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200 V70 Boost and v.e. 2-3 Shift issue?

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Sommerfeldt
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Re: 200 V70 Boost and v.e. 2-3 Shift issue?

Post by Sommerfeldt » Sun Nov 04, 2018 1:15 pm

So, is it just me, or...

'96 855 T5, R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.

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June
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Re: 200 V70 Boost and v.e. 2-3 Shift issue?

Post by June » Wed Jan 02, 2019 1:27 pm

Yarddogperformance wrote:
Wed Sep 26, 2018 7:38 am
:roll: ok this might be a bs thread.
When i got my v70 xc it ran about 5psi
Put a manual boost control (by pass style)
To no avail
I worked on the bov, found that the spring was week, so i made it adjustable.
Still 5 psi
So i did the old jamacan wastegate preload.
10 psi. Ok now what right?
Tire fryer
So becouse i like the car i cut it back
9 psi, great power (i thought) until i lost to a 200k civic
And on the 2-3 it struggled to upshift, (either lack of fuel or trans issue.

So i backed it down to 8 psi
2-3 doesnt struggle, and power is better than before, but why the issues on the 2-3 shift?

I believe it need more fuel, so what im thinking is a gtx 3076 r, at about 8 psi, but am i going to run into the laggy shift again? Thistime becouse of valume and not pressure?

Please no bs keyboard mechanic crap. If your rolling a stock volvo and cant change your oil please dont say anything leave it for someone who knows please
This post has had me curious as to what boost is normal. I think my 740 and I know my 850 both had a turbo gauge. I dont recall numbers indicating say ie 1 to 50 psi. Recently I bought a wifi reader to view on my phone what the actual temperature is doing and discovered the computer monitors all sorts of things. One being vacuum/ boost via the MAP Sensor. So I took several screenshots of boost or vacuum with speed, throttle, cooling temperature, and rpm. This is a 2004 Volvo S80 T6 completely stock in perfect running order. Notice at times it is producing over 30psi of boost. Some initial spikes to 50psi occur momentarily than instantly back down to a lower psi. From idle, turbos not spooled around 15psi is instant, than rises to mid 20's, than backs off between 4000 to 6000 rpm. Under 10 psi during full acceleration when the tach hits redline, gear change than back to the 20's to repeat the process as each gear is changed on wot full acceleration. Of course 1st gear ends quickly. My car has no bent rods, and I have run it hard for 175K thus far. I really would like you to share more of your project and findings. June
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93Regina
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Re: 200 V70 Boost and v.e. 2-3 Shift issue?

Post by 93Regina » Thu Jan 03, 2019 8:51 pm

June wrote:
Wed Jan 02, 2019 1:27 pm
what boost is normal.
At normal atmospheric pressure, a naturally aspirated engine has 14.7 psi of "boost" at sea level. Most boost gauges are zero'ed at 14.7psi. I'm not a turbo person, but seeing high boost numbers like 20-30+ psi would require a well built engine running alcohol.

"There's a wide variation, but back in the '90's it was clustered in the 10-12psi range for a typical 4-cyl turbocharged performance model. Nowadays 16-18psi is not abnormal for high performance factory cars. Of course, you'll find some economy cars in the 5-6psi range, where they're using boost to let a little tiny fuel-efficient engine not be completely miserable to drive. :-)"

See: Turbo tech: How much boost is too much boost?

The zero number represents 14.7psi.....the higher numbers represents psi, and lower than zero numbers, intake's vacuum amount. This would be a gauge that a high performance vehicle might have, but few engines could handle high boosts. In a semi-truck, seeing 30psi boost would be rare, and would require very cold air.

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Re: 200 V70 Boost and v.e. 2-3 Shift issue?

Post by 93Regina » Thu Jan 03, 2019 9:00 pm

June wrote:
Wed Jan 02, 2019 1:27 pm
2004 Volvo S80 T6 completely stock...producing over 30psi of boost.
If a true 30psi boost, your turbo has an issue that needs to be addressed (aka fixed). From this cite, 8psi is stock.

S80 2.9 T6 1999-2006

HP(Stock/ipd): 268/310
Boost PSI(Stock/ipd): 8/14

precopster
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Re: 200 V70 Boost and v.e. 2-3 Shift issue?

Post by precopster » Fri Jan 04, 2019 6:02 pm

Just a side note to the OP: If you're running a 2000 model XC which naturally came with the 4 speed auto, did you swap over to the 5 speed auto from the R of the same year (which means you would need the R TCM and loom as well)?

Looking at the 2-3 shift problem had me wondering how to answer your question about the shift issue because it all depends on which auto box you have.

BTW interesting thread. I have a 2001 T5 with auto box and a shoehorned B5244T3 (I still retain the large turbo and T5 ECM) and it runs fine but I wonder of the engine can handle your mod idea given the smaller spacing between cylinders)
Current cars:2002 XC70, 2001 V70 T5, 2006 XC90 2.5T, VW Transporter 2.5TDI

www.precisioncarmodules.com.

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Re: 200 V70 Boost and v.e. 2-3 Shift issue?

Post by Sommerfeldt » Mon Jan 14, 2019 2:48 pm

June;
Like 93Regina says, 14.7 psi is "0". I.e. that's atmospheric pressure, the pressure we breath in normally. What your numbers seem to indicate is that either the ECU or the gauge isn't factoring in that 14.7 psi of atmospheric pressure, and simply adding it onto the numbers instead. Possibly in combination with some other issue, since even when subtracting atmospheric, your numbers seem too high.

You can't have 30+ psi of boost (i.e. pressure added to atmospheric) in a stock engine without spewing parts every which way. And I do believe it would happen pretty much instantly if you WOT it and smack 30 psi in there.

The 850's factory boost gauge does not have numbers, that's correct. Only a white line and a red indicator.

- S
'96 855 T5, R bumper and spoiler, Koni Yellows & blue H&R springs all 'round.

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