barrie

hi,

considering driving down to wett for a chip on friday. here's my lack of comprehension:

chip leads to increased horsepower...
1. is power increased at low rpm's?
2. is power increased before the turbo kicks in? OR is the power increased solely through the turbo kicking in?

what i want is more pickup from 0-40 - will a chip give me this, and if so, is horsepower increased solely through the turbo?

i don't care about going 150mph, i care about more pickup at low speeds. i know this sounds like an impossibility, but what would be perfect would be power at low ranges without working the engine harder - what a dreamer, right?

barrie

Chard

i've got an apr chip...

i noticed the power increase all over. i think it is solely due to the increase of the pressure in the turbo. instead of running around the stock 7psi, i now have about 14psi. this is a 1bar chip, the same as the wett i think. so as you can see, the turbo output is doubled. you'll feel the difference immediately after putting in the chip. i was hesitant at first, but i pulled through and am not regretting it a single second...and i think that this has been the best investment in mny car so far. hope this helps! (btw: you'll definitely see power increases from the 0-40 range...the 0-60 for my car should be about 6.6 or so now)<p>Chard
99.5 1.8tqms Silver, APR, clear corner mod, exhaust mod, some stereo stuff...

myke050

<p><a href="http://registry.audiworld.com/audi/registry/details.asp?car=4681"><IMG SRC="http://members.aol.com/lechterbub/sigfile.JPG" border="0"></a>

RangeR BoB

Barrie:

Put simply, the turbo forces more air into the engine than it would draw in purely with its moving pistons. This allows the engine to burn more fuel, thus make more power. When the engine is loafing along the turbo makes no boost, and the engine will draw a vacuum, just like a normally aspirated engine.


From the factory, the 1.8T makes about 6psi of boost, whih is fairly modest. The small turbo and restrictive exhaust manifold allow the turbo to make that boost from around 2,000 revs to near the redline quite easily. Accellerate in say second or third gear from 1,000 revs and you will notice the turbo wake up as the tachomoter reads around 2000 revs.

Physics dictates that a turbo needs a certain amount of exhaust gas flow to make it spin, so no matter what you do, there is a point in the rev range below which the turbo won't be effective. Thus the 2,000 rev lower limit in our cars. Keep the revs above 2,000, and the car is quite drivable.

As far as chipping goes, the 2,000 rpm limit is still there, but the new chip allows the turbo to make more boost (and thus more air flow, thus more power) than from stock. The benefit of this is very noticable, with the APR chip (for example) claiming 225 lb-ft of torque from 1850-4500 revs (rather than the fatory 155) This is very noticable, and is easy to feel I drove mine with a stock computer after I had installed the chip, and the effect was dramatic.

I think a chip is a definite improvement in drivability. the APR v3.0 I have is even smoother around idle, and as I engage the clutch, than the fatory chip. I think it makes for a definite improvement around town driving, not just at high speeds.

HTH,<p>99.5 1.8Tqms Laser Red
97 Jetta ]I[ 2.0 GL Gold
88 ZX-10 Red/Black

Bryce

<p>Bryce
'00 1.8T Avant-Tip...APR

Rodney

Most chips increase power across the entire range, though the most significant gains are made between 2500-5500 rpm (with some variations from chip to chip). There is a bit more power with some chips (MTM) before the turbo kicks in, but not much (see the FAQ for why gains are minimal when the engine is acting like a normally aspirated engine).<p>Regards,
Rodney

'99 A4 1.8tqms<ul><li><a href="https://www.audiworld.com/faq/faq_engine/000430.shtml">Intro to chipping FAQ</a></li></ul>

Hydra

yup myke050, i live near you too, i'd give you a test drive sometime if you want