Jump to content
SAU Community

R34 Basic Upgrade Questions

wipe

By wipe,
in Engines & Forced Induction

 Share

Recommended Posts

wipe Apprentice

wipe

Posted
Posted

hi all,

ive had an R34 25gt for about a year now

so far ive only got a cat back 2.5" exhaust with a cannon muffler

i am curious to know what power is gained or lost through this modification as i have seen people say that you gain power and others have said that you lose power.

i would also like to know what i could do to increase shift speed as it is semi-automatic and at times it is rather slow with its gear changes.

thanks

Link to comment
https://www.sau.com.au/forums/topic/176368-r34-basic-upgrade-questions/
Share on other sites
HackerX Community Regular

HackerX

Posted
Posted

I doubt you'd lose power with just the cat back, but you won't gain much either. Better off finishing the exhaust off with extractors etc.

For the auto, do the same thing the turbo 34's do and get the valve body upgrade (you'll have to search it, there's a few threads around in the transmission section)

GTS4WD Grand Master

GTS4WD

Posted
Posted

People loose power because they go spastic on exhaut sizes. This increase of size creates a loss of back preassure.

i.e.. Now this will most likely be a dodgy explination.. but ill give it a go:

If you have a small exhaust.. the exhaust flow is restricted.. and there is too much volume of gas for the exhaust diameter.. causing it to slow down..

If your exhaust is the right size.. the gas will flow freely at a very rapid poit as it has reached it a point where everything flows at max velocity. Essentially.. the gass proppels and makes it self go faster through the exhaust. It accumilates speed throughout the exhaust and exists the car quickly, and effortlessly. If this is done correctly.. and at an optimum level.. GREAT gains are to be made (have heard of 25 dyno proved KW made by a cat back.. hi flow cat.. Headers and down pipe)

If the exhaust is too big.. the gass kinda just lingers there.. dowsnt know what to do.. and has a slow rate. Hence.. loosing power

BIGGER IS NOT ALWAYS BETTER!

2.25 - 2.5" is usually the right size you want for an NA

Suggestion 1) finish off your exhaust. with the lot. Mandrel bent etc. etc.

In terms fo your gear box..

I DO NOT KNOW IF THIS WILL WORK FOR R34'S AND I DO NOT TAKE LIABILITY OF THIS. I am simply showing you information that already is there..

YES.. this is GHETTO mod..

YES.. that wire is probably usefull..

YES.. it probably causes damage.. (throw a swich in to flick on and offf when needed)

http://www.skylinesaustralia.com/forums/in...howtopic=141351

Ill let you decide if it is for you or not..

wipe Apprentice

wipe

Posted
  • Author
Posted (edited)

hackerx,

i remembered the guy said something about i already had 2.5" extractors or something like that.

i dont really know much about the mechanics of a car unfortunently so i dont understand everything i'm told or read which makes it a bit harder.

on that same line, i am wondering what a valve body upgrade actually is and wondering if anyone in my area does it.

gts4wd,

unfortunently i dont really know what "the lot" is if you could maybe give an explanation on that, and about the gearbox solution....i have read that one and i really dont think id wanna take that chance with my car as i dont really want to cause damage, but thanks anyway.

thanks

Edited by wipe
Eug Grand Master

Eug

Posted
Posted

cris:

the term you are looking for is volumetric vacuum. where the gases being expelled causes a plunging effect and continuously draws out the new exhausts gases. nice explanation there though.

kel:

2.5" extractors probably means your join pipe, primary and secondary pipe sizes play a vital role as well.

try a search, most of the stuff has been covered in and around the forums and in depth as well. try searching for mv automatics (mike, i believe his name is). he does the valve body upgrades hackerx mentioned, basically makes it shift harder and faster.

if you dont know that "the lot" is, i suggest you try reading around the internet to get a feel for the basic fundamentals on how an engine works and the components involved. what i would guess cris means with "the lot"; would be extractors, catalytic converter, cat back exhaust going to the muffler/cannon.

the concept is simple, air goes in, fuel is added, spark occurs and an explosion occurs, the gases from the explosion are expelled through an exhaust system. try to visualize the process and pin point where what happens, when and where. what a place to start by opening the hood of your car and trying to follow the path i mentioned before. start at the intake and go from there.

cheers

GTS4WD Grand Master

GTS4WD

Posted
Posted

Suck squish bang blow :dry:

Thanks clearing that up Eugene.. :sick:

Heres a fantastic site..

www.howstuffworks.com

Type what you are trying to understand.. (eg. automatic gearbox, combustion engine, turbo etc. etc. etc.) Quite clear and simple explinations and clear diagrams..

wikipedia is also a good source.. aslong as some deadshit dosnt write it..

and its DEFINATELY a good idea to understand the basics before you do anything to your car.. so you know what happens.. why its better how it will change.. forums have a WORLD of information.. and missinformation..

Give it a few months and you will be a guru..

HackerX Community Regular

HackerX

Posted
Posted

It's easy enough to tell whether you have extractors or not.

Pop the bonnet and look for something like these:

Extractors (thanks to whoever's car/pic that is)

As Eug said, the primary and secondary pipe sizes play a role in the power gain (plus where in the rev range it comes in) for the same reason as mentioned above with the volumetric vacuum.

If you're unsure, but still ready to upgrade, then your best bet is probably to take it down to a recommended local exhaust shop, have them stick it up in a hoist and then tell you your options

MV Automatics is definately what I meant, it's on my list of things to do with my 34.

Other than that, you're best off searching in this section for all the usual NA mods to do.

GTS4WD Grand Master

GTS4WD

Posted
Posted
It's easy enough to tell whether you have extractors or not.

Pop the bonnet and look for something like these:

Extractors (thanks to whoever's car/pic that is)

mmm.. sexy.. Im not too sure about the bodgy red silicon.. dont know how many KM's thats gonna last.. but you know.. everyone needs to go through the bodgy stage of modification sooner or later!.. just too see the dangers and negatives involved with it..

wipe Apprentice

wipe

Posted
  • Author
Posted (edited)

thanks for the help guys...i will start a bit more reading up on some of it ( like on howthingswork.com ) and i am also going to have a look under the hood for extractors so i know whether i have them or not(i guess there at the rear of the engine considering they are to do with the exhaust?).

Eugene,

MV automatics seems to be in SA if i am correct and that is a fair distance for me as i live on the northcoast and am not exactly up for sending it that far.

I have been looking around the forums since i found it about 6 or 7 months ago and normally if i see something it is either way to expensive for me atm or there is a dispute on whether it is a good thing or not.

thanks

Edited by wipe
Eug Grand Master

Eug

Posted
Posted
thanks for the help guys...i will start a bit more reading up on some of it ( like on howthingswork.com ) and i am also going to have a look under the hood for extractors so i know whether i have them or not(i guess there at the rear of the engine considering they are to do with the exhaust?).

open the bonnet, it's on the right hand side of the motor. there should be 6 pipes branching together.

Eugene,

MV automatics seems to be in SA if i am correct and that is a fair distance for me as i live on the northcoast and am not exactly up for sending it that far.

i think MV automatics possibly does an exchange program. many people have sent their valve bodies down to him to get work done. my mate has should be recieving his auto drag box from the same guys (and we live up in queensland).

each to their own, if you search around you might find someone who can do the job locally. research around.

hope that helps

GTX-R34 Collaborator

GTX-R34

Posted
Posted
GREAT gains are to be made (have heard of 25 dyno proved KW made by a cat back.. hi flow cat.. Headers and down pipe)

me got a 3" catback and gained 16.9 kW!!!!!!!!!!!

Hi, love those headers, did you get them custom made or of the shelf. And if you dont mind me asking, how much were they?

Thanks.

MissR34 Grand Master

MissR34

Posted
Posted

yeah i know Eug, just sounds nice LOL

as long as my car is running right (which it is not at the moment) all is good, im a bit over the whole "need to have massive kW's to have a good car......you need have a turbo....that is annoying me the most at the moment) i just got my extractors fixed yesterday cause they were leaking...didnt have to pay nething cause it was under warranty.

but i got a clunking noise happening when i turn the car on........got a sneaking suspecion its got something to do with the timing belt....get it looked at next week

wipe Apprentice

wipe

Posted
  • Author
Posted (edited)

Eugene,

i have had a look and by the looks of it i dont have extractors so i might look into getting my exhaust finished off with headers,extractors etc.. and i might look locally first to see if i can get the valve body upgrade and if not maybe look into sending it down to mv automatics.

i'll get a picture later and put it up so someone may be able to double check me.

Edited by wipe

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • 677_GTR
      R33 GTR running -9 with no tune

      By 677_GTR · Posted

      Thanks for all the replies fellas. Gonna finish putting it back together and see how it handles the set up. If it starts pinging it’ll be parked.
    • suko
      J50 clock date suddenly reset to January 1

      By suko · Posted

      Well, I can recommend the partial AV system translation CD I ordered from Car Audio Workshop in NZ. Whilst it didn't address the date issue, it has conveniently translated on-screen menu items into English, and now allows the GPS-received time to be offset in hours rather than minutes, so I can display Eastern Australian time accurately ( and bump it by another hour when daylight savings starts ).
    • GTSBoy
      Baron's R34 GT-R build thread - car in Japan for 5 years -_-

      By GTSBoy · Posted

      Yuh, if it's 45°C outside, my car is driving in it.
    • soviet_merlin
      Baron's R34 GT-R build thread - car in Japan for 5 years -_-

      By soviet_merlin · Posted

      I'd be curious to hear more. Otherwise, have you driven a modern x-trail? I wonder how it compares. Here in Australia they are/were popular for rentals and fleet vehicles. I have been in some and my impression was they are bad. But, this may have been very different in the 2000s at a good trim level. Twenty years is plenty of time to make the model worse. I do very much agree with the 2 silver cars in the garage approach. But, not driving because it's too hot would not leave a lot of time in the year for many Australians. I don't think you need to worry too much unless the car has actual issues with overheating. 
    • BaronOBeefdip
      Baron's R34 GT-R build thread - car in Japan for 5 years -_-

      By BaronOBeefdip · Posted

      Back again. I returned to Japan in Jul/Aug to spend time with the car on my birthday and remind myself what all the sacrifice and compromise is for. It happened to line up with the monthly morning meet in Okutama, which I have been wanting to go to for a long time. It's a unique event at a unique spot with really rare, interesting, and quirky cars. It's where all the oldheads and OGs gather. The nighttime scene at DKF certainly has its place and should be experienced if you're into cars, but there's too much bad attention and negativity around it now. IMO the better time is Sunday morning at DKF or Okutama; it's more chill and relaxed. I'm glad I was finally able to go, but not sure it's worth the drive from all the way from Nagoya immediately the day before, unless I was already staying in Tokyo for the days right before the meet, because you have to wake up quite early to make it in time. Funnily enough though I didn't drive the car all that much this trip because it was just too damn hot. While there were zero issues and running temps were nominal and the A/C was strong, RBs already run crazy hot as it is. Sure, it took it all like a champ but something about driving these cars in the ridiculous heat/humidity bothers me and makes me feel like I'm asking too much of it. I'm just me being weird and treating the car like a living thing with feelings; I'm mechanically sympathetic to a fault. Instead I was mainly driving something else around - a KX4(silver) 2001 X-Trail GT, that I acquired in May. There's a few different flavors to choose from with Xs, but visually it's the Nissan version of the Honda CR-V. Mechanically it's a whole different story as this, being the top-trim GT, has an SR20VET mated to a four-speed auto and full-time AWD! It was a very affordable buy in exceptional condition inside and out, with very low mileage...only 48k kms. Most likely it was owned by an older person who kept it garaged and well-maintained, so I'm really happy with how it all worked out. It literally needs zero attention at the moment, albeit except for some minor visual touch-ups. I wanted something quirky, interesting, and practical and for sure it handily delivers on all three of those aspects. I was immediately able to utilize the cargo and passenger capacity to its full extent. It's a lot of fun to drive and is quite punchy through 1st and 2nd. It's very unassuming -in the twisty bits it's a lot more composed than one would think at a glance- and it'll be even better once I get better tires on it(yes, it's an SUV but still a little boat-y for my liking). So...now I have two golden-era Nissans in silver. One sports car and one that does everything else; the perfect two-car solution I think👍 The rest of the trip...I was able to turn my stressed brain off and enjoy it, although I didn't quite get to do as much as I thought. I did some interesting things, met some interesting people, and happened into some interesting situations however, that's all for another post though only if people really want to know. Project-wise, I went back to Mine's again to discuss more plans and am hoping to wrap that up real soon; keep watching this space if that interests you. Additionally, while working in the tormenting sweatbox that is the warehouse, I was able to organize most of the myriad of parts that my friend is storing for me along with the cars, and the 34 has a nice little spot carved out for it: And since it can get so stupid hot in there, that made it all the more easy -after I was standing there looking at the car and said 'f**k it'- to finally remove all the damn gauges that have mostly been an eyesore all this time. Huzzah. The heat basically makes the adhesive backing on the gauge mounts more pliable to work with, so it was far less stressful getting this done. I didn't fully clean it up or chase the wiring though; that will happen once I have the car in closer possession. Another major reason to remove all that stuff is to give people less reasons to get in my car and steal s**t while it's being exported/imported when/if the time comes, which leads us to my next point... ...and that is even though it's time in Japan is technically almost up since it's a November car and the X would be coming in March, I'm still not entirely sure where my life and career is headed; I don't really know what the future looks like and where I'm going to end up. I feel there's a great deal of uncertainty with me and as a result of that, it feels like I'm at a crossroads moreso now than any point in my life thus far and there are some choices I need to make. Yes, I've had some years to consider things and prepare myself, however too much has happened in that time to maintain confidence and everything feels so up in the air; tenuous one might say. Simply put, there's just too much nonsense going on right now from multiple vectors. Admittedly, I'm struggling to stay in the game and keep my eyes on the prize. So much so in fact, that very recently I came the closest I ever have before to calling it quits outright; selling everything and moving on and not looking back. The astute among you will pick up on key subtext within this paragraph. In the meantime I've still managed to slowly acquire some final bits for the car, but it feels nice knowing there's not much left to get and I'm almost across that finish line; I have almost everything I'll ever want for my interpretation and expression on what it is I think an R34 should be. 'til later.
×
×
  • Create New...