Fastest Stock Twins thread

[gmogle]

Scott,

I met the guy who bought yours the other week. Should be seeing the car soon but its got a single on it now.

Nice to hear from ya.

[russellparkerx]

Torch graciously accepted SDMinus.  So how the hell did you lay down a 12 flat?  What boost and power were you running?  And how did you resist keeping the car long enough to take home a ticket with an 11 on it?

[russellparkerx]

So I shaved a hundredth of a second off at Rotorstock today.  13.08s

[Aceman]

Started badly:

1/4 mile: 15.03074
60ft: 3.3765
MPH: 104.23

Improved:

1/4 mile: 14.4100
60ft: 3.1564
MPH: 109.63

Then realised that there\'s a difference between pulling away from traffic lights and launching so started actually doing the latter..

1/4 mile: 12.9166
60ft: 2.1515
MPH: 110.16

Still got more to come from her as she\'s not running right (boost leak & ignition problems so have toned down the boost a little).

Std twins non-seq, porting, extra fueling, p*ss poor cooling..

[civicboy28]

Gillard28 cheers for your help today. If you need any help rotax wise, feel free to give me a bell anytime! I owe you one.
 
Andy

[karl_tate]

good times there guys,

so what did you differently to improve the launch??

[Ada7]

I did 15 runs on the saturday most of which were high 13s and some bad low 14s. I think i was trying to lauch to hard and so just spinning loads of the line so i lowed the revs a bit and that seemed to help.
I did manage a new PB for me of 13.1 @105mph. 2.0976 60ft which i think is my best lauch but will have to double check that.
i have had higher et speeds... does this mean if i can get the same good lauch and get the higher speeds somehow my time will be better??

Adam

[civicboy28]

faster speed = travel more distance in a set time.
Better launch = get to faster speeds sooner.
 
To answer your question....Yes think so.

[Aceman]

good times there guys,

so what did you differently to improve the launch??

Honest answer is that I actually bothered trying..

Simply put, I kept "launching" like I was pulling away from the lights. 1500rpm perhaps 2000rpm when I felt like "really giving it some beans"..  :rolleyes:

Then I did some simple maths - to pull away I need torque and, well, I have very little of it at 1500rpm. Upped the revs so launching at 3500 and bob\'s your uncle - I actually moved off the line!! Filled the car with smoke though - seems my clutch is more dead and slipping worse than I first feared...

[russellparkerx]

My 13.08 from Saturday was with a 1.98 second 60ft by the way... Pretty happy with that.  My terminal speed was nothing special - 107mph, whereas my previous best was 13.09 at 111mph.  4 mph lower but a hundredth faster...  Loads of factors in play eh?

[Aceman]

My 13.08 from Saturday was with a 1.98 second 60ft by the way... Pretty happy with that.  My terminal speed was nothing special - 107mph, whereas my previous best was 13.09 at 111mph.  4 mph lower but a hundredth faster...  Loads of factors in play eh?

1.98 on road tyres? Good going that man!!

[Ada7]

I might have to invest in some stickier rear tyres on some standard wheels. Would help a little i think

Adam

[russellparkerx]

Tell me about it.  Yokohama Advan sports - right down on the last of the tread... It really felt like the perfect launch.  Won a good bet over that 60 ft.  With the lower terminal speed of that run I\'m sure it would do sub 13 given the right conditions, but it feels so well set up at the moment I\'m loathed to wind it up further.  Can\'t keep taking it up there and abusing it in the hope of a following wind one day...  Maybe I should grease it.

[gillard28]

Hey no worries.
 
You dont needs loads of revs for the launch. But you do need to understand how the rear end of the car works and have a .... load of tq low down.
 
scott

[gillard28]

Coz i love the sport here is a pic at your target