Motors getting more power out of my rabbit

Yep, I think mine hits 60 or 70krpm

I'm not sure what electric superchargers you've been looking at, but the ones I've seen are pretty much just a case fan in a tube which will do absolutely nothing. For any gains, you'd need to draw roughly as much power as a belt-driven supercharger would pull from the engine depending on it's efficiency.

LPG injection would probably be a better bet

 

while this is true, pretty much anything over 750cc will produce enough exhaust gases to spin the smallest turbos (t25, 14b, or smaller)

superchargers unfortunately draw power from the engine in order to function, and aren't nearly as effective on a small displacement diesel engine, as on say a large displacement gas engine.

simply put, small displacements, turbos provide more net power, large displacements, it's a toss up.

Turboing a car is not a task taken lightly.

Besides needing the basic parts (turbo, manifold, wastegate, downpipe, blow off valve, misc piping, oil lines), there's a large number of things i'd recommend or suggest (intercooler & piping, wideband o2 sensor, vacuum manifold, vac/boost gauge, oil pressure gauge, exhaust air temp gauge, forged internals including low compression pistons, block sleeves, rods, crank balancing, new head gasket, forged headstuds, upgraded fuel pump, upgraded fuel rail, faster flowing injectors)... and there's one thing you definitely need, which is a properly tuned computer.. also to that list is a beefier ignition system, and a lot of time...

while not in boost, a turbo will aid in better fuel economy, but i wouldn't expect much more from a diesel, on a gas car, it can be as much as 15%, but comes at the cost of driving like a grandmother depending on the size of the turbo

 

I would have just tossed down the cash for an AW11 MR2. The 4A-GE engine is, to me, the best-engineered engine of all time: excellent fuel economy by today's standards (20 years later), simple design, lightweight, powerful, durable, very high-revving, and best of all, fundamentally zero-maintenance.

I'm a turbo kind of guy (for any application), but for the sake of ease of installation and budget, I just recommended the supercharger.

 

while the concept to most seems easier (installing a supercharger) having installed numerous turbos and superchargers, the turbos are fundamentally easier to install, and are less prone to failure as a result of improper installation

 

yours spins slower because my turbo is very small
I believe it is a GT-25 hybrid(as in the airside impellor is not the GT-25 one)
it is used on a 1300cc engine

 

Mine is smaller, 660cc beastie

 

I've heard of the porsche syndrome on forums like "My dad is can beat up your dad" or "look at the size of my cock which is a magnitude of 250 bigger than your 2 peas and dwarf peruvian carrot"
but we're going the opposite way boasting we have a smaller turbo ?

 

Something like that yeah We obviously have nothing to compensate for

(except for my tiny penis)

 

Unfortunately NiHiLiST's car was hit with the Honey-I-Shrunk-The-Kids ray, before-hand it was about the same size as an SL500... Now it's about the size of a napkin.

 

Old thread, Rwise from your gwave!

While reading about superchargers on howstuffworks.com, I noticed something peculiar. The page about centrifugal supercharges says that they are the most efficient of all forced induction systems. That implies that they are even more efficient than turbos. Is that true? And if it is, would you recommend one of those for a small diesel?

 

I'm sure they are the most efficient, but that doesn't mean they're well-suited to a certain engine - don't forget that they take a chunk of power to run, and you generally need an engine with reasonable power to get them going.

 

the 4a-ge is naturally aspirated, its the 4a-gze thats supercharged, and you're right every variation of the 4ag is a cracking engine, decent fuel econmy and blinding performance for the displacement

electric superchargers = waste of time, also if turboing, dont forget to lower the compression ratio, headbolts and gaskets will only take so much compression

 

How do you lower the compression ratio?

 

Superchargers delive very eficient power for small displacement engines because it delivers instant power, at least this was true in the past where engines were lazy and were hard pressed to reach 4500rpm. Now small displacment engines can go into the 10k rpm range and large displacement engines can do 7k+ from factory.

Superchargers are eficient at producing power because power is instant and for the most part constant, efectively making a small displacement engine act like a large displacement one. Turbochargers are another beast where tuning can become tricky depending on the engine.

There are supercharged engines that are diesel as well.

I would go for a turbocharger however, but be ready to tune more than supercharged engines. Its a fine art that can be very rewarding providing esentialy the best of both worlds where performance is not sacrificed for fuel economy.


As for lowering compression, there are several methods, thicker copper gaskets will reduce compression a bit as well as shaving the pistons. The best route would be to buy forged pistons that are built for lower compression ratio. Even in diesels where compression ratios are way higher they reduce the compression for forced induction. For example, a non turbocharged duramax diesel is somewhere north of 18:1 vs a turbocharged version where the ratio is around 13.5:1.

Personally, I would not bother turbocharging the old vw diesel as it can be a fragile engine and even naturally aspirated it has issues with seals in the head, the machining process is not as exact as it should be.

good luck in whatever you decide to do however.

 

I just bought a rabbit! Here's the ebay page. It needs a new exhaust system, so I figured I'll go to the junk yard and get some parts from a car/truck with a bigger engine because a higher flow pipe/muffler/catalytic converter means less resistance and more power. What kind of increase am I looking at here? I also got an idea to get a bigger air filter for the same reason. Would that make much of a difference?

 

Negligible difference for both. Maybe just about noticeable with both done.

 

I was sure, when I read this, it was something to do with a vibrator.

 

Agreed.

However, i was pleased at the mention of the 4A-GE. that engine, according to a friend of mine, is legendary.

 

if i were you with that mk1 golf mate, id just put a 1.9 tdi lump in there, its relatively simple and then you have turbo economy with huge amounts of power and torque (especially with a chipped ecu)

electric superchargers are a bit of a myth, they do sweet **** all!

get on vw-vortex forums, edition38 or vwmk1owners forum and they will sort you out...

i just sold one on my gtis today so im down to only one mk1 golf now