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Bus Discussion => Bus Topics ( click here for quick start! ) => Topic started by: chuckd on June 25, 2013, 06:43:53 AM



Title: turbo size
Post by: chuckd on June 25, 2013, 06:43:53 AM
Good morning all:  I asked for and received advice on how to enhance the performance of my 79 6V92. Clifford et al, was helpful, but I do not have enough knowledge to put in play what was suggested i.e.  I presently have a Garrett TV8102 with a/r ratio of 1.23, what Clifford suggests and what I will do is to change to a Garrett TV7512, but my issue is I think Clifford wants a a/r ratio of 1.95.  Is their another way of describing that ratio, i.e. a number for the intake and exhaust i.e..76 and .95 or ?  Where is the a/r ratio noted on the turbo?  I can find lots of TV7512s, just not the 1.95 ration - at least I think that is my problem.  Any help would be appreciated.

Chuckd - who is way to smart to not do what Clifford says.
1979 Prevost Stillwater Mn


Title: Re: turbo size
Post by: lostagain on June 25, 2013, 07:55:56 AM
I recently replaced the turbo on my 6V92 with a TV7512 with an A/R of 1.23 . Also 9G90 injectors set at 1.46". That gives me 350 HP and 1050 lb/ft (on paper at least). Great improvement! I pass all the transport trucks up the hills, except the empty ones. Really flattens the little hills on the hwy.

JC


Title: Re: turbo size
Post by: luvrbus on June 25, 2013, 08:09:03 AM
The A/R is stamped inside the hot housing the turbo needs to be removed to see the numbers what injectors do have ? we are sorta of limited here on what we can do with your green engine and get good service from it I wouldn't take to 350 hp


Title: Re: turbo size
Post by: chuckd on June 25, 2013, 10:49:36 AM
Clifford in a previous post you recommended 9g85 injectors, which is what I will use.


Title: Re: turbo size
Post by: luvrbus on June 25, 2013, 10:53:14 AM
That will work where do want your torque range,low end, mid range ,or top end tell us and we will adjust the hot housing for your needs 

You have a by pass blower ?

good luck