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Old 02-01-2010, 07:07 AM   #1
Volvo242ft
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Default Max boost on an 850R

Just wondering what you all are running for max boost on an 850R?
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Old 02-01-2010, 07:09 AM   #2
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The same as an 850 turbo. Search it. I'll give you a hint, its not more than 1 bar on a 15g.
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Old 02-01-2010, 07:19 AM   #3
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max boost is a matter of opinion.
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Old 02-01-2010, 07:41 AM   #4
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Max boost is determined by the individual car.
Keep turning it up until something breaks.
Diagnose the failure and correct.
Repeat.
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Old 02-01-2010, 07:47 AM   #5
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Who is this Max Boost guy and why are you running from him?
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Old 02-01-2010, 07:56 AM   #6
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Nobody can ever just answer the question.
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Old 02-01-2010, 08:07 AM   #7
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because there is no definitive answer.
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Old 02-01-2010, 08:14 AM   #8
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Originally Posted by 500dollar744ti View Post
because there is no definitive answer.
I thought only the kool-aid man knew the answer?
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Old 02-01-2010, 08:37 AM   #9
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Originally Posted by 2fast4u View Post
Nobody can ever just answer the question.
An R ECU with a correctly functioning 850 is at 12 PSI, the stock 850 ECU hits full cut ~ 14psi. If you have a tuned ECU (off-the-shelf or otherwise), you can run as much boost as you want.

However, the stock TDO4HL turbos that came with 850's become inefficient after around 17-18 psi, so no real reason to go any higher than that.

Its more a question of what turbocharger is being used, how the car is tuned, and what else you have done to the car, not the specific car in question.

The OP isn't giving us why he is asking or what he is running, hence the responses.
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Old 02-01-2010, 09:21 AM   #10
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I have a 95 t5r and I spike a 21 psi and hold 19psi all day on a stock 15g. I only hit boost cut out under heavy load like a freeway on ramp or If Im pulling a hill, on a stock t5r ecu. I also have buddies w/ t5s and that ecu hits cut out @ around 17 psi. my personal opinion after around 16 psi It doesnt make much power. unless you get something to cool that boost like a little no2 which works awesome.
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Old 02-01-2010, 09:25 AM   #11
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It's not about the turbo. On the 5 cyl, it's more about the rods, and how (when) the boost is delivered.

I will NOT boost over 18psi on my T5, no matter what turbo. The 15G taps out at around 18psi according to my dynos and timeslips, and any larger turbo charger that CAN make more boost efficiently runs the risk of bending the rods in the whiteblock.

I'm about to swap out the 15G for a 19T on my T5, and I will be keeping the same 18psi tune. The turbo can make plenty more; the engine, not so much. Rods tend to bend all too frequently at above 20psi. Can't tell you how many posts there are with pics of bent rods on VS.

Also, if you can, get a TUNE to raise your boost on your T5 instead of an MBC. You're less likely to blow your engine that way.
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Old 02-01-2010, 10:52 AM   #12
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Just pull the vacuum line off the actuator. That's the maximum boost you can do without turbo modification.
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Old 02-01-2010, 11:26 AM   #13
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Quote:
Originally Posted by L8 APEKS View Post
It's not about the turbo
Yes it is.
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Old 02-01-2010, 11:28 AM   #14
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Quote:
Originally Posted by 84 Blue 240 View Post
Just pull the vacuum line off the actuator. That's the maximum boost you can do without turbo modification.
lol, sadly that's just about correct.
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Old 02-03-2010, 02:36 PM   #15
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28 psi...

Listen to ErikS and L8 Apeks posts...
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Old 02-03-2010, 03:14 PM   #16
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Quote:
Originally Posted by ErikS View Post
Yes it is.
15G, 16T, 18T, 19T...all whiteblock turbos. Switching from one to the other doesn't make an engine blow up. Hence, it's NOT about the turbo itself.

Like I said - no matter what turbo you're running, the more crucial variables are (1) boost delivery and (2) protecting the rods from bending, which happens all too often on this engine, largely due to (1) - often because greedy, younger drivers are too aggressive with their MBC's.

OP...need more info. Max boost is relative to what modifications are on the engine.
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Old 02-03-2010, 06:24 PM   #17
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Quote:
Originally Posted by 84 Blue 240 View Post
Just pull the vacuum line off the actuator. That's the maximum boost you can do without turbo modification.
When this happened to me, the wastegate got stuck open and I had zero boost.
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Old 02-03-2010, 06:47 PM   #18
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on stock internals, turbo, intercooler..ect and a chipped ecu i think 17-18 psi is still as reliable as stock form.
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Old 02-03-2010, 09:29 PM   #19
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Wow, surprised I'm the first...


How much stock a boost can support??
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Old 02-04-2010, 08:53 AM   #20
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Quote:
Originally Posted by L8 APEKS View Post
Like I said - no matter what turbo you're running, the more crucial variables are (1) boost delivery and (2) protecting the rods from bending, which happens all too often on this engine, largely due to (1) - often because greedy, younger drivers are too aggressive with their MBC's.
You forgot one. Consistently running too much boost on too small of a turbo from racing JDM's, not seeing the warning signs, and then cracking your block.
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Old 02-04-2010, 08:55 AM   #21
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Originally Posted by gsellstr View Post
Wow, surprised I'm the first...


How much stock a boost can support??

On a Volvo 850, it is exactly 13.5 psi. Regardless of model, turbo, condition, or how loose the nut is behind the wheel. I have seen more problems with loose nuts behind the wheel in Volvo 850s than perhaps any other make or model. However 13.5 psi is about right ;)
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Old 02-04-2010, 09:20 AM   #22
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Quote:
Originally Posted by ErikS View Post
You forgot one. Consistently running too much boost on too small of a turbo from racing JDM's, not seeing the warning signs, and then cracking your block.
Man, that would suck. I'm sure glad my block isn't cracked, and I'm glad I have a safe tune instead of a boost controller so I don't run too much boost!

And the answer, in case it's not blatantly obvious, is...

...42 psi.

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Old 02-04-2010, 04:36 PM   #23
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Originally Posted by L8 APEKS View Post
Man, that would suck. I'm sure glad my block isn't cracked
Oh my bad, what was it that failed, cylinder head?

Last edited by ErikS; 02-04-2010 at 04:48 PM..
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