Notices
924/931/944/951/968 Forum Porsche 924, 924S, 931, 944, 944S, 944S2, 951, and 968 discussion, how-to guides, and technical help. (1976-1995)
Sponsored by:
Sponsored by:

Relocating the Turbo on a 951?

Thread Tools
 
Search this Thread
 
Old 12-26-2011, 12:37 PM
  #61  
Paulyy
Professional Hoon
Rennlist Member
 
Paulyy's Avatar
 
Join Date: Jan 2010
Location: Melbourne, Australia
Posts: 7,090
Likes: 0
Received 4 Likes on 4 Posts
Default

Originally Posted by Emily750
The turbo design on this car is horrible. 5 feet of header piping = major lag. Turbos can take the abuse from heat. My Evo 8 turbo is the same size as the 61 in my 951 and has no lag.
well remember the differences of the evo. it can breathe easer, thus more exhaust gasses. compression ratios? computer mapping. 2d vs 3d ect.

the only insufficient part of the design is that wind drags on the x-over and cools it down, but can be fixed by making the fuel burn hotter.
Old 12-27-2011, 12:19 AM
  #62  
M758
Race Director
 
M758's Avatar
 
Join Date: Aug 2002
Location: Phoenix, Az
Posts: 17,643
Likes: 0
Received 8 Likes on 7 Posts
Default

Originally Posted by David.N
I am a mechanical engineer. I am not saying it is better then new technology, If you are an engineer then you should know that everything has to work together. In the case of the 951, it is just fine on the other side and was well designed to be on that side for a reason.

All cars have problems, Forums are going to be obviously only about these problems. These cars I have found to be very reliable. I know guys with 25 year old cars with half the mileage of mine (240,000) that struggle to stay on the road.
I am engineer and the turbo placement was a compromise like any other engineering task. Power was needed, but lowering the heat at the turbo was critical to ensure reliability in the market were turbo were newer technology. Now 30 years later turbo technology has improved.
Old 12-27-2011, 09:17 AM
  #63  
67King
Race Car
 
67King's Avatar
 
Join Date: Apr 2009
Location: Knoxville, TN
Posts: 3,641
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by M758
I am engineer and the turbo placement was a compromise like any other engineering task. Power was needed, but lowering the heat at the turbo was critical to ensure reliability in the market were turbo were newer technology. Now 30 years later turbo technology has improved.
+1. The drawback is lag. The benefits are two-fold. First, as mentioned, reliability. Prior to 951's, I was into Ford 2.3 Turbos. They were mounted on the exhaust side, and probably 75% of the older turbos I came across had cracked housings. Some horribly. The other thing is tuning on the exhaust side, the benefits of which are enormous. Good aftermarket headers almsot always add runner length to improve tuning. The crossover pipe is pretty disappointing to me, compared to what it could be, but it isn't all bad.



Quick Reply: Relocating the Turbo on a 951?



All times are GMT -3. The time now is 09:18 AM.