Is boost uniform? - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

Mookistar · 29th October 2005, 12:59 PM

I mean, I've got some rebuilt R33 Tubbies coming, with steel internals. I'm not sure of the actual spec, but i imagine they are simply standard R33 spec, only without the scary ceramic bits

My question

I currently run 1 bar on an Abbey ECU. If i whack on the Steelies and still run one bar, does the car need remapping? Or will the turbo's work just the same as my ceramics, only with the oppurtunity to up boost with a remap at a later date?

thanks

mook

SteveN · 29th October 2005, 01:18 PM

Boost pressure and airflow are hugely different, but if the wheels and housings are standard size and style (just with a metal exhaust wheel rather than ceramic) then they will flow the same at the same boost, so yes.

Mookistar · 29th October 2005, 01:43 PM

thank you. That was i thought. wasn't sure if the steel turbo's would give a different boost characteristic and cause running problems

cheers

mook

Pikey · 29th October 2005, 02:02 PM

They'll probably spool up a bit later, as that was the reason behind using ceramic wheels in the first place I think.

Mookistar · 29th October 2005, 02:48 PM

Quote:

Originally Posted by Pikey

They'll probably spool up a bit later, as that was the reason behind using ceramic wheels in the first place I think.

i had wondered if lag would increase from a percived "heavier" wheel.

but so long as the mapping can accomodate that, i'm happy to put up with it.

mook

29th October 2005, 12:59 PM	#1 (permalink)
Mookistar ADMINISTRATOR Join Date: Feb 2004 Location: Living life 8min 50 secs at a time Posts: 10,403	Is boost uniform? I mean, I've got some rebuilt R33 Tubbies coming, with steel internals. I'm not sure of the actual spec, but i imagine they are simply standard R33 spec, only without the scary ceramic bits My question I currently run 1 bar on an Abbey ECU. If i whack on the Steelies and still run one bar, does the car need remapping? Or will the turbo's work just the same as my ceramics, only with the oppurtunity to up boost with a remap at a later date? thanks mook __________________ FOR ALL GTR FORUM RELATED ISSUES CONTACT THE ADMIN TEAM 'MOOKISTAR' OR 'MOLEMAN' SKYLINE FAQ'S!

29th October 2005, 01:43 PM	#3 (permalink)
Mookistar ADMINISTRATOR Join Date: Feb 2004 Location: Living life 8min 50 secs at a time Posts: 10,403	thank you. That was i thought. wasn't sure if the steel turbo's would give a different boost characteristic and cause running problems cheers mook __________________ FOR ALL GTR FORUM RELATED ISSUES CONTACT THE ADMIN TEAM 'MOOKISTAR' OR 'MOLEMAN' SKYLINE FAQ'S!

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29th October 2005, 01:18 PM	#2 (permalink)
SteveN GTR Register Member Join Date: Aug 2002 Location: Just off the M5/A40 Posts: 7,209	Boost pressure and airflow are hugely different, but if the wheels and housings are standard size and style (just with a metal exhaust wheel rather than ceramic) then they will flow the same at the same boost, so yes.

29th October 2005, 02:02 PM	#4 (permalink)
Pikey GTR Register Member Join Date: Feb 2004 Location: Cheltenham Posts: 4,151	They'll probably spool up a bit later, as that was the reason behind using ceramic wheels in the first place I think.