Great ET, low MPH

[35R]

Can someone explain why good ET's come with lower MPH? I noticed at the nats my best ET was about 122mph, whereas nearly every other run was 125mph.

[NickS]

Maybe in order to hook everything up properly you were a little easier on the throttle ???

Stuffed if I know, good question though.

[Delft Maloo]

im sure someone told me once that a little bit of wheel spin can help your mph as it gets your wheel momentum going a bit quicker, as a downside the lack of traction slows down your et. with absollute traction you obviously have more resistance against your tyres slowing them down. the ideal sollution imho woud be a controlled amount of wheel spin. sounds stupid but watch the top level cars. they have heaps of power but not one of them has abollute traction to run a fast et. to much traction can help your car bog down ever so slightly even if you dont realize. the quickest times down the 1/4 are often associated with there slightly slower mph, watch if they have a bit of traction issues as there running and they usually run a faster mph if held on to to complete a full pass.
just my thoughts which ars probably BS but it sounds good to me.

[oztrack]

People have been discussing the right lane at Heathcote being out at the meet. Maybe a similar anomaly to what WSID has at time - an effect of shinyness of the track surface and the sensor system. They have verified this to me and it can be fixed.

Compare your last 320 foot times. or last half times. To be quicker at the end they almost certainly need to be shorter.

[35R]

People have been discussing the right lane at Heathcote being out at the meet. Maybe a similar anomaly to what WSID has at time - an effect of shinyness of the track surface and the sensor system. They have verified this to me and it can be fixed.

Compare your last 320 foot times. or last half times. To be quicker at the end they almost certainly need to be shorter.

MNR-0 mentioned to me that shinny wheels confuse the system at Heathcote. I tried both lanes and got pretty consistent results though -90% of runs 125mph. However i did see some obviously wrong times down there with other people. Another annoying thing at Heathcote, burnout smoke stuffs up the staging beams, i tried to stage with my back wheels once or twice! (lights flashing, going red etc).

[CV860L]

Maybe Lugenpopper can shed some light on this, he had the opposite problem: 16.5sec 1/4 at 120mph........

[Quadcams]

im sure someone told me once that a little bit of wheel spin can help your mph as it gets your wheel momentum going a bit quicker, as a downside the lack of traction slows down your et. with absollute traction you obviously have more resistance against your tyres slowing them down. the ideal sollution imho woud be a controlled amount of wheel spin. sounds stupid but watch the top level cars. they have heaps of power but not one of them has abollute traction to run a fast et. to much traction can help your car bog down ever so slightly even if you dont realize. the quickest times down the 1/4 are often associated with there slightly slower mph, watch if they have a bit of traction issues as there running and they usually run a faster mph if held on to to complete a full pass.
just my thoughts which ars probably BS but it sounds good to me.

I noticed especially in a manual car wheel spin equals lower mph, I am going through this problem at the moment, car has done 116mph but at the moment can only achieve 112-113mph and through 1st and 2nd squirming around like a wet mop, next week have a few changes and should net some better results.
Have seen cars with way more power than me running no where near the mph to the power the car is showing, they were manuals and running street tyres, lots and lots of wheel spin.
Think of it like this, spin the wheels in 1st and 2nd firstly your wasting hp but moving forward therefor less distance once traction is achieved to reach a your potential mph, bacically you have a less of a distance to accelerate due to loosing some acceleration from wheel spin.
Another good example is if youve seen Top Fuel race and both had a good start and side by side but half track one starts spinning its tyres and slows, the other one pulls away like a rocket and records a much bigger mph, seen it many a time.

[Delft Maloo]

good point there quadcams. ive certainly seen my share of top fuel action over the last couple of years, the trouble is with top fuel is once they haze the tyres mid run they have to shut out of it to try and regain traction. your et is only ever going to be good as long as you can get your 60ft right. looking at some old slips from a while ago my calais ran within 1-2mph on every pass out of eight from the same night no matter what the et was and there was a varience of a couple of seconds in some. the 60ft went from bad to worse but the final mph was still the same. bogging down off the line a bit can result in a slow 60ft but good mph cause you have full drive over the entire distance, where as even a launch with a small bit of wheelspin can cut a good 60ft cause youve carried good momentum to the 60ft point and if you can keep it going should result in a good et and mph.
gotta get that nice balance point of traction off the line with out bogging down and the results should come(hopefully).
keep us updated quadcams

[Quadcams]

good point there quadcams. ive certainly seen my share of top fuel action over the last couple of years, the trouble is with top fuel is once they haze the tyres mid run they have to shut out of it to try and regain traction. your et is only ever going to be good as long as you can get your 60ft right. looking at some old slips from a while ago my calais ran within 1-2mph on every pass out of eight from the same night no matter what the et was and there was a varience of a couple of seconds in some. the 60ft went from bad to worse but the final mph was still the same. bogging down off the line a bit can result in a slow 60ft but good mph cause you have full drive over the entire distance, where as even a launch with a small bit of wheelspin can cut a good 60ft cause youve carried good momentum to the 60ft point and if you can keep it going should result in a good et and mph.
gotta get that nice balance point of traction off the line with out bogging down and the results should come(hopefully).
keep us updated quadcams
Yeh mph can do your head in sometimes in a manual, even where you changes gears can affect mph, short shifting etc. I have noticed in the past nearly every time my best et's didnt match up with my best mph.