How do I get to 400whp?

[ralphie_43]

Is the tittle states I’m a reflectively new to the B5 I’ve had mine for 5 years but haven’t really messed with it. I plan to get another 1.8T QTM to do a small build on with the goal of around 400whp. How do I go about getting the number with the 1.8 T I really not have a solid basis for what’s needed for that. I have access to E85 regularly so I’m open to doing some E85 fueling options.


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[2001BTA4]

here is what I did: its not rocket science but it does cost money. And depending on what you think is alot of money, it gets up there. Once you do some part searching you will see. I did all the work myself except welding.
2001 audi a4 1.8 awm 5spd man
IE street cams
UM tune with pro maf
26 psi on pump 93
IE intake
IE drop in rods
RR stage 2 clutch. obviously no power gain but needed.
turbo back 3" borla exhaust
034 big turbo FMIC
870cc injectors
shitty spooling 5558 gen 1 precision turbo
spa top mount ex mani
stock small port head with supertech hardware
passes emissions
very important have a back up car
8500rpm redline, everyday since it was only making power after 5k really. hoping for better with 2.0 stroker and upgraded BB turbo
on a mustang dyno at 26psi on 93 fuel it made 411awhp@73** 340awtq@56** ill have to double check my dyno sheet. im off a little on rpms and maybe tq.

daily driven 4 season
not hard but no civic or pony car, so its not cheap in other words
here is my excuse for why is its not running right now, lol. Since i bought it in 13' its been up and down alot. since i took it home i had pressure built up in the coolant. head gasket was changed twice, block decked and head milled. but I couldnt find the reason for pressure in the coolant. finally last year the block cracked. Since i have way to much in it i went forward with a 2.0 stroker build. its at the machine shop now. hoping for 450awhp min to day dream of 500awhp on 93. basically i have what ever 93 allows me. still a daily car. I think ill do a build on this car eventually. out of all the car projects i had this gave me the biggest headaches, lol.

Just wanted to share because i felt too many people say its so hard to get 400awhp. Its not hard, but it aint cheap. Now if you have a shop do it, it will be very expensive.

[Blazius]

It does not cost THAT much money... People overbuild for no bloody reason. Get rods and exhaust valves, get a decent timing kit and a decent WP, done you are set motorwise. This is ofcourse without the turbo setup at all, but that varies loads. If you want more specific info , ask.

[2001BTA4]

Lol, whats not much to you? Not using yout own money? Sure its not that bad. Coming from exotics? Yup this is cheap. Been modifing high dollar cars before this A4? Yes cheap again. But if your coming from modifing LS's and civics and sbf's, i wouldnt call this cheap. But again we all have our idea of whats expensive. Heres a super quick run down of some of the main parts u will need. This doesnt include, shipping, tax, and miscellaneous. Also these are new prices. You be the judge as to is it alot or not.
1800 Turbo precision BB
1200 034 or custom exhaust
600 Down pipie
400 injectors
571 drop in rods
350 spa exhaust mani
950 Smf conversion
1100 UN with pro maf
500 Supertech valve train not including head work laber
1100 Fmic kit
Total 8571

Thats a far cry from bottom line
Theres no machine shop labor there, no tax or shipping.
When u do rods you will basically rebuild the motor, thats not in here.
No motor mounts/trans
No rear end bushings or stub mount
No replacing your old as suspension parts
No brake upgrades
Etc.

[2001BTA4]

Forgot to add cams and intake mani
Though i heard its possible to reach 400whp without it, if you need these its another 1600 est.

Of course this is my experience on 93 fuel. E85 might be cheaper. Hell if you feel lucky i seen a guy with his 1.8t jetta on e85 stock motor at 450ish whp. Its on youtube.

[A4edwin]

He asked how to get to 400whp I think that’s pretty specific

[AudiSon14]

Im interested as well to see ppls take on who actually broke 400 at the wheels with the 1.8t and if its even worth it..I mean im a tech by trade and feel like I can get pretty creative to eliminate labor and im sticking with VAGs. Im just torn between which platform and combo to go with to do an all out build and im not made of money..

So far I thought about;

*Just tearing down the 1.8 and building it up but ppl are killing there self to make 500+

*Vrt'n the b5 but it seems very involved, prob take me forever to do and end up a money pit b4 I actually enjoy it.

*2.7t swapping the b7 (my recent interest). slightly modern look, seems str8 forward and alot of support on the motor.


ps not trying to thread jack as im very interested on the topic as I thought about it before and the 1.8t are very easy to work on...

[MSq5]

Is the tittle states I’m a reflectively new to the B5 I’ve had mine for 5 years but haven’t really messed with it. I plan to get another 1.8T QTM to do a small build on with the goal of around 400whp. How do I go about getting the number with the 1.8 T I really not have a solid basis for what’s needed for that. I have access to E85 regularly so I’m open to doing some E85 fueling options.


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Get a B8-B8.5 S4 with the supercharged 3.0. 400 whp will be extremely easy and totally reliable on pump gas with just a flashed Stage 2 tune. We are seeing 480 crank hp (about 400 whp) with just pulleys and tune on pump 93. Period. Well over that with ethanol or race gas. The stock block and internals are incredibly strong. Heck, you don't even have to upgrade fuel pump or injectors. Stock blower. Some guys port it a bit.

By the time you build your engine, get it tuned and sorted out, you could have traded up and tuned an S4. Will your drivetrain handle 400 hp or will you be breaking stuff? Unless you are Quattro (was that an option?), 400 whp on fwd will just have tires going up in smoke even at part throttle.

Not trying to kill your plan, just pointing out alternatives and cost.

[ralphie_43]

Get a B8-B8.5 S4 with the supercharged 3.0. 400 whp will be extremely easy and totally reliable on pump gas with just a flashed Stage 2 tune. We are seeing 480 crank hp (about 400 whp) with just pulleys and tune on pump 93. Period. Well over that with ethanol or race gas. The stock block and internals are incredibly strong. Heck, you don't even have to upgrade fuel pump or injectors. Stock blower. Some guys port it a bit.

By the time you build your engine, get it tuned and sorted out, you could have traded up and tuned an S4. Will your drivetrain handle 400 hp or will you be breaking stuff? Unless you are Quattro (was that an option?), 400 whp on fwd will just have tires going up in smoke even at part throttle.

Not trying to kill your plan, just pointing out alternatives and cost.

I’m aware I daily a stage 2 s3 and that’s right at that 400hp mark. This would be purely a dream build I’ve wanted to do since forever cost isn’t a big deal as it’ll get spread out not dropping money in all at once


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[hawaiian punch]

I’ll sell you my turbo, manifold and down pipe that I currently make 400whp with. Build the motor pick up an intercooler and get more fuel


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[Blazius]

Man...


Taking a 1.8T motor wise basically does not cost anything... compared to other sub 2L motors. this isnt a tfsi.
The final cost always end up balancing money vs time. Time is doing your own research and waiting for deals or just spending money.

IE or Maxpeeding rods - 250~
Supertech exhaust valves - 210~
Revisions etc. - whatever you choose.
Cast manifold - ~100

You dont need to "kill" yourself to make big numbers.

As for turbo setups it all depends on you, a HX35+ or a big KKK goes for around 350 on ebay, or hell brand new AirWerks for 600-700 complete. Any ebay fmic will work or if you got buddy tell him to weld 2 tanks on a core. Piping depends if you can weld or not, if not it's obviously going to cost more but still cheap.

Fuelpump - walbro 255 , done.
Cams - are on edge at 400 whp, na intake cam or catcams or schrick or w/e.
Clutch - 1z flywheel, rs4 clutch disk, diesel pressure plate, done. All you need is research that is why I said, you need to ask more for detailed setup.

[2001BTA4]

I’m aware I daily a stage 2 s3 and that’s right at that 400hp mark. This would be purely a dream build I’ve wanted to do since forever cost isn’t a big deal as it’ll get spread out not dropping money in all at once


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If cost isnt a big deal the first thing id change is 400whp to 500 to 600whp seeing your doing e85 anyway. 400whp is not enough.

I did not know the b8 s4 has so much potential with stock supercharger. Thats cool. Im to deep in now though to switch though.

[2001BTA4]

Man...


Taking a 1.8T motor wise basically does not cost anything... compared to other sub 2L motors. this isnt a tfsi.
The final cost always end up balancing money vs time. Time is doing your own research and waiting for deals or just spending money.

IE or Maxpeeding rods - 250~
Supertech exhaust valves - 210~
Revisions etc. - whatever you choose.
Cast manifold - ~100

You dont need to "kill" yourself to make big numbers.

As for turbo setups it all depends on you, a HX35+ or a big KKK goes for around 350 on ebay, or hell brand new AirWerks for 600-700 complete. Any ebay fmic will work or if you got buddy tell him to weld 2 tanks on a core. Piping depends if you can weld or not, if not it's obviously going to cost more but still cheap.

Fuelpump - walbro 255 , done.
Cams - are on edge at 400 whp, na intake cam or catcams or schrick or w/e.
Clutch - 1z flywheel, rs4 clutch disk, diesel pressure plate, done. All you need is research that is why I said, you need to ask more for detailed setup.

I assume the prices you put for exhaust mani, ie rods was used? Because the prices i posted were current new prices. And thats up to you if yor ok with trusting a unknown used part.

My exhaust mani is out to be welded, its cast spa, bought it new.

Im not a fan of cheap parts and ebay turbos gor daily driver. And that why i listed new part prices. My toy car has a Chinese turbo but i wouldnt put one in my daily bt a4.

I never searched for used b5 a4 bt parts, so if these prices exist by all means go for it. I was just trying to be realistic. But if u do cams, and valves u might as well do springs. Having a shop do that is not cheap. Mine wasnt.

[AudiSon14]

lol Maybe I shouldnt have use the term "kill" yourself to make 500hp. I was just referring to that parts list above where guys are putting 10k into builds to make 400whp @ 8100rpm. Then what?. Thousands more on a stroker for acouple more hp?

I love the 1.8t b5 platform and still building 1 somewhat like how Blazius mention as Im a believer for power. but as im throwing parts at it and nights in the garage I sometime daze on the bigger picture and I dont think I could live with 450w if im doing a Build. There is different reasons to do it tho and I respect them all.

Its crazy what kids are showing up on the scene with now a days and a 10min flash via cell phone are ready to hang right there with you lol

[Blazius]

See thats just wrong, you dont need 10000 usd to make 450 HP( big Maybe maybe if pristine car price is included) , anyone who did that and spent 10k on it just overpaid or overbuilt or got scammed I dont know. These motors run 350 HP on a stock 058 block with a bigger T3 turbo anyday, and was proven by actual racing results, and only one failed in 1000+ race starts. What you absolutely need is rods just for safety and maybe exhaust valves if you dont watch your EGTs or didnt refresh old valves.

Now the supporting stuff is a different story. Clutch can be a bit expensive if you dont know what you are doing but I gave you a tip on a very good setup under 300. You need fuel pump and injectors. Injectors are another thing again, if you dont do your research or find deals you will pay handsome amounts just for a simple solenoid, but I am repeating myself again which I dont like to do, that is why I said if you are looking for a setup, if you want can help coming up with specific deals and parts for potential build.

[AudiSon14]

Clutch - 1z flywheel, rs4 clutch disk, diesel pressure plate, done. All you need is research that is why I said, you need to ask more for detailed setup.

Being from the states im curious of the details of this setup and how much it could hold

[2001BTA4]

lol Maybe I shouldnt have use the term "kill" yourself to make 500hp. I was just referring to that parts list above where guys are putting 10k into builds to make 400whp @ 8100rpm. Then what?. Thousands more on a stroker for acouple more hp?

I love the 1.8t b5 platform and still building 1 somewhat like how Blazius mention as Im a believer for power. but as im throwing parts at it and nights in the garage I sometime daze on the bigger picture and I dont think I could live with 450w if im doing a Build. There is different reasons to do it tho and I respect them all.

Its crazy what kids are showing up on the scene with now a days and a 10min flash via cell phone are ready to hang right there with you lol

good luck on your build. You take the route that best suites you.

[AudiSon14]

btw Im not knocking your setup at all. but im alrdy halfway in my $1500 build with used reputable parts and it pulls pretty good. Never had it on a rack but I dig out on my friends ST everytime and his car seen 281whp on a dyno. Only thing failed on me so far is my SS mani that cracked twice cause I dont run a brace but I just tig it shut till I get a cast 1 overseas.

Ima lil ballsy tho cause its not my DD and Ill send 15-20psi on a stock 058 bottom anyways, but I run it alil richer than I should and keep a eye on temps, knock and pulled timing. Everybody takes a different approach tho

[Blazius]

Thats why you dont get stainless steel manifolds, no matter what they WILL always crack its only a matter of time, a china log cast manifold with thick walls will do absolutely fine, youll be sacrificing 100-200 rpm of spool but we are talking about durability here for a daily.


Clutch setup would absolutely fine for your torque levels. hardest part for you would be sourcing the flywheel.