924Board.org

[TajMan]

I just got the turbo rebuilt on my '81 931. The thing looked pretty bad when I took it out and it was completely frozen up, wouldn't spin. Now it looks brand new and spins freely with no shaft play whatsoever! I was very impressed. Cost $265 from a place called Hardline Turbo in Salt Lake City, Utah. Was that a good price? Here are some pics:



Bad heat shield that had to be replaced:

Check out the surprise I got when I took the main exhaust off. The cat had been hacked open on the top and completely gutted, then patched and welded back together. Now I need a new one to pass emissions.

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'87 924 S

[numbbers]

As long as your cat passes the visual inspection, you will probably not have any problem passing emissions. These cars run very clean.

Also, $265 is a very good deal on a turbo rebuild. Most run $500 or more.
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1980 924 Turbo

[Joes924Racer]

Yes for 265.00 thats very nice well worth it..
yea thats a old trick gutting the cat before goin to a full flow
and just omitting the cat altogether if you dont have
emissions to worry about.
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1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

[jpab924]

Looks like new! Decent price too.

I`ll take the heatshield thats laying between the cat and wastgage pipe pic if you don`t want it. Yes, I am serious. I really do need one of those...oh wait, I thought this was the parts for sale forum...oops.

[TajMan]

You honestly think I could pass with no cat at all!!! I can't believe that, I know a couple of the emissions they check for would pass, but I know some of them wouldn't. The cat really does do something, no matter how clean and well tuned an engine ran there are some emissions that would be there and not pass without a cat.

As for that heat shield sorry, I think I want to put it back on the car.

I need a couple things before I can put the car back together, two critical things are: a new rubber o-ring seal gasket between the upper intake pipe and the throttle body (note its an '81 not an early turbo with the rubber coupling and hose clamps), and a new recessed gasket between the turbo and the downpipe/cat piece (mine is the 3rd revision of the turbo/manifold that uses the recessed gaskets all around). What's the best place to get these? Do I have to go to the Porsche dealership and what are they going to charge?
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'87 924 S

[kaffine]

Do you know what the smog standards are where you live? What the allowable CO, HC, values are and what else they check?
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80 924
80 931

The best desciption of an atom boils down to something unknown is doing we don't know what.
Sir Arthur Eddington

[TajMan]

They measure HC, CO, NOx.

I've looked all over but I can't find the acceptable levels for each. I know ours aren't as bad as california emissions, but they're not easy either. I'd say they're in between cali emissions and another state thats about in the middle of the scale.
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'87 924 S

[924RACR]

For the seals you reference, I'd suggest trying Jason at Paragon; I've gotten them from my more local supplier, but they don't like to bother dealing with shipping out parts - however, Jason should be just as able to get the parts.
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[Smoothie]

Mine's been able to pass in NJ. It's always a close call on NOx and actually took a few tries this year, but it does get through with a hollow cat.
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"..it's made in Germany. You know the Germans always make good stuff."


'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

[CMXXXI]

[TajMan]

HLT website: http://www.softcom.net/users/hlturbo/2/

There's a phone number in there but they never answered when I called. I think it was just a Vietnamese family, home based business. I just dropped the turbo off in their box outside the house and picked it up when they said it was done, contact through e-mail. I saw a bunch of turbos on a shelf in their garage but I didn't look around for other machines. I don't know if they did everything there or if they outsource stuff. It was fully balanced and it comes with a 6 month 10,000 mile warranty.

As for the emissions I just pulled out the inspection sheet from our '94 oldsmobile silhouette minivan that we just registered. It lists HC, CO, and CO2 on the sheet but I am almost positive they test for NOx too, I read it on the internet and I've remembered them testing for it before.

The sheet says (for 2,500 rpm test):
HC(ppm) standard is 220 (our minivan only put out 8 )
CO% standard is 120 (our minivan put out .01)
CO2% (it just said the % was 15)

I have a friend who owns a mechanic shop where they do the tests. He can't cheat for me and pass it anyway, but he'll just plug the computer in and test the emissions for free to let me know if I'll pass or not. I'll have to see but I think its going to be a close call, barely not passing the NOx.

Turns out I don't need that exhaust seal, I just found the old one and can re-use it.

I'll try Paragon for that intake seal. The only other things I need to get the car running are (if anyone can help or will sell me some used parts):

Lower radiator hose
brake power booster
air filter (I'll get a K&N at autozone)
2 new tires (I'll get some snow tires cause its already snowing here)

What do you suggest I do to the fuel system if the car ran before it was parked but has been sitting for like 3-4 years.?
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'87 924 S

[CMXXXI]

I recommend getting as much fuel out of the entire system as you can before you attempt to start the engine.

Drain the fuel tank. Pull in-tank pump. Pour in some gas to wash out any/all crud that has accumulated down by the in-tank pump. Reach into the hole where the pump goes with whatever you can to clean the "sump" where the pump lives. Clean the strainer on in-tank pump, replace in-tank pump. Put in 3-4 gallons new gas and 1/2 bottle of Techron additive or other fuel system cleaner.

Disconnect fuel feed line at the fuel distributor and put the end in an empty container. Jumper your fuel pump relay and let the pump push about a gallon or so of fuel through the system to flush it.

Then, replace the fuel filter. Jumper the relay again to flush anything that may have dislodged when you replaced the filter. Pull your injectors and push some cleaner through them with compressed air to flush them and check their pattern (replace if necessary). Hook everything back up and see if it will fire up. Unless you have a CIS test gauge, you can't validate the Control Pressure Regulator. After sitting for the 2-3 years, it's quite possible (or even likely) that it has gumme up or otherwise gone bad. Can't tell without the gauge, but won't hurt anything if it is bad - things just won't work properly...

Sounds like you are almost there. Best of luck and keep us in the loop!
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'79 Eurospec 931

[numbbers]

Make sure you have the car as hot as you can get it before the emissions test, and change the oil put Mobil-1 in it. The heat will help the NOX test, and the Mobil-1 will help the hydrocarbons.
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1980 924 Turbo

[Paul]

Mine always flunked with no CAT and premium fuel.

Mine always passed with no CAT and regular fuel.

I have collector plates on it now, NO MORE SMOG CHECKS!!!

[TajMan]