Front Pipe + Dump Pipe (Before/After Dyno Results) - 203rwkw Stock ECU/Turbo

[DJ_L3ThAL]

my r33 is stock atm except today im installing a K&N poddy, next will be the exhaust, what exhaust would you guys recommend and where should i get it installed ? as i wanna get the best performancew i can get out of a new exhaust except i dont want much noise, jetspeed had a 4" tip that seemed to have a valve u could open and close in it to make it louder and softer which is good for me except i want much bigger than 4" something like 5 or 6"s can any of you guys help me out plz ?

[benm]

5 or 6" ? for the Rice effect im guessing ?

[TomR33]

I've checked my ECU serial number: MEC-R620 A2 5118. The car is 95 GTST but I'm not shore about the A/F ratio, never had it on a dyno.

Tom

[ed]

Originally posted by benm

5 or 6" ? for the Rice effect im guessing ?

Ben, haven't you been told? For each inch over 3" it will give you about 10rwkw gains!!!! :eek:

I'm saving up for a 12" muffler tip as we speak!!!! :lol:

[akeenan]

5 or 6" ? for the Rice effect im guessing ?

a 6' tip wtf?

oh well??

:bahaha:

[Guest INASNT]

you will be placed into the same class at the excel drivers with their huge loud exhaust's if u go with a 6" tip!

[whatsisname]

Why stop @ the tip? Go for 6" all the way through, from turbo back baby

[predator]

just pull the exhaust off completely... or route the dump to the side drag style. no back pressure at all

[Guest INASNT]

Originally posted by predator666

just pull the exhaust off completely... or route the dump to the side drag style. no back pressure at all

better still reroute the exhaust back into the cabin, so u will look fully sick when u r cruising and u will feel fully sick in the car 2!! :lol:

[rev210]

I guestimate the afr based on the amount of timing I can give the thing and the new information provided by the S-afc.

Basically, you need very rich mixtures to enable lots of timing and if you run leaner mixtures (ala my new S-afc) you must peg back the timing. If I had 12's at the top end to begin with then I couldn't lean it off anymore than a few % at light throttle at 5000+rpm (just forget even full throttle). And I certainly couldn't run a base timing of 35deg +. 15 degrees is about it for 12/1 AFRs without some toluene.

[Guest INASNT]

at 5000 rpm i got my s-afc set to -15% or so for a 12.1 a/f ratio

[turbomad]

Rev210 why don't you put the car on a Dyno and set the SAFC up properly, what's all this guessing A/F ratio according to timing crap?

[Steve]

Originally posted by turbomad

Rev210 why don't you put the car on a Dyno and set the SAFC up properly, what's all this guessing A/F ratio according to timing crap?

Its his toy, if he cant play with it the way he wants, why have it???

[Sir R33]

so what have you guys got against the riceboy look, we do own japanese car so why not make our cars look like they should and have the 3 3/4'' exhaust with the huge chrome barrel muffler!!!

[rev210]

turbomad,

Your right the AFR's guessing is crap. I don't give a rats arse what the AFR's are as long as the 'knock' and 'ping' situation is under control and the power is there. It's kind of like the rearwheel horsepower, I don't care to know. It actually won't make my car go faster knowing either. 'Tuning' the thing on a dyno makes a case for knowing but since I have yet to do so....

BTW,are you so sure I haven't set it up properly already without the dyno?

I said before somewhere else there might be a little more (5-10HP maybe) I might get out for the dyno time. Dyno time is expensive and tuning the S-afc is pretty easy with the knock sensor read out.

Does anyone remember the days of carby's and jetting? I never once did any 'dyno' tuning for that. I even tuned a Haletch F7B back in the days when it was new, without a dyno.

Tuning 'properly' does not necessarilly = dyno.

[Steve]

Originally posted by rev210

Does anyone remember the days of carby's and jetting?  

Unfortunately yes - got more than a few headaches trying to adjust mixtures on multi barrel carbs, and as for jetting, I dont even want to start...hehehe, that side was a nightmare.

Steve

[dojobi]

I'm sure some people can tune really well without a dyno, but to me it's a VERY handy tool that can save a hell of a lot of effort and produce consistently good results.

[Steve]

MIC33R, you, me and 99.9% of people I would guess

[rev210]

MIC33R,

hear what you are saying. Dyno's are a tool for tuning and like sidchrome sockets and spanners I can't afford one, or afford to use one.

It is possible to get consistant results without the dyno in the same way as many people have got inconsistant results 'with' a dyno.

[dojobi]

I suppose with or without a dyno, in the end it all comes down to the person doing the tuning. I went to Hills in Sydney because they have a good reputation for their tuning and they don't charge too much.