Just after a little bit of advice on my build, I made 221 bhp on a dyno dynamics dyno, from my b20z running 13.1 compression sodium filled I piece valves, full port job, twm 52mm itb's"s I have a feeling the cams are holding me back as they were made for a friends project years ago and don't feel they have enought lift....

Can anyone recommend a good cam for my build please also a header as I feel 220 for this setup is not right, I should be at least hitting the 230's

Many thanks

Edward

 

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I am thinking a cam and header change but really not sure what ones to go for

 

what cam, header and exhaust size you running at present ?

 

study dyno graphs of setups and the cams, see which setups make power where you want it

 

numbers arent bad... assuming the dynamics dyno isnt too generous... ( i dont know )

whats the number on the cams? i mean size... if you know
cuz it would be hard to suggest "something" without knowing the current figures
and also to further evaluate if indeed the cams are wats holding you back

"i feel" wouldnt be conclusive enough thats why...

on the induction side... sadly the TWM is prolly wat i would ever run last,
they are 52mm but "straight" and the plate is further out , making the whole geometry and size of the ITB small... (forget the plate size if they arent in the same length/distance as others)

you have to look at the relation between plate size and location + runner size to head transition... i dont like the TWM for those reasons, unlike other ITB's

you're most definitely almost set on seeing improvements with even just an ITR IM

it is also why most would say/think a manifold would be better, as almost every comparison we have seen was vs TWM LOL

not that im suggesting to ditch ur ITB set up..
but its a big factor in figuring out if you're thought of cam upgrade will be beneficial
which again makes it important to know.. wat ur current cam size is..
the dynograph helps alot so good stuff on that

HTH

 

Everyone wants to blame the cams.

I would switch to a good intake manifold, maybe header, maybe exhaust, and maybe fueling. Leave the motor itself, alone.

 

I am not sure on the cam size, my friend had them made for a high rpm (13000rpm) b16 he built, I brought the head from him as it was fully built and we decided to leave them in until we had the engine all up and running, I don't think there is much lift in the cam from what he told me as the were designed for high rpm ( I am not a technical person so a lot of this is over my head )

Header wise I am running a ebay ( quite expensive not sure on performance ) manifold 4-2-1 2.5" collector with decat and a spoon n1 system, think they are 2.5 all the way throughout but not sure.

Mapped on s300

I want to keep the itb"s more because in the UK not many people run them and they look cool lol but thinking a better set of cams will help a lot, ( would love to up the bhp and the tq figure buy 5-10 bhp.

Thank's for the input

 

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This is the header not sure how good they are.

 

Change the header and exhaust for SURE. Spoon exhausts are pretty restrictive.

Toda, Skunk2, SMSP or Meyers header, 3" exhaust, and maybe some RDX injectors - retune.

If you are serious about making more power, you'll ditch those cheap ITB's in favor of a manifold, or invest in some Kinslers.

*edit

Your header might be ok actually, it's a good design. Obviously not as good as the "real" one though.

 

What valvetrain are you using without knowing cam spec?

 

I didn't realise twm itb's were so bad they cost a fortune what's so bad about them???

 

thats the reason for what i posted earlier on, many would suggest wats 'easy for them
and or what they'd do... and not on to what you want or reason... your motor your choice id respect that

so i just identified the ITB (ur twm) situation to a plenum manifold...

the header looks okay... id prolly mod it a lil to make it suit ur motor/range

there are a few (alot actually) of cams you can try that'd give you better improvements from what you have now (since we now know most of ur set up to go by)

but try to find out from the previous owner wat Valvesprings/retainers you have
and if its unique... find out the lift and duration safety net of them...

this would give you a range of which cams you can use/run safely

 

S/s titanium retainers uprated springs and sodium filled one piece valves... 3angle valve job he can't find the paperwork with the lift etc

 

I'd keep the ITBs, they can be worth 40whp over a manifold

 

No. Its been proven plenty times over,too. I'd venture to say the Skunk2 Ultra would probably slaughter the ITBS you have now.