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Old 06-01-2018, 09:00 PM   #1
Blade3562
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IS38 1.8T Info/Discussion

Ok well I finally had my IS38 installed yesterday, and found a few things out that weren't posted online so I figured it's time we had a thread for these things.

Early production 1.8s came with an F revision coil pack, these will not work with the IS38. On our test drive in low boost it resulted in cylinder shutdowns and misfires. The recommended coil pack is currently the BorgWorner K revision. I have the part number written down, I'll update this shortly.

APR no longer recommends the IKH24, but the dealership recommended the IKH01-24. I had a set of the IKH24 installed for 5k, but replacing them with the IKH01-24 and newer coilpacks totally smoothed out the common idle stumble. The IKH01-24 is a 30k interval plug which is a nice added bonuses.

Heat soak is very pronounced with the IS38, you can get by without an intercooler(I currently am waiting to install mine), but it will leave you bummed out.

Although this may be beta related, if you are climbing a long hill in top gear and you attempt to accelerate from vacuum to boost it will throw an EPC. The epc will prevent you from getting any boost and goes away with an ignition cycle.

The GFB DVX will not work with 1.8T IS38s without some modification to your wiring harness, but the GFB IS38 DV+ will.

The 5 speed is definitely not ideal for the IS38, it's probably better suited for the IS20. Second and third gear are spaced awkwardly and third way too long for any sort of highway pulls. Since the IS38 develops power later and furher into the redline you want to start in second, but you are only in second gear for a second before you need to shift into third. However if you start in third the boost takes so long to develop you will have too much ground to make up. This issue really presents itself when you try to overtake a car in a tight gap on the highway lol. If you have a 5 speed I say go IS20.

A gauge cluster swap is probably a smart move. I want a digital one, but the original cluster redline is 6000, with the IS38 the new redline is around 7500. A virgin(new or under 100km/60mi) Golf R cluster should be plug/play with mileage coding.

More info to come, and I'll update as time goes on. One last note, it hauls ass. It's definitely in the 11s.
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Old 06-01-2018, 09:34 PM   #2
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What do you mean by the IS38 the new redline is 7500? Wouldn't the engine components (cam/springs) have more to do with where your redline should be to ensure safe engine function rather than where your turbo develops efficient boost?
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Old 06-01-2018, 09:58 PM   #3
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Yep. Mine is capped at 6700.
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Old 06-01-2018, 10:17 PM   #4
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Ironshade found out some of this with his. It doesn't like the long pull of the third gear. The IKH01-24 Densos are the race plugs. They are like $30 each. The regular IKH24 are still fine to use. You just need to change more often. Brisk Silvers are another good option. I think you're optimistic about 7,500. Maybe 7,000 at most. Haven't seen anyone push it that high yet. Now get to the track and get some times!
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Old 06-01-2018, 10:39 PM   #5
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It pulls past 7k, we did it a few times on the test drive and I did a couple more pulls on the way home for science. Maybe it's because it's a beta tune they let the revs guy higher, maybe it's the single variable cam that allows it to rev that high I'm not really sure. It's a totally different animal from the IS12 it's not what I was expecting. The exhaust even sounds entirely different now, much much much much louder lol. I really wonder what a HPFP and injector upgrade would do. The TTE601R is probably the perfect turbo for a 1.8 head 2.0 block build.

One other thing: motor mounts, I have BFI engine/trans and VWR torque arm. They aren't enough to hold up to the IS38, so I'm hoping I can convince 034 to release a track series mount for the 1.8 5spd/tip cars
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Old 06-02-2018, 01:10 AM   #6
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7500 RPMs?!?! Does your car already have the 2.0 block? Just wondering because it doesn't look like the IS38 is a good match for the 1.8T as the IS38 and accompanying APR tune have been out for less than a year and we're already starting to see engine failures. I'm really glad I went with the IS20. Please be careful especially if you're revving it that high.

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Originally Posted by Blade3562 View Post
It pulls past 7k, we did it a few times on the test drive and I did a couple more pulls on the way home for science. Maybe it's because it's a beta tune they let the revs guy higher, maybe it's the single variable cam that allows it to rev that high I'm not really sure. It's a totally different animal from the IS12 it's not what I was expecting. The exhaust even sounds entirely different now, much much much much louder lol. I really wonder what a HPFP and injector upgrade would do. The TTE601R is probably the perfect turbo for a 1.8 head 2.0 block build.

One other thing: motor mounts, I have BFI engine/trans and VWR torque arm. They aren't enough to hold up to the IS38, so I'm hoping I can convince 034 to release a track series mount for the 1.8 5spd/tip cars
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Old 06-02-2018, 01:44 AM   #7
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IS38 1.8T Info/Discussion

The stock 1.8t redline is 7200 and it’s on the cluster. You have to look at it correctly.

Congrats on the upgrade though.

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Old 06-02-2018, 01:58 AM   #8
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Originally Posted by Armchair Racer View Post
7500 RPMs?!?! Does your car already have the 2.0 block? Just wondering because it doesn't look like the IS38 is a good match for the 1.8T as the IS38 and accompanying APR tune have been out for less than a year and we're already starting to see engine failures. I'm really glad I went with the IS20. Please be careful especially if you're revving it that high.
1 failure that was stacked, running meth, and pushing the envelope as far as he could, so let's not overreact. There's plenty of 1.8/IS38 cars in the Alltrack/GSW/Golf Facebook groups and this is the only failure I'm aware of.

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Old 06-02-2018, 02:05 AM   #9
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And it wasn’t the turbo nor tune that caused it either. But, that’s all I’m going to say.


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Old 06-02-2018, 02:29 AM   #10
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Yes it's the first failure we've heard but you have to remember how new of an upgrade this is for 1.8T owners. The miles haven't been racked up yet.
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Old 06-02-2018, 02:38 AM   #11
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I thought it was multiple failures from your last reply...


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Old 06-02-2018, 02:43 AM   #12
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It's the English language. Read it again. Doesn't mean there are multiple failures.

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I thought it was multiple failures from your last reply...


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Old 06-02-2018, 03:02 AM   #13
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“We already saw one engine failure”

Vs

“We are seeing engine failures.


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Old 06-02-2018, 03:12 AM   #14
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My 2 cents. 5mt on is38 is a monster. You on base flash apr tune. 23-16psi. I run 28psi taper to 24psi at 7k rpm and car pulls like a freight train. Its a low to mid 120car. That being said. Base apr flash ya has some to be desired. Turn it up and its a completely dkfferent animal. I get zero corrections and no misfires. 5mt is an absolute beast for highway rolls. And the spacing is a 2-3 is fine i rev to 7k and its puts me right in power zone.

Also you dont need injectors or any fueling upgrade.
I pulled hpe650 hennesey gen2 ctsv 60-130mph by a car
I pulled vargas stage 2 upgraded turbo n54 (530whp) by half a car 40-140 (we did alot of pulls)
I pulled a bmw 840i turbo on v8 on 15psi (490whp) by bus lenghts lol.

The reason 5mt actually works great is the wheelspin to lag ratio is perfect. Long gears mean no crazy wheel spin. You can load car spool and stay in power for a long time. Might not feel the fastest cuz you just riding out a gear instead of banging gear but trust me.. my is20 setup on 27psi would’nt even hold a candle to the is38 set up. 70-110mph i dropped 1 full second lol

Logs
Jb4 stack
https://drive.google.com/open?id=18U..._BTzlERI7ukPUI

Apr vs jb4 stack +6psi
https://drive.google.com/open?id=1sF...DrnrWDzNgcGFSA

Accleration video https://drive.google.com/open?id=1Px...idsIudNmH7EZ7O

Armchair racer : theres only been one is38 failure on 1.8tsi. And that car was stacked, r injector, and ethonal mix with 17’ advance (apr100) on water meth and running same boost i was. It took a shit due to leaning out a cylinder not because of power.

Also will be going to drags and dyno soon to see what she does. But baised off of races i’ve done I expect some really good numbers on dyno. And if i can drive a decent track time. Ha gotta find a set of hoosiers first

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Old 06-02-2018, 04:03 AM   #15
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Blade, you say you have a beta tune, what tune do you have?

Ironshade, when did you upgrade to IS38? What tune are you running with that?
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Old 06-02-2018, 04:10 AM   #16
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Quote:
Originally Posted by 4MotionWagen View Post
Blade, you say you have a beta tune, what tune do you have?

Ironshade, when did you upgrade to IS38? What tune are you running with that?
I’m on a beta tune as well. Apr is38 93 oct
I Upgraded 4/28/18. I have 3k miles on setup so far. I’m FBO with watermeth and jb4 stack
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Old 06-02-2018, 04:59 AM   #17
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Low to mid 120's with an IS38 on an 1.8T with a 5-speed? I'll believe that when I see it. Chuck G trapped 119 recently but his wagon was completely gutted, running an open downpipe with no catback etc. The difference is his car is DSG with lightning quick shifts and much much better gearing than the 5-speed manual. I don't see anything that would make the 5-speed trans a "monster" as you call it. As others have stated, the gearing is super long and not close ratio like the other boxes. Even if you're shifting at 7K+ RPMs, you're still going to be at a much lower RPM after each shift compared to the DSG. This results in you having to crawl back into the powerband. Compare on a dyno sheet the RPMs you're at after each shift vs the DSG. There will be a huge difference. With the 5-speed I think you'll be in the 115-117 range at the strip.

The way the ring land failure was described, it didn't sound like it was from detonation or a lean condition. It just sounded like it was too much prolonged stress over time. Which could suck for a lot of IS38 owners since the mod is relatively new for the 1.8T and not too many people have racked up a lot of miles on their setups yet.
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