Tuned Reliability?

Twisted Tuning

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Hi! I have been heavily digging into the whole Supra/B58 tuning scene and a thought came to my mind:

Has anybody blown up their Supra yet?

I personally haven't seen any reported cases from any tuner, any power level, mods, etc. So I guess I am mostly searching for anyone who has catastrophically damaged their motor or trans. Along with that questions, has anybody else had issues with their cars in terms of day to day reliability? Small things like PCV valves, spark plugs, coolant consumption, CELs?
There have been some B58 failures indeed (im speaking B58 as whole, not just Supra). The B58 is very strong, but not bulletproof. I had made a post the other day on a facebook group i think it was. About being weary of tunes that run the car super lean on ethanol to try extend the fuel system capacity. I've seen many do it, and its not good practice at all. But to each their own. I saw a log of a fairly recent B58 failure from another tuner, and the car was way too lean for the boost pressure ratio and timing was way too advanced. They were probably riding the knock sensors. But just because there aren't timing corrections doesn't mean the tune is safe. Melting pistons is a thing, and can happen pretty fast wwithout the knock sensors catching it.

For this engine in my experience that extends beyond the supra. 650tq is a happy place where with a sound tune the engine will thrive for some time. As you go beyond that with the stock internals longevity begins to decline. B58 is not prone to cylinder ovaling like prior open deck BMW turbo 6s at high torque. So being a closed deck design helps the B58 exponentially with power holding. you can stretch the power reasonably, but as with anything there is always a chance of failure if something gets out of sort.
 

ALEXVOSS123

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There have been some B58 failures indeed (im speaking B58 as whole, not just Supra). The B58 is very strong, but not bulletproof. I had made a post the other day on a facebook group i think it was. About being weary of tunes that run the car super lean on ethanol to try extend the fuel system capacity. I've seen many do it, and its not good practice at all. But to each their own. I saw a log of a fairly recent B58 failure from another tuner, and the car was way too lean for the boost pressure ratio and timing was way too advanced. They were probably riding the knock sensors. But just because there aren't timing corrections doesn't mean the tune is safe. Melting pistons is a thing, and can happen pretty fast wwithout the knock sensors catching it.

For this engine in my experience that extends beyond the supra. 650tq is a happy place where with a sound tune the engine will thrive for some time. As you go beyond that with the stock internals longevity begins to decline. B58 is not prone to cylinder ovaling like prior open deck BMW turbo 6s at high torque. So being a closed deck design helps the B58 exponentially with power holding. you can stretch the power reasonably, but as with anything there is always a chance of failure if something gets out of sort.
so in your opinion 430whp to 450whp is safe?
 

Marin@MarinTuned

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so in your opinion 430whp to 450whp is safe?
If it is tuned appropriate I would say it should be on the safe side. But I have seen people running near stoich AFR with crazy timing obviously not understanding the concept of cylinder temperatures.
 

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The car was meant for 25% so i am not too bothered running 50%. I have ran 50+% ethanol for about 8-10k miles so far and havent had issues. Most modern cars dont have issues with the lines, and the filters seem fine. But some of the early gen DI pumps did struggle with the higher ethanol. But usually 30-50% ethanol is fine on those platforms, as some of them need the extra lubricating properties.

I plan to permanently run my car on ethanol and it is daily driven so if something goes wrong everyone will hear about it. But so far things are looking pretty positive!
Yeah I make 700/700 wheel on my pure 800 with E54 (thats what was my pump typically has).

I was making around 525/645 or so on my stock turbo with e50 and meth.
That is some serious power for the new Supra, especially the torque numbers. Would you say 650 wheel torque is the safe limit for the transmission to handle? Or backing it down to 600 or less is optimum for longevity? Thanks.
Yeah I make 700/700 wheel on my pure 800 with E54 (thats what was my pump typically has).

I was making around 525/645 or so on my stock turbo with e50 and meth.
That is good information. Glad to know that you have been running E50 for 10k miles without any issues. Thanks a million.
 
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I've actually heart something interesting as of recently. Apparently the early non TU B58's have an issue with scoring the bores. It seems to be attributed to failed fuel injectors that are washing the oil film off the cylinders and it results in a bad misfire.
 

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so in your opinion 430whp to 450whp is safe?
with a sound tune? Absolutely.


I've actually heart something interesting as of recently. Apparently the early non TU B58's have an issue with scoring the bores. It seems to be attributed to failed fuel injectors that are washing the oil film off the cylinders and it results in a bad misfire.
im not in agreement with that at all. due to the logs i have seen of the B58s that have failed. But anything is possible.
 

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Are you making that power on the stock turbo? I had my car dyno tuned using ecutech with an Active Autowerke catted DP, Eventuri CAI, and FTP charge pipe on the stock turbo.

I am making 493 whp and 612 wtq running an E50 tune. So far no problems. Although, when in comfort mode the new tune has the car shifting to higher gears even at low speeds. Don't have that problem in Sports mode.

I also have a 93 pump gas map that makes low 400 whp. I want to upgrade the turbo to a pure 800 but don't want my torque numbers to go up because I am at the max that I want to be with the torque. I don't want to stress my transmission. I want the E50 power on regular 93 pump gas. Don't want to run the car too much on the E50 tune as there could be long term effects to the fuel lines and fuel pump etc. The car was meant to run no higher than E25 based on the owners manual.[/QUO
The car was meant for 25% so i am not too bothered running 50%. I have ran 50+% ethanol for about 8-10k miles so far and havent had issues. Most modern cars dont have issues with the lines, and the filters seem fine. But some of the early gen DI pumps did struggle with the higher ethanol. But usually 30-50% ethanol is fine on those platforms, as some of them need the extra lubricating properties.

I plan to permanently run my car on ethanol and it is daily driven so if something goes wrong everyone will hear about it. But so far things are looking pretty positive!
I ran my GT350 on E85 for four years and loved every minute of it.Zero problems.
 

Marin@MarinTuned

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That is some serious power for the new Supra, especially the torque numbers. Would you say 650 wheel torque is the safe limit for the transmission to handle? Or backing it down to 600 or less is optimum for longevity? Thanks.

That is good information. Glad to know that you have been running E50 for 10k miles without any issues. Thanks a million.
I dont want to be quoted for any exact numbers. I have seen 600WTQ to hold under constant pull (actual, not SAE), but during shifts I am still doing testing to see what we can squeeze out. I star to slip around 600WTQ ( again actual not SAE ) on heavy shifts but I have been makin tweaks and making improements. My car doesn't slip like crazy right now on it. So around 600-625 WTQ might be that okay spot if you wanna ride it. I plan to ride this out and play with it for a month before I swap the internals out.

But 600WTQ is actually pretty decent. That puts this on par with the GTR trans for power capability. With 2 extra gears. We stil have issues in 6th though. Around 550-600WTQ it will randomly lose the gear.
 

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I ran my GT350 on E85 for four years and loved every minute of it.Zero problems.
That is great to hear. What did your owners manual say the max ethanol content should be? Also, did you run E85 only without switching to pump gas?
 

Romel Roze

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I dont want to be quoted for any exact numbers. I have seen 600WTQ to hold under constant pull (actual, not SAE), but during shifts I am still doing testing to see what we can squeeze out. I star to slip around 600WTQ ( again actual not SAE ) on heavy shifts but I have been makin tweaks and making improements. My car doesn't slip like crazy right now on it. So around 600-625 WTQ might be that okay spot if you wanna ride it. I plan to ride this out and play with it for a month before I swap the internals out.

But 600WTQ is actually pretty decent. That puts this on par with the GTR trans for power capability. With 2 extra gears. We stil have issues in 6th though. Around 550-600WTQ it will randomly lose the gear.
I have 612 wheel torque now and haven't experienced any issues, but I am probably not pushing it hard like you. I think I'll have my tuner back off on the torque once Inget my pure 800 turbo. Maybe something around 580 if he can. I would be fine with 550 wheel HP and 550 wheel TQ.
 

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Cant wait till my Meth stealth tank setup is fabricated, you guys make me want to slap that Pure800 in and let her rip
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