i have a 85 S15 with a 305 tpi into it from a GTA
i have 31 tires with 4.11 gears and a 700r4 trans...
if i put the pedal on the floor the tire would not burn just a little..

what can cause that?

the engine is ideling very well.... revving good...

 

Too much tire....plain and simple

 

on jtr manual they show a 350 tpi blazer burning 29 in tires on 4wd...
i cant make smoke my tires even in 2wd...

 

A 31" tire is huge even for 4.11 gears, 4.56 gears are a little better, or 4.88's

 

Don't forget, there are 2 sets of gears, the ones in the tranny and the ones in the diffs. What did the tranny come out of and how is it geared?
31s are a lot of tire, and they prolly have some decent tread; they are going to be hard to spin with anything close to stock engine/tranny/gears.
I had an 83 S10 Blazer that I dropped a 327 lightly tricked out and TH350 tranny... talk about a sleeper, I turned many a head with that. I just wish I still had the room so I could work on my IROC, I hate apt living.

 

Yeah, isn't stock like 26.1"?

31", even if its the stock width, will increase the contact patch a lot.

 

my Stock Factory Tires are 205 / 75R15...
now i have 255 70R15 ( 31 )
305 Tpi / 700R4 / 4.11 posi

last year i owned a 4.3 Vortec.. and this little engine was so powerful.. more than my actual 305 tpi.. and this 4.3 had only 190 HP / 260 ft/lbs

my 305 is suppozed to have 215HP / 290ft/lbs

so... the 4.3 was 3.42 posi ( 195 75R14... )
and this truck was able to make tires smokin at 20 25 mph... if i put the pedal on the floor...

my 305 isnt able to make it smoke stopped and then after floor it..


the truck is Stock! Engine is also stock...

 

http://www.jagsthatrun.com/Pages/Gifs/S10_Truck.jpg

that is a 5spd manual 305 Tpi...

seems to be more powerful than mine ;|

 

Problem is still in the size of the tire and the gearing. It's all wrong as it sits now. Also in a truck, there's less weight over the rear tires so it's easy to burn them off.

 

Oh yeah, I didn't notice that you were talking about a S15.

 

ive changed my exhaust setup tonight... i went from 1 x 2 1/2 to dual 2inch and the engine is mutch powerful ... i think the catalys were too restrictive... ( that was my cat from my 2.8 )
the mufflers are 2x Walker Pn:18154

i feel the difference... so...

also i have an engine driven cooling fan... i think using a thermostatic fan to replace my flex fan...

how mutch HP my flex fan can use? ( Flex-o-lite Pn:1518 ( 2 1/4 pitch )

 

Try getting a higher stall converter

 

that tire is actually 29" tall