Welcome!

[ryan1stinger]

I’m going to answer the boost question,actually getting 21 lbs of boost from these turbos is BAD for longevity. ~19 should be the peak before the stock Turbo is just being pushed too hard.

Most of the 21psi guys are running upgraded FMIC, downpipes, intakes.... at the bare minimum you should be spaying some water/methanol injection if you don’t have any of the other mods if you are planning to run boost that high daily.

HUGE: Do not pay too much attention to brief boost spikes look at the boost is actually holding through the run. Most are going to HOLD the safer 19psi.

Sorry for the numerous posts here, but have you or anyone else found the boost limits for our stock turbos?

I reached out to Garrett by Honeywell regarding our stock turbos and here is the info they shared. Not willing to share the much needed data unfortunately. Too bad.

“I am with Full Race Motorsports, we are a Performance Distributor for Garrett.

Unfortunately the specs for the wheel sizing is proprietary information that can't be shared from Garrett. They are designed for the OEM application on the Stinger GT, so there isn't any data to share with you regarding supported boost, compressor maps, etc. “

 

[TwinSnails]

That’s actually pretty typical with OEM optioned turbos. What it will take is for a company to move forward with developing an upgrade.

The limits are based loosely on comparative turbos, above and below ours in relative size.

There’s a post on one of the “bigger turbo” “upgraded turbo” threads from one of Garrett employees about the available next size up.

 

[ryan1stinger]

That’s actually pretty typical with OEM optioned turbos. What it will take is for a company to move forward with developing an upgrade.

The limits are based loosely on comparative turbos, above and below ours in relative size.

There’s a post on one of the “bigger turbo” “upgraded turbo” threads from one of Garrett employees about the available next size up.

So if I’m understanding this correctly an educated guess is being made as to what the limits are in terms of boost of the stock turbos, based on other turbos, and therefore the educated guess could be wrong meaning that all piggyback chip manufacturers are exceeding the limits and putting the turbos at risk and it’s only a matter of time before they fail.

I can understand the data is secretive as Honeywell and Kia in his case doesn’t want tuners to max out the turbos, because then if their is a failure they and the car manufacturer could be held liable.

With that being said, I have to believe that someone who works for one of the chip manufacturers has a contact at Honeywell that has access to this data.

I’ve already reached out to BMS and now I will reach out to RC and Lap3. I will report back on what I hear.

 

[Terry@BMS]

Sorry for the numerous posts here, but have you or anyone else found the boost limits for our stock turbos?

The risk for running too much boost is normally not that the turbo is damaged. That's a relatively easy fix. The real risk is a blown piston from running the turbo too far outside of its efficiency range, with too much back pressure, and too high of an EGT, which requires an engine rebuild to resolve. It's still early days for platform development. Some of the tuners are more experienced than others, some have access to tools and data that others don't, and some tuning systems have a lot more capacity for built in safety and diagnostics then others. Those in the know are not going to publicly share all the information they have at least not yet.

 

[ryan1stinger]

The risk for running too much boost is normally not that the turbo is damaged. That's a relatively easy fix. The real risk is a blown piston from running the turbo too far outside of its efficiency range, with too much back pressure, and too high of an EGT, which requires an engine rebuild to resolve. It's still early days for platform development. Some of the tuners are more experienced than others, some have access to tools and data that others don't, and some tuning systems have a lot more capacity for built in safety and diagnostics then others. Those in the know are not going to publicly share all the information they have at least not yet.

Given that, how high of PSI will the stock turbos support before losing reliability, and what mods are recommended to support higher boost?

 

[TwinSnails]

Pushing the limits of the stock turbos results in a mechanical failure....that chain reactions. If you are talking about making more power from the turbos - ultimately you will want to go bigger.

Going bigger normally creates more lag. Sometimes upgrading the turbo wheels result in more power at the same psi.

Supporting mods for helping the turbos live longer will be an upgraded FMIC and keeping them from overspooling.

 

[Terry@BMS]

Given that, how high of PSI will the stock turbos support before losing reliability, and what mods are recommended to support higher boost?

Turbo longevity isn't about "boost", it's about impeller speed and back pressure. Functions of boost, engine speed, baro, intake temps, etc, etc. But like I said engine longevity is the larger concern if you push things too far. Always consult with your tuner as to what they suggest you run given your fuel, modifications, goals, and risk tolerance.

 

[Ritz]

Turbo longevity isn't about "boost", it's about impeller speed and back pressure. Functions of boost, engine speed, baro, intake temps, etc, etc. But like I said engine longevity is the larger concern if you push things too far. Always consult with your tuner as to what they suggest you run given your fuel, modifications, goals, and risk tolerance.

I concur. You're likely to reach the limits of your pistons and/or connecting rods long before you max out the boost the stock turbos can provide. Like many manufacturers, Kia does engineer in some cushion on the upper bounds of materials strength in the engine, but I think when you start going into the realm of an additional 25+% power on the stock bottom end, the odds of breaking something start to go up significantly. I've done more than that on previous Audi vehicles I've owned and never had a failure, but I recognized that I was increasing my risk of engine failure and potentially reducing the service life of the drivetrain. Cost of doing business if you want to push the envelope.

Cheers!

 

[TwinSnails]

— I’m going to add. There’s a limit to the “efficiency” of the stock turbos before you are just pushing hot air through the engine just to reach “peak” numbers.

Obviously Kia was conservative at ~12 lbs of boost.

 

[Blitz]

Cannot find your intake on your facebook shop or website. Where can I check it out!?

 

[Terry@BMS]

BMS Stinger Intake isn't on our site yet. Soon!

 

[TwinSnails]

Can we seeeeee it, lol?

 

[Terry@BMS]

I left the car with Anthony our fab guy who's test fitting the production units. Will post a few when I have the production parts on. There are similarities and differences to other intakes out, I'll detail them in a new thread when the batch in our warehouse.

 

[Fl stingergt]

Quick question on jb4 map3 at 50 to 75 peddle input at 40 mph . Getting a surge while car is accelerating . Running firm 7. Map 2 is smooth. Any fix for that? Thanks

 

[Terry@BMS]

You can try the FUD bit7 pedal mapping on to see if you prefer a more linear mapping.

 

[Fl stingergt]

How is that done? I just wanted to make sure it wasn’t hurting anything. If I get in the gas all the way it doesn’t surge.

 

[StungBlueGT2]

Quick question on jb4 map3 at 50 to 75 peddle input at 40 mph . Getting a surge while car is accelerating . Running firm 7. Map 2 is smooth. Any fix for that? Thanks

Seems like more and more people keep having this issue.Hope there’s progress soon on DWGC or whatever Terry said would completely resolve it.

 

[Fl stingergt]

You have any idea what fud bit 7 is stungbluegt2

 

[StungBlueGT2]

You have any idea what fud bit 7 is stungbluegt2

Under “user adjustment settings” there is an option that says “Future Use D”(FUD). Select it, then turn 7 On and save. Then save the user adjustment page as well. Just make sure to do all this with engine off, ignition on. Hope that helps and almost all the details you need about the JB4 is on this forum or here.Kia & Hyundai JB4 - N54Tech.com - International Turbo Racing Discussion

 

[Fl stingergt]

Thanks for that.