Slowboy Racing ... LSD?

[copper_gst]

I am thinking about getting a LSD. So I have been looking around and had been seeing $300 to $400. When i looked on Slowboy Racing I saw that they had a FWD LSD for $190. That seem to good to be true. Is it?

Here is the link. http://www.slowboyracing.com/more.php?id=1241&

I would be thankful for any thought on this LSD and any other LSDs on other sites. Thanks.

 

[98EclipseGST06]

Yea thats true about the price because it is a LSD insert where you would mount the LSD an actually LSD runs from 500-1200 dollars.

 

[bmwisthekey]

Try doing a search for " LSD's" " Slowboy LSD" "Limited slip" etc..., there is a ton of info on this site about limited slip differentials as well as the LSD inserts.

 

[daren_p]

Do a search, there's lots of info on here. That is an insert & most say its only recommended up to about 400 hp. Some claim good results while others don't notice a difference. The problem with an insert is it doesn't prevent the stock open differential from exploding from wheel hop & if this does happen you could end up taking out other items with it & having a pretty expensive repair bill. A true LSD (Karking,Kaaz or Quaife) will runn you ~$800-1200. I do run a Quaife and even though its the most expensive, its still defently worth its price, feels like a completely different car when you get on it in both the straights & curves.

 

[copper_gst]

Thanks for your help guys. It will be a while before I will need a LSD because I get to (more like have to) rebuild my engine, but it is one of those things I want to have in the future. Thanks again.

 

[98evoIIIpwr]

I have heard a lot of "speculations" about the LSD inserts. As to weather or not they are true I dont know. I personally will be pushing way over 400hp when my car is complete. I will be running a SBR LSD insert. I guess I will have to take chances with it. If it fails I will get a shep tranny with a helical LSD. In the meantime I guess Ill bust a guinea pig and try this thing out with a lot of power. Besides I dont really thing HP will be the culprit in breaking it, torque would seem to me to be the suspect.

 

[FORMONTOYA]

Besides I dont really thing HP will be the culprit in breaking it, torque would seem to me to be the suspect.

You're correct that torque is really the culprit. However, in a turbo car torque and HP pretty much go hand in hand.

The issue is not really a matter of "slinging" the inserts so much as with the higher numbers the springs that are in between the inserts just can't hold up to the amount of torque/HP, especially if you get some decent traction, and will start slipping. Basically you'll have shavings all through-out the tranny which can't be good.

I have the SBR LSD inserts in my car and am one that would recommend them for a 300-350HP max car. Of course being FWD limits the amount of traction I'll get from it. And yes it's totally different to an OEM open diff and driving styles change accordingly.

But "stick with it" and let us know how it works for you.

 

[98evoIIIpwr]

I'll definetly keep you guys updated. I finally got all of the coolant lines squared away for the CHRA which took some time. I wanted a clean look so I went with some -6 AN fittings with braided stainless lines. Two weeks the tranny will be out to drop in the LSD and then shortly after the car should be up and running. Just got a few bugs to rid of and I gotta pick up a cheap laptop as mine had to be returned to my old job .

I'll be really pissed if this thing breaks on my first hard launch. Ill have to give it some time though as I am putting in a brand new clutch while the trannys out (SBR 3500) thats been sitting in my room for two months

It's hard to find time to work on the car with a full time job and a small business on the side. Wish I didnt have to sleep sometimes.

But yeah, like I said Im hoping for around 500whp so that should be the ultimate test for one of these puppies.

 

[Red97Eclipseboy]

As you can see over to my left, you know how HP and TQ I'm putting down to the wheels. With that being known, I'll tell you this. I'm running their LSD insert, and I have ZERO traction issues. I don't think I owe all of my traction to that, though. 235/45/17 tires, suspension, AVCR etc... Example: 17 psi, second gear, 4000rpms, WOT all the way to redline and no wheels spin at all. Hope that helps.

 

[98evoIIIpwr]

As you can see over to my left, you know how HP and TQ I'm putting down to the wheels. With that being known, I'll tell you this. I'm running their LSD insert, and I have ZERO traction issues. I don't think I owe all of my traction to that, though. 235/45/17 tires, suspension, AVCR etc... Example: 17 psi, second gear, 4000rpms, WOT all the way to redline and no wheels spin at all. Hope that helps.

What kind of 60' times are you laying down? That is if you have been to the track. With a good tune I should be putting down close to 150 hp more then what you have though. So this could make or break it.

 

[98evoIIIpwr]

Also, why arent you running more boost on that motor. It's built and the evo can handle 20+psi easily.

 

[Red97Eclipseboy]

As far as the track, I haven't really had time this year, plus, I'm not into drag racing so much anymore. Anyway, I'm only running 17 because it was more of a mild 'saftey' tune if you will. I know the internals are concerend, but there are other things to worry about; however, the way the car sits now, I think it is a perfectly balanced street car. The handling is there, traction is there, drivabilty, speed, everything. I may put some 104 in it and have AMS do a another tune, so I can have two files. My current street one, then a race file. We'll see. Good luck, man!

 

[Slowboy]

You're correct that torque is really the culprit. However, in a turbo car torque and HP pretty much go hand in hand.

The issue is not really a matter of "slinging" the inserts so much as with the higher numbers the springs that are in between the inserts just can't hold up to the amount of torque/HP, especially if you get some decent traction, and will start slipping. Basically you'll have shavings all through-out the tranny which can't be good.

I have the SBR LSD inserts in my car and am one that would recommend them for a 300-350HP max car. Of course being FWD limits the amount of traction I'll get from it. And yes it's totally different to an OEM open diff and driving styles change accordingly.

But "stick with it" and let us know how it works for you.

I have FWD customers running well over 500 WHP with this LSD (including my own car from days gone by) and AWD customers over 700 WHP using this LSD (including our shop car from two years ago).

We have also sold a few hundred of these in the past four years,

I always enjoyed my LSD in the FWD regardless of an open track day or a day at the strip.

Mike Huml

 

[98evoIIIpwr]

Thanks Mike, See I have heard so many speculations like I said. I was actually getting ready to call you guys and see what you had to say about it.

Everyone that puts this LSD Insert down needs to read that ^^^^^.

With that said wish me luck.

 

[KScivic]

I'll be running the SBR LSD with my TRE rebuild, we'll see if I can find traction...

 

[copper_gst]

I got a PM for one of the SBR guys and he said that they are running the insert in one of their cars that is pushing 500 hp with no problem what so ever.

 

[98evoIIIpwr]

Mike,

What kind of improvments did you see on your 60' times after installing the LSD? I know torque steer and wheel hop are also dramatically decreased, which also lead to better marks. Was it a drastic improvement? Any info on this or some timeslips before/after?

 

[Slowboy]

Mike,

What kind of improvments did you see on your 60' times after installing the LSD? I know torque steer and wheel hop are also dramatically increased, which also lead to better marks. Was it a drastic improvement? Any info on this or some timeslips before/after?

I never had the nerve to run a 500 WHP car at the track without the LSD.

With M&H 15 x 8.5" slicks I was able to run consistent 1.7's at the track.

It has been years since I had this car because this car is actually the black RWD now

Mike Huml

 

[eclipsegsx1736]

I've read a lot of info on these for drag racing, but how about applications in road racing/autocross/canyon driving? Or are the designed more for straight line grip? I'd get one if I knew it could handle track days and such.

 

[Slowboy]

I've read a lot of info on these for drag racing, but how about applications in road racing/autocross/canyon driving? Or are the designed more for straight line grip? I'd get one if I knew it could handle track days and such.

We only ever had this car out at Beaver Run one time for a few laps, so I could not give you a bullet proof answer. It is my opinion one would work well however, but like I said I have no real world expereince on a road course, as people do not want me driving on one

Mike Huml

 

[tegster1]

Would having this insert be beneficial when it comes to bad weather (snow, rain) or any insert for that matter? As you said, you dont have experience on a road course so I wouldnt think you would in snow either but anyone else have experience with this?

 

[nightspeed87]

Think im going to get a lsd insert when I get my jdm rebuilt tranny !
If you stiffen the motor mounts and rear struts and soften the front struts, and give it more of a raked stance youll have much less wheel hop ( for those concerned )

 

[98evoIIIpwr]

Would having this insert be beneficial when it comes to bad weather (snow, rain) or any insert for that matter? As you said, you dont have experience on a road course so I wouldnt think you would in snow either but anyone else have experience with this?

I think any added traction when driving in snow or rain will be benificial, so yes it will help.

 

[98evoIIIpwr]

Think im going to get a lsd insert when I get my jdm rebuilt tranny !
If you stiffen the motor mounts and rear struts and soften the front struts, and give it more of a raked stance youll have much less wheel hop ( for those concerned )

EXACTLY. Do this and run some nice sized slicks and you will own at the strip. A fwd with 500whp and 1.7 60' times is a monster. Think about the weight advantage you have over an awd platform. Not only that but your running similar 60' times your gonna have more top end and it costs less to make the power as it has less of a drivetrain loss. This is why im sticking with FWD to see what I can make of it.

I just wish more people felt the same way and actually put time/ money into their FWD's.

I think once I use up the whole "FWD" thing then I will be converting to RWD and trying that on for size.

No RWD DSM's around my area from what I know. Hell I dont even know how legal that is : p

 

[nightspeed87]

how much do slicks normally cost? Just curious because one day im thinking of trying them out at the track..