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IS38 1.8T Info/Discussion

Blade3562

Go Kart Champion
Location
Middletown, PA
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.

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.

The GFB DVX will not work with 1.8T IS38s without some modification, 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.

I've had my APR IS38 for 2 years and still enjoy driving it every time. APR is the best off the shelf tune, but if you plan to go flex fuel, MPI, etc United Motorsport is the way to go. Their FWD IS38 support is just around the corner.
 
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DAS_STIG

Banned
Location
Chicago
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?
 

TwinDad

Drag Race Newbie
Location
Fort Lee, NJ
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!
 

Blade3562

Go Kart Champion
Location
Middletown, PA
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
 

Armchair Racer

Go Kart Champion
Location
Florida
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.

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
 

crxgator

Drag Race Newbie
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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Faceman

Drag Racing Champion
Location
Long Island
Car(s)
'17 GSW 4Motion
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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crxgator

Drag Race Newbie
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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Armchair Racer

Go Kart Champion
Location
Florida
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.
 

crxgator

Drag Race Newbie
I thought it was multiple failures from your last reply...


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Armchair Racer

Go Kart Champion
Location
Florida
It's the English language. Read it again. Doesn't mean there are multiple failures.

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


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crxgator

Drag Race Newbie
“We already saw one engine failure”

Vs

“We are seeing engine failures.


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Ironshade

Go Kart Newbie
Location
Atlanta Ga
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=18Uh3sXPBH4KxcYGQ82_BTzlERI7ukPUI

Apr vs jb4 stack +6psi
https://drive.google.com/open?id=1sFgLXQaqWLUV_3TSnmDrnrWDzNgcGFSA

Accleration video https://drive.google.com/open?id=1PxdL4qAib7NF91m04NidsIudNmH7EZ7O

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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4MotionWagen

Ready to race!
Location
Michigan
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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