Race Car Tech Discuss anything related to road racing and auto X.

Custom CAI

Old 11-27-07, 06:25 PM
  #1  
SCCAEP
Thread Starter
iTrader: (3)
 
SCCAITS's Avatar
 
Join Date: Dec 2006
Location: Dallas
Posts: 1,080
Likes: 0
Received 0 Likes on 0 Posts
Custom CAI

I think this is a good idea, but before I do it I'd like opinions from those knowledgeable on this subject. I've bought some 3"mandrel bent tubing and couplings and am ready to hack away.

The plan on an FC 13b NA.... run a 3" mandrel bent pipe from the AFM (with adaptor) into the passenger headlight area. Seal the headlight area (headlight deleted) and put my cone filter in there. Air flow comes from a deleted FTP signal and turn signal, with the openings cleaned up. I may even add a NACA duct to the headlight cover for even more air flow.

Flame away or will this work good? I know this has been covered a million times in the 2nd Gen section but that's on street cars. This is race only.

It's no longer an ITS car, so IT rules do not apply. Building to NASA PT.
SCCAITS is offline  
Old 11-27-07, 07:32 PM
  #2  
GET OFF MY LAWN
10 Year Member
iTrader: (1)
 
jgrewe's Avatar
 
Join Date: Feb 2005
Location: Fla.
Posts: 2,838
Likes: 0
Received 0 Likes on 0 Posts
I took a magnahelic guage and measured air pressure in that area and got positive pressure with the ftp lense and the turn signal removed. That was at all speeds and rpm's up to about 150mph.

Your fuel map may change in some rpm range because you will end up with some Helmholz resonance changes in the intake system with the extra length. And you'll need to remap for the extra/colder air anyway.
jgrewe is offline  
Old 11-27-07, 07:54 PM
  #3  
SCCAEP
Thread Starter
iTrader: (3)
 
SCCAITS's Avatar
 
Join Date: Dec 2006
Location: Dallas
Posts: 1,080
Likes: 0
Received 0 Likes on 0 Posts
Thanks John, so it sounds like this will work better than just having the filter right after the AFM for the time being? I don't want to go backwards in design. I'm currently running a FPR with stock ECU (clipped limiter) is all right now but have some decent HP numbers and curve. Over the next couple of months I will upgrade to a standalone (no idea on what yet) and may end up having the throttle body and intake manifold ported but not the motor (NASA rules point thing).
SCCAITS is offline  
Old 11-28-07, 08:14 AM
  #4  
GET OFF MY LAWN
10 Year Member
iTrader: (1)
 
jgrewe's Avatar
 
Join Date: Feb 2005
Location: Fla.
Posts: 2,838
Likes: 0
Received 0 Likes on 0 Posts
Anything that can give your engine cooler air will help. You'll just need to be sure the 3" pipe isn't choking you but I think the AFM is your current restriction. Once you go stand alone you can pitch it. Start reading about the Megasquirt right now and by the time your ready to change you'll be comfortable enough with it to save yourself a few grand.
There isn't much metal to really gain diameter in the manifold so be careful. The length of the runners is what limits your power up high in the rpm band more than anything else. The t body will give you some gains, air travels faster passed it than any other part of your car so smoothing things out helps.
Rotarygod has some good threads on manifold design and runner length, find them before you touch your manifold.
jgrewe is offline  
Old 12-15-07, 03:40 PM
  #5  
SCCAEP
Thread Starter
iTrader: (3)
 
SCCAITS's Avatar
 
Join Date: Dec 2006
Location: Dallas
Posts: 1,080
Likes: 0
Received 0 Likes on 0 Posts
The air intake is done. The AFM will go when I go standalone (90%), for now this may be an improvement, at least I hope.

I ended up making a box out of fiberglass with an aluminum lid. The FTP and turn signals got removed and cleaned up. The box captures all air coming through the FTP and turn signal openings. Pictures below.

I am taking it to the track this week. The air is really going to be forced into the filter with the box, not sure if that will have any negative impact. Rain - I race in the rain, do you think that will be a problem?

Constructive feedback/criticism/suggestions. Thanks.

...and this is NOT SCCA ITS anymore, ITE now. Building to NASA rules instead now. I really should change my screen name!













SCCAITS is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
joel(PA)
Group Buy & Product Dev. FD RX-7
8
10-04-15 06:07 PM


Thread Tools
Search this Thread
Quick Reply: Custom CAI


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: