lowprofile

Lol...yes, you need some updated vids!!! Get workin' on dat!

RedBullJnky

Here is Gadget's car.

JoeNobody

All very nice. The 5.5L turbo E63 is 10 seconds, just from a tune and drag slicks. Absolutely insane.

MindBend

I am surprised no talk about weight reduction here...it's as good are more ponies. Interiors stripped, no A/C, lightweight wheels, what's the lightest anyone has weighed-in with these beasts and still street-worthy?

In my road-racing days, started out with a super-light car (3rd gen RX7 R1) and found more and more weight reduction. Car weighed-in 2640 with me in it and perfect corner weights (within 1 pound), and made 385 to the wheels. Of course, didn't massage my back while driving like my CLS and the sleeper factor not even close.


(NOTE TO SELF: Start saving pennies for 5.5 Turbo 63.)

e55amgrocket

I didn't do the weight saving stuff because I wanted to run it in 100% street trim to see what it could do and yes I drove drag radials on Q16 on the street. I weighed in around 4400lbs.

MindBend

That's impressive...not many other cars have those bragging rights.
Driving Q16 on the street is great. What's the per-gallon cost of that stuff these days?

For those who have spent serious time testing and tuning, what kinda A/F makes the power w/o going boom?

cij911

From the factory it is in the 10s (crazy rich)...I am at ~11.5 AFR (on 91 octane). I have never seen a huge HP increase (with other cars) from 11.5 to 12s so I usually just leave the margin of error with FI cars.

MindBend

Good info...thanks. Trying to dial my car in with my Weistec. From what I'm seeing on short blasts, it's more lean. I'm aiming for 11.5-ish on 93 octane. In the midst of more data-logging with Zeitronic stuff, so will have LOTS more data in a few days.

Hammer Down

im in the same boat as Steve I show up to the track on 96 octane (tuned for 91) and slap on drag radials.

RedBullJnky

When I ran in GA I had no seats (front or back), light weight clks, front skinnies, braile battery, and a carbon race seat. Car weighed 3800lbs.
When I ran in MD, I had no seats, carbon race seat, clks, and didn't weigh the car.

e55amgrocket

On pump gas AFR's in the 11's seem to be fine. In race gas you almost have to experiment with what it likes. I found out on my Q16 tune that it had to be very rich. I actually found out by doing a pass with the nitrous off but spraying the fuel side of the system and picked up .2 tenths. I had Jerry add something like 10% more fuel and the AFR's were down in the 10's but that's where it ran the best.

MindBend

Cool. Thanks for the info. For those spraying meth: Does a higher ratio of meth:water change the AFR much?

Junky, can you correlate your weight to an ET? 300-400# is a lot. I wonder what the entire interior weighs? (not that I'm even remotely interested in doing it)

RedBullJnky

Full weight on pump 93oct, in 90*-100* heat, I would run 11.40s @ 121-122 all day in FL heat. A week before GA, I added meth, Q16 and weight reductions. Car ran 11.03 @ 126.
At MIR, in 40 degree weather I ran 10.70s all day (while running out of gas). No changes were made except adding a Quaife. And didn't have skinnies or battery.

MindBend

10.7's all day is BEAUTIFUL!
Your bottom-end hold up for that or did you change it?

Cooling is what I'm working on now: reservoir, bigger pump, etc. How did the meth effect your IAT's? Was it a contributor to your "all day long" thing?


I'm not a drag-racer, but trying to learn from all of you guys who've learned from hard-knocks (pun-intended).I hope to get my car worthy for track days on the road course.

Sir-Boost-a-Lot

iTrader: (1)

Steve you're killing me with this 10 second 4500 pound Mercedes on the road coarse stuff

chawkins2001

Pull out the weight, it is quick easy 300lb drop. Front seats weigh about 75lbs each, braille battery is 40lbs weight saving, and wheels are easy 20lbs savings per corner. 50/50 meth mix on my car is a .5 point richer air fuel when it sprays. I am on e85 so I cant talk how it affects race fuel or pump gas guys. I dont tune for the meth either.

MindBend

It'll be a pig in the turns, but I'll see how it goes. A big HP track like The Glen will favor the big ponies. (and test the limits of those BIG 2-piece rotors). They DID test it on the Nürburgring, right!?

Sir-Boost-a-Lot

iTrader: (1)

Bring it down here next time you need a vacation, I can get you onto Daytona if you really want to log IATs

MindBend

That infield would be a KILLER for the beast...Big/Fast course is what it needs. Plus is that infield is anything like Pocono, they can HAVE IT. They don't think cars that turn right also are worthy of any track maintenance.

RedBullJnky

Thanks!
The bottom end held up pretty well, considering I'm on my 2nd torque converter, trans, rear axles, and diff. Broke the trans and converter in GA with Chawkins. And broke the diff and driver side axle a month before I went to MIR.

Cooling is very important IMO. My IATs never went over 110 with my cooling and NO meth. I used meth to cool even more. I'm not tuned for meth either. It only comes on after 11psi.
Before the meth I would reach peak power 550whp around 5700rpms and would drop quick. By 6600rpms I was 480whp. After meth (no other changes) I would still have 549whp at 6900rpms. Gained 72whp after 6000rpms.
Remember my meth did not add power. It simply allowed me to hold peak power through redline.

And I'm not a drag racer, I'm a pro golfer.

MindBend

Wow...lotsa broken parts. Still on original motor?

Sounds like meth is totally the way to go. Are you spraying before or after I/C?

Pro Golfer+clubhouse+crazy car=dramatic country-club exits!
(or is that just the novice route? I was at my favorite local pub a few weeks ago when some loud-mouth old-man golfers came in. Luckily I had my iPhone handy to snap a couple of shots when one went into the ladies room!! He toned it down when I showed him the pic and denounces his amateur ways!)

RedBullJnky

Yup, still on stock motor. Last compression test was at 180psi on all 8. I think it's still good. Lol

I've played on three small tours for a few years now. Nothing major. I haven't been playing much lately (tournaments anyway). Time to start back up though.

I have dual nozzles that spray right after the IAT sensor, Since I have no tune for it. I've run out racing on the street and at he track. Never had any problems.

And I'm known on just about every golf course in S FL. So I can't drive to crazy. Besides, how can you forget a golfer covered in tattoos with a blond Mohawk.

lm7

Subscribing any new members?

Denroll

My car will bench race 10's all day long.

But on the reals, I have my new tune coming tomorrow, I have the torque converter installed, and a new set of slicks, so I'm ready to give it a shot. Two things to make me worry: Heat in the AZ summer and the near 4,000 ft elevation at the track here.

I want to do it in full weight form, but I might pull the passenger seat to offset the weight of my massive junk/*****.

lm7

Dennis if you go 10.99999999999 at 4k elevation I will tell you right now we are all not worthy!!!