variable geometry turbo
02-07-2006, 02:30 PM
#1
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variable geometry turbo i search on this site and didnt find a single hit. i was looking on ebay for a turbo for my datsun with a 5.3l lm7 sbc gen III engine. i came across this:
http://cgi.ebay.com/ebaymotors/GARRE...spagenameZWDVW
i did some research on variable geometry turbos but did really find any running on a gas engine. is there a reason for this? the VGT seems like a good idea that would work well. i was seriously considering purchasing one of these turbos.
aslo does this turbo hook up like a regular turbo....meaning does it have a wastegate like a normal turbo. what would i have to connect to make the VG feature work?
http://cgi.ebay.com/ebaymotors/GARRE...spagenameZWDVW
i did some research on variable geometry turbos but did really find any running on a gas engine. is there a reason for this? the VGT seems like a good idea that would work well. i was seriously considering purchasing one of these turbos.
aslo does this turbo hook up like a regular turbo....meaning does it have a wastegate like a normal turbo. what would i have to connect to make the VG feature work?
02-07-2006, 03:23 PM
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Varaiable vane is alot more complex then what is needed for our size engines. Also that turbo hp rating is wrong, and the compressor map they are linking it to is not the correct one. If you match the turbo correctly to your engine, then lag is not an issue.
02-07-2006, 04:49 PM
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02-08-2006, 07:02 AM
#5
speak to baldturbofreak on www.corvetteforum.com
he has done a lot of reserch on them and even put one on his scooby!
thanks Chris.
PS, they are a good itea though and porcshe is using them on the new 911 turbo!
he has done a lot of reserch on them and even put one on his scooby!
thanks Chris.
PS, they are a good itea though and porcshe is using them on the new 911 turbo!
02-08-2006, 09:55 AM
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Originally Posted by jonus079
02-09-2006, 12:58 PM
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Originally Posted by chuntington101
speak to baldturbofreak on www.corvetteforum.com
he has done a lot of reserch on them and even put one on his scooby!
thanks Chris.
PS, they are a good itea though and porcshe is using them on the new 911 turbo!
he has done a lot of reserch on them and even put one on his scooby!
thanks Chris.
PS, they are a good itea though and porcshe is using them on the new 911 turbo!
Crap...you shouldn't have told me that when I'm ready to rebuild mine eventually...
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02-10-2006, 07:03 AM
#9
yeah they are comonaly used on diesel engines. there was a thing about EGTs of petrol engines hotter and casuing the oil to thin reducing responce and even causing the turbo to spool slower! diesels dont run as hot EGT so they get away with it.
but i think alsot of these early problems have been solved and with newer electronics i dont think this will be a problem!
Chris.
but i think alsot of these early problems have been solved and with newer electronics i dont think this will be a problem!
Chris.
02-19-2007, 08:56 PM
#11
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VNT Turbo I will be replacing my GT42 with a VNT GT42 over the next couple months (need to redue hotside piping to fit T6 flange). I am also installing LQ9 heads and patriot dual springs (I had valve float issues), and want to install a MS system. I have already rebuilt the vane control to fully open ~10psi (theory says I should not need a wastegate). Once i have a little more progress (actually start the hotside build) I will take pictures and post results. I got the turbo from a "friend" at Garrett (in case you are wondering).
I spoke with him about the install, he put one on a GN over a year ago (~30,000mi) without problems (gas temp thing may be a myth). His car will not build boost at idle just sitting there, but WILL build boost (~5psi) without any engine load by simply opening the throttle body in park. (His vanes fully opened at ~20psi). I do not know about everyone else's car, but mine will not build boost now without engine load, I am hoping the VNT will work as well for me as it did for him.
I will start a thread once significant progress gets done.
I spoke with him about the install, he put one on a GN over a year ago (~30,000mi) without problems (gas temp thing may be a myth). His car will not build boost at idle just sitting there, but WILL build boost (~5psi) without any engine load by simply opening the throttle body in park. (His vanes fully opened at ~20psi). I do not know about everyone else's car, but mine will not build boost now without engine load, I am hoping the VNT will work as well for me as it did for him.
I will start a thread once significant progress gets done.
02-20-2007, 01:41 AM
#12
Originally Posted by bigturboz28
I will be replacing my GT42 with a VNT GT42 over the next couple months (need to redue hotside piping to fit T6 flange). I am also installing LQ9 heads and patriot dual springs (I had valve float issues), and want to install a MS system. I have already rebuilt the vane control to fully open ~10psi (theory says I should not need a wastegate). Once i have a little more progress (actually start the hotside build) I will take pictures and post results. I got the turbo from a "friend" at Garrett (in case you are wondering).
I spoke with him about the install, he put one on a GN over a year ago (~30,000mi) without problems (gas temp thing may be a myth). His car will not build boost at idle just sitting there, but WILL build boost (~5psi) without any engine load by simply opening the throttle body in park. (His vanes fully opened at ~20psi). I do not know about everyone else's car, but mine will not build boost now without engine load, I am hoping the VNT will work as well for me as it did for him.
I will start a thread once significant progress gets done.
I spoke with him about the install, he put one on a GN over a year ago (~30,000mi) without problems (gas temp thing may be a myth). His car will not build boost at idle just sitting there, but WILL build boost (~5psi) without any engine load by simply opening the throttle body in park. (His vanes fully opened at ~20psi). I do not know about everyone else's car, but mine will not build boost now without engine load, I am hoping the VNT will work as well for me as it did for him.
I will start a thread once significant progress gets done.
thanks Chris.
02-20-2007, 10:38 AM
#15
Originally Posted by flash12t
02-20-2007, 12:23 PM
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How hard could it really be to program something like that into an ECM? I have no experience myself, but it doesn't seem like it would be any more complicated than retarding timing for nitrous/boost or controlling a fuel curve.
Now thats interesting... I thought that real boost only comes around when the exhaust gasses are hot enough (a result of the engine being loaded) to really move the turbine... I don't really see where VG would affect that...
Originally Posted by bigturboz28
...WILL build boost (~5psi) without any engine load by simply opening the throttle body in park.
02-20-2007, 12:33 PM
#17
Originally Posted by A-man930
Now thats interesting... I thought that real boost only comes around when the exhaust gasses are hot enough (a result of the engine being loaded) to really move the turbine... I don't really see where VG would affect that...
Got it
02-20-2007, 06:46 PM
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ECM feedback You do not need ECM control, the reason they are going to ECM control is so that they can meet the new emissions requirements. For all out power (you know so bird fall out of the sky and trees die as you by), a boost referenced vane controller is just fine.
02-20-2007, 08:51 PM
#20
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