Yea I know not another lo3 thread lol But heres the deal I have a lo3, auto with a 2.73 posi rear. I ran a best of 16.77 at 81.1 with a 2.45 60' with a flowmaster catback, open element on crappy bald 215/65/15 tires in hot humid air. Would I be able to break into the 15's with hedman l/t's 2.5'' duals with dumped bullets on my new 275/60/15 bfg radial T/A's in cooler air?
200th post

 

With a better launch (your 60' isn't very good) and those parts I could see you maybe getting into the high 15's. That's if your lucky. Add a set of gears to that list and I can definitely see you in the 15's.

 

well i'm not sure if long tubes are going to help you much,,,, what other mods have you done? going dual might not help either. You might get 1/4- 1/3 sec quicker at the most. if you want faster you need more ci.

 

A 3.73 Gear would help more than anything.

 

a carbed 350 should be the next thing to go in

 

so you want to switch to even taller tires and still keep that crappy rear end gear and hope to go faster? Sounds like you need a rear end swap to a 3.42 posi, then work from there. Next the exhaust is ok, but a engine swap at the same time would do wonders.

 

the 275's are already on

 

well then a rear end swap is needed since your 2.73 is more like a 2.50 with a 28" tall tire. I'd say 3.42 if not 3.73 at the bare minimum. Those LO3 motors are dogs though, sure exhaust will help, but you'll need to spend serious coin to make it a performer, might be cheaper to sell that car and buy a 350 TPI car.

 

Thatd net you atleast 2 seconds in the 1/4 ...

 

headers back exhaust and good rubber (assuming you can get that 60' down around 2.0) would get you into the 15's yes...

 

Would I be able to run some 4.10's and still be able to keep it a DD (its my only car)?

 

anything is streetable if u have cash

 

3.73's would be a better idea IMHO. You could get away with 4.10's on the street though.

 

Now yall have me wanting 3.73's more than anything. Whould these be the best next mod?

 

I ran 4.10's for over 2 years without any DD problems. Just a little higher RPMS when cruising but if you have overdrive or the 5 speed your golden!

 

yep, i had a 275/60/15 tire on my car with a 4.10 gear and was able to click off 15mpg in town and 22mpg on the highway with no issues with overheating or anything like that. the key there is to get a lockup converter or a 5spd, like izcain said. look into a converter as well when you do the gear swap.

 

If you want to take the cheap way, get a V6 rearend which has 3.42's in it and just swap the whole damn thing. I got mine for $100.

Also, get a 95 4.3l S10 Converter at a Transmission shop. I paid $75 for a rebuilt one. I also upgraded later to a Corvette converter which was only $100.

 

I just thought 3.73s would be better since I am basically a stock lo3 at least for the next 2 or 3 months then hopefully a 350 of some kind.
vwdave---- Could you please tell me more about the s10 stall, isnt it a roughly 2200 stall speed?

 

Mine on a L98 stalled at roughly 2000. The Corvette was 2200 or so. Thats on a engine with alot more torque.

Also, you do not want a huge stall in there. A S10 stall would be a great, cheap alternative to spending $300-$800 on a converter. Especially when youre not making tons of power.