Speedway Build Of Aexx

[Andy43]

Hi All

Need some advise please.

 

Speedway Junior Sedan racing (Kids 10 to 16 yo) is undergoing a rule change.

We are currently limited to cars that came out with 1200 cc engines. (ke30's)

 

Over the next season or so, the rules are being amended to allow 1600 cc cars.

The output of the engine will be restricted by use of a restrictor plate that will be mounted on the exhaust manifold.

Diff front or rear must be locked.

Suspension upgrades allowed will be springs and shocks noting that adjustable or competition type shocks will not be allowed.

Thats about it for performance mods

I'm told they basiclly want all cars to have simlar hp figures at the wheels so light weight could be an advantage.

 

Looking for Advise on what would be a good AE model to start building up.

Thanks

Andy

[carbonboy]

An AE82 Twin Cam, sure they're getting a bit old but if you're doing speedway & don't need road registration, you should be able to get one cheap as. I.E $1k or less.

 

Parts are commonly available & cheap as chips, I'd dare say it would perform rather well even standard.

 

Edit: how big is the restrictor plate going to be out of curiosity?

Edited December 1, 2012 by carbonboy

[MYSTIK[RL]]

as carbonboy said ae8X's would be a good start, they don't have to be twincams either remember there is 4ac variant.

 

or you could go with a early 1989 ae9x's with a 4afc, just about a bullet proof engine and if you do kill one, they easy to find in most wrecking yards

[Andy43]

Cool Thanks so far,

So they Handle OK to start with and is there any problems getting good shocks and springs ?

Not to fussed about engine HP as they will be pulled down to 3k HP figures with the plate.

The Hole sizing within the plate is yet to be advised.

Not too sure about the ECU rules yet.

[carbonboy]

They handle pretty good for in standard form for what they are. Being front wheel drive, understeer when hard on the throttle is inevitable but can be managed, liftoff oversteer is another handling trait but after practice you get used to it. :)

 

Standard replacement springs/shocks are available through most car parts stores, shop around as prices tend to vary somewhat. Adjustable coilovers are available if the rules allow.

 

Restricting a 4AGE down to 3K power levels...is that going to be good for the engine? If that's what they plan to do then I'd go for a 4AFC or even a 4AC engined car as it will be cheaper to obtain & can be upgraded.

[Andy43]

Yeah bugger about the understeer, we gota lock the diff too, as per rules.

Softer spings front, less sway bar, or stiffer at the back.

Do they power steering, as more caster could help ?

Also do they run a rear sway bar ?

Is there much difference in weight between models ?

Thanks

[carbonboy]

Oh damn, we HAVE to lock the diff... :lol: But seriously, I do not know how to do that in a fwd transaxle myself. :(

 

By the way, I don't think anyone has suggested AE71/AE85/AE86 (all rwd) due to the inflated prices (have seen a few cheap ones lately though), they would be great for it though.

 

Depending on individual vehicle-spec, not all have power steering. Quite common though, as are leaks. :P On Twin Cam models the strut tops on the front can be spun around for more castor.

 

Yes they run a rear swaybar, TC item being the bigger factory item, aftermarket larger diameter items can be found.

 

As it's speedway I'm guessing most of the interior will be stripped out & the spare tyre etc given the flick, so most of the weight variation between models comes in the form of the body shape (sedan, hatch or seca/liftback) & whether it has A/C &/or P/S. A safe ballpark would be 940-1000kg without driver.

Edited December 7, 2012 by carbonboy

[Andy43]

AE86 would be the pick but the coin is a bit too much.

We currently race againt are few FWD cars and they lock there diffs some how ?, I know everyone bitches about how heavy the steering is.

And yep everything gets stripped out, and doors, bonnent and guards get fiberglass replacments.

Cheers

Andy

[altezzaclub]

Don't weld teeth to teeth, fill a tooth with weld then go to the next spider gear and fill another tooth with weld. You get a 1/4 turn on the wheel before it locks, which is how Steve's very clever uncle did the rally Celica diff. That bit of play lets it turn in a fraction before driving both wheels. You'll need a spare for when it blows up I'm sure!

 

We've just taken the rear springs out of an AE82 hatch at the wreckers for the rally car, but I can't remember seeing a sway. I'd go 16valve with a restrictor over an 8valve with a restrictor, but maybe they will make the twinkies hole smaller.

 

The rally car has -4.5deg front camber, all the castor we can get and slight toe-out. With a locked diff it turns in well, but you will struggle with FWD. I'd suggest the same, with no front sway and soft front springs. The tail you stiffen up, and if you can get power-off oversteer it will be a bonus. The Mk1 Mini Cooper I had used to o'steer on liftoff, it was brilliant, then designers spent 20years getting rid of that. Maybe you can tweeak the negative camber our of the rear wheels with some Porta-Power chassis pump.

 

Don't let weight removal make the back very light and the front very heavy.

[Subaru_kid]

I know of a few 82's with locked diffs, 2 are welded and one has a spool afaik.

 

You have a lot to play around with on the alignments on 82s. If its an oval speedway you can run individual camber and toe on every corner until you're happy. You can add or remove camber via camber bolts and toe has adjustment built in to the rear sub frame by the use of eccentric bolts

 

I've seen a couple 82 speedway cars on my105 a while back, it might be worth finding a couple and checking them out and picking the owners brains as far as setup goes.

 

Very interesting that they're restricting exhaust and not the intake... what's the logic behind that as I'm sure that it wouldn't be healthy for any engine

Edited December 29, 2012 by Subaru_kid