jrcart

Thanks to everyone for the props, however this was honestly not even a great pass. DA was between 2650 and 2900 depending on which sites calculator you use, track prep was worse than poor. My last time out at Fontana in April I was putting down 1.6X and a couple 1.5X 60 foot times, the 10.8 pass shown in the vid was a 1.7X so I am leaving a few tenths on the table just with the launch alone. We are still in the testing stages and did not even work our way up to the most powerful pulley because of the poor track prep and traction issues. Its a good start and the hopefully shows the potential of the Weistec package. Stay tuned.

blownS

Props to u for always pushing the envelope and keeping it real.

U must b very proud (and deservedly so). Keep moving forward.

dodger63

Obviously the car doesn't need to be in m to shift manually

dodger63

Weistec, quick question I might be totally off line here but, will the s/c system take a bit away off the line? Like the 60' to be exact because of the extra resistance on the motor?

jrcart

In April I was at Fontana putting down 1.6x and 1.5x 60's with the blower installed so I don't think it has effected my car in that manner but a good question none the less.

Weistec

It’s actually the contrary; the car is making well over 600 ft-lb of torque to the wheels from the moment it leaves the line. Torque is what will break the inertia of the cars weight and get it to 60ft asap. Due to track conditions we were taking the strategy of ramping in the power to keep the tires hooked. At a prepared track we will be able to leave everything in it and plant all the power to the ground.

Thanks

dodger63

Your right I keep forgetting that to much in my head

dodger63

Hard to really think about all of this.. What I really meant, maybe I can explain better, if the belt is longer with more auxiliary components let's say. A/C for example it pulls a bit of power from the car. The extra component s/c must put a little strain on the initial power?

LOCO 05' E55

Respectable times indeed in the type of conditions! How are you keeping the IAT's on CK? And what type of IAT's are you seeing up top? any heat soak? She seems to be running cool but the Slips can explain it a better.

Optimistically thinking- what times are you shooting for with this kit? hopefully low 10's and even 9s..Just weighing in The Blower Vs The Bottle in terms of Cost, Power and reliability.

SMP

Since a charger is driven by the engine, just like the water pump, alternator and A/C pump, it will cost some HP. However, out of the hole you won't notice it, because it's replaced by torque. But up top you will. Not sure if the 1/4 is long enough to have an effect on it.

BenzoBoi

Great times for conditions! Definitely subscribed to see the progress!

URnext

Awesome times!!! Especially for the conditions & track. Fontana sucks.

Look forward to seeing your times with way better conditions.

Congrats

dodger63

I guess we are talking negligible powerless that it most likely wouldn't be noticed at all!

wonsuk_utmb

Have to completely agree. Thanks JR!! Your contributions are what keeps forums relevant.

jacob502

+1.

I'm very confident he can get in the mid 10's easily if not low 10's. congratulation Jrcart. you got a monsterous beast on your hands. Keep up the good work

Weistec

We like to release wheel horsepower dyno numbers and curves so everyone gets to see exactly how much power is put to the ground at any given time. This accounts for any powertrain loss and is something that we feel is very transparent. If you watch the video you can see how we ramped the power in to get traction and then dropped the hammer, although the GoPro video camera in the car didn't seem to like it very much.

Thanks guys!

Maverick1975

What do you mean ramped the power in? can you explain that to a complete dragstrip novice like me?

jrcart

Due to the increase in torque I have obviously had to adjust my launch teqnique however due to very poor track prep I had to launch at an even lower than desired rpm. I use a brake stall launch technique (brake torque). If you compare my launch in the video from last night to the video from April you can not only visually see a much harder launch but you can hear the car reved up to a higher rpm as well. What's odd about that is that the car was making more boost in April and I was able to brake stall up several huundred rpm higher which should show everyone how poor the track prep was on my 10.8 pass. Theoreticly I should be able to brake stall at a higher rpm with lower boost/torque before reaching the traction threshhold of the tires. To put it in even more simple terms, take a E350 and brake stall it up to 4000 rpm and let it go and you you're off to the race with no wheelspin likely, now take an E63 brake stall it up to 4000rpm, let it go and you're not going to do anything but smoke the tires, in order to launch the E63 and get a similar 60ft as the E350 you need to lower the brake stall and roll into the power differently. Drag racing isn't rocket science however it is more complicated than just mashing the pedal to the floor.

whipplem104

You can also ramp the timing to reduce torque at lower rpms in the tune. Pull timing in the lower rpm range to calm the car down. Makes it much easier to launch and a more linear throttle for daily driving also. If you make enough hp/tq then a timing map per gear would be ideal. It is like the big hp turbo guys do not normally make full boost in 1st or 2nd or even 3rd.

JDB

Hi JRCart,

I presume that you car still has the stock rear-end ratio in the differential.

I wonder what sort of times you could cut if it were properly geared for the quarter-mile, and not for all out top speed.

I seem to remember that you have clocked over 200 mph on the way to Las Vegas in your car, and that was before the supercharger modification was added.

JDB

jrcart

It would be easier and cheaper to experiment with wheel and tire diameter, you can "cheat" the final drive to a certain extent with taller or shorter tires. Believe it or not I still consider this a road racing car, I don't want to turn it into a drag only car so playing with the final drive is not an option for me.

betrezra

Are you adjusting your BS suspension for optimum wgt transfer to max hook-up min ET?
or is all of this with your stock BS suspension, and suspension settings?
Are you running slicks or drs?

Fun to watch from the sidelines!!!!!!

ecampbell

Betrezra - get your butt and car out to Vegas for the 19th of Aug and come play with us. It will be hot, slow times but it is vegas! I am coming out from Italy to do what will probably be a handful of runs so I am sure you can come from Texas!!

slownrusty

Absolutely amazing!!! Speechless! Congratulations.

jrcart

I purchased an extra set of OEM Black Series shocks and had them revalved so they have softer compression and slower rebound and a set of special taller and softer springs. I am currently running 17 " DRs and skinnies up front.