Big 16g spool characteristics?

[David15151]

Basically my car was supposed to come with a Big 16g when i bought it. I didn't know much about turbos at the time.. but had an idea. I took the intake off the inlet and snapped a pic.

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looks like a 16g right? had a friend look up the numbers on the compressor housing and it matches that of a big 16g. The turbine housing is stepped and unported on its inlet.

Here is what concerns me.. i have like no top end power BUT I did a test today just to check and did a 3rd gear pull I start to spool 1psi @ 1750 RPM and have 15psi @ 2750.. that seems a bit quick dont you think? stock unported manifold.

Is there an actual problem with the car? Or is this maybe a 16g in a 14b housing? or maybe its a small 16g? What are yalls opinions on it? or am I just crazy..

one more thing is the turbine housing looks a lot more worn than the compressor side but that may be normal.

 

[IHeartTurbo]

It's definitely a 16g, no doubt about it. Now, to tell if it's a big or small 16g, you need to take it apart, measure the compressor inducer or exducer diameter and compare those measurements to the ones on vfaq.com


And fyi, a 16g has the same housing as a 14b.

 

[David15151]

to my understanding a 14b has a 6cm TDO5H housing while the 16g has a 7cm TDO5H housing.. thought they were different

 

[David15151]

so i guess no one knows when their 16g spools.

 

[Endz0r]

my big 16g hits 15psi at around 3500rpm

mods are in my profile.

 

[David15151]

So what would cause a turbo to spool up faster than normal.. is there any known problem that could cause it? Or does this mean that this is not a Big16g

 

[Boosted98gsx]

You prolly have a 13g and you dont know it


But really. If it was a big16g you'd see spool up in the 3000rpm range. I've got an ev3 exhaust mani, ported turbine housing, very free intake pipe, 1g head, HKS 264 cams, and my big16g STILL only gets spooled up by like 3100 rpms.

 

[David15151]

well... if the turbine housing is the problem i already ordered one a week ago and im getting it tuesday.. so if that doesnt revert it back to normal big16Gness than that means it really isnt a big16 at all.. prolly a small16g if it stays the same.

i was more concerned with having a problem i dont know about.. guess everything is working just.. unknown parts lead to questions.

 

[IHeartTurbo]

differences in spool times between a b16g and s16g are minimal.

 

[David15151]

ok you guys are scaring me now.. wtf is this a 13g or some crap? does a 13g have that style wheel in the pic?

 

[Boosted98gsx]

yes it has the same "style" of wheel, that's what the letter stands for. G is the standard mitsu staggard compressor wheel. But a 13g has a TD04 Comp housing.

 

[Mike1992]

13g would have TDO4 on the housing and 14b, 16g and so on in the mitsu family TDO5H

 

[David15151]

ok so this has to be a 16g basically. Do you think having a smaller housing like that from a 14b on here would cause it to spool much faster with cutting the top end? I think that might be it.

 

[DSMSpyder99]

it sound like they did a 14B to 16G conversion and it does has a 6cm*2 housing. I have a EVO 16G, SBR manifold, and ported o2 housing and i hit 15PSI by 3200 RPM. A solution would be a Bullseye Turbine Housing to replace the stock housing. I plan to do this because i forgot to get the 34mm flapper and might as well upgrade to a STEEL turbine housing with a 38mm flapper right

 

[David15151]

funny you should say that cause I already ordered one of those last week to fix my creep problem .. comes in tuesday.. nice streak of luck there.