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

Portmatching FC LIM to FD UIM

Old 01-09-09, 02:30 PM
  #1  
Junior Member
5 Year Member
Thread Starter
 
r/t_turbo2's Avatar
 
Join Date: Aug 2006
Location: philly
Posts: 44
Likes: 0
Received 0 Likes on 0 Posts
Portmatching FC LIM to FD UIM

Anybody know someone who can do this ? if so how much would it cost ... i already haveeverything just the them portmatched. So im shopping around seeing how much it would cost. Somebody help me out thanks.
r/t_turbo2 is offline  
Old 01-09-09, 04:52 PM
  #2  
Rotary Freak
10 Year Member
iTrader: (7)
 
sub9lulu's Avatar
 
Join Date: Jun 2003
Location: FL
Posts: 2,739
Likes: 0
Received 0 Likes on 0 Posts
get a little rotary tool ( dremel ) and do it yourself
all u need is a piece of gasket
sub9lulu is offline  
Old 01-10-09, 01:02 PM
  #3  
I'll blow it up real good
10 Year Member
iTrader: (1)
 
RX-Heven's Avatar
 
Join Date: May 2001
Location: San Francisco, CA
Posts: 2,390
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by sub9lulu View Post
get a little rotary tool ( dremel ) and do it yourself
all u need is a piece of gasket
Not quite that easy if you really want to properly port match them. There is simply not enough casting material to match them up.

You could always just port them to get the runners "close enough" which is what most people do anyways since they are just going for the look. Fwiw, power gains, if any, are minimal.

There are only two proper ways to do this and one is easier than the other though with less desirable results. How much of a difference in terms of power is debatable.

1. Shift the primary ports of the fc lim over closer to those of the fd uim using aluminum filer rod and then port match them perfectly, with minimal ovalizing of the runner. I did it this way and afaik am the only one. It is probably the most effective but also the most complicated. Use the fd lim/uim gasket.

2. Fill in the gap on the outside of the fd uim between the two primary runners. This will give you enough material to hog out enough of the runners to port match them but you signaficantly ovalize the runners in the process in that section. How this affects flow vs. the other method that minimizes the sudden increase and then decrease in volume is the questionable part. This method is far simpler to accomplish though and is how several have done it that have gone through the trouble to port match them. Use the fc luim/uim gasket.

There is (or was) a forum member selling adapters for this swap and that is the simplest solution. I did this to begin with but sold the adapter and port matched them. I saw a ~10-15 hp gain across the board after the change.
RX-Heven is offline  
Old 01-10-09, 03:16 PM
  #4  
Lives on the Forum
iTrader: (9)
 
BLUE TII's Avatar
 
Join Date: Mar 2001
Location: CA
Posts: 7,083
Received 145 Likes on 128 Posts
3. Fill in the gap on the outside of the fd uim between the two primary runners. This will give you enough material to port out enough of the runners to port match them but you ovalize the runners in the process in that section. Port the FD UIM runner diameter to equal the volume of the ovalized section. Port the FC LIM to the same volume as well down to a tapered section to normal diameter above the bend. Halfshaft/countersink and bevel the primary throttle plate when doing your TB port and clean up the plenum as well. Pin the manifolds so there is no chance of misalignment and you can minimize the port matching volume. FC LIM seconday runners will also need a minor increase in diameter to match the FD UIM. Use the fc luim/uim gasket. This method will probably decrease some low end torque if you are still using the double throttle mechanism, but may or may not increase top end power/flow.
BLUE TII is offline  
Old 01-14-09, 09:28 AM
  #5  
Junior Member
5 Year Member
Thread Starter
 
r/t_turbo2's Avatar
 
Join Date: Aug 2006
Location: philly
Posts: 44
Likes: 0
Received 0 Likes on 0 Posts
All this help/input is very helpfull thanks alot guys anymore options or ideas would be great pictures would be great too. I just ordered my FD UIM & TB w/ TPS sensor and im talking to a member on here about the spacer he makes to make this all work. I guess my next question is do it myself or use the spacer already made ?
r/t_turbo2 is offline  
Old 01-14-09, 10:49 AM
  #6  
Back door, no babies...
iTrader: (14)
 
Davin's Avatar
 
Join Date: Sep 2006
Location: LA, DC & Philly
Posts: 1,399
Received 0 Likes on 0 Posts
Originally Posted by r/t_turbo2 View Post
Anybody know someone who can do this ? if so how much would it cost ... i already haveeverything just the them portmatched. So im shopping around seeing how much it would cost. Somebody help me out thanks.
wait a second! i know who you are! you work at R/T tuning right?
Davin is offline  
Old 01-15-09, 04:05 PM
  #7  
Junior Member
5 Year Member
Thread Starter
 
r/t_turbo2's Avatar
 
Join Date: Aug 2006
Location: philly
Posts: 44
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Davin View Post
wait a second! i know who you are! you work at R/T tuning right?
No ... But i know Vince and Pat (who you thought i was) very well ... known them since they started and pat for years before that. You from the area ?
r/t_turbo2 is offline  
Old 01-15-09, 05:06 PM
  #8  
Back door, no babies...
iTrader: (14)
 
Davin's Avatar
 
Join Date: Sep 2006
Location: LA, DC & Philly
Posts: 1,399
Received 0 Likes on 0 Posts
Originally Posted by r/t_turbo2 View Post
No ... But i know Vince and Pat (who you thought i was) very well ... known them since they started and pat for years before that. You from the area ?
yeah, i bring my car there all the time
Davin is offline  
Old 01-16-09, 08:11 AM
  #9  
Junior Member
5 Year Member
Thread Starter
 
r/t_turbo2's Avatar
 
Join Date: Aug 2006
Location: philly
Posts: 44
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Davin View Post
yeah, i bring my car there all the time
no **** ... what car is yours i might have seen it ... well most likely anyways
r/t_turbo2 is offline  
Old 01-28-09, 02:37 PM
  #10  
4th string e-armchair QB
5 Year Member
iTrader: (11)
 
Trots*88TII-AE*'s Avatar
 
Join Date: May 2005
Location: North Bay, Ontario
Posts: 2,745
Likes: 0
Received 0 Likes on 0 Posts
adapter would definitely be the easiest route. Also, afterwards you would be able to sell the LIM / UIM's as stock if you decide to go back. But if RX-Heaven says that he noticed a difference in power (to the extent of 15-20 hp) by filling and porting properly, I would do it that way time/skill depending.
Trots*88TII-AE* is offline  
Old 08-01-12, 10:59 PM
  #11  
Full Member
iTrader: (8)
 
Join Date: Jun 2010
Location: visalia, ca
Posts: 149
Likes: 0
Received 0 Likes on 0 Posts
can yhou tell me where you found the adapter? i am looking for one
amxone is offline  
Old 08-02-12, 12:00 AM
  #12  
1308ccs of awesome
iTrader: (9)
 
eage8's Avatar
 
Join Date: Sep 2003
Location: Woodbine, MD
Posts: 6,176
Received 10 Likes on 10 Posts
Originally Posted by amxone View Post
can yhou tell me where you found the adapter? i am looking for one
Rising RPM
eage8 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Turblown
Vendor Classifieds
9
03-30-19 10:17 PM
eplusz
General Rotary Tech Support
15
10-07-15 04:04 PM
Jetlag
3rd Generation Specific (1993-2002)
4
09-29-15 06:52 AM


Thread Tools
Search this Thread
Quick Reply: Portmatching FC LIM to FD UIM


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: