Turbine Inlet Pressure (TIP) testing, Part I.

Mike2kS4 · 10-04-2005, 01:37 PM

Ray(Ochlockonee)sent me his TIP tester. Brown left it for me when I got home today so I promptly installed it and went for a spin.

Midrange tip/manifold pressure ratios were around .85:1. 19 to 23.5. Top end it picked up to a peak of 42/22.5 or 1.87:1. This didn't vary much throughout the gears, maybe a PSI or so.

Even more amazing: Ray said this gauge is off about 4psi on the top end of the range over his "good" gauge he used for his measurements. SO, tip is 37/22.5 or 1.69:1

I was expecting a shade under 2:1 but this is darned impressive. I'm going to drive with it for a week or so and further measure TIP under all kinds of driving circumstances and boost levels. I'm also enlisting/conscripting other local K04 guys to get some more data

Thanks for letting me borrow the tester Ray!

ryans4 · 10-04-2005, 01:40 PM

i must have skipped the TIP chapter in Maximum Boost.

VonK :: Retired · 10-04-2005, 01:46 PM

RAD69 · 10-04-2005, 01:49 PM

BTW - my Audi is finally my daily driver again! You gotta go for a spin again, this thing is fast... Time to hook up the AVC-R, I want your help programming it. Pwleeease!

Funkweasel · 10-04-2005, 01:51 PM

Mike2kS4 · 10-04-2005, 01:51 PM

Basically, the higher the TIP the more problems you have regarding having exhaust properly expelled out of the engine and through the turbo itself. You can have exhaust gases revert into the combustion chambers and choke the entire system.

Normal TIP for an OE designed turbocharger is around 2:1. Some are more, some are less. TIP is affected by the AR of the turbine housing and the turbine outlet size as well as the size of the turbine itself.

Being as I have an overboosted version of a turbocharger with a very small turbine/housing, anything under 2:1 is damned impressive.

Mike2kS4 · 10-04-2005, 01:52 PM

Mike2kS4 · 10-04-2005, 01:52 PM

Funkweasel · 10-04-2005, 01:53 PM

seemed to work, didn't it? Heh.

Captain Matt, I be · 10-04-2005, 01:53 PM

10-04-2005, 01:37 PM	#1
Mike2kS4 AudiWorld Super User Garage is empty, add now Join Date: Jun 2002 Posts: 12,096	Turbine Inlet Pressure (TIP) testing, Part I. Ray(Ochlockonee)sent me his TIP tester. Brown left it for me when I got home today so I promptly installed it and went for a spin. Midrange tip/manifold pressure ratios were around .85:1. 19 to 23.5. Top end it picked up to a peak of 42/22.5 or 1.87:1. This didn't vary much throughout the gears, maybe a PSI or so. Even more amazing: Ray said this gauge is off about 4psi on the top end of the range over his "good" gauge he used for his measurements. SO, tip is 37/22.5 or 1.69:1 I was expecting a shade under 2:1 but this is darned impressive. I'm going to drive with it for a week or so and further measure TIP under all kinds of driving circumstances and boost levels. I'm also enlisting/conscripting other local K04 guys to get some more data Thanks for letting me borrow the tester Ray! __________________ 2002 S4 Avant, 6spd. Bone stock. <a href="http://www.autospeed.us"> </a> Caveat: Any advice I express regarding potential tuning and such is purely informational. If your knowledge and abilities are not up to the task, no amount of advice can assist.

10-04-2005, 01:40 PM	#2
ryans4 AudiWorld Super User Garage is empty, add now Join Date: Apr 2000 Posts: 7,308	can you explain why 1.65:1 is darned impressive? i must have skipped the TIP chapter in Maximum Boost. __________________

10-04-2005, 01:46 PM	#3
VonK :: Retired AudiWorld Super User Garage is empty, add now Join Date: Nov 2000 Posts: 4,222	Where'd you pick up TIP? __________________ VonK *"Not dead yet...!"* (Monty Python) *"A little bit of knowledge is a dangerous thing."* (unknown) vonk at bayarea dot net All statements, quotations and illustrations by VonK are to be construed as his opinions only, and not as advice, consent, recommendation, guidance, instruction, and/or suggestion.

10-04-2005, 01:49 PM	#4
RAD69 Member Garage is empty, add now Join Date: Sep 2001 Posts: 3,015	I should try that too! BTW - my Audi is finally my daily driver again! You gotta go for a spin again, this thing is fast... Time to hook up the AVC-R, I want your help programming it. Pwleeease! __________________ Gone but not forgotten - 1998.5 ASS4

10-04-2005, 01:51 PM	#5
Funkweasel AudiWorld Super User Garage is empty, add now Join Date: Nov 2001 Posts: 10,137	Write it up!! Write it up!! Anxious to hear how its working. ;-)

10-04-2005, 01:51 PM	#6
Mike2kS4 AudiWorld Super User Garage is empty, add now Join Date: Jun 2002 Posts: 12,096	Well, TIP is a pretty nasty thing... Basically, the higher the TIP the more problems you have regarding having exhaust properly expelled out of the engine and through the turbo itself. You can have exhaust gases revert into the combustion chambers and choke the entire system. Normal TIP for an OE designed turbocharger is around 2:1. Some are more, some are less. TIP is affected by the AR of the turbine housing and the turbine outlet size as well as the size of the turbine itself. Being as I have an overboosted version of a turbocharger with a very small turbine/housing, anything under 2:1 is damned impressive. __________________ 2002 S4 Avant, 6spd. Bone stock. <a href="http://www.autospeed.us"> </a> Caveat: Any advice I express regarding potential tuning and such is purely informational. If your knowledge and abilities are not up to the task, no amount of advice can assist.

10-04-2005, 01:52 PM	#7
Mike2kS4 AudiWorld Super User Garage is empty, add now Join Date: Jun 2002 Posts: 12,096	EGT bung :) __________________ 2002 S4 Avant, 6spd. Bone stock. <a href="http://www.autospeed.us"> </a> Caveat: Any advice I express regarding potential tuning and such is purely informational. If your knowledge and abilities are not up to the task, no amount of advice can assist.

10-04-2005, 01:52 PM	#8
Mike2kS4 AudiWorld Super User Garage is empty, add now Join Date: Jun 2002 Posts: 12,096	Sure thing. You've just conscripted yourself to the TIP tester though ;) __________________ 2002 S4 Avant, 6spd. Bone stock. <a href="http://www.autospeed.us"> </a> Caveat: Any advice I express regarding potential tuning and such is purely informational. If your knowledge and abilities are not up to the task, no amount of advice can assist.

10-04-2005, 01:53 PM	#9
Funkweasel AudiWorld Super User Garage is empty, add now Join Date: Nov 2001 Posts: 10,137	With the amount of air you're moving, that is very impressive. Clearancing seemed to work, didn't it? Heh.

10-04-2005, 01:53 PM	#10
Captain Matt, I be AudiWorld Expert Garage is empty, add now Join Date: Oct 2001 Posts: 32,081	be interesting to see what it is on a turbo that isnt clearanced / ported on the hot side __________________ Support Innovation for the B5 Platform - www.autospeedperformance.com www.vastperformance.com B5 S4 Forum Cliff's Notes B5 S4 RNS-E Nav+ Installation

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