LSDs and drag racing opinions...

nrgy · 10-14-2009, 09:27 PM

Sorry to bring this up again as I know it's been debated in the past, but I'm still very confused as to whether or not a Quaife LSD will help with my launches, and improve my overall 1/4 times. I've read that some did not notice any improvement in their 60' times after installing one, however I don't know if these people were already cutting good 60's prior (ie. under 2 sec). Whereas for someone like me, who is only managing 2.3s 60's on street tires, perhaps I would see some improvements?

Just trying to think about it logically, but I would think a LSD would help for sure. Maybe I'm not understanding it right, but if you get both wheels to spin instead of one, then you essentially double your contact patch?

Again, I can see if someone is able to cut really good 60' times like 1.8s on street tires, then already there is little room to improve and therefore any benefits of a LSD in straight line would be greatly diminished. And I would think to achieve those kind of 60' you would be right at the threshold of spinning your tires, but not, and therefore negating the need for an LSD. But for everyone else who isn't able to quite master that fine touch of not spinning at the start???

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jturkel · 10-14-2009, 09:44 PM

i can tell you that Hooleyboy cuts 1.6xx 60's in his 480whp (dynodynamics) C55 without a mechanical LSD. he said the best thing was putting certain fluid in it (don't recall what kind) and his MTs.

Bisco · 10-14-2009, 09:49 PM

IDK about all that but I wouldn't advise taking LSD to try to improve your drag racing skills

jikjak · 10-14-2009, 09:51 PM

i dont think the lsd will help much with your launch. both tires are able to spin anyways, i know im able to lay down 2 patches of rubber on a burnout.
the lsd will make a difference in handling and u would notice it on the circuit.
if u want to imprive your 60' time, you should invest in some drag tires. that would make a huge improvement for your launch.
my best 60 on streets was a 2.065 or so and after getting DRs my best was 1.735. there is still room for improvement there as well!

chiromikey · 10-14-2009, 09:53 PM

our cars do put power down to both wheels at launch. no way I could have cut consistent 1.71's on street tires with a one legger. so put me down as one that unfortunately didn't see any gains from the quaiffe.

jikjak · 10-14-2009, 09:59 PM

damn 1.71 on streets!!! u sure are skilled!
can u drive mine on the strip one day? hehe
it be nice to see what my car can truly run with a great launch!

chiromikey · 10-14-2009, 10:05 PM

lol, u should have come to famoso...at last years event and out of about 30 passes, I only got to run my car three times!

E55Bullet · 10-14-2009, 10:08 PM

drags help sooo much! I run the nitto's on the street and strip and that is all you need!

nrgy · 10-14-2009, 10:19 PM

Ok, thanks for the replies. I was hoping I could take the easy route and have a LSD solve my problems, but it looks like that's not happening haha.

I wish I could run something like nitto's for the street and strip...but I think I'm limited in choices with 19" wheels?

c32AMG-DTM · 10-14-2009, 10:24 PM

Quote:

Originally Posted by nrgy

Ok, thanks for the replies. I was hoping I could take the easy route and have a LSD solve my problems, but it looks like that's not happening haha.

I wish I could run something like nitto's for the street and strip...but I think I'm limited in choices with 19" wheels?

No. You could easily run 17- or 18-inch rears (maybe even 16's?). Just need a taller sidewall to get to approximately the same overall diameter. More sidewall helps anyway, as it grips much better on the launch.

prodigymb · 10-15-2009, 01:25 AM

Quote:

Originally Posted by c32AMG-DTM

No. You could easily run 17- or 18-inch rears (maybe even 16's?). Just need a taller sidewall to get to approximately the same overall diameter. More sidewall helps anyway, as it grips much better on the launch.

you can do 18s with a 265/40/18 MT which is slightly taller then stock. I use Nitto 555R 305/35/18 which grip insane on the street and are fairly good on the track too.

you could do 275/40/17 MT radial on a 17x9 or 8.5 wheel. or you can go the 16" route and do a 255/50/16 MT. 16s will need to be custom made by either CCW or Bogart to clear brakes. Bogart does 6"s of backspacing on an 8" rim, i'm not sure of the CCW specs.

hooleyboy · 10-15-2009, 01:37 AM

1.567 60ft with no LSD in my car. very consistent 1.6's. Get some ET Streets Micky's. If your road racing then you will want the predictability of a good LSD. No doubt they are good to have. It just wont help that much for drag racing.

I guess like anything else there is room for debate on this.

RenntechE55 · 10-15-2009, 03:53 AM

Quote:

Originally Posted by nrgy

Ok, thanks for the replies. I was hoping I could take the easy route and have a LSD solve my problems, but it looks like that's not happening haha.

I wish I could run something like nitto's for the street and strip...but I think I'm limited in choices with 19" wheels?

try some Nitto NT-05's I have them in 275/30/19 and they handle my 580rwtq pretty good.

jikjak · 10-15-2009, 05:22 AM

Quote:

Originally Posted by nrgy

Ok, thanks for the replies. I was hoping I could take the easy route and have a LSD solve my problems, but it looks like that's not happening haha.

I wish I could run something like nitto's for the street and strip...but I think I'm limited in choices with 19" wheels?

drags are the easy route.
just buy 2 smaller and lighter rims and drag tires.
throw them on at the track.
bust out a good launch!

much simpler than installing something like an lsd.

jikjak · 10-15-2009, 05:23 AM

Quote:

Originally Posted by chiromikey

lol, u should have come to famoso...at last years event and out of about 30 passes, I only got to run my car three times!

haha awesome!
ill have to make it out there one day and bug u to pull out a sick time on my car!

hopefully there is a spring event

10-14-2009, 09:44 PM	#2
jturkel MBWorld Fanatic! Join Date: Oct 2006 Location: Scottsdale, AZ Posts: 3,952 Drives: 02 C32 AMG	i can tell you that Hooleyboy cuts 1.6xx 60's in his 480whp (dynodynamics) C55 without a mechanical LSD. he said the best thing was putting certain fluid in it (don't recall what kind) and his MTs. __________________ \| 02 C32 AMG \| SL55 Intake w/K&Ns \| LET 185 Pulley \| RENNtech Tune \| LET Heat Exchanger \| Eurocharged Headers \| Res Delete \| NGK IX Iridiums \| Magnecor KV85s \| NW Pulley Saver \| NW ISO Kit \| Valentine1 \| DashDyno SPD \| CF Trunk Lip \| Soon: NW oil catch can FS: Drag Setup!

10-14-2009, 09:49 PM	#3
Bisco Senior Member Join Date: Jul 2007 Location: Kildeer, IL Posts: 420 Drives: 2004 E55	IDK about all that but I wouldn't advise taking LSD to try to improve your drag racing skills __________________

10-14-2009, 09:51 PM	#4
jikjak MBWorld Fanatic! Join Date: Sep 2004 Posts: 1,510 Drives: CLS55 AMG	i dont think the lsd will help much with your launch. both tires are able to spin anyways, i know im able to lay down 2 patches of rubber on a burnout. the lsd will make a difference in handling and u would notice it on the circuit. if u want to imprive your 60' time, you should invest in some drag tires. that would make a huge improvement for your launch. my best 60 on streets was a 2.065 or so and after getting DRs my best was 1.735. there is still room for improvement there as well! __________________ 11.344@124.80mph 1.795 60'

10-14-2009, 09:59 PM	#6
jikjak MBWorld Fanatic! Join Date: Sep 2004 Posts: 1,510 Drives: CLS55 AMG	damn 1.71 on streets!!! u sure are skilled! can u drive mine on the strip one day? hehe it be nice to see what my car can truly run with a great launch! __________________ 11.344@124.80mph 1.795 60'

10-14-2009, 10:08 PM	#8
E55Bullet Senior Member Join Date: Apr 2009 Location: Lafayette, IN Posts: 269 Drives: 2006 E55	drags help sooo much! I run the nitto's on the street and strip and that is all you need! __________________ -Rear Cat Delete -Res. Delete -172mm LET Pulley -Eurocharged Heat Exchanger -Eurocharged Custom Tune -CM90 Johnson Pump - -10 thermostat mod -S55 Driver's Side intake tube -K&N's -5% Tint 35% windshield -Mandrus Millenium Wheels -Nitto 555R's 285/35/18 -Front and Rear EBC Yellow Stuff Pads "It's more like a Hammer, a bit clumsy, but it will still kill you."

10-14-2009, 09:53 PM	#5
chiromikey MBWorld Fanatic! Join Date: Jun 2006 Posts: 3,693 Drives: '03 E55, Ducati 748R	our cars do put power down to both wheels at launch. no way I could have cut consistent 1.71's on street tires with a one legger. so put me down as one that unfortunately didn't see any gains from the quaiffe.

10-14-2009, 10:05 PM	#7
chiromikey MBWorld Fanatic! Join Date: Jun 2006 Posts: 3,693 Drives: '03 E55, Ducati 748R	lol, u should have come to famoso...at last years event and out of about 30 passes, I only got to run my car three times!

10-14-2009, 10:19 PM	#9
nrgy Super Member Join Date: Mar 2003 Location: Pacific NW Posts: 569 Drives: C63, A4	Ok, thanks for the replies. I was hoping I could take the easy route and have a LSD solve my problems, but it looks like that's not happening haha. I wish I could run something like nitto's for the street and strip...but I think I'm limited in choices with 19" wheels? __________________ C63 V1 3.864, 19" Multi Spokes, 35% F1 Tint, KW V3 Coilovers, Front Strut Brace, Carbonio CF Airbox MHP V3 ECU/TCU, MHP Long Tube Headers, Mids and High Flow Primaries

10-15-2009, 01:37 AM	#12
hooleyboy MBWorld Fanatic! Join Date: Jan 2007 Location: Glendale Arizona Posts: 2,923 Drives: my girlfrind crazy and the occasional Mercedes	1.567 60ft with no LSD in my car. very consistent 1.6's. Get some ET Streets Micky's. If your road racing then you will want the predictability of a good LSD. No doubt they are good to have. It just wont help that much for drag racing. I guess like anything else there is room for debate on this. __________________ I am a proud sponsor of MBworld under MBH motorsports MBH Longtube headers CLS55/E55 $3499 with test pipes! MBH Longtube headers C55 $2999 with test pipes! 100% money back guarantee if you don't make 40 or more WHP over stock!

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