88GT Road Race car build with a 3.4TDC (Page 6/18)
Frenchrafe JUN 25, 02:34 AM
I don't know if this type of gear oil is available in the USA, but it's what we use in competition here in France:


The stuff is really good at keeping a stock gearbox alive when driving trackdays etc...
Also cuts down whine.
Only difficult thing is the gear changes when cold, but it soon heats up on the track!

Regards,
Rafe

PS I overfill my gearbox by about 500ml - just for insurance.

PPS The gear oil costs like 3 times the price of the normal stuff, but I think it's worth it. Loads of other racers seem to think the same thing as well!


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"Turbo Slug" - '87 Fiero GT. 3800 turbo. Sticky tyres. Driven hard!
https://www.youtube.com/cha...1wZvWQlkYxTjivW_0XNg

[This message has been edited by Frenchrafe (edited 06-25-2020).]

sourmash JUN 25, 09:15 AM

quote
Originally posted by darkhorizon:

First drive with no issues, runs perfectly stock.

However now that I have a car that drives like normal, I notice that the gear whine is pretty loud at very light throttle, and goes away completely off the throttle... It gets quieter if i put some more power to it.



Doesn't that sound like an indication of misaligned gears? Perhaps one or both mating surfaces of a pair have a wear pattern not meshing perfectly with one another? I rebuilt a rear diff and got the pinion spacing off so it does this.
darkhorizon JUN 29, 12:23 PM
Been quiet for a few days, really putting in some work on this car last week.

First off... Track day this last weekend. Fuel pump fix has it running ok, but still dealing with some low throttle misfires, and it seems like its a little down on power, but not much, feels a bit rich is all.



Managed to get the brakes COMPLETELY figured out. The willwood sized DTC70/60 pads are great, and needed minor grinding on the knuckles and pads to fit, as seen here. Also the pin slider holes were drilled out. These brakes combined with stock rotors and calipers are absolutely flawless, perfectly consistent, great bias with the 70/60 front/rear combined with the OEM bias valve. Extremely happy here, and I doubt I will be changing these any time soon. The only thing I may do is go for a 13inch viper rotor but only after I add a bunch more power than I have now.





Steering has been holding back some speed from me. There is a combination of worn out tie rod ends and a crunchy weird feeling rack that causes me to be very out of control when im turning in, which causes me to overbrake most corners so I can get turned in comfortably. Its a few seconds off pace of my s2000 still, so further development is needed here in steering to contribute to my goal of beating my s2000 times at my favorite tracks.

[This message has been edited by darkhorizon (edited 07-01-2020).]

Craig71188 JUL 01, 01:54 PM
Thank you for the update on the pads - that will help the budget!!! Also, regarding the gearbox, I have used (and intend to use) RedLine HD Shockproof Gear Lube. We have used it extensively in Hewland gearboxes for formula cars and sports ravers where we regularly exceed the rated torque capacity of the gearbox and it works very well. We have even used their light duty shockproof on shifter karts for autocross due to the repeated standing start shocks to the gearbox and again, no failures (other than a couple of chains!).

Sure glad you bought this before I have to explain another Fiero race car to the wife....
Will JUL 02, 09:39 AM
Great to hear you found something that works to your satisfaction on the brakes!
darkhorizon JUL 02, 02:30 PM

quote
Originally posted by Will:

Great to hear you found something that works to your satisfaction on the brakes!



Yeah, This needs to be some sort of public information for anyone that wants good braking performance.
Craig71188 JUL 03, 07:59 AM

quote
Originally posted by darkhorizon:


Yeah, This needs to be some sort of public information for anyone that wants good braking performance.



I am thinking that getting together (Forum/FB Group) folks actually road racing (endurance racing) Fiero's is needed to help weed out a lot of the "clutter". It's a small band and I have "corresponded" online with several. Seems a place to share data/parts/tech SPECIFICALLY related to road racing would help all of us faster.
BabyShark
Fieroline (and a sister team in the NW)
"Mender" - Canadien team on Champcar forum
Me (in Ohio - still building)
Yourself
And I know I am forgetting someone - and there are more out there.
Will JUL 05, 03:20 PM

quote
Originally posted by darkhorizon:

Yeah, This needs to be some sort of public information for anyone that wants good braking performance.



Would the pads fit unmodified with a little more grinding on the knuckles?

Have you used Porterfields on track?
darkhorizon JUL 06, 12:22 PM

quote
Originally posted by Will:


Would the pads fit unmodified with a little more grinding on the knuckles?

Have you used Porterfields on track?



Probably would NOT fit unless you modified both ends, you are already starting to get into the bolt holes and the pads are easier to grind so it only makes sense.

The porterfields are something I have never ran myself, and i've heard of MAYBE one of my fellow track people ever use them before, and had an average review of them. They might work fine but its not something I would be interested in testing.
darkhorizon JUL 08, 01:45 PM