[slay2k]

Originally Posted by type-dRew

You need to log with dsc off. Never log with traction control on

Understood.

Originally Posted by Sgop335

Torque limit 1 in the log...

Huh! Didn't even realize that was being logged. What the hell is traction control doing kicking in at 4800rpm in 2nd under full 17psi anyway? At that point the Michelin PS4s should be glued to the road, no? Or is this preventing the car from going sideways?

I did notice (once) in 3rd, under full boost going 50+, the car did feel like it torque steered, or wanted to steer sideways, which is obviously pretty odd for RWD. Recent alignment, etc. Thoughts welcome.

Originally Posted by Saif2018

It could be the boost solenoids,

I didn't get any timing corrections on stock, strange that you get it using 93, and so many, that many timing corrections will definitely cause power loss, wether you think you feel it or not.

As for your lag, I'm pretty sure it isn't caused by the intercooler simply because its 7.5 inch instead of a 5 inch one.

Makes sure you check all connection points including the vacumn cannister where the lines connect to, top and bottom.

If you still can't find anything, a leak down test maybe a good idea.

Although it does not look like you have a significant boost leak anyway since your hitting close to target boost.

Thanks for taking the time to respond. It could just be that the fuel here sucks, no? That's kind of the consensus from people I've talked to, at least. I thought solenoids tend to throw codes or max out WGDC, etc?

[slay2k]

BTW, to those insisting 7.5" and 5" are identical in terms of lag, here's the response I got from Ken Atkinson @ Wedge Performance. If memory serves, he created the original OTS maps for MHD.

We can do a custom tune, but your core volume is too high for the turbo to fill up now over the rpm increase. You should have installed the 5" step.

I'm silly enough to downgrade to achieve the perfect response, but thoughts welcomed.

[slay2k]

Also noticed my oil temps are now 10-15 degrees higher, hitting a max of 260-265(!) during hard runs. To be expected now that it's pushing 18psi?

[Smgs1992]

Originally Posted by slay2k

Also noticed my oil temps are now 10-15 degrees higher, hitting a max of 260-265(!) during hard runs. To be expected now that it's pushing 18psi?

Im pushing 20psi and mine never gets above 245

[Impreza98]

Originally Posted by slay2k

BTW, to those insisting 7.5" and 5" are identical in terms of lag, here's the response I got from Ken Atkinson @ Wedge Performance. If memory serves, he created the original OTS maps for MHD.

We can do a custom tune, but your core volume is too high for the turbo to fill up now over the rpm increase. You should have installed the 5" step.

I'm silly enough to downgrade to achieve the perfect response, but thoughts welcomed.

To me this isn't surprising. In the Subaru world, it is generally accepted that when moving from a top mount intercooler to a larger front mount, response time and lag will increase. This basic principle would apply to any care I would think.

[type-dRew]

Originally Posted by slay2k

Understood.



Huh! Didn't even realize that was being logged. What the hell is traction control doing kicking in at 4800rpm in 2nd under full 17psi anyway? At that point the Michelin PS4s should be glued to the road, no? Or is this preventing the car from going sideways?

I did notice (once) in 3rd, under full boost going 50+, the car did feel like it torque steered, or wanted to steer sideways, which is obviously pretty odd for RWD. Recent alignment, etc. Thoughts welcome.



Thanks for taking the time to respond. It could just be that the fuel here sucks, no? That's kind of the consensus from people I've talked to, at least. I thought solenoids tend to throw codes or max out WGDC, etc?

you dont need to have tire slip to have tc kick on, which is why you log with it disabled

i have tc kick on in 3rd gear if i dont log with it off...and im awd

[Smgs1992]

Originally Posted by Impreza99

To me this isn't surprising. In the Subaru world, it is generally accepted that when moving from a top mount intercooler to a larger front mount, response time and lag will increase. This basic principle would apply to any care I would think.

Thats essentially the response i got from another bmw forum that isnt to be mentioned on here

[slay2k]

Originally Posted by Smgs1992

Im pushing 20psi and mine never gets above 245

I'm guessing you have a factory oil cooler.

Mine does not.

Not sure if I should be concerned or not, since it never actually overheated. I guess I could always run the MHD max-cool-mode or whatever, probably at a cost.

[slay2k]

Originally Posted by type-dRew

you dont need to have tire slip to have tc kick on, which is why you log with it disabled

i have tc kick on in 3rd gear if i dont log with it off...and im awd

What actually triggers it, in that scenario?

[slay2k]

Originally Posted by Impreza99

To me this isn't surprising. In the Subaru world, it is generally accepted that when moving from a top mount intercooler to a larger front mount, response time and lag will increase. This basic principle would apply to any care I would think.

I assume this applies to a FMIC-to-FMIC scenario just as much as a TMIC-to-FMIC one, then.

[Smgs1992]

Originally Posted by slay2k

I'm guessing you have a factory oil cooler.

Mine does not.

Not sure if I should be concerned or not, since it never actually overheated. I guess I could always run the MHD max-cool-mode or whatever, probably at a cost.

I do.
I thought bmw would install one free of charge if yours didnt come with one. However idk if that ship has sailed given the age and probability of not being the original owner

[Jeff@TopGearSolutions]

Originally Posted by slay2k

Understood.



Huh! Didn't even realize that was being logged. What the hell is traction control doing kicking in at 4800rpm in 2nd under full 17psi anyway? At that point the Michelin PS4s should be glued to the road, no? Or is this preventing the car from going sideways?

I did notice (once) in 3rd, under full boost going 50+, the car did feel like it torque steered, or wanted to steer sideways, which is obviously pretty odd for RWD. Recent alignment, etc. Thoughts welcome.



Thanks for taking the time to respond. It could just be that the fuel here sucks, no? That's kind of the consensus from people I've talked to, at least. I thought solenoids tend to throw codes or max out WGDC, etc?

Always datalog without traction control on, the system can intervene even if you don't think it is, it's very sensitive.

[dcorn]

Yeah, I'm gonna go on record with the "bigger IC = more lag" team. You guys think the turbos can pressurize a much larger volume in the same amount of time? Nope.

[Chris@VargasTurboTech]

A bigger intercooler can definitely add more lag, it's about the velocity of air and time getting through the system. Remember, velocity doesn't increase with increased boost.

For many people that wring out turbos very hard, or live in extreme climates, going to a larger intercooler is a pretty good trade, but if you're going for responsiveness, that's really a different setup.

There is some decent literature out there about the actual time differences in different applications, and IIRC a large and lousy flowing FMIC can add something ridiculous like well over a second of lag. Which means it's worth while to size the FMIC correctly for your application... but if you have to err, err on the big side. High IAT's is awful for power. Some of the large single or twin guys may not notice considering their powerband and how the car is used.

If you're not opposed to the idea, a smaller (well designed) FMIC and a meth nozzle would be a good means of controlling temps and keeping responsiveness as good as you can get.

I live in Arizona, so the biggest honking intercooler I can get in there is pretty much required.

[slay2k]

Originally Posted by Smgs1992

I do.
I thought bmw would install one free of charge if yours didnt come with one. However idk if that ship has sailed given the age and probability of not being the original owner

Yeah, fat chance on a 13 yr old car where I'm the 3rd owner

I'd consider an aftermarket oil cooler, but right now I haven't broken 265, so probably not worth it. Also, no idea who's even reputable in that space.

[slay2k]

Originally Posted by Chris@VargasTurboTech

A bigger intercooler can definitely add more lag, it's about the velocity of air and time getting through the system. Remember, velocity doesn't increase with increased boost.

For many people that wring out turbos very hard, or live in extreme climates, going to a larger intercooler is a pretty good trade, but if you're going for responsiveness, that's really a different setup.

There is some decent literature out there about the actual time differences in different applications, and IIRC a large and lousy flowing FMIC can add something ridiculous like well over a second of lag. Which means it's worth while to size the FMIC correctly for your application... but if you have to err, err on the big side. High IAT's is awful for power. Some of the large single or twin guys may not notice considering their powerband and how the car is used.

If you're not opposed to the idea, a smaller (well designed) FMIC and a meth nozzle would be a good means of controlling temps and keeping responsiveness as good as you can get.

I live in Arizona, so the biggest honking intercooler I can get in there is pretty much required.

Thanks Chris.

I'm in PR, the weather here is about 20 deg cooler relative to yours (not sure how you do it, man). And I don't wring my hamsters that hard, max 18psi.

So I'll probably end up with a 5" at some point.