skunk2 manifold vs stock on b16a2

[delsol9000rpms]

hey guys what sort of gains would i get if i upgraded my stock intake manifold and throttle body to a skunk2 pro series manifold and 68mm throttle body. my relavent mods are as followed, toda spec c cams etc and hondata s300, 4-1 headers and 2.5 inch mandrel bent exhaust

[jords]

there would be gains however it would need to be tuned.

[Benson]

ITR manifold would be a better choice

[delsol9000rpms]

obviously it will be retuned....

benson: why would the itr manifold be a better choice.. im very interested to know.. the reason is bcoz ive seen people upgrade there itr manifold to the skunk 2 proseries..stupid i know loll ive thought about the type r manifold aswell but i just figured the skunk 2 manifold was better?

it would be good if people who have one on there car could give some info on how the car ran and wat gains were at each rpms etc..


thanks guys

[94vtirozguy]

you definately need to get tuned after adding an IM. Also look at upgrading your TB at the same time and getting the IM ported for new TB

[delsol9000rpms]

if you read properly you will see that i hav written i will upgrade my TB and retune my car so yee....

thanks anyway any feedback is better then none

[Benson]

ITR manifold has been done on some of our b16a's and yeilded some good gains... didnt do any back to back t esting, but there is certainly a good upgrade...

the biggest t/b ill recommend would be 65mm.. 68mm is stretching it

[dsp26]

wondering about the ITR thing too... from all accounts on t3h int4rweb... the obx/blox/skunk2 are exact cast replicas of the ITRs in design, plenum volume, runner length and ID.

the main difference is that the aftermarket variants have smaller coolant ports near the TB area to allow for port matching/boring without cutting into the coolant path... therefore only better than ITRs if your getting a TB bigger than the oem ITR.

[ACTI0NMAN-1]

keep in mind some go for the aftermarket intakes due to the stock ITR intake not fitting the p72 head.

My 2 reasons for an after market intake was for the p72head issue and the intake had extra nobbles for direct port nitrous/injection.

[dsp26]

^^^but their also cheaper than the going rate for USED ITR ones too!!

[delsol9000rpms]

ye true that... there around the same price if not cheaper then the ITR ones.. so which manifold is better??

[dsp26]

ye true that... there around the same price if not cheaper then the ITR ones.. so which manifold is better??

why not ask your builder? he'd be able to tell you based on your powergraph if you should justify the purchase...

as I and many others don't know the fullest of details of your setup, I'd dare say you'd benefit with the TOda C's.. but it all depends if your intake pressure is choking versus exhaust pressure

[Bludger]

the biggest t/b ill recommend would be 65mm.. 68mm is stretching itWhy is this??

Too big will lose performance?

[dsp26]

bumpage!!

sooo... delsol9000rpms... installed them yet? notice a difference?


to everyone else.... has anyone here got dyno sheets of an upgraded IM versus stock?

just got mine on and it really woke up the entire rev range... of all the butt dyno-ing my butt feels this one is definitely as noticable as cams.

now i've done my research and from all accounts on a stockish to mild b16a2 build the b16 IM is best until 7000rpm....

now for worked B16s with cams, compression, etc... the additional volume and design difference of ITR (or copy) IMs would make a huge difference due to increased air volume requirement right...

either way waiting for the next dyno day for comparo...

and **** me its sooo much better to drive without an intake system altogether (mine came off coz coupler wasn't clamped to tb)... mite run like this next time at wsid



Why is this??

Too big will lose performance?
depends what kinda work is done to the motor... going too big you lose air velocity especially if your motor doesn't actually need the extra volume.. it's one or the other. tapered designs would be an exception though.. kinda like a mini velocity stack.
more info here:
http://www.ozhonda.com/forum/showthread.php?t=80770&highlight=intake+manifold

[Benson]

Why is this??

Too big will lose performance?

i guess i was wrong, 70mm on a b16a made some power;)

[omgzilla]

keep in mind some go for the aftermarket intakes due to the stock ITR intake not fitting the p72 head.

My 2 reasons for an after market intake was for the p72head issue and the intake had extra nobbles for direct port nitrous/injection.

Sorry to hijack but, how do you tell what type of head you have?

I've got a B16A2 but unsure of what head i've got.

Do the skunk2, Blox, OBX manifolds fit all B16A or just the P72 head (seeing as the ITR won't fit P72)? I'm confused...

[SPEEDCORE]

You have a PR3... same as ITR.

[delsol9000rpms]

i havnt installed mine yet.. but i will be running a ITR manifold with an obx 68mm TB..... with my current head work should work a treat..

[delsol9000rpms]

dsp26... what IM and TB did yu get?

much better to drive now? more power?

[dsp26]

i havnt installed mine yet.. but i will be running a ITR manifold with an obx 68mm TB..... with my current head work should work a treat..

dsp26... what IM and TB did yu get?

much better to drive now? more power?


ended up getting the AEBS 65mm IM and a 68mm TB tapered to 65mm....

it really woke up the car (pretty sure it won't on a stocker though) on stock intake box still... and my butt dyno gauge tells me the gain is pretty close to cams versus stock (then again my cams only gained 14 horses peak and average 7hp across the powerband)

there was a feeling of struggle before when it revs on load.. now it just feels free... this whole time i thought having a 2.25 dc2r muffler on a 2.5in catback was choking the system.... it was the intake system of all things?!?!


you installing your own?? man pain in the arse to install.... took me 3days / 8hrs total and pulling everyting apart and back together 3 times to find all the airleaks causing the hunting idle. hope you have small hands... mine are bleeding everywhere :p

make sure you have new gaskets too... tried re-using mine and they leaked... ended up pulling it all off and using straight sealant...

[delsol9000rpms]

ye im a 3rd year aprentice mechanic so ill be doing everything like the IM TB myself there piss easy

[Benson]

i feel for ya dsp26,

Good work though for giving it a go

[delsol9000rpms]

i guess i was wrong, 70mm on a b16a made some power;)

ay benson do you mind me asking what was meant by that and why yu changed your mind etc? any further testing?

[pwr2w8]

hey guys what sort of gains would i get if i upgraded my stock intake manifold and throttle body to a skunk2 pro series manifold and 68mm throttle body. my relavent mods are as followed, toda spec c cams etc and hondata s300, 4-1 headers and 2.5 inch mandrel bent exhaust

By the way what is your compression ratio, if less than 12.5:1 then your wasting your time with the Toda Spec C

[delsol9000rpms]

where did you come from mate? are you an engine builder? i think my motor and choice of cams are doing perfectly fine thanks mate... if you think otherwise then feel free to pm me.. dnt mees this thread dnt reply here about cams its a IM and TB thread

[dsp26]

ye im a 3rd year aprentice mechanic so ill be doing everything like the IM TB myself there piss easy
good luck with it and do it on a coooool day lol. do it at your shop too if you have a hoist... the bracket underneath is an absolute nuisance


i feel for ya dsp26,

Good work though for giving it a go
mate.. far out... i spent an hour trying to figure why i couldn't get the new one on... turns out the bottom of the flange has hitting the alternator bracket so had to grind it off (head sitting lower from thinner gasket and milling)... looked at my old one and my builder actually did the same. also as per jimmy's advise i got rid of the vtir TB coz too much screwing around with fitting the b16a/b18c7 spring and rotor to work properly... bought a different 68mm tonight:thumbsup:


By the way what is your compression ratio, if less than 12.5:1 then your wasting your time with the Toda Spec C
dude... bad topic... leave it in this one but its pretty well answered and justified already:
http://www.ozhonda.com/forum/showthread.php?t=30153

[delsol9000rpms]

back on topic.. has anyone got dyno sheets of before and after Im & TB installs.. this is turning out to be an informative thread..

[Benson]

ay benson do you mind me asking what was meant by that and why yu changed your mind etc? any further testing?

Caused we made 127kw on our b16a with that setup. Even though i think we lost midrange torque peak numbers looked good... ;)

CTR pistons with BC spec 3 cams

[delsol9000rpms]

ye ive pulled my IM and Tb off a cupple times before... not that hard of a job its abit uncomfortable though..

[dsp26]

Caused we made 127kw on our b16a with that setup. Even though i think we lost midrange torque peak numbers looked good... ;)

CTR pistons with BC spec 3 cams

is the 70mm tapered? or im port matched?

i know i ask repetitive questions but you guys change your setup so much i can't keep track what combos you have on lol.. and the answers have changed:p

[Benson]

let me edit lol 123kw.. i forgot.. haha

straight 70mm slight ported IM

[Illegal]

wondering about the ITR thing too... from all accounts on t3h int4rweb... the obx/blox/skunk2 are exact cast replicas of the ITRs in design, plenum volume, runner length and ID.

the main difference is that the aftermarket variants have smaller coolant ports near the TB area to allow for port matching/boring without cutting into the coolant path... therefore only better than ITRs if your getting a TB bigger than the oem ITR.

skunk 2's intake manifold has improved the 4th runner making it better than a stock itr intake manifold. Don't forget to meter your tps before you remove it, so your idle isnt off. (surging)