Anybody have any suggestions on weel sizes that ( with the right diff ratieo) can get a a12 racing engine into third gear wihout losing to much guts?

dont know exactly what you're after but i've had no trouble keeping mine moving using the standard 3.7 open centre and 185/60/13's and 195/50/15's .... now with a new 4.11 lsd and 185/45/15's it's still goes just as well ....
the A12 isn't a monster for torque so it's got to be driven higher in the revs to keep the momentum up and not rely on having the motor push the car up to speed from low revs.
what have you done to your motor ?? cam, head, bottom end etc ??

I just got the cam done up into a sports cam. the manifolds have been replaces with those from a a15 and same with the head but no modification has been done on the head.They have strict modificationj rules. it hasn't been shaved down or anything and the engine hasnt been bored out or rebuilt at all.

I am in Juniour Speedway driver so wile i was still inexperienced , 2nd gear was pumping out plenty of power but now after 5 years i am doing realy higfh s[peeds but i am limited because ii cant get out of 2nd gear and it gives the poor old sunny a bit of a hard time. When i try it in third it is way too sloppy on the corners and i end up going slower.

sort your suspension out for the corners then you shouldn't have any issues with getting into third.
if you can get the car thru the corners better with the power on in second you should be able to hold the same sort of line with it in third ......

Hmmm ok . My suspension has been lowered. It just doesnt seem to have enough guts like second dose to get those fast jumpstart takoffs that i need to beat those lil #### of sharaides . I have had trouble fiding the right rayieo tyres because 13 inch are very rare now and you seem to have to get them retredded.

Two things occur to me on this:

1. what is the circumfrnace of the tires on there now.......I.E. are you using a taller porifle than say a 60 series.

2. When you say sport cam what kind of cam are we talking about spec wise. If you using something similar to a NISMO option 2 cam AND you're stuck with the stock gearbox the car will drop 3000 RPM's between 2nd and 3rd. That cam will do nothing below 5500 RPM and with what your motor is limited to it like isn't pulling past 7800-8000 range.................so when you shift to 3rd the motor falls off the cam.

If its a cam ground with mid-range in mind then chage your overall gearing so that your in 3rd all the time........your likely loosing time having to shift than you gain with the burst of power in second.

Tom

just run a 4.875 final drive.

Ok dude give me a break i am just a girl how do you expect me to know what RPMs are.?.............But i will get back to you on that one when i find out.....

Just a girl................that's no exscuse.

I can remember banging handle bars round turn 9 (100 MPH corner) at Willow Springs Raceway back in the 80's. The Gal called her team PMS racing , she was super aggressive , fun to race withand a very good rider. When I had a Showroom Stock C Miata I was racing, I once had a great dice with a Dutch gal named Eeka.........she'd race you clean or if you wanted to try and intimidate her she'd give it right back
Just a girl............thats like saying rally driver Michelle Mouton drove ok for a girl.........if your looking for more corner speed you're not just a girl , you're a RACER


Tom

Lol year girls can be pretty nasty somtimes! Iv'e bin kicking guys asses for years on the track. When you win they come up with unbelievably lame excuses. I Raced against this guy who was a year older than me and had just started racing in jnr sedans. I had been in on the track since i was like 11. i wasnt too positive that i could beat him. he was racing a big celica 2L and i was stuck in the little 1200. he was i spoilt bugga an his dad was super rich. he had the ultimate car but he didnt have the driving skills. I chalenged him and took him out easy . Ater a few meetings when he tried to control his car at my speed he put it in the wall! Practice pays off after a wile and i was glad i started out the hard way with a bomy car so i didnt have to learn it later. .....
The my cams a mid range and we got low profile tyres ( i think 14s) . We are also looking to ajust the diff ratio. I realy dont know how its going to travel until i get it out there this friday night! I will let you know how it goes! Thanks 4 all ur advice it was realy helpfull! Wish me luck

Lisa