Thanks swoope. I thought it was that hose... but wasn't sure... hehe didn't want to cut the wrong hose and so on :spank:

whats the cost before shipping from Mazsport, ~$210? I think thats worth 20 degrees F for the stupid kind of driving I do. Can anyone suggest a hi-capacity radiator for the rx8, if there is one. And what is the best heavy duty cat people are using?

it's $150, and about $10 shipping.

Its probably worth it just for autocross. Sitting in the paddock and such...

Does this help with AC temps in hot climates? I live in AL where it gets hot and humid. When I'm in stop & go traffic the AC struggles to blow cool air. With summer around the corner I'd buy this mod if it helps.

Kind of a little off topic, but I've been having some intermittent idle roughness ever since installing my cooling mod. The car had a rough idle when I first purchased (w/o the Mazsport mod) but I had pretty much resolved that issue with a nice grounding kit and the DIY crank case breather mod. Now, when the Mazsport device kicks the fans full on at idle my rpms drop to the first line below the 1,000 mark and the cabin vibrates substantially more (with the sun roof open I even get an annoying rattle occasionally). Anyone else had this occur? Could a faulty engine mount be causing the extra vibration when the extra load from the fans goes through the system?

Yes - I installed mine late last summer and it did make my AC significantly cooler - especially when idling and in stop and go traffic

The more idling and city driving (stop and go) you do, the better this mod is as it helps keep engine (and engine bay) temps down when you do not have any (or much) naturally forced airflow through the radiator.

When you are at cruising/highway speeds, the natural airflow pretty much keeps the temps down with little need for the fans - unless of course you are running the car hard and/or are in very hot weather - then it helps provide additional cooling under those circumstances as well.

Yes. The idle goes to crap whenever the fans kick on.

I thought it was just me, but I've spoken with about 3 others who have similar problems.

Car runs fine when moving, but at idle, the rpms and batt voltage drop to the point where sometimes the car can stall.

I recently installed a brand new red top with 750 CCA. It didn't help. I also added in a new breather to the intake manifold so it gets more air at idle (one way check valve so I don't lose boost), it didn't help much, if any.

Scott spent a while trying to tune it out (int-x), but that didn't fix it either.

What I was able to do was install one of the stock fuses, so that only one fan operated by the cooling mod... this completely stopped the idle issues, but it also doesn't cool nearly as well. Temps were allowed to reach 200 degrees again. Still better than stock, but 2 fans are better than one.

At this point I'm out of ideas on how to fix it. Is the alternator able to keep up with the loan of two fans at near max rpm at idle?

My Intake (added K&N filter) and Engine Management are stock and I only notice a very slight bump in the idle RPM when the fans come on (both at same time) - not rough or approaching stalling or anything like that.

Your and others idle issues could have something to do with the int-x (or other engine mgmt solutions) not compensating for the extra alternator load when the fans come on. The stock ECU will adjust the fuel to maintain proper idle when extra loads are added such as more alternator load or Air Conditioning.

I wonder how many out there with idle issues are using another engine management system and if this possible lack of load compensation could be what is causing the sensitivity to the electrical surge from the fan startup. If so, adjusting the idle up a little could help reduce this sensitivity (if the int-x will let you do this)

Jax your in Fredericksburg? I'm stafford born and raised. But don't let that fool you, I know my Rotaries, haha.

Anyway, June-September can get pretty hot in DC, esp. on daily drives to work. :/ So, I think this cooling mod is a must.

Same here - hardly notice it at all .
I also have the AP underdrive pulley which could help in this instance by reducing the pull on the alternator at idle .
My piggyback ems allows the stock idle characteristics to be maintained.

Cool - there are several on here in the Fredericksburg to Northern VA area.

Totally agree on the heat here in the summer - we truly have all 4 seasons here and it's like Florida or Texas in the summer months here.

yes, and make sure you reset your ac amplifier.

beers :beer:

How does one go about doing this reset? Is it essentially the soft reset with the pedal taps?

Doesn't RacingBeat's PCM Flash already offer better cooling? At that price point, it seems the RB Flash is a better deal, unless I'm missing something...
http://www.racingbeat.com/PCM.htm

RB reflash costs twice as much and gets erased anytime your dealer reflashes your car. It's not an ideal mod for some of us, especially those of us who aren't using the factory PCM to control fuel.

Also, what do you mean by "better" cooling? Either route will use the OEM radiator fans.

https://www.rx8club.com/showpost.php...54&postcount=8

beers :beer:

Ah, I see. I missed something. :)

"Better" than stock was what I meant. RB Flash seems to turn on the stock fans sequentially at a lower temp. than stock settings.

I don't understand why there are not pictures on this site or Mazsport's site. Seems like it would be easy to put up a bunch of pics with the steps.

Brettus, you have the mazsport cooler mod and AP pulley, so do you have any problems with your idle?

^ read:

https://www.rx8club.com/showpost.php...9&postcount=18
https://www.rx8club.com/showpost.php...4&postcount=20

mysql101,

I am having same problems. Any luck on the solution?

Regards.

yes, I did this, which has prevented my car from stalling:

http://rotaryinsider.com/rx8-92.html

I want to stress that I had no issues prior to the interceptor-x being used on my car, and that without the cooling mod the int-x works fine too. So it looks like a situation that only happens with the two together. Mazsport's website has a new item listed that controls the idle, so maybe if the idle is set to 1,000 rpm everything will function nicely.

Good news. I was hesitating on the fan mod due to the supposed idle issues, but since I'm on the stock ECU it looks like I'll be fine. I don't want to go with the Racing Beat flash as I'd like to maintain the ability of my car to take future flashes.

yeah, you'll be fine.