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??

 

well the 20g has a 44lb min compressor wheel so its bigger than that. is that the sbr10 turbo from garret ????

 

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.

 

spot on, it was the SBR11.....they just seem to be rediculously priced for the performance!

 

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

 

What is the performance ? Is it a claimed (usa) power output or do you have a dyno graph ?

Andy

 

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.

 

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 ?

 

True I know which I'd rather have though

I think it was an early wrx/2.5 conversion on GEMS not sure what else.

 

Andy - that'll be because I haven't got round to replacing the 15ft diameter Uppipe on the GT Spec II headers. I feel this is not helping spoolup.

But it is quick though!
Russell

 

Steve that may be true on engines revving to 8k+ though, im not sure mine iwll rev that high, maybe 7.5k, was advised to have STI5/6 cams put in in place of mine to help enable that....

I did look at the 12 though i have to say....or the GT30R but i wasnt sure if that was rotated or not?

 

What sort of spool does the VF22 have then? 3500 on a 2.0?