(Possibly) Blew a head gasket looking for suggestions

[arlisscm]

What is the absolute maximum revs our unmodified, factory head and valve train can handle without floating/damage (given a built bottom end, like the SP63 in your engine bay)?

Not fully sure.

My old DHM tune back in the day revved to 7,500RPM, but I never tracked the car with that tune.

Had the limit set at 7,000RPM for the last few years and it hasn't been an issue on track (and apparently my factory engine is fine).

I can ask SP63, but when I floated the idea of 7,500RPM they didn't bring it up as an issue.

 

[arlisscm]

No real big updates at the moment. On the third and likely final iteration on my re-tune with Jason. Once again basically at the limit for 93 octane, only real difference to my previous tune is the rev limit is at 7,400RPM. I am working out the logistics of ethanol, considering the nearest station that has e85 is ~40 minutes away, I'm putting together a plan to store and mix it at home. Likely best solution is a climate controlled fuel shed, so I don't have a drum of e85 in my house (since my shop only exists in my mind currently).

Car feels and sounds good, nothing seems out of the ordinary. Getting packed up and loaded up this evening as I'm trailering down to Pocono Raceway tomorrow right after work, out on track Saturday and Sunday.

One small update is it looks like my new brake setup is going to ship out next week, so this is probably the last set of track days with my Wilwood setup up front.

 

[Grsemky]

No real big updates at the moment. On the third and likely final iteration on my re-tune with Jason. Once again basically at the limit for 93 octane, only real difference to my previous tune is the rev limit is at 7,400RPM.

Do you have any power numbers for the 93? There is no corn juice near me so if I go big turbo I'll probably stay to pump gas, though there is a few stations with 95 & 100 near me....

 

[arlisscm]

Do you have any power numbers for the 93? There is no corn juice near me so if I go big turbo I'll probably stay to pump gas, though there is a few stations with 95 & 100 near me....

Big grain of salt, but virtual dyno is generally around the 280WHP mark. I use the default frontal area and drag settings and a rough estimates for weight, and my tire diameter is different than stock. So, don't fully take the numbers at face value, because I just use virtual dyno to compare runs and make sure everything looks ok/happy. I'll drop in a snip of the three latest iterations. Note that I have and uprated HPFP and +30% injectors which helps keep the AFR rock solid at high RPM. I made roughly the same power before the fueling upgrades, but in the high RPM range AFR would lean out to ~12.2-12.3 which isn't super dangerous, but also not ideal.



As far as running high(er) octane fuel, I brought it up to Jason and he said there isn't a ton to be gained and ethanol is the best bang for you buck.

 

[Grsemky]

Big grain of salt, but virtual dyno is generally around the 280WHP mark.
As far as running high(er) octane fuel, I brought it up to Jason and he said there isn't a ton to be gained and ethanol is the best bang for you buck.

Trust me if I could find it I would use it, I think the closest station is like 60 miles😢 though there is a Torco dealer down the street from me, I also don't have the storage space for fuel😭😭😭

 

[Grsemky]

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Do you have any pulls in fourth? I usually do my logging with 4 gear as it's the closest to 1-1

 

[arlisscm]

Trust me if I could find it I would use it, I think the closest station is like 60 miles😢 though there is a Torco dealer down the street from me, I also don't have the storage space for fuel😭😭😭

About 40 miles for me, the irony being I live on farm land surrounded by corn fields that all go to make ethanol... It's a bit frustrating.

My plan is to just pay the premium for "the good stuff" and have 54-55 gallon drums of e85 delivered to my house and have a climate controlled storage/mixing shed for the fuel.

Do you have any pulls in fourth? I usually do my logging with 4 gear as it's the closest to 1-1

Haven't done a log in 4th as my usual data logging roads in... Mexico... aren't great for that type of speed (3rd is already pushing it). With my tire size and redline I max out ~125mph in 4th. I may be able to get one at some point.