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  1. #1
    Join Date
    Feb 2014
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    5,130

    EXACTLY what is it like to race with an Interchiller?

    🚙 Racing from outside the car & interview with driver at 6min mark 🚙

    Watch a low 10sec LSA VF GTS, heavily overdriven supercharger to 44% with a 9.55/2.55 pulley combo and how the intake temps respond before/during and after the run.

    If you wish to fast forward here are the times:
    55sec burnout (5c IAT2)
    1:55 staging (7c IAT2)
    2:08 finish line (51c IAT2)
    5:10 collecting time slip (10c IAT2)
    6:00 back to staging lanes (8c IAT2)

    Aftert the 6min mark video of the car doing a 1/4 mile pass and interview with the owner Moey.

    Car built by HAUS of LS
    Tuned by LSX Tuning

    Mods include:
    ✔️Stage 1 Race Chiller + comp solenoid
    ✔️12L reservoir
    ✔️LSA Lid and Blower Spacer Plates
    ✔️Thermal Blanket
    ✔️Camshaft
    ✔️2.55" top pulley, 9.55 lower pulley
    ✔️Harrop Pod Filter
    ✔️Injectors
    ✔️Headers/Exhuast
    ✔️Pump 98 fuel

    Keep in mind that with this level of blower over drive of 44% intake temps without a chiller would be in the 80c range and ignition timing would also be far less, thus a lot less HP.


    2014 HSV VF GTS
    2017 HSV GTSR
    http://www.facebook.com/ForcedInductionInterchillers
    Australia's Fastest 6.2L 1900 LSA VF GTS with a Stock Bottom End
    9.700 @143.14mph 17/July/2017
    V-Box Results 0-100km/h in 2.47sec

  2. #2
    Join Date
    Jan 2016
    Location
    Perth, W.A.
    Posts
    102
    Hey Kirk, how far really could you overdrive an LSA blower with a stage 1 chiller and associated bits from you, where it's still reliable with say 5xxx kms annually and drag strip work?

    Would the speed generated destroy the bearings before the heat would, or something else? As if its not heating up past 50'C, and there's non-chiller cars with a bit of boost seeing 70'C+ at the end of the track, I can't see heat being an issue?

    Who wants to be a test mule

    PS: you should create longer videos such as this one for YouTube going over customers cars and work done etc.
    2016 VF Clubsport LSA - FI Interchiller & Lid spacer & 12L res, 18% Crank OD, Harrop Pod Intake making 552.8rwhp. Best time = 12.171 @115.26mph 1.836 60' on a street tyre.

  3. #3
    Join Date
    Feb 2014
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    We've seen guys over drive them as far as 60%, I've personally taken mine as high as 50% over drive.
    Everything above about 40% becomes a point where it's not making any additional boost pressure, the point however is so that when you do enter boost it comes on faster and harder and in the lower RPM range you can be making more HP.

    So it's a give and take relationship above 40%, you can potentially lose some top end HP at the sacrifice of leaving the line harder (being on a higher level of boost earlier) making a little more low down HP.

    The increased rotor speed isn't much of an issue after all the cars are only at WOT for 10sec or less, on the street even less than 10sec.

    As the chiller is constantly cooling on the street/track there isn't a lot of heat build up as the rotors and bearings will be getting cooling from the recycled air going through the bypass valve (one of the reasons the LSA gets colder than other blower types).

    I've not ever had bearing issues even with high over driven percentages however I am aware of guys without chillers who have had issues and they basically say you hear the bearings and at that point it's time to change them out. There isn't a failure as such you just hear increased noise and know it's time to swap them out for new ones.
    Like anything everything has a life span, and the bearings are no different they will wear out at some point.

    Over driving the blower obviously wears them out faster from the increased revolutions per minute and also the friction/heat created from that increase RPM, however you add the chiller into the mix and the bearings will be colder than without the chiller.

    2014 HSV VF GTS
    2017 HSV GTSR
    http://www.facebook.com/ForcedInductionInterchillers
    Australia's Fastest 6.2L 1900 LSA VF GTS with a Stock Bottom End
    9.700 @143.14mph 17/July/2017
    V-Box Results 0-100km/h in 2.47sec

  4. #4
    Join Date
    Jan 2004
    Location
    Perth, WA
    Posts
    7,826
    Quote Originally Posted by GenF-GTS View Post

    The increased rotor speed isn't much of an issue after all the cars are only at WOT for 10sec or less, on the street even less than 10sec.
    That's like saying you can spin your stock bottom end to 8000rpm and it won't hurt the bearings because it's only there for a couple of seconds.

    You're also increasing its speed across the board so where it was spinning at 10k at low engine rpm previously, it's now doing 14k which is close to its factory max. It will constantly be running at higher rpm, not just at engine redline.

  5. #5
    Join Date
    Feb 2014
    Posts
    5,130
    The analogy youíve given is true when related to an engine but itís not the same with these blowers and itís not the same when that one line is taken out of context of everything else that was written.

    The blowers are fine at high rpms thousands of guys run 40-60% overdrive and have no issues.
    The very few who do have an issue itís just a case of hearing the bearings getting noisy and knowing itís time to change them out.

    Eg no failure as such is reached because you become aware of the bearing fatigue prior to it failing

    2014 HSV VF GTS
    2017 HSV GTSR
    http://www.facebook.com/ForcedInductionInterchillers
    Australia's Fastest 6.2L 1900 LSA VF GTS with a Stock Bottom End
    9.700 @143.14mph 17/July/2017
    V-Box Results 0-100km/h in 2.47sec

  6. #6
    Join Date
    Jan 2004
    Location
    Perth, WA
    Posts
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    Quote Originally Posted by GenF-GTS View Post
    The analogy youíve given is true when related to an engine but itís not the same with these blowers and itís not the same when that one line is taken out of context of everything else that was written.
    Ok, we'll go back to this paragraph.
    Quote Originally Posted by GenF-GTS View Post
    Over driving the blower obviously wears them out faster from the increased revolutions per minute and also the friction/heat created from that increase RPM, however you add the chiller into the mix and the bearings will be colder than without the chiller.
    You're assuming the bearings are air cooled, which in this application, I highly doubt. Have a google search, I'd bet you'll find a sealed bearing.

    Second, the air doesn't constantly lap the supercharger. The air isn't hot until it's compressed which is obviously post rotor. The engine consumes the air coming thru the throttle body at small openings, the bypass valve that you speak of is closed as the entire system is in a vacuum. Ie engine is consuming more air than is coming in. It wouldn't make any sense to open that valve as it's all a vacuum. That valve only opens at very high vacuum, generally deceleration.

    Quote Originally Posted by GenF-GTS View Post

    The blowers are fine at high rpms thousands of guys run 40-60% overdrive and have no issues.
    The very few who do have an issue itís just a case of hearing the bearings getting noisy and knowing itís time to change them out.

    Eg no failure as such is reached because you become aware of the bearing fatigue prior to it failing
    That's like saying a piston didn't exit the block but the big ends are noisy so it's not technically a failure.

  7. #7
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    Feb 2014
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    No the bearings are not air cooled.
    However the bearings are in contact with the rotors/rotor shafts.

    And your theory about the bypass valve is entirely wrong. So I'll cover that and then circle back to the bearings running a touch cooler with a chiller than without.

    The bypass valve is open under all conditions other than when in boost, at which point it closes and allows the blower to create boost pressure. When the car is at idle, part throttle cruise or any circumstance where it's not in boost the bypass valve is 100% open.

    (Just ask some of the guys in the US who thought it would be a good idea to close the bypass valve under all conditions what that results in....the answer is the rotors grow in size and seize up on the blower housing, as the rotors are getting hotter and hotter from simply daily driving duties, expand and lock up the blower and also lock up the bearings/cook the bearings, plenty of information here obtained from Jokerz Performance who deals with these blowers all the time).

    Excess air that the engine doesn't consume is then pushed back out the bypass valve and recycled over and over and over again. In doing so this cooled recycled air is constantly cooling the blower rotors which are attached to the bearings. Hence "to some degree" the bearings will be cooler than without a chiller.


    Supercharger bearings wearing out and making some noise is far far different than internal engine noises.
    It's has simple bearings that are designed to spin at very high RPM's 20,000+ rpms and over time like anything they will and do wear out, the bearings obviously wear out faster the more you over drive your charger. However since it's a serviceable item when you hear it making noise or if you have fears that they are worn out you change them out.

    I know guys in the US who get their blower rotors re coated every 1-2 years along with the bearings changed out and fresh oil put in the blower again, it just becomes part of servicing the blower.

    The harder you work something the more work you need to put in to keep it running at that level of performance.
    Last edited by GenF-GTS; 3 Weeks Ago at 12:35 AM.

    2014 HSV VF GTS
    2017 HSV GTSR
    http://www.facebook.com/ForcedInductionInterchillers
    Australia's Fastest 6.2L 1900 LSA VF GTS with a Stock Bottom End
    9.700 @143.14mph 17/July/2017
    V-Box Results 0-100km/h in 2.47sec

  8. #8
    Join Date
    Jan 2004
    Location
    Perth, WA
    Posts
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    Excess air that the engine doesn't consume is then pushed back out the bypass valve and recycled over and over and over again. In doing so this cooled recycled air is constantly cooling the blower rotors which are attached to the bearings. Hence "to some degree" the bearings will be cooler than without a chiller.
    Go and log the map sensor at idle, part throttle etc. You will see a vacuum.
    If it was behaving the way you are describing, it would have at least a small amount of boost but more likely compounding boost as it is circulating around and around, with some air flow constantly left over getting compressed further. This would have sky high stock IAT's!
    You would also likely see a large spike in boost when the throttle initially opens and the valve closes like you are saying.

    If the valve was open, it would be bypassing the intercooler so there would be no cooling at idle, low throttle etc.

    The engine can't pick and choose when to take boost and when to leave it in the manifold. The way you're describing it, it would constantly be making boost. The butterfly opening, allowing air in to the supercharger will dictate when it's making boost.

  9. #9
    Join Date
    Feb 2014
    Posts
    5,130
    I feel like we are going round and round in circles here.
    Either youíre not understanding what Iím saying or youíre not understanding how it works.

    Maybe call any competent tuner or simply stand next to an LSA engine and physically watch the valve when it is open and when it is closed.

    Everything I have said is true and factual, if your understanding is different Iím sorry but you are wrong.

    To clarify one last time, the bypass valve is open under the following conditions:
    Idle
    Part throttle cruise

    The bypass valve is closed when you desire to create boost pressure.

    You have 2 rotors in the blower consider these rotors fans, they suck air into the blower, when the bypass valve is open boost is not generated, when closed boost is generated.

    If you have an opinion different to this then so be it any competent tuner will disagree as they all know and see how it operates, it also makes sense on how it operates as described.

    2014 HSV VF GTS
    2017 HSV GTSR
    http://www.facebook.com/ForcedInductionInterchillers
    Australia's Fastest 6.2L 1900 LSA VF GTS with a Stock Bottom End
    9.700 @143.14mph 17/July/2017
    V-Box Results 0-100km/h in 2.47sec

  10. #10
    Join Date
    Feb 2014
    Posts
    5,130
    Have a read here if Iím not believed

    https://www.camaro5.com/forums/showthread.php?t=235461

    Post #3 onwards
    Thereís even a video you can watch of the valve being opened and closed.
    Last edited by GenF-GTS; 3 Weeks Ago at 06:55 PM.

    2014 HSV VF GTS
    2017 HSV GTSR
    http://www.facebook.com/ForcedInductionInterchillers
    Australia's Fastest 6.2L 1900 LSA VF GTS with a Stock Bottom End
    9.700 @143.14mph 17/July/2017
    V-Box Results 0-100km/h in 2.47sec







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