My only question was what car were you referring to that ran 1.5 second 60fts? You said it as if to compare to the G8, so I'm curious what car and how modified it was.

That statement is incredibly general and far from true.

There are way too many variables to simply say that if you put the same turbo on a V8 and an I4 they will end up with the same power. A turbocharger that is really efficient on a 2 liter engine may not be efficient on a 5 liter engine. For any given amount of fluid (air) the pressure and cfm (fluid velocity) can only be a certain amount: as the cfm goes up, the pressure goes down and vise versa (especially if we consider the flow laminar). If you look at a flow map, you can see the efficiency of the compressor compared with the pressure and cfm. Not every engine is going to be able to create enough pressure and velocity to be efficient for every turbo. This is why you have to match your engine (and modifications) to the turbo--people often mismatch these and end up with a turbo system that isn't as efficient as it could be.

I don't really understand what you're trying to say with this statement. What do you mean if space is a limit? If the engine isn't DOHC, then I can't see space being an issue on too many V8s, and even if it is, it's not impossible to fit. But I don't really see how this is relevant.

Again, don't see the relevance since we are simply talking engines. My point was you can fit more air and fuel into a larger space (ie a larger engine); nothing to do with the car the engine is in.

 

Pretty sure 99.999999999999999999999% of the people on this forum already knew that, we are not 4 years old. This thread wasn't about will a turbo V8 make more power then a Turbo I4, it is about engine swaps into a B5 A4 which is why this forum is called the B5 Model on a Audi forum and the last time I checked there was a very limited space in our engine bay.


My A4 pulls 1.5 and it doesn't need slicks to do it. I was even doing that back when I was making 500awhp running DOT tires and over 3000 lbs. Had no problems pulling 1.6's with B6 1.8t's that are nearly 4000 lbs with me in it and those were only running Elim kits and running mid to high 12's. One of them even had huge brakes and 19" wheels.


I dont know many V8's making 400+hp per liter, but then if they were they would be pushing around 2000 hp.


BTW I said GT35r which happens to be a turbo V8 people do use. They have to run it at lower boost levels to get the same amount of air, if they try running higher boost it just acts like a chipped K03 on our 1.8 liter with the power peaking really soon and then falling on its face. I used that as example becaue the only difference between the 2 is the displacement of the motor but yet the 2 will make just about the same peak hp. It is just plain stupid to compare a GT35r 2 liter to a V8 running a GT45 since anyone in their right mind already knows if both are pushed hard the V8 is going to make enough power. Again like I said this is a forum of adults not a preschool for 4 years olds. Hell it isn't like I dont have freinds that drag race V8's that run in the 6's.

 

Eh? I guess you feel insulted for some reason, I'm simply discussing the engines and turbo efficiencies; no need to defend yourself.

 

im now havin a boost problem with my k04, its got the giac program chip, and it spools super quick and holds 15psi till like 5 grand and starts dropping boost pressure and by the time im a redline and shifting im at 10psi. i dont get it

 

Anyone that finds this thread and is wondering why the same turbo can't be matted to every engine with similar results, this site is a very good read!

http://www.turbobygarrett.com/turbob...ch_center.html

 

that's not a problem, that's the way it is. The baby k04 can't move enough air to hold 15psi to redline.

 

Back the train up, LS2??? I just happen to have access to that very motor. Is there info or anyone else whose done so?

 

Bye bye Quattro.

 

as in, it wont work, or do you mean it wont handle the power?


search Guruman on audizine... He's doing the swap now. You can get an adapter plate to bolt the LSx to the 01E transmission. It should hold up to the power.

 

old school



LS1 going into B5



Now thank you, I am watching that thread very closely, that would be a fun project.