odurandina

monday's dyno test:


i dynoed the 968 @ ~ 161 mph when i hit the limiter with the tach reading just a tad over 6,400 rpm on a long, long straight on monday (in a midwestern state)... the car ran up to about 150 mph quickly where it encountered a wall of wind and the increase of speed slowed...


the last 7 or 8 mph took about 5 more miles of tarmac.... an eternity.



the interesting part was that the car felt like a brick, even with my lower lip having blown off on the last top speed run... this was my first time after installing the resonator. i might add that the sound this was absolutely incredible at top speed running the "od" exhaust w/ straight pipes hollow chamber resonator and maxflow muffler....


i'm running slightly over stock Dunlop 9000 275-35-18s which measure 25.65" at birth but now have about 2 mm of wear..... on interstate 80 i ran 129 miles of mile markers. and the odometer read 128.3 miles.



here's the bad part.... something started to smell horrible. don't know if it was the bearings on the torque tube, or the input shaft, clutch or what.... didn't smell good. no oil refinery smell so i know the engine was doing okay.



maybe the sealer from the gaskets from the recent 120,000 mile service, which included everything.... ???



well that's what happened. the tranny smells when you lean on it ! stay thirsty my friends.

IcemanG17

gears-smears...I only use two anyway..... 5.3 & 3.15 are all I need....however I would like around a 3.65 a bit better!

triplezero

wow! wasn't expecting this thread to "take off" like this... I think I got my answer. I figured the 968 box wouldn't fit without way to much trouble. Will probaly end up rebuilding the original worn out box, my intentions weren't to build this into a track car....However these "cars" have much more potential than people are willing to give them...Even my little 4.5 liter.

slate blue

Marc I investigated the 575 and 599 gearbox as they were relatively cheap, the major issue is the input shaft as it is offset. The drive axles would just bolt up, the gear selector maybe a bit of an issue too but not as big as the input shaft which is also low and needs to be higher. If the gears could be re-arranged, i.e a new front casing (multi piece casing) maybe that would solve it but that is a specialist job running into many thousands. The mounts would be that difficult to sort though.

Greg

mark kibort

No what?? I dont understand the response. did you mean to attach this to someone else's post?

I agree. if you are going to do it. better get a close ratio gear box from something that uses a sequential shifter! especially with a flat HP curve, most gear box changes wont help acceleration at all.


(I said: Originally Posted by mark kibort
Here is the million dollar question. Anyone know why that the 3.4 vs 3.2 wont make any additional accelerative forces at the rear wheels with a flat HP curve in that area? )

BC

I think money is better spent on taking apart a 928 transmission and figuring out how to make it stronger. I don't personally know how to do that, but I am sure its possible with enough money.

mark kibort

Ive used my 928 transmission for over 10 years now, with no issues. its absolutely amazing in my mind. the last 3 race seasons, have been with the stroker with up to 420rwT.

after I posted the reality of what a change to a 968 6speed would mean, as far as effectiveness, I would think the discussion would be over. there would be absolutely no gains at all with a 968 transmission in a 928 engine. gear spacing is two wide, matching the 3-4-5th of the 968 to the 2-3-4th of a 928. the generaly flat HP curve of most 928s would make any gear closeness of the 968 gear box, without advantages.

GlenL

My car has a rather peaky HP graph. Aren't most like that?

James Bailey

Glen I think most know that if Kibort does it then it is the best way...perhaps the only right way because Kibort does it...that is all that matters From the POC office re: Laguna Seca ..."R5: Mike Monsalve, Steve Parker, Athan Aronis, 1st, 2nd and 3rd respectively. I did see that Brent Smith came in 8th in a street legal 964. He started 8th, finished 8th, quite an accomplishment Brent!

Note that R5 was able to field 18 cars. Some new iron getting into the mix with the pre-89 911 cars, 964s, 993 and a 928 made an appearance. Even more spectacular, Steve Vandecar is back, same infectious grin, same great attitude....."

I wonder which gears the street legal 964 was using as he finished in 8 th place...out of 18 ?

odurandina

the 968 box can be fitted with a nice 5th gear that's about 1/2 way between stock 5th and 6th.


and 6th gear is even better news, w/ choices of stock 0.778, or 175 mph 0.680 or 195 mph 0.600.



these are good gears when running turbos or V8 chevy in a 968.