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Discussion Starter #1
Hey all, just looking for some advice and opinions. I'm looking to finally pull the trigger on a turbo upgrade within the next 6-12 months. And working on a checklist. As our platform continues to dwindle, a lot of older links no longer work and sellers no longer carry parts so its becoming a bit more difficult to sort through what is still useful information and what is no longer relevant.

I have read through the newbie guide again because well, its still one of the best written guides. Anyone coming across this post, with the same idea as me, please make sure to check it out.
- https://www.gencoupe.com/new-member-section/216521-ultimate-genesis-coupe-newbie-guide-modding-must-read.html#post2287481

Unless I'm mistaken, will the 2010-2012 aftermarket exhaust manifolds work with the BK2? If so, does anyone have some preferences or recommendations to give? Genracer seems to have MXP and CP-E options and the cost isn't really a concern. Would rather go with the more recognized or durable option.

For turbo size I was considering the GTX3067R, but I'm up for recommendations. From what I can tell most turbos are within $500 of each other and I would consider a turbo with more potential if it costs only a couple hundred more. Might be overkill for my existing goals, but if its in budget and I plan to take full advantage of down line. I'm looking to settle around 500 WHP (375-400lbs torque). From what I've read most BK2 can hit 500 easily, but time to reforge internals past that. I was already considering a meth kit for this.

It also seems like I"ll need to redo my piping to get things fitting? I figure with the top mount turbo will need to relocate the BOV to the cold side and there are probably several costs to consider. Would love some advice on this. Most of the products I find include replacement intercoolers and from what I've read the BK2 intercooler is fine up for the power range I'm looking for.

Speaking of, Is there a check list that goes over the engine components that are upgraded prior to going for high power? Or maybe a good article to read through? I wish I had a local tuner group to chat with.

I personally haven't had any issues with my SFR 1.5 tune and they are the closest mainstream tuner I am aware of (about 6 hours drive). I'm in Raleigh, NC. I was going to have a chat with Phantasm Motorsports as they offer Haltech chips and tuning for the Genesis coupe. Making the switch and using E85 has been considered, but reading indicates I'd need bigger injectors and the biggest downside is the Haltech doesn't talk with the A/C well. I've seen someone on the forum found a way to make them talk and was selling the solution. I won't throw out the idea entirely, but the extra work was kind of a concern. Also, been hearing a lot about Alphaspeed recently about remote tuning options. Anyone aware of a vendor in North Carolina that may work with them or the best way to contact Alphaspeed? I seemed to find their facebook page and references on BTR only.

I'm sure more things will come up. Open to advice and thoughts. Anyone curious about my existing mods, they are mostly in the signature.

P.S. NC requires yearly inspections, so I have to keep a primary CAT. Currently I have a CP-E downpipe with primary cat and so far no CEL. I've been fortunate as I have seen some people mention they still ended up with a code. I did replace my stock gauges and one of them is AFR. Idle about 14.5 and WOT like 12. Figure its pretty rich as its a canned tune and its a bit safer to be rich than lean.
 

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Discussion Starter #2
Okay, after spending some more time researching the exhaust manifolds for the earlier models should work with the BK2. Checking what BTR offers in the realm of turbo kits I noticed quite a few mention needing a BK1 style 02 housing.

My CP-E downpipe replaced the entire piping from turbo to mid-pipe so it should have included the O2 housing. I assume I may have some fitment issues going forward? I can't really find a good comparison of the BK1 vs BK2 O2 housing. From the few comparisons I'm finding it seems BK1 has 3 bolts, while Bk2 has 5 and a much different shape? If this is the case, I assume it just won't line up with most aftermarket turbos?
 

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Okay, after spending some more time researching the exhaust manifolds for the earlier models should work with the BK2. Checking what BTR offers in the realm of turbo kits I noticed quite a few mention needing a BK1 style 02 housing.

My CP-E downpipe replaced the entire piping from turbo to mid-pipe so it should have included the O2 housing. I assume I may have some fitment issues going forward? I can't really find a good comparison of the BK1 vs BK2 O2 housing. From the few comparisons I'm finding it seems BK1 has 3 bolts, while Bk2 has 5 and a much different shape? If this is the case, I assume it just won't line up with most aftermarket turbos?
Bk2 is twinscrol turbo. Bk1 is not twinscrol.
Any bk1 oem/aftermarket exhaust manifold will bolt right up to your bk2.
Bk1 o2 housing is different from bk2.
You basically want a bk1 setup and that means your cpe o2 housing will not fit.

Sent from my SM-G960U using Tapatalk
 

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Discussion Starter #4
Thanks for the clarification!
 

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I am literally in the same boat here in GA. I have a tuning garage here called Evolved Tuning that does do some work on GEN coupes but they don't specialize in it like SFR or BTR but from what I have seen they do good work. I am also looking for any and all advice on motor work to get the BK1 turbo ready. The research I have yielded showed a few BK 1 builds doing a low engine build by replacing the pistons, rods, and ARP studs to net around 500 whp/445 tq reliably on about 12-13 lbs of boost which is all I am after. I am willing to answer any questions about my build to help this along :).
 

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Discussion Starter #6
I'm still shopping around. After talking to a few friends I've been looking at the newer Garrett turbos, the G25 series. They are smaller than some of the more common builds, but might be able to hit similar or better numbers while further reducing spool time. Trying to read up on compression maps and plotting performance.

Haven't decided on any, but were eyeing the G25-550 and the G25-660. Seems the G25-550 is more capable than the GTX3071r and the G25-660 is somewhat comparable with the GTX3076r, but spools faster. The G30-770

One of the few comparison videos, though the car wasn't running well. It does show the GTX3071r and G25-550 produce very similar numbers with less time to spool.
 

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Great initial post with plenty of pertinent information. I'd recommend the G25 550 unless you do go an E85 build. The 660 spools about 400 RPM later on a 2.0 so expect full boost around 4200 rather than 3800. Also the power difference at low boost is minimal, only pushing the 660 to the max gets you to the higher HP numbers which makes it less useful for mild builds. If I ever do an upgrade i'm going to try the 550 with the smaller or mid size turbine AR and run it on stock ECU. I want to test and tweak it to see if I can run it stock boost levels on stock injectors around 400HP or 350 to the wheels.
 

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Discussion Starter #8
So if you ever upgraded you'd look at the G250550 w/ 0.72 A/R? I do see a 0.49 A/R but with a T25 inlet instead of v-band. I was looking for some comparison videos and there didn't seem to be too much noticeable differences between the the G25-550 in either AR (didn't see 0.49 tested).

I figure I go with it the 0.72 would be my choice.
 

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I'd consider the T25 but that would be for stock replacement basically or twin turbos on other motors. The .72AR should do just fine but may be more power than im looking for (closer to 390whp) at 20 psi of boost
 

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If this is allowed it's a very useful source for compressor map charting. There are pages and pages of info but these are from this current year with the new Garrett offerings. Our engines are 86x86 so it's easy to interpret responsiveness. (Longer stroke more tq down low) For mobile phone start after page 50 or late 2018 to 2019
 

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Discussion Starter #11
Nice find. I like the overlay comparison of the two turbos. I'm curious how they were made, like is there an app for that?

Kind of reaffirms my thoughts. Based on my goals the G25-660 makes sense. Several calculations put me at around 55CFM to peak at 500whp. Depending on fuel and air temps that is still roughly 50-60.

Trying to determine my best setup option for the downpipe though. So I purchased the CP-E exhaust manifold on sale black friday. Free shipping, $80 bucks off wasn't bad (too bad the 10% off didn't stack :sneaky:). The CP-E big-turbo downpipe they offer is meant to be a direct attachment, but I have been trying to keep at least one high-flow cat to pass emissions without finding a "friendly" inspection shop. Shot them an email to see if they are willing to do a custom order. Otherwise reaching out to a local exhaust shop to see what they can do for me.

I have the CP-E downpipe with high-flow cat for the 2013 model and have been cel-free so far. I know the cel can be disabled, but NC inspections check for the ready signal. Not to mention I do want to block some of the smell. One friend had the idea of putting the high flow cat where the secondary used to be, but that would also require moving sensors and I was concerned it may not get hot enough to be as efficient. I think I read some had mixed results trying this. I'll search around a bit.

I'll probably actually start a build thread once I gather some more pieces. Definitely gonna need to look at the fuel system next.
 

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Discussion Starter #12
Alright, so looking at injectors to run E85 and I'm trying to decide the best size. Several calculators put me between 1300cc and 1500cc for the size. One friend recommended the 1300s since I'm also planning on running meth injection, but was looking for some other opinions.

Brand wise I was looking at Injector Dynamics
- Model: 1300.60.14.14.4
 

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If you run E85 you won't need meth injection. 1500CC would be best if you are maxing out the turbo on E85. Your choice which you choose. 1300 will suffice for most builds though.
 

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Discussion Starter #14
Hey JOutterbride and happy almost New Year!

The meth was just additional measures to keep temps down and keep risk of detonation low. Going larger would give me some wiggle room though, but I did hear some suggest idle may be rough.
 
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