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25/30 Neo V 26/30

Huzqld

By Huzqld,
in RB30 conversions

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Huzqld Enthusiast

Huzqld

Posted
Posted

Just after opinions on a 25/30 using a neo head vs a 26/30 setup. I'm aware of the smaller combustion chambers on the neo head needing different pistons etc.

It's going into a VL so either way I need to change a lot of things. I have got a neo head on the way... But wondering if I should go to a 26/30. Chasing around 450-500hp for now on 98ron, and run into the 9s eventually.

Don't want to build a 30neo and later down the track regret not using a 26 head.

So just wondering, which is the better choice. Sorry if its been covered before.

Cheers

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Ben C34
Ben C34

Neo wins in my mind. Solid lifters and vct.

Simon-S14
Simon-S14

heads dont have a boost/power limit

Huzqld
Huzqld

Yeah I suspect it'll be a fair way out, surely the dohc will be flowing a lot more at all revs as well as the extra comp. and ecu has no way of knowing

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Simon-S14 Grand Master

Simon-S14

Posted
Posted

neo has shim over bucket where as 26 has shim under bucket. the 26 head is much more reliable at sustained RPM, have seen a few neo's spin shims out lately destroying the heads. that said.. its pretty hard to argue with VCT and extra CR

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sleptema Proficient

sleptema

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Can you run the 26 style under buckets in a NEO head?

one was a stock head stock cams and the other was poncams type b's but stock everything else.

and no the buckets are different sizes, the 26 head was made with sustained rpm in mind

So that is a no to running 26 cams in a neo head? I'm finding it hard to get upgrade options on neo cams, other than tomei poncams. And with the VCT, isn't there a limit on the lift/duration they could possibly run?

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Ben C34 Grand Master

Ben C34

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So that is a no to running 26 cams in a neo head? I'm finding it hard to get upgrade options on neo cams, other than tomei poncams. And with the VCT, isn't there a limit on the lift/duration they could possibly run?

What sort of cam are you looking for?

Surely you don't want huge duration and lose vct?

I would have thought the type b tomei cams are sweet for most people.

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sleptema Proficient

sleptema

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What sort of cam are you looking for?

Surely you don't want huge duration and lose vct?

I would have thought the type b tomei cams are sweet for most people.

Well I wanted to sacrifice a little low end power for wank factor of overlapping on idle. My mate has the HKS step 2's on his gtr (272's, 10.5 or something) and the idle is just magnificent and lumpy.

It's hard to choose between right cams for the turbo/engine, or the sound of a lumpy idle. I understand I will get a new hole torn for saying it, but IMO a nice idle makes a car have more presence. Obviously if it makes low rpm a pig, I would rather go for drive ability.

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Ben C34 Grand Master

Ben C34

Posted
Posted

Well I wanted to sacrifice a little low end power for wank factor of overlapping on idle. My mate has the HKS step 2's on his gtr (272's, 10.5 or something) and the idle is just magnificent and lumpy.

It's hard to choose between right cams for the turbo/engine, or the sound of a lumpy idle. I understand I will get a new hole torn for saying it, but IMO a nice idle makes a car have more presence. Obviously if it makes low rpm a pig, I would rather go for drive ability.

I really struggle with that logic.

If it idles shit of course it will be a pig down low . That's why it idles bad.

That has to be the silliest reason to get cams.

If all you want is a wanky idle do it with tuning. Run it lean.

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sleptema Proficient

sleptema

Posted
Posted (edited)

I really struggle with that logic.

If it idles shit of course it will be a pig down low . That's why it idles bad.

That has to be the silliest reason to get cams.

If all you want is a wanky idle do it with tuning. Run it lean.

Obviously I want cams to make the most of what the engine has to offer, but I thought if I could get a lumpy idle it would be nice as well.

I am not familiar with tuning, and I wasn't aware leaning it out would cause a lumpy idle.

I worded what I wanted to say really poorly in the previous post. I am still trying to learn, sorry if I sound like a tool.

Edited by sleptema
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XKLABA Grand Master

XKLABA

Posted
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I have 250 poncams in a 26/30 and it has quite a nice tough lumpiness to the idle but low end power is just awesome and it drive hard from about 2200rpm, below that and the gearbox starts to labour

IMO the right cams and turbo configuration setup right and the 26 head wins, that said the worlds fastest toughest RBs run 25 neo heads yeah!! Oh wait no they don't :P

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iruvyouskyrine Grand Master

iruvyouskyrine

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XKLABA have you got any videos of your car? Have been keeping an eye on what you post and now it's running i want to see it!

I would also like a slightly angry/lumpy idle but i don't think standard neo cams are going to give me that haha. Are you really able to tune it for a lumpy idle and have no engine health side effects?

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XKLABA Grand Master

XKLABA

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Josh, are you in Sydney? Ifso I'm going to try and get out to the next Texi for a looksee and will be taking the 34 out come down and I'll take you fora run :)

My car wasn't tuned to be lumpy it just happened that way :/ , but yeah you can quite safely tune for a lumpy idle, cam timing can also make it lumpy, when I first bought the car it was setup with 260 poncams and was lumpier the a bridge port 13b I pulled up next to :( not my thing would rather a nice calm idle

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iruvyouskyrine Grand Master

iruvyouskyrine

Posted
Posted

Josh, are you in Sydney? Ifso I'm going to try and get out to the next Texi for a looksee and will be taking the 34 out come down and I'll take you fora run :)

My car wasn't tuned to be lumpy it just happened that way :/ , but yeah you can quite safely tune for a lumpy idle, cam timing can also make it lumpy, when I first bought the car it was setup with 260 poncams and was lumpier the a bridge port 13b I pulled up next to :( not my thing would rather a nice calm idle

In Newcastle but will come down to the next texi for a squizz. When/where is it?

I still don't think that the standard 236/232 NEO cams will get anything close haha!

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