FL5 Overheated on Track

[optronix]

I think the turbo is a huge contributor. Larger turbo and a less restrictive exhaust would likely completely eliminate the issue.

I don't know, I didn't watch the full aftermath and it appears he's back up and running more track sessions, but wasn't the bigger turbo what led to Gridzilla's recent issues?

I'm aware that overheating CAN happen, but my understanding is that it's a rare occurrence that was supposed to be resolved with the FL5. To date, I personally still haven't seen profound evidence of overheating issues in a stock FL5 or DE5 that wasn't due to some sort of extenuating circumstance, but I admit my sample size is limited as I don't live on this forum. My personal experience was two 20 minute sessions on a 80 degree day and it held up fine.

The DE5 I've seen zero evidence of overheating issues, but a fuel starvation issue has been identified.

I guess what I'm asking is has anyone experienced similar issues on track in a completely stock (engine) FL5?

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[keller]

It will happen even on a stock car sadly. It produces too much heat.

I believe it's mostly because of the headifold design. It absorbs just too much heat from the exhaust gases.

Honda always underestimated the rejected heat of this engine. A similar powered german car would have at least an auxiliary radiator, maybe an oil cooler and a separate transmission cooler.

 

[Jester04]

I believe it's mostly because of the headifold design. It absorbs just too much heat from the exhaust gases.

Honda always underestimated the rejected heat of this engine. A similar powered german car would have at least an auxiliary radiador, maybe an oil cooler and a separate transmission cooler.

Yes! They really undercooled this car. My M2 had a separate oil cooler from the factory and heavy radiator mods and not too far of a price point but it was a couple of years less of inflation.

 

[PointByPatrol]

I don't know, I didn't watch the full aftermath and it appears he's back up and running more track sessions, but wasn't the bigger turbo what led to Gridzilla's recent issues?

I'm aware that overheating CAN happen, but my understanding is that it's a rare occurrence that was supposed to be resolved with the FL5. To date, I personally still haven't seen profound evidence of overheating issues in a stock FL5 or DE5 that wasn't due to some sort of extenuating circumstance, but I admit my sample size is limited as I don't live on this forum. My personal experience was two 20 minute sessions on a 80 degree day and it held up fine.

The DE5 I've seen zero evidence of overheating issues, but a fuel starvation issue has been identified.

I guess what I'm asking is has anyone experienced similar issues on track in a completely stock (engine) FL5?

My FL5 is on the stock engine and tune.

 

[Clark_Kent]

Yes! They really undercooled this car. My M2 had a separate oil cooler from the factory and heavy radiator mods and not too far of a price point but it was a couple of years less of inflation.

And that's the thing. What other stock car in this price point will NOT overheat on the track under similar conditions? I'm inclined to say none. With all due respect to my FL5 brethren, but expectations are not aligned with reality.

The M cars are different. I had an F80 M3 on track in 95 degree ambient temps and overheating was an afterthought. That car also stickered in the mid-$60ks as a stripper pre-inflation.

 

[PointByPatrol]

I don't know, I didn't watch the full aftermath and it appears he's back up and running more track sessions, but wasn't the bigger turbo what led to Gridzilla's recent issues?

I'm aware that overheating CAN happen, but my understanding is that it's a rare occurrence that was supposed to be resolved with the FL5. To date, I personally still haven't seen profound evidence of overheating issues in a stock FL5 or DE5 that wasn't due to some sort of extenuating circumstance, but I admit my sample size is limited as I don't live on this forum. My personal experience was two 20 minute sessions on a 80 degree day and it held up fine.

The DE5 I've seen zero evidence of overheating issues, but a fuel starvation issue has been identified.

I guess what I'm asking is has anyone experienced similar issues on track in a completely stock (engine) FL5?

Gridzilla didn't purchase the metal blow off valve or something like that. His factory one failed, and he overboosted his turbo iirc. He'll be alright...that dude has drug money.

 

[keller]

I do know that the oil cooler face measured 126 fahrenheit after the session

Sorry, in your build thread you mentioned 126 degrees and my dumb head assumed it was Celsius. Can 126 F be correct? In normal operation, just idling, your car should see oil temps of at least 90 C/194 F. The thermostat on the sandwich plate would open, but the oil cooler wouldn't really cool down the oil because of lack of airflow. How could it be that low just after a hard track session? Any chance the thermostat is stuck closed?

 

[Jester04]

And that's the thing. What other stock car in this price point will NOT overheat on the track under similar conditions? I'm inclined to say none. With all due respect to my FL5 brethren, but expectations are not aligned with reality.

The M cars are different. I had an F80 M3 on track in 95 degree ambient temps and overheating was an afterthought. That car also stickered in the mid-$60ks as a stripper pre-inflation.

Yeah inflation is terrible . Even C7 zo6 corvettes where overheating at the track with a bunch of auxiliary cooling.

 

[Cornercarver]

Thank you for sharing. Looks like you were having fun while setting a good example for others on track etiquette and car control.
If your FL5 is overheating, then my FK8 has no chance of completing a long track session without pulling timing. To be fair, it has never failed on the road during spirited driving, even on longer drives, even in the triple digit temps we get at least 1/3 of the time. But it definitely is happier when the temps drop. The SI actually pulled timing more often.
Just did a kart race, no issues with overheating during a 15-20 minute race. Oh wait, those were electric, never mind. Never been a fan of EV's, but might make an exception for some kart tracks.
Horses for courses.

 

[PointByPatrol]

Sorry, in your build thread you mentioned 126 degrees and my dumb head assumed it was Celsius. Can 126 F be correct? In normal operation, just idling, your car should see oil temps of at least 90 C/194 F. The thermostat on the sandwich plate would open, but the oil cooler wouldn't really cool down the oil because of lack of airflow. How could it be that low just after a hard track session? Any chance the thermostat is stuck closed?

Worth investigating!

 

[optronix]

My FL5 is on the stock engine and tune.

Aftermarket intercooler thought right? Not stock IMO.

 

[Rhorn]

I think the turbo is a huge contributor. Larger turbo and a less restrictive exhaust would likely completely eliminate the issue.

Are the MHII and RV6 bigger turbos? Or is it the Garret one?

Also when you say less restrictive exhaust are you talking about the typical catback exhuast setups or the crazy one like the Amuse R1?

 

[Rhorn]

I don't know, I didn't watch the full aftermath and it appears he's back up and running more track sessions, but wasn't the bigger turbo what led to Gridzilla's recent issues?

Gridzilla said that he didn't use the typical AN lines when installing the turbo that you are supposed to use, he had a few parts on order and didn't feel like waiting lol.

EDIT: I was wrong. Its because he didn't use the bypass valve thats recommended for the turbo. He used the OEM one which failed

 

[PointByPatrol]

Are the MHII and RV6 bigger turbos? Or is it the Garret one?

Also when you say less restrictive exhaust are you talking about the typical cat back exhaust setups or the crazy one like the Amuse R1?

Amuse R1 is incredibly overpriced. They should have built an exhaust that fit their market at a reasonable price that matches the clientele that own the vehicle.

To answer your question, yes, both the MHI and RV6 are bigger turbos. Garrett is an excellent choice, and would likely be what I would choose from past positive experience with Garrett turbos.

The factory catalytic converter is restrictive, a larger downpipe catted or cat-less would suffice, and of course a cat back exhaust at at least a 3 inch diameter would be ideal. This aids in efficiently rejecting all of the combustion heat out of the tailpipe.

 

[Rhorn]

I believe it's mostly because of the headifold design. It absorbs just too much heat from the exhaust gases.

Honda always underestimated the rejected heat of this engine. A similar powered german car would have at least an auxiliary radiator, maybe an oil cooler and a separate transmission cooler.

Yeah thats spot on, the Golf R comes with an auxiliary radiator, and all that stuff. I wonder how the cooling is with those on track. Theres also the Elantra N. Not sure what Hyundai has done (if any) for cooling since I don't follow that car scene.

Its super lame that they refuse to add an auxiliary radiator

I was looking at the Camaro ZL1 1LE. Big supercharged engine with a V8, that thing has 12 heat exchangers lmao

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