Jump to content
SAU Community

Recommended Posts

Hey everyone, I have been researching this topic for a while and the opinions are quite mixed,

I have a built Rb30det Neo torque monster built by Lewis engines, the head has been ported out extensively and currently has 272 cams sitting in it,

I want to downgrade my camshafts to be able to retain vct,

My end goal is to produce max torque as early as possible in the rev range (max rpm 7200)

The important bit is i want to engineer the conversion so I need to keep emissions down.

Should I

A) Downgrade to poncams 252 or 260 have heard they can pass emissions test have only heard but can anyone please confirm.

B) Put standard cams back in.

Engine specs are as follows

Lewis engine rb25/30 Neo torque monster

Extensively ported with 24psi spring upgrade

8.2cr

Rips racing plenum 90mm throttle body

Sinco manifold t3 flange

Turbosmart 50mm external waste gate

Planning on

Gtx3076r

Id1000 injectors

3 inch exhaust.

Haltech Elite

I know downgrading the cams will negate the big head work but the application for the engine has changed from a drift car to a 4wd. Any opinions would be appreciated, I will put up a build topic in the future

Cheers in advance

Link to comment
https://www.sau.com.au/forums/topic/459024-rb30det-neo/
Share on other sites

Ditch the big throttle body and run a standard one. Will give a less sudden response from closed throttle.

Run a bigger exhaust. 3.5 inch will be enough. Under a 4wd you should have plenty of room to play with.

Unless you plan on running a 1.06 turbine housing on the GTX3076, consider a turbo spec that has better match of flow between hotside and coldside. Borg Warner have some pretty good offerings and prices are very good depending on what you choose. Not physically small units, but if it's sitting in a 4wd engine bay then space isn't likely a concern.

What's the advice/recommendation from Lewis about cam spec and turbo for this application?

  • Like 1
Link to comment
https://www.sau.com.au/forums/topic/459024-rb30det-neo/#findComment-7588186
Share on other sites

Dale, was originally tossing up between gtx3076 with 1.06 or gtx3582 with .82 but opted for the smaller turbo.

I will have a look at the borg warner series though, and with the exhaust size I didn't want to run the 3.5 because I didn't want it to be too loud and don't think its necessary for my goal, which is not outright horsepower but good torque throught the rev range

This motor was obviously designed for a bigger turbo and with current cams was meant to have a massive midrange and top end torque

Because the application has changed I feel as though I don't want to waste the potential of the motor but at the same time be usable as a fun 4wd, the only thing that's stopping me from going all out because I want to make it street legal and engineered.

Link to comment
https://www.sau.com.au/forums/topic/459024-rb30det-neo/#findComment-7588197
Share on other sites

  • 2 weeks later...
  • 4 weeks later...

I can't understand why I don't here more discussion on this forum about twin scroll setups. If you're going the GTX3076R get it with the 1.04 Twin Scroll rear housing and get a PROPER split pulse manifold with duel wastegates etc.

I did this on my FJ20 and it runs a GT3071R with the 0.78 rear split pulse and manifold. Makes 21psi at 3500rpm and peak torque just after that yet pulls hard to make around 270rwkw. The engine is a midrange animal.

I can only imagine on the twin cam RB30 with a relatively small turbo (GTX3076R with 1.04 split pulse) You'd probably have full boost before 3000rpm and still make 320rwkw. That to me sounds like the ideal street motor. The added benefit of the proper split pulse manifolds is the improved volumetric efficiency which may negate the need for aftermarket cams at that power level all together.

Link to comment
https://www.sau.com.au/forums/topic/459024-rb30det-neo/#findComment-7610814
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • I’m not sure what happened I told them about sonic tunes free OTS tune and the next the I know .. I was booted..   To funny 
    • Yea - I mean I've seen my fuel pump which is decades old and uh, while I'm not saying this with real knowledge... but I sure get the ick at using anything in the fuel system that produced the state of that pump. Many years ago I went through multiple pumps (and strainers) before I dropped the tank to clean it out with extreme violence. I'm talking the car would do maybe 50km before coming to a halt, which resulted in me cleaning out the filter with some brake cleaner and going on my way. None of my stuff ever looked like what came out of your fuel tank. I don't think I'd be happy with it unless every single component was replaced (or at least checked/cleaned/confirmed to be clean here).
    • I'm not going to recommend an EBC pad. I don't like them. Just about anything else would suit me better. I've been using Intima pads for a while now.
    • Agreed, and in particular the earth strap that should go from the subframe to the chassis but it often broken or left off. There is a section in the R32 workshop manual you can follow for troubleshooting if you don't see anything suspicious, and depending where you are (there is no location on your user profile) you should be able to get your hands on a second hand replacement unit still if needed
    • Yeah they mention as a R34 for 2.5 Turbo...but then again thos "small" were also for R34 by that different site. But i look into it and that 310mm EBC is for R34 GTT. And by those you linked the specs are the same 🙂    EDIT: I found these on one site here: DBA 4000 series T3 DBA42304S They are 310mm...and it says are for R34GTT...are there good? EDIT2: ok they have pads too.  What "color" should i get for street use? I dont want/need some noisy ones...(and if they are not that dusty that is good too)
×
×
  • Create New...