Neo Head Or Not?

[Ben C34]

Hi guys,

I am planning a 2530 into my S2 RS stagea (rwd, neo)

Now heres my dilemma. It is my daily, so need to be able to do an engine swap in a weekend, so cant pull down my engine to do it.

I have bought an RB30 and a non neo RB25de to use the head.

The plan is to put the neo inlet manifold onto the head, due to injectors, sensors etc.
The thing is I know the neo exhaust valves are bigger, so how much would using a non neo head hurt the power?

I am not after huge power, currently making 285 with a GT3071 and will be using the same turbo. Looking at improving drive-ability and torque.

I have searched like mad but cant find an answer.
So has anyone put a non neo rb2530 into a car that had a neo, and what was the outcome?

Thanks

Ben

[Adriano]

have you considered using the head that you already have , just build a new bottom end and swap the head once the motor is out

[Simon-S14]

is it the r32 version of the rb25de? IF so why do people still bother with these things??

just put the neo head on the 30 bottom end.. that way its going to suit your loom and ecu, plus everything else will bolt up

[SilverECR33]

have you considered using the head that you already have , just build a new bottom end and swap the head once the motor is out

this++...

seriously..

[SilverECR33]

also, you cannot just dump in the 30 and fire it up and drive it, it will need to be tuned. and it will be faster and cheaper to use your head. as you havnt thought about ignition changes.

[Ben C34]

Thanks. it is an r33 head.

The issue with using my head is the time it is going to take to have to weld up oil feed and run external line.

I have a Nistune and am running ls2 coils so ignition wise no problem.

I am leaning towards using my head, will just need to wait a while as a result.

[KiwiRS4T]

Use the Neo head - its is far superior. Whatever you do its is very likely that your car won't be ready for Monday so if you can't borrow a car plan to use some taxis or hire a cheap car for a week.

[jet_r31]

Neo head is far better...you'd be silly to go backwards..

what about 25/30 height difference, i thought(maybe wrongly,i havn't done it) that you have problems with manifolds

due to extra height? can you use standard inlet and ex manifold?

where did you dyno your car?

cheers

darren

Edited June 13, 2013 by jet_r31

[Ben C34]

Thanks guys, thats what I thought!

And no joke about no matter what it wont be ready in a weekend, I was deluding myself for a bit there.

Just wondering if anyone knew from experience, but I suppose people dont normally try a backwards step to see how bad it is!

Edited June 13, 2013 by superben

[Ben C34]

Neo head is far better...you'd be silly to go backwards..

what about 25/30 height difference, i thought(maybe wrongly,i havn't done it) that you have problems with manifolds

due to extra height? can you use standard inlet and ex manifold?

where did you dyno your car?

cheers

darren

Hi,

I have roughly checked the height issue, and it seems all good. Was planning on triple checking soon, there is always the option of dropping the engine a little to gain more clearance if needed.

Car was Dyno'd at Garage 7, plus I bought the nistune individual licence and already had a wideband data logger.,

Tuning seems pretty good, at cruise and WOT, but there are some heaps rich spots around 3/4 throttle to tweak. Its the VE map thats doing it.

[discoPumpkin]

Now I've had some good head in my time, but Neo would top the list, she just goes and goes and goes

Edited June 14, 2013 by discoPumpkin

[NYTSKY]

If someone can show me a NEO head out perform a non NEO head for power and response on the same motor ill eat my shirt.

The only advantage I see with a NEO head is the ability to use bigger cams while retaining VCT, all other differences would be hard pressed to see a change on a dyno.

Use what you have and save your $$$.

[discoPumpkin]

http://www.skylinesaustralia.com/forums/topic/426942-lewis-engines-rb25neo-head-vs-there-rb26-head/

enjoy your meal

Edited June 14, 2013 by discoPumpkin

[NYTSKY]

What are you showing me exactly?

Spend a few grand on any head and it will out flow a stocker.

What I am saying is by bolting on a NEO head over a non Neo head you are not going to see something magical happen power and response wise.

[discoPumpkin]

that's just like saying leave the single cam head on, because with double cam u won't c improvements in power and response

Everyone knows if u can retain VCT, it significantly improves bottom end response and torque

but since he has the non neo head already then it will still get the job done

[NYTSKY]

that's just like saying leave the single cam head on, because with double cam u won't c improvements in power and response

Everyone knows if u can retain VCT, it significantly improves bottom end response and torque

but since he has the non neo head already then it will still get the job done

You are comparing two TOTALLY different heads there mate.

[KiwiRS4T]

Speaking from experience there is no clearance issue with an RB30 in a Stagea even the strut brace fits no problem.

[discoPumpkin]

You are comparing two TOTALLY different heads there mate.

so r u

[jet_r31]

If someone can show me a NEO head out perform a non NEO head for power and response on the same motor ill eat my shirt.

The only advantage I see with a NEO head is the ability to use bigger cams while retaining VCT, all other differences would be hard pressed to see a change on a dyno.

Use what you have and save your $$$.

youd be safe as you know its not going to happen..lol, i bet on a 150mph car there would be,maybe not the small shit though

cheers

darren

Edited June 14, 2013 by jet_r31

[discoPumpkin]

Since were Ozzy's, please use km/h