fmic + stock turbo

[N I B]

I've never seen a GTS with an oversized cooler loose any thing

over a STD core, but as the turbo is usually changed at some

stage a big core is the best option,The GTSt I posted earlyer

has a 700HP core and is better everyware, not saying the car

would not have been better with a 400hp core, just look

at the future plan.

[rev210]

There are a number of people who have experienced a notable drop in response , even though they pick up horsepower, by fitting overly large intercoolers to stock turbos. Not everything performance wise is there on show on the dyno printout, unless your goal is to win dyno shootouts I would not take them as gospel.

Assuming you do plan to move on to bigger things later fitting a 700HP cooler for a planned output less than 700HP is pretty dumb in hindsight.

Looking at the future plan is all fine and dandy but, c'mon most of these guys still could have 'aimed' at some power figure. As they say ' aim at nothing and you hit it every time'.

[N I B]

I drive the cars on the road after the Dyno no more lag than STD

Most people remove the Nissan bov, that is the biggest mistake.

The factory valve is a recirculation type .

If the throttle responce is not better go back to your tuner.

[rev210]

Steve, I think you'd agree with me on the idea that a 44gal drum takes longer to fill than a 2L icecream container.

At some point an oversized intercooler loses the race against time to fill the volume in between the turbo and the plenum. The rpm for full boost is the same (therfore no lag, cause the turbo spools at the same engine speed). However the 'time' to achieve engine speed (which is greatly assisted by being on boost) is affected by the larger volmue and distance required by the oversized intercooler.

The stock intercooler is not real flash, even for the stock turbo, but if you are going to spend the best part of $2k on a replacement make damn well sure its the right size.

As you mentioned before the person with the 700HP intercooler would have been better off with the 400HP unit (if thats his eventual target). Maybe the 400HP unit was cheaper as well?

At the end of the day $2k spent on a 700HP intercooler(with std turbo) will put your car firmly in my rear vision mirror, with my poxy standard intercooler, over a 1/4mile, when our cars have the same mods. Get a 300HP unit plumbed up right and it is a different story.

Just want people to think about how important the size matching idea is.

Agree about the BOV too Steve.

BTW mate do you know the flow on the standard unported RB25DET head?

[SHUTO-BOY]

Ive got an aftermarket Bov,and its fine after some tuning.I think maybe its the quality of the fitment or the car's condition that makes it stall,have no throttle responce?Would mounting the bov in a different position help?

[JH32]

I was thinking of moving my atmo-bov from the standard position to just after the intercooler, once the cooler is fitted.

I want to hide it behind the front bar

[rev210]

shuto-boy,

a BOV is a BOV, it's just that the factory one is quite good. I don't think an aftermarket one can't work as well fullstop. It's just that it seems difficult to do so (or selction of brand plays a part). If you like the noise thats what you have to do anyway I guess.

[GTS-t VSPEC]

Or buy one of those electronic BOV which just make the pssht noise for you:lol:

See'ya:burnout:

[SHUTO-BOY]

got it rev,thanks.Vspec,ure kidding right?how can anyone in the right mind produce that.Must be hot in the usa,they got lots of wierd stuff there.

Right now i got a 12 psi stock turbo+Fmic,going to change ecu soon,ill post some results

13.6

-outlaw racing team-

hate drugs,love racing

[GTS-t VSPEC]

I wish I was kidding, but I'm not

See'ya:burnout:

[N I B]

BOV is not BOV , try a hi flowed factory turbo with out the factory

BOV- Compressor surge- the factory valve opens at light cruise

after market valves are in most cases to tight, tru storys I see a few a month.

[GTS-t VSPEC]

Steve,

So do you recommend keeping the factory BOV or not? And does it matter what power your producing?

See'ya:burnout:

[rev210]

Steve,

It makes sense, the factory one has a small air bleed (hole on the underside) people mistake for the factory BOV not holding boost at light cruise due to it being so-called 'too lightly sprung for high boost apps'.

There is someone with a thread about blocking the hole off on the performance section!

[rev210]

Vspec,

Iv'e seen a 500+HP GT30 equiped R33 gtst with stockie BOV.

[GTS-t VSPEC]

rev,

I'm not disputing that it can be done, but is it actually better then using an aftermarket BOV at that sort of power? 500+hp with a GT30, there might be hope for my car after all.

See'ya:burnout:

[rev210]

507PS at the wheels on stock BOV. Didn't even have an aftermarket plenum.

I think the aftermarket ones have the lovely sound your after tho' paul, to go with the ricey stickers and big wing.

[rev210]

I'd use the stock one till it stops working.

[GTS-t VSPEC]

rev, piss-off bitch. I'm not a ricer, the sticker are to add power, and the wing to keep my ass on the ground:lol:

I have already replaced the stock BOV, and don't have any issue with my aftermarket one, so I'll keep is, besides I love the sound:P

See'ya:burnout:

[rob77]

Well the cooler is here, anyone want to donate some funds to the "pay for robs intercooler" fund? Should be in the car in couple of weeks.

[GTS-t VSPEC]

rob,

Hope it was worth the wait, post some pics once it's in.

See'ya:burnout: