2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

tested 545whp on stock fuel lines with walbro pumps

Old Apr 22, 2006 | 08:02 PM
  #26  
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Originally Posted by jon england
do you know what your leak back pressure is and what the injector flow rating is that you are going to use on the car?.
do you mean the presure in the return line? i dont know i didnt measure this, but cant be a problem since it seems that single stock reg was the botle neck in the sytem causing the uncontrolable high base fuel pressure. i was getting worried that it was the resistance in the return line causing the pressure to spike. but the test proved it was adaquite.

Before the testing and the upgraded fuel system the car was running 2x 680cc and 4x 550cc total 3.5L/min
now ive intalled 2x 550cc and 2x 1680cc total 4.5L so even in this situation i will probable see the injector max out before the pump. I guess the duty cycle i run will depend on the turbo and boost, but i would like to talk it to the max to test the theory
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Old Apr 22, 2006 | 08:08 PM
  #27  
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Originally Posted by BoostedRex
This is a great thread Oliver!! And after you get more testing done, including dyno time I'll be sure to clean up the random posts and put this in the 2nd gen archives! Good on you bro.

Zach
cheers !
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Old Apr 22, 2006 | 08:11 PM
  #28  
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Originally Posted by RXciting
It's coming, slowly but surely. I'm just solving the problems as they come. Turns out the flange was not only the wrong type, but also the wrong size , imagine my face when i tried installing the newly machined flange only to figure out it's a 4".

So when i got home from work I welded the flange I had bought for the downpipe to the housing. Now I just need another flange.

I'll have that turbo permanently installed in that car yet!

I'll let you know how it goes.
ahh that sux! was there not enough meat on the housing to remachine to a 3"?
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Old Apr 22, 2006 | 08:29 PM
  #29  
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Hey smart dudes this may seem like an overly stupid question but im trying to figure out the whole point of this test cuz it seems like your trying to find out what fuel pressure the stock fuel system can handle (with the exception of the fuel pumps). Would that be the right reasoning for your experiment? Cuz i mean how much fuel pressure does one really need other than stock pressure? And does it depend soley on amount of boost your running?

Thanks and sorry for being a noob to this
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Old Apr 22, 2006 | 08:48 PM
  #30  
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the tested was used to determine fuel volume
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Old Apr 23, 2006 | 08:40 AM
  #31  
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Originally Posted by RylAssassin
Hey smart dudes this may seem like an overly stupid question but im trying to figure out the whole point of this test cuz it seems like your trying to find out what fuel pressure the stock fuel system can handle (with the exception of the fuel pumps). Would that be the right reasoning for your experiment? Cuz i mean how much fuel pressure does one really need other than stock pressure? And does it depend soley on amount of boost your running?

Thanks and sorry for being a noob to this
like Driftlanta mentioned above the test was to determine fuel volume at a given pressure. Its easy to flow large volume at low pressure but with boost the fuel pressure will rise 1:1 with the boost increase, and then its more work on the pump to maintain flow at high levels of fuel pressure or line resistance. thats why i did the 65psi tests and measured the flow in L/min
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Old Apr 23, 2006 | 03:12 PM
  #32  
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Originally Posted by bobybeach
ahh that sux! was there not enough meat on the housing to remachine to a 3"?

Possibly, I considered that when i got it at work. But decided it would be cheaper faster and easier to just weld the 3" V-band i had. I'll just buy another one monday.

This way i could alway machine it later, or cut off the flange i welded and make a 4" exhaust
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