possable gear change. opinions?

[tayzoid1]

off the bottle my car is going through the traps at about 5400 rpm. the motor doesnt like going above 5500, this last time going to the track i turned a 12.7 at 111.9 and was turninbg about 6500. on the bottle off the juice its about perfect pulling almost redline as i go across the line. but on the bottle its running out. im not wanting to turn this factory bottom end that high and not going to do another intake right now for reasons left to be unsaid.

my setup is in my sig. bandit swears by the 4.10's in his car. but, imho im running out of gear on the bottle. i think a quick fix would be to put a set of 275 60 15 et streets on there. as apposed to my current 265 50's does anyone think i wil notice a big diffrent on the big end from the height diffrence of the two tires? or should i just break down and redo my gears and go with a 3.73? i was thinking 3.90 but i dont know if there will be much improvement going from 4.10's to 3.90's.

any imput guys?

[SlowJoe]

U will see alot with a tire change. i think Matts car is heavier than yours

[QWKSNKE]

if you are not spinning above 5400 rpm, then 4:10's maybe a little steep. I loved the 4:10's in my car but I was spinning my 306 to about 6300 rpm on or off the bottle.

[QWKSNKE]

if you are not spinning above 5400 rpm, then 4:10's maybe a little steep. I loved the 4:10's in my car but I was spinning my 306 to about 6300 rpm on or off the bottle.

[TheJeanyus]

if you are not spinning above 5400 rpm, then 4:10's maybe a little steep. I loved the 4:10's in my car but I was spinning my 306 to about 6300 rpm on or off the bottle.
:stupid:

What heads and intake are you using again? Sounds like you aren't getting much out of that F-cam if it isn't making power above 5500 rpms.

[tayzoid1]

yea its just got home ported e7's and a performer 289 intake. neither of whichj like to flow above said rpm. it will turn up that high but it really falls on its head above that. and ive got my big motor on the stand getting built and not going to spend the money on another intake when i need one for my 351. my question is. with this motor im running out of gear. so theoretically im building alot more power with my big motor that translates into alot more speed. im thinkin im still going to be running out of gear with the big motor even if i can spin it a lil higher simply from the fact that im going to be gaining the speed quicker. basically same issue at a higher speed. i think i am going to try a tire change first ive never gon up a big diffrence in height as far as tires go. so i didnt know how much of a diffrence i will see

[TheJeanyus]

I wouldn't mess with it a whole lot until you get the other motor finished. Chances are the new motors is going to rev higher even though you're also going to trap higher.

I'd do this: put the money into the new motor for now, see how it acts with the new motor, then decide what tire/gear change you may need to make.

[QWKSNKE]

I wouldn't mess with it a whole lot until you get the other motor finished. Chances are the new motors is going to rev higher even though you're also going to trap higher.

I'd do this: put the money into the new motor for now, see how it acts with the new motor, then decide what tire/gear change you may need to make.

yep. that would be best

[qkjuicedpony]

how big of a 351 are you building?


If its going to be a nitrous car either way I would toss a 3.55 in it and then you will be good for either motor. Just keep 26" tires on it and you're good to go

[dropemlow]

if you end up going with 3.73 let me know i got a set of new frpp gears setting here i might sale.

[tayzoid1]

yep. that would be best
yeah imk leaning towards that. just figgured i would get some opinions on the tire change moreso than the gears iwasnt sure how much it would actually change the final ratio