MiT5005

Alright so I just got a '93 FD Sunday from this auto mechanic guy who specializes in rotaries. The engine is completely rebuilt and is street ported with an Apex exhaust system.
But there are some things I have questions about. For one, the guy said that after I break it in a little (after the first oil change he said), I should start mixing some 2-stroke oil into the gas everytime I fill up. Is this normal?
Second, when I am going through the revs, there is a point where the boost drops 3-4 psi for a split second and then goes back to normal boost. Is this something that needs to be fixed or is it normal?
And lastly, I dont have much knowledge about exactly how turbo systems work, only the basics. And I really would like to put after market BOV on it; my question is, since it is twin turbo would I need 2 BOV's or just one?
Any help would be appreciated.

87ZoomR

you only need one BOV...i dunno what two would do, but you wouldnt ever really put two BOV's

moconnor

iTrader: (14)

FDs need at least six aftermarket BOVs to operate properly.

Seriously, why do you want to put aftermarket BOVs on it? Stock system works perfectly and does not need to be upgraded. Read the stickies at the top of the page for your other questions.

Pressurized

the 2-stroke oil i just an added precaution for the motor, you don't need to run it all the time, it helps break up carbon and does other healthy things for the motor. i put some in about once a month.
the boost pattern you are talking about should be a good sign, the stock pattern is 10-8-10...during the transition from turbo to turbo there is a slight drop in boost.
as for the BOV, you only need one, but you should just save your money for now and vent the stock one...you'll still get the cool Psssshhh noise for a lot less

congrats on the purchase!

wtgator69

You dont need to put 2-stroke oil into your engine, but a lot of guys do it. It just helps your engine run a bit smoother and last a bit longer as far as I know, I dont do it so I cant really help you there. Also, when the boost drops 3-4psi that is at around 4000-4500 rmps when the car switches from secondary to primary turbos, this is becuse it is a sequential setup, so you only use one turbo at a time. You can get rid of this by going non-sequential, which a bunch of guys do, but if your unfamiliar with the car I definitely would not reccomend it. It is perfectly normal however. You dont need two blow off valves, you only need to replace the one that is coming out of the Y-pipe in order to hear it. You can also just vent it. Do a search in the forum about this, you will find plenty of information. Use the search button for all of these questions actually, the search button is your friend. Good luck with the car! Sounds nice!

adam c

iTrader: (2)

Wow, an expert!!

Primary turbo works at low rpm. At 4500, secondary turbo kicks in under hard acceleration. At that point BOTH turbos are working.

Aftermarket blow off valves provide ZERO performance gains. They are noisemakers, and are a waste of money.

MiT5005

Hmm thanks for the info guys, I was only asking about the BOV cause the one I could see looks like it was old and rotting away. But I guess I know now that I only need one. So I guess everything seems to be okay with my car so far, thx again for the info again and I'll definitely treat it with care.

alberto_mg

actually, you might want to check with the mechanic you bought the car from why he says to use premix. it might be b/c you don't have an oil metering pump.

make friends with the mechanic in case you ever need him

check out the FAQs also as there is lots of good info in there and links to sites with lots of info about the car.

skunks

you do need 2 bov's in order for the stock twins to operate correctly although you only need 1 modified/aftermarket bov to get the noise. actually you dont need any aftermarket type and you can easily mod the stocker to be quite loud.

skunks

its his money, let him choose to spend it how he likes! gees, what gives you the right to control how he mods his car?

personnaly i dont have the cash for aftermarket bov's and my stockers work just fine so i choose to modify my stock bovs. if i did have the cash though and like the sound of a specific bov, I would suggest to get it. i mean why the hell not

Montego

iTrader: (1)

I have a problem with this:

That means that you are seriously boosting an engine that your mechanic told you to break in. For you to hit 3-4 transition boost drop you are not only at WOT but also are past 4500 RPMs

adam c

iTrader: (2)

Offering opinions and advice is the whole point of this forum. You should have figured that out by now

dubulup

it should only drop 2 psi...you could probably adjust your precontrol arm to spool the secondary a bit more. But I don't recommend ******* with things you don't understand, search and read this forum. You will learn a lot faster than you think.

BigBoosting

Ummm, you shouldn't be boosting if the engine isn't broken in. Not the best idea in my humble opinion. And I would also stay under 4k RPMs

wtgator69

yeah, my bad mr. expert... mixed up primary and secondary, and I actually wanst aware both were on at the same time... learn somethin new every day.

MiT5005

Well the engine is not brand new, its just rebuilt. And I know the guy pushed it hard a little too. He races a 7 second 1st gen so I would assume he knows what he is doing. But I don't know, I think i'll take it slow for a little bit.

BigBoosting

Yeah you're supposed to go easy on rebuilt motors for about the first 2k miles. Gives time for the seals to seat right. And if you aren't premixing and have no oil metering pump...then I'm surprised it's still running to be honest with you.

7racer

you have a boost guage right??

You also might want to get list of ALL of your mods from your mechanic incase there is a midpipe or other things on your car that you should be aware of.

skunks

saying that there isnt any performance gain (well at stock boost levels or if your stock bov is working correctly) is fine becuase thats giving him insite since he is a newbie; he did say that "I really would like to put after market BOV on it" so saying not to get one isnt really an opinion which would help him out very much.

its kinda like bagging on someone for getting a new bodykit or liking a certain type. its a personal prefence and if it makes him happy, thats the only thing which should matter!