Exhaust Advice - R32 Gtr - Twins

[R31Nismoid]

Including Nisomid? Who just SAID 5 MINUTES AGO it makes absolutely FA difference both top end and response, so the placebo of the better exhaust sound has gotten the better of u .

I've known people to revert back to smaller front pipes on sr20 to get better response to response for drifting so I assumed dump pipe/s would be the same.

And people said when they put on a bigger exhaust they lost some low end response but made up for it in top end power. So If u think more free flowing the better, then why don't u put on a 5 or 6" exhaust" ? you'll be the fastest car on the dyno in the world then

That's not what i said at all.

What i said is - on the topic at hand - 330rwkw/GT-SS/PULP - there was no discernible difference. I also said i did not lose any bottom end. Which you conveniently ignored for some reason.

E85 you might need to go larger, you might not, but you've gotta weigh up the costs to justify and for most - it wouldn't be viable over the setup the OP already has unless he was chasing every last iota of it (but then doing cams & head gasket was kinda a non-required spend already, so guessing money to burn there)

[GTSBoy]

Disco Pumpkin isn't even right from a theoretical point of view. There is absolutely nothing to suggest that bigger dumps would cost response. To suggest so is just daft.

Bigger dumps (and bigger everywhere in the exhaust) means less back pressure on the turbine at absolutely any operating condition. That then means that there is a possible greater pressure drop across the turbine when means you can spin it up faster. If nothing else, then the reduced back pressure just reports all the way across the turbine (so pressure drop across the turbine remains the same) and then you have lower exhaust manifold pressure. At the very least there is nothing to suggest that response should be negatively affected and there are at least a couple of ways that either the turbo or the engine itself would be happier about the situation and possibly give better response.

Edited June 5, 2013 by GTSBoy

[D_I_F]

He makes 475kw out of low mount turbos and makes power pretty much from idle, so I think he has a bit of an idea about an exhaust that works!

↑↑↑ THIS! Piggaz car is faarkin mental in everyway the setup is nothing short of amazing! So I suggest a lil more research pumpkinhead Piggaz knows his shit! Clearly you dont!

I think there's a good reason why his name is pumpkin. Sums it up doesn't it.

Thread does provide good lols

[SiR_RB]

2.5" front pipes and 3" cat back is fine !

[XKLABA]

r32 -r33-r34 dump pipe are all different, the r32 one are crap, the r33 ones are a massive improvement and the r34 ones are improved again, if you are looking for a budget upgrade then the r34 ones would be my pick for your setup with 2.75 into 3.5 front pipes, 3.5 cat and catback

the reduction of back pressure from the turbo outlet creates a bigger pressure difference between manifold and exhaust this inturn forces the exhaust gases through the turbo at greater speeds which means the turbine will accelerate much faster increasing response ( just a different way of saying what GTSboy has previously said )

I use CES split dump pipes on both my cars and I swear by them, the problem with split dumps is if they aren't made right they can cause issues where the wastegate gases rejoin the main flow and create turbulence and inturn backpressure, if made right they are the best setup IMO and my 32 is proof of that, as for bellmouth dumps they are very hard to get wrong and give alot more consistency form one brand to another

I have had HKS dump pipes and very much dislike them and the Xforce ones are a cheap copy, I went from stock R34 dumps to HKS dump and that was a small step backwards, I then replaced them with the CES comp series ones and that was a massive improvement over both, that was on a stock 2.6 with type R poncams and -7s

[sultanaz]

Thanks guys !! great input

Yeah ill keep my exhaust

I didn't really want to get rid of it neway, Im all about responsive power... I believe thats gna crack my 10.99
std turbos and std ecu i did 11.8... hoping for a 10 after this.


JEM said my exhaust will be fine .. Ill save my money.

The exhaust is HKS Dumps, HKS Fronts, Metallic 100cell by Hakan and custom catback from Hakan. @ Performance exhaust centre. I like the note its a true note... Oval Muffler.

Edited June 5, 2013 by sultanaz

[sultanaz]

That's not what i said at all.

What i said is - on the topic at hand - 330rwkw/GT-SS/PULP - there was no discernible difference. I also said i did not lose any bottom end. Which you conveniently ignored for some reason.

E85 you might need to go larger, you might not, but you've gotta weigh up the costs to justify and for most - it wouldn't be viable over the setup the OP already has unless he was chasing every last iota of it (but then doing cams & head gasket was kinda a non-required spend already, so guessing money to burn there)

Yeah i know cams & headgasket wasnt required but at the same time im pulling this head off with my mate. So im not gna be spending thousands in labour.

I know it probably wont pop the head with the arp studs but my weekend gtr takes drives as far as nowra so the more reliability i can get the better i say.

Cams was recommended by Jem and crd so i went with it. thanks for your helpful posts too mate.

[discoPumpkin]

Disco Pumpkin isn't even right from a theoretical point of view. There is absolutely nothing to suggest that bigger dumps would cost response. To suggest so is just daft.

Bigger dumps (and bigger everywhere in the exhaust) means less back pressure on the turbine at absolutely any operating condition. That then means that there is a possible greater pressure drop across the turbine when means you can spin it up faster. If nothing else, then the reduced back pressure just reports all the way across the turbine (so pressure drop across the turbine remains the same) and then you have lower exhaust manifold pressure. At the very least there is nothing to suggest that response should be negatively affected and there are at least a couple of ways that either the turbo or the engine itself would be happier about the situation and possibly give better response.

Is this guy 4 real? So why u don't have a 6 inch exhaust then? that's the million dollar question on everyones mind because according to your theory absolutely no backpressure is the key to HP and at the same time you don't loose any response, omg omg, I'm calling my tuner tomorrow to get him to put the worlds biggest exhaust on.

So tell me then whats stopped u then I wonder from putting on a 6 inch exhaust like u say considering how much extra hp you'll gain from all this "no backpressure" wizardry

Yeah i know cams & headgasket wasnt required but at the same time im pulling this head off with my mate. So im not gna be spending thousands in labour.

.

But instead you'll be spending thousands on cam shafts, cam gears, springs and headgasket for your "weekend GTR"- ok cool. Might I ask how many km's this 20 year old beast has accumulated?

[GTSBoy]

You are a complete f**k knuckle.

Is this guy 4 real? So why u don't have a 6 inch exhaust then? that's the million dollar question on everyones mind because according to your theory absolutely no backpressure is the key to HP and at the same time you don't loose any response, omg omg, I'm calling my tuner tomorrow to get him to put the worlds biggest exhaust on.

So tell me then whats stopped u then I wonder from putting on a 6 inch exhaust like u say considering how much extra hp you'll gain from all this "no backpressure" wizardry

[scotty nm35]

Lol.

Besides a 6 inch exhaust being completely impractical and dragging on the road, you reach a point of diminishing returns, dependant on your power goals. It also gets exponentially harder to quieten the exhaust to a reasonable level.

Some exhausts, even though the pipe size is large, don't flow well. Just because you have a 3.5 inch system it doesn't mean it will flow 350-400kw. That is a best case scenario and relies on the exhaust being well designed and internally smooth, with no restrictions as found inside most Jap mufflers.

In my testing, the bigger the dump the better. It allows more air to flow which makes more power, and response improves, but it needs to be well designed to get those gains, the rest is up to the tuner...

[Piggaz]

What would you recommend for this guy, Disco? Exhaust ports back...

[Missileman]

tin roof rusted

[discoPumpkin]

you reach a point of diminishing returns, dependant on your power goals.

Some exhausts, even though the pipe size is large, don't flow well. Just because you have a 3.5 inch system it doesn't mean it will flow 350-400kw.

That's my point exactly, is that everyone these kids come along and they autmotacially think bigger the better or more the better and forgetting diminishing returns. Generally when something goes bigger u loose in other areas, that's why stock turbos best for response, go any bigger and u loose response. Go bigger cams and u loose response again unless u got say HKS v cam.

Like I said I thought i'm happy to accept that bigger dump pipes don't loose bottom end power, I just assumed this because I know guys who were putting on smaller front pipes to get more response and torque down low. Anyway people can do what they wana do, if they wana go spend thousands then by all means be my guest, I know I wont loose any sleep over being in debt to a car.

What would you recommend for this guy, Disco? Exhaust ports back...

1. I would of lol'd if it was funny and 2. If it made any sense?!#!

[Missileman]

10 mins of crap

[Missileman]

I brushed

and I brushed

And I brushed and Brushed...

Edited June 5, 2013 by Missileman

[discoPumpkin]

and in the time it took u to read and reply nothing, an opinion of your own could of actually helped OP... lol it's not often a troll admits he's one

[Piggaz]

1. I would of lol'd if it was funny and 2. If it made any sense?!#!

What on earth are you on about mate? I'm asking you, seeing that I'm obviously wrong in your eyes, what exhaust setup would you recommend for the OP?

[33GTRV]

Sigh. Ok discodickhead. Please go search a little subject involving pressure difference between exhaust manifold and inlet manifold. Then, after you get your puny brain around that, search the next subject. Exhaust scavenge, velocity and pressure balance vs flow dynamic properties of hot gas. There is a reason the most obvious of all machines, trucks, use large bore exhausts that are short, smooth and free flowing. I know that in most cases, the turbocharger is designed specifically for a particular engine capacity and configuration as not having a responsive boost control method on the exhaust housing may blow your mind, but the theory is exactly the same. The pressure difference between the inlet and exhaust manifolds need to be different, the less pressure in the exhaust manifold, the faster the turbocharger can compress, therefore fill the cylinder and in turn, increasing performance and most importantly, response. The more air you can get in, the more air you can burn and get out. Next subject will really rattle you. Volumetric efficiency. Actually, fcuk it. Your a deadset spastic. Just google shart. That's about what your good for.

[gtr jet]

I have had HKS dump pipes and very much dislike them and the Xforce ones are a cheap copy, I went from stock R34 dumps to HKS dump and that was a small step backwards, I then replaced them with the CES comp series ones and that was a massive improvement over both, that was on a stock 2.6 with type R poncams and -7s

What difference did you notice exactly going from the HKS dumps to R34 one's?

discoPumkin, you might want to do a little more research before you keep rambling on.

What Piggaz is trying to say is what exhaust setup would you recommend for the OP straight off the head? If you had to pick a manifold and everything.

[discoPumpkin]

I seriously think I've had smarter farts than you have had thoughts in your entire pointless existence in this world.

Hugs and kisses, Allan

OMG it's Allan from the hangover, it all makes sense now I had an inkling that u were retarted but now my fears have been confirmed. Mr 1 man wolfpack please go back to workin on mums Barina and leave us alone, geez u been on here for 7 years and not even a mod or a sponsor so your not getting any income, your posts are all in vein

What would you recommend for this guy, Disco? Exhaust ports back...

standard many, 34 or CES dumps and 3" dumps back with a decat if possible

Remember in the other thread I said 3.5" cat back was perfect which is what u have, so i'm not saying your wrong. I'm saying Its not worth him going to 3.5'' or 4" when he already has the 3". Some people need to do more research on MONEY SPENT vs GAINS coz sometimes it gets beyond ridiculous some of the things people wana do say for instance if it's just a street car. A guy know put it to me like this "In all the money I've spent on my 32 GTR I could have easily brought a 34 GTR". I saw another guy selling his 33 GTR say he had spent 70K on it..

Some people can get a bit to excited I think and regret later, so that's what I said do ya research on whats worth it and whats not and weight that up with your purpose ie street, drift, drag etc. Piggaz apart from selecting the wrong turbos and exhaust from the start, but after doing your homework I gota admit great results in the end so well done, dunno how much all that shenanigans cost but