Aston177

You're really lucky you car doesn't go over 195F in 95F weather. My car's temp keeps climbing to 220F+ when idling with the AC on in traffic. If I turn off the AC, temps drop. If I start moving, temps drop. Did you replace your radiator? Is it OEM? New or used? Since my car is only overheating at idle, I'm thinking it's fan related. When I'm idling, the AC isn't as cool as it is when moving. Your car has 80,000 or so miles right? Mine has 32,000. How come my fans are failing and yours isn't? Bad quality control? Maybe the previous owner replaced your fans? I'm beginning to suspect you didn't have a cooling issue to begin with bro :P But it's good that you did everything. Your car is extra cool now

It's easy to tell if there's an exhaust leak. It makes a "tick" sound from where it leaks. I had an exhaust leak after gutting my cat. The guy didn't tighten the nuts properly, so car used to make a ticking sound whenever I start the car. When it warms up, the exhaust would expand and tighten up, and the ticking sound stops. You need to check it when it's cold. Make sure to tighten the nuts when the exhaust is COLD, not hot. As it's expanded when hot. When hot, the nuts will be tight.

I don't know why you hear a thump sound because I drive an Auto :P I know I know. It sucks.

Keep us updated bro

RX8 pearl red

Sorry, My car mileage is 55k Miles and 87k Kilometers

Yeah Auto is something that is not a racing car advantage.

Anyways, My fans and radiator is stock, Never changed. when at idle with AC on, i check the temps with OBD2 Scanner, when temp hits 190F, My both fans start at full speed. While the stock setting is that fans run at low speed at 208F then run in fast mode after 217F.

So basically what i did is that i don't allow my car to even reach 195F even at idle and in traffic by blowing them in full speed mode at 190F. ( Thanks to cooling fan kit).

One more thing to add, You mentioned that even if the fans are running at full speed, i will eventually see higher temps when stuck in traffic or driven hard. But strange thing is when i monitor temps, My Stock radiator seems to shed heat very very quickly. At all times when car temp reaches at 190F and fan at full mode turn on in traffic, it drops to 177F within 2 to 4 minutes. So thats why i never see 195F . Also i programmed the fans to also run on full speed mode when AC is on, and we tested the car at idle for about 2 hours with AC on and the same thing happened that the radiator shed heat very quickly and temps drops to 180ish range within 4 minutes. Now i can enjoy AC while having a snack and without worrying about car overheating.

My AC is cool when idling also which i believe is that it is something to do with me never seeing 195F.

Your fans aren't failing, they are just running low on high temps, make them move at full speed at stock specs if you don't wanna use cooling kit and that will take care of the temperature climbing at idle or traffic. I know it can be done because me electrician did this experiment before putting in the cooling kit. When your fans start to turn on at 206F ( rx8 original setting) at full speed then radiator will shed heat a lot quicker. I hope all this info can help.


Now coming to exhaust, there is not tick sound when cold, only the clutch tick sound which disappears when i press the clutch. we checked everything and there is no exhaust leak but Rear O2 looked like a damage piece. Will update after replacing the sensor.

As far as Donk/Thump noise when putting it in to first gear is concerned, that sound disappears when i double clutch for the first gear or depress the clutch for few seconds and then put it in first gear. All gear shiftings are smooth and easy

RX8 pearl red

BTW Aston177, how's your mileage after gutting your cat? and did the check light came after that? if yes then how did you mask it?

RX8 pearl red

UPDATE : The donk/thump sound comes from back from every gear when i put it from Neutral. Has my Differential shaft cross gone bad or is it normal?

BigCajun

iTrader: (1)

That does sound like a possibly bad u-joint.
I've also heard of backlash in the differential causing it.
If you can get under it, try putting it in neutral & moving it back & forth to try & pinpoint it.

RX8 pearl red

Yeah , did that, the sound was coming inside the differential shaft but i don't know which part is causing it. Do you have the same experience? or anyone else?

If its the U-Joint, it should also create problems on turns and curves but i have no problem with that, Also no problem shifting in speeds. Also there is no clunking sound during gear shifts. All i get is this thug Bass sound from the back

Any ideas from Gurus like 04 green or RIWWP?

Aston177

My fans spin on high speed. I hear them go into high speed. They're just not spinning fast enough to cool the car with the AC on. AC off, the cars temps are fine. And when i'm idling, the AC isn't cool enough. That's another reason to check the fans. I'll get it checked and post up a thread about it thanks for your help

My car had a bad cat when I got it, so the CEL was on even before gutting it. It wasn't completely clogged. But it had a P2270. It showed up after gutting the cat as well. Didn't do anything to mask it. At times I clear it with Torque. But it comes back after a few days. I've got used to living with it lol.

Aston177

Forgot. Milage is very crappy as I'm mostly stuck in town doing 15-30kmph. Most of the time I'm idling. So it's around 4km per liter.

04Green

iTrader: (1)

@ Aston...

If you are seeing temps that high there are some options. Have you sealed the openings around the radiator? The biggest issue I see is hot air from the engine compartment getting back in front of the radiator. If you think 95 degree air will not cool, try 195 degree air. I believe this is one of the things that PerlRed did as well. The fans coming on earlier helps too, but you are correct a few posts up that the fans are on high with the AC on.

The process is my sig under Congrats.

RX8 pearl red

Well, My mechanic told me that the thump noise you are hearing when shifting on idle is that the clutch/pressure is not working right and its giving extra force to differential to make that sound. I want opinions before making any purchases. Also the clutch pedal is stiffer than before.

The most important thing was we lifted both the rear wheels and then put the car in first gear, the car made that thump sound but also both tires moved an inch forward by themselves while clutch was depressed. same thing happened while putting it from neutral to other gears. In reverse, the tires moved back an inch.So obviously when the tires are down, then there is no free space for tires to move an inch forward and backward by themselves and thus a thump from backside appears

Need help guys


One last thing, i changed the transmission fluid, and it drank 4 liters to fill. is that normal?

Aston177

Yes I have. You even replied on my thread :P I'ts all sealed up. But the temp still goes up while I'm idling. When I go over say 15mph it cools down. Even the AC isn't cool enough when idling, so it must be a fan issue. I'm gonna test the fans and see if they're drawing the same amount of Volts as mentioned in the factory service manual. If not, I'm gonna try oiling them and see how that goes. I'll keep you updated on my thread.

04Green

iTrader: (1)

Thought that sounded familiar.

what I have not looked at is if the fans are only on when the compressor is on, or if they stay on the entire time the AC is on. have you noticed?

RX8 pearl red

My fans are ON when compressor is on, once it trips, Fans off BUT if at that time my temps are above 188F, Fans will continue to blow with full speed until it reaches 177F.

To be more clear, when i start my car in the morning and let the AC on, my fans start with full speed. But when AC trips my fans will stop. That cycle will keep on going upto when i reach 188F, After that its full speed fan on regardless of AC on or off until temps drops to 177F and at that time my fans are totally off

Aston177

Stock, the fans turn on when the refrigerant pressure switch is ON. They don't stay on the entire time the AC is on.

RX Pearl Red those are amazing temps. You've won the battle :P

How's the thump noise going?

RX8 pearl red

Thanks Bro, The thump noise is due to bad clutch Kit. The clutch is not freeing the transmission soon enough. When i press the clutch and wait 3 seconds then there is no thump sound.

My Mechanic told me to buy an new Clutch set. I have a 5 speed RX8, is the clutch plate same as 6 speed or do i have to order specifically for 5 speed?

04Green

iTrader: (1)

@ Aston...

Ah, I did not know that..

OK, recommendation, do the fans on low mod. That will run the fans all the time and keep air moving. It is an easy mod and might make a difference.

RX8 pearl red

Installed new clutch , flywheel and clutch beering. Now shifting is mega smooth. Another update will come when temps reach here 107f

RX8 pearl red

Kindly comment on this thread that i started new, kindly guide me if its normal or a serious problem

https://www.rx8club.com/new-member-f...1/#post4680031

RX8 pearl red

Well, Decided to gut the CAT today and went for it. Very strange thing is that the car exhaust sound didn't even changed a bit and there was no smoke from back. I am very surprised as we took the whole Exhaust out and gutted it properly and checked again and again and then fitted it BUT the exhaust sound is same as before the CAT was gutted. Any ideas?

EpikYummeh

It's not any louder? Removing it shouldn't change the note so much as the volume. When I put mine back in it just got quieter.

Aston177

When I gutted my cat, the first time I put it back on there was a lot of light blue smoke. I think it was because I washed the inside of the cat with water. However, I didn't notice a change in sound

RX8 pearl red

Thanks Aston, seems like no sound change after gutting the cat is normal. But the car feel fast to me now. Any ideas on how to make the sound a little bit louder just for fun?

EpikYummeh

If you want it to be louder, you're going to need to either a) get a new midpipe or b) get new cat-back exhaust pipes. You have lots of choices, and there are lots of videos on YouTube so you can at least get an idea of how it will sound.

RX8 pearl red

Well, i gutted the cat, cleaned maf and ess, Did break thomping procedure, Installed new Ignition, Did battery check, used premium fuel. After doing all that , i got the P0301 code 2 times in one week when i rev high.
Any other thing im missing?

Is it possible that the new OEM coils just can not handle the load on high rpms?

The car is not idling rough, but sometimes tail pipes do " Pough" a little. Car starts instantly on cold and hot. Smooth and powerfull acceleration. Any ideas guys?

Legot

iTrader: (1)

Consider your fuel system failing somewhere like the pump or injectors.

After replacing my ignition I was getting misfires and it turned out to be a failing fuel pump.