCD, I had a hard time getting used to the smell and just couldnt live with it. The PCD had more gains for sure then the HFC but there was a very noticeable low end torque loss also. The top end felt really good. Since i dont push my car that much and mainly want it to be more alive and peppy it didnt work for me. So since it was a bitch taking the stock precats out i could only imagine putting them back in, so i opted for the HFC. The low end torque that vanished came back but the top end didnt feel as strong. Maybe because the power band is more linear now and I cant remember how stock was so cant really tell

If i didnt feel lazy doing it i would probably go back to stock precats, im sure my exhaust would sound deeper. Both PCD and HFC produce rasp. HFC not so much as PCD but still there.

Italiano

hmmm....i love them..not raspy at all....really complimented my other mods..theres like a 3hp difference between deletes and HF.....

BukvaMan

im not saying anything... as far as facts but it just felt that way...

Italiano

Well O.P...hope we have answered your questions.......

rockstar143

iTrader: (6)

when I bought the TL, I felt like I lost all my low end torque!

Just kidding, but if I'd been coming off a engine with torque I'm sure I'd have felt that way.
OP, I think you need to focus more on the heatsoak and even the battery (check out IHC's) thread than how big your pipes are

There is no way you remember that you didn't or did have more torque when you had your stock catback...it's just your expectations of the car that have changed.

If you're convinced you're right...slap the stock back and call it a day and put $700 bucks back in your pocket cause i'm certain another member would be glad to take the loss of torque!

DomGSR-T

iTrader: (1)

[quote=justnspace;13913347]I dont understand.

the rv6 v3 Jpipe INCREASED torque ACROSS the power band


to make my point even more so.
I added RV6 V3 PCD's AFTER I did the Jpipe.

I gained torque across the power band.
EVEN at 2k RPM.

[quote=justnspace;13913347]

I have done a same morning (1 hour interval) dyno runS of before and after the j-pipe and I lost power at low rpm. 2 1/4'' is too big for NA TL-S that could explain... and a j-pipe connected to the oem piping is nothing more than a cat delete when you think about it...

rockstar143

iTrader: (6)

Naw, it's a lot more than that. If you keep barking up the "restricting or bottlenecking my exhaust" thing...you're just spinning your wheels, so to speak.

PS, if you write in the quote, it eliminates the quote and just makes ugly jibberish.

DomGSR-T

iTrader: (1)

sorry about the quote things and I just spoke of my experiences on my car and results I got to help/guide readers of azine...

dragonsking91

Sorry if i have cause any confusion but i only have ATLP V1 catback and currently running on stock Jpipe. I will try and get a aftermarket Jpipe within a month or so. I live in florida so about 90ish this time. But i noticed that most cars would pull harder than i am at a dead stop unless i really floor it. When i get a Jpipe would this fix the low end torque i have right now?

rockstar143

iTrader: (6)

Dom, was just being a dick...you're doing just fine, man.
dragon...it's hot man, it kills our car...look into the ultimate cooling mod, some throttle body spacers, intake and your battery (seriously, look up that thread by I Hate Cars, buka can attest).

Adding Jpipe/PCD will change sound, potentially give you CEL's...not saying it's not worth it, but it's more of a commitment in multiple ways.

anx1300c

iTrader: (2)

You're getting your rasp from the RV6 V3 J pipe, not the HFC's. I have no rasp with them and I have the ATLP V1 J/race pipes. Italiano has the same set up as me with no rasp either.

dragonsking91

Ok I will look into that. here is the cooling mod thread. Just to get this straight all i have to do is remove the hose that connected from the "cooling TB in and cooling TB out" is that right?

https://acurazine.com/forums/3g-tl-performance-parts-modifications-112/crankcase-coolant-tb-bypass-modification-699978/