NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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-   2nd Generation Specific (https://www.nopistons.com/2nd-generation-specific-17/)
-   -   new! need a bit of help (https://www.nopistons.com/2nd-generation-specific-17/new-need-bit-help-71467/)

defprun 01-21-2009 09:16 PM

Hey thecrow, you have one or two extra of those wheels you have?! They look EXACTLY like the ones on my car...previous owner threw away one of the wheels that were cracked.

thecrow 01-22-2009 07:04 AM

nah dude i dont https://www.nopistons.com/forums/pub..._DIR#>/sad.gif i wish i did lol. but THANKS EVERYONE and Rob X-7 car started last night!!!

i got a little vid.

http://vimeo.com/2916219

it wont idle on its own. im thinking its because all emissions are removed and i did the tb mod. tonight will be spent dialing it in.

Rob x-7 01-22-2009 08:58 AM

clear it all out and then put the fresh plugs in.

Dont try to clean the plugs you have, I tried that once and the car ran worse.

Fastenough 01-22-2009 08:58 AM

There ya go! You picked the worst time of the year to fire one off at least temp wise and don't forget change that oil.

thecrow 01-22-2009 09:36 PM

yeah, i got a small oil leak somewhere. so ill gotta fix that but new oil in tomorrow and just got the new plugs

RicerJ 01-23-2009 03:48 AM

check the oil pan gasket (idk if they have a top gasket set for these or not)

Rob x-7 01-23-2009 08:43 AM

first place that usually leaks are the o-rings under the oil filter

Fastenough 01-23-2009 09:22 AM

Look at oil pressure sending unit and oil cooler hoses and did both copper washers get on the banjo bolt on the one line? As well as the "o" rings mentioned

thecrow 01-24-2009 09:25 AM

i'm making an exhaust from the manifold back. no cats, no resonators. still going the dual tip style. what size pipe should i use? i heard 2.5 was the biggest youd want to go n/a. whats your thoughts?

Fastenough 01-24-2009 10:40 AM

Well I am sure this is going to upset a few people here, but really your not going to accomplish a whole lot performance wise. Sure opening up the intake and exhaust will help but, too far and the car will loose drivability and power on the bottom end as well as the top end. You have a limited ability to tune an N/A those injectors and the stock ECU are limited at best. And that's old tech compaired to todays systems.

Turbo cars have back pressure just because there is a turbo in the exhaust path and reducing intake or exhaust resistance allows the turbo to spool faster, but there is back pressure. Anyway this is why the turbo cars run the larger pipes and less of a muffler.

N/A motors require back pressure too! Only wide open throtle will an open tuned system help power. Now to produce torqe and that's what starts the car in motion not horse power ya need some of that back pressure. First off look at the stock exhaust manifold it's a chamber not a header or even close. I think it is also used to retain heat as well as cut sound. People wrap headers and pipes now because it retains the heat help scavage the spent gases. Keeps the turbo hot on turbo cars. Anyway it not a DIY project.Even for a professional in shop equipped with a hydraulic pipe bender, welder etc. Get a header wrap it,keep the pipe size modest 2 maybe 2 1/4" and use a resonator in place of that cat and a couple low restriction type mufflers. Hey and too much noise will only attract the guys in BLUE. I am sure some will disagree but there ya go.


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