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Discussion Starter #1
I am not able to keep the 426 cool with the stock R/T radiator, in the summer with AC on in traffic it creeps up to 210-215*, 200 when cruising.
I have come across an 2010 SRT radiator that I can get, but it doesn't look that much beefier than the R/T model.
Comparing it to the radiator I have now, it's maybe 1" thicker across the top.
Has anyone upgraded the R/T radiator for an SRT model?
Was there a noticeable improvement in cooling?
The other option is an aftermarket model, but those start at $600...
any help is appreciated.

edit: this is for a 2010 Challenger R/T
 

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2015 RT 5.7 M6
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I am running the mishimoto all aluminum radiator and I remember seeing test results showing little improvement on the HC between stock and mish. Search funciton does not seem to be working for me now but I had a long thread about it...I bought mine for <$600...I think it was like $250 on sale. You might need to install some heat extractors like the SRT.
 

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210-215* is not crazy hot. I think you are fine.
 

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Boosted Stroked 2014 Shaker M6
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2015 RT 5.7 M6
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Remember this blast from the past?
 

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Discussion Starter #7
What do you the temps set for in the tune?
185 low, 185 med, 190 high

Remember this blast from the past?
whoops. my bad.

edit: looks like aftermarket it is...
 

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Discussion Starter #8
I am running the mishimoto all aluminum radiator and I remember seeing test results showing little improvement on the HC between stock and mish. Search funciton does not seem to be working for me now but I had a long thread about it...I bought mine for <$600...I think it was like $250 on sale. You might need to install some heat extractors like the SRT.
heat extractors?
 

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Discussion Starter #10
Yeah, the hc hood vents or just swap in a hood from an hc.
I can't due to that large hole I have in the middle of mine :)

Another member on a diff forum mentioned the fact that my R/T is only running 1 fan where the SRTs have two...maybe that is a possible fix for low speed overheating?
an aftermarket radiator
 

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Check out the link listed below:


- Alexis
 

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Discussion Starter #12
The coolant temps before the engine swap never exceeded 190, now it only gets that low when cruising. Maybe it's the 100* days we have here, or maybe the stock R/T radiator isn't up to the task.
I have not seen many performance replacement fan options so I'm guessing the SRT two fan setup must be well engineered.
thinking about this for a replacement
https://www.amazon.com/Dorman-620-039XD-Assembly-Brushless-Chrysler/dp/B07KFZ5NYZ/ref=pd_sbs_263_4/136-8727747-4651307?_encoding=UTF8&pd_rd_i=B07KFZ5NYZ&pd_rd_r=7562e009-de47-4a68-8116-fd2ed18e11ed&pd_rd_w=Jhf1z&pd_rd_wg=dh1DV&pf_rd_p=7cd8f929-4345-4bf2-a554-7d7588b3dd5f&pf_rd_r=XA0BFX8KP46BP0Q3QJHQ&psc=1&refRID=XA0BFX8KP46BP0Q3QJHQ
 

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2015 Challenger SRT
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Have you checked RON DAVIS for a radiator...
 

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Discussion Starter #14
sent an email to them requesting a quote. thanks.
 

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probably more fans - the SRT radiator has larger hose diameters - then you get into the water pump outlets are different sizes whether its a 5.7 or 6.1 / 6.4 engine.

FWIW, a 392 will range 203 - 212* I can tell when the fans come on because at 212 will quickly drop back down to with the fans and when the t-stat opens up. On a hot day it will stay ~ 208* at in town cruise speeds
 

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Discussion Starter #16
probably more fans - the SRT radiator has larger hose diameters - then you get into the water pump outlets are different sizes whether its a 5.7 or 6.1 / 6.4 engine.

FWIW, a 392 will range 203 - 212* I can tell when the fans come on because at 212 will quickly drop back down to with the fans and when the t-stat opens up. On a hot day it will stay ~ 208* at in town cruise speeds
Running the setup I have that warm would probably cause pre-detonation/knock problems.
I'm going to try the SRT dual fan setup...and possibly relocate the oil cooler.
 

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Discussion Starter #18
Im running a Koyo Brand radiator on my '09 426 stroker engine. I do have the SRT though, with the double fans and heat extractors. No heat issues on my end. The radiator was about $150 on ebay. Amazon.com: Go-Parts - for 2009 - 2010 Dodge Challenger Radiator (KOYO Brand) - (All submodels 5.7L V8 + 6.1L V8 + 3.5L V6) 68050131AA CH3010358 Replacement: Automotive
Thanks.
I am wondering how they list the radiator for all models (SE/RT/SRT) as there is a difference in radiator hose inlet sizes.
The shop I use has a 2010 SRT-8 radiator that I may try if the fans don't work out, I'd need to have it pressure tested tho.
 

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have you looked into Mishimoto or Fluidyne radiators?

those companies make direct fit performance replacements as well as made-to-order options.

I didn't realize Fluidyne is HQ'd not very far away from my town. Then again NC has a lot of aftermarket performance companies. Kooks is another one off the top of my head...
 

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Even mishimoto does not seem to perform any better than a stock radiator. The real benefit seems to be the all aluminum construction.
990273


 
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