I have had a ported ITR intake manifold on the B20vtec in the wife's car all year, we dynoed the car in the spring with the new engine and made 242whp and 161tq. Here is a link to the build thread for more info...

https://honda-tech.com/all-motor-nat...0vtec-3200176/

She have been running all year at the track, runs 12.70s @ 111mph and that's in a leather Integra so it's working pretty good. I have always wondered about that flat spot up top on the dyno graph, it peaks at 8000 but the power drops off and I figured with the CNC head something was holding it back and I wanted to try an Intake manifold.

Over the winter I wanted to try an Ultra race or even find a set of ITBS to run to see what kind of power I can make but last week a buddy of mine gave me a VictorX, said to try it out to see what's up. I had gone back on the dyno a few weeks ago to check the tune and the power and it was bang on from the spring so all that was changed was the manifold, back to back with the ITR manifold.

I have to say I knew it was going to make more power up top as the Victor makes power from 7000-10K so that was a given, we had to clean up the AF a bit as it was quite rich but will it work at the track is the question. Gains up top sacrifices some in the mid range but time will tell, heading to the track Saturday morning to see what the difference will be if any.

Anyway, long winded as usual, here is the graph, ported P73 vs stock Victor X.

 

Good stuff, Ben.

Gonna save this for educational purposes

 

I'd try ITBs

 

I figured you would say that....haha.

 

B20VTEC--GSR Head, M24xx Camshafts, YCP Pistons, E85

VictorX




OBX 45mm ITBs

 

I'm interested to see how this goes as well. I think given the weight of the car the VX might hurt you. You need that torque. Gearing will play a big roll as well. Good luck and be sure to share

 

I think it's safe to say rocket cams like air velocity vs air quantity. At least that is the trend I have noticed that makes the best powerbands....

 

Nice, looks like you'll be faster down the 1/4 mile this time around!

 

curious to see the 1/4 mile results, keep us posted.

 

Seems like the ITR was a better all around manifold...

I dont think 5hp at 8400-and-up is going to be better than the ITR from 74-8400.

I would love to see a ported P30 thrown into the mix... Along with ITB's

 

FTFY

 

from the looks of the dyno chart, the ported ITR manifold was definitely the better manifold in the midrange. Cant really tell if its a better "street" manifold because the VictorX beats it under 5K. This could be because of the way it was ported.

IF this setup is used for drag racing, AND he sets the redline at 9500rpm, the VictorX will run a faster time. Zoom in on the powerband between 6500-9500. And look at the amount of power difference there will be at 8500+ vs the different between 7000-8000. Thats my opinion of course..

 

ITBS will be a waste of money if they aren't properly sized, lengthed and setup properly for the entire setup.

Hands down the Ultra Race for 2.x+ type builds and i'd venture to say the ultra street would probably be a very fair manifold for the 1.8's and under.

Most of the time, people put alot of weight in itbs, when they dont realize the people running the sets of ITBS and make alot of power spend close to 2K+ to properly set them up.


Had the OBX's Liked em. They were then opened up to 50MM and ported, as well as port matched to the head.,Lost on a track comparison to the AFI manifold.. I picked up 4MPH over the ITBS..

 

In Drag racing, the VictorX will be faster.

Depending on gearing, you're falling backing to where the victor starts to pick up and runs away from the standard ITR manifold.

 

With the gearing, the second gear shift will drop it just under 6500 but that's the lowest it will go. Will be primarily a drag racing car and will be swapped into a much lighter chassis as well.

 

I know the compression just isn't there either, will likely throw a set of 12.5 slugs in there over the winter as well instead of the 11.5s to see how much more I can make. At this point, seems to be the best gain per cost I can get.

 

let me help you design a piston with combustion efficiency and low friction as goals

 

Can't wait for this update...

 

Well with anything, results are bound to be skewed somehow from test to test and I did throw a major change in the mix before hitting the track. I had the Integra for sale as a roller for a while now and managed to find a buyer last week so I had some major work to do before the weekend to make things happen. I had a hatch lined up and ended up pulling the swap out of the Integra and throwing it in the hatch before the weekend. We checked the AF and it was pretty good in the other car and went to the track. So as far as a comparison from the manifold at the track it's too hard to say, but going from the Integra to a 92 hatch the car did pick up some ET and MPH even if we used the wrong sized slicks for the gear ratio as one of hers cut a tire and wouldn't hold air.

 

Hindsight is 20/20. Realistically the gains over the victor are hardly worth it. We're talking minimal, 5-7 and thats in midrange.. I'd venture to say some more Gear tuning, and timing tuning would probably even out the board fairly well.

Stick with the Victor, In the long run, it is a better manifold, and will respond better to modifications.

 

Setup ran 12.16 @114 in an eg and only hitting 8400 at the line so some better gearing and new slicks and it will be in the 11s for sure. Only made about 10 passes and she got faster every pass so looking forward to next year. I'm going to see if I can get the Victor CNC ported, not sure if anyone has done one and if I can't get it done I may try out an Ultra.

 

I'm not surprised at your results.

What size tb?

Also, what about porting the victor X?

There might be some gains to be had there as well...

 

Damn...dropped over .5 in ET and picked up 3mph? I don't know if that ALL can be put on just changing a chassis, hard to say though as so many variables depend on that. Whatever the case leave it...it's working.

 

70mm throttle body, and the manifold was opened up at the opening for the throttle body, that's it.

 

I'm severely gutted on my hatch, from stock form to gutted, i picked up alittle, nothing to write home about, my short track improved a bit but again, it wasn't anything major. It will take consistency to see gains first.