I noticed some people were wondering about the design of the head and cat for the r18 and I got a diagram from my dealer for any one interested

 

all diagrams can be find in http://www.hondapartsdeals.com, http://www.hondaautomotiveparts.com, etc... and in almost all dealers web

 

hey R18A1FG, on youre signature it says reprogrammed ECU...what did you do exactly ? and what did it change ?

 

As far as I know my techs at the hodna dealer modified the air fuel mixture ratio and something with the timing using the honda diagnostic scanner after we put my intake in. nothing huge but there was a low end difference and I know that the CAI is not responsible for the difference. The honda HDS has a lot of different things in it regarding the ecu, the technicians I worl with say they really wouldnt screw with it to much more.

 

You're saying they "tuned" your intake at honda?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eL &raquo;</TD></TR><TR><TD CLASS="quote">You're saying they "tuned" your intake at honda?</TD></TR></TABLE>


lol

 

Haha no, basically with the amount of air intake it was getting compared to being facotry suffocated we got it some more fuel, also there is an area in the HDS that has everything about the valve timing for the vtec which they said they were able to advance slightly, and yes this was at honda perk of the job i suppose, they always want to mess with my car so thats fine with me since they are pretty good at what they do, (anyone that cane get a 350 in a fierro making 305 hp can play with my car anyday) and i am fortune enough not to have to worry about my warranty.

 

can anyone tell me what the stock diameter of the downpipe is?

 

COMING OFF THE CAT I DO BELIEVE ITS 3 INCHES NO LESS THAN 2.75