Yebbey Posted February 15, 2009 Share Posted February 15, 2009 I see that everyone recomends fuel pump and injectors to max a vf52. I've also heard that the stock pump outflows the stock injectors. So, would the stock pump and 650cc injectors be ok w/ a vf52? Link to comment Share on other sites More sharing options...
LittleBlueGT Posted February 15, 2009 Share Posted February 15, 2009 I don't think anybody knows for sure. If I were to do it I would run the car in the coldest weather it would see, at the lowest elevation, on E10, and see if it keeps up via logging. If it passed that test I would be good with it. Full tune of 68HTA, KSTech 73 MAF, Racer X FMIC and ID1000s................by the DataLog Mafia!!! Link to comment Share on other sites More sharing options...
mickeyd2005 Posted February 15, 2009 Share Posted February 15, 2009 The stock injectors and stock pump setup is good for about 260 to 265 g/s if you have the MAF scaled correctly. 650 cc injectors with stock pump should be able to work with the VF52. However, I would get a WBO2 and monitor it. You can always dial down the boost to keep the air flow levels low enough. Link to comment Share on other sites More sharing options...
Yebbey Posted February 15, 2009 Author Share Posted February 15, 2009 I don't think anybody knows for sure. If I were to do it I would run the car in the coldest weather it would see, at the lowest elevation, on E10, and see if it keeps up via logging. If it passed that test I would be good with it. tough one being in houston....coldest weather this year is long gone....although, I have yet to purchase the vf52. The peices are coming together. I suppose I'll get it tuned w/o the pump first and see what happens. Link to comment Share on other sites More sharing options...
LittleBlueGT Posted February 15, 2009 Share Posted February 15, 2009 Nice thing about putting in a new pump is you do not have to tune for it. Full tune of 68HTA, KSTech 73 MAF, Racer X FMIC and ID1000s................by the DataLog Mafia!!! Link to comment Share on other sites More sharing options...
testes1010 Posted February 16, 2009 Share Posted February 16, 2009 The stock injectors and stock pump setup is good for about 260 to 265 g/s if you have the MAF scaled correctly. ^This would vary with the fuel you are using. Just over 99% IDC peak I've pulled 284g/sec on non-E10 93 octane. This is 100% stock inlet & stock MAF scalar. Link to comment Share on other sites More sharing options...
Yebbey Posted February 16, 2009 Author Share Posted February 16, 2009 What does that mean? Link to comment Share on other sites More sharing options...
testes1010 Posted February 16, 2009 Share Posted February 16, 2009 What does that mean? on 91 octane(requiring a richer AF mixture) you 'might' peak out in the mid-260g/sec, with 93(allowing for a leaner AF mixture) you might peak out in the mid-290g/sec. Link to comment Share on other sites More sharing options...
Yebbey Posted February 16, 2009 Author Share Posted February 16, 2009 ok, thanks for the explanation. I think that's good for me since I have 93, but I'll have to look up what g/sec means to be sure. Link to comment Share on other sites More sharing options...
testes1010 Posted February 16, 2009 Share Posted February 16, 2009 but I'll have to look up what g/sec means to be sure. g/sec is the amount of air(grams per seconds) flowing thru the maf. The more air flowing(greater g/sec) in the engine to more air there is to consume, potentially making more power(hp). Link to comment Share on other sites More sharing options...
yamie700 Posted March 23, 2009 Share Posted March 23, 2009 See this post, #22. I have 650 dw and plan to use the stock fuel pump. Have to wait a while to see if I get a VF52 or pdx turbo, but I'll know for sure if this works after I get tuned. http://legacygt.com/forums/showthread.php?p=2343084#post2343084 Link to comment Share on other sites More sharing options...
boostsr20 Posted March 23, 2009 Share Posted March 23, 2009 When you plan on getting the tuning? Curious to see the results. Link to comment Share on other sites More sharing options...
mickeyd2005 Posted March 30, 2009 Share Posted March 30, 2009 The 650's may be fine for the stock pump but don't try anything bigger. If you use too large an injectors, it causes the fuel pressure to drop at high flow rates. This causes a kind of step function in the fueling. If you are careful and you have a WBO2, you can do it. I'm tuning some 740cc injectors with the stock pump (owner couldn't get 650cc injectors anymore). Link to comment Share on other sites More sharing options...
boostsr20 Posted May 18, 2009 Share Posted May 18, 2009 Anyone come to a conclusion on this yet? Link to comment Share on other sites More sharing options...
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