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Low Rpm Boost?


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#1 mrbrightside2009

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Posted 04 October 2010 - 12:43 AM

yea i know this has been discussed a million times, tried searching and came up with not a whole lot, my boost starts to come in around 2500 rpm and i hit full boost of 14 psi about 3500-3700 rpm, does this seem too low or is it fine? this is with a mbc and all mods in my sig.
1998 s70 glt t5 converted - 16t, t5 ecu, white injectors, nxs mbc @ 11psi, cone filter, magnaflow muffler, 3in. DP, high flow cat, full 3in. exhaust, hd wg, na tb, ipd turbo hoses, 6000k hids, black mesh grille, columba wheels, glowshift boost gauge, white interior leds, stage 0 complete



#2 johnloves850's

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Posted 04 October 2010 - 12:50 AM

That's just the nature of the beast with mbc's.
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#3 zomgitsavolvo

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Posted 04 October 2010 - 12:52 AM

yea i know this has been discussed a million times, tried searching and came up with not a whole lot, my boost starts to come in around 2500 rpm and i hit full boost of 14 psi about 3500-3700 rpm, does this seem too low or is it fine? this is with a mbc and all mods in my sig.

Sounds about right. I overcome vac. right around 2250 and start building right around 2400. I hit 10 PSI by 3250 and 12.5 PSI by 3500, so your numbers sound right on target for a T5. All I've got is an R ECU, straight pipe, and a torn CBV.

No MBC here either. Stock TCV.

#4 Charles T

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Posted 04 October 2010 - 02:36 AM

I hit all the way into the white at 3K

Does anyone know the equivalent PSI for the edge of the white on the factory gauge?
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#5 T5power

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Posted 04 October 2010 - 02:40 AM

I hit all the way into the white at 3K

Does anyone know the equivalent PSI for the edge of the white on the factory gauge?


i've heard the end of the white is 1 bar, aka 14.7

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#6 mrbrightside2009

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Posted 04 October 2010 - 02:51 AM

aight, guess im fine then, thanks guys.
1998 s70 glt t5 converted - 16t, t5 ecu, white injectors, nxs mbc @ 11psi, cone filter, magnaflow muffler, 3in. DP, high flow cat, full 3in. exhaust, hd wg, na tb, ipd turbo hoses, 6000k hids, black mesh grille, columba wheels, glowshift boost gauge, white interior leds, stage 0 complete

#7 850T5M

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Posted 04 October 2010 - 03:30 AM

Anyone know what "high boost in low rpms" would mean? The type of high boost that would bend rods easier in the low rpms? :P

I have a manual car and I usually dont stomp on it until I'm at around 3000rpm, even at that, I dont just step to the floor, usually have about 7 PSI till maybe 4k, then 14PSI till the end :)

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#8 T5power

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Posted 04 October 2010 - 04:53 AM

Anyone know what "high boost in low rpms" would mean? The type of high boost that would bend rods easier in the low rpms? :P

I have a manual car and I usually dont stomp on it until I'm at around 3000rpm, even at that, I dont just step to the floor, usually have about 7 PSI till maybe 4k, then 14PSI till the end :)

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#9 ozzimark

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Posted 04 October 2010 - 11:44 AM

yea i know this has been discussed a million times, tried searching and came up with not a whole lot, my boost starts to come in around 2500 rpm and i hit full boost of 14 psi about 3500-3700 rpm, does this seem too low or is it fine? this is with a mbc and all mods in my sig.

That's it? When I was running an MBC, I was seeing 5psi by 2000rpm, and 10 before 3000rpm.. :unsure:

#10 850T5M

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Posted 04 October 2010 - 01:40 PM

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lol I know what a bent rod looks like, I meant what kind of boost are we looking at in the low rpm range?

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#11 ozzimark

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Posted 04 October 2010 - 04:15 PM

lol I know what a bent rod looks like, I meant what kind of boost are we looking at in the low rpm range?

Enough to cause detonation. Boost doesn't kill, det does.

#12 zomgitsavolvo

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Posted 04 October 2010 - 04:58 PM

Enough to cause detonation. Boost doesn't kill, det does.

If you push your luck, you'll bend with boost, but unless you've got a GT35 or something shoving in 2 bar, detonation will be your killer. On that note, I wonder what the tipping point is for our AIT is before we get into the zone of detonation being highly likely.

#13 Fudge_Brownie

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Posted 04 October 2010 - 07:58 PM

And another faulty permaban. No more talking, especially from those who think a twin turbo 13G/16T using the 13G to make up for the 16T's "turbo lag" is a good idea. Continue on here, I like quantitative values, but I don't think anyone has any to contribute.
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#14 mrbrightside2009

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Posted 04 October 2010 - 08:25 PM

That's it? When I was running an MBC, I was seeing 5psi by 2000rpm, and 10 before 3000rpm.. :unsure:


wow thats low lol, guess mines not that bad then.
1998 s70 glt t5 converted - 16t, t5 ecu, white injectors, nxs mbc @ 11psi, cone filter, magnaflow muffler, 3in. DP, high flow cat, full 3in. exhaust, hd wg, na tb, ipd turbo hoses, 6000k hids, black mesh grille, columba wheels, glowshift boost gauge, white interior leds, stage 0 complete

#15 Jaxx

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Posted 04 October 2010 - 08:29 PM

Enough to cause detonation. Boost doesn't kill, det does.

Thank you. I was about to slap someone. +1 for you.

Anyone know what "high boost in low rpms" would mean? The type of high boost that would bend rods easier in the low rpms? :P

I have a manual car and I usually dont stomp on it until I'm at around 3000rpm, even at that, I dont just step to the floor, usually have about 7 PSI till maybe 4k, then 14PSI till the end :)

I'm sorry, you have a small turbo but you don't want to use it how it was designed? The great thing about having a turbo too small for the motor (all cars turboed from the factory) is torque down low. It makes the cars feel more powerful than they are. If you want to wind out your motor to 6k, go ahead, but 5th gear and torque work together.

I feel bad for people who are afraid to go WOT. If you have issues going WOT before 4k it should only be because of loss of traction.

on my 850 I could boost 5psi at 2k in 3rd gear no problem. Given it was an automatic, so that was only part throttle.

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#16 S850

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Posted 05 October 2010 - 01:58 AM

And another faulty permaban. No more talking, especially from those who think a twin turbo 13G/16T using the 13G to make up for the 16T's "turbo lag" is a good idea. Continue on here, I like quantitative values, but I don't think anyone has any to contribute.

Dude, u srsly think perma-banning one of my 30+ random accounts is doing anything useful? It hasn't yet, nor will it ever. Keep trying if u want. As long as VS exists, I'll be on here. I've already done more to my car than many senior members on this board have, so I don't need to prove anything to anyone IMO. People on here don't know the real story of stuff. As much as GreekOne hates me, I back him. I know he's not a thief, and he's a good kid that got lost. (We all do it at one point in our lives.)

Get over your mod powers. You're not cool when you ban people for stuff that can be disputed offline.

#17 mrbrightside2009

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Posted 05 October 2010 - 02:15 AM

Dude, u srsly think perma-banning one of my 30+ random accounts is doing anything useful? It hasn't yet, nor will it ever. Keep trying if u want. As long as VS exists, I'll be on here. I've already done more to my car than many senior members on this board have, so I don't need to prove anything to anyone IMO. People on here don't know the real story of stuff. As much as GreekOne hates me, I back him. I know he's not a thief, and he's a good kid that got lost. (We all do it at one point in our lives.)

Get over your mod powers. You're not cool when you ban people for stuff that can be disputed offline.


haha yea i just gave you a +1.
1998 s70 glt t5 converted - 16t, t5 ecu, white injectors, nxs mbc @ 11psi, cone filter, magnaflow muffler, 3in. DP, high flow cat, full 3in. exhaust, hd wg, na tb, ipd turbo hoses, 6000k hids, black mesh grille, columba wheels, glowshift boost gauge, white interior leds, stage 0 complete

#18 GltGreco

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Posted 05 October 2010 - 02:18 AM

haha yea i just gave you a +1.


hahaha so did i, i mean idk how this Twin T idea is gonna work out just to say the least, but there was nothing about that post that was really worth a ban IMO, i guess we gotta let alden be alden haha

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#19 ozzimark

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Posted 05 October 2010 - 11:28 AM

hahaha so did i, i mean idk how this Twin T idea is gonna work out just to say the least, but there was nothing about that post that was really worth a ban IMO, i guess we gotta let alden be alden haha

Usually when someone is "permabanned", any other accounts they make get banned as well, regardless of the content of a single post.

That said, if this were my forum, I would ban him as well, simply for being so factually misleading. :rolleyes:

#20 GltGreco

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Posted 05 October 2010 - 06:12 PM

Usually when someone is "permabanned", any other accounts they make get banned as well, regardless of the content of a single post.

That said, if this were my forum, I would ban him as well, simply for being so factually misleading. :rolleyes:


half the people are factually misleading on here so should they all get banned but no i get a permaban means no sneaking back on, i just find it amusing.

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2004 XC70 - Ma        2007 XC90 - Pa







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