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    1. Member VwBoy2.0L's Avatar
      Join Date
      Sep 30th, 2008
      Colorado Springs
      2002 Volkswagen Golf 4 dr 2.0L
      09-22-2017 10:58 PM #1
      Hello how much hp can a stock 1.8T block hold with stock internals? The reason I ask is because I haven't made up my mind to go with the Big Turbo or KO4.

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    3. Member
      Join Date
      Dec 7th, 2014
      2007 Black B6 ___________ Passat, 2.0T ___________ 2004 Grey Silverado ___________ 1500, 5.3L Z71
      09-23-2017 06:00 PM #2
      Quote Originally Posted by VwBoy2.0L View Post
      Hello how much hp can a stock 1.8T block hold with stock internals? The reason I ask is because I haven't made up my mind to go with the Big Turbo or KO4.

      First of all, you're on the vendor marketplace subforum... this isn't the best/right place to post. I'm not even sure how I came across this myself in the first place...

      Second thing, I don't know the tolerances of the 1.8T (I'm more knowledgeable on the 2.0T platforms) but I can tell you 2 things:

      1) It's not about HP, it's about torque. HP is a basically a theoretical figure that is a function of torque, torque is the real number because torque, physically speaking, is the force that is actually acting. The motor produces a certain amount of torque at the crank and then a certain amount of that power (after accounting for drivetrain losses, etc.) actually goes to the wheels; we call this crank torque or wheel torque. Crank horsepower, also known as brake horsepower, is just mathematically derived from the amount of torque at the crank. HP isn't what bends a rod in your engine if you have too much, that is what torque does. So what you want to be looking for is what the tolerances of your stock motor are in terms of torque not horsepower. That being said...

      2) I can 100% guarantee you that you your stock motor will not handle a big turbo and, if I recall correctly, the 1.8T doesn't always fair so well even at K04 power levels (but again the 1.8T isn't my specialty so bear that in mind). A little nuance that people often don't consider is that while the big turbo makes more power at its peak than a K04 for sure, the K04, being a smaller turbo, is very torquey/peaky and has a more instantaneous onset of high torque, whereas big turbos have a smoother onset. So in a way K04s can actually be more dangerous for bending a rod in some cases than a big turbo. Don't take that the wrong way though, that doesn't mean you can safely run a big turbo, it would still definitely produce more power than your stock block could handle; what I'm really saying is that the K04 can be dangerous too even if it is weaker overall. The good news though is that you could get a K04 and then have the car tuned to stay within the safe range of torque/torque delivery of your motor if you get the tune done custom.

      While I can't give you the exact numbers, I hope this helps you understand what to look for and what your options are. I assume you also realize that before upgrading your turbo there are more things to consider than just "can my motor handle it", you also need to have sufficient fueling to achieve those power levels. I'm not sure if the 1.8T fuel pump is capable of outputting enough fuel pressure on the rail to support a K04/tune but my guess is probably not. You will probably also need upgraded injectors. You may need even more. Those are my guesses, I don't know the 1.8T limitations for sure so do your own research but don't be surprised if you need to do more than just throw on the K04 and a tune in order to actually take advantage of it.
      Last edited by Thy_Harrowing; 09-23-2017 at 06:10 PM.
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    4. Member 1fast2liter's Avatar
      Join Date
      Apr 4th, 2005
      beaver dam WI
      2000 audi tt 180q
      11-01-2017 09:23 PM #3
      The stock bottom end is good for about 310tq. I ran a persision 5857 at 20psi for 10k miles with no issues. You want more replace rods. While i.e rods and such are great their expensive. Scat rods are about 350 a set and I made over 600whp on them.(587wtq iirc) as stated a big turbo has lag so hits peak tq later in the power band. Anything over 400 need to replace exhaust valves with fera or supertech. Around to 500 to 600 level look at replacing main studs with arp or comparable. As the bottom will start to flex. Anything over 700 and your looking at a girdle. I should mention at time of rod install arp headstuds are a must. At the moment everything in my motor arp even flywheel bolts

      Sent from my SM-N950U using Tapatalk
      infinity front and sides,votex rear,st coilovers,eurodyne tapp 1000cc tuned,hks ssq bov, pte 5857 pagparts turbo kit with 38mm tial wastegate. spec stage 3, custom intake, bbm fuel rail, billy boat 3in exhaust,ecs bleeder block,mbc,fmic,bfi mounts,cm flywheel,front mount interccoler, aeb head cat 3652 cams, scat rods je pistons super tech valves and springs.

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    6. Member
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      Jan 23rd, 2008
      Toledo, OH
      2004 AWP Jetta; 1996 AAA Passat; 2003 S-10
      06-30-2018 03:18 PM #4
      All this good info should be added to the 1.8t FAQ...?

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    7. Member Disgruntled Ziemniak's Avatar
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      Oct 24th, 2016
      In the cupboard down by your knees
      MIL Machine
      02-06-2019 01:48 PM #5
      I remember reading this a while back. Will never hit those big numbers, but useful none the less
      Your favorite Ziemniak, hold the gravy.

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