hey ht
i have a oem itr mani thats port mached already to my head etc etc and is portmached to my 70mm TB. Mi main question is. Will the itr mani choke my engine up top. I know it will make great power till about 7k rpm butt what about after. Setup pretty nuch consist of cp 12.5 CR 84.5mm pistons on eagle rods, ls crank, b20b block, alaniz ported b16 head(miled quiet a few times) with supertech dual valvesprins, supertech flat face valves and k series retainers and cams will be tunner3s tunned on e85, id1000cc injectors. Headers will be the tri-y big tube ones to a 2.5" straight tru exahust. Im shoting for 240whp butt will be happy with what ever my tunner tinks is good. If anything my other option is the victor X. I know the x will make more top end power butt if its like 5whp more then the itr then its ok with me. I need to make a final desicion b4 i order more parts from blueR.

 

with the setup you listed using tuner 3's, 70mm TB and trying to hit a 240whp goal it will be a little harder with that intake manifold i feel like it would choke it a little trying to go for that whp goal but i would run the Victor-x witch would provide a better power curve to redline

 

Yeah i know it will choke it. But to what point. The 240whp is just a goal butt from the looks of it. People make around the same power with less CR so i might surpass thats goal. Ill wait for more people to pich in their toughts.
Thanks

 

I would run a custom Endyn intake manifold.

 

a set of jenveys would suit that motor nicely

 

CNC'd ITR?

 

Then mind as well purchase the victor x. I know the cnc'd itr will kill the X. But how much is it ro cnc it.

For the set of these itb i can build another b20v

to expencive

So any more ideas. So far im on the itr side. Ive spent alot of time in the Allmotor hp tread and didnt really se a itr vs X comparison on a b20v or maybe i missed it. Ill keep on loking.

 

You should be able to find an ITR manifold for $100 and to have it cnc'd be like $500.

 

If you read my original post. I already have a itr mani..... 70mm tb thats port mached to my b16 head. If the cnc was arounf 300 then i would be willing to pay that. butt for 500 thats just a lil to much. I understand that it beets the vic x.

 

Read trough this https://honda-tech.com/forums/showth......ProFunction Presents Bseries Intake Manifold Tests Version 2.0(L) Endyn Edelbrock ITR. Does anybody have a graph of a stock itr vs a cnc ported itr mani. How much does the cnc itr mani make over the stock.?

 

I recall at one time I came across the ITR vs CNC'd ITR was about 8-10whp. Sorry can't find the details.
Now wouldn't a CNC'd Victor X be better than a CNC'd ITR? A Magnus custom beats the CNC'd Victor X.
I think once you do some of the math about plenum volume for your build you will find the ITR is to small. You will need to increase the plenum to get the most out of you motor.

 

I did a virgin ITR mani vs. CNC'd one once upon a time on a b18c- 1.8L pump gas engine. It was about 6-9whp worth(out of a current 200-205whp range). On a larger displacement engine it'd be worth a bit more.

 

now the next question would be is, who is still CNC-ing those manifolds.

 

Im not loking for an all out all motor build were half a hp counts. this engine is going to be for a DD and ocasional trip to the 1320. All the parts that i have so far were bough at prices that are unreal to say lol or along those lines. The main point of this build for me is to save as much and still make some good numbers and run some good times at the track so if it can be achived with a itr mani...im down...if not then il order a vic x from blueR. Im really not loking at dumping 500 +/- into a intake mani were its going to make 5-10whp more then a stock itr. So im at the desicion of either a stock itr or the vic x butt damn the x is so big and flasshy.

Yeah people will go a long way to gain 5whp and pay a ton to.

Thats a good question for the ppl that mite be wondering.

 

exactly. i dont know why everyone says it when its no longer offered. everything is done by hand now. maybe the people who offered it before can some how bring it back

 

My cnc'd itr manifold is at a second machinist now trying to figure out how to manage porting it for a reasonable cost. With my first machinist it would've costed about 800 dollars for the first 5 to get done. It would be my 20th one before the price dropped to 300.

 

(mid point of 6-9whp is ~7.5whp, then adjust that up 12% for the b20 vs. the 1.8l he tested on so ad another hp and then "a few more" and you get 10whp+ gains)

10whp on a 280 flywheel hp motor is huge too. 4% more power is certainly noticeable and he is just talking peak power I believe, it should make more power everywhere though. Up to you if it's worth a few hundred bucks for that but the vic x is a few hundred too and he did dyno tests showing the cnc'd itr beat it on a very similar motor to yours so I don't know why you would look at the vic x.

this is of course one of those things you can do later too. just put your motor together now and then maybe later test a few intake manis and see which one works best.

 

I could have swore I saw something on Steve's site about it, but there's nothing about intake manifolds at all that I can find on there right now, so I don't know.

 

So, here is one of the best tests I have seen and caters specifically to what you are trying to figure out. https://honda-tech.com/forums/all-motor-naturally-aspirated-44/kingmotorsports-b20-vtec-intake-manifold-header-test-pump-gas-2174099/

I am by no means an expert, but here is my .02. I am in the process of a 84.5 x 92 build that will be used mostly for weekend fun, some autocross and maybe some laps around a track. I contemplated on what to do for an IM and went with a shortened ported px and a 68mm pp tb and pro2s. It hasn't made the top end power you might expect, 245 at 8200 rpm, but the torque and power is in a more usable range and is better than the peak power of some other engines that are similar using pro3s. I think for the money, you should go with the ported/cnc'd ITR and pro2s, because of what you intend to do with the car. The vicx is too big for what your intensions are, but so is the compression of what you are putting together. Compression will play a big part of your build and will be able to carry power in the upper rpms better than my 12.2:1. I don't know enough about e85 and 14:1 on a DD. Sounds a little risky, but I could be wrong.

I would save up the money and port the ITR. Just my .02...

 

maybe we can start a group buy some how?

i dont think it will be hard to find 20 people.

besides all that, it would be nice to get a cheaper price, keep us update

 

yeh i also remember that he port mani's as well. i wonder if he still does it, steve, where are you to answer this??? lol

 

definitely shows that the type r mani is one tough mani to beat. i think honda made it for us for our future/bigger builds lol

 

It'd be nice to do a group buy, but i have my doubts on finding 20 people up front to bring down the cost. I'd do the run on my own but im also not exactly Thurston Howell the 3rd. Keep in mind that these costs are just purely machining. I havent even factored the actual manifolds and slicing them open/rewelding. Hopefully my next guy can hook it up a little better.

 

providing the manifold is a different story, it would be a lot cheaper to source a used one, but it depends on the customer of course.

i would like to see how this turns out, keep us updated.

btw, i have 2 manifolds collecting dust thats ready lol

 

[QUOTE=neverstop;44040494](mid point of 6-9whp is ~7.5whp, then adjust that up 12% for the b20 vs. the 1.8l he tested on so ad another hp and then "a few more" and you get 10whp+ gains)

10whp on a 280 flywheel hp motor is huge too. 4% more power is certainly noticeable and he is just talking peak power I believe, it should make more power everywhere though. Up to you if it's worth a few hundred bucks for that but the vic x is a few hundred too and he did dyno tests showing the cnc'd itr beat it on a very similar motor to yours so I don't know why you would look at the vic x.

this is of course one of those things you can do later too. just put your motor together now and then maybe later test a few intake manis and see which one works best.[/QUOT

Im really not loking ofr an all out all motor build. Id really like to know how much power will i be losing out of i just do a stock itr mani. if its 10whp then that kool with me. For a first build im already pushing it a lil to far with the whole idea os 14ish CR.