Installing A 3" Front/pump Pipe And 3" Cat Will I Feel The Difference ?

[mad082]

just get one of the just jap or xforce bell mouth ones.

[maddowse]

xforce thanks i have a starting point now tanks again

[Galois]

so was that the cause of your boosting mate? if you add the dump/front will you be boosting too much more for the turbo?

cheers

[Ultimategtr]

The main thing one would notice is the sound, esp if you are changing the front/dump pipe to something decent.

I found mine had more of a "growl" when I put my tomei dump/front on.

Kick in the pants wise - Not so much difference.

[Hanaldo]

thankyou mad802

thats what i wanted to know

it just shits me when people say get a different one but wont specify

how do i know if i go get a bellmouth one and post it on here someone will then say

ohh no do get that brand thats crap ,

i make a promiss to you all from now on if someone just jumps in to a thred iv started and just writes " do a search "

im going to follow you arround to ecery thread you go to and any time you ask a question i will reply "SEARCH F WIT"

and see how you like it .

Lol dude, settle down. Why do you want someone to be specific? Some people here will say go for this brand, some people will say no go for that brand. Are you honestly just going to go out and buy the first exhaust someone tells you to just because it is their opinion? Do your own research and come to your own conclusions. If you find something you think might be good, do a bit of research, and if you still questions THEN post. There is an absolute ton of threads here about ebay exhausts, jap brand exhausts, etc.

Check out the dyno threads and see what exhausts people are getting good numbers with. Those are actually proven on the dyno, not some guy on ebay claiming it has been proven on the dyno. I used to think split dump pipes were my best option, after a little bit of a search i now know otherwise, i never posted a single thread about it.

But for the sake of this thread, i'll throw in my 2c. I have a 3" bellmouth dump made by AGP, it is identical to the one on JustJap. I'm very happy with it. Now go check out the dyno threads and see if it meets your needs.

[maddowse]

Lol dude, settle down. Why do you want someone to be specific? Some people here will say go for this brand, some people will say no go for that brand. Are you honestly just going to go out and buy the first exhaust someone tells you to just because it is their opinion? Do your own research and come to your own conclusions. If you find something you think might be good, do a bit of research, and if you still questions THEN post. There is an absolute ton of threads here about ebay exhausts, jap brand exhausts, etc.

Check out the dyno threads and see what exhausts people are getting good numbers with. Those are actually proven on the dyno, not some guy on ebay claiming it has been proven on the dyno. I used to think split dump pipes were my best option, after a little bit of a search i now know otherwise, i never posted a single thread about it.

But for the sake of this thread, i'll throw in my 2c. I have a 3" bellmouth dump made by AGP, it is identical to the one on JustJap. I'm very happy with it. Now go check out the dyno threads and see if it meets your needs.

thanks why i wanted it to be spacific is that some one said dont go for splits i just wanted to know why wether its the trying to fit them or that they actualy do more harm than good flow wise ,

i asked about the just jap because thats my second preference but wanted to know if anyone has used it with good results ,

but thanks for your post ,

also iv looked at the small split dump pipes but dont see the sence in them as they only split the gasses for a short distance,

[maddowse]

The main thing one would notice is the sound, esp if you are changing the front/dump pipe to something decent.

I found mine had more of a "growl" when I put my tomei dump/front on.

Kick in the pants wise - Not so much difference.

yeah the sound and better flow was what im after as the power side of it im not fussed at this stage but as i said in the opening post that other post had me thinking lol.

oh and Galois yeah turnes out that the actuator is from another nissan but its not an r33 and the guy that looked at it doesnt know what its off just that its set to 12 psi , i dont know why im reading at 12.5 though lol could be the gauge or caould be a leak but im getting to changing the hoses soon.

also a few people have said they high flowed there exhaust and it didnt raise there boost at all but i guess ill find out when i fit the exhaust lol.

[tridentt150v]

A split dump is OK, no different to a bell mouth really. Heaps of guys are running with split dumps all over the world. The difference in performance between a split dump and a bell mouth is as close to f#ck all as to not count and honestly could go either way.

The biggest problem you may repeat may have with a split dump is the wastegate getting caught on the splitter flap or the piping, and this could happen to a bell mouth but is less likely. And careful use of a grinder will usually fix it - just means you have to remove and fix.

The only other problem you might have is cheaper thin metal poorly made units will fracture and crack around the welds over time - but this is true for both types.

Personally I wouldn't lose any sleep over the split vs bell debate, I'd just make sure that whichever one you decide on is a good qual unit that bolts up and sits right.

[Galois]

ahh you've given me an idea, i might see if i can see what mines set to, means i have to take the bastard off again, hope its easier the second time or my nuckles will never recover! haha

just want to add this in, maddowse has been looking at front/dump pipes for several months at least. i'm still learning so much about skylines and cars in general every week and when it comes to brands and prices and what's a waste in money and what's any good it becomes a pretty steep learning curve

just a theoretical question: would the split be better for response as it keeps pressure lower (well either lower or the same) after the exhaust turbine which means the pressure difference when you suddenly plant the throttle will be higher and the turbine will spin faster? or is this entirely negligible?

Edited June 9, 2010 by Galois

[tridentt150v]

just a theoretical question: would the split be better for response as it keeps pressure lower (well either lower or the same) after the exhaust turbine which means the pressure difference when you suddenly plant the throttle will be higher and the turbine will spin faster? or is this entirely negligible?

Better than what???

A standard system yes, a bell mouth no difference. This answer is based on the split dump and bell mouth both having sufficient cross sectional area to remove restriction. And that is the main thing, you have go bigger. Where the gases come back in is less important [as long as they come back in in a typical split dump front pipe fashion], and that is why a bell mouth works just like a split dump = they are both bigger in area than a standard system.

[Galois]

Better than what???

A standard system yes, a bell mouth no difference. This answer is based on the split dump and bell mouth both having sufficient cross sectional area to remove restriction. And that is the main thing, you have go bigger. Where the gases come back in is less important [as long as they come back in in a typical split dump front pipe fashion], and that is why a bell mouth works just like a split dump = they are both bigger in area than a standard system.

bell mouth vs split

i was comparing their only main difference: what happens to the exhaust gases when the wastegate opens. the bell mouth will have higher pressure on the exhaust side of the exhaust turbine right? since pressure effects will die off over distance and the split pipe moves that re-entering pressure further away from the exhaust turbine, the pressure on the exhaust side of the exhaust turbine will be lower on a split than a bell mouth right? im pretty sure thats right in theory (tho i am epically tired lol), but would it make any difference to response?

[Harey]

Make sure you get a tune asap to get the most out of it.

[R3N3]

ive heard of some people who had the split front pipe came accross over-boosting issues??

i wouldnt buy some of the stainless dump pipes off ebay, as they are quite thin and can crack easily.

it sounds like you are using a r32 actuator, as they are 12psi (i think). if your running your stock turbo i would take that actuator off and put the old one back on (sell the 12psi one as i think they are quite saught after??), as putting the zorst on, it will up your boost around 2psi. so 14ish psi on stock turbo wont last long. i say just go for the just jap 3" mild steel bellmouth dump/front pipe. hope i helped

http://justjap.com/store/product.php?produ...at=0&page=1

Edited June 9, 2010 by R3N3

[tridentt150v]

bell mouth vs split

i was comparing their only main difference: what happens to the exhaust gases when the wastegate opens. the bell mouth will have higher pressure on the exhaust side of the exhaust turbine right? since pressure effects will die off over distance and the split pipe moves that re-entering pressure further away from the exhaust turbine, the pressure on the exhaust side of the exhaust turbine will be lower on a split than a bell mouth right? im pretty sure thats right in theory (tho i am epically tired lol), but would it make any difference to response?

You are right, but the effect is split second and then everything equalises and assuming the CS Area's are the same then so is everything else, you would be hard pressed to feel any response effect in my opinion but I'll be honest and say that I have owned both systems and haven't tried to or noticed any difference. If you had an open pipe ie no cat back exhaust then the split dump could in theory be the better performer. But then you would be better off with a screamer pipe

[TUF250]

my 33 had a 3 inch system and 3 inchg cat on it when I bought the car. I just had a bellmouth type 3 inch pipe installed to complete the system. Nice honest gains, very worth while. Definately louder but not by a lot. The car feels like it has more torque, grunts less in high gears at slow speeds, it felt like it has been opened up a little, less restriction and now is done everything a little easier. feels stronger but not excessively different. still highly recommended

[R31Nismoid]

That's funny first people come in and bagg the pipe I wanna give and then have tithing to back them selves up with other that "search"!!!.

Fat lot of good this forum is , I u do a search all u get is slot of posts with people asking a question and never getting a straight answer . Thanks for ur sarcasim !!!

Well it was crap - I'm not going to put a rosy shine on a piece of shit product.

And you were told where to get them from:

Buy something from one of the SAU Traders.

[maddowse]

Well it was crap - I'm not going to put a rosy shine on a piece of shit product.

And you were told where to get them from:

ok i understand you may know what your talking about when you say its utter crap but what i mean is tell me wht its crap as i cant tell the difference ! do just say its crap and leave it at that , can you tell its crap steal by the color of the steal or did you zoom in and see that it has bad welds or something .

and yes you said were to get them from but wouldnt it be better to say "hey get this brand thats avalible from sellers on SAU do a search on this product and you will see most members prefer them"

well i might be just ne but thats how i would say it after all writing on fourums doesnt disd\play your emotions when u type so its easy to take someone thats helping you negativly by miss understanding what there saying

im sorry i took it the wrong way

[R31Nismoid]

Anyone's product is fine mate - whatever suits your budget.

SAU Traders are ALL Australian businesses that sell reasonable quality goods.

We don't let traders signup here that are typical poor quality/ebay only style businesses. They need to have a front door and a face so to speak

As for the quality of the other thing - just around the flange area is poor welding, and that "pipe" that sticks out... rather "wtf".

Also as with most internet/ebay style things - they seller has barely sold any examples at all, with a tiny user feedback/rating - this rings alarm bells right away.

[maddowse]

ok thanks for that .

i can find the just japs site on google but strugling to find it in here but i guess im typing the wrong thing into the search bar .

ill get there lol thanks for your help

[maddowse]

i tell you what ignor that last post lol i gave up on type it in the search bar and scrolled down on the main page !!! low and behold there it was

iv never scrolled down to the bottom i just use the search bar ,

sorry