PSH said:
Hi Roger...your car sounds like a fun machine to drive although there's more to performance than the power to weight ratio...yes it helps off the line and I bet it would be very quick around a track .. the Turbo is a different beast...it's relatively slow off the mark but at mid range it's a true champ even in standard form. It has very long legs and even with a basic tune won't loose acceleration until it hits the redline in all gears.. I followed these cars on the race circuit for a number of years until they were finally banned from the Porsche Pirelli/Michelin cup championships as they just kept winning against Porsche's latest models, final straw being when they even beat the then new GT3's and we are talking standard engine output here...just imagine then what a well sorted 951 is capable off.....
Good luck with your lightweight....hope to see it and you at one of the meets some day...
cheers
Pete
Yes Thanks Pete,
"they even beat the then new GT3's and we are talking standard engine output here."
This sounds bizarre, I can't understand how a standard power (220 / 250) 944 race cars can beating a GT3 Race car unless the
driver talent was very different ?
Here's a good clip off Youtube, both Racecars and the 944 is not standard power and the driver's lines are poor and he is slower.
eventually the GT3 gets past..
https://www.youtube.com/watch?v=bS54sGBr01I
There are several keywords I can see and pick up in your reply which is exactly why I decided to modify the lighter from standard and narrower 944 (The 924) and then lighten further (by 250kg) and install a large 2.7 Litre normally aspirated big four with 8 valves.
It would of been much easier & cheaper to of installed a turbo or 968 motor, but there's no fun in that and besides I always
prefer to be the underdog (David) and not Goliath! even more so as the 924 has the "Van engine" and "Poor Man's Porsche" labels!
I've owned 8 Transaxles (So far) including the 3.0 968 and I've also driven 3.0 S2's and 944 turbos, firstly so many of the same models differ in performance which I think is often down to use....... or lack of it!
Turbocharged car's are always a Hoot when that Boost comes in, however they can be annoying
when they don't do "what i want" (Go, due to lag) when i want and vice versa! which is why you often hear and read the 3.0 S2 944 is a far better ROAD car than any 944 turbo due to the effortless instant torque on tap and easier driveability.
I'd like to compare on the ROAD a long legged (FDR 3.375) laggy and heavy 944 turbo (1500kg+ with driver) in comparison to my shorter geared (3.889) 400kg+ less (with driver) car which it's freshly built and USA tuned high compression (10:9:1) 2.7 Engine, the 20 piston braking system and Wavetrac LSd etc..etc...I'm fairly convinced it would be the quicker car Road car. (Not just a straight line test)
When you say
"there's more to performance than the power to weight ratio...yes it helps off the line"
I disagree , it's not something that just "Helps", it's a huge thing not just beneficial off the line, it's midrange, top end and everywhere.
When I press the loud pedal the car moves with keen vigour due to the (20%) less mass and the (37%) extra torque it has.
I often switch off the engine, get out and push my car in and out a single garage on my own!
The total Increase in the Power to weight figure is approx a 60% compared to it's original weight & the 2.5 engine
which is a fair increase!
It would be like driving a Boxster 3.4 (300bhp) and then jumping in a 3.8 (480bhp) GT3 that's how much different and better the figures not only register on paper but also in reality on the public roads now I've done 1600 miles in it over the last 2 months.
Sure, Power to weight is not always the 100% story but you only have to look at the ultimate laptimes on Magazines and Motoring TV programmes to see often the quickest machinery is either a lightweight Caterham or Ariel Atom etc...and not a 900bhp twin turbo Italian supercar..
The Race track is a total different bag to the Road, talking of magazines again they often refer when testing a McLaren or lambo etc..on twisty B roads that a cheeky little hatch is as quick if not quicker than these Supercars which have 3 to 4 times more power....Unyet on a Track they would Blitz the Hatch.
So i understand any 944 turbo Race modified car is very quick on a track, but a standard one I not only think would be no quicker but actually slower than my 924S on the Road.
I'm not interested or have built this car for the track (It's all Rubber Bushed) I'm only interested in Road use and this is why I believe from my Racing and Motorsport tuning experience a light, compliant and low down torquey car would and is a real tool.
You mention the
"the Turbo is a different beast" and
"it hits the redline in all gears.." this is exactly what my car does not NEED to do as it's like riding a big Sports bike, you can pull away from the lights and junctions with ease and it leaves a lot of car's for dead, I often short shift at 3000rpm because there's no need to go any higher unless there's an M3 up my chuff! Then i'll go to 5500rpm but not much more as the peak power is 5799rpm, and peak torque is 4500rpm
It has a lightweight Knife edged 951 crank, aluminium flywheel and lighter (968) rods and Wossner forged pistons which all equate and total 9kg less revolving weight (than a stock setup) which doesn;t give it more power but means it accelerates quicker from point A to B. The downside is the loss of inertia so it decelerates quicker when you lift off the throttle...
The 250bhp 944 Turbo factory figures (which are often quite a bit less when Dyno'd on 25+ year old cars)
are not that far different (10 - 25%) Considering it has a blower:
2000rpm (924 = 164) v (944T = 180) ft lbs +10%
2500rpm (924 = 180) v (944T = 213) ft lbs + 18%
3000rpm (924 = 190) v (944T = 238) ft Lbs + 25%
4500rpm (924 = 205) v (944T = 254) ft lbs + 24%
6000rpm (924 = 179) v (944T = 202) ft lbs + 13%
Add on top my 400+kg less mass and you can see why I'm keen to find a 944 & even 968 Owner? and do a shoot out
on the road and also the track even with my soft Road suspension set up, and skinny 205mm tyres ....
911& PW are ready to feature my car, I'm sure I could convince them do a feature on a 944T & 968? v a 924 modified n/a comparison..
Any takers?
R