boost setting????

[tuffr33]

I have just purchased an r33 built by top fuel in japan.

And since i know very little about turbo engines as im a converted v8 man,i need some advice on what would be the correct boost pressure to run in this car for normal street use.The car is currently running 1.4bar.

rb25det,

hks 30/37s ball bearing high mount with external wastegate,

hks stainless exhuast manifold,

3 " full stainless and mandrel bent exhaust,

hks 280 deg cams,

z32 airflow meter,

trust intercooler,

apexi fc computer,

hks electronic boost controller,

Unsure of internals but someone has spent alot of money on this car,so i asume they're not standard.

Any info would be appriciated.

[Chef_32]

i can't comment on the boost, but all i can say is...

You must be loving it.

[«Cyph3r»]

I have similair setup and have kept it to 1.2bar as i am unsure also of my internals. If it is tuned well at the 1.4 bar in australia you may as well leave it at that but if it hasn't been tuned yet in aus i would be turning it way down until u get the af ratios checked or get it dyno tuned. Heaps of places in bris can tune power fc. I would recommend taking it to a guy called Gavin Wood who is at labrador (he really knows his $hit and has built a lot of big dollar gtr's with excellent results), can't remember his business name but if you want it just pm me.

Jamie

[tuffr33]

Thanks for the info,i'll give them a call.The car hasnt been tuned since it arrived,so it might be a safe bet to get it checked out.

And to the first reply,yeah its awesome to drive.You can drive it off boost like a normal car no worries,but step on it and your gone.

[RB20LagWagon]

If it hasnt been tuned in Australia then the boost should definately go down, Japanese usually tune their cars for higher octane fuel then our pissy 98 ron, They have 100+ ron standard. So 1.4 bar on our fuel may be a little high, if you dont want to turn down the boost, maybe use a octane booster,

[Hiroshima Screamer]

congrats on the buy , got any pickys ?

[tuffr33]

Here is a few pics...

[Steve]

Lucky you live in queensland, you wouldnt be able to get it registered in SA.

Have you got a hand controller? If so you can monitor knock, plus set the check engine light to flash if it detects knock.

Do you know what size turbine AR? I have just changed my 3037 to 0.87 up from a 0.61 and I am wondering what to expect WRT lag.

When do you start making boost, also when does boost hit hard? How are you finding traction?

Cheers

Steve

[tuffr33]

Hi steve,

Im in the process of getting a controller,due to a dyno run where the car richend out too much at around 4000 rpm and lost about 30-40kw.

Im not sure on turbine size but the plate on the turbo reads 30/37s56t,if thats any help.

Boost kicks in at around 2900 and peaks at around 4600 rpm.I have 265/40/17 on the rear and it has trouble getting traction from 60-90 k's when you give it heaps.

[Steve]

Hi, yeah the plate is the core id plate - so you know what the turbo is.

that boost seems a bit later than mine, which starts around 2400 and makes 1 bar at around 3k, I am not sure where it makes 1.2 bar, which is the highest setting I have tried, becuase I was just loosing way too much traction and it was getting a bit dangerous on the road when the back end steps out at 100kmh in traffic, that was using light throttle - sounds like you will get a taste when you pick up the 4000rpm range AF ratios.

The boost his so hard (with the 0.61) it was like using Nitrous, the torque and power lines were almost vertical at that point on the dyno. It was just plane crazy.

[Boost King]

Originally posted by RB20LagWagon

If it hasnt been tuned in Australia then the boost should definately go down, Japanese usually tune their cars for higher octane fuel then our pissy 98 ron, They have 100+ ron standard. So 1.4 bar on our fuel may be a little high, if you dont want to turn down the boost, maybe use a octane booster,

son of rajab no! Dont use a octane booster. In around 500km, you car will be splattering and doing all sorts of things. All my mechanics strongly advised against doing this as it fowls up the plugs in no time.

[Guest INASNT]

Nice buy tuffr33.

You wouldnt have a hope of registering it in Melbourne these days either. If u got variable boost control with your hks controller then set the boost low for street use and high when u want to have some fun.

Steve

I am getting a 0.82 rear on my 3037 hybrid

[Steve]

When is the turbo going on? Looks like mine will be good to go at the end of the week, hopefully tuned the week after.

Was it recommended that you use the 0.82? I went the 0.87 purely because HKS sell the RB25 kit with that housing, so hopefully it will do the job nicely, fingers crossed cos the housings by themselves new are not cheap.

[Guest INASNT]

it will be ready by monday and then its getting the comp cover polished. It will have 0.70 A/R comp with t66 comp wheel, GT30 twin ball bearing core with 0.82 A/R exhaust with special spec exhaust wheel, all rated at 600hp. Same guy that made leewahs 493rwkw turbo is making mine and he recommended those specs for what i wanted.

[Steve]

Sounds sweet, make sure you post up the results:)

[Guest INASNT]

will do, now all i have to do is get home so i can drive the thing