How much boost can I run?

CooperV · 02-15-2021, 01:05 PM

So I have a 1987 Volvo 760 turbo intercooler, and I know my car has the smaller rods. But I’m wondering how much boost it is safe to run until I get a engine with the bigger rods? Is 12-13 psi still safe?

holtzboy · 02-15-2021, 01:33 PM

In before how PSI a stock can support.

If your car is at a good stage zero state, running healthy and you run quality premium fuel, running 13 psi *should* be safe. I would invest in getting a second o2 sensor bung welded to the lower part of your downpipe and running a wideband gauge so you can monitor your AFRs.

240240 · 02-15-2021, 02:20 PM

Quote:

Originally Posted by CooperV

So I have a 1987 Volvo 760 turbo intercooler, and I know my car has the smaller rods. But I’m wondering how much boost it is safe to run until I get a engine with the bigger rods? Is 12-13 psi still safe?

if your car is filthy inside with a bunch of fastfood wrappers in it stock 6lbs of boost is too much. if your grandma drove it 69k miles, then died and gave it to you then you can run 25psi on stock internals until you blow it up.

Redwood Chair · 02-15-2021, 02:23 PM

CNA Sprout

Dicktater · 02-15-2021, 03:54 PM

Quote:

Originally Posted by CooperV

So I have a 1987 Volvo 760 turbo intercooler, and I know my car has the smaller rods. But I’m wondering how much boost it is safe to run until I get a engine with the bigger rods? Is 12-13 psi still safe?

plug the hose and run all the boost!

Jussi Alanko · 02-15-2021, 04:51 PM

The rods will bend something about 250hp, which can be make at 13psi or a 24psi, so it is kinda hp thing, not boost thing.
It depends lot's of what head you had and what cam you had etc etc. But i say if it's totally original i won't run it above 15psi.

mikep · 02-15-2021, 06:48 PM

It’s a torque thing. HP is torque times speed. Boost spikes at low speed fo more damage, as well as hard detonating at low/mid speeds.

dl242gt · 02-16-2021, 03:40 PM

In proper stage zero I wouldn't run a small rod engine over about 11-12psi. Those engines also have the worst pistons for wear and causing slap. As suggested above get a wideband O2 gauge to monitor the engine mixture.

240240 · 02-16-2021, 04:36 PM

Quote:

Originally Posted by Jussi Alanko

The rods will bend something about 250hp, which can be make at 13psi or a 24psi, so it is kinda hp thing, not boost thing.
It depends lot's of what head you had and what cam you had etc etc. But i say if it's totally original i won't run it above 15psi.

I bet you I can bend a rod at 108hp

Redwood Chair · 02-16-2021, 04:40 PM

Quote:

Originally Posted by 240240

I bet you I can bend a rod at 108hp

I tried but the 'M' rods wouldn't give.

LC4CARL · 02-16-2021, 06:30 PM

02-15-2021, 01:05 PM	#1
CooperV Newbie Join Date: Sep 2020 Location: Colorado	How much boost can I run? So I have a 1987 Volvo 760 turbo intercooler, and I know my car has the smaller rods. But I’m wondering how much boost it is safe to run until I get a engine with the bigger rods? Is 12-13 psi still safe?

02-15-2021, 01:33 PM	#2
holtzboy Still have my first car Join Date: Mar 2004 Location: Cornelius, OR	In before how PSI a stock can support. If your car is at a good stage zero state, running healthy and you run quality premium fuel, running 13 psi should be safe. I would invest in getting a second o2 sensor bung welded to the lower part of your downpipe and running a wideband gauge so you can monitor your AFRs. __________________ 1. '86 244DL- 1st car & owned for 18 years, 500k miles, 94 B230FT mild build in the works 2. '93 244DL - Daughter's DD, mostly stock with Hydras 3. '07 Vette Z06 - Early mid-life crisis vehicle 4. '17 CRV - Boring DD My feedback thread

02-16-2021, 03:40 PM	#8
dl242gt Happy playing the blues Join Date: Jun 2002 Location: S NJ, a suburb of Phila.	In proper stage zero I wouldn't run a small rod engine over about 11-12psi. Those engines also have the worst pistons for wear and causing slap. As suggested above get a wideband O2 gauge to monitor the engine mixture. __________________ Dave, 1982 242 turbo. 338k miles. MVP coilovers and 3" exhaust. Flowed 405 with a V15. Cossie turbine housing with upgraded compressor housing. 90+, IPD remote oil filter. Some other goodness, too. Been lots of fun over 25 years. Restored in 2k. Now ready for a 2nd restoration. 1993 245 Classic, 430k miles, enem V15. IPD bars and chassis braces. Simons sport exhaust from Scandix. sbabbs ezk chip. Been a good road warrior. Genuine Volvo rebuilt leaky M47.

02-16-2021, 06:30 PM	#11
LC4CARL Aero challenged Join Date: Sep 2008 Location: Vancouver, WA	__________________ @PDXvolvo on IG

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02-15-2021, 04:51 PM	#6
Jussi Alanko Board Member Join Date: Jun 2020 Location: Finland	The rods will bend something about 250hp, which can be make at 13psi or a 24psi, so it is kinda hp thing, not boost thing. It depends lot's of what head you had and what cam you had etc etc. But i say if it's totally original i won't run it above 15psi.