NS_C63

Hi guys

A friend of mine with a C63 has been having some issues lately.

Evertime he launches the car from abour 1300-1500 the car gets going and then at about 3500 the car sort of shuts down for about 0.5 / 1 second and then gets going again. Does the same with DR and street tyres. Car throws no error codes at all. I he goes about half throttle till 3500rpm and then floors it the car is fine. We both have the exact same exhaust and tune so it is not tune related.

Any ideas what it could be?

Dads C63

How much fuel is he running? These cars are HORRIBLE with fuel slosh and pick up.

NS_C63

It does it all the time, half tank, full tank or 1/4 tank.

callmiro

It's called traction control...

mthis

do you know something i dont know about this issue? my car also bog from 2-3K then takes off. thats part of the reason why i think i cant get beter 60 foot then 1.8. any help?

PetroC63

Same here, happened to me last night at E-Town. 1.87 60 foot.

The car needs a higher stall torque converter badly. The stock stall
just doesn't cut it. I think it bogs because your not able to launch
the car in or near its peak torque range. A 3000 to 3500 stall converter
would do the trick.

Keith/Dads, what stall speed are you going with in your car?



Mike

superlubricity

Dads is going to run a 2800 stall. I'm not sure on what diameter.

PetroC63

^ Thanks super.

I think he would benefit more with a slightly higher stall, maybe
3200.


I remember back in the day with my 1990 Mustang LX 5.0 with AOD
transmission, a simple torque converter(3500 stall) change from
stock netted me consistent high 1.6 and low 1.7 60' times. In stock
form I was consistently in the high 1.8's, on slicks ofcourse.

I know were talking about two totally different cars but wouldn't
the principal remain the same?

NS_C63

Traction control is off.

SonnyakaPig

That's what it sounds like to me. Sounds like they're launching in Sport ESP or ESP ON.

Edit: I stand corrected.

superlubricity

Principal is the same.

Funny, I brought up my previous experience (quite similar to yours) in this thread last night-> https://mbworld.org/forums/4252281-post194.html

NS_C63

Traction control definately off.

Tyres can be warmed up with no issues, so
I don't think its got anything to do with ESP.

PetroC63

Very similar results.

I wonder what a custom made torque converter costs.

Before doing headers I may go this route.

BTW, I ran a 12.32 @ 114 with a 1.87 60' time at Raceway Park in Englishtown last night. I was kind of disappointed with my trap
speed. I was expecting my mph to be a little faster.

mthis

how was e town

dint Keith get a 1.6 60 foot with stock stall. comon DAD tell us the trick.

PetroC63

E-town was great. Last time I was there was about 5 years ago
with my G35.

That GTR was insane.

mthis

your trap is low for a tuned car but that etown for you. track suckkkk big time,
go to atco man 2MPH more and 3-4 tenths diff. WANNA GO TODAY?
i ran my car stock with stock tires at atco 12.276@115.22 and with MT's 12.168@115.82 best stock trap was 115.89MPH with MT's

my best stock times from e town were 12.452@113.02 with street tires and
with tune only i ran 12.097@116.51 street tire 1.89 60Foot positive 1000 DA.

that GTR is FASTTTTTTTTT i still dint race him yet do

_AMG_

+1

PetroC63

Can't go today, have plans. Sometime next week is better for me.

Atco is that much better?

Also, I kept having problems with the TPMS sensors. Set the M/T drag
radials at 20 psi in the rear and I kept getting check tire pressure
messages during my runs.

Can this have an affect on power? Will the ECU kill power if it thinks
your tires are low on pressure?

mthis

Atco is great track some ppl say that etown goes up hill and some say Atco goes down hill so will find out when i get my Vbox

nah that happens all the time. i do THINK that MT's F**K up the 60foots do. to tall i got nitto 555R's now so will see if my 60 foot gets beter. im hoping for at least a 1.7

PetroC63

Thanks for the info.

The M/T's are tall. I'll have to look at the Nitto's for my next set.

Even Money

What was your DA? You can see in my sig, I ran about what you did with me having 405 whp. Almost same RT. I think if you reset the TPMS after letting the air out, should be fine.

PetroC63

Using dragtimes DA calculator it comes up with 324.


I tried to reset the TPMS to current values but it didn't seem
to work. Every run about halfway down the track the dash would
light up red and the check tire pressure message would pop up.

Unbreakable1

just curious - what tune are you guys running?

i know mthis is running MHP, and Petro is on Eurocharged

Dads C63

My best 60' was with the Nitto 555r drag radials. The DA was incredibly good so all the planets were aligned. LOL There is no secret. I stage at 1000-1200 rpms and just mash and go.

The new converter is 2800 and I know a higher number would help the 1/4 mile but we are setting up to run the mile right now. We'll see after that.

NS_C63

Our cars are tuned by a company called Motronix based here in South Africa.