I put the EPL flash on my car yesterday and ran a 9.33.

It's an otherwise stock 996TT X50.

Run was made with a full tank of gas, weather was about 68degF.

Unfortunately the decline was slightly out of the 3% range, so I'll re-run on a different road later and send to be added to the official list.

Is this basically on par for a flash only X50?

Graph of the run:



Speed plot from 60mph comparing a stock run versus the flashed one. Unfortunately I didn't do a full 60-130 run stock (I thought I did, but I let off early without realizing it).



You can see from the above that it picked up about 5MPH around the area where it would cross the traps at a drag strip. When the stock tuned car was moving at 120MPH the flash tune'd car was at 125MPH. A solid 5MPH increase is nice (corresponding the roughly 50-60hp as advertised by EPL).

This is the graph EPL sent me regarding the gains I could expect from the flash:



And this is some data I massaged into Excel from the PBOX plotting acceleration versus RPM:



You can notice that the accel curve differences are almost identical to the dyno graph EPL sent me. BTW don't be misled by the start of the flash accel...I went WOT much later than I did on the stock tune run making it look like it was "lagging". I'll redo the run going WOT from a lower RPM and update the data later. It's amazing the data you can synthesize with these relatively inexpensive DAQs these days (all this data was from PBOX). With some additional math, the graph above could easily become HP/Torque versus RPM instead of Accel (gees). Road dynos FTW

If you can't tell... I'm a data kinda guy.

More to come as I continue to mod the car. I'm also looking for a spot to do a 1/4 run to get an idea of trapspeed, but long, straight, flat, no-traffic roads are hard to come by around here.

 

Great data!!

I look forward to seeing more as your car progresses!

 

Just go to Epping and test and tune for a day and learn how to launch the car. That's the only trap speed that matters or counts anyway.... I'm thinking this Saturday...

 

Nice, good to see some new numbers being posted. Get yourself a flat road and do it again. There is no trap speed that the Pbox will record, only the terminal speed at the 1/4 mile mark. It usually runs a liitle faster in the pbox.

Good luck and be safe.

 

I'll be busy picking on some vettes at a corvette club autocross this saturday. But maybe some other time.

 

Actually you can take the data from the pbox and just average the speed in the last 66ft (exactly what a dragstrip does) and get a trapspeed which correlates to a 1/4 pass at a drag strip. A friend of mine tested his pbox while going down the track and it was dead accurate as long as you do that with the trapspeed. The instantaneous speed it displays will of course be a little higher like you said.

 

Are you sure that's steeper than 3%? It's only a 13 foot drop over the course of the run. Please email me the .dbn file. divexxtreme@hotmail.com

 

nice to see some solid data points on just a flashed x50...looking forward to seeing what you achieve with more mods...

 

Oops..looking at it again, you are right. Emailed!

 

Verified! https://www.6speedonline.com/forums/...ml#post2994162

 

Sure, you can do the math, but who's got that kinda time?

 

Yes, thank you very much for sharing.

 

LOL... well, drag strip 1.5hr from where I live vs PBox nearby late at night on (I realized the road I used is actually .3% not 3% decline ... stupid math ) is a 10min affair plus a few minutes for the math. I used to live next to a drag strip a few years ago, and that was very, very nice. I'll definitely hit the drag strip for some "official" times when the car is a little faster and I have a clutch and some ET streets.

 

I did a cpl of PBox 1/4 run on the same road. First run it trapped 119. Then I did another run shifting faster and it trapped 120mph (121.03mph terminal pbox speed). It's hard to shift this car fast and keep it on boost. I can shift my Supra way, way faster. I'm hoping that will improve with the GT2 clutch hydraulics and some form of SSK.

The crazy thing is the 60-130 during the 1/4 pass was 9.75 due to the 2shifts. With 1-shift its a 9.33. Shows what a HUGE difference shift speeds can make in turbo car performance. Even though the stock K24s spool reasonably quick, you really have to keep these cars on boost between gears to get great performance. No surprise here from my 8yrs+ racing turbo cars.

From my previous experience drag racing turbo cars, I feel there is probably another 1-1.5mph in it with quicker shifting. But that's benchracing.

Is 120mph decent for an X50 with just a flash? I still need to play around with shift points to see what the optimal is on this setup.

I'll verify at a 1/4 track sometime for an "official" time slip, but from the results of testing Pbox while going down the track, it is very accurate in this regard so I don't expect any surprises.

 

I think mine was a 9.53 EPL flash only on a regular K-16 car, and first try, but hard to mess up with one shift and flash only car. So sounds about right, and it will not be enough.....