10 sec. RB26DETT Powered S14 Silviia

[underground]

Hi,

We are building our shops project car at the moment, a 98 240SX with RB26DETT Motor.

We are using Hybrid's (Australia company) new turbo upgrade for the RB26DETT that they are fixing to release in both Australia and the USA. It's a GT28R .7 a/r housing non-ball bearing turbo that they say is good for 400HP. I saw a dyno where it made 420HP on a SR20DET.

We are keeping the twin turbo setup and are trying to figure out what the best upgrades would be to make 600HP reliably. I don't want to go into the internals of the motor any more than I have to. I'm not trying to create a beast, I want a 10 sec. daily driver.

Our motor sponsor is Apexi, so every part that we can get from them, we will. My question is the sizing of the headgasket, camshafts, etc. I know you guys are the masters for advice and we just need to figure out what parts are needed to build a reliable motor.

Camshafts: I don't want to change the head, so my options from Apexi are 8.9 lift, 260/270/280 duration, any ideas on best duration selection?

FMIC: Hybrid Power 600x300x76 (Bar and Plate design)

Oil Cooler: Apexi Pro-Max Oil Cooler

Headgastet? .86 mm, options are T=1.1, 1.5, 1.8

Injectors: 850cc Sard x6

Clutch: Exedy Twin Plate clutch (NM032SD)

Computer: Apexi Power FC D-Jetro w/ commander

Boost Controller: Apexi AVC-R

Suspension: Apexi N1 Pro System

Wheels: FN01R-C 18x8 Front, 18x10 Rear

Nitrous: NX Direct Port Kit 120 shot (20x6)

Roll Cage: Cusco Chromoly 8 pt. cage+ 2 side bar addons

Radiator: Fluidyne Racing Radiator

Any other suggestions?

Thanks for you guidance,

Chris Riggs

Underground-Motorsports.com

[hippy]

i dont' mean to sound rude or anything like that ... since the car is sponsored by apexi why aren't u using an apexi intercooler and turbo?? i'm sure apex makes better gear than hybrid ... i'm not saying that hybrid are crap ... in fact hybrid is very good especially for their price ... but surely apex are huge and therefore should make superior stuff??

[hungry6]

Also to the point, u might need abit more than 600hp to run reliable 10 sec, but if your tuner is REALLY good then u can push a fair bit further with stock interals. but how far i'm not gonna guess.

To run a RWD into the 10s on street tyres requires lots of driver skill and awesome suspension set up. hope that help.

[underground]

I should have explained what a "sponsorship" actually means.

I am partially sponsored, meaning I get products at or near cost. Apexi USA has been very good to us throughout the whole process. Their turbo's are made by IHI and their discounts aren't very deep. I could actually get HKS turbo's cheaper than Apexi turbo's even being sponsored. That was the one part that they told me they couldn't really help me on.

The reason we went with the Hybrid Intercooler and turbo's was because they were FREE and they asked that we "test" these turbo's for them. They have not been released to the public yet, and are still in the test stage. I think they are due out later this year. I have only got positive feedback from our customers on their intercoolers, but the turbo's are new to us.

Thanks for letting me clear up your questions.

I still need answers though on cam selection, etc from the Skyline Pro's, lol!

Thanks!

Chris

[tomj]

I wish you the best of luck with it

Anywhere we can follow the build of the car?

[underground]

Thanks for the info.

As for now, I don't want to change out pistons, rods, valve springs, etc. I want to simply do some "bolton"

items until I can afford to really do a nice upgrade.

My knowledge of cam selection is very minimal, which is why I'm asking for guidance. I have been told by several shops that to make 600whp all I need to change is cams, headgasket, injectors, bigger fuel pump, and bigger turbos. I have everything except for the headgasket and cams. I still don't know whether the .86mm T=1.1 or 1.5 headgasket would be better for our current goals.

My second questions is :Would changing out the stock cams (which are 8.9 lift currently I believe) and replacing them with the same lift but higher duration such as a 264/272 be beneficial.

Or should I just wait and run the stock cams for now and get high lift cams later. I just don't want to hurt the motor in any way. Your suggestions are appreciated.

Chris

(P.S.- The car will first appear in the March issue of HCI magazine, unfortunately it's a magazine that isn't sold in Australia. I will try to scan the articles and post them as they appear throughout the 2004 issues. Thanks!)

[Guest INASNT]

u might also blow the stock internals with a 120 shot of nos, maybe go a 75 shot instead!