I have been trying to acquire a lsd for my H4 Del Sol si and have not been able to get one yet. I have recently heard that lsd's may not be needed in the lower powered H4 cars. What are your opinions on running them in H4 cars? Do you think that they will offer an advantage over an open diff?

 

the OBX quaife style diffs are going for 300 right now on egay and there offering a lifetime warranty on them. Since the only people on this board to have used it is a 500hp drag car and it's held up I have high hopes for when I do my tranny rebuild next year

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sans &raquo;</TD></TR><TR><TD CLASS="quote">the OBX quaife style diffs are going for 300 right now on egay and there offering a lifetime warranty on them. Since the only people on this board to have used it is a 500hp drag car and it's held up I have high hopes for when I do my tranny rebuild next year</TD></TR></TABLE>

I did not want to get a helical style lsd. I know I will be able to get a quaiffe lsd by the end of the month, but the question is do I even want to spend the money on one now?

Is it really going to induce that much understeer and is it going to be anything that can't be corrected with spring rates? I would think that any car could benefit greatly from a lsd regardless of low or high hp.

 

Everyone that wins where I come from uses one.

Find all the production/ITA/H4 winners and try to find some without it. I bet it's worth the money. It is for me.

It's also track dependent.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DMF &raquo;</TD></TR><TR><TD CLASS="quote">

Is it really going to induce that much understeer and is it going to be anything that can't be corrected with spring rates? I would think that any car could benefit greatly from a lsd regardless of low or high hp.</TD></TR></TABLE>

from my experience, adding the lsd, makes the car pull thru the corner a lot better than open diff, so it has less "understeer"

I guess I could considered low hp, stock LS motor, I feel the LSD, makes the car handle alot better, ive gotten so used to it, that I can't "feel it" anymore

 

From my experience as well, there's a lot less understeer with an LSD. If you got MORE understeer, why would you want one?

 

Danny,

From our conversation a couple of weeks ago I thought you ere having a push problem? I have extra springs if you would like to try different rates....

Beyond that re: LSD

Autocross...big help!

Where are you spinning your wheels at PIR?
T5/6 - ok it will help there......

At FIR??? I don't spin my wheels anywhere but then again I have LSD : )

I'm sure the LSD will help but I don't think of a LSD as a chassis tuning device.

IMHO get your suspension proper .....

Where/When is your car pushing? What turns? Are you trail-braking? What are your toe and camber settings? Spring rates? Tire PSI?

Send me a PM...of course a LSD is a +

Regards,
Paul


Modified by PaulB at 6:08 AM 11/8/2004


Modified by PaulB at 6:08 AM 11/8/2004

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PaulB &raquo;</TD></TR><TR><TD CLASS="quote">Danny,

From our conversation a couple of weeks ago I thought you ere having a push problem? I have extra springs if you would like to try different rates....

Beyond that re: LSD

Autocross...big help!

Where are you spinning your wheels at PIR?
T5/6 - ok it will help there......

At FIR??? I don't spin my wheels anywhere but then again I have LSD : )

I'm sure the LSD will help but I don't think of a LSD as a chassis tuning device.

IMHO get your suspension proper .....

Where/When is your car pushing? What turns? Are you trail-braking? What are your toe and camber settings? Spring rates? Tire PSI?

Send me a PM...of course a LSD is a +

Regards,
Paul


Modified by PaulB at 6:08 AM 11/8/2004
Modified by PaulB at 6:08 AM 11/8/2004</TD></TR></TABLE>

I was not considering getting one as a chassy tuning device. I had read that they can induce more understeer and this is why I started to question if I wanted one. If that was correct then I would be less likely to get one.

This basically came up from a thread in the nasa forums. Someone had asked about a lsd for a H4 car and there was a post that implied the benefit compared to cost was not worth it in the lower powered cars. Here is the thread: http://www.nasaforums.com/viewtopic.php?t=3418

Suspension is getting closer to how I want it. I should be on new suspension next month. I think I may be going with Advanced Design Shocks with 700-800 front and 900-1000 rear springs.

 

Not to criticize that guy, but...that's one opinion saying an LSD isn't good. I don't believe I have EVER heard something like that, other than from that guy. Again, from my own experience, the LSD is nothing but beneficial. If you want to give it a shot cheaply, try out that OBX one. $300 isn't bad at all, and it seems to be a decent unit, despite the OBX name.

Edit: I'm forgetting something though. You bring up the topic of necessity. I don't have experience with underpowered cars, so it could be that an LSD is not NECESSARY; however, that doesn't mean it can't help.

 

Even in my sub-90 hp H5 car, I couldn't imagine going back to the days before I got the limited slip. Understeer is greatly reduced, especially when one tire gets light for any reason.

 

There ya go. And coming from the H5 champ.

 

I thought that opinion was strange. I had never heard anything like that before, but I thought I would bring it up and see what a larger population had to say about it.

 

I have run the 2004 WCHC season without an LSD in my H4 Civic SI and done pretty well (3 wins, 4poles) so I do not think that it is a requirement to be competitive. But I have heard the same stories about how an LSD will reduce understeer so will install one after the season finale this weekend.

The question you have to look at is the cost versus the benefit. I believe I am at the point where the next logical step is to spend money in this area. If you do not feel you are getting the most out of car or driver now, perhaps the money could be better spent on additional track time (to improve driving skills) for instance.

 

This is all my opinion, but I would do an LSD before building the motor say if the funds were limited and you had to pick. If the engine was running fine (stock engine) I would spend the money on an LSD first, higher FD second, then the motor. That's just me and my experience. The cars I've driven have seemed to get so much more performance out of them from doing LSD and FD than a motor build whether it be a RWD or FWD car. I've seen cars with a quality LSD and FD with a junkyard motor whoop a car with built motor, open diff and no LSD.

I just think it makes a world of difference, I wouldn't want to go without it.

s