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13t boost questions

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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Sommerfeldt
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Sommerfeldt

Re: 13t boost questions

Post by Sommerfeldt » Sun Apr 14, 2019 4:12 am

Gmstewart22 wrote:
Sat Apr 13, 2019 11:06 pm
Perhaps this is just my ignorance, but when I turn up my wastegate pressure I get an overboost code and my computer compensates by cutting fuel my tuner guy says that's what he tunes for.. he adjusts the computer to accept a higher value.. man now I'm really confused! Again pardon my ignorance I've only been into volvos for a few years and just recently started nodding them
“Tightening” the wastegate does what Matt says - you move the boost curve to a different RPM range - it doesn’t actually increase boost.

As you mention, it can create boost spikes. This is due to the ECU not expecting the boost level, or in your car (and mine), the volume of air coming in. It will then (over)correct, usually to the detriment of performance in favor of its own safety, such as with cutting fuel.

The boost levels are controlled by the ECU via the TCV (turbo control valve) duty cycle table/map, which also interacts with the Load request map and the fueling map in the ECU. Most of the calculations are based on MAF (mass air flow) sensor input to the ECU, coupled with throttle position, etc. You can absolutely not control boost levels with the wastegate (alone).

As Matt says, for 98 (and older), as well as some 99s, you can use a manual boost controller, but you also need to be aware that an MBC creates the risk of too high boost levels at low RPM, as well as lean conditions. Both of those can be catastrophic to the engine. I.e. no more engine. Done correctly, an MBC is excellent. Done incorrectly, you need a new engine.

- S


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

tardcart
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tardcart

Re: 13t boost questions

Post by tardcart » Sun Apr 14, 2019 6:08 am

To simplify the waste gate explanation, the final pressure on a small turbo at WOT will be the same due to limited ability, disabling or shortening the actuator will bring higher pressure earlier, where it can be dangerous to the engine. If you had a 15t in there the final pressure would be higher disabling the waste gate as the turbo has the capacity to deliver around 10 pounds at wot and max rpm. so in general the waste gate does limit the final pressure, just not in your case.



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Gmstewart22
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Gmstewart22

Re: 13t boost questions

Post by Gmstewart22 » Sun Apr 14, 2019 11:26 am

I see, the few times I have adjusted my wastegate I have noticed my car woke up a bit but perhaps it's as you said that I'm moving max boost down the power curve a few ticks.
So now for the big question, why are there people claiming to get 12# boost out of their 13T/v70 cars?
That is the maximum pressure this turbo is capable of?


2000 v70 GLT
1997 v70 AWD lpt
1997 v70 AWD lpt "rally rig"
1995 850 T5

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Gmstewart22
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Gmstewart22

Re: 13t boost questions

Post by Gmstewart22 » Sun Apr 14, 2019 11:34 am

To be clear, I know that each turbo is only capable of so much boost and wastegate cant change that this I know I just thought that the 13T was capable of alot more boost.
On another thread I found a guy claiming that the number before the letter corresponded with the turbos maximum output psi. 13T-13psi 15T-15psi 18T-18psi and so on.. must be alot of miss-information out there.😬🤯


2000 v70 GLT
1997 v70 AWD lpt
1997 v70 AWD lpt "rally rig"
1995 850 T5

Sommerfeldt
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Sommerfeldt

Re: 13t boost questions

Post by Sommerfeldt » Sun Apr 14, 2019 12:04 pm

tardcart wrote:
Sun Apr 14, 2019 6:08 am
To simplify the waste gate explanation, the final pressure on a small turbo at WOT will be the same due to limited ability, disabling or shortening the actuator will bring higher pressure earlier, where it can be dangerous to the engine. If you had a 15t in there the final pressure would be higher disabling the waste gate as the turbo has the capacity to deliver around 10 pounds at wot and max rpm. so in general the waste gate does limit the final pressure, just not in your case.
Again... I don’t think there’s a 13T in a ‘98. Didn’t those first arrive in ‘99? Also, there is no 15T - there’s 15G and 16T.
My ‘96 T5 now delivers 14 psi, reliably, on its 15G, and that is obviously not the upper limit, so I’m not sure where you get the numbers.

As for the ‘98 V70 GLT LPT, iPD’s tune will get it up to 12 psi, from 8. With that tune, they claim 230 HP, up from 190.

- S


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

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Gmstewart22
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Gmstewart22

Re: 13t boost questions

Post by Gmstewart22 » Sun Apr 14, 2019 12:32 pm

Check these out. This is looked up off my vin numbers
You do not have the required permissions to view the files attached to this post.


2000 v70 GLT
1997 v70 AWD lpt
1997 v70 AWD lpt "rally rig"
1995 850 T5

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RickHaleParker
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RickHaleParker

Re: 13t boost questions

Post by RickHaleParker » Sun Apr 14, 2019 1:03 pm

Gmstewart22 wrote:
Sun Apr 14, 2019 12:32 pm
Check these out. This is looked up off my vin numbers
B5254T

The B5254T is a 2.4 L (2,435 cc) straight-five. It is turbocharged and intercooled with a power output 193 PS (142 kW; 190 hp) at 5100 rpm, with 270 N⋅m (200 lb⋅ft) of torque at 1800–5000 rpm. It is equipped with Bosch Motronic 4.4 engine management for model years 1997 and 1998. It is equipped with Bosch ME7 engine management for model year 1999. Boost pressure is limited to 6 psi (41 kPa).

Applications:

1997 Volvo 850 badged as 850 AWD or 850 2.5T
1997 –1999 Volvo S70 badged as S70 2.5T or S70 AWD
1997 –1999 Volvo V70 badged as V70 2.5T, V70 AWD or V70 2.5T AWD
1998–1999 Volvo V70 XC badged as V70 XC AWD or V70 XC 2.5T AWD
1998–1999 Volvo C70 badged as C70 2.5T (convertible)
1998–1999 Volvo C70 badged as C70 2.5T (coupé)


Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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erikv11
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erikv11

Re: 13t boost questions

Post by erikv11 » Sun Apr 14, 2019 6:55 pm

You can just read the plate on the turbo to be sure, but it cam from the factory with a 13t. All AWD in 98 had the LPT engine.

You can also put on a 15g or 16t, an HPT ECU and the injectors to match from the engine, and get more boost that way.


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

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Gmstewart22
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Gmstewart22

Re: 13t boost questions

Post by Gmstewart22 » Sun Apr 14, 2019 6:58 pm

I thought it came with the 13T,


2000 v70 GLT
1997 v70 AWD lpt
1997 v70 AWD lpt "rally rig"
1995 850 T5

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erikv11
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erikv11

Re: 13t boost questions

Post by erikv11 » Sun Apr 14, 2019 7:03 pm

Look at the turbo, look for this plate, check what it says on it. You will likely need to wipe off some grime, they all get messy.

You will now for sure what you have!
turbo plate.jpg
You do not have the required permissions to view the files attached to this post.


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

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