trims??

joel w · 11-13-2005, 07:21 AM

here are some of the lingo definitions. http://www.turboneticsinc.com/glossary.htm

and some good all round turbo info...
http://www.turboneticsinc.com/faq.htm#turbosizing

dont believe what she says, size does matter..

1988gte · 11-14-2005, 06:34 AM

very intersting. helps me alot. Turbos are different to me. Always have had v-8's "american power" the supra is FUN i love it

joel w · 11-14-2005, 06:47 AM

trim by the way...
i think trim is just the size of the intake wheel diameter? mine was upgraded to 50 trim and the housing was machined to fit the larger wheel..and nothing was done to the exhaust side. i guess the exhaust side mods are not needed untill higher boost levels. 50 trim is good to about 400 hp or 15psi (the sweet spot of the turbo) where it runs most efficiently....bigger hp motors need more air and or lager wheel to flow more air..

1988gte · 11-15-2005, 05:41 AM

is 400 to the ground or flywheel?

joel w · 11-15-2005, 05:51 AM

probably flywheel.. but not sure..

1988gte · 11-15-2005, 06:27 AM

but sill thats lots o power. isnt 15% a general rule in drivetrain loss? still around 340 or so to ground is alot! my mach put 281 stock. with 15% should have been 255-260ish. I think i read in a car magizine 15% was a "general rule" anybody seen or heard of this?

joel w · 11-15-2005, 06:51 AM

15% that sure sounds about right if i was gonna guess

also 50 trim will make 20 psi but i think that at that boost level its working it too hard and starts to create heat and? not to mention you need octane boost for higher boost and more fuel...,, just tell em what you have now as far as mods, and what boost you want to run.. and what your future plans are as far as hp and more mods... hahahha. they will help you deicide whats best for your application...

joel w · 12-05-2005, 10:22 PM

dcrusupra, im not sure how big they can go , sorry.

Quote:

Originally Posted by joel williams

trim by the way...
i think trim is just the size of the intake wheel diameter? mine was upgraded to 50 trim and the housing was machined to fit the larger wheel..and nothing was done to the exhaust side. i guess the exhaust side mods are not needed untill higher boost levels. 50 trim is good to about 400 hp or 15psi (the sweet spot of the turbo) where it runs most efficiently....bigger hp motors need more air and or lager wheel to flow more air..

hate quoting myself, but i posted bad info...

i just found out that trim is just the ratio of the two diameters of the compressor wheel. EXDUCER (big diam.) and INDUCER (small diam) ...trim is how much bite the blades have not the size of the wheel.. to help clearify..

stock ct26 is a 49 trim with 1.75(in) and 2.5 (ex) compressor wheel.
My upgrade is a 50 trim,with 2.25(in) and 3" (ex) compressor wheel. the ratio of the (ex) and (in) is almost the same but the wheel is overalll 1/2 inch bigger than stock diameter..... these measuremeants are not exact but rounded up or down..
ok... sum it up again, a 60. trim on a 3" wheel will grab much more air than say a 45. trim on a same 3" wheel due to the shape of the blades, not the size of the wheel.. but at the same time the 45. trim will spool much faster than the 60. trim its all very complex and mathmatical.. im still learning..

but remember the size and shape of the exhaust side wheel will also make a difference in spool time and flow and power..

hope this help..

1988gte · 12-06-2005, 05:40 AM

great info, i have always wondered about the trim stuff. make lots of sense now

89platypus · 07-14-2009, 06:37 AM

if you get a trim upgrade, do you start running leaner?do you have to get bigger injectors and the lexus afm?

11-13-2005, 07:21 AM	#1
joel w Lexus & 550's Join Date: Aug 2005 Location: In the shadows Posts: 506	turbos.. here are some of the lingo definitions. http://www.turboneticsinc.com/glossary.htm and some good all round turbo info... http://www.turboneticsinc.com/faq.htm#turbosizing dont believe what she says, size does matter..

07-14-2009, 06:37 AM	#10
89platypus Stock Join Date: Apr 2009 Location: wisconsin,USA Posts: 9	if you get a trim upgrade, do you start running leaner?do you have to get bigger injectors and the lexus afm? __________________ 89 turbo supra K&N intake HKS mhg air conditioning delete lowering springs and struts Konig 17" Theory rims

11-14-2005, 06:34 AM	#2
1988gte 3" Exhaust Join Date: Jul 2005 Location: Lubbock Texas Posts: 140	very intersting. helps me alot. Turbos are different to me. Always have had v-8's "american power" the supra is FUN i love it

11-14-2005, 06:47 AM	#3
joel w Lexus & 550's Join Date: Aug 2005 Location: In the shadows Posts: 506	trim by the way... i think trim is just the size of the intake wheel diameter? mine was upgraded to 50 trim and the housing was machined to fit the larger wheel..and nothing was done to the exhaust side. i guess the exhaust side mods are not needed untill higher boost levels. 50 trim is good to about 400 hp or 15psi (the sweet spot of the turbo) where it runs most efficiently....bigger hp motors need more air and or lager wheel to flow more air..

11-15-2005, 05:41 AM	#4
1988gte 3" Exhaust Join Date: Jul 2005 Location: Lubbock Texas Posts: 140	is 400 to the ground or flywheel?

11-15-2005, 05:51 AM	#5
joel w Lexus & 550's Join Date: Aug 2005 Location: In the shadows Posts: 506	probably flywheel.. but not sure..

11-15-2005, 06:27 AM	#6
1988gte 3" Exhaust Join Date: Jul 2005 Location: Lubbock Texas Posts: 140	but sill thats lots o power. isnt 15% a general rule in drivetrain loss? still around 340 or so to ground is alot! my mach put 281 stock. with 15% should have been 255-260ish. I think i read in a car magizine 15% was a "general rule" anybody seen or heard of this?

11-15-2005, 06:51 AM	#7
joel w Lexus & 550's Join Date: Aug 2005 Location: In the shadows Posts: 506	15% that sure sounds about right if i was gonna guess also 50 trim will make 20 psi but i think that at that boost level its working it too hard and starts to create heat and? not to mention you need octane boost for higher boost and more fuel...,, just tell em what you have now as far as mods, and what boost you want to run.. and what your future plans are as far as hp and more mods... hahahha. they will help you deicide whats best for your application...

12-06-2005, 05:40 AM	#9
1988gte 3" Exhaust Join Date: Jul 2005 Location: Lubbock Texas Posts: 140	great info, i have always wondered about the trim stuff. make lots of sense now