Javascript Disabled Detected

You currently have javascript disabled. Several functions may not work. Please re-enable javascript to access full functionality.

some help with diff ratio selection?

Started by _pinklx_ , Oct 04 2012 08:21 PM

Please log in to reply

22 replies to this topic

#1 _pinklx_

Guests

Posted 04 October 2012 - 08:21 PM

been in the middle of a long term project building a new driveline. things are looking closer now. engine should make about 650 at the fly between 8 and 8200. have full manual t400 5000rpm converter, 26x12 sr raidials on atm but intention is to run slicks of same dimentions. been doin a little maths and it seems like 4.3 may be the right ratio for this setup? all in lx sedan, full street trim. will be looking at a change of susspention for the 1/4 have full adjustable upper n lower trailing arms from pmt and koni adjustables all round atm. kings heavy springs as well. i do realize for seriouse raceing alot will need to be changed in this area but this car is street registerd and driven, occasionaly. there is plans to run gas on this as well later down the track, probs a fogger direct port starting with 150shot. any help would be great thanks.

Back to top

#2 dattoman

Do I feel lucky? Well, do ya, punk?

Administrators
16,470 posts

Name:Neil
Location:Perth Western Australia
Car:LX SS , 76 Cadillac , 3 x dattos
Joined: 04-February 07

Posted 04 October 2012 - 11:17 PM

Start with 4.11
Once you get the car running and sorted you can play with ratios
You want to be crossing the line in top gear at max rpm or there abouts for fastest ET's

Back to top

#3 TerrA LX

Fulcrum Fixture

Members
14,241 posts

Location:Sid 'n' knee
Joined: 31-May 06

Posted 05 October 2012 - 09:09 AM

WOW 800hp on the gas, this thing will be doing door slammer times.

Back to top

#4 _pinklx_

Guests

Posted 05 October 2012 - 10:02 AM

i dont know about doing door slammer times but if it dose a 9.9 ive done what i wanted, anything lower is a bonus, yes my orginal thought was 4.11, when the cam guy said max power at 8 to 8200 i starting thinking lower as the rev range is higher than first planed. ive orderd my new axles a few weeks ago and was thinking about getting a centre off the same place, altra 9 in bissy, nice guy. so im hoping to get it right the first time. 2400 for a centre dont want to have to buy 2 or 3 or.....

Back to top

#5 hanra

Oh My, Don't you post alot

Members
10,831 posts

Name:Brad
Location:Farrrrrr North Qld
Car:1975 LH SL/R 5000, 1967 Morris Cooper S, E36 BMW, Toyota Corolla, Isuzu DMax
Joined: 24-March 11

Posted 05 October 2012 - 10:41 AM

My mate just got a centre built by Altra9. $3100.

Back to top

#6 _pinklx_

Guests

Posted 05 October 2012 - 07:23 PM

holy shit, when i was there getting my axles done he quoted me for a brand new strange big bearing case, big pinion support, wave trac hemisphear, gears of my choice(ratio) 1350 billet yoke, all for 2400, not alloy tho. is your mates alloy? might be where the extra cash went?

Back to top

#7 _xtgt_

Guests

Posted 07 October 2012 - 07:00 AM

What cubic inch & weight?

Back to top

#8 _pinklx_

Guests

Posted 07 October 2012 - 10:43 PM

355 lx torana, seadn, i think they are 2600lbs. mine would have a bit on that due to 9" t400, havent had it accross a weigh bridge as obviousely its not finished yet.

Back to top

#9 hanra

Oh My, Don't you post alot

Members
10,831 posts

Name:Brad
Location:Farrrrrr North Qld
Car:1975 LH SL/R 5000, 1967 Morris Cooper S, E36 BMW, Toyota Corolla, Isuzu DMax
Joined: 24-March 11

Posted 08 October 2012 - 10:08 AM

holy shit, when i was there getting my axles done he quoted me for a brand new strange big bearing case, big pinion support, wave trac hemisphear, gears of my choice(ratio) 1350 billet yoke, all for 2400, not alloy tho. is your mates alloy? might be where the extra cash went?

Yeah its an alloy case.

Back to top

#10 _xtgt_

Guests

Posted 08 October 2012 - 04:42 PM

4.11's should be ok. What induction package are you running to make power at 8200rpm?

Back to top

#11 _pinklx_

Guests

Posted 09 October 2012 - 11:24 AM

2x1000cfm 4b throttle bodys, 65lb injectors, bain raceing tunnel ram, camtech soild roller 274/[email protected]. obviousely the engine is still all sitting here in boxs atm and im just going on theory. when the engine is assembled and on a dyno things may not work as expected. nuthing ever dose.

Back to top

#12 _fatlh5000_

Guests

Posted 09 October 2012 - 11:45 AM

I have a 4.11 mini spool centre in my car at the moment, which I am looking to change (to 3.5 true track LSD).

PM me if you are after a centre.

Back to top

#13 _pinklx_

Guests

Posted 10 October 2012 - 09:38 AM

thanks for the offer bro but im realy not interested in any type of spool. too much of a pain in a rego'd car. most likely why your going to tru trac?

Back to top

#14 warrenm

Forum Fixture

Members
2,106 posts

Location:Central West NSW
Car:1972 LJ Torana
Joined: 08-November 05

View Garage

Posted 10 October 2012 - 09:52 AM

You could remove the gears & sell off the spooled hemisphere.

Back to top

#15 _fatlh5000_

Guests

Posted 10 October 2012 - 11:23 AM

thanks for the offer bro but im realy not interested in any type of spool. too much of a pain in a rego'd car. most likely why your going to tru trac?

Thats why Im going tru trak- a bit more street friendly

Back to top

#16 _fatlh5000_

Guests

Posted 10 October 2012 - 11:49 AM

engine should make about 650 at the fly between 8 and 8200. have full manual t400 5000rpm converter, 26x12 sr raidials on atm but intention is to run slicks of same dimentions

You'll be having some fun on the street with 650 @ 8200 !!!!!!

I

Back to top

#17 _pinklx_

Guests

Posted 10 October 2012 - 09:25 PM

yeah i know, the car is bearly driven these days, country cops n my car seem to have an allergic reaction to each other. i figure if i cant drive it bugger all i'll make it near undriveable. i do plan on keeping the rego tho and it will see the very occational street driveing, just i had a spool in a 600hp hq 1 tonner, was a total pain in the ass. it seems from what ive read that the wave trac is the best comprimize. i actualy have a 31 spline full spool hemisphere here in a carrier that was the original plan, im just going to sell it tho. what sort of coin u want for the 4.1? i have a vl here with 20's and a t56, might go allright in that with say a tru trac in it.

Back to top

#18 _Bomber Watson_

Guests

Posted 10 October 2012 - 09:42 PM

According to the moroso slide rule 135mph on 26" tall tyres at 8000rpm = 4.6:1

I used 135mph cause thats wht it says for a 9.90

That said, 650 in a 2600lb car should do 9.2 @ 148, so same tyres same rpm but that means you want around 4.1.....

Just get the 4.11's lol.

Cheers.

Back to top

#19 _pinklx_

Guests

Posted 10 October 2012 - 11:08 PM

yeah i did the same math, says 9.17@148mph with 4.3 and 26"

Back to top

#20 warrenm

Forum Fixture

Members
2,106 posts

Location:Central West NSW
Car:1972 LJ Torana
Joined: 08-November 05

View Garage

Posted 11 October 2012 - 08:17 AM

Remember that the "slide rule" HP is at the tyres not the flywheel, so 650 becomes 520-550, depends which converter you use.

Back to top

#21 TerrA LX

Fulcrum Fixture

Members
14,241 posts

Location:Sid 'n' knee
Joined: 31-May 06

Posted 11 October 2012 - 09:47 AM

^ the gas will make up for it.

Back to top

#22 _pinklx_

Guests

Posted 11 October 2012 - 11:50 AM

if i could get a 9.9 without the gas i would be happy, big ask but im going to have a crack at it. even a 9.99 and ive got what i wanted, still a 9 right?