Turbo Sizing Question
06-08-2008, 02:58 PM
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Turbo Sizing Question Alright here's my setup to start with, i have a Forged 370 Short Block, Stock 317 heads, 220/216 116 LSA Cam and a ITS 72mm with a .96 A/R
I was on forced Inductions Website today reading compressor maps and it looks like i'm only gonna get 10psi out of this thing
Is that right???
So i started looking and searching and i am thinking that i'm gonna have to jump to an ST80 but with or without race cover and what do ya'll think???
I was on forced Inductions Website today reading compressor maps and it looks like i'm only gonna get 10psi out of this thing
Is that right???
So i started looking and searching and i am thinking that i'm gonna have to jump to an ST80 but with or without race cover and what do ya'll think???
06-08-2008, 03:58 PM
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What RPM do you plan to shift at?
I think an ST-80 would be overkill for your setup, A properly sized TC-76-78 would be better.
FI even has a sale on the 78mm TC units for 999.00 right now..
https://ls1tech.com/forums/forced-induction/916894-new-turbo-tc-product-update.html
I think an ST-80 would be overkill for your setup, A properly sized TC-76-78 would be better.
FI even has a sale on the 78mm TC units for 999.00 right now..
https://ls1tech.com/forums/forced-induction/916894-new-turbo-tc-product-update.html
06-08-2008, 04:02 PM
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so i looked at the T72 map and with a Pressure ratio of 1.68 the turbo is well beyond the right side of the graph and at 1.82P/R i'm still not at the required 70lbs
06-08-2008, 04:28 PM
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I Thought so at first but i want to set my Shift points above 6500 so that equates to 62lbs at 10psi and 70lbs at 12psi
so i looked at the T72 map and with a Pressure ratio of 1.68 the turbo is well beyond the right side of the graph and at 1.82P/R i'm still not at the required 70lbs
so i looked at the T72 map and with a Pressure ratio of 1.68 the turbo is well beyond the right side of the graph and at 1.82P/R i'm still not at the required 70lbs
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06-08-2008, 11:17 PM
#14
I Thought so at first but i want to set my Shift points above 6500 so that equates to 62lbs at 10psi and 70lbs at 12psi
so i looked at the T72 map and with a Pressure ratio of 1.68 the turbo is well beyond the right side of the graph and at 1.82P/R i'm still not at the required 70lbs
so i looked at the T72 map and with a Pressure ratio of 1.68 the turbo is well beyond the right side of the graph and at 1.82P/R i'm still not at the required 70lbs
06-09-2008, 01:18 AM
#15
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Its not that it won;t make more boost....what happens when you dive off the compressor map is the outlet temps will soar and efficency drops like a rock. Also when it drops, that means turbine speed has to then be much higher per psi gained, which also means back pressure climbs FAST. Its all about a complete system on a turbo, which means both the intake and exhaust have to work together.
I am really trying to stay in effeciency range, i may have a deal to get an ITS 80mm for now as an almost trade for my 72mm so that should do a touch better till i get the fundage for a 85+