Joined: 25 Apr 2007 Posts: 1092 Location: Bayswater Victoria
Posted: Sat Apr 16, 2011 4:20 pm Post subject: 12.5 1/4 mile pass is it possible
Hello Guys,
I thought I would ask the question, is it possible for a Aristo to do a 12.5 1/4 mile with standard twins and stall?
That is my goal!
I have done a 12.9 at 115mph so far!
I have not boosted the first turbo and I have just ran street tires with full interiour and spare wheel and a full tank of fuel.
Love to hear your comments.
Thanks Tim _________________
289rwkws 17psi 12.9 @ 115 mph standard twins standard stall.
Trying to be the fastest stock twin turbo aristo in OZ
Joined: 19 Oct 2007 Posts: 3855 Location: townsville,qld
Posted: Sat Apr 16, 2011 5:12 pm Post subject: Re: 12.5 1/4 mile pass is it possible
anglia wrote:
Hello Guys,
I thought I would ask the question, is it possible for a Aristo to do a 12.5 1/4 mile with standard twins and stall?
That is my goal!
I have done a 12.9 at 115mph so far!
I have not boosted the first turbo and I have just ran street tires with full interiour and spare wheel and a full tank of fuel.
Love to hear your comments.
Thanks Tim
yep,i think its possible,run a 4k stall and mt 275/40/17 et street slicks
If u raise boost on number 1 you should be able to cut ur 60fts down a lil, prob not much as your probably very close to the limits of ur tires...might b worth 0.1 in the 60ft, which is 0.2 in the deep end, some m/t semi slicks and half a tank of fuel and rip all the crap outta the car, along with the old maccas wrappers, cds, crap etc..
Increasing front tire pressure up to bout 42psi or so to reduce rolling resistance, all together, this should get u very close to your 12.5 your after, and, ptactice practice practice at the strip.... _________________
u may find that just getting down there on a 'good' day (theres a sweet spot for every track, ask some of the faster drivers out there as to when this occurs) and practicing will net you a 12.5,
i know i hit my cars limit on my first run, which is shown by my slips, but in the supra i couldnt get to the limit because the track was crappy and i couldnt get it off the line, the soarer was another pig, tranny issues stopped me from reaching its full potential..(stopped shifting under full throttle) _________________
4.083 diff
1/4 tank of fuel
headlight removed for cold air intake
slicks of some type
NOS
12-14psi 1st turbo 18psi second
Under drive pulley set? (lowers rotating mass, lower inertia, increased revs, increased power?)
Weld up int wastegate, add ext wastegate, run 3inch-3.5inch turbo back exhaust.
Wait till middle of winter _________________
"Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe."
Albert Einstein
4.083 diff
1/4 tank of fuel
headlight removed for cold air intake
slicks of some type
NOS
12-14psi 1st turbo 18psi second
Under drive pulley set? (lowers rotating mass, lower inertia, increased revs, increased power?)
Weld up int wastegate, add ext wastegate, run 3inch-3.5inch turbo back exhaust.
Wait till middle of winter
half that stuff is highly impractical, why would he change the diff if he did the runs in street trim..not to mention the cost of changing a diff.
1/4 of a tank is too low, considering he has a aftermarket fuel pump you want the entire pump to submersed all the time, keeping it cool and lowering the risk of fuel starvation under harsh accerleration.
Headlight is a good idea as is the slicks, the issue is that to get the headlights out safely, u gotta take the front bar off, making it impractical, then u cant drive it home legally with only 1 headlight.
i dont think i have to say anything bout the nos...
boosting the first turbo will only help in the 60ft as i mentioned, but time in the 60ft, equates to almost double itself down the deep end, plus he is already running 18psi on the 2nd snail.
underdrive pulley set is the same as the diff, just impractical.
wastegate idea is probably the worst idea there, due to space constraints there is almost no space to do it, plus, imagine the costs of doing it, then issues of welding on the stock cast manifold and hate to sound like a party pooper, screamer is illegal (my sunday car had one though!)
i think he wants to run his 12.5 without going to the extremes, otherwise he would of just gone 4k stall and a gt35r/t04
if winter is the time the track is at its peak, wait til then! youll know when the time is near, as all the big boys get out there and start running PBs
not sure if you were being serious when i was reading your post.... _________________
Joined: 17 May 2009 Posts: 3928 Location: S.E Melbourne
Posted: Mon Apr 18, 2011 7:56 am Post subject:
Tim you know you can achieve this.
1. We'll boost your first turbo and tweak the change over point.
2. You can safely run on 1/4-1/3 of a tank of petrol because the tank is upright in boot, not like other cars which are flat.
3. You can borrow my mickey Thompson 17's.
4. Setup your suspension to loosen the rear end and add positive camber.
5. You can borrow my 4.083 diff if needed cos I'm running out of legs at 3/4 track anyway at 118mph cos of my stall.
Practice launch with park brake and foot brake on to load up the converter and build boost on the line. I reckon we can get your 60foot times down to 1.8-1.9 with your power and this tweaks without a stall.
Joined: 14 Mar 2008 Posts: 668 Location: melbourne
Posted: Mon Apr 18, 2011 8:18 am Post subject:
Think its quite possible tim,
Strip the old lady of weight first.
(no need to have the baby seat )
seats, tools, cds,
pick a good track day and you'll be right as rain!
4.083 diff
1/4 tank of fuel
headlight removed for cold air intake
slicks of some type
NOS
12-14psi 1st turbo 18psi second
Under drive pulley set? (lowers rotating mass, lower inertia, increased revs, increased power?)
Weld up int wastegate, add ext wastegate, run 3inch-3.5inch turbo back exhaust.
Wait till middle of winter
half that stuff is highly impractical, why would he change the diff if he did the runs in street trim..not to mention the cost of changing a diff.
1/4 of a tank is too low, considering he has a aftermarket fuel pump you want the entire pump to submersed all the time, keeping it cool and lowering the risk of fuel starvation under harsh accerleration.
Headlight is a good idea as is the slicks, the issue is that to get the headlights out safely, u gotta take the front bar off, making it impractical, then u cant drive it home legally with only 1 headlight.
i dont think i have to say anything bout the nos...
boosting the first turbo will only help in the 60ft as i mentioned, but time in the 60ft, equates to almost double itself down the deep end, plus he is already running 18psi on the 2nd snail.
underdrive pulley set is the same as the diff, just impractical.
wastegate idea is probably the worst idea there, due to space constraints there is almost no space to do it, plus, imagine the costs of doing it, then issues of welding on the stock cast manifold and hate to sound like a party pooper, screamer is illegal (my sunday car had one though!)
i think he wants to run his 12.5 without going to the extremes, otherwise he would of just gone 4k stall and a gt35r/t04
if winter is the time the track is at its peak, wait til then! youll know when the time is near, as all the big boys get out there and start running PBs
not sure if you were being serious when i was reading your post....
someone deleted it but... your a dumb Fk
What is with the 'impractical'??? Re read his thread. Asked how to get 12.5's on stock stall and turbos. Did not mention budget or anything
The cost of changing the diff is fk all, sell old lsd, buy new diff? have no idea what you're talking about running in street trim. Quite a few boys running the shorter ratio diffs on these forums. Almost free if can sell old LSD diff for similar price. Should improve 60ft by atleast 0.1 -0.2 which like you said, doubles down the end of the track.. so could possible shave 0.4 off hi 1/4.
running 1/4 of a tank.. I do it all the time, have 044. take a 20l jerry can with him. Done deal. Cheaper then running full tank 1/4 a tank ie 20litres of fuel, save 50kg of weight from a full tank.
Headlight removal is free power..takes a tiny bit of effort to remove..can all be done at track pits.
Nos is the easiest best mod there is. some think it's cheating..yeah right. Connect bottle at track, totally legal. Will easily put him into the time he wants. 2j's are strong enough to cope with the hit of nos to. could install for probably $1k.
Underdrive pulley is an unorthodox approach, but is cheap, and has proven results. probably $250.
Only fkd thing about the wastegate idea is taking the turbos off.. This has been done on a supra before and the guy could run a big open exhaust with no spiking issues at all. Will result in alot more horsepower and possible increase in spool times, plus will take some exhaust back pressure of the turbos.. The job of welding a wastegate on is not hard if you have some skills.
He is a fabricator, so I believe, so cost would be stuff all..plus cost of wastegate, then big dump pipe etc.
But better yet, take all the maccas wrappers out of his car, raise the fron tyre pressure from 38psi to 42psi and he should see results righteo or maybe YOU were joking..
Mods don't delete my post again.. _________________
"Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe."
Albert Einstein
Druss, i know theres no mention of budget, but considering he went to the effort to keep the stock twin and stock stall, i assumed he didnt want to go spend a grand or 2 to get the 12.5
Changing the diff takes wat...3hours? pull up along side a commodore at the lights, normal conversation goes down, wat does it run, 12.5 if i chuck my other diff in...
doesnt exactly work does it...plus it will chuck out the speedo, which i assume he doesnt want..
wats a NOS kit cost these days? cheapest i just found is 720 buxs...not exactly cheap..
headlight takes a bit of effort, has potential to be worth it, if u wish to go to the effort,
maccas wrappers is meant to signify dead weight, cds, rubbish, baby seat, car mats, old pens anything that isnt needed, is dead weight, weight is a killer every knows that, i didnt actually mean old maccas wrappers, unless u actually have them in the car,
reducing rolling resistance by increasing tyre pressure is pretty self explanatory, i know ur being a smart ass by saying 'take the wrappers out and pump up the tyres and enjoy the 12.5'....thats a bit of a reductio ad absurdum, although it could realistically be the difference between a 12.5 and 12.6
i tried to keep budget in mind with my ideas, as i wasnt given a budget initially...there are many ways to go faster on the cheap, even more so when u have a full toolkit/spare tyre and baby seat in the back! dead weight!
Joined: 25 Apr 2007 Posts: 1092 Location: Bayswater Victoria
Posted: Mon Apr 18, 2011 5:19 pm Post subject:
Hey guys love your comments, keep them comming
To make things a little simpler I want it to be a real 12.5 street car so full trim, But saying that I will pull the spare wheel jack etc out of the car.
Change diif I may consider.
Budget yes there is. really not a whole I can do to the car while I am still running standard twins I think I am on the limit of them with the power its making.
Boost first turbo I will do change rear tyres and tyre pressure also.
I was thinking of doing a water spray or some how use dry ice to cool inlet temps just throwing that idea out there.
Every one has there own ideas and thoughts so can we please keep this thread clear of abuse and its free to be nice _________________
289rwkws 17psi 12.9 @ 115 mph standard twins standard stall.
Trying to be the fastest stock twin turbo aristo in OZ
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righteo or maybe YOU were joking..
