J2 flow mod

I have been researching killer chiller vs bigger h/e and came across this j2 deal on lethal performance. I did some research on it and haven’t really found anything. Does anybody have experience with this? I’d like some reviews/different options for cooking. Thanks in advance.


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Coryh0525 said:

I have been researching killer chiller vs bigger h/e and came across this j2 deal on lethal performance. I did some research on it and haven’t really found anything. Does anybody have experience with this? I’d like some reviews/different options for cooking. Thanks in advance.


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I have done research on it and I have not seen anyone prove that it improved temperatures over a massive trunk tank (5-10gal) and quality pumps. It's also a mod that about 1% of these cars need. Until the Lower intake and intercooler is redesigned depending on your needs a good trunk tank with no 90s and good pumps is the way to go.

So the longer lines to the trunk tank combined with an EMP/Stewart is what really dissipates heat better, directly resulting to lower iat2s

Edit: Does the volume matter? What if you just run more hose to the rear and back to to front again on a typical engine ic tank setup

I just did the J2Flowmod together with the Tig Vision 7gal trunk tank. I wouldn't do this until you already have a trunk tank or do it together with a trunk tank, otherwise gains would be nominal.

For example, before the tank, I had a 2 gal under hood tank, stock IC pump, upgraded heat exchanger, even when packed with ice, the whole 2 gal of ice would melt and be hot to the touch after doing a short 2 gear pull at WOT. If it were a flow problem it would have taken longer for the all that ice to melt. These cars need way more water capacity AND flow to be effective. Even with factory blower, the water capacity was too small evidenced by some guys blowing motors during longer 5th gear pull or doing back-to-back run without cooldown/re-ice

The lack of intercooler water capacity is a much bigger problem than the flow...of course having more of both is best.

BLOWN9646 said:

So the longer lines to the trunk tank combined with an EMP/Stewart is what really dissipates heat better, directly resulting to lower iat2s

Edit: Does the volume matter? What if you just run more hose to the rear and back to to front again on a typical engine ic tank setup

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Yes volume matters. It takes way longer to heat up 7 Gallons than it does sub 1 gallon. The benefit of a trunk tank like luckeski said is you can add mass amounts of ice to increase cooling you can add a big Rule 2000 pump to move the water and bigger lines to have more water flowing.

Yall have to remember the lower intake and intercooler were designed to flow sub 900 cfm and guys with these big ass blowers are putting near 2000cfm through them. That compressed air is spiking the temps. Until that intercooler is redesigned from the time we will just have to band-aid where we can.

So what is the best band aid for a street driven car then that may see track time and spirited driving on weekends?


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Coryh0525 said:

So what is the best band aid for a street driven car then that may see track time and spirited driving on weekends?


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What is your setup? Are you actually having heat issues? For 15+ years now guys with twin screws and TVS guys have done well with just an in engine compartment bigger than stock intercooler reservoir a nice triple pass heat exchanger and upgraded radiator for spirited driving. 99% of people this is fine for. The ones that track often or are pushing 26+ psi are the ones that really benefit from the trunk tanks and killer chiller.

Now if you just have money to burn and you have upgraded your heat exchanger and your reservoir I would go with a trunk tank for now. If still having heat issues than look at J2 mod.

I ran both of these kits on my last car (2.9 e85 cans 700rwhp car)

I lived in Florida and the heat was ridiculous.

I first had the killer chiller. Idle and cruising was awesome. Never saw above ambient temps, but when I would so back to back pulls the KC couldn't keep up. Not nearly enough fluid or time to get the fluid back down to a decent temp.

So I ended up doing the flow mod kit and tank with the massive pump. This did better in the summer for me but the fluid would eventually heat up and I'd still get high iat2s at the end of a pull.

I've since moved to beautiful Erie, Pa and I won't be battling the 100* weather all the time, so I elected to get the killer chiller for my new car It's cheap and I didn't want to have to run lines all the way to the trunk again. For the type of driving I do this will be good enough for me.

I'd say if you are a dedicated track person the trunk mount will serve you well. It's a great kit and throwing some ice in the tank you'll have great IAT2s with all that extra fluid and better flow.



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Maybe it’s for nothing or minimal gains but pairing it with a huge GT500 intercooler does look cool!

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i dont have any logs to back it up yet but it has to be better than the factory set up or even a modded 03 set up. i was getting some pretty high iat2s at the end of pulls with my 2.3 tvs making 21-22lbs. i had an afco dual pass and moroso underhood tank. i now have a vmp triple pass gt500 h/e (biggest one offered), stewart emp pump, j2 flow mod and a 7 gal trunk tank. still getting everything worked out with the car so i dont have logs but between the extra flow, extra fluid capacity and extra surface area of the h/e i cant see how it wouldnt lower temps.
and yes the gt500 h/e looks great in the factory opening!

SVT_Troy said:

Maybe it’s for nothing or minimal gains but pairing it with a huge GT500 intercooler does look cool!

View attachment 1572117Untitled


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How does it look with the bumper on?

lucheski said:

How does it look with the bumper on?

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Ehh not that good, I mean it just looks like a normal HE is there in my opinion. I plan on updating my build thread sooner or later.


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Did the larger gt500 h/e impact radiator efficiency?


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GodStang said:

What is your setup? Are you actually having heat issues? For 15+ years now guys with twin screws and TVS guys have done well with just an in engine compartment bigger than stock intercooler reservoir a nice triple pass heat exchanger and upgraded radiator for spirited driving. 99% of people this is fine for. The ones that track often or are pushing 26+ psi are the ones that really benefit from the trunk tanks and killer chiller.

Now if you just have money to burn and you have upgraded your heat exchanger and your reservoir I would go with a trunk tank for now. If still having heat issues than look at J2 mod.

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I’m not having any heat issues. I actually just picked up a comp orange car that is stock minus pulley, lowering springs and tune. I am just trying to do my build in the right order so I’m going cooling and suspension first. Just trying to work out what is best for a street car that will also be playing around sometimes. I may do a bigger h/e and the kc. Just have a valve for when I need the kc


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Dave.O said:

Did the larger gt500 h/e impact radiator efficiency?


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I haven’t finished putting the car back together yet. I have quit a few logs from previous setups to compare it with.

With that said I’m not the first to run this setup and I’ve never heard anyone else complain about negative effects from going with a GT500 intercooler.


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SVT_Troy said:

I haven’t finished putting the car back together yet. I have quit a few logs from previous setups to compare it with.

With that said I’m not the first to run this setup and I’ve never heard anyone else complain about negative effects from going with a GT500 intercooler.


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Ok, please update when completed.
I'm always researching this.
I open track mine in Houston and have nothing but heat issues.
Always looking for new ways to increase heat rejection capacity of intercooler set up to last more and 15 min in 100' temperatures.
Racebronco appears the best set up, but his is totally custom


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Dave.O said:

Ok, please update when completed.
I'm always researching this.
I open track mine in Houston and have nothing but heat issues.
Always looking for new ways to increase heat rejection capacity of intercooler set up to last more and 15 min in 100' temperatures.
Racebronco appears the best set up, but his is totally custom


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From what I read you need one of race bronco/true forged heat extraction hoods. Those with a normal functioning cooling system are said to drastically improve temps. Might want to see if you can Aquire one of them.


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^^^ this. i have one of the hoods and i can tell you the recovery time is greatly improved. i dont open track my car so i cant speak for continual use but it does improve air flow through the radiator and out of the engine bay

94slowbra1 said:

^^^ this. i have one of the hoods and i can tell you the recovery time is greatly improved. i dont open track my car so i cant speak for continual use but it does improve air flow through the radiator and out of the engine bay

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Got any IAT2 numbers?