ultima gtr 640&720 only 231mph ?

[gargoyle]

how come they both have the same top speed ? is it because of the G50 five/six speed box ?

[andygtt]

Not aware of any ever going that fast anyhow so only a theoretical top speed based on gearing.

[gargoyle]

ok, whats meant by limited by gearing ?

[LuckyP]

gargoyle said:

ok, whats meant by limited by gearing ?

With the std boxes that we use, you are 'limited by gearing' to around 180 at 7000 rpm. If you choose to go faster, you need to mess with ratios or final drive......or have a motor that can rev higher.

[GTRCLIVE]

My Stock G50/20 could get me to 200mph at 7200rpm, but never had the room to do it.....

[Wilder]

Indeed as Peter said, the standard ratios on a G50/20 I think are 187mph @ 7000rpm.
You can either go for a GT2 box, or change the ratios in the box to obtain higher speed.
mine (in theory) is geared for approx 240mph @ 7000rpm - it pulls 34.2miles per thousand rpm.

[GTRCLIVE]

No I had a Bone stock G50-20, no mods at all.. and had 29 mph/1000 rpm in 6th gear... 26.1" rear tyres same as normal 335x30x18 rears..... ah but It was a 4WD box though maybe that was the difference...

[Wilder]

The 187mph was according to powerhaus chart I got in the USA, so it seems that theres some variation as a fwew people seem to have varying top end theoreticals.

[Steve_D]

My chart gives 29.6mph/1000 for the G50/20.

Steve

[LuckyP]

Steve_D said:

My chart gives 29.6mph/1000 for the G50/20.

Steve

What does it give for the G50 03, Steve? Is it 25 summink?

[Steve_D]

LuckyP said:

Steve_D said:

My chart gives 29.6mph/1000 for the G50/20.

Steve

What does it give for the G50 03, Steve? Is it 25 summink?

25.8

Steve

[LuckyP]

Steve_D said:

LuckyP said:

Steve_D said:

My chart gives 29.6mph/1000 for the G50/20.

Steve

What does it give for the G50 03, Steve? Is it 25 summink?

25.8

Steve

180.6mph @7000rpm......Hmmpphh!!

[Captain Slog]

Lucky, is yours on a rev limiter? if so you only need to tweak another 752 (ish) revs for your 200

Steve

[LuckyP]

Captain Slog said:

Lucky, is yours on a rev limiter? if so you only need to tweak another 752 (ish) revs for your 200

Steve

Don't tempt me!! I'll take it as high as the builder will allow. He's coming with me to the next Vmax so we'll see what he'll allow!

[LuckyP]

The other alternative would be to shod a spare set of rims in deeper rubber - I think I have clearance at the rear.

Anyone care to suggest a make, model and size?

[LuckyP]

Inflated Kunhos dia 655mm
Inflated Toyos dia 660.4mm

Goodyears?

[Steve_D]

LuckyP said:

Inflated Kunhos dia 655mm
Inflated Toyos dia 660.4mm

Goodyears?

658mm

Steve

[Captain Slog]

This should get you there Pete.




Steve

[LuckyP]

Yowzers!!! Looks pretty mean eh??

[bluesatin]

i want one!