Hi guys,

WOuld my setup be considered a high output setup. The reason I am asking is because I bought a Hytech Replica Big Tube Header and from what I read in a relatively new post, there might be a possiblity that my 1.8 engine is not capable of being high powered enough to work well with that header. My setup is:

JDM 1.8 ITR block with CTR pistons (compression will be around 12.5-12.7)
B16a Head PnP with Skunk2 Pro2 cams
Js Racing Whale ***** Intake
CTR intake manifold
Spoon Venturi 70mm TB
98 spec ITR tranny
310cc injectors
Spoon Exhaust (62mm)

What are your thoughts? Should I change to the Small tube header for better gains? Is the header really suited to work only on 2.0 litre setups?

 

anyone?

 

A few things, I get your compression around 12:1.
Get rid of the Js Racing Whale ***** Intake, since you've been doing research you'll know that a 3" intake pipe with a V-stack will out perform that intake by a bunch.
Your exhaust is also to small also, 2-1/2" minimun with a test pipe or high flow cat. I think the 62mm is the OD.

A high compression 1.8ltr 12.5:1 or higher will be moving enough air to benefit from that header, you're close. Good Luck.
What are you tuning with?

 

I have a S300. Where can I purchase the Intake system you reccommend?

 

AEM Cold Air intake for the Integra Type R will be the best off-the-helf intake for your application (assuming you are in a 92-2000 Civic or 94+ Integra).

If you want to run a straight velocity stack (no filter) that is up to you, but I wouldn't reccomend that for daily use.

I think you are a little over cammed for your compression, but if I remember correctly we had better results with the big tube replica headers on 1.8 and 2.0 motors. The small tube versions were not much better than garden variety after market units.

Despite what I just said, don't go chaning the cams, if anything you'll end up with a nice flat torque curve and room for improvement if you decide to build the bottom end.

Have fun... and post some dyno results if you get the chance.

 

I am so sick of hearing PRO 2's are too big for everything!

 

Your compression ratio will be higher than 12.7. See link below.
https://honda-tech.com/forums/all-motor-naturally-aspirated-44/pct-ctr-piston-compression-ratio-717928/

 

PR3 head/B18C Block

STD = 12.58636786521145
.25 OS = 12.649248792586258


Taken straight from that post. How does that equate to more than 12.7? Also, when I calcualte it on zealworks, it I get 12.7 with OEM headgasket, hence me using the range 12.5-12.7.

 

Whoops, missed the part about the PR3 head.

 

the pro2 makes the sheep feel like they got something big down there.

regarding the header size, the big tube was to big for my 230 whp motor. the small tube out performed it by as much as 9 whp in the mid range. must be one of those size things if its bigger it must be better.

 

Wrong value in my calculator, 12.6~12.7.

 

Well my motor made 215whp with the regular tube and 221whp with the big tube, so it shows that not every setup will respond the same. The top end with the big tube was greatly improved.

 

What intake were you using on your setup? I am asking because I am wondering if the velocity stack will make a tremendous difference over the J's Racing Whale ***** Intake.

 

I was using a 3" pipe through my headlight with a vstack on that setup. I currently use an AEM 3" with a vstack.

 

Does your Vstack have a filter on the end? Or is it open ended?

 

Also, I have a spare exhaust which is about 2.75". Will that be too big for the setup?

 

do u want high numbers and a useless power band or do you want good numbers and linear power band? if you want high numbers than stick with the mixed and matched parts you have if you want usable power and a well balanced motor you need to rethink your approach. your parts need to have good symmetry to compliment each other and produce a smooth power band.

 

Whats the best approach to take from here in then? Please offer any suggestions which would allow me to make good power and have a linear power band. If I need ot get rid of the big tube or anything else, I will. I am open to suggestions.

 

head and block are fine, intake manifold is good also. it wouldnt hurt to have it ported. ive seen gains of up to 8whp from having this performed. a set of skunk2 pro1's or skunk2 stage2 would make power all over the power band. ive always seen dips post vtec engagement from tri-y headers vs. 4-2-1's. TB is too big also, 68mm should provide good induction volume and velocity. get a 3 inch intake pipe and have the length tuned on the dyno. has the head work been done yet?

 

Yes head work has been done already.

 

Buy them both, dyno, and sell the others to your pals, like most on here do.

 

im starting to think that a lot of people are under the impression that the PRO1 is more radical than the S2S3, like the PRO series picked up where the tuner series stopped. maybe thats why the pro2 is heralded as the Goliath of cams.

im just chuckling because this is about the 4th "built" motor that the OP didnt "build" and is in here asking us questions rather than the Red Fox who built it. i could be wrong.

 

I drag race my car so **** the midrange! I launch at 7800rpms and never see under 7500rpms again so "a linear powerband" is not necessary in my build. I deal with good power from 7500 and up and the big tube delivers exactly that.

 

there it is in a nut shell

 

Ok guys. I am going to change the Big Tube Header, as well as the J's Racing Intake. Do I have to change the cams as well? Ironically, I have a set of Pro1 cams as well. I only just bought the Pro2s because I thought they would work really good with my high compression setup. Also, should I get the small tube header or the Narrow Header. Please make your suggestions. I dont want to make more mistakes, so please lead me in the right direction before I waste all of my money. We dont have a big car scene in my country, so there is no real guidance from motor builders or anyone. I am going to get the advice from you guys and then have it built in the US. Also, I have two exhaust systems and unfortunately, I am going to have to use one and lose one. The first is the Spoon Mid-B pipe which is 60.5mm or 2.38" and the second is a 2.75" exhaust. Which one would work me better in this situation? Please guys, lead me in the right direction.