InvisibleMonkey

I understand the point of tuning, but i don't understand tuning fully

from what i understand, tuning is pretty much figuring out the best a/f ratio to make the most HP, BUT with a turbocharged car, there is boost, therefore changing the ratio

i guess this would be more for a single turbo setup, but can you set it for example, to say, 25 PSI and tune it, what about if you don't want the power because you just want to drive around without speeding (rarity, i know) and you put it to say, 15 PSI, what would happen to its tune? would it be able to adjust it for the lower boost, or can you have more than one setting?

sorry if it seems stupid, i'm not car illiterate, but i don't know much about tuning

i know in my case, a single turbo FD is a horrible idea as it would be my only car, but i would like to know

2JZ to 13b

ok first of all ima newb on here so take my knowledge on tuning lightly....

tuning in my opinion is not figuring out a/f's or boost levels its deciding how and where ur gonna be driving ur car.....ive experienced ppl tuning cars down here in miami on the street instead of the track and adjusting fuel mixture, boost, and timing accordingly to the level of power they want right in the car because afterall thats where its gonna be driven...know dyno tuning is another beast i mean ive seen cars dyno at 900+hp(Supras) that according to the dyno should theoretically run 8s and 9s in the quarter mile but end up doing high 10s low 11s because its done in a simulated enviorement..

to get to ur questions about boost levels thats what electronic boost controllers are they have hi/low setting and the air/fuel is very important to tuning especially with our rotary engines if run lean will cause detonation and ull be shopping for another 13b and also turning up the boost is the biggest mistake ive seen ppl make without taking necessary precautions such as fuel delivery(upgraded fuel pumps,FPRs,injectors), cooling, and monitoring a/f thru a wideband.....

i also advise againts a single turbo FD as a daily driver as i own a twin turbo FD daily driver and am starting to see why this is mostly a weekend car not to mention the maintaince($$$) it requires as ima 19 year old college student so if ur ina better position then me i saw go for it but just search around on the forums first and see the horror stories before buying anything.....

hope this helps
-danny

InvisibleMonkey

yeah, i've read many horror stories, but i read one story about someoe not having many problems and i get all excited about getting one and not having problems

but thanks, i've always wondered about turning boost low on a car tuned for high boost levels

fastyoungone

yes and no. Heat (among improper tuning) is a killer among rotaries. Taking into consideration that I have done cosiderable work to lower the heat on a 13b, (radiator, fan mod, v mount I/C, turbo rap, etc.) a single can be better in SOME ways, not by any means all ways. But in speaking in terms of heat just doing the single swap alone lowered engine temps(make sure if you do get it ceramic coated). Taking out those water lines running through the twins does make a difference, not to mention it sits farther from your manifolds. also, look at pics of singles, the rats nest is gone, that massive pile of turbo crap isn't there anymore, etc., needless to say much cleaner and simpler to work on, and of course MORE HP!!!!.
But anyway, he's right about the rest. Most boost controllers like the Greddy profec b have a high and low setting, as do most aftermarket computers, make sure that you change both the psi setting and computer setting to match, For example you can't run high boost, on low boost setting on your ecu, probably be too lean, boom!. And if you did it the other way you might foul a plug or just make it not run right. Putting it on a dyno,( I take it that is what your asking about and not steet tuning it) is not only to get your afr's, timing, pulse width and etc right, but also to get the power curve that you want. Like, do you want to scream around town and smoke people throught the first couple gears or do you want a highway beast? It's all preference, but tuning it with an aftermarket ecu is actually the best way to increase your hp reliably. If it was the very first thing that you did to your car you would be amazed at the difference. Tuning it for performance instead of emissions is night and day.