Porsche Enthusiasts Club Forum

Hi All

Well I did it…. 208.10 MPH

Over 208 mph….which I figure makes a UK RECORD for 928`s and also is faster than any model of Porsche as it leaves the factory.

Figures are as follows… although some have been deleted due to location and information I am not willing to share on the Internet lol.
Any local 928 or Porsche owner are welcome to come see the proof.

TYRE PRESSURES – 40 FRONT 46 REARS
TEMPERATURE - 52 FAHRENHEIT
ENGINE REVS 6865
WHEEL SPEED 0
BATTERY VOLT 12.3
LATERAL G -0.04
ACCEL G 0.21
GPS_DATA 0.000
GPS_SATELLITES 9.OO
GPS HEADING ****(DELETED)
GPS_MPH 208.10
GPS_Gs 0.18

Nitrous pressure – Start - 975
Finish - 680

Amount of Nitrous used, just under 700 hp, hard to be precise but an educated guess is 680 ish.

Damage to my car…lost both wiper blades at around 190 mph and now breathing oil a little more heavily from offside (camcover gasket I suspect) , also lost a bolt from engine undertray when grounded during the final run and twisted the tray a little, but still driving daily to work.

Impressions of the run…..I activated the Nitrous at around 125 mph and it started really pulling hard and just kept going….at around 180 plus the car started going “light” (only way I can explain it…a bit like aquaplaning) it got lighter and lighter although still accelerating and when I saw 207 on my GPS speedo , I backed it off and that’s when it got REALLY light it was like travelling on oil not funny at all , the back end was worse than the front by far

It seemed to “drop” back onto the surface at around 185 ish (decelerating) and I had grip again which was a huge relief.

If I ever do it again I need to do something about pushing the back end in particular down onto the surface.
Any advice on rear aerodynamics welcome….

Was it as easy as I expected….no it was MUCH harder…from around 180 to 190 although the Nitrous was pushing me at the same rate I was not accelerating as fast and seemed to be slowing although still accelerating ….aerodynamics I guess.

Was it worth it? YES

Future aims? Not decided yet but possibly 220 mph.

All the best Brett

Well done!

Hey don't kill yourself mate. Remember what happened to Donald Cambell. Think you need to borrow a wind tunnel. Some of the guys who race big engined cars know a fair bit about aero. I'd ring around some of the race teams. Must be loads in the South.
Congratulations on the record!

Congratulations, but all sounds a bit frightening. Just wondering how many tyres you go thru for these epics?

Souds like "squeeky bum time". My mate got to 158 on his bike and said " I think I was touching cloth ".

Well done.

Nice one Brett, all the hard work is paying off

Well done, glad it all went well, maybe F1 teams may help with wind tunnel and aerodynamics as you are doing these runs for charity

Fantastic Brett,well done!Must be a good feeling after all your work and dedication.Where did you do it?

Congratulations, but why didn't you ask us along to watch - sounds like something we'd all have liked to be there for?

Hi

Sorry about that but it was a spur of the moment kind of thing....

All the best Brett

Hi

Top speed runs are not a problem for tyres, its launching hard on Nitrous that is lol...an average of a new set of rears every 2 months or so...Falken 452s at around £300 per pair....275/40/18 ...

All the best Brett

Brett - you should now change your user name to 200mphBrett.

Well done Brett. Impressed the V8 held together under that level of boost, shows how much margin was left by Porsche at design time.

Congratulations Brett. When and where will you let the general public see you run?

Phil

Hi Jim

Thanks

Here is a post I just put up on Rennlist which shows your point, I was impressed that the engine lasted but more on everything else up to 185 ish...

"
It was an unknown for me, as I "thought" the extreme Nitrous power would do everything lol...

I was totally wrong....

The stability of the car was perfect until around 185 (which says a LOT about how good a 928 is and how good the design was)

I could have happily driven all day at around 180 as an example....

Above 185 ish it started going "light" which is the only way I can describe it....

Then I was concentrating on the car "slowing" even though the Nitrous was still pushing the same amount of power...the only way I can describe it is it felt like the car was progressively getting a lot heavier....

Above 190 to 200 ish it was getting lighter and lighter but still pulling reasonably hard though slowing in acceleration...

I originally intended to try for 210 but I REALLY didn't like the way it felt over 200....

Once I got to 207 (which I knew would achieve my ambition of being faster than ANY production Porsche) I decided to back off, which I did...I lifted my foot completely which was probably a mistake as I suspect it unsettled the car.....it still increased to 208.10 but by then I was in trouble and knew it

The car although still moving forward was under almost no control, it seriously felt like I was sliding on oil or ice, so I did what we used to do in Top Fuel when using a Butterfly wheel after we lifted off and before we pulled the chutes.....tiny tiny movements to JUST try and keep straight, nothing more.....no braking, no nitrous adjustment...no nothing (a little praying maybe)

When the cars speed dropped to around 185, it sort of "landed" back on the surface and I had control again, although I let the speed drop to under 100 before I tried braking, and all was fine...finally.

Would I do it again.....yes, but ONLY once I have DRASTICALLY improved the aerodynamics, but at least I know that I will feel any improvement at around 185 to 190, I wouldn't top 200 again until it felt a lot better at 195 ish....and I ALSO wouldn't lift my foot straight off, I would EASE back on the power so as not to unsettle the car....which may or may not help "


All the best Brett