[sedanman]

figured instead of starting a million threads that have "been covered a million times.SEARCH!" i'd just start one thread and keep all the turbo questions i come up with in here.

first one:maf:draw through or blow through?

second one: if the oil feed line that came stock on the turbo doesn't have a restrictor on it is it okay to just use some feed line for tht turbo or should it have a restrictor? (garret tb035h)

third one: as long as the turbo's oil drain is higher than the oil pan it will drain correctly, right? (this one is more pointed at alex because he knows EXACTLY where my turbo drain is.)

check a once over on my planned setup just to make sure i'm not missing nything:

t3 (aforementioned turbo)w/threaded wastegate so i can adjust the boost, but i was aiming for 6ish? (have ready access to e85 if needed)

custom manifold

2.5" downpipe

12:1 FMU

oil feed w/restrictor&drain to pan

intercooler 2" hard piping

stock ecu

1.9 injectors,1.9 maf(higher flow housing), 3.8 tb, portmatched intake mani.

missing any important details? leaving anything out that someone might want to mention?hoping to go MS sometime in the future to address the ecu/fuel bottleneck issue.

-Nick

 

[Jeffescortlx]

yes the oil return has to gravity drain into the pan, above the oil level so it has no chance to back up in the line.

6psi with a 12:1 FMU should be fine. Dont even need a intercooler, or any e85 for that. Might want to use 91 octane and a set of colder plugs.

An oil restrictor will be a good idea. Unless you want to take a chance on blowing oil out your exshaust and into your intake.

100% of OEM turbo car's that use a MAF allways have draw through. I'm sure they have a good reason for doing so. I would think it is to keep the MAF sensor clean. Between the turbo and the PCV system, it will eventually coat the charge pipe, interooler and intake mani with a thin coat of oil.
People use blow through so they can vent there BOV. I've heard blow through will work fine, but never tried it my self. I recuirculate my BOV.

What are you gonna use for a turbo manifold?

 

[sedanman]

right now i have a drilled dsm but i'm going a different route. i'm thinkin shorty mani with t3 flange or stock mani with t3 flange.
you say 6 should Be fine. what about 8? because then i could leave t.he wastegate stock. :]

 

[Jeffescortlx]

Just keep in mind it's hard to make a weld reliable on cast iron.

It'll ping at 8psi unless you run e85 with some larger injectors.

 

[escortrestorer]

100% of OEM turbo car's that use a MAF allways have draw through. I'm sure they have a good reason for doing so. I would think it is to keep the MAF sensor clean.

From what I recall, that is 100% correct.

 

[sedanman]

okay. larger injectors... 2.0 with rail?bolt in?can't remember atm.
wasn't planning on welding to cast. i know that's a pain.gonna leave first joint then weld to that pipe. :]

 

[alxdgr8]

Yeah, definitely use some 2.0 injectors..should bolt in fine, although I think I remember there being two different sizes (short and tall). Jeff?
1.9 injectors will max at like 3psi.
Use the 1.9 rail, the 2.0 rail (97 retun style) doesn't fit with the 1.9 intake manifold.

Oil drain is fine on that pan, never had a problem with it.

Definitely want some kind of oil restrictor...search for some size to use as I don't remember off the top of my head.

Make sure you have the 93+ MAF, or 2.0 MAF will work too.

Draw thru you have to recirvulate your BOV.
I've always run blowthru and never had a problem. Make sure to have a good catchcan and you shouldn't have any problems with the sensor getting oily. It would still be a good idea to clean the MAF sensor...every oil change (3k miles) should be fine.

 

[Jeffescortlx]

The 2.0 SPI injectors wont just bolt in because of the shorter length.
Zetec injectors should. But, with 6psi a 12:1 FMU should be fine with a completely stock fuel system.

You dont have to have the larger 93+ MAF. If you have the smaller 91-93 MAF it'll work for now, later down the road you can upgrade.

 

[Onegimp]

Just keep in mind it's hard to make a weld reliable on cast iron.

I did it just fine with an ARC welder and the right rods.

 

[ciento44]

The MAF may depend on car....

I'm draw through on my MX6, and i've vented to atmosphere through a Greddy Type S, and i have no stumbling issues at all, and KNOW that sumbish is working, because it's STUPID LOUD.

1) Draw through
2) Oil restrictor is going to be needed
3) gravity drain. Just don't put any loops or anything in it, and you'll be fine.

Let me know when you're ready to piece everything together, i'd be glad to help out if i'm not working.

 

[mindriddle]

The reason for recirculating a bov with a maf is due to metered air. When you have it set to vent to the atmosphere, you will get a rich condition between shifts. This is because of calculated air not being present anymore (out to the atmospher) thus having the same amount of fuel but less air, which results in having a rich mixture.

Edit. This is true for an afm...most likely the same for maf.

 

[Jeffescortlx]

Just keep in mind it's hard to make a weld reliable on cast iron.

I did it just fine with an ARC welder and the right rods.

Did you pre-heat?

 

[Onegimp]

Just keep in mind it's hard to make a weld reliable on cast iron.

I did it just fine with an ARC welder and the right rods.

Did you pre-heat?

Nope. I can't remember what welding rods I used though.

 

[white-lightning]

IIRC you can braze cast iron and that probably would work for a long time. I'm surprised that you didn't have any cracks Onegimp. Everything I have heard says you must pre-heat cast iron or you will get cracking around the weld when it cools.

 

[sedanman]

i know why it stumbles between shifts when vented.lol i've read a little bit. ;]
isn't your mx6 a vaf ?i don't know much about t.he f2t except that it can Be beast with little work.

 

[sedanman]

zetec injectors being out of... what? boneyard access here so throw me a bone..
i have it already set up to use draw through and everything but i could probably throw the maf in the charge pipe somewhere if i absolutely had to... btw. i switched to the larger maf body a LONG time ago.

 

[Jeffescortlx]

draw through is the way to go unless you want to vent your BOV.

 

[sedanman]

i was gonna... lol but recirc is fine with me. where should t.he recirc point Be? right next to t.he turbo in t.he charge pipe?

 

[wagonbeater]

i was gonna... lol but recirc is fine with me. where should t.he recirc point Be? right next to t.he turbo in t.he charge pipe?

vent from the charge pipe back into the intake between the MAF and turbo.