mark kibort

UNREAL. i dont think i have been this jazzed about any repair or performance mod to data. a PITA Job, but well worth the fight.
these things practiclaly fell out on my head once i got the bolts out

new bushings installed and after a test drive, it feels like a completely different car! steering angles are probably 45 degrees better. CRAZY!!

Many thanks for the tips, DrBob and others. that allen head wrench trick to stop the tops of the hex bolts, was a deal saver. 2 of them were unreachable by the the box ends.

read for laguna seca with the new car!!

rcrone928

Hello Mark. I just did this to my 83 euro a month ago and car drives much better. I had an impact driver adopter with a hole in the ratchet end that I could drop over the nut and stick a 3mm allen into the hole to hold the adopter from turning while wrenching on the bolt.

DeWolf

What did you replace them with?

mark kibort

I used the after market delrin replacements.
i could leave the rack on the car and work around all the obstructions. didnt even have to break out the power lines and tie raps.
was going to use aluminum, but the race is in 2 weeks I had one shot at this installation and couldnt take any chances with a delay the aluminums might cause.
Thanks to Mark at 928 intl for the quick delivery.

Rob Edwards

What other PM do you have to do before the next race?

Tony

Lower left looks like a venturi. you sure you wanted to take that one out??

Randy V

Kibort, damn son, you ain't learnt to keep a lower profile by now?

Jayzus.

Next time will be foerver...

mark kibort

haha!

I thought this was a good post for fixing a very loose front end, if anyone feels like their car is a bit sloppy up front. . Was this not an appropriate thread?

changed front pads and bled brakes , replaced rear rotors and amsoil oil change before last race.. checking the TB tension , as it was new before last two races..... wheel bearing needs to be tightened up on passenger side. other than that... i think thats it. oh, buying a new set of tires for Laguna (second set since 2001) my used sources have faded.................plus, its more fun on new tires and then the practice tires are better when they get demoted!

Captain_Slow

Mark - The thicker shoulder on the Delrin will lower the rack a bit. The upper half of the bushings causes the lowering, if my memory is correct. You should notice your steering wheel isn't level or has changed. Might want to check your alignment. I leveled mine by pulling the steering wheel and repositioning it. But to do it right one needs to pull the small black plug on the rack and look to see if the detent in the rack is centered over the hole. There's a special Porsche bolt (or you can make one) with a pointed end that goes into that hole and fits into the detent to hold the rack centered while an alignment is performed. Then the steering wheel can be positioned properly. On my to do list after I replace the shocks.

928NOOBIE

I did delrin in my car...I don't track it but I can testify to the change in steering feel and directness..it was definitely a huge and welcome difference.

What I had to deal with until I put Carl's lower frame brace in was pretty much everything presenting itself to the steering wheel...a little too much steering feel for me.

I do love the difference the delrin's make on the directness though...

mark kibort

I noticed about the thickness of the bushings tops, as the amount the rack is lower. not bad in my situation since my car is slow low anway, and helps angles, very slightly. however there is no reason i can think of where one side would move more than the other, making the wheel set up off center. its dead nuts on, so its either lucky or i was off before and didnt notice it due to the slop in the mounts. anyway, toe looks good... (about 1/8" toed in) but i think the main thing will be the fact that the tires will be always in mechanical alignment so the tires will wear much better.

FredR

I take it your steering wheel now points in the same direction you are travelling- ha ha!

I am surprised you did not feel considerable "slop" in the steering response but I suppose when racing you are at one extreme or the other and not much inbetween - that and all pumped up with what is going on around you- quite an adrenaline rush I would think.

Rgds

Fred

Carl Fausett

Mark - keep your eye on your Delrin bushings. Delrin will migrate under heat and high loads and the holes will become ovate.

Delrin probably good enough for some street driven 928's, but not a performance enthusiast and certainly not a track car.

You can see some elongation of the mounting holes of the Delrin bushings in these pictures as my customer was removing them to replace with our solid mounts. His is a street-driven 928, so this deformity occurred without a lot of side-loads like those in your car will see.

Carl

mark kibort

Carl, I was VERY concerned when i got the bushings. i thought they would be more rugged looking and they look like toy plastic. of course, they are going to be a world of difference vs the blown out bushings, but the stock stuff is steel outer, rubber center and steel center ........ these look like they will get crushed and think you might be right here. (for racing) I guess i didnt think this one through.
oh well, i got really good at doing it with the rack in place. removal would be a pretty easy task....... for a re-do.....

thanks for the heads up and i might be calling you for the replacements.

Mark

mark kibort

You know it was funny, i just thought it was the car. compared to my street car, i just thought the 928 was older and there was more slop. i didnt notice it too much on the track, because you are always pressing on the limits left or right.... (as you say.... i just noticed you said the same thing.... as i was responding to your first sentence!)
so yes, on the track, not much to notice.... but i have a feeling the handling is much worse, due to the amount of tire movement between the tires. the handling is not only more tight, but more crisp too. Ill see in a couple of weeks at lagunas race how much better it handles on the track.. with new tires too.