can someone decode this techy stuff about a turbo for me?
#1
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can someone decode this techy stuff about a turbo for me?
what does this mean exactly?
700177-0011 CHRA from Garrett
Compressor side:
• 52 trim
• 2.17 inducer
• 3.00 exducer
• 50 lb/min compressor wheel
Exhaust side:
• 2.11 exducer
• 2.22 major
does that mean anything to anyone??
700177-0011 CHRA from Garrett
Compressor side:
• 52 trim
• 2.17 inducer
• 3.00 exducer
• 50 lb/min compressor wheel
Exhaust side:
• 2.11 exducer
• 2.22 major
does that mean anything to anyone??
#3
Neilo,
CHRA is the centre housing rotating assembly, which is the bearing housing, turbine wheel and shaft, and compressor wheel. No housings.
Inducer is the part of the compressor wheel you can see if you remove the inlet pipe, exducer is the part you can’t unless you remove the comp cover. On the exhaust side it is reversed. (Figures are in inches btw)
Trim is the relationship between the inducer/exducer. This determines the shape of the compressor map, a larger trim for the same exducer size = more flow, generally at the expensive of the surge line, however blade design, pitch, tip height and most importantly compressor cover have a great impact in the maps shape and flow characteristics. Trim = (inducer x inducer) / (exducer x exducer) x 100
50 lb/min is the amount of air the WHEEL can flow, ie around 500hp. Hp/ response etc. will depend on what style/size of housings are fitted on each end. Never choose a turbo based on compressor flow alone.
As a comparison a MHI td05h/20g is 2.07 ind, 2.68 exd, 60 trim ~44lb/min compressor side, 2.2 ind, 1.93 exd (or major), 77 trim for the exhaust wheel.
Stevebt,
SBR11 uses the above chra, SBR10 uses the -0010 chra etc. The cartridge is Garrett but the housings are made by Slowboy.
CHRA is the centre housing rotating assembly, which is the bearing housing, turbine wheel and shaft, and compressor wheel. No housings.
Inducer is the part of the compressor wheel you can see if you remove the inlet pipe, exducer is the part you can’t unless you remove the comp cover. On the exhaust side it is reversed. (Figures are in inches btw)
Trim is the relationship between the inducer/exducer. This determines the shape of the compressor map, a larger trim for the same exducer size = more flow, generally at the expensive of the surge line, however blade design, pitch, tip height and most importantly compressor cover have a great impact in the maps shape and flow characteristics. Trim = (inducer x inducer) / (exducer x exducer) x 100
50 lb/min is the amount of air the WHEEL can flow, ie around 500hp. Hp/ response etc. will depend on what style/size of housings are fitted on each end. Never choose a turbo based on compressor flow alone.
As a comparison a MHI td05h/20g is 2.07 ind, 2.68 exd, 60 trim ~44lb/min compressor side, 2.2 ind, 1.93 exd (or major), 77 trim for the exhaust wheel.
Stevebt,
SBR11 uses the above chra, SBR10 uses the -0010 chra etc. The cartridge is Garrett but the housings are made by Slowboy.
#7
SBR11 has made ~440hp on Optimax on a UK based Dyno Dynamics dyno - Probably eleventy billion whp in the US though
The SBR exhaust housing looks more like a 8cm2 - coupled with the 90 trim backward curved wheel and spool will be slower than a 7cm 05h combo.
FWIW a the -12 spools within 100rpm of a vf22, re-spool/response is better.
The SBR exhaust housing looks more like a 8cm2 - coupled with the 90 trim backward curved wheel and spool will be slower than a 7cm 05h combo.
FWIW a the -12 spools within 100rpm of a vf22, re-spool/response is better.
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#8
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Hmm, VF22 isn't exactly a sparkling spooler
I have only experienced the SBR-10 and it was pretty laggy for the flow capacity.
What was the spec on the 440bhp SBR11 car ?
I have only experienced the SBR-10 and it was pretty laggy for the flow capacity.
What was the spec on the 440bhp SBR11 car ?
#11
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Originally Posted by stevebt
neil when i last got emailed from slowboy they advised me to get the SBR12 on forged internals for 2ltr. they said it makes boost really early and is the better choice for an uprated engine
I did look at the 12 though i have to say....or the GT30R but i wasnt sure if that was rotated or not?
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