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Author Topic: A Mod To Help Keep Your Busa From "Over-Heating"  (Read 39215 times)

Offline JINKSTER

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A Mod To Help Keep Your Busa From "Over-Heating"
« on: March 22, 2005, 09:06:46 PM »
I'm an old hand at bikes but a bit of a newbie in BusaLand here as I just got mine last week so forgive me if this has already been covered or is in the wrong forum but just something I wanted to offer/share here.

It has come to my attention through one of my many learned cohorts that the Busa's IAT (Intake Air Temperature) Sensor is somewhat poorly located as stock whereby in it's stock location is inserted in the underside of the airboxes left side and is located but an inch or so directly above the rear portion of the engines valve cover....

The Claim???....when caught in high heat summertime traffic jams the fairing keeps the heat entrapped on the now not moving bike and the IAT Sensors metal base (which is located in a very hot spot near the engines valve cover) begins to get saturated with heat rising from the valve cover and the IAT Sensor begins giving the ECU "Irroneousely High Temperature Reports"...and in turn???...the ECU begins compensating the fuel map to accomodate the irroneous high temps...."LEANER"...which causes the engine to run even HOTTER yet...in a viscouse circle until....your temp gauge says..."Pull Over".

The IAT Sensor Relocation Mod "Jinksters Way"

1st???...Identifying The IAT Sensor Location...(aka..."The Culprit")





To remove the IAT Sensor simply depress the locking tab to unplug the connector and spin it out with a 19mm open end wrench.
 
Next???...I found that with a considerable amount of insertion pressure that a 27/64ths auto panel fastener fits and plugs the 12mm x 1.50 threaded hole in the airbox just dandy (good luck finding a 12mm x 1.50 bolt) and a 7/16ths ID Rubber Grommet is just the ticket to hold the the IAT Sensor in it's new found home....read on....



Next???...install a 9/16ths hole for your 7/16ths ID rubber grommet in the top of the left ram air duct just behind your left directional...this location gets the IAT Sensor away from the direct engine heat and out in front of the engines radiator in a much more reasonable location for truer reporting of actual intake air temps.



After you clean up the burrs around the freshly drilled hole???....put a little armour-all or silicone spray on your rubber grommet and insert it in the newly drill location.



Now???...You'll actually hafta carefully spin your IAT Sensor through the rubber grommet and when it clears the threads???...you'll actually "FEEL" the sensor pop into place as the rubber grommet seats into the senosors thread relief...with the sensor rubber mounted and very secure in it's new and far better home.



Now we're gonna hop around a bit here and plug the airbox hole the sensor came out of....and using a gas/oil resitant silicon sealant squeeze a generous bead around the underside of the fasterners head/flange like so....



Then simply but firmly push it up and into the same hole the IAT Sensor came out of then wipe away the excess silcon sealant and viola...the airbox is plugged.



Next use black electrical tape and just wrap up a 2 wire mini harness using about 30"s of both 20ga Green and 20Ga Black stranded wire then strip the ends and connect the proper colors to the proper colors and route like so...



Then hook up and tape up the other end using the stock IAT Sensors Plug then plug'er in!!!...



Then???...starter up...warmer up...adjust the idle...then button'er up and Viola!!!...Your IAT Sensor is happily relocated and the next time you and your busa are stuck in a hot traffic jam???....You can smile with confidence at the hours time and $10 spent...Relocating Your IAT Sensor.

L8R, Bill.
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Offline coop

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A Mod To Help Keep Your Busa From "Over-Heating"
« Reply #1 on: March 22, 2005, 10:38:47 PM »
Maybe its just me but my busa has never come close to overheating in traffic of any kind.
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Offline po boy

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« Reply #2 on: March 22, 2005, 10:44:35 PM »
Quote from: coop
Maybe its just me but my busa has never come close to overheating in traffic of any kind.



Then you've never ridden it in stop and go traffic at all, esp. not in a hot area like the deep south or such.
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Offline coop

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« Reply #3 on: March 22, 2005, 10:51:34 PM »
Quote from: po boy
Quote from: coop
Maybe its just me but my busa has never come close to overheating in traffic of any kind.



Then you've never ridden it in stop and go traffic at all, esp. not in a hot area like the deep south or such.


I have ridden in lots of stop and go traffic but I live in upstate ny so I guess the humidity of the deep south has a lot to do with it.
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Offline SuperGrizz

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A Mod To Help Keep Your Busa From "Over-Heating"
« Reply #4 on: March 22, 2005, 11:08:35 PM »
Just add another fan. But the only time I had overheating problems was the first time I went turbo.
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Offline Campbell

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« Reply #5 on: March 22, 2005, 11:47:58 PM »
Florida. Stop and go traffic after a haul-ass ride. Temp 95+. It gets hot, but never close to overheating. I feel like I'm overheating, though. :?
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Offline nemsis

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A Mod To Help Keep Your Busa From "Over-Heating"
« Reply #6 on: March 23, 2005, 02:03:23 AM »
no problems here in the windy city, but nice write-up :beechug:
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Offline ICEMANN

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A Mod To Help Keep Your Busa From "Over-Heating"
« Reply #7 on: March 23, 2005, 06:06:01 AM »
Actually moving the IAT sensor to the left air ram tube has been a mod thats been around for a number of years.  I moved mine back in 2001.

Basically the heat from the engine can cause the air box reading location to somewhat false.  I moved mine and switched to engine ICE and never have had a problem since.

Depending on how much stop/go riding in high humid/heat spots your in you can also switch out the thermastat sensor IN the radiator to the one made by honda.  Direct swap.  The honda sensor activates the fan at a much lower temp so your fan comes on sooner.   :lol:

Good post w/pics.

Dennis had a mod here a while back for moving the other sensor as well.

JD
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Offline Shamrock

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A Mod To Help Keep Your Busa From "Over-Heating"
« Reply #8 on: March 23, 2005, 06:50:24 AM »
Moving your IAT Will not help over heating it will help Performance.So  cooler air will pass over it,and trick the ecu to think that there is cooler air into the engine. If you want to stop from over heating  put a switch on your Temp sensor on the left hand side of the radiator.
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Offline DENNIS8269

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« Reply #9 on: March 23, 2005, 08:50:23 AM »
All of this said. I have to say that was the best illustration of this modification I have seen. GOODJ OB!
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Offline JINKSTER

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I don't think so 469 Boy...
« Reply #10 on: March 23, 2005, 08:56:50 AM »
Quote from: 469 Boy*Robert Kelly
Moving your IAT Will not help over heating it will help Performance.So  cooler air will pass over it,and trick the ecu to think that there is cooler air into the engine. If you want to stop from over heating  put a switch on your Temp sensor on the left hand side of the radiator.


And what a very different and very wrong way of saying the same thing.

The IAT Sensors job is to accurately report incoming air temps....

The fresh incoming air is moving through that box so quickly it isn't getting a chance to become very heated at all...however...

The IAT Sensors base and body are made of brass...and it sits there but an inch or so directly over the rising heat of a hot engine...

Relocating the IAT Sensor helps it to report air temps in a more accuratly as the sensor itself isn't being influenced (quite as badly) by that rising engine heat.

I can see there's probably very little I can contribute to this board that hasn't already been covered or...issues who's remedies are not already cast in stone with widely accepted and established fixes already in place and not generally recognized as..."issues open for discussion"....in which case???...I apologize for stepping on any long term toes and bid you gentlemen a fond adue.

L8R, Bill.
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Offline Mr. Demeanor

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« Reply #11 on: March 23, 2005, 09:09:41 AM »
Lots of guys have moved their IAT's but thats a nice instructional thread you put togethor. The other option, that I did, is to leave the sensor where its at and wrap the exposed part with some foam insulation..
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Offline PhantomBusa

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« Reply #12 on: March 23, 2005, 09:29:45 AM »
JINKSTER

I think your post was superb man.  Great detail and clear pictures that explain every thing.  Some people will just be negative, others will appreciate your efforts as I do.  Even if the subject has been covered, it's always nice to see anothers point of view.  SOme guys can do the same mod, just in a neater way.  Your mod is the cleanest I have seen so far!  GREAT JOB.
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Offline HayaBusa Knight

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A Mod To Help Keep Your Busa From "Over-Heating"
« Reply #13 on: March 23, 2005, 09:43:58 AM »
Ok so the Temp Sensor should have a switch put on it as well or just just the As well as moving IAT Sensor, can the Sensor be moved to an even better location and it so were would that be? for the best results and most accurate and percise sensing of the air?


Reason I ask is I want to add a 2nd fan looking at either a gsx1000 or a gsx750 fan and make them both run same time as the stock fan does.
As well as this IAT mod and want to move it too most efficent area/placement.

I have to disagree with ICEMANN PURPLE ICE after USING 40 BELOW. Then going to use Purple Ice their after with Distilled Water.
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Offline gotabusa

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A Mod To Help Keep Your Busa From "Over-Heating"
« Reply #14 on: March 23, 2005, 10:38:39 AM »
Great post and pics JINKSTER. Thanks for the effort.
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Offline HayaBusa Knight

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« Reply #15 on: March 23, 2005, 11:11:27 AM »
JINKSTER



Is that the most efficent place to place the IAT? What about putting a switch on the TEMP SENSOR, As well as placing a second fan to come on same time stock fan comes on? aka a gsx1000 or gsx750 fan? as well as placing new sensors with the stock and the new fan, honda has a sensor which will make it come on sooner. Would this not surfice as well? Along with maybe a better more efficent place for the IAT than this mod shows or is this most efficent?
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Offline coop

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Re: I don't think so 469 Boy...
« Reply #16 on: March 23, 2005, 12:33:27 PM »
Quote from: JINKSTER
Quote from: 469 Boy*Robert Kelly
Moving your IAT Will not help over heating it will help Performance.So  cooler air will pass over it,and trick the ecu to think that there is cooler air into the engine. If you want to stop from over heating  put a switch on your Temp sensor on the left hand side of the radiator.


And what a very different and very wrong way of saying the same thing.

The IAT Sensors job is to accurately report incoming air temps....

The fresh incoming air is moving through that box so quickly it isn't getting a chance to become very heated at all...however...

The IAT Sensors base and body are made of brass...and it sits there but an inch or so directly over the rising heat of a hot engine...

Relocating the IAT Sensor helps it to report air temps in a more accuratly as the sensor itself isn't being influenced (quite as badly) by that rising engine heat.

I can see there's probably very little I can contribute to this board that hasn't already been covered or...issues who's remedies are not already cast in stone with widely accepted and established fixes already in place and not generally recognized as..."issues open for discussion"....in which case???...I apologize for stepping on any long term toes and bid you gentlemen a fond adue.

L8R, Bill.


I think what 469 is trying to point out is that the IAT sensor isn't responsible for cooling issues it's job is for fuel related issues and sending this data back to the ecu to adjust air and fuel ratio. The temp sensor for the fan would be the one to relocated or change to a lower temp unit.
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Offline JINKSTER

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coop...
« Reply #17 on: March 23, 2005, 12:53:11 PM »
"I think what 469 is trying to point out is that the IAT sensor isn't responsible for cooling issues it's job is for fuel related issues and sending this data back to the ecu to adjust air and fuel ratio."

Exactly...but if the IAT Sensor is responsible for "sending this data back to the ecu to adjust air and fuel ratio" and the temp of the sensor itself is greater than that of the incoming air???...now your ecu is getting BS information from the overheated IAT Sensor...and the ecu is now adjusting the mix leaner, hence, hotter.

At this point I would love to recite old clich'es like "There's More Than One Way To Skin A Cat" or???.."1/2 doz of this vs 6 of that"...or???...You say tomato I say Tomotoe" but...this simply isn't the case...and adding fans and switches or moving other sensors may help to ease the affects of the root cause problem but it will not efficiently eliminate it.

Now....I know I'll not change the strong opinions of those who disagree so...there ya'll have it...mho...at "No Charge"...so if nothing else???......at least the price was right!!! :lol:

L8R, Bill. 8)
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Offline 02 busa se

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A Mod To Help Keep Your Busa From "Over-Heating"
« Reply #18 on: March 23, 2005, 02:16:41 PM »
best write up ive seen in a long time....what about replacing the temp switch for the fan to a lower temp one...give the bike a little head start if its getting too hot. Ive been in a 1 hour cruise..bumper to bumper pushing the bike and the only thing that got over-heated was my legs..and it was 80's outside.
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Offline BBP1 Busa

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A Mod To Help Keep Your Busa From "Over-Heating"
« Reply #19 on: March 23, 2005, 02:37:03 PM »
Depending on how much stop/go riding in high humid/heat spots your in you can also switch out the thermastat sensor IN the radiator to the one made by honda.  Direct swap.  The honda sensor activates the fan at a much lower temp so your fan comes on sooner.   :lol:

Iceman, The honda sensor you mention has the same connector as the busa does?  if so what is the honda PT# for the temp sensor. If you don't mind me asking.
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Offline ICEMANN

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« Reply #20 on: March 23, 2005, 02:53:47 PM »
Will someone repost the "HONDA" part number for the temp sensor for the fan that would be to lower temp turn on for the fan unit.

yu know what I mean
JD
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Offline CID

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« Reply #21 on: March 23, 2005, 02:59:48 PM »
Quote from: 469 Boy*Robert Kelly
Moving your IAT Will not help over heating it will help Performance.So  cooler air will pass over it,and trick the ecu to think that there is cooler air into the engine. If you want to stop from over heating  put a switch on your Temp sensor on the left hand side of the radiator.



So now understanding what he meant by HELP, do you still disagree that it won't HELP the situation?



Or were you trying to say that it won't help as much as your way? :mrgreen:
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Offline Busa@11K

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Re: I don't think so 469 Boy...
« Reply #22 on: March 23, 2005, 03:02:20 PM »
Quote from: coop
I think what 469 is trying to point out is that the IAT sensor isn't responsible for cooling issues it's job is for fuel related issues and sending this data back to the ecu to adjust air and fuel ratio. The temp sensor for the fan would be the one to relocated or change to a lower temp unit.


Yep ...

Quote from: JINKSTER
Exactly...but if the IAT Sensor is responsible for "sending this data back to the ecu to adjust air and fuel ratio" and the temp of the sensor itself is greater than that of the incoming air???...now your ecu is getting BS information from the overheated IAT Sensor...and the ecu is now adjusting the mix leaner, hence, hotter.


What kills you the most is the fact that there is virtually no air going through the radiator in stop/go traffic.  Sure, a slightly leaner A/F at idle might add a hair more heat ... but face it, if there is no air going through the radiator the engine temps will go up fast no matter how rich the A/F is.

Adding another fan to get more air through the radiator is the key.  Also, using better coolant mix ratio and/or coolant system additives to increase heat transfer is what needs to be done.

Relocating the IAT does more for running performance than keeping the bike cool in hot stop/go riding.  Good info though.
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Offline CID

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« Reply #23 on: March 23, 2005, 03:09:16 PM »
Anybody else from a climate that's not hot wanna chime in??  :lmao:
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Offline Busa@11K

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« Reply #24 on: March 23, 2005, 03:13:42 PM »
Quote from: CID
Anybody else from a climate that's not hot wanna chime in??  :lmao:


I'll bet you that if someone makes just the IAT relocation mod on a bike that typically overheats, and then rides in the same hot stop/go situations that his bike is still going to overheat. :yes:  You want to make the bet?  Relocating the IAT is not going to completley cure an overheating problem.

It doesn’t have to be very hot (90+) to get a Busa (or any other water cooled bike for that matter) to overheat.  Just let it sit and idle for 5 to 10 minutes and you’ll se the temp gage head towards “H”.  Every bike I've ever seen does not have a good enough radiator fan to keep it cool for very long.

Airflow through the radiator is what primarily cools the engine.  This is why the only guys who have fully cured overheating are the ones who put a 2nd fan on the radiator.
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