18 replies to this topic

[TangoAlpha]

Just done some playing around with some simulation software I have...



200bhp & 199ft/lb torque

0-60 = 4.2 seconds

[Thorney]

wassit look like with 280bhp and 290 llb's of torque

[paulb]

You're meant to use power at the wheels and not flywheel so are probably over estimating performance.

[speedyK]

For their 200bhp supercharger on the N/A, Delta-Motor claim a fairly modest, "less than 5.5 seconds"

[garyk220]

And 0-30 in 1.2 secs... what's it using? F1 slicks 1.7 - 1.8 secs to 30mph is the benchmark for production cars on treaded tyres. Adding 0.5 sec to all those figures would match the VXT official figures, more or less, which sounds about right IMO.

[Thorney]

Fi don't use slicks anymore mate /pedant

[mags993tt]

For their 200bhp supercharger on the N/A, Delta-Motor claim a fairly modest,

"less than 5.5 seconds"

Am I right in thinking that they had to work quite hard at lowering the PS level to get approval based on the Turbo's chassis homologation? If so may explain the modest performance claims.

As an aside, without changing the final drive on th N/A I imagine the acceleration figures for the supercharger would be better (though top speed obviously lower) than the turbo if they were the same power / torque roughly speaking?

[garyk220]

As an aside, without changing the final drive on th N/A I imagine the acceleration figures for the supercharger would be better (though top speed obviously lower) than the turbo if they were the same power / torque roughly speaking?

Depends on the torque curves. I think the supercharged engine has a similar shape curve to the NA - ie. climbs rapidly to a peak around 4500rpm - with a healthy increase over the stock engine from above 3000rpm. The turbo engine torque peaks around 2500rpm and is pretty flat between 2000 and 5000rpm.

0-60 and 0-100 times would be very similar if not slightly better since it's easy to keep the revs above 4500rpm, and the gearing would be shorter. In gear times at lower revs would suit the turbo engine better. All IMO of course

It looks like a great engine though. I'd certainly be getting one now if the turbo had not been produced.

Edited by garyk220, 11 February 2004 - 01:39 PM.

[garyk220]

Fi don't use slicks anymore mate /pedant

Williams fronts were last year, after 10 or 15 laps

[TangoAlpha]

Just for you Thorney...



280bhp & 290ft/lb torque

[Thorney]

mahahahahha Remember superchargers have an 5-8% mechanical loss of power as well.

[speedyK]

For their 200bhp supercharger on the N/A, Delta-Motor claim a fairly modest,

"less than 5.5 seconds"

Am I right in thinking that they had to work quite hard at lowering the PS level to get approval based on the Turbo's chassis homologation? If so may explain the modest performance claims.

Yes, they told me that they had regularly seen 210 - 212bhp, one mech said 220bhp.

They started out by claiming 195bhp and now say 200bhp. As you correctly surmise, figures above 200 would cause aggro with getting official approval – and figures below it would be not v. good from a marketing point of view.

I think that, once installed and approved, it should be possible to fairly easily "find" a few more gee-gees people are apparently seeing 220 -230bhp without much extra modding.

Ricky's lightweight will probably be hitting 230+ at around 800Kgs – would be interesting to see it in action against a mega-turbo with around 280bhp but nearly 200 kilos more

[paulb]

mahahahahha

Remember superchargers have an 5-8% mechanical loss of power as well.

But that is using flywheel power at the wheels so is over estimating. Remember that supercharger losses are already taken into account when measuring power at the wheels or flywheel - you can't double account.

That program needs some care. I got a fairly good rendition of my Audi TT but it took some playing with cdA and losses. I do not believe that Thorney's car will do 0-60 in 3.4. Nobles are about 3.8 and weight 10% more and offer another 20% more power

[Thorney]

would be interesting to see it in action against a mega-turbo with around 280bhp but nearly 200 kilos more

Actually mine weighs mine 860kg's

[Jim_Cross]

Thorney - how did you lose that much weight, apart from the wheels?

[Thorney]

Hubs, exhaust, interior (a whole 2kg's ), suspension. Most from wheels though. Need to weigh it again really.

[P11 COV]

Just think what laying off the ale and a bit of a diet would do.

Edited by P11 COV, 11 February 2004 - 10:48 PM.

[toreide]

Is this software you are using available as freeware?

[TangoAlpha]

Not sure what the license is, I found it on the internet I can send you a copy if you want, let me know.