Excellent write-up on a mod for the S4 after-run pump

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Nige_RS4
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Excellent write-up on a mod for the S4 after-run pump

Post by Nige_RS4 » Thu Jun 17, 2004 12:16 pm

Been looking for this for ages now - seems like someone's already done it. This mod basically replaces the sensor switch that operates the pump which circulates water around the turbo casing after the engine is switched off. You won't nornally hear this operating unless you track your car. This is basically on OEM turbo timer - gotta be a must do mod for any S4.

http://forums.audiworld.com/s4/msgs/1629709.phtml

Nige
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sitas3
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Post by sitas3 » Fri Jun 18, 2004 6:05 pm

great find Nige thanks. seems to be a far simpler method than fitting a turbo timer..
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Post by Dippy » Mon Jun 21, 2004 1:00 pm

Yes - I did this for my car ages ago. I even posted the details on this site...
2001 Silver S4 Avant
AmD remap, APR R1 DVs, APR bipipe, Full Miltek exhaust
H&R coilovers, AWE DTS, Porsche front brakes, Short-shifter, 18" RS4 replicas
Defi-HUD boost gauge / turbo-timer (with afterrun pump modification), Phatbox
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Nige_RS4
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Post by Nige_RS4 » Mon Jun 21, 2004 8:43 pm

Dippy, must've missed that one - I asked the question not so long ago here and the only response I got was from Dan and his wiring mod to force it into after-run mode.

Any downsides ? i.e. does it affect the alarm system ??

Nige.
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KayGee
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Post by KayGee » Tue Jun 22, 2004 9:13 pm

parts ordered, will do it Sat if sun comes out
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S4 OXON
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Post by S4 OXON » Wed Jun 23, 2004 6:45 pm

will it keep the turbo in better health for longer ? which seem's cheaper option, how much £
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Nige_RS4
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Post by Nige_RS4 » Sun Jun 27, 2004 2:30 pm

S4 OXON wrote:will it keep the turbo in better health for longer ? which seem's cheaper option, how much £
That's the theory - difficult to prove though - all I know is that is costs less than £20 and will reduce temperatures around the turbo housing for 10mins after shutdown.
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Post by Dippy » Tue Jun 29, 2004 2:17 pm

http://www.rs246.com/modules.php?op=mod ... ic&t=27175
http://www.rs246.com/modules.php?op=mod ... ic&t=18058
http://www.rs246.com/modules.php?op=mod ... pic&t=6734
2001 Silver S4 Avant
AmD remap, APR R1 DVs, APR bipipe, Full Miltek exhaust
H&R coilovers, AWE DTS, Porsche front brakes, Short-shifter, 18" RS4 replicas
Defi-HUD boost gauge / turbo-timer (with afterrun pump modification), Phatbox
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sitas3
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Post by sitas3 » Tue Jun 29, 2004 3:11 pm

correct me if i'm wrong Dippy, but your method involves cutting wires and using other bits whereas Nige's solution involves just replacing the actual sensor with one which switches the pump on at a lower water temp. Seems logical to me - anyone tried this yet??

which method is best or do they both achieve the same results but one with more effort?
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Nige_RS4
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Post by Nige_RS4 » Tue Jun 29, 2004 3:13 pm

I fitted mine over the weeknd - 5 minute job - cuts in now after a hard run - doesn't seem to affect the factory alarm system or anything - good mod IMHO.

Nige.
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sitas3
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Post by sitas3 » Tue Jun 29, 2004 4:43 pm

Nige_S4 wrote:I fitted mine over the weeknd - 5 minute job - cuts in now after a hard run - doesn't seem to affect the factory alarm system or anything - good mod IMHO.

Nige.
great result! :D
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sitas3
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great write-up on a mod for the S4 after-run pump -RS4's too

Post by sitas3 » Sun Aug 22, 2004 4:46 pm

This alternative temperature switch was fitted to my RS4 this weekend - it works a treat and certainly helps to cool the oil temp quicker too. The pump and radiator fan do indeed activate after turning off the engine, but I've noticed the following:

1. After normal (pottering around town) type driving, there is about a minutes delay before the pump and fan starts up after turning off the ignition. I presume that the underbonnet temps have then risen sufficiently which then causes the new switch to activate.

2. If the car has had a good blast beforehand, then it comes on straight away after turning off the ignition.

Thanks for digging out the info Nige.
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Post by Dippy » Mon Aug 23, 2004 12:20 pm

Your S4 didn't last long!
2001 Silver S4 Avant
AmD remap, APR R1 DVs, APR bipipe, Full Miltek exhaust
H&R coilovers, AWE DTS, Porsche front brakes, Short-shifter, 18" RS4 replicas
Defi-HUD boost gauge / turbo-timer (with afterrun pump modification), Phatbox
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Nige_RS4
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Post by Nige_RS4 » Mon Aug 23, 2004 7:25 pm

any one considering this mod should be aware that there is an updated metal clip (to replace the plastic clip fitted to earlier cars)

Nige.
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