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New 993 Turbo...boost issues

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Old 08-31-2017, 04:48 PM
  #31  
PunjabiM3
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Originally Posted by DRPM View Post
A qualified tech can also smoke test the plumbing, which will show any leaks
As others mentioned upgrade the old hoses before the let go.
A little oil carry over inside the boost hoses to the intercooler is normal
You may want to upgrade to installing check valves on the turbo oil feed inlets, check with Turbo Kraft or RUF in Germany.
Good luck and enjoy
Oddly the car only indicated the 0.8 bar boost that ONE day. I have driven the car several times since then and each time it only shows a max of 0.4-0.5 bar boost, and this is with the ambient temps being cooler now by 15-20 degrees F and humidity also around 15% lower. I ended up dropping off the car to a very qualified local shop, and they are going to begin the diagnostics by performing a smoke test. Will keep you guys posted on the findings. I really hope it is not something big. Any thoughts?
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Old 08-31-2017, 05:40 PM
  #32  
chsu74
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Does it run strong? This is why an analogue boost gauge is helpful. Again, digital gauge is not accurate
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Old 08-31-2017, 05:49 PM
  #33  
PunjabiM3
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Originally Posted by chsu74 View Post
Does it run strong? This is why an analogue boost gauge is helpful. Again, digital gauge is not accurate
I would say the car runs fine, but I wouldn't call it strong; it doesn't feel like a car that in stock form could hit 0-60 in sub 4.0s or 0-100 in sub 10 seconds. A friend of mine has a 993TT here in town with over 60k miles, car had top end rebuild done prior to his purchase, and riding in his car, I feel like it pulls much harder than mine. However, cars always feel faster from the passenger seat vs driver seat IMHO. Also, I have a 2017 BMW M3 Competition Package as my daily driver and I can say without a doubt the M3 feels MUCH stronger. I believe it does 0-60 in around 3.8s and 0-100 around 8.5, but I feel that the 993TT should not be noticeably slower, and mine does feel noticeably less so than my M3.
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Old 09-01-2017, 11:17 AM
  #34  
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comparing two very different cars in that manner is tricky.

Its very difficult to read boost accurately when you're on it. In first gear, I don't think I get .8 bar, but as you go higher in the gears, you load the motor a bit more and acceleration is less fierce.

I'd try flooring the car in 4th gear at about 2000rpm and see what happens.

The stock gauge is pretty crappy imho.
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Old 09-01-2017, 12:56 PM
  #35  
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Don't even try and focus on boost in first. Second through 4th, 5th, with even throttle, and keeping it smooth, while trying to stay above 4K. Once you've sorted any issues, you gotta spend some quality time with your car. I have been a bad parent, and had car sit at times. When I get in it, I have to re-familiarize myself, with all the silly little sounds my car makes. Might take an hour, before I relax, and say it's good. Without driving it regularly, I feel it's fairly difficult to discern what "feels normal", unless you're someone who has spent most of their lives, driving 993s.
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Old 09-01-2017, 01:15 PM
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Yup. Easy to hit 0.6 boost in 3rd and 4th. Just need to stab at the gas pedal. You need a nice stretch of road to have boost build up to 0.8
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Old 09-03-2017, 08:20 PM
  #37  
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Originally Posted by chsu74 View Post
There are not many roads where I can peg 0.8 boost for over 1-2 seconds without going to jail so it befuddles me when people here claim to see 0.8 boost comfortably and consistently.

Temporary car/license loss here is about 94 mph. That's around 8 seconds at 0.8 bar......ya gotta not be a chicken
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Old 09-07-2017, 10:41 AM
  #38  
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Dropped off the car to the shop. Car has a hard fault for the frequency valve, so we will be replacing that part and also installing new intercooler hoses (the ones with the orange ends) since the car has the originals. There were no leaks found in the smoke test, but decided to replace those hoses since the ends are starting to tear a bit, even though no leaks at this time. Hopefully this will take care of the issue. Will report back when I get the car back hopefully early next week. Thanks everyone for the help. Hopefully if she now runs as she should, I can start ordering exhaust components and Bilstein PSS10!
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Old 01-03-2018, 08:49 AM
  #39  
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I have same issue with boost. car also not pulling strongly.
Overboosted28. u mention there are 5 hoses to check. i only know of the 2 connecting to intercooler.
whete are the other 3 to check?.
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Old 01-03-2018, 12:05 PM
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Originally Posted by JHR55 View Post
I have same issue with boost. car also not pulling strongly.
Overboosted28. u mention there are 5 hoses to check. i only know of the 2 connecting to intercooler.
whete are the other 3 to check?.
you have two at the diverter valves, and one from the idle air control valve. They all three terminate/connect at base of intake, FRONT of engine (flywheel side), on 3 nipples on intake. These are thin walled rubber hoses, which the ends will most likely be crushed beyond service. I took the three hoses, to try and match with heater core hoses. Found 3 I could cut into the right sizes (bends in similar ares), and got them all replaced for under $40 bucks. Much thicker than factory, and surely will last forever ever. GL
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Old 01-03-2018, 12:22 PM
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Here's a couple pics of examples

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Old 01-03-2018, 12:24 PM
  #42  
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I used some of the extra, I cut off of heater hoses, to re-install diverter valves to intake.

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Old 01-07-2018, 01:36 AM
  #43  
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thanks overboosted28.
do u know the parts number for the 3 hoses. looked at the parts diagram but cant figure out which hose.
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