ls2 bait

iTrader: (11)

im in a bit of a pickle. as my car sits right now i cant make it thru the traps under throttle. but it is very very close. i have to let off just before i trip the lights as it bumps the limiter at about 142. 7k rpm. it has a 4.10 gear in it right now and i have a dana 60 so my next step is a 3.73 which is a good jump down. im afraid how bad this will effect my motor runs on the 28" tire.

so basicly i can either bump the rev limiter a few hundred rpm which the motor should be able to take without any issues but its not making any power up there. or drop to a lesser rear gear. i would also like to cross with the nitrous active-it currently is shutting off about 134 with the window switch set at either 6500 or 6600 i forget....so lets here some opinions.

Gen414

iTrader: (38)

Well, first of all, I would look into a 3.80- 3.90 range for a gear set, just to make sure. .
If they don't, which they may not, I feel that with the power you are making on spray, the 3.73 would still get teh job done. Even on motor, I feel that you are making enough power for teh 3.73's and 28". Might not be optimal on motor, but still should be good to go.
Also, do you not want to get rid of your limiter? Go faster? I mean, if there is a reason for it, share it. If not, get rid of it, and keep teh 4.10's for teh time being.

Also, you said 142 in one part and then 134 in another???

Old Geezer

iTrader: (3)

W/ that much RWHP, I run that same et/mph with a 3.42 gear and 28" tires. [3710#] But, then it's only a v-sicks..
I'd try the 3.73, and see if the performance is as good, or may be even better.

ls2 bait

iTrader: (11)

the ntrous turns off via the window switch at 134. the car hits the rev limiter at 142. the next step down ive found for a dana is a 3.73. its a stick shift car too btw forgot to mention that. and heavy as all hell.

ls2 bait

iTrader: (11)

bump?

xpndbl3

iTrader: (23)

shove a taller tire under the car, try a 29x9 or so. Or drop down the gear size and use a 27" slick for motor runs and a 28" for nitrous. etc etc

Z-RATED94

iTrader: (6)

I agree,two sets of wheels/tires would be the way to go. Otherwise pick which set-up you want to optimize.

BigKap94z

iTrader: (47)

Cheapest easiest thing first....bump the rev limiter up and see how the car reacts. If power falls off that bad im quite sure you will know it by the end of the run. If it slows up then u have the option of stepping up tire size, or going down with the gear.

gator's 99TA

iTrader: (2)

IMO run it out the backdoor to 7200-7300 rpms and run the nitrous to 7100 rpms. shift where you had been shifting, but just let it ride out through the traps. its much better than being on the rev limitor IMO. its only for a few moments its at that rpm and your motor is balanced and has plenty of ability to sustain that rpm for just a few moments (or much longer). IMO there is no reason to shut off the nitrous that early if you are continuing to make power.

running a smaller gear will really make your car less fun to drive on the street and a bigger tire takes a lot of work aka mini tub/hacking. i doubt you want to do that with a clean show car. also for as little as you race your car at the track and at those rpms, you will be fine. if you went rounds every week, i would suggest running a taller tire/smaller gear.

or you could just be slow like me

JL ws-6

iTrader: (50)

Bump the rev limiter to 7400, turn the nitrous off at 7200 and let it eat.

1bdtrk

gears arent expensive, try the 3:73 and spray to 7K.

or on a seond thought, you could just bump up the rpm by 200 and spray the whole way.

TA1364

iTrader: (11)

If you are turning the nitrous off at 134(whatever rpm that is), just bump the limiter up. If you spray it to the finish line you might need 373s

ls2 bait

iTrader: (11)

ya i am def not cutting the car up. not at this point. maybe if i get serious with it one day but not now. i think im going to let it run out. i think its going to hurt me too much on motor with the 28" tire to drop to a 3.73 and having two sets of tires is a pain in the ***.

gator's 99TA

iTrader: (2)

for as much street time as that car sees, and little track time - the 373 will dull down that car big time. besides a 28x10.5 et drag is enough tire for 8.90s all day. you dont have a problem hooking, so keep the tire. i refuse to put on a big tire on my slow car

LS1 SPEED

iTrader: (22)

raise the rev limiter

raise the window switch

get some new tires

This is my suggestion to test the car this way before making a gear swap.

LM97Z

iTrader: (4)

What i would try 1st. is raise the limiter, make a pass, then raise the window switch, i'll bet once your done playing with both, the car will go faster ET & MPH, it does seem like your kicking the nitrous off too early, if you feel that the engine won't be hurt winding too 7500, set the limiter @ 76-7700, then start increasing the window switch in 200 rpm incremments, you may end up crossing @ 7500, but the Nitous will take you there, even though the engine quits making power @ say 7200.

Unless i missed it, what RPM are you crossing at now the way it sits at 142??

ls2 bait

iTrader: (11)

limiter is at 7k now. it hit it right before the end.

1bdtrk

Well sounds like all youd have to do is bump it to about 7300 and youll be straight...unles you wanna go faster, in which case you will need to bump up the window switch as well.

LM97Z

iTrader: (4)

I got to playing with the calculator.

4.11s with 28" tire:
6900=140 mph
7000=142 mph Right there is a ploblem, your trapping at 142 @ 7000, you have the limiter set @ 7000, i would raise it to 73-7400

Now if you raise the window switch to try & go faster (say 7-7100), you'll most likely trap more MPH, & then you could raise the limiter to say 7500, heres what it said if you dare tread that high.

7200=146 mph
7300=148 mph
7400=150 mph

Now if you were to install 3.73s, this is what will happen too the trap RPMs if you trapped the same MPH.

3.73s with 28" tire:
6300=142 mph
6400=143 mph
6700=150 mph

94 guy

iTrader: (125)

what rpm would he cross at on the motor with 3.73's and a 28" tire?