Thread: Thinking about a custom manifold

Hi Miko if u were to bulid an intake for a NA ve using Xcessive Manufacturing stuff what would u build

sorry mine should read, horsepower is good, but torque is what makes the car fun to drive

thread revival....
getting close to having the funds for this.

throttle body wise, what do people thing, 70mm N1 or 80mm billet item?
the billet item would be about $150 more

70mm is plenty imo

I'd tend to agree. 80mm is a bit excessive on a na motor, i think you'd lose to much down low.
(thats purely opinion though, i'm happy to be proved wrong)

Bit of a bump as i will soon be recieving finances to put this thing together...
I really think that the intake side of things is just waiting to be uncorked for some killer sr20ve performance.

Im looking at using the std sr20ve flange and base of the runners to ensure that it bolts up to the head ok (and dont need to change injector mounts etc.

I will be using a 70mm N1 throttle body.

I need some thoughts on what velocity stacks I should use, as well as ideal runner lengths and plenum volumes.

THis is the range of stacks that I can get

Home - Velocity Stacks/Aluminium

For those playing along at home, the engine specs are :
sr20ve
10.3:1 compression
N1 cams
adjustable gears
ASP budget header and 3"
Currently peak power tops at 193hp at ~7200rpm, and dies off soon after.

I want to push this to ~8000-8200rpm power peak, holding onto this for as long as possible, with an increase in overall power obviously.

I will get the end result flow benched to ensure that all runners are getting equal airflow, as I dont want to lean out on one cylinder.

Anyone have any knowledgable input?

Pending the design actually working, the local guy making this for me may be interested in building a few more too.

i am very interested in this option as well. your engine is basically unopened except the n1's correct?

http://www.grapeaperacing.com/tech/inductionsystems.pdf

There we go, crunch the numbers yourself, It has calcs for runner diameter and length and Plenum volume


For a street car you want to spec your runner length for peak torque. Drag racing with a close ratio box spec if for peak horse power, for road racing somewhere in between. I'd spec for peak torque personally but thats up too you.


Edit, that link seems to be broken. I'll see if I can find you another link

Another good link

Intake Manifold Tech: Runner Size Calculations - Team Integra

Vizard is a legend, I would take practically anything he says as gospel. No man alive has done more dyno testing than him. He is also employed by a host of manufacturers and race teams for development

Edit, Also that is page two of the article their is some good info on the first page which is worth reading

nice post! so it looks like you want to go with shorter and wider runners for higher rpm power. unless your making it a low reving motor.