I have a 91TT that is not making boost. I am wondering if I can make a manual boost controller for this car. If not anything, just to make sure my turbos are still good. Would it work if I run a vaccuum line from each wastegate accuator and splice them to a vaccuum source with a MBC? This is how the T3/T4 hybrid turbo is on my RX7. It is pushing around 15 lbs at WOT. I have my eye on a Greddy ProSpec but I want to make sure the turbos are not hurt before I pend the money. I may need it for a new set of turbos.

If this method will not work. Please explain a way I can run a temporary MBC. Thanks for Any helpful ideas!

RUSTYNOGOOD

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LEAD>FOLLOW

 

There is a MBC DIY on a large DSM forum. If you T the wastegate vac line togethere it SHOUDL work, but keep in mind that you want to keep the vacume lines as short as possible as it will be less likely to have issues and a more accurate vacume signal.

.2cents

Berz

 

Yes, it will work. MBC's have a tendency to boost spike on Z's though.

 

I have one more question. Does the vaccuum source need to be suction or pressure? Thanks

RUSTYNGOOD

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LEAD>FOLLOW

 

LOL, Vacume=suck :P So it is a suction source.

 

LOL berzerker=dumbass.. Vacuum lines become pressure lines under boost.

There is only 1 vacuum line that this does not apply to in the Z....there's a nipple in the turbo intake pipe next to the wastegates. Don't use it.

There are turbo feed lines on the black intercooler pipes that are usually used when installing an electronic boost controller. I've never installed an MBC, so I don't know if the same vacuum/boost lines are used.

 

I ran new lines from both wastegate accuators to each side of a Tee. Then the middle line off the tee first to a MBC. Then from the MBC to a strong vacuum source on top of the intake plenium. I opened the MBC all the way. The turbos are STILL NOT SPOOLING!!

I have read in the FSM that in order to check a wastegate accuator you must apply 11-13 psi of "air pressure" and check for movement. If this is the case. Then it would take a pressure line to open the wastegates, not a vacuum source. Where can I tap in on a pressure outlet?? I am confused here!!

RUSTYNOGOOD

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ok.... I have ran the boost feed lines straight from the intercooler piping to my wastegate accuators.... un hooked ans plugged weverything else. STILL NO BOOST!!! Does this mean my turbos are cooked?? If I have to buy new turbos....FINE!!! but I would like to know if the old ones are cooked before I pull them. Is pulling them the only way to check?? It seems to me with them hooked straight to the boost feed lines and they still are not spooling, then they are bad....... alittle direction here please! Thanks

RUSTYNOGOOD

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There's a few things you can do to narrow it down. You can check all your intecooler pipes for oil in them. Also check for blue smoke on startup. If it's possible, you can unhook your exhaust and try to look up the downpipes at the exhaust turbines (mirror and flashlight). That last one was just an idea I made up, don't know if it'll work.

 

No oil in IC pipes and definately no smoke. Not on cold starts or any time. I am at a lose here. Can't seem to figure out what is going on here. I am going to triple check my IC Pipes for leaks AGAIN.But I have not found any reason for the turbos not to work. I have blown three turbos in my lifetime. All of them made a lot of racket and noise before going out totally. Not a sound out of these turbos. Go figure! Thanks for any ideas!

RUSTYNOGOOD

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heres a dumb question..do you think the turbos arent boosting because thats what the gauge is telling you? or is it obviously running like ****...i'm trying to figure how both of your turbos arent spooling, but you have no noise, no smoke, no leaks, etc. hmm i'm not familar with this system just yet to make a good guess.

 

The turbos are definately not spooling. Car idles and runs smooth, but lacks power. And it all started when the radiator blew the plastic header on the pass. side. I thought maybe a vacuum line or something was blown off. But they were all connected upon inspection. Then I decided to run a manual boost controller to "make" the turbos spool. But Nothing! Everything seems to point to the turbos being bad. But with no noise or smoke. I justg dont believe it. Any ideas?? Thanks

RUSTYNOGOOD

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LEAD>FOLLOW

 

As you've discovered, wastegates open under pressure, not vacuum. Like I said earlier,....the vacuum line that you're tapped into becomes pressurized under boost. You're tapped into a pressure line. It's a turbo issue, or a boost leak issue.

I wonder if the exploding radiator hit the IC pipe with such force that it broke one of the end tanks of your passenger side IC, or split one of the hoses that connect the IC to the IC pipes.

 

I am going to try to pressure test the IC's today. I am in process of making a homemade pressure tester. If it works I should be able to test both sides for leaks tonight. My question is this, If one side does have a leak not allowing boost. Would that keep the other side from spooling? Thanks!

RUSTYNOGOOD

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Oh yeah. Here is a pic of my "other lady". Bought her just the way I wanted her......low miler and...BONE STOCK! That way I have a good base starting point to make her what I want. Anyway, Here she is.............

The second pic is of my last project. "Savannah RX-7" She was good to me.... But I have moved on so this one is for sale on ebay http://cgi.ebay.com/ws/eBayISAPI.dll...e=STRK:MESE:IT

.......... Z32TT FOR LIFE!!!
LOL

RUSTYNOGOOD

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LEAD>FOLLOW

 

Quite a collection you have there! I know what you mean about moving on from cars though. I'm starting to hate project cars....(supra for me ) . That other Z looks gorgeous....give us a little more pics and specs if you can spare it. Two TTs! that's awesome!

 

The grey 300zxTT is my new project. The other car is my 88 RX7 TURBO II. That car is for sale on ebay right now and has MANY mods. The RX7 is pushing close to 400HP at the Wheels and only weights 2000 lbs. That car will fly. But I have ALWAYS wanted a z32 since I graduated in 1990. I finally got this one last w/e. Since then I have sold my 69 Chevy C-10 Short bed and now my RX7. Got to get the extra funds for what I am calling "project Z"........ and the wife says some of my toys have to go...LOL Anyway to see my RX7 and all the mods click the link below.....

http://cgi.ebay.com/ws/eBayISAPI.dll...e=STRK:MESE:IT

RUSTYNOGOOD

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No, it won't, directly. The left turbo feeds the right bank. It crosses over through the intake manifold. If the right turbo isn't boosting, then the pressure in the left side bank will be lower; which equates to less exhaust gas. This would cause the boost to raise more slowly. Or at least it makes sense theoretically.

 

Had the cats cut off yesterday. Made no difference. Still have not pressure tested the IC pipes yet. Gonna get on it this w/e. Thanks!

RUSTYNOGOOD

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