best engine for high power/weight ratio? AKA Ben's Cab

Still got to find another 50% more power.

Sometimes more boost means less power if you cant get the airflow. I would think these quoted horsepower figures are as a result of massive boost which will heat up the turbo in seconds and result in far less power in reallity.

 

vr6 turbo

You sem to be the expert on vr6 turbos
Ive only built one !
My car has a GT3076R running 1.3bar its not even trying mate !

 

yes i believe ian carvell knows bugger all about engines or anything for that matter

 

pmsl

"Ian Carvell" try searching for that on the net

 

I dont know anything about turbo charged VR6 engines....and I hope you dont think I am attacking you, because I know how these posts can sound impersonal.

However, I do work as a Engine Design Engineer and I have worked on a Supercharged 4.2L V8 engine, and I know how difficult it is to get 450bhp, and its the last few bhp that are the most difficult.

As I said..more boost doesn't always give more power...it will to a point, and then you get caught out by thermo dynamics.

I am sure if you ring the company you were talking about and asked them for 750bhp they definitely wouldn't use the word "easy".

 

& with more power comes unreliability under heavy conditions.

You have to find a compromise between all out power & grip as some cars with half the power spoken about but with quicker times.

Look at the mad Norris Designs demo Evo at rally action, masses of power but not masses of grip = on the grass more than the track.

What was this 7-800bhp? & god knows how much money????

http://smg.photobucket.com/albums/v90/fthaimike/Rally%20Action%20Day%202006%20Castle%20Combe/?action=view&current=DCP_5751s.jpg
http://smg.photobucket.com/albums/v90/fthaimike/Rally%20Action%20Day%202006%20Castle%20Combe/?action=view&current=DCP_5752s.jpg
http://smg.photobucket.com/albums/v90/fthaimike/Rally%20Action%20Day%202006%20Castle%20Combe/?action=view&current=DCP_5753s.jpg

 

vr6 turbo

Its not down to engine design its down to big turbos and good soft ware !
I know the numbers dont add up but i have seen a 1.3 busa engine do 500whp and the only mods where rods and pistons and a turbo . Big cc have had 725whp out of a 1.6 busa ! The person who dyno'd my car has a honda civic thats 780bhp but they are run on 125+ron fuel ! 700whp has been done and i have heard of stock engines with only big valve heads doing 600whp and a vr6 engine is a crap design !

 

i'm skint i was talking hypothetically. one day though

 

and i was asking about the best power/weight ratio. is'nt a VR6 heavy?

just to add fuel to the fire...
wasn't the old quattro s1 giving 600BHP from 2.1 litres in the 80s?
(and if anyone wants to swap one for an 8v let me know)

 

defo when you pick it up, so is a 20v engine

as always its how its set up

 

Thats encouaging then, I wish you luck with the VR6 Turbo...

I wonder why we dont see any of these phenominally high power to weight ratio engines in motorsport....you would think they would be perfect for that.

 

bike turbo engines rev to something nutty like 18k rpm, still don't see how you are getting 450+bhp per litre from a bike engine.

I also can't see anyone is getting a sustainable 500+bhp out of any stock VW bottom end......unless you have a dustpan and brush for your conrods.
even the latest incornation of there 4 pot block is limited by the rods.

Anyway, though this was power to weight ratio post.
Always thought that nutty blue Mk1 with N/A 20v was a very nice set up.

There are lots of US chaps running similar figures to Bill's Ibiza, not to many broken 500bhp with a 1.8/2.0/2.1l -"1.8t" though as far as I know.

The Dialynx Sport Quattro was up to 900bhp out of a 2.3 if I recall, they have set up a number of hill climb sport quattros that are north of 600bhp , have a Audi driver article about a rolling road day somewhere.

what about that Jun engined skyline, that was 1100bhp I think, lots of Supras and skylines cracked 4 figures

 

actually the dialynx sport quattro was only 550 hp but incredibly well set up, others were tuned for 600 hp and more as you said though

 

Another vote for the 20VT here, bored and with a huge turbo! The VR6 is just too heavy

 

& the 5 pots had a tendancy to blow rods.

 

vr6

Thanks !
Take a look at schimmel performance and the vw jetta they have done
700whp plus monster 9.5second quarter and its front wheel drive numbers speak for them selfs

 

If you dont mind me asking how much was the total cost for it inc setup?

 

Isn't James doing 10.3 sec 1/4 with 400bhp FWD?

You sort your boost out then and bring it to a trackday...you will see what I mean.

 

Nope, this is old but it was up to around 900 at one point. my recollection was of 900 but it appears in this article it is 900cc injectors (5 of) and 3.1 Bar of boost.
You don't get 2.5 sec 0-60mph times out of 550bhp in a car as heavy as that
I wouldn;t be tuning my customers cars higher than my own either

 

I rebuilt my engine nothing fancy just rings shells oil pump cam chain kit and turbo'd the car for just over 3000 and thats including motor mounts, exhaust, fuel pump,boost controller and it should do 500bhp with big torque not bad hey !