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Drag guys, who drive occasionally on the street...

Posted by Okibonoe, Jun 24, 2019

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  1. Okibonoe

    Okibonoe Probationary Member

    20
    2
    Joined Dec 22, 2018
    San diego, California
    What is the smallest, lightest radiator you can get away with? We are talking about a E85, 40+psi, 750+ to the wheels combo. Thanks!
     
  2. b00stedtalon2

    b00stedtalon2 Proven Member

    623
    496
    Joined Dec 19, 2005
    Detroit, Michigan
    I have a tiny KLM radiator with a built in shroud and small SPAL fan. I drove the car for one hour in 80*F and didn't have any issues until I got stuck in bumper to bumper traffic for 25 minutes.

    47441601911_19dde3eb88_c.jpg
     

    1K  1

    1994 Mitsubishi Evo
    automatic · Lancer Evolution

    Street Build 3K  1

    1993 Eagle Talon TSi AWD
    9.585 @ 143.96 · 1G DSM
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    OH91awd likes this.
  3. Okibonoe

    Okibonoe Probationary Member

    20
    2
    Joined Dec 22, 2018
    San diego, California
    Thats nice! Thats exactly what im looking for.

     
  4. Archer Fabrications

    Archer Fabrications Supporting Vendor

    6,149
    893
    Joined May 9, 2011
    Scottsdale, Arizona
    I have an STM koyo core half rad for sale in the classifieds bolts in using oem mounting
     

    418  7

    2006 Evo 9 MR
    awd · manual · Lancer Evolution
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  5. Okibonoe

    Okibonoe Probationary Member

    20
    2
    Joined Dec 22, 2018
    San diego, California
    Cant find it, do you have a link?
     
  6. OH91awd

    OH91awd Proven Member

    575
    244
    Joined Sep 22, 2011
    chillicothe, Ohio
    another option would be a sirocco style radiator. thats what i run on my car.
     

    Attached Files:

    Drag Race Build 2K  17

    1992 Eagle Talon TSi AWD
    10.89 @ 125.67 · 1G DSM
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  7. motomattx

    motomattx Proven Member

    1,721
    527
    Joined Dec 9, 2010
    wampum, Pennsylvania
    I run the Sirocco radiator myself also, and even with it, the car will get well over the half way mark in sit still traffic where theres 25 min of sitting when its 90-100 degrees out, (I dont have much room for fans only small ones) I wouldnt want to run anything less.
     

    Drag Race Build 2K  16

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  8. OH91awd

    OH91awd Proven Member

    575
    244
    Joined Sep 22, 2011
    chillicothe, Ohio
    with mine it never got over 205* with a 180 tstat. and that was in town street driving middle of summer in ohio. i also have a derale fan that moves 1500cfm of air (it was the biggest i could find that fit between the compressor housing and the rad).
     

    Drag Race Build 2K  17

    1992 Eagle Talon TSi AWD
    10.89 @ 125.67 · 1G DSM
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  9. ThunderChild

    ThunderChild Supporting VIP

    2,541
    712
    Joined Jan 5, 2012
    Rathdrum, Idaho
    This is pure speculation from me, but I've always wondered if the rad isn't the main issue, and the water pump ports on the block are.

    Case in point, Mazda 1.6-1.8 blocks. I have had a couple and run some small size rads, namely Honda rads, and never had issues overheating or even getting remotely warm.
    The water pump impeller sits essentially inside the block with no shrouding, it's one ~3" hole that's directly in the water jackets. I've contemplated opening up the holes in a 4g block and swapping the impeller or at least using an anti-cavitation style impeller to improve the ease of flow without increasing pressure or drastically changing other aspects.

    The pump entry ports on the blocks are vastly different, but otherwise the engines coolant path is fairly similar, pics for reference.

    Mazda block, HUGE pump port opening and open to both sides of the cylinder walls.
    $_1.jpeg
    4g block we all know and love, I realize this ones filled but you can see the comparison or port sizes.
    $_57.jpeg
    Pics were just Google grabs, not my own and I take no credit for them.
     

    Street Build 198  3

    1990 Plymouth Laser N/T
    fwd · manual · 1G DSM

    287  8

    1987 Toyota Pickup/Hilux
    awd · manual · Misc Vehicles

    Street Build 838  7

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

    Street Build 1K  1

    1992 Eagle Talon TSi AWD
    manual · 1G DSM

    Street Build 2K  10

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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    turbotalon1g likes this.
  10. motomattx

    motomattx Proven Member

    1,721
    527
    Joined Dec 9, 2010
    wampum, Pennsylvania
    Your only going to flow what is limited by the inside diameter of the coolant hoses, that 3" hole wont flow a lot more than the Mitsubishi holes and it leaves a weak spot in the block.
     

    Drag Race Build 2K  16

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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    Archer Fabrications likes this.
  11. Okibonoe

    Okibonoe Probationary Member

    20
    2
    Joined Dec 22, 2018
    San diego, California
    Good stuff yall
     
  12. diambo4life

    diambo4life Proven Member

    1,014
    71
    Joined Apr 18, 2002
    Edmond, Oklahoma
    I think your issue here is your fan or fans. I run an AFCO in my Galant and even in standing traffic with 100 deg temperatures outside, it rarely goes over 200degF. I have a single beefy 11" SPAL fan on mine.
     

    Drag Race Build 570  1

    1990 Mitsubishi Eclipse GSX
    manual · 1G DSM

    Street Build 3K  24

    1991 Mitsubishi Galant VR-4
    710 whp · 501 lb/ft · Galant VR-4
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  13. motomattx

    motomattx Proven Member

    1,721
    527
    Joined Dec 9, 2010
    wampum, Pennsylvania
    Oh its likely my fans yes, I simply dont have room for any larger fan and the best I can do is run a pusher on the front of the radiator at that, and a tiny 6" or so puller on the engine side off of a Yamaha raptor.
     

    Drag Race Build 2K  16

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  14. jed344

    jed344 Proven Member

    555
    22
    Joined Jan 10, 2008
    Waterville, Iowa
    Full wet or 1/2 filled block? I can tell you my 1/2 filled block running on e85 stays very cool coolant temp wise. Oil temps can be a different story, I assume because now there is less cooling load on coolant and more on the oil.
     

    784  26

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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