s-thetikz

iTrader: (1)

ive already used the search function, but could not get answer.

is it possible to turn off both turbos completely and turn them back on electronically ?

and also is it possible to turn off the secondary turbo in a sequential FI system ?

or would you actually have to manually pull it out?

thanks for the help guys

eugene

odditysmurf

Hrm well i guess you could if you had an electronic waste gate then you could manually turn them onto or off of boost. the turbos will never actually be "off" since they will spin a little for ambiant airflow. they just would not pressurize the intake piping. im not exaclty sure if this helps at all. just curious why do you want to turn your boost off?

Wargasm

To turn them off, just don't floor it.

Brian

T88NosRx7

iTrader: (1)

just out of curiosity, why would you want to do that?

spoolage

iTrader: (2)

yes. thre is a way, but you need a new wastegate.

the stock wastegate opens at 10psi get one that you can set and ur good

spoolage

iTrader: (2)

maybe if you could find a really tiny actuator that lined up w/ the W/G ??? I dnno

Cihuuy

Presummably by using the powerFC, and lower your boost??

I think it is a pretty good idea if you can do this... like when you service your car and you dont want the mechanics to screw the car?!? or when your dad, who has a heavy foot, borrows ur car?!? hehehe

RonKMiller

Hmmm, I would think that by pulling a couple of vacuum lines off the wastegate actuators you could do the deed without hurting anything, and you would still have 180 or so horsepower to fool around with.

Bingo, a 300,000 mile FD3S!

rynberg

You can't "turn off" the turbos....the turbine is always exposed to exhaust flow and will always spin the compressor wheels. With the stock wastegate, you cannot boost less than 7 psi.

If you want to avoid sending pressurized air into the intake, you will have to do as RonKMiller suggested and mess with a few of the vacuum lines.

Why do you want to do this?

rotarypower101

iTrader: (1)

Couldn’t it be useful for people that have to do emissions?

Luckily I don’t, but have wondered if that specifically could be done to pass the car.
(I have heard the stories of the techs flooring it into boost and the car not passing because of it regardless of requests not to)

Would it require any manipulation of the fuel map to essentially make it a N/A FD

Wargasm

If you REALLY wanted to make the car N/A for some reason, you could simply unhook the intercooler hose, put a generic air filter on the end facing the engine and that way, it would not be possible to build any boost. It would just have a HUGE 3 inch diameter boost leak

Brian

racer1

well...you can lower the boost instead of turning them
completely off.

But why would you want to turn them off?

fd3virgin

he can't handle the boost...................................lol

hypntyz7

You all are forgetting about something. If you remove the turbos from the intake pathway, they're still being driven by the exhaust. So then, if you floor the throttle, or even partially, the turbos are still being driven as normal. Whereas before they were put under load by pressurizing the intake, now they are not, the pressure is quickly shot out the intake piping. What does that mean? Youre overspinning the turbos badly. Can you say bad turbo bearings?? plus, it'd be loud as hell when you were slightly on throttle, from the air rushing out into the engine bay.

chris406

YOU are all forgetting one very important thing.
The easiest way to turn off the turbos is to trade my buddy the car in question for his 91NA, this is the only way I can see the turbos being turned off.
If you're interested PM me, I can hook you up.

flunkysama

iTrader: (4)

Actually, A switch for valets or "friends" you don't trust with boost may not be a bad idea.

On a 93, you can remove the wastegate pill and dramatically lower max boost. You can lower boost even more by plugging the host running from the wastegate actuator.

A ghetto mod would be clamp the wastegate actuator rod with small vise grips when to hold it in the open position.

If you need something that you can switch from the dash, you will need to fab some cable or linkage hooked to the wastegate rod, some brackets and a solenoid or actuator with several pounds of pull for almost an inch. It would be non-trival but not a major project.

rynberg

Doing so will only lower max boost to 7 psi. It will also increase spool time. This is the same thing as turning an electronic boost controller off.

I notice the original poster hasn't replied with the why yet....

s-thetikz

iTrader: (1)

i dont know for sure, its only my hypothesis,

but i would want to turn them off to save gas in daily commutes and put more life on the engine. also, wouldnt that help with cooling the car, since it isnt so highly pressurized when running ?

thanks for your info .

rynberg

This isn't the car to buy if you are worried about fuel economy or engine life.....

For your purposes, buying an electronic boost controller would be best. You can turn it off to run a slow-spooling 7 psi max and then turn it back on to run whatever boost you want. And yes, running less boost will make the car run cooler but only if you are in a situation where you are constantly on boost (like on the track).

RonKMiller

You can stay out of boost every day easily by keeping your lead foot off the gas - this will also improve your fuel mileage dramatically...

But that wouldn't be any fun.

I think if you lived in a really hot summer climate (like Tucson) and disabled the turbos during that time it could certainly help keep you from pinging an engine during - shall we say - an errant moment.

If you want your engine to last a long time change the oil every 1500 miles or as soon as it starts to look dirty, stay out of the radical horsepower mods and work on cooling improvements from every angle you can.

And don't forget the most important cooling mod: adequate fuel supply - that means a clean fuel filter and decent a/f ratio.

s-thetikz

iTrader: (1)

well if i wanted to purchase a car with high fuel economy and longlivety i would just consider getting a civic. i was just wondering this because if there was a way to do all of the things i hoped it would go a long way for FD owners and their problems.

just my two cents.

ZoomZoom

iTrader: (2)

You can use a pop off valve and set it to bleed off any boost built. it wont create drivability issues as opening up the intake track and leaving it open. It also wont build vaccum or run right. But you can set a pop off valve for any posative pressure. It will bleed it off. Also used to save motor from overboosting turbos when set at max boost you want to run and if for some reason the wastegate fails or with cold weather instead of the added boost going to the engine it will bleed off into the atmosphere. You can also ajust it as needed.

rx7lover0147

a long screwdriver would work just shove into intake side lol. j/k

911GT2

lol, that was my idea

diablone

iTrader: (2)

Find a different vehicle better suited for you. The RX-7 sure isn't at this time.