ttaddict

its all stock 89 came with lower gears 2.54 i believe but i retuned the trans so full throttle upshifts happen at about 6300 rpm and firmer up shifts. it will now lightly squeal the wheels when it hits second gear. it made a huge difference in the way the car performs it killed my craving for a 5 spd car.

inactiveuser1

Once I go back and see what it runs since the LH computer is now fixed then I can get the upgrade kit for the firmer 2nd to 3rd gear.Did you use the MB spring kit or an aftermarket kit that was a quicker shift than the MB spring kit?I will do one change at a time so I know what each change does.
Mark

ttaddict

it was an aftermarket kit i just replaced 2 springs for 1-2 @ 2-3 accumulator they use stiffer springs

inactiveuser1

So far I have seen the other link of
http://www.bulkpart.com/Merchant2/me...de=722-3vbkits
Any link or make and part number?
Mark

ttaddict

thats the kit i used my supplier got it for me said it was the only kit he could get for this trans i didnt realize till i opened the box that they try to soften the 1-2 shift i used the recommended spring for 2-3 acumalater but i improvised for the 1-2 i just used a stiffer spring in the kit meant for something else i had a scale and compared the tension of other springs to find something a little stiffer then what was originally in my trans although now i dont remember which one i ended up using but i got lucky the first time it shifts in my opinion perfect.

inactiveuser1

Yeah I didn't notice it either the 1st time I read the kit about the 1st gear shifter softer.I could check it with the scale and throw some dial calipers on the coil to check the springs also for the 1st gear.We do also have a MB dealer on the same road as the P dealer,will call them also to see what they say on the 1st to 2nd gear.Not that they will know but will call to check. 8.8 in the 1/8 is a pretty good run.
Ever think of going to a different converter later on?Some claim over 2,500 rpm may be too much.I had 1 street car that had the full manual valve body in it with a small converter.On the full manual valve body whatever gear you put it in it stayed in.To test the flash speed they claim to put in 3rd gear at maybe 5mph and floor it watch the tach it wherever it would go to before the car starts to accelerate was the (flash stall speed).I could hold it at 3,500rpm while in 1st gear and it would leave at 5,200rpm! that car ran 7.06 in 1/8th. 60foot times were 1.53.Since power comes on a 928 above 3,000rpm,something that would hold at about 2,500 and leave at 2,800 would be nice but not sure how it would be under normal driving as in highway cruising.
Years ago I had an older program and with knowing the 1/4mile time my car should of ran 9.6's in the 1/8th mile
Well I took that info changed the gear ratio in the program from 2.20 to 2.54 and also changed horsepower from 316 to 346area considering computer chip,x-pipe exhaust and it should run around 8.85.I never worked on the car as was racing the bikes and other things.It was interesting to see your car run 8.8 with the 2.54gears in it as I will attach that old paper which is what it figured out to be.
Mark

inactiveuser1

The animation never worked on the avatar well here is the regluar version of it for some laughs ,I drew it up years ago pro tree too
for the 9.90 class lol

ttaddict

so the printout you included thats a computer program prediction or an actual result you achieved. it is close to what i ran but i believe the 89 had a looser converter i think mine stalls around 2200 rpm and my shift points now are about 6300 1-2 and about 6100 2-3 mine as far as i know has no chip
[or maybe it does] stock exhaust except rear muffler bypass. other wise just tuned out some simple bugs like ignition and cleaned injectors. and did a proper wheel alighnment. you wouldnt believe how a slightly bad alighnment can drag you down. when i first got my car i felt it was'nt quite as sharp and nimble as my 86 was and first drag runs were pretty disapointing after going over the car and discovering and correcting the alighnment that alone was worth almost 3 tenths in the qtr times went from best of 14.6 down to 14.4 flat.

ttaddict

i thought i would try to atach a file to see how it works and i would show you some of my best runs with a gtech, the first run would have probably been my best run but it was cut short by the driver in the next lane blowing his frt tire unfortunatly he was in frt of me and i backed off becouse he was coming into my lane, drag prepped 80's mustang with bycyle tires in the frt and one blew.
these were run at island dragway and usually pretty close to what there clocks say.

inactiveuser1

On the old computer system it was called 1/4 junior.It was an old DOS system,.I left a friend borrow the disc and he lost all the info on the disc.I would think there are systems out there like that now.I 1st set up the 1/4mile that the 87 s4 ran according to the owners mnaual which was around 14.7.I had to adjust weight some to get the numbers to match the 14.7.Once you get the base setup like that then you can change converter stall speeds and gear ratios.Also you can put in alittle different horsepower as if you were adding x pipe etc for maybe 15 or 20 horse and try the printout again to get an idea what the car will run.
I did just have a rack put in and alignment with the rebuild LH so hopefully when I take it back it runs better ET.Then from there I can change the springs at some point and see how much improvement it makes.If not going to a supercharged car I would think a good higher stall speed converter could take off a few more tenths in the 1/8th.Some of the supercharger cars looked to be running low 8's to 8.4 in the 1/8th.You're at 8.8 now a converter may take off a few more tenths could bring it down to 8.5area which would be really good.Hopeing for 9.3 to 9.4 and maybe after the shift mods get closer to 9.0 to 9.2 area.After that its either try more gear or leave gear alone and go with supercharger.Still a car with 150 top speed with more gear would be more usefull than something that tops out at 170 with less gear ratio.Whats the highest numerical gear 2.73 area?
Mark

inactiveuser1

Heres the link of the 1/4 junior
http://www.quarterjr.com/quarter_jr.htm

inactiveuser1

Way back in 1998 is when I took it to the track.Most likely I took off in drive so it may of took off in 2nd gear as I didn't know then that taking off in 2nd it would leave in 1st.It would bog or hesitate some then so now that the LH is fixed by Rich it seems to take off much better.Before I change the spring for 2nd to 3rd gear going to go back again to see what the car will run 1st.Tuesday/Friday nights they give out time slips.Wednesday nights they only show the board with et.Either way as long as I get another run before another change is what I want to do.When the car went 9.58 another run it went 9.589 and 9.597 within 3 runs it only vaired .017 which is less than 2 hundreds of a second it was very consistent.Couldn't get a good light thou with it hestitating back then.I did try an earlier leave but red lighted lol.
I also ordered the 2nd to 3rd gear spring today from MB
Some of the older shift kits on some cars they would just shim the spring also to give it more compression but too much it could coil bind on a stock spring.
Heres the et slips from back then
Mark

inactiveuser1

Made it back to the drags today.It was street cars,bikes more of a big street night meet they now have every Wednesday night.The best run was a 9.60 so within a couple tenths of what the car did back in 1998.The 2nd to 3rd gear spring will have no effect in the 1/8th as I never get into 3rd gear,that would help of course in the 1/4 mile.There were some newer Nissan 350Z one of the faster stock ones went 9.75 seen later model vette maybe around 2000 run a 9.57
The 2.54 or even a 2.73 area gear with LSD and higher stall converter would probably wake it up some.What do the 1993-1995 GTS car run in the 1/8th?
Mark

ttaddict

i think you need to ck other things on your car its not running right. i just went through my other timeslips for other cars i have and found from 03 when i had my 86.5 928 auto 90k miles that wasnt quite right, heavy rear a/c, and a soggy topend didnt pull clean to redline like it was running lean or timing retarded i never got to finish tuning it a buyer popped up so i sold it. but that car not quite right did consistent 14.4 qtr w/ 1/8 mile at 9.5 right around 80 mph. your car is only doing 77 mph and its an s4 something isnt working right.

inactiveuser1

Could be timing/cam timing not perfect.Last night was 9.60@78mph temp out was about 85degrees.Ken looked like he had a nice setup of adjusting cam timing.When I did have the old 1/4 junior I put in the info of the 14.70 quarter mile as they claim in the owners manual.It printed the sheet with the 80mph but it did show 9.63 in the 1/8th which the ET is there.I used the same progam for my drag car it always said a few mph than the car ran.Over time things like injectors migth not be 100percent also.It would be nice if we could see some other guys take there car to the track just to see what they run.I will attach that old page underlined is what it claims the 660 1/8th mile from putting in the 1/4th mile times.When I went you could hear the tires chirp alittle of the start as it isnt posi-traction so it may loose just alittle there.Converter only seems to go to 2000 on the start.
Mark