straight line race: ahu jetta tdi vs alh jetta tdi?

[85_305]

Odd question, I know, but I'm very curious to know what a good 500lbs less that the 98 ahu jetta is carrying around can do when compared to the same motor with the same power in a car 500lbs, give or take, heavier. Any experience or input?

I know that every hundred lbs is equivalent to 10hp, or .10 of a second in a drag race. Using that basis, it seems that stock vs stock the older mkIII jetta should eat up the heavier mkiv jetta.

Opinions and input?

[Glegor]

the ALH should go better because of the VNT.. the powerband is much nicer with the VNT.

[Glegor]

better yet... who cares?

this is another POINTLESS question..

[Glegor]

how long is a piece of string?

[Glegor]

brings back memories of THIS THREAD

[85_305]

the ALH should go better because of the VNT.. the powerband is much nicer with the VNT.

While the vnt is quite great, I dont think that a simple mechanism in a car 500lbs+ heavier is going to equalize the playing field...

[fastinradford]

While the vnt is quite great, I dont think that a simple mechanism in a car 500lbs+ heavier is going to equalize the playing field...

obviously this guy has never driven a car with an upgraded turbo, aka 'simple mechanism'


yankin your chain man

[85_305]

So what do you think? The ahu vs the alh an equal straight-line battle? Or does the 500lbs lighter mkiii win?

[fastinradford]

ahu wins low down, alh wins above 80mph when the k03 is choking down and the vnt is flowing buttloads of air.

[85_305]

Ah that makes sense... The kkk is TINY!

[Glegor]

Ah that makes sense... The kkk is TINY!

anything over 3500, maybe 4000 rpms is just making the turbo a restriction..

i would rip the AHU out of the mk3, find a REALLY CLEAN mk2 GTI, or Jetta Coupe, and put a mechanical pump (or a full electronic swap if its a CE2 car) on the engine, a big turbo, and call it good..

then it will be FAST, and handle BETTER THAN the mk3 or bloated mk4..

plus, you can do nose wheelies with good brakes on a mk2..

[85_305]

What exactly is so bad, particularly, about the kkk? The dinky compressor?

[trips_b]

Nose wheelies!? Are you serious

[fastinradford]

anything over 3500, maybe 4000 rpms is just making the turbo a restriction..

i would rip the AHU out of the mk3, find a REALLY CLEAN mk2 GTI, or Jetta Coupe, and put a mechanical pump (or a full electronic swap if its a CE2 car) on the engine, a big turbo, and call it good..

then it will be FAST, and handle BETTER THAN the mk3 or bloated mk4..

plus, you can do nose wheelies with good brakes on a mk2..

Did this with a friend of mine to his 90 jetta coupe. 2.5" exhaust, fmic, nozzles, still on stock tune with timing and iq fine tuned. Running 15psi. Full electronic dbw. Made 62mpg highway and around 15sec 1/4 mile.

Great car, and reliable too, with almost all oem parts! Still uses mk2 cluster and full votex/recarro trophy interior. Nice ride to say the least.

[fastinradford]

What exactly is so bad, particularly, about the kkk? The dinky compressor?

It is small to reduce lag, and in turn, becomes a restriction at high flow situations aka high rpm.

Ahu with k24 on it is where it's at. May not be the fastest possible, but a monster all the same.

[85_305]

Did this with a friend of mine to his 90 jetta coupe. 2.5" exhaust, fmic, nozzles, still on stock tune with timing and iq fine tuned. Running 15psi. Full electronic dbw. Made 62mpg highway and around 15sec 1/4 mile.

Great car, and reliable too, with almost all oem parts! Still uses mk2 cluster and full votex/recarro trophy interior. Nice ride to say the least.

Whoa!!! Thats sweet!!!!! I'd be down for something like that hehe

It is small to reduce lag, and in turn, becomes a restriction at high flow situations aka high rpm.

Ahu with k24 on it is where it's at. May not be the fastest possible, but a monster all the same.

So basically since the compressor is so tiny, it just runs out of wind up top? EGT's aren't bad on ahu's with kkk's?

[fastinradford]

k03 makes boost rapidly, so it keeps egts pretty low actually, but it is a restriction.

What I find, is that egt goes up with a laggy turbo, k24 runs higher egt than k14 for exaple, with both maxed out.

the ahu/k03 in the coupe would be around 475f (egt) on the highway at 60, but was running max boost or damn near

max egt with stock tune was closer to 900f, but tdis run a lot cooler.

[85_305]

Interesting. So an ahu/kkk can handle higher amounts of boost than stock?

[Glegor]

Interesting. So an ahu/kkk can handle higher amounts of boost than stock?

uh, where did you get it in your head that the TINY K03 will make more boost than factory set?

it MIGHT, but its not gonna last for crap..

that VNT is where its at, turbo wise.

[85_305]

I'm gonna make it work. I've got a plan for this little turbo. Just wait

[Glegor]

I'm gonna make it work. I've got a plan for this little turbo. Just wait

if you ask too much of the K03, its gonna break the turbine shaft, and cause your engine to run away..

i would not even attempt to tune for much more power until you get a BETTER turbo..

please keep the VNT on the ALH tho.. the VNT will be GAY on the AHU with no way to control it..

if your gonna do something like that, buy a K24 or T3 turbo off a 1.6TD, and strap that on..

[85_305]

Accordsing to jeff at RC these turbos can handle stage III tuning, 18-19psi, just fine. But no I won't be putting a vnt onto the car. Too much bs and work. I'm not going crazy with this car, just a few healthy mods.

[Glegor]

Accordsing to jeff at RC these turbos can handle stage III tuning, 18-19psi, just fine. But no I won't be putting a vnt onto the car. Too much bs and work. I'm not going crazy with this car, just a few healthy mods.

dude, ill say it again.. and put it in CAPS..

THAT K03 IS JUST A BAD RESTRICTION ABOVE 3500 RPMs OR SO. restrictions are not good for power..

that turbo is just too small for performance.. sure, its an insta-spooler, but it runs out of breath WAY BEFORE the engine does..

if you run that K03 @ 18psi, it wont last long at all! promise..

find yourself a K24/T3 and manifold, swap it on, and be done.. then it will RAIL, and you wont have to worry about your turbo exploding..

[85_305]

Where do I find that setup? Is it a bolt-on turbo?