FD Rey

Well, after a month of not having my car because of a wreck, it looks as if the second turbo is blown. On my way home I boosted till the second turbo kicked in and it felt great. Later on my way home I try boosting again, and the first turbo was fine, but the second one wouldn't boost when it was time for it to kick in. It felt like it was fluttering, and not boosting at all. Does this sound like a blown turbo? If so, where can I get a new set of twins, and how much would I be looking at in spending to install them. Thanks.
Rey

wrankin

Well, I thing that you don't need to jump to the blown turbo conclusion quite yet. I would first check the arm on the turbo control actualtor and make sure it hasn't detached itself. Then get a vac gauge and check the line feeding the actuator.

It's more likely that you poped a vac line or have lost a solenoid, rather than blew the turbo.

FD Rey

But, would that explain why it worked at first, and it doesn't now?

TWIFOSP

A blown turbo usually works, just not well. Do you have any oil in the engine bay? Excessive amounts in your IC piping? (Some is normal)

Sounds more like a check vavle busted. Do you have a boost guage?

The primary needs to make 8 PSI at least in order for the secondary to even come on. So if you have a vacuum boost leak somewhere and are making under 8 pounds, that is another reason.

Do your standard boostleak/check valve troubleshooting before you talk about blown turbos.

RHarris

The Hose from the cross-over pipe has a crack in it..

The one that goes down to the top of the Y-Pipe... You can't see it unless the system is under boost...

Trust me on this one...

R.

the_glass_man

iTrader: (2)

If you need turbo's I have a low mileage mint set for sale, just click the link in my sig. They are OEM, haven't been rebuilt, etc..

FD Rey

I do have a boost gauge and I boost fine with the first turbo, but the second one boost at like 5psi and a flutters up and down, it doesn't hold or make enought boost.

911GT2

That doesn't work. Then there would be fluttering boost with the primary turbo as well. The pressurized air from both turbos runs through that plastic pipe, so neither would work if it had a crack in it.

Doesn't necessarilly sound blown, more likely a control issue.

cabaynes

iTrader: (4)

sometimes i experience this exact same thing... but other times it works fine.

can anyone give a more clear diagnosis?

r1owner

I'm having this same issue. I ran it at the track the other night and on the last run, the second turbo didn't come on line when I shifted into 4th.

The 1st turbo produces a solid 10-11 PSI up to 4500, then the car falls on its face (0 PSI boost) and I too hear a sort of fluttering noise.

So far, I've checked all the hoses and they appear fine. I've checked the two (valves - solenoids) on the air hose lines and they appear fine as well as the charge control actuator on the second turbo.

I'll keep looking, but I am now a little concerned since all that stuff checked out.

FD Rey

Ok, so it turned out that my turbo actuator had come off since I had no pin on it. I replaced the pin and tighten everything back up. At first everything was working great again. Now, it seems that it does it like every other time. It could work fine first, then the second will flutter and won't boost past like 4psi.

Also, anyone heard anything good about 20b turbos? I have a shop that might sell me a set and I'm seriously considering getting them. Should I stick with some 13b ones instead?