You need to post this in the road racing/auto-x section.

Griggs is one of the oldest companies but they aren't known for their customer service or timely feedback. You may want to look at Agent 47's SLA.

Do you have ideas about sorting out the rear suspension?

 

I was going with a built IRS. Ill move this to another focus thread. Thanks for the input though.

 

Griggs and Maximum are THE names in "proper" Mustang suspension systems.

I went with the full boogies Maximum Motorsports kit when re-doing the suspension on my 1993 GT, mainly because of simplicity and cost. If your planning on road racing competitively, then the SLA Griggs setup would be ideal. Or if you are planning on deleting the strut towers to make more space for that Coyote motor. Otherwise it will be money blown.

I went with the forward offset control arms on my car and other than some fender clearance issues (now cleared up with the MM write up on how to modify the fenders) everything went on easy enough.

What brakes are on the car right now? What are your plans? Heck, a "road and track" box from MM is more than enough to "modernize" the suspension on your Fox and still have money left over for other goodies.

 

An SLA is a hardcore setup and the cost could only be justified if you were trying to make money with the car.
Other than that, lots of success with standard MM products and your wallet won't take suck a big hit.
The quality of parts over the last 30 years has changed, but the technology of design is still used on new cars today.

 

Its a lot of fun!

Notice how my front wheel was pushed into the front fender area. Its since been remedied. I'm currently not running a rear sway bar but not sure if thats how it'll stay or if im going to go with MM's adjustable rear bar. I didnt have much issue with the flowmaster tail pipes fitting but to drop some more weight I may end up going with dumps shortly.

 

Griggs has been around forever it seems. Great stuff.

Also, I would certainly not call Maximum Motorsports "cookie cutter" products. UUC, sure. But not MM.

You want modern? How about this. 1987-89 Mustang Maximum Grip Box

As tested in the 1/15 issue of MM&FF. One suspension. 1.39 60' times at the strip, 1.06g at the track. That's getting it done.

 

I have the entire gr-40 setup,,,,,,SLA will be in the future....haven't raced in a long time though.

 

Thanks for the input guys. I considered the Maximum Motorsports route for months and they just don't impress me that much or add the aspect of performance I'm looking for. They do make some quality parts though.

On another note; I'm building this car in such a manner that no one will walk up to me and say "Hey I have that exact setup". And not to sound like an overly pompous phalli, but by the grace of God and education, money is not an issue right now.

SLA systems are not expensive just for the point of being expensive, it offers exponential benefits over the ancient McPherson setup, and I'm willing to pay for that quality of performance. And to reiterate I want modern cutting edge technology in the shell of an 89GT.

Iv been reading alot of people are having problems keeping in contact with Griggs for support. For instance I NEED to know how my Coyote will sit in the bay with the SLA in place, numerous voicemails and Emails have received no responses. Im also looking into the Agent 47 setup, but again multiple variables need to be worked out before that commitment is made.

My next issue is building the IRS. Anyone ever deal with Full Tilt Boogie?

Thanks yall:salute:

 

My next issue is building the IRS. Anyone ever deal with Full Tilt Boogie?

Thanks yall:salute:

You'll find plenty of info about the company and from the owner Bruce over on SVTPerformance.com. FTBR makes quality products but the install is more involved than the MM kit (again, if we're talking about building an IRS here, not any SLA-style setup) so be prepared for that. They use Delrin in all the positions and MM uses poly for the IRS subframe mounts and delrin elsewhere, and you will find PLENTY of info from people that have used both and said the FTBR was too rough, just right, that Delrin shouldn't be used in the subframe mounts, there are tons of opinions.

If you are going with an IRS setup then obviously try for an 03/04 setup, followed up a 01, then finally a 99. If you use a 99 or 01, make sure you get a 03/04 front diff brace or an aftermarket one made by Kenny Brown or others. On any IRS you will want to get a diff cover brace, especially if you are doing anything with slicks or you'll hear some loud crashing and see this under your car (not my car, but it looked just like it):

 

I still don't understand what you are trying to achieve.

Do you have any data showing that a Griggs SLA equipped car out performs a MM equipped car. I am not necessarily challenging you, I am just curious if there is support for your "cutting edge" technology statement.
I could see spending the money if it actually out performs the other, but if the difference ends up being driver dependent I would pass and put the money elsewhere where we know the technology has improved.

 

As far as breaks I haven't gotten that far in my plan yet. I'm going to be using the hydroboost system with the Coyote so I imagine that I have some options. If I had to make a decision today I would just go with the 04 Cobra setup, but their is going to be upgrades in the future, most likely its going to be Brembo or a Bear setup I'v been researching that really looks superior.

 

I'm tiring to achieve something unique that outperforms any McPherson setup by leaps and bounds. Plane and simple. If it's evidence you want compare cars running McPherson with a car running a double wishbone. Times have changed my friend, you wouldn't use an IBM from 1995 just because it still works would you. There is always something better out there.

Also and more importantly, it's just what I want to do.:salute:

 

If you want to spends lots of money to be different, then by all means go for it.

I am still interested in seeing performance differences from cars racing in the same class. If the SLA was leaps and bounds better I would imagine that you would not see any mcpherson setups at the racetracks.

 

Well Im buying a complete 04 Cobra IRS off an old friend and also picked up a new Torsen t2r. I think that's my best option after I build it up with all the Full Tilt Boogie goodies.

Thanks for the advice

And WTF happened to that diff to scatter it like that?

 

When you get wheelhop it puts stresses on the diff cover face, because the rear mount of the diff is mounted on it. In fact the site that I linked that pic from is BilletFlow: Home of Premium Billet Pulleys, Throttle Bodies and Accessories and was the original IRS cover brace but they are made by at least Steeda, maybe others, but Billetflow is still cheaper (moneywise, still great quality and is what I have on mine).

Whenever my stock trak-lok goes out I plan on getting a Torsen, as heat buildup is bad enough for the diff but using clutch packs makes it even worse. Anyway, what made you go with the 2R vs the 4R? I'm not close to doing it yet but still curious as I know they make both.

 

Im kind of set on the 2r because its native to that IRS as well as the 4.0 torque bias. I my be wrong but the 4r is more native to offrod and 4wd pplications, but agin this may not be the case. To tell you the truth I really don't know as much as I should about diffs, lockers, all the clutches and stuff involved.

I rode in my neighbors car who I'm modeling my IRS build off of and he had the T2R in his car and man when that thing went around corners, fast, it was downright frightening because I was so used to my fox just breaking loose.

I should probably do more research on the diff before any moves are made, If you were in my situation putting an IRS into a tail happy fox what would you recommend? (Pretend everything is free and money was never created)

Thanks for your input, maybe ill give Eaton a call today and see what they have to offer.

 

Right, and their also AWD and not three decades old. And as far as me spending loads of money to be different, yea that's what I'm going to do. Sorry if that bothers you. You think you guys would be supportive of a community member tiring something different, but all I get is hypothetical "what if" logic. If its evidence you want, use that thing called Google and find it yourself. Or just go for a ride in a SLA car, I bet your tone would change real quick.

 

Don't make conflicting statements if you want more support.
We are definitely pro you blowing money, so go for it.

Just don't make the argument that you are doing it to be leaps and bounds better then everything else. You made the claim, not us and Google does not support your claims.

 

Oh, I dunno...

New BMW M4, 1 example. RWD. MacPherson. How many cars driver better than one of those? Not many. Porsche 911 would be a competitor you could put in that same spot.

Also of which is RWD using a Macpherson up front.



Nobody is trying to convince you what you're doing doesn't have the opportunity to be better. Just that, for whatever reason you're selling the MacPherson strut design short for some reason.

 

If you want to increase your front suspension's performance you can still do other stuff before going with a SLA setup, such as coil overs (even in stock location), offset a-arms (pics above from someone), etc. The performance increase you get from doing the SLA setup might not be worth the cost on a street car.

 

It is fairly common knowledge in the racing circles that a vehicle that switches from a strut suspension to an SLA setup will improve lap times. I beleive it allows you to run a larger front tire too. However, as DuffManRHA notes, the performance differential may not be worth the cost for most street car owners. A two second reduction in lap times is huge for a race car. Not so much for a street car. The OP wants something different utilizing high end parts. We see that a lot here on this site. I say have at it and show us some pics when you get there.

 

Are the prices that big of a difference?

 

$5K for a street system and $10K for a race setup. That is only for the front suspension and does not include the rear.

Griggs Racing Products

 

The new BMw M4 and 911's aer exactly that, new. Also carryig a heavy window sticker. They have spent millions in man hours with the best engineers on the Earth to make the system work damn well, and indeed it does. I don't think Ford was doing this in the 80's, they were working with what they had and di the best they could.

I'm not looking for improved track times, I'm not looking to shame McPherson systems. What I am looking for is a unique fox body that few other people have that I can call my own.

And as far as evidence again obviously its going to very from vehicle to vehicle. But can you honestly tell me a McPherson is superior to a double wishbone? C'mon mate get real.

 

Yes, technically it is a better design if that makes you feel better.
A street car won't notice a difference and the only ones that will are the hardcore racers that have a dedicated track car.

If you are looking to be different, don't rule out an airbag system as those can be setup real trick as well. SLA or airbag setup would be pretty unique.
As an enthusiast I whether see you spend your money on a sweet twin turbo coyote fox setup. I would give that three thumbs up. Hahahahaha

 

I think one of the newer centrifugal superchargers would do just fine if I need a little more juice. I'm defiantly sending the 4v heads out to Fox Lake for some port work, valves and springs. Then some type of mild cam(s). I want to see how high I can get one of these things to rev consistently and safely. If I have to go dry sump, so be it.

 

And to 2001sleeper, what conflicting claims did I make? And copy/paste the quote where I said SLA is leaps and bounds better than whatever McPherson fox system is out there.

I don't understand how you can make this argument if you have never ridden in a fox with a coyote, SLA, built cobra IRS. Have yu ever done that? Personally I have had a full MM setup with coilovers and it dident impress me that much, so its time for something more advanced and better. Again, sorry if that goes agaist your McPherson idols.

This is so typical of Corral. People who write books but cant even read.

TO the posts that were actually constructive, many thanks.

 

I saw this last night and got thinking....why would sla be more rough up front? I have an 87 vette and that has what i believe is sla. It handles smooth as one could want for a sports car.

 

It's prob more rough because since its a setup used more on performance and offroad vehicles that they are more apt to use a stiffer spring setup. It's actually pretty similar to the IRS setup on a vette so if you can envision that its pretty close (minus the driveline of course).

 

I have the full GR40 kit with the SLA, torque arm, panhard bar and frame kit. I also bought their 4-on-4 disc brake kit. It's overkill for a street-driven car, but I knew that when I got it. I had the cash and I wanted something different so I bought it, installed it, and I have no regrets.

If it's something you want I say go for it, I think you'll be happy with the result.

I sent you a PM too.