04-26-2013, 02:24 AM
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#21 (permalink)
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EcoModding Lurker
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Turbo compound, Nice.
That will definitely improve your MPGs.
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04-27-2013, 11:51 AM
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#22 (permalink)
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Corporate imperialist
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I got the T76 in and it will fit where I want it to.
Now all thats left is the fancey plumbing work.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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05-11-2013, 01:52 PM
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#23 (permalink)
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Corporate imperialist
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The second turbocharger is in, now for the testing.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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05-11-2013, 04:18 PM
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#24 (permalink)
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Master EcoModder
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gueff - '19 Mercedes Benz A250 4MATIC AMG 90 day: 30.55 mpg (US)
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with my Acura RDX, i just played with the ECU...I only get 7 psi of boost now vs 14 peak to better match the efficiency map. I don't have the map for it but it looks something like this:
This way i can also run stoich (leaner now) until 3500rpm. Stock car used to enrich mixture depending on how much boost. Ignition has been advanced but that's on the engine side not the turbo. I saw no reason to change out the turbo though, because the stock turbo is pretty good with the variable gemetry design and all. overall though if it was up to me, i would totally just avoid turbochargers. Toyota experimented with that for the toyota prius and in the end they decided to go the NA route.
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05-12-2013, 02:51 AM
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#25 (permalink)
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EcoModding Lurker
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Quote:
Originally Posted by ever_green
with my Acura RDX, i just played with the ECU...I only get 7 psi of boost now vs 14 peak to better match the efficiency map. I don't have the map for it but it looks something like this:
This way i can also run stoich (leaner now) until 3500rpm. Stock car used to enrich mixture depending on how much boost. Ignition has been advanced but that's on the engine side not the turbo. I saw no reason to change out the turbo though, because the stock turbo is pretty good with the variable gemetry design and all. overall though if it was up to me, i would totally just avoid turbochargers. Toyota experimented with that for the toyota prius and in the end they decided to go the NA route.
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Do you have any Before and after MPG comparison? I noticed you only have one entry for the fuel economy log. I like your thinking of just lowering the boost.
This Article in Autospeed.com about Turboing a Prius is quite intriguing.
He did see a benefit from the small turbo.
AutoSpeed - The Story of Turbo'ing a Hybrid Prius, Part 1
Last edited by gil; 05-12-2013 at 02:56 AM..
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05-12-2013, 02:56 AM
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#26 (permalink)
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EcoModding Lurker
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The Following User Says Thank You to gil For This Useful Post:
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05-13-2013, 01:36 PM
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#27 (permalink)
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Master EcoModder
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gueff - '19 Mercedes Benz A250 4MATIC AMG 90 day: 30.55 mpg (US)
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Yes i did keep logs on paper and recipts. I will have to organize them and post on fuelly. Overall mpg improved a lot in city but not much in low traffic highway situations. The biggest problem i face on highway cruising is higher loads due to the all wheel drive and 4000lbs weight. Im thinking maybe a psi or two of boost might help during cruise. We'll have to see.
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05-13-2013, 11:08 PM
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#28 (permalink)
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Corporate imperialist
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Well the second turbo hasn't effected milage that much.
But the intercooler isn't getting much air flow over it at the moment and in my haste I relocated the air cleaner from where it was drawing cool air to where it draws under hood air.
Giving the air cleaner rammed air and more flow over the intercooler should help MPGs.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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05-29-2013, 11:29 PM
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#29 (permalink)
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Corporate imperialist
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It looks like the second turbo and intercooler has improved fuel milage a little bit.
Even with worse cross winds it looks like fuel milage is about 1/2 mpg better over the same up hill 200mile drive.
Testing conditions are so much more consistant on the east coast.
Also the air cleaner is drawing hot under hood air, where the single turbo setup was getting cool air. Diesels like cold air intakes, so long as the intake air is above freezing.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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