Steven280ZX

so that completes the setup w/ addition of what nismo you said about those studs so i believe i can have a killer engine... have a missed something or is this a working... thing idea?

SHADY280

you wanna see what 9psi of boost does? watch the race car halfway throught this short video, he normally runs 19 pounds, he says its insane, hes got the low cr, so you tell me what you wanna do. it also has to run 110 octane race gas to support the 19 psi, 94 octane for the 9psi

Steven280ZX

so id be runnin w/ 94 octane?

SHADY280

minimum, power doesnt ever have cheap attached to it. 15 cents a liter more than regular, trust me, i know! even after the motor is built, it costs in mpg, and the price of gas.

Steven280ZX

but wen using her as a dd couldnt i just drop the boost down to like 4 or lower to stay at 87? i dont relaly understand how this works in terms of what power to what fuel? can ya help me out?

SHADY280

i think any turbo motor needs premium fuel, now what if say, you turn it up to impress a buddy or chick, and you got the cheap gas in? kaa boooooom. nissan says premium right from the factory, on what, 4-7 psi stock?

Steven280ZX

oh so ur saying i cnt just turn it up randumly then if its at 4 then its gotta stay at 4 till its empty rite? only on premium can i show off

SHADY280

heck, not even show off, let alone go up a hill, oh right your in manitoba. hahaha

Steven280ZX

well heres wut i dont understand... high boost equals high octane levels in fuel so then low or NO boost... yeah cant i turn the boost to 0 then it runs like an na rite? that means 87? or not that easy

NismoPick

Steven... I do not say this rudely, but it sounds like you are trying to be cheap.

Cheap costs more in the end. Just do it right the first time.

Like Shady was sayin... welcome to high octane

Steven280ZX

lol nismo ur rite i was tryin to save a quick buck guess not lol wouldnt welcome me yet until the build is done

NismoPick

That doesn't make sense.

Steven280ZX

can u put boost to 0 which means the turbo is no longer bringin in air at a higher rate?

NismoPick

0 is still boosting.... a naturally asp engine has vacuum of about neg 5-7psi.

Steven280ZX

yikes so explain to me (cuz iv never seen this done bfor w/ mi eyes) how low can u put boost?

Steven280ZX

well i gues wut im gettin at is can u "turn off" a turbo charger and be a cheap kid an put 87 octane? or by doin this increase mpg

NismoPick

Remember what I said a few ago?

Steven280ZX

ok gotcha but can be so bold as to ask u to estimate the worst possible mpg i could get at the lowest possible boost rate?

NismoPick

I get about 15mpg in my 280zxt.

I've heard a lot of people say that MegaSquirt settings do allow for better mpg, but if you're boosting all the time & driving wild, ya gunna get crappy mpg.

Another thing (I don't think you mentioned it in your list) that you need is a good electronic boost controller. DO NOT buy a manual valve.

Steven280ZX

so by cuttin off boost gettin rid of mi heavy foot and megasquirtin i can up mi mpg. any other ways? i no im soundin cheap here but i wanna try for 20mpg cuz if i do a road trip down to hte msa show... yikes ther goes mi university money

NismoPick

Unless you're going up a hill or trying to accelerate really fast, you don't need to "cut the boost." If you're not heavy on the throttle, you're not boosting a lot.

Steven280ZX

aaaaaaaaah thats how it works gotcha!

Steven280ZX

ok so recap: i gotta call wiseco pistons and change mi order to dished and the dish is the same as the stock to lower c/r to 7.4 correct?

veyenyl

Why spend all this money on building a turbo motor then go cheap on the gas? Think of it as insurance for your motor. I'm actually going with flat tops for my built motor for beter quench but no where near 9.5:1. I'm gonna keep it closer to 8.5:1. Tuning is key when running higher than 8:1 on L-motors. Not going for 20+ lbs of boost or peak HP or I would run a lower C/R.

If this is your first turbo motor then you should stick with the stock turbo pistons like already advised. It will keep you out of trouble and your motor will last.

edit: Forgot to add - Read the book

Bleach

Nissan actually says in the FSM I have ( I think it was that or the glovebox book) that the NA and turbo for 1982 run on 87 octaine.

6psi is stock from what I've seen