Or take cool-down laps every second or third lap.

 

220 F on coolant on a 90 degree day is getting close to a serious cooldown lap for me. 220F on oil isn't. Around 230 on the oil I start watching REAL close but the only time i have actually seen that is when we were red flagged during the end of a session and i had to set there.
Ihave found that keeping the rpms down really helps---duhhhh?). I run a 17 inch tire so that really helps in doing that. my torque curve is pretty good with the supercharger so that will help also. My redline is at 8K(my preference) with some shifts between 7.5 and 8 depending. those rpms between 8k and 9.2 k really heat the engine.
I hope to have a data logger but it only measures the temps at the maf--- its the temps POST blower that i would like to watch.
olddragger

 

Are you running Paul's water pump and Ray's radiator? sorry if I missed that if you are...

 

the rx7 guys I track with try not to let their temps get above 205.

 

just don't be the person to put an FI rx8 off track ...

 

lmao.. that's just mean

 

I have the pump---not the radiator
Damn it team now you done gone and jinxed me.
No not really
Wonder how long the ice will last in my reservoir?
Coolant temps have never been a prob for me. that may have changed---if oil gets to 240 i back completely off and cool her down.
Now if intake charge temps get over 130---she is slowing down also!
OD

 

i have been tracking my 8 for almost 2 years now since i had the turbo. i don't recall any problem on overheating, neither water nor oil temp. they both max at around 220 to 225 on last year mazfest in hot summer when the ambient temp was 106 F. however, i did feel power loss at the 6th/7th laps during each section, and on my way home that day. i was running 100 octane most of the time on the track.

 

Thanks Sammy---i remember the 106 day at Road Atlanta when my alternator belt got so hot it started fraying some.
That reminds me to take extra sc belt with me.
Our session is approx 10-12 laps usually.
Doesnt race gas have lead in it or do they have unleaded type?
I dont have a cat but was wondering about the o2 sensors.
Sweet looking car ---i like the spitter and hood
OD

 

How much boost are you running?

 

10psi

 

they have both leaded and unleaded race gas. here in southern california, the highest octane unleaded race gas you can find on most tracks is 100, and anything higher than that is leaded.

my wideband o2 sensor is going bad now, and it has 12000 miles.

 

http://www.vpracingfuels.com/vp_01_fuels.html#unleaded (109 max)

http://www.sunocoinc.com/site/Consum...UnleadedFuels/ (104 max)

http://torcoracefuels.com/content/view/209/3/ (108)
http://torcoracefuels.com/content/view/207/3/ (104)

http://www.turboblue.com/product.asp (104 max)

 

thanks Team---one hint at the tracks is to get a jug for the fuel with a filter---some tracks have some sediment in their tanks--some have a lot.
OD

 

they should all be pumping through filters before it hits your can or tank ...

 

never hurts--hell they should pump it for ya at $7 a gallon.
OD

 

maybe you should update your username to newtracker

 

Come to think of it "other" username's HAVE been suggested by several. Some quite creative
OD

 

just came back from the buttonwillow track yesterday. ambient temp was 106, and the car was running at 8-9 psi. my stock water temp read 228F after 3-4 laps, while the defi water temp read 235F. the defi water temp sensor is mounted on the upper radiator hose. i have koyo, mazdaspeed radiator cap, vented hood, arc coolant, mazsport fan relay, relocated battery & removed intake tray/box, ur crank/water pump pulley with stock alternator pulley.

i was runing with quater tank of 91 mixed with 9 gallon of 100 octane & idemitsu premix in .5oz per gallon ratio.

it took about half a lap of crusing to cool it down to below 200F.

 

Do you think a larger front bumper inlet will help you? Like the Mazdaspeed bumper?

 

i forgot to mention that my whole front grill was drilled out, and the lower portion of the reinforcement bar was cut (about 1 inch in height), so my whole intercooler is getting air flow.

i am actuallly looking at doing a v-mount set up.

 

I am, unfortunately, convinced that the Koyo is the culprit.
I installed a Koyo as a countermeasure to overheating and, after two summers, I am convinced that my car is more likely to overheat with it than it did on the OE rad.
I'm going to swap to one of Ray's radiators fairly soon, but I might swap the OE back in the interim and see the difference.
I've already gone to bigger fans, water only (with WW for lubrication, surfactant), directed ducting, fans on at full by 190°F, etc and nothing keeps the temps below 230°F under heavy use.

Yeah, so am I. Plenty of room for it.

 

We have had trouble with the koyo's actually increasing temps. Most guys are running stock now.
I run the Mazmarts pump with stock pulleys(no cavatation issues now)
70/30 blend and defi rad coolant(actually works better for me that the redline w.w.) we actually could use a barrel type thermostat now if one was available.
took the bucktooth out of the front, no screens of course on coolant or oil coolers
and one fan on at 180. Took that hot *** heater hose that goes around the firewall and redirected under the car---helped the engine bay out a little.
The biggest factor I have found is to keep the car out of the 8k-9K range. That 1K of rpms equals to a lot of heat. I use tire size to gear to the track as best I can.
on a 106F day while still NA coolant temps never over 220(usually between 210 and 220F) and oil never over 225 and I ran hard.
Now synthetic oil does run cooler
now this s.c. has changed everything. Maybe I can keep the rpms down even more.
olddragger

 

My thought on the overheating:

When I was at WOT for 3-4 laps, air going through the intercooler was already hot before hitting the radiator, so the coolant/water did not get enough cooling from that air flow.

As I was slowing down in less than a lap, the water temp dropped quickly to under 200F. Therefore I think the koyo is efficient.

I might be wrong though. Just wounder what it would do to the water temp after doing a v-mount, as both intercooler and radiator will be getting separate air flow at all time.

 

Well, V mounts are much more efficient that what we have now, so I would expect to see a 20 degree drop in temps.