sonik

my friend just got a 93 TT with 26k miles on it. The problem is that around 5k rpms when the second turbo should come online it makes a weird noise like a goose got caught in one of the belts. Is this the #2 turbo going out or what? I havent had him pull of ic piping to see if there is oil in there but what else should i look for. I havent ever worked on an rx7 before?

Mahjik

iTrader: (1)

Well, the first thing to help diagnose boost problems is getting and installing a boost gauge.

http://www.scuderiaciriani.com/rx7/b...e_install.html

After that, check the boost pattern using the boost test:

http://www.scuderiaciriani.com/rx7/boost_test.html

That will give a good indication on where to start looking for problems.

Also, is the car completely stock?

Midnight Hour

What Mahjik said. If you're getting a wrong boost pattern it's almost always going to have SOMETHING to do with 1 of the 70+ vacuum lines we have hiding under the hood.

BTW...beautiful MKIV you've got there. Yours is the only yellow Supra I've ever liked.

sonik

thanks guys..he has a boost gauge, dp, exhaust and it hits about 15 psi then all of a sudden it drops to like 2 pounds from 5k on up ??? i looked at the vacuum hose diagram and decided that i wouldnt do that yet..im just gonna unplug another one and see if it stays the same or changes it.

half past twelve

15psi is WAY too much on a stock ecu. Get a boost controller to keep it at 10psi, or else it will be rebuild time.


BTW, awesome looking supra, very clean..

Mahjik

iTrader: (1)

If he's hitting 15 PSI on the stock ECU, then it's fuel cut he's getting (which is not a good thing, but it's saving his engine).

sonik

ah i thought that might be what it was..what do you guys use for that..fcd or bcc or what? what does he need to go with 15psi..

Mahjik

iTrader: (1)

Well, a lot of people are going to disagree on what needs to be added to run 15 PSI regularly. Most people will agree on on at least a few things (added to what the car already has):

Upgraded ECU
Upgraded IC

The fuel system is the part that people will disagree. Some shops/people say the stock fuel system is fine for 15 PSI, some say it's not.

The best way to tell is to get at least those two things upgraded and get the car on a dyno to see what the A/F ratios are looking like (and maybe add a Fuel Pressure gauge to see how the stock fuel pump is holding up).

sonik

after doing some reading it would seem like a good idea to get a alum. radiator, silicone vacuum lines, turbo and intake piping (mandrel bent) ?

Mahjik

iTrader: (1)

The alum radiator is always a good idea.

IMO, if you don't have any boost problems, leave the vacuum lines alone. There is absolutely no reason to change them on a low mileage FD unless there is a problem.

As for the turbo piping, aside from the Efini Y-Pipe, the rest of the piping is really just for looks.