R34 25gt Performance Mods - Trying To Keep It Legal

[GMan]

Hi,

I am currently driving a 1998 Nissan Skyline R34 25GT in a Semi-Automatic. It should run around the 150kw mark and all I have is a K&N air filter. I am also currently on my red P's, first year which means that I can't have any modifications done to my car - not that I'm gonna follow.

Anyways, what mods can I install to boost up my car - which is also not too obvious to the boys in blue

Cheers.

[GTR Power]

id be interested in this as ill be in your exact situation very soon, im geting my license back after a speeing offense, so ye im on my red ps, im gonna buy a semi auto r34gt, ive got a mate who does performance nissan gearbox's, but im not sure if this would do much to a standard 25gt?.. anyways, how is the car? do they have enough power for every day use and a lil bit for sum added fun every so often ??

[666DAN]

You can get a shift kit to make it a bit less sloppy on gear-change.

Decent exhaust, porting and cams...maybe something like the new e-manage ultimate to trim the fuel and increase timing and raise the rev limit.

[GTR Power]

hey 666dan wat do u reccon all that would cost champ? do you think a shift kit would make a noticeable difference to the standard tip tronic, and with all this any chance of keeping up with our turbo buddys?

[666DAN]

The shift kit would definately help, used to have a 25GT and would have liked crisper shifts in it.

I'd say for cams, porting, e-manage + tune you'd be looking at $3500 at the very most, some good shopping around will drop that price for sure. While you've got the head off the car, would maybe be worth having it decked and put the compression up a notch. You'll only be able to use 98+ octane though.

An exhaust can vary greatly, my CES exhaust was $2K, but it is awesome

I think you may be competative with stock GTts for sure, you've got about 100kg weight advantage over them.

[satanic]

Get one of those SS Turbo kits that put the turbo under the car at the rear; the cops will never know where to look

I'd save the money for mods and wait till you get off your Ps then upgrade to a GTT

[GTR Power]

hey santic, u reccon it would be hard buying a stock 25gt-t and changing that turbo rocker cover?? lol cops prob wouldnt know the diff, how do u go around registing a turbo as a non turbo shifty styleS? btw no way i can wait 3 years, how much do those turbo kits cost u were talking about

[satanic]

One from SS Turbo (I think that's the name of their company) is about $10k

Don't think they do it for Nissans; I've only ever seen their work on a Holden Commdore (single blower out back) and a BMW M3 (twin blower out back). Both cars were seen at the Auto Trade Fair a few months back.

[R34 Rampage]

Does anyone have a link for one of these shift kits? How does it work, a more aggressive/high revving gear shift programing with transmission cooler?

I wouldn't want a high stall on my auto since that would make fuel consumption go down the drain hole!

[mad082]

the shift kits just make them change gears quicker. they don't give you more power.

as for mods, get a set of extractors, and a full exhaust. that should give you noticable gains, but your car will be noisey. probably louder than a turbo, depending on how many mufflers are in the system. but it will sound sweet. then just something like a safc2 to control the fuel.

[GTR Power]

but buy changing gears quicker, your making the car go faster? ye?.. anyways wats a "safc2"??

[GTR Power]

can anyone explain to me how a manual valve body works? and wat the dif is from a shift kit?

[sloazr33]

shift kit - gear changes are crisper/ quicker and the auto can still change gears by itself

manual valve body - everytime you need to change gears, you need to move the stick (it will not change by itself)

[GTR Power]

kool thanks sloazr33 , wat do u guys recomend ? shift kit or manual valve body ?

[SKiT_R31]

kool thanks sloazr33 , wat do u guys recomend ? shift kit or manual valve body ?

Well imo, your auto for a reason (to be lazy) if you want to change gears yourself, buy a manual or convert yours.

definately a better way to go, but if you awnt to keep the auto, then its obvious, you just want a shift kit

[NA_R33]

its really a personal prefrence... if the skyline gearboxes are anything like the infinity which im pretty sure they are... you dont actually modify the valve body to manualise it rather an extra control bypasses the operations of the auto computer... about 60 bucks from MV automatics.. but with out a shift kitted valve body the shifts are still slow and sluggish.. Depending on how far u go with the shift kit u can make autos chirp gears during shifts just like manuals...

[WazR32GTSt]

you've already got a tiptronic by the sounds of it, so just go a "stage 2 shift kit" which simply firms up gear changes.. basicalyl makes gear changes instantaneous so it chirps between gears on full throttle... do a search for more info i have posted the results of when i did this

for "hidden" mods, i would suggest...

exhaust: extractors and cat, but with stock cat-back. if its loud, it will be obvious that its modifed

intake: new air filter and cold air intake

head: adjustable cam gears

computer: some kind of adjustable management. try the SAFC2 for a cheap option

this will take base power from about 110rwkw in stock form to maybe 125rwkw. don't expect much more without big $$$ being spent. unfortunately you don't see the gains that you get with a turbo car...

best of luck,

Warren

[WazR32GTSt]

shift kit review: http://www.skylinesaustralia.com/forums/in...mp;hl=shift+kit

[SKiT_R31]

for "hidden" mods, i would suggest...

exhaust: extractors and cat, but with stock cat-back. if its loud, it will be obvious that its modifed

intake: new air filter and cold air intake

head: adjustable cam gears

I dissagree (with the exaust only) there is alot of restriction in stock exausts, its not just pipe size, also flow etc (stock mufflers now being old on alot of cars, and they were cheap and basic to begin with) you can give a car a sports exaust and still have it quiet, and still get the gains, alot of the time, the sound is jsut because people want it, because it makes the car sound powerfull.

If you go to an exaust shop and you say you want the car to sound stock, but have a high flowing system on it, they'l do it happily, it just requires some mufflers a bit bigger.

Say a large resonator and a large high flow muffler with no tip (i.e. ending in normal piping) it will just look like you have had your exaust replaced, due to age or some other problem etc (and after a few months you wont even notice its new) and it will be quiet as, infact you could have a happy medium, like a tiny bit of a note, very quiet, nothing to turn heads, but just a nice sound.

And as for Stock looking mods, pretty much ANYTHING internal, Like Raising compression (if your sticking with N/A) by shaving the head/block or changing pistions, porting and polishing, lightweight gear, a mild cam...

etc, as long as you keep the engine tidy, but stock looking (like no chrome shit etc) if the boys in blue ever ask you to pop the hood, and they see a stock looking engine staring back at them, they wont hasstle you.

Things like keeping an airbox (maybe a bigger better one off another car) if you change the intake piping, paint it black, not chrome, you can still run a K&N filter etc...

go the sleeper

[WazR32GTSt]

mate i disagree completely..

not on what you are saying, because you are right and i know that its not goign to flow great

but for this particular guy who wants it to look stock not just sound stock. an aftermarket exhaust will look aftermarket. all you have to do is look under the car and hey presto there's teh exhaust! cops aren't bright and don't car that its quiet if it looks aftermarket

for that stealth look but trying to get some more power, stick with the stock cat-back.

after all, its an NA car and won't respond to exhaust mods like a turbocharged car

horse for courses, and for this particular application its got to be the way