Boost question... (i did search)
#1
1991 Frankin7 ***RIP***
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Boost question... (i did search)
i'm curious as to if i can run 10psi on my car. its a 91 N/A with a S5 TII motor, intake, full turbo back exhaust, walbro 255lph fuel pump, FCD, and boost controller.
is it safe to run 10psi without tuning? i did search before asking and couldn't find anything definate.
is it safe to run 10psi without tuning? i did search before asking and couldn't find anything definate.
#4
1991 Frankin7 ***RIP***
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thanks guys. what would you considder the absolute most it could go to? i'm thinking the 12-14psi mark without tuning.
#7
1991 Frankin7 ***RIP***
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Originally posted by YearsOfDecay
problem is..... you will regularly hit more than 10 psi with your stock wastegate
problem is..... you will regularly hit more than 10 psi with your stock wastegate
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#8
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boost controllers only raise boost. you can't lower it.
chances are you will be over 10psi in 4th and 5th.
10-11psi would be max for your current setup. if you are hitting over that if means you can't floor your car untill you upgrade some more stuff.
chances are you will be over 10psi in 4th and 5th.
10-11psi would be max for your current setup. if you are hitting over that if means you can't floor your car untill you upgrade some more stuff.
#9
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boost controller will do nothing for you with this setup. It can only raise the boost, it cannot lower it. You will get boost spikes up to like 12-13 psi with your stock wastegate. You need to worry about the fuel. i would stick bigger secondary injectors and like Safc to controll em.
#11
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thanks guys for the help. was everything with the S5's better then the S4's? it sure seems like it from what i've read.
#12
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definatly port your wastegate as big as you can, then put on a boost controller. i have a similer setup, and could creep to 14 psi occasionally, now the highest creep ive seen is 9 psi in 4th at WOT. I wasnt getting any detonation at 13 psi, but i wont run anything higher than 11 without injectors and a SAFC, maybe 12 if im at the track and my engine isnt heat soaked.
#13
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is there a flange inside the wastegate like in the Greddy Type-S BOV? if not then whats the largest i can port the wastegate?
#14
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i ran 12-14 with my s4, (2 1/2 turbo back, safc, profec e01, stock tmic, 93 oct fuel, air pump and acv removed) no probs after a little boost of fuel from the safc. but the other night running wot in fourth somehow i lost voltage to fuel pump and now my motor is dead. Might wanna consider fuel pump rewire. i would hate for someone else to be in the same boat!
#15
Originally posted by Rx7Ridah
i ran 12-14 with my s4, (2 1/2 turbo back, safc, profec e01, stock tmic, 93 oct fuel, air pump and acv removed) no probs after a little boost of fuel from the safc. but the other night running wot in fourth somehow i lost voltage to fuel pump and now my motor is dead. Might wanna consider fuel pump rewire. i would hate for someone else to be in the same boat!
i ran 12-14 with my s4, (2 1/2 turbo back, safc, profec e01, stock tmic, 93 oct fuel, air pump and acv removed) no probs after a little boost of fuel from the safc. but the other night running wot in fourth somehow i lost voltage to fuel pump and now my motor is dead. Might wanna consider fuel pump rewire. i would hate for someone else to be in the same boat!
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Originally posted by Rx7Ridah
i ran 12-14 with my s4, (2 1/2 turbo back, safc, profec e01, stock tmic, 93 oct fuel, air pump and acv removed) no probs after a little boost of fuel from the safc. but the other night running wot in fourth somehow i lost voltage to fuel pump and now my motor is dead. Might wanna consider fuel pump rewire. i would hate for someone else to be in the same boat!
i ran 12-14 with my s4, (2 1/2 turbo back, safc, profec e01, stock tmic, 93 oct fuel, air pump and acv removed) no probs after a little boost of fuel from the safc. but the other night running wot in fourth somehow i lost voltage to fuel pump and now my motor is dead. Might wanna consider fuel pump rewire. i would hate for someone else to be in the same boat!
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