[Joshboody]

Some tuned logs.

I am stock except for procede. these were taken at random. Some of these are aggressively tuned in my learning process. And some have a little heat soak, but for the most part very tame on timing. You don't see the aggressive ramp trying to get back to stock curve.

I'm in AZ at 700 to 1000ft above sea level which spins the turbos approximately an extra 0.7psi to reach boost shown in the graphs. 91 octane. a couple 91 / 100oct mix noted below.

[Clap135]

Josh were these taken with the bt tool again? If so the ignition numbers are not accurate but the curve shape is. Either way tune is still to hot even with the low octave race gas mix. Some looks look OK others simply look bad.

[Joshboody]

no this was procede logging tool, transfered to excel... i like to keep some saved as quick reference.

Some maybe hot, but for the most part i don't think so. I know you don't want to see knock anytime, but that's not possible in my opinion to run a fast, well tuned car. maybe if you can map different gears.

[Joshboody]

the 100oct run was just too much fun, so i'm sure i was a little heat soaked at times. I actually didn't log but only a couple runs, because it was so much fun to drive, I didn't want to spoil it.

[themyst]

Originally Posted by Joshboody

no this was procede logging tool, transfered to excel... i like to keep some saved as quick reference.

Some maybe hot, but for the most part i don't think so. I know you don't want to see knock anytime, but that's not possible in my opinion to run a fast, well tuned car. maybe if you can map different gears.

What a great idea!

[vasillalov]

It looks like you've been logging for over a year! Impressive. Has the ECU been updated since you started logging?

[Jeff@TopGearSolutions]

ITs def obvious which logs are race gas, thats for sure.

[Dackz]

Josh, you claim .7psi increase at only 1000ft elevation....how accurate is your statement? I ask this because then at 5000ft where I live, Im hitting 4.5 extra psi to reach targets meaning that even stock, 8psi is like pushing 12.5psi on the turbo's. Just wondering where you got that figure from as the extra spin and strain on the turbo is something that bothers me and keeps me from going tuned.

[Clap135]

You should post these in the big thread. You upper the boost and the curve due to proper control looks better than stock.

[fisherbln]

Originally Posted by Dackz

Josh, you claim .7psi increase at only 1000ft elevation....how accurate is your statement? I ask this because then at 5000ft where I live, Im hitting 4.5 extra psi to reach targets meaning that even stock, 8psi is like pushing 12.5psi on the turbo's. Just wondering where you got that figure from as the extra spin and strain on the turbo is something that bothers me and keeps me from going tuned.

Even if the 0.7 psi is correct and it is applied linearly in direct relation with elevation, that only works out to 3.5psi at 5k feet (0.7*5=3.5). Despite the minor math error, I am very curious about what you're asking as well since I am considering moving to a high altitude city.

[Dackz]

Originally Posted by fisherbln

Even if the 0.7 psi is correct and it is applied linearly in direct relation with elevation, that only works out to 3.5psi at 5k feet (0.7*5=3.5). Despite the minor math error, I am very curious about what you're asking as well since I am considering moving to a high altitude city.

Sorry, my math sucks most of the time But yea, its concerning because I know alot of guys have started to have turbo whine here tuned, and I even had my turbo's replaced due to whine stock last year. It would be nice to know what the correlation is. All the tuning companies say 'oh your fine' but really, we arent. I know boost #'s that the gauges hit ISNT what the turbo is spinning, so I hope OP can elaborate on this.

[Joshboody]

Originally Posted by Dackz

Josh, you claim .7psi increase at only 1000ft elevation....how accurate is your statement? I ask this because then at 5000ft where I live, Im hitting 4.5 extra psi to reach targets meaning that even stock, 8psi is like pushing 12.5psi on the turbo's. Just wondering where you got that figure from as the extra spin and strain on the turbo is something that bothers me and keeps me from going tuned.

it's from the log... i'm at 14psi absolute during idle. piggy is advantageous in my opinion at high altitude because you can cap your max boost.

take your absolute boost reading and subtract baro and that's what your turbos are pushing.

[themyst]

Originally Posted by Dackz

Sorry, my math sucks most of the time But yea, its concerning because I know alot of guys have started to have turbo whine here tuned, and I even had my turbo's replaced due to whine stock last year. It would be nice to know what the correlation is. All the tuning companies say 'oh your fine' but really, we arent. I know boost #'s that the gauges hit ISNT what the turbo is spinning, so I hope OP can elaborate on this.

I'm sorry but every tuned n54 I know has that whine, especially when cold.

[Jeff@TopGearSolutions]

Originally Posted by Dackz

Sorry, my math sucks most of the time But yea, its concerning because I know alot of guys have started to have turbo whine here tuned, and I even had my turbo's replaced due to whine stock last year. It would be nice to know what the correlation is. All the tuning companies say 'oh your fine' but really, we arent. I know boost #'s that the gauges hit ISNT what the turbo is spinning, so I hope OP can elaborate on this.

In essence you want to read pre intercooler boost.

Me too. I bet I pre-boost about 20-22 PSI to try to make 18 PSI on a stock intercooler. Scorching Hot Temps. Meth FTW.

As far as turbo whine, I dont think there really is a cause for concern. Its a wheel spinning it 100's of thousands of RPM's its bound to make some noise. Plus they are tiny compared to traditional upgraded turbo's.

[Dackz]

But the fact it gets worse as worse and makes it when warm, and it even gets louder and louder overtime is concerning. People here are getting them replaced. Sure, I'll get upgraded turbos down the road if this happens, but it's not good. I guess now we need someone at this elevation to do what the OP did.

I dot even think stock boost levels are good here on these small snails over time, since dme can 'raise' boost to 10.5psi when hot and conditions need it, then that's 14psi they are turning stock. And if I go up to the mtns at 8k ft then that's 16psi stock possibly. Pretty absurd. I wish a tuner or turbo manufacture would address this more.

Like I said, each company I have asked says yea it's fine but never adresses the elevation issue and what strain it may cause.

[Joshboody]

Originally Posted by Dackz

But the fact it gets worse as worse and makes it when warm, and it even gets louder and louder overtime is concerning. People here are getting them replaced. Sure, I'll get upgraded turbos down the road if this happens, but it's not good. I guess now we need someone at this elevation to do what the OP did.

I dot even think stock boost levels are good here on these small snails over time, since dme can 'raise' boost to 10.5psi when hot and conditions need it, then that's 14psi they are turning stock. And if I go up to the mtns at 8k ft then that's 16psi stock possibly. Pretty absurd. I wish a tuner or turbo manufacture would address this more.

Like I said, each company I have asked says yea it's fine but never adresses the elevation issue and what strain it may cause.

off topic... topic is timing curves. but get something that gives you full control. Standback maybe the best... do some research and don't trust in what anyone says. there's information on every popular tune here.

[Dackz]

Sorry, it is OT but straight answers are never given, ive done the research and no one states what the psi levels really are. A tune does no good if stock it runs high but there are no answers to what the psi levels are (how much extra). Sorry for hijacking.