Guest Rolling Parts Posted June 2, 2009 Share Posted June 2, 2009 I have an F54 block with dished L28 pistons/N47 head (8.3 CR) and was looking to draw through a Holley 600 4bbl carb into a turbo on a stock L28et exhaust manifold. I also plan to fabricate a custom curved "Y" adapter to connect the turbo outlet up to to a pair of N33 intake manifolds. I'm looking at the turbo sizer application at: http://www.squirrelpf.com/turbocalc/ and to me it looks like a T3/4 hybrid turbo with 60 trim will be an OK fit for my application to make a conservative ~250hp. Does that look like I'm in the ball park for matching the turbo to this application? Quote Link to comment Share on other sites More sharing options...
evildky Posted June 3, 2009 Share Posted June 3, 2009 a turbo is sized to the motor, the fueling delivery needs to be matched to the turbo, not sure how to size a carb Quote Link to comment Share on other sites More sharing options...
Guest Rolling Parts Posted June 3, 2009 Share Posted June 3, 2009 a turbo is sized to the motor, the fueling delivery needs to be matched to the turbo, not sure how to size a carb That's why I gave all the basic parameters of my setup (and I gave the link where I had already run the engine size, BSFC for a non-intercooled turbo, target HP and had already derived the basic CFM's of the setup to be roughly 580CFM at L28 redline). That's why I also listed the turbocharger that seemed to best be sized and mapped for that application as best as I could tell from doing the math and reading the charts to hit "the island" of best turbo efficiency. From the list of other parts of the project you should also be able to infer that I'm not looking for some kind of a $1,300 turbo... All I'm asking is for someone to check my math and have a suggestion based on experience with one of the now more numerous turbo choices for a modern "Turbo Tom" rat-rodding kind of weekend ride. Quote Link to comment Share on other sites More sharing options...
Pyro Posted June 3, 2009 Share Posted June 3, 2009 The stock turbo can make 250hp. Otherwise, the T04E-50 trim is a better fit on a L28 than the 60 trim. If you plan to use the stock cam them use a stock L28et turbine. If you add a stage 1 msa turbo cam then use a stage 3 or 5 T3 turbine. The turbo will need carbon seals for a draw through setup (gas in the compressor). Another option would be to use a 4bbl intake and make a blow through turbo setup. A draw through will not work well in cool conditions (under 50 F). http://www.squirrelpf.com/turbocalc/graph.php?version=4&pr0=1&pr1=1.07&pr2=1.41&pr3=1.76&pr4=1.76&pr5=1.76&pr6=1.76&pr7=1.76&airflow0=3.1&airflow1=9.5&airflow2=13&airflow3=16.6&airflow4=22.9&airflow5=26.9&airflow6=29.4&airflow7=30.1&product_id=57 Quote Link to comment Share on other sites More sharing options...
dhartig Posted June 3, 2009 Share Posted June 3, 2009 The Turbo Tom setup had a separate chamber at the bottom of the carb adapator housing to flow cooling system water. That was how he prevented icing up on cooler days. At higher boost (I think >8 psi) the meth injection turned on to cool the charge. Quote Link to comment Share on other sites More sharing options...
Guest Rolling Parts Posted June 3, 2009 Share Posted June 3, 2009 Thanks for the note on the seals. Good point to remember when throttle plate is ahead of the turbocharger instead of in it's normal position of being after it. I want a draw through just for simplicity in manifolds and better fuel atomization. The N33's have water heating/cooling lines which is a plus. I thought that the stock T3 was already a "60 trim"? I get different efficiency maps for my application than the T04E-50 (which is what Blue at AtlanticZ recommends as the optimum, but then again he's looking at an L28ET engine). For this application with the calculator, the T04e-60 is showing entirely inside of the 74% range from 13 to 28 lbs/Min flow rates while the 50 trim shows less so. It will probably come more down to easier availability/price that shooting for some theoretical perfection. The stocker T3-60 from a Volvo with a fresh carbon seal kit might just be good enough for the first draft of getting things on the road and interesting.... Quote Link to comment Share on other sites More sharing options...
evildky Posted June 3, 2009 Share Posted June 3, 2009 That's why I gave all the basic parameters of my setup (and I gave the link where I had already run the engine size, BSFC for a non-intercooled turbo, target HP and had already derived the basic CFM's of the setup to be roughly 580CFM at L28 redline). That's why I also listed the turbocharger that seemed to best be sized and mapped for that application as best as I could tell from doing the math and reading the charts to hit "the island" of best turbo efficiency. From the list of other parts of the project you should also be able to infer that I'm not looking for some kind of a $1,300 turbo... All I'm asking is for someone to check my math and have a suggestion based on experience with one of the now more numerous turbo choices for a modern "Turbo Tom" rat-rodding kind of weekend ride. sorry I read the title and saw the flaw, at any rate your turbo selection si the same as any other L28ET, you are just using a carb instead of injection, for 250hp the stock T3 will get you there Quote Link to comment Share on other sites More sharing options...
Guest Rolling Parts Posted June 3, 2009 Share Posted June 3, 2009 Thanks everyone. I just e-mailed the local turbo rebuild shop to see if they had a stocker T3 with positive carbon type seals (or what it'd cost to do the seal swap if I brought one in with regular pressure type seals). I darn sure don't want to suck the engine dry and kill mosquitoes every time I drive w/o boost! There is LOTS of good information around here! Quote Link to comment Share on other sites More sharing options...
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