Thread: Fresh B13 ve swap plus diy header

Nice numbers. I am curious how much volume you added to the plenum when you modified it for the Q45 TB flange. It is hard to tell from the small pics but it appears as though you increased the size/angle by cylinder 4 (closest to the TB). It looks as though you extended the length of the plenum as well. Increased volume on these small plenums should help. They were designed to be a best of both worlds for the 1.6 and 2.0L VE engines.

I am also curious if you have ever compression tested your VE engine and if so, what your numbers were? Thanks.


You should be able to re-size the photos in the settings of your phone or camera before you take the shot. You might have small selected instead of medium or large. Or maybe normal, instead of HD or something. A pixel setting of 640 x 480 fits perfectly in this thread form for older PC's like mine. 720 x ? probably works better for most. I am unfamiliar with the iPad though.

I have the first ipad(no camera). I can enlarge the pic for you guys, give me a bit as I'm lazy. I measured the in diameter of the sr20 ve manifold at its largest point 2 7/8 and carried this diameter to the TB. The manifold is only an inch or so longer now but with the larger diameter. I notice the stock TB was about 2 1/2 in diameter while the manifold tapered down to 2 1/4. So in turn with the stock manifold the diameter goes 2.5, 2.25, 2.9ish. Seemed silly so now mine has a continuous taper.
Sorry no real math or volumes here just eyeballed it.

Your intake idea is pretty similar to what I had done to mine:

http://www.sr20-forum.com/vvl/66058-modified-sr20ve-intake-manifold.html


I added 3" piping and extended the plenum. Then I added a 75mm tb to it. Your numbers kinda confirm that its a worthwhile mod. It felt great on my built motor. It's currently getting a elbow put on it to get the tb facing more towards the front of the car. Off course this will increase the volume even more.

We will be testing that mod here soon also. @P10FTW bought the stuff a while ago but just started doing other things and put it aside.We are positive we will get gains,based on what you physically saw restricting the inside of the plenum.
We will Dyno with the stock setup and then bolt on the modified upper plenum to get results under the same conditions.

Sweet let me know what gains are seen. I didn't Dyno on the stock manifold so I can't say what was gained. The throttle response and butt Dyno results made it worth it.

So as I said I would I went to the track last Friday night to get some passes in. Well I wish I had some slips to post but I don't. On a good note the two step works....see pics below.





This was the original tranny and it lasted 7years with a 350whp turbo setup and now a ve so I can't really upset. I'll be collecting parts for the 6sp swap now and the car will be going down for a bit. See the for sale sections for parts from this NA setup. I will be selling the header, clutch, flywheel and rad with fans.

Header pics!!

The first page of this thread and the na for sale section has images of the header.

Aw, that sucks man. I was really looking forward to see how the car does at the track. Good price on the header, should sell pretty damn quick.

Yeah I wanted to see how far I could get na but with this setback I'm just going to move on with my vet build.