In the hot few days we have had the ol' Cq has slowed noticeably and was wondering if there is an easy way to monitor the IAT. Came back after a blast yesterday and although the chargecooler was only warm, the pipe over the cam cover to the throttle body was too hot to touch and am starting to wonder if an aquamist water injection kit would help. Performance drop at high revs in hot weather is very noticeable and am pretty sure I can hear the 'tinkle' of knock too...
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IAT monitoring and water injection
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You can buy an air temperature gauge and sender, or are you looking to log air temperatures? If so I would imagine a more expensive bit of kit may be required.Current-2004 Impreza PPP wagon
Sold-92 3B coupe-RS2+, 996s, konis, rear torsen, forged rods........
Sold ABY-stock
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Get a plastic pressure pipe (if available). Won't heatsoak like the steel ones. Painting it silver and putting some aluminum tape on the bottom of it helps further.1995 RS2 on Alcohol (6.8sec 100-200km/h)
1994 80E Avant
1986 2L Golf 2 on Alcohol
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Easy way is to use Vagcom to monitor the IAT sensor. My crappy old laptop dosent have any battery life so i wanted something a little more simple.
So, i bought one of these to play with, http://cgi.ebay.co.uk/LCD-Digital-Th...item1c131c213a
Silly cheap and work very well. Updates once a second so it responds quickly to changes. The plan is to place the sensor just before the throttle body to monitor the air going into the manifold. I havent figured out exactly how to mount it yet.....cutting a hole in a spare throttle body boot is most likely.
The other thought i had was to compare the temp sensor range with the IAT sensor. Would be sweet if they were similar so you could just wire the display up to it...
I have a plastic intake pipe and RS2 inter cooler to fit, so the overall plan was to try and get some baseline temp figures daily driving, and peak temps under WOT acceleration. Then change a part at a time and compare the results. Mainly just for the fun of it91CQ20v - Gone to a new home
93UR-S4 - The Magic Carpet
94S2Bus - The Emerald Express
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Could try and log the IAT sensort voltage or resistance using a multimeter or something more exotic if you've not got VAGcom.
What sort of feed to the inlet have you got, cheap boost if it's not too good at the mo.
WI is an interesting idea, I've looked at it a few times, Snow Performance are a good bet from the states, Joe @ Axis was doing the MAF voltage contraolled kits for about $400, cheaper and more complex than Aquamist (you pay a lot for their pump).Cheers'en, AndyC
1994 ABY Coupe - Projekt Alpinweiss
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I can definetly recommend the water injection. I have an aquamist plumbed up on mine and makes a big difference when its on boost, using a 50/50 mix of washer fluid to water and works a treat. It is just set to switch on at a set boost and delivers the same amount from there onwards. Can get a more fancy mappable version, but didnt see the need yet,Greg
S2Forum.com Administrator & Webmaster
'93 Coupe with a few tweeks
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Originally posted by Rusty View PostCould try and log the IAT sensort voltage or resistance using a multimeter or something more exotic if you've not got VAGcom.
What sort of feed to the inlet have you got, cheap boost if it's not too good at the mo.
WI is an interesting idea, I've looked at it a few times, Snow Performance are a good bet from the states, Joe @ Axis was doing the MAF voltage contraolled kits for about $400, cheaper and more complex than Aquamist (you pay a lot for their pump).
Where can you get the plastic inlet pipe?
Performance was great in early April in outside temps of 3 degrees
Charge cooler water circuit is also cool so looks as tough water injection prior to cam cover pipe would work well.... Could do with finding someone who has fitted this already and has before and after figures...
Yesterday performance dropped off markedly in 3rd after 5800rpm whilst making an old 328I Beemer look slow..1986 Coupe q - 2281cc 3B, chargecooler, 2.75" exh & downpipe, ported head, water injection, CGR box, modified MD357 turbo, 440cc injectors, high power coil.
2004 A4 2.5TDi convertible, re-mapped to 180bhp
2011 A5 sportback 3TDi-Backbox delete, remap
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Originally posted by 20Vcqdriver View PostThink I'll try and wire in my fluke multimeter and measure resistance first in stock mode and then homefry mode. Then measure the IAT sensor off the car in an oven with a temp meter.
Where can you get the plastic inlet pipe?
Performance was great in early April in outside temps of 3 degrees
Charge cooler water circuit is also cool so looks as tough water injection prior to cam cover pipe would work well.... Could do with finding someone who has fitted this already and has before and after figures...
Yesterday performance dropped off markedly in 3rd after 5800rpm whilst making an old 328I Beemer look slow..
I have the biggest jet the engine can handle, I very occasionally get a back fire when the water comes in so know i cant go bigger... all adds to the experience..
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If your air temps are creeping up much more than approx 40 celsius then the ECU is going to try and reduce ignition if it detects knock... then it will reduce boost if it still hears knock. What fuel are you running by the way.
This charge cooler is a bit of an unknown... where is its source of cold water to aid the reduction in air temps when cruising around on hot days ?
Might the charge cooler be suffering from heat soak during this weather ?
You definitely need an IAT monitor - you could just track the resistance value of the 3B thermistor as we can correlate that to air temp.Paul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don't
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Originally posted by S2central.net View PostIf your air temps are creeping up much more than approx 40 celsius then the ECU is going to try and reduce ignition if it detects knock... then it will reduce boost if it still hears knock. What fuel are you running by the way.
This charge cooler is a bit of an unknown... where is its source of cold water to aid the reduction in air temps when cruising around on hot days ?
Might the charge cooler be suffering from heat soak during this weather ?
You definitely need an IAT monitor - you could just track the resistance value of the 3B thermistor as we can correlate that to air temp.
Always use V-power fuel which is now 99 octane.
The water rad for the charge cooler sits in front of the main rad with its own fan and thermo switch.
Looks like I need to put water injection on my birthday list if the IAT's are shown to be high....1986 Coupe q - 2281cc 3B, chargecooler, 2.75" exh & downpipe, ported head, water injection, CGR box, modified MD357 turbo, 440cc injectors, high power coil.
2004 A4 2.5TDi convertible, re-mapped to 180bhp
2011 A5 sportback 3TDi-Backbox delete, remap
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What is pumping the water for the charge cooler - is it engine coolant ?Paul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don't
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Yes - if you log IAT resistance, I can convert that to air temp - well anyone can with the graph... let me dig it outPaul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don't
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