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My car has been running about 108c as a normal running temp lately. It has gotten as high as 117 when parked, although it cools down quickly to 108c when the car is driven even just a little bit. I first flushed my radiator and refilled with 50 / 50. That didn't help so I drained some and added distilled and Water Wetter which still didn't help. Changed T stat about 30 minutes ago and highest temp I got was 97c. I live in Texas but 108c seems a little hot for driving around even when I'm not boosting. The 97c I saw was when I was boosting but it was 12:30 AM.
I am not running an undertray, only things I can think of is not enough air is going through the rad (temps acctually get worse at high speed, 80-90mph). I thought maybe there is a leak but whenever I take off the filler cap coolant is visable in the neck.
I have the same problem dude, ive just learnt to live with it.
My plan to bring temps down is to install and FC/Miata thermoswitch, remove the weather stripping on the top of the firewall, and make up a custom type scoop thingy to force air through the rad as i have no undertray either.
Runnn without an Undertray will make the Temps higher..Due to No Good air flow .I noticed that between My first and Second N/A..my opinion would be to get one.or make one and Be assured that The air gets directed properly for Cooling The engine.rotaries need that cooling.YOu know what happens when they get TOO hot..Ka-CHING!(rebuild)
Well, you're going to get the same response from probably the same people who have had the same advice before.
You MUST run an undertray to get airflow through the radiator at highway speeds. Airflow through the radiator relies on pressure differential between the front of the radiator and the rear. No undertray causes the engine compartment to be pressurized at speed reducing flow. Once you have an undertray, then seal off the radiator well to force as much air as possible throught it.
Do not remove the weatherstripping at the firewall. It allows higher pressure air that is at the base of the windshield into the engine compartment making airflow worse.
Force your fans to come on earlier by having the interior fan at position 3 or 4, run with your parking lights on, turn you AC on. Each of these will make the fans come on at 94degC rather than 100degC.
Dual oil coolers will help to keep water temps under control also.
Did you put a Mazda thermostat in the car, or a parts store themostat? If it's a parts store, get a Mazda one in there quick. Are your fans running? The fans should kick on by 107c with the stock thermoswitch.
You need to get this under control or you'll slowly cook that motor to death.
Dale
__________________ | Dale Clark - RX-7 Bad-Ass
| '94 RX-7 R2 Brillant Black - Building the Perfect FD
| Go faster with stripes!
__________________
1994 Mazda RX-7 - 13B-REW with all the bolt ons plus more
1992 Lexus SC300 - 2JZ-GTE and Getrag 6 speed swap
2008 Lexus ISF - Sikky headers, ISS Forged Exhaust, Joez Intake
1. Lupercal, have you even checked to see if your fans are coming on?
2. If you still have the stock ecu, the fans don't turn on until 105C. If you are driving in hot weather and are running the a/c, I could see hitting 108C MAYBE.
Something is very likely wrong with the system besides the undertray issue.
1. Lupercal, have you even checked to see if your fans are coming on?
2. If you still have the stock ecu, the fans don't turn on until 105C. If you are driving in hot weather and are running the a/c, I could see hitting 108C MAYBE.
Something is very likely wrong with the system besides the undertray issue.
Fans are coming on. The car is still getting hot with the new t stat but not nearly as bad. I see temps as high as 103 after real spirited driving but it quickly cools down to about 98 when not boosting.
I have a power fc, although I'm not real inclined to mess with it. I'd rather leave it to Steve. And I never run my A/c it's shot.
I'm going to mock up an undertray when I get a chance, I work 2 jobs and got a ton of **** going on lately. Hopefully undertray can help cool car down.
It's funny because everybody states that you need an undertray. My vote is that you need an undertray so force air through the engine and to keep rocks and crap out; however, I have been without mine for awhile and never see temps above 95 (unless at the track). I could be weird, but it hold temp at about 86-90 with regular driving (and boosting). I have an undertray, I just need to get off my lazy *** and put it on. Along with the 99 spec lip.
Why on earth would you fab up a tray when the stock one works great and is inexpensive???
The PFC default turns the fans on at 99C. If you really beat on it in hot weather, you could expect it to go above that a little bit.
Because the stock one wasn't on the car when I bought it and I live in Texas and need something too cool my car off now, not later. 117c on the freeway isn't working.
I don't waste my time for nothing...
Also my clutch just burned up and I'm not real inclined to spend money on something I can make, I can't make a clutch so I'll go with an undertray.
My car didn't have one either.
I made one out of a cheap black plastic trash can from Walmart and it worked great.
I don't think you need an undertray; my vote is that you have a cooling problem. I ran without my undertray for 3 years and only had cooling problems on 100F+ days on the freeway. Autocrossed in 90F+ without hitting more than 95C on the PFC and all this on the stock radiator.
I only made my own undertray after having problems staying cool on long, highspeed trips. That is where you are going to get the full benefits of the undertray. If you are getting that hot just sitting - when the undertray is doing nothing - then you have other problems. If you have the stock rad., how many miles are on it? Are both fans working? Have you gotten all the air out of the system?
Believe me, I know the before and after effects of the undertray and it helps, but you are not going to solve all your problems with just putting one on.
My car didn't have one either.
I made one out of a cheap black plastic trash can from Walmart and it worked great.
I don't think you need an undertray; my vote is that you have a cooling problem. I ran without my undertray for 3 years and only had cooling problems on 100F+ days on the freeway. Autocrossed in 90F+ without hitting more than 95C on the PFC and all this on the stock radiator.
I only made my own undertray after having problems staying cool on long, highspeed trips. That is where you are going to get the full benefits of the undertray. If you are getting that hot just sitting - when the undertray is doing nothing - then you have other problems. If you have the stock rad., how many miles are on it? Are both fans working? Have you gotten all the air out of the system?
Believe me, I know the before and after effects of the undertray and it helps, but you are not going to solve all your problems with just putting one on.
I know the air is out of the system, I do want the double check the fans though.
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