SeanTimothy

im posting this in tranny section as well so sorry about the double post but it may apply to tranny as well as engine..



91 rs carbed 305 ported polished lb9's 2.73 2500 stall TC


now....im wondering if the reason i dont spin tires, is the 2500 stall not dumping power to the wheels until 2500 rpm and eliminates tire slip...which is a good thing....i was just wondering if this is what was happening...

the engine itself is mechanically fine, pulls hard, turns the car sideways going into second gear.....just wont spin the tires much from a dead stand still.....tranny has 3000 miles on it....

also the porting and polishing killed some torque as well...i know that...

so anyone have any ideas? or is my idea fairly accurate.

plugs, wires, dist, etc etc all new, fine...works properly....

zippy

i'd guess, the gear.

SeanTimothy

i know lots of people who burn the hell out of tires with the 2.73's.....with way less mods to their engine than mine.....i mean mine is FAR from stock, the only thing stock on the engine is the crank, pistons , rings and block. period....

Z dude

did it spin em before the stall converter was put in?

zippy

i'm not saying it's the only problem, but they don't help. what kind of times does this thing run in the quarter? any more specs on the car?

ede

not spinning is good

jimmy_mac

In the winter when the temp gets down in the 30s my tires spin like crazy. Can't get traction to save my life. In the fall after a rain when the road gets dry they hook pretty decent. And they act different at varying times during the year depending on temp, how dirty the road has gotten since the last rain,ect...... Point is sometimes it's just the time of year and road conditions.

SeanTimothy

yeah lik ei said, im not wanting to burn the hell out of tires, by all means....thats abad thing, i was just curious as to why i couldnt if i wanted to lol....

and yes it woulfd spin before the stall wa changed....but then again, ....the car was pretty much down for a month RIGHT after i put the tranny n tc in for the head swap and all that. so im thinking its a combo of the porting and polishing and the TC...

dimented24x7

iTrader: (2)

I take it you still have the stock L03 shortblock in there? The cam that came with those is pretty puny. The 2500 rpm stall is probably a tad too much for the engine. I too say its the gears. I have 2.77's and theyre the most *** awful gears performance wise, not to mention i still have the stock 1200 rpm stall TC. The engine bogs off the line and the shift points with those gears really suck, I shift the auto at 45 mph for 1->2 and 80 mph 2->3. At WOT I actually get beat off the line by ricers. Get slightly less stall and a better gearset and itll probably spin like crazy off the line.

SeanTimothy

ew od no i dont have the stock cam lol...Lt1 cam....the only thing stock in the engine bay is the block itself, rings, and pistons...nothing else....new tranny, new tc, stock drive shaft and rear end....

dimented24x7

iTrader: (2)

lol... ok... just wanted to make sure. In that case a good set of gears should help round out your setup.

91GTABird

I have a stock 91' lb9 GTA(heavy at that), stock 700R4, and 2:73 gear. I have noticed that bringing up the RPM's before i launch that the tires dont spin as much when i hit it from a 600 rpm launch. My theory is that im building "momentum" on the rpm climb. Try what i mentioned and then try stalling it at 2500 and see what you get.

p.s. I can spin both tires from a dead stop till bout 2500rpms and the RR tire through first.

SeanTimothy

are you suggesting a neutral drop??? emaning rev til 300 then slam the car in first and lay on the gas? er....you break fly wheels and other junk like that lol.....ill pass

EatFordShtDodge

i used to do that in the V6... all that happend was a tranny mount no biggy just 5 bux and a ratchet

Kingtal0n

like everyone metioned, its the gear and your engine combo.

It probably spun em before because you had low end torque..

now with the LT1 cam, bigger heads, and a ported intake you have lost your velocity as well as your breathing capability for low end.


same thing happened to me about a year ago. I had a 355, 144 BLOWER with 5 PSI of boost, 2.77 gears and 2400 stall... Could NOT SPIN em at all even if i wanted to... even under boost!

Problem was just a drivetrain mismatch. some gears, some better stall (2800-3200) and i was putting all 500 horses to the ground instead of all 50 horses right off idle.

i bet if you stick some 3.73s under that thing you will no longer be able to move the car without spinning em.

91GTABird

SeanTimothy..sorry but im not that dam stupid to try and pretend that my car's a stick. I stoped that when i was about 8 and my dad found out why he had to keep putting transmissions in my 4-wheeler. You really think i would try that in my $5k GTA?

SeanTimothy

hey i didnt say you were stupid......i just replied to what you said which sounded to me like you were doing neutral drops.

Powerlover

I had the same problem with my car before i converted it to TPI. I was running a HEI vaccume advance distributor. The motor ran good pulled hard, snatched the car sideways in second, but it would hardly chirp the tires off the line. Check your vaccume advance. You may not have enough advance in the bottom end of the RPM range. I didnt realize that was the problem till i was messing with my distributor one day after the TPI swap (changed distributors with swap). I just happened to suck on the vaccume line and got air instead of the diaphram collapsing to change the timing curve. Also check the mechanical weights in the distributor to make sure that they arent gummed up.

Hope this helps!!!!

SeanTimothy

also, afer the head swap, my timng has to be set super high to et the car to run right, im saying like 15-18 advanced....no sure what that means, perhaps the balancer slipped....who knows.....was just throwing that in as a FYI ...might help....

Powerlover

That just confermed that i think you need to check your vaccum advance....

SeanTimothy

dist is brand new , i know the mechanism isnt fault, hoses are brand new, and vacuum is present at the carb.

same thing happened to my tbi when i stuck it on my car after the head swap, wouldnt run right at all for some reason, despite checking every known part you could imagine, new sensors all over the place, new ecm and chip....nothing fixed its irradic and faulty idle. so i stucxk the carb on it, idles and drives perfect....other than not spinning the tires all to hell from a stand still....

i still wonder wtf was up with the tbi being faulty after the head swap....nothing was moded other than porting and polishing......everything came off and went on the exact same way.....

the world may never know.....

89RsPower!

u cant break flywheels by neutral dropping a car... its damn near impossible.. autos dont have fly wheels

SeanTimothy

autos...dont have flywheels.....? uhhmmm....then wtf is that giant gear doing on in between my tranny and engine.....

Error404

would that would be the torque converter? But I thought the flywheel was part of the engine, not the tranny, so every all engines would have it, right?

Powerlover

You are both wrong. The torque converter bolts to the flexplate (big gear) on an automatic transmission. The flexplate bolts to the crankshaft. A flywheel is only present on a manual car.

Error404

ahh, there we go :-)

SeanTimothy

thats funny, when i had to order my flywheel, everyone i talked to called it a flywheel, never heard them say it was a flexplate

SeanTimothy

and technically, the *flexplate* bolts to the t/c , no tthe other way around

Powerlover

UM, OK, YEA. I always put the put the flexplate on the torque converter before i put the flexplate on the crank...

SeanTimothy

haha, just making sure you were on yor toes