hmmm puzzeled as to which turbo to use

[legend01]

Guys

looking for bit of advice as to which turbo to run as this question has been asked so many times its not funny so perhaps im better of stating what i hav so far and looking for opionions as for rwkw hav no fixed power goals just cum what may ok parts hav so far

460cc high flowed injectors

gtr nismo fuel regulator

gtr fuel pump

3' exhaust

fmic 620x200x70

hks panel filter with cold air induction

electronic boost controller

ported and polished head

hks cam gears

maybe set of cams not sure yet

remote oil filter

and im geting the wolf 3d v4 ecu

just trying to find out if it does away with geting the 300zx afm

just not sure of which turbo to put on it been thing bout the hks either gt 25/30/35 or the 40

so lets c some opinions on this looking for some good usefull information

thanks Peter

[Steve]

Engine? Manifold?

The wolf 3dv4 for skyline (plug n' play) can be used with MAF or MAP

[legend01]

oh by the way its an rb20det

[legend01]

standard manafolds 4 know

[Steve]

And what is the car being used for? what sort of power are you after? Street, circuit, drag?

[legend01]

cars prob just gonna b used for street maybe a drag or 2 from time to time , as for hp not after anyfixed amount just wanna c what i can get out of it for whats being done to it hav a spare engine that i might try building up over time but for the moment i'll just play with the one i hav in the car and c what power i can get out of it . People will hav differing opinions on what it will get and what it wont and what turbo to run for what hp as we all know bigger turbo bigger power more lag well myself i dont know a great deal bout turbo engines being into bike and v8 most of my life so now im gonna learn bout turbos what better way than to listen to people in the know

[Steve]

Well, looking at what you have done mod wise, probably not too hard to come up with a solution. Just be aware that there are many different solutions, and its not as cut and dried as you may think.

there are volumes on here already about turbo selection, what to expect etc, also the limitations of different mods.

Basically, you are only running a GTR pump - which will limit you to around 250rwkw. That is also pleny to destroy an RB20 gearbox.

Do a search and look at something along the lines of HKS 2530, or even a high flow RB25 unit.

Either of these will deliver 230rwkw, and you will probably find your gearbox is at its limits.

Alot of your mods are a bit over the top for that sort of power too.

Seriously, have a look around the forum, use the search tool, there is heaps of info on RB20s, turbos, and other mods as well as when you need to look at doing them.

[BHDave]

Basically you want the smallest turbo that will give you the power figures you want unless you want major lag.

BTW you have a lot of mods considering you have a stock turbo.

I'd set an upper limit of 250rwkw with the standard bottom end so would be looking at the 2530 or 2535, which have both made this figure (though the 2530 is really pushing it at these power levels)

I currently have a stage 2 GCG highflow on a virtually stock rb20 and it's just way too laggy atm. Potential 270-80 rwkw supposedly once it's all tuned. ATM it starts to get interesting at about 4200rpm

[Roy]

I'd set an upper limit of 250rwkw with the standard bottom end so would be looking at the 2530 or 2535, which have both made this figure (though the 2530 is really pushing it at these power levels)

I havent seen all that many modded RB20 powered cars, but are you sure that these power figures are attainable from a std RB20 with even a 2540? (I mean actually know of a car with this setup and that hp?)

[BHDave]

JMS Onevia made over 250rwkw with a TD06 and there was also a budget build article in Zoom (I think) that was making 250rwkw with a 2530.

I am a bit doubtful about the 2530 making this kind of power (some magazine power figures seem a little inflated to me ) but if the engine is sound then it should have few problems making this type of power.

Then the question is how long will it hold together. Not all that long is my guess. Both of the above cars have been through atleast one engine.

edit: I'll know for sure in about 3 months when i have a go with tuning mine (once the fuel is sorted) just to see whats possible. Then turn it back to about 220 or so i guess for reliability as the car is a daily driver

[Roy]

I hear what you are saying about some dyno figures. It means more to me to be told originally had X_rwkws, now has Y_rwkws, so read as a percentage increase.

I have a TD06 but using a smaller exhaust housing then the JMS Onevia, but with the proper manifold and wastegate...so im hoping for around 230rwkws, fingers crossed that can be attained at around 1-1.2bar (currently tooting around at 0.65bar)

If you are thinking of the white R31 Wagon in Zoom, some earlier issues on this car said HKS2540, some later ones say 2530??? Still even if the figure is a few kws high, who cares, i have been for a ride in an R33 with a 2530, and it was plenty quick for me, actually i wish i owned it.

[BHDave]

Ah, i get you now.

By having a base line figure for the stock engine you can then look at the percentage increase for a given mod, rather than some magical rwkw number and eliminate any dyno fudging.

Pretty certain it was a 2530 on the skyline based on how the compressor cover looked. I've seen a few like this but never a 2540 with that cover.

R33 with 2530 would be making boost at idle! And making a fair bit of power to boot.

My problem with inflated dyno figure in magazines is they have no need to inflate them. Give people a genuine figure that is realistic and they can aim for it if they want. The S13 drift silvia figures are out of this world and from everything i've seen and read (even in the same magazine) are unatinable with the stock turbo. If you or I tried for these numbers we'd blow something up. Then people start quoting them, as i have done, and then people start to beleive that this turbo makes this power and heads off to buy one and are disapointed with the end result.

p.s. I think we hijacked the thread, sorry guys.