Members Page/Marcell Gal/Power And Traction

MembersPage/MarcellGal/PowerAndTraction (2007-04-04 08:38:38)

Having seen MembersPage/NanassyPeter/CloneInstall it became apparent that it's possible to make something for appr. 8000 EUR that leaves most Ferraris, BMWs and factory Subarus behind (in normal road circumstances or even during drag-races).

[pictures about the engine pieces]

note that almost_factory_k26_26/ folder contains pictures about and installed almost factory K26-26 setup. That is NOT mine (the main coolant radiator is in front, not at the left side).
look at [1]
- looks nice, no cracks at the sparkplugs
- from pic0012 and pic0013, can you confirm this is the turbo head ? The holes for the extra-coolant manifold under the intake valves confirm this, right ?
- for now, the normal camshaft will stay (not changing to 7A)
do you notice anything noteworthy ?

We accept that the max power of this engine will be limited by the following parts:

K26/27 turbo, especially with the #6 turbine housing
- though K26/8 housing might be tried later
the factory exhaust manifold
- though nicer manifold is not ruled out
the factory charge cooler
- this will be changed later
maybe pistons as well
- Pistons are fine for 500++ hp but rods are maxed out after 500 Nm, they can take even more beating if bearings are ok and there is no detonation
- and JE pistons and Eagle-H-profile rods are clearly overengineered: much stronger than needed for K26-27 turbo. But the package cost was reasonable (high-specs engine with head under 3000 EUR - without turbo and exhaust manifold)

Effectively, max power (on the crank) that can ideally be achieved with this setup is estimated max 380 .. 400 HP.

We don't want to stress it further because:

many parts (at least the ones in above list) should be upgraded to get even just +50 HP
- this would delay the project and draw attention from our main focus: to get the electronic, firmware, config and docs part completed
380 HP is already dangerous enough
we want a streetable car. This means we want boost at around 3000 .. 3500 RPM, and we don't want to sacrifice reliability for further performance

K26-6 turbine housing (cm scale):

Engine specs

JE pistons
- CR ???
eagle H-rods
Gotz sputzen bearings
metal head-gasket
factory intake manifold
exhaust manifold for K26/6: under investigation (using the factory manifold if a new proper manifold does not arrive)

As you see, this is inhomogeneus. Sounds stupid to use those pistons and rods (good for 600..900 HP) when the turbo limits power to appr 400 HP. However, we had a short timeframe and limited supply. So we chose a built (by experienced parties) bargain engine for appr 2500 EUR instead of a used "junkyard-engine" for 1600 EUR (though that had more spare parts). This way we can reduce the risk of wasting (more!) time because of mechanical problems. And possibly have some room for more HP for future upgrades.

The 20VT (5 cyl, 20 valve turbo) engine is quite amazing

intake and block are very good (intake allows >400 HP if other parts do support the air), with good supply of aftermarket pistons and rods if one wants more
factory turbo is restrictive unless one settles for 250..270 HP
factory (casted) exhaust manifold is a joke. Noone knows the real performance, probably it gets restrictive above 350 HP, and makes airflow differ in the cylinders. Most tuners will install a new exhaust manifold (with a bigger turbo of course)
- though some say even the factory exhaust manifold works well up to 400 Hp. It's hard to tell the flow difference between cylinders.
the drivetrain (gearbox, differentials and other pieces) of the audis that came with this engine is very durable, this makes it a low-budget option to make a high performance car
- though they understeer, which can be helped somewhat with right suspension, but some understeer will remain.
and last, but not least, leaves enough room in the engine bay for extras, and maintenance

We purchased a

street-legal Audi 200 quattro turbo (paper says 1400 kg without driver and fuel: a bit heavy, but not insanely)
with (known broken, see pics below) 3B (20V 5 cyl turbo) engine (and harness)
- though 3B harness is different than AAN harness, all the main points are the same. The small wiring differences, including 1 or 5 ignition outputs are very easy to apply
- After a few unfortunate events (like after a negotiated deal for an engine we would have purchased, the guy finally decided he keeps the engine), the new engine is scheduled to arrive on 2007-04-05. I'm very excited about it. However
  - if I understand right, it is the engine with 5 COPs (AAN), not the distributor head. This means we need a few more wires and ignition transformers. Or, maybe we use a bigharness (or make a custom harness?). Even if we use ECxx connectors on this, perfectly suitable for testing everything. The mapping to motronic-55 (for either 3B or AAN type of loom one might have) is trivial. A guy who purchases the PNP asked that we test the PNP setup on his AAN harness.
  - no firm deadline has been established yet for the engine mechanical installation (oil, coolant, charge cooler, generator, AC compressor)
  - but we will have 3 or 4 audi 5cyl 20VT engine installs in Hungary just in the first half of April in any case.

We understand the potential in these engines and want to support tuners around the world who chose this engine.

The most important target of this install is to get the InputTrigger/AudiTrigger install procedure as simple, painless and reproducible as possible

doc improvements
v3.x assembled with 55pin motronic for PNP install (reusing the MAF and NBO2 wires for the WBO2), possibly min 2..3 versions:
- 1 coil harness
- 5 coil harness
- TODO: evaluate the other 55pin pinouts out there
- not sure if the K-jet harness is easy to support at all
perhaps with firmware and logging mods / suggestions, to help finding and fixing trigger issues

Near-future plans with this install

20VT - 5 cyl 4 valve, turbo
4WD - leave as is ;-)
leave factory intake for now
- DROPPED idea of highend intake: after the throttle, the ends of 5 pipes arranged in a circle around a cone, in the firing order of course (tube from charge cooler to throttle might need to go around the radiator, not a big problem)
- CHOSEN: factory intake is good enough for us
get a working bottom-end (the block in the car we purchased was broken). This should be hammered before 2007-03-15
engine management VEMS

K26-6/27 turbo, the K27 compressor looks like (cm scale):

Exhaust and turbo - advice accepted, I have no experience here

We missed a nice looking 500 EUR exhaust manifold (auctioned 2007-03-29 on ebay.de)

A friend purchased [187 USD RS2 exhaust manifold] from [ebay]

it's actually 187 + 100 USD with shipping to Eastern EU
as you might expect, the weldings look good outside, not so perfect inside. But not very bad either
friend will try to stick (bigger than K26/27) turbo on his manifold, without extra strengthening (for street use). I think that is a bad idea, the exhaust manifold will crack (sooner than later) due to heat and vibration.
- I would definitely strengthen: connecting to near engine-mountpoint (seems best: turbo is very close to engine mountpoint in the audi, 8..10cm: only watch some clearance for securing screws). Connecting to head is another option: but that is further away, seems suboptimal.

we want to complete the install ASAP
- the factory turbo can do 220 HP in factory install, max 250 .. 270 HP with raised boost. Apparently we currently don't have such turbo (what is the type anyway?)
- the new engine we purchase has K24, Maybe 270 HP or so
- it seems the (broken-block) engine we purchased the car with had K26 (NOT the factory turbo). Maybe 360 HP or so
- CHOSEN: since compressor blades seem to be "sanded" (as if it was driven without air-filter), while renewing, Turbo compressor side upgraded to K26/27 (appr 6xx EUR). Good for max appr 400HP. Minor compromise is that it is now an oil-only turbo (=> no watercooling: if I understand right, keeping watercooling would require some overpriced factory parts that just aint worth it).

The K26 turbo was upgraded by http://www.ahturbo.hu/ with instructions:

to upgrade compressor side to K27 with rotor sizes 53mm/76mm
- turbine wheel dia=56mm, compressor dia=53mm (would be useless with turbine smaller than compressor).
- turbine outlet is 56mm diameter (the 6 in KKK numbering scheme). It's the clone of a proven setup (that worked well in an engine built by them earlier). Perfect for the street.
turbine renewed (but housing kept)
oil-only accepted (loss of water-cooling)

Kalske says: Remember that RS2 turbo is 48/54 which is good for about 360, you are getting 53/55 which will do 400++
- Nanassy said exactly the same !
Kalske and jhwh say: the same turbine wheel goes into 3 different A/R housing, marked (in KKK numbering) 6,8 and 10. Higher nr gives more power (appr 45 HP each step), but boosts later (3000, 3500 and 4000 RPM, respectively).
- so turbine housing="8" is the best choice for this turbo. Stay away from 10. 6 is not optimal, but works. (and 6 might match the restricted exhaust manifold and factory charge-cooler and street-operation better than the other turbine housings)
- you should look for a cheap #8 house. On [ http://forums.rennlist.com/rennforums/forumdisplay.php?s=&forumid=72 rennlist] you can probably get a 8 housing next to free as many people upgrade
- if you come over a good deal on one it should only be a minor mod, remove turbo, remove housing, bolt back on
AFAIK KKK uses cm2 rating on turbines instead of A/R (on Garretts, and so on...). I guesstimate the 8cm2 turbine will provide a quick spool-up (maybe in the 2200-2800 rpm range on a 2.2l engine), which means big fun on street, and some restriction in the top-end power. -GergelyLezsak-

Later

bigger injectors will be necessary to utilize the bigger turbo
- maybe higher pressure FPR (or FPR springs?)
possibly water injection

You can find some pictures under [files], including

old engine with cyl1 wall knocked out by rod; cyl1 rod shrinked 10mm !!

Links

[Audi 200 specs]
- this engine does not seem to have cruisecontrol capability (huge "idle-valve" or throttle actuator)
[Repair manual] - awesome resource
http://en.wikipedia.org/wiki/Audi_100
[ self-documentation wiki] original selbst-doku.de is German, and the English is just a babelfish auto-translation (not recommended to edit the English)