Ultra Small & light weight RWD idea.

[Johnzoku]

It’s usually said that performance come at a sacrifice of fuel economy and visa versa but for a while I’ve been toying with the idea of building an Ultra Light weight RWD car to have some fun in but retain fuel economy with a decent amount of power.

The cars im deciding on are (on the idea or a 700 ~ 750Kg base car + 100Kg of driver so 850kg max.)

KP30 Publica coupe - 695kg
KP38 Publica Ute - ???
KE10 Corolla coupe - 710kg
KE20 Corolla coupe - 760kg

(I know there’s not much chance of a Publica but Ke10 and Ke20 seams accessible)

The plan is the car will be striped interior only running light weight door cards, min. dash, no sound deading, no AC (depends on how hard it will be to put in/install), min audio, race seats (very light weight old recaro’s), front carpet, if I can have it legally… lexan/ polycarbonate windows for the side windows with light weight wheels, like Techno Trv’s 13 or 14” dia and aobut 7 and 8” for front and rear.

Not planning to drift, drag it (I have 4 other Z10 Soarers for that )… this will be more of a daily and something I can take to a track day or a hill run with a good power to weight ratio… 850kg with 100rwkw?

And im aiming on a fuel economy of 12Kms/Litre (8.4 Litres/ 100Kms) or better than (so it will be cheaper to run than my Daewoo nubira)

Motor wise im a bit lost as im not sure what the normal figures of a 4k, 5k & 7k but ive read a few things from around the place of those motors making up to 150rwkw’s with turbo on avgas and 120rwkw’s on 98 ron.
I would like to build a K series motor with Gas Research carburetors in twin configuration or on a draw thru turbo or supercharges system (sc12 maybe) and ditch the petrol lines and tank completely for a Lpg only tune

So the question is, would this be attainable? 100rwkw’s with 12kms/litre fuel econ with an LPG tune or should I look at other options (4age, 1nzfe, 1z/2zzge?)

[Johnzoku]

[japlish]

if only we got kp60/61 starlets here (sigh)

[Johnzoku]

ahh! many years of contaplating importing one... its just not going to happen lolz.

[japlish]

there was a fella up here that had a ke25 as a daily, it had a 4k with a blow-through turbo setup in it, it did 115hp atw on 12psi too!
it wasn't too bad on fuel either.......

[benny]

It would also be awesome if you could retro fit some power steering into one, then you could drive it with one finger

[oldcorollas]

It’s usually said that performance come at a sacrifice of fuel economy and visa versa but for a while I’ve been toying with the idea of building an Ultra Light weight RWD car to have some fun in but retain fuel economy with a decent amount of power.

And im aiming on a fuel economy of 12Kms/Litre (8.4 Litres/ 100Kms) or better than (so it will be cheaper to run than my Daewoo nubira)

Motor wise im a bit lost as im not sure what the normal figures of a 4k, 5k & 7k but ive read a few things from around the place of those motors making up to 150rwkw’s with turbo on avgas and 120rwkw’s on 98 ron.
I would like to build a K series motor with Gas Research carburetors in twin configuration or on a draw thru turbo or supercharges system (sc12 maybe) and ditch the petrol lines and tank completely for a Lpg only tune

So the question is, would this be attainable? 100rwkw’s with 12kms/litre fuel econ with an LPG tune or should I look at other options (4age, 1nzfe, 1z/2zzge?)

to start with.. fuel economy is controlled by your right foot... total economy that is.. if you are talking cruise economy, thats different

next

The plan is the car will be striped interior only running light weight door cards, min. dash, no sound deading, no AC (depends on how hard it will be to put in/install), min audio, front carpet

umm.. never looked in a KE10 before have you?

that is ALL that is there you migth be able to save 2 or 3kg per seat, but there is nothing to pull out.

8" rims? any particular reason why?

anyway, if you want good fuel economy, you need
a) closed loop fuel, either petrol or gas
b), small overlap cams
c) probably not a K motor
c) definitely not supercharger
d) probably turbo, to make the power with the economy you want.. turbo will also restrict the exhaust during cruise to effectively reduce overlap (my theory )

also.. gas and petrol usage is different... 12km/L for gas would be pretty good

or you could buy one of the newer Kei cars from japan with CVT.. (i forget which one), they are getting aroudn 25km/L

seems this is just a picture thread tho

[Radar]

Stick on the LPG idea man... I'll be heading down that road very soon on a performance motor.
Look up "liquiphase" this should explain quite a bit more on performance LPG.
The only reason for shite fuel economy with LPG is the way its injected..
Good plan but why not try for an older sillycar or something? Strip it totally i'm sure you could lighten it even further, they already have a decent chassis a bit more work and you have a AWESOME light fun RWD (and they look farkin aweosme)

Hope this is of some help
Lewi

[WDE_BDY]

Power and fuel economy don't really go together. And the cost of making it economical is probably higher than the fuel you would save.
Having said that, mate dropped a standard 7K (only carb and extractors done) into his Starlet and seemed pretty happy with the daily driver results.

Callum

[Mooro]

Hmm I like this idea, I was tempted to do it as well, problem is old cars aren't cheap to do up. For safety reasons as well I would like to run a decent cage, with the size/weight of your average falcodore, a 30yr old 800kg car isn't going to stand up too well in a crash...but this creates difficulties with registration.

My plan was
KE25 (TE27 style) + blacktop 4age = done
or even better
KE25 (TE27 style) + blacktop Beams = even more done

Too expensive for me to do but if I ever found an unfinished project Ke25 with all the hard/expensive work done I would be tempted.

[NeoNasty]

This is a great idea.

Two words: Turbo Diesel.

In my 2 tonne Jackaroo I get 10Liters/100Kms and between 8.5 and 9 liters/100 on the highway. Its the shape of a brick too.

What about a Diesel Gemini, turbo it for some extra oomph. Hell, diesel runs on detonation, want more power? Wind in more fuel and watch those pyro temps.

[Johnzoku]

oldcorollas... the earlyest roller ive been in is a ke30 altho ive been in a few sunny's (1000, 1200 datsuns) and i guess there isnt that much in there. was hoping there could be some savings made short of making FRP pannels.

8" rims... i could say increased track but really i have some 13" rims in mind that i couldnt see fitting on a Z10 that i want to use

yeah, maybe i should of said LPG equivalent fuel econ. as i rember years ago my father explaining it to me (used to run dual fuel in the company car) Lgp is twice as cheep but youll have to fill up twice to get the same KM's out of one tank of petrol... im sure running on a single LPG tune altho would yeild better results along with better gas mixers.

(a) closed loop fuel, either petrol or gas
b), small overlap cams
c) probably not a K motor
c) definitely not supercharger
d) probably turbo, to make the power with the economy you want.. turbo will also restrict the exhaust during cruise to effectively reduce overlap (my theory )

so EFI or Gas injection, diffterent timing on in/ex?, what motor would be recomended? yeah supercharger aint really a good idea, i just thru it in there and im thinking an easy way to make power with the k motor is turbo, and i guess draw thru with gas (altho limited by no intercooler that way)

its not a picture thread... just wat im aiming for... if i wanted a Kai car i would just keep the daewoo nubira i have but it just doesnt excite me... new cars in general dont...

not a fan of 1st gen celicas im affarid to say :S

im hoping that i have enough power to move a light weight car easy enough not to need to use excessive amounts of fuel if that makes sence?

[M.J.H]

You could go for one of these.
http://www.arrowsportscars.com.au/for_sale.htm

Lightwieght and usually at the pointy end of the field.

[Pimpin_1JZ]

The ute! The ute!

That thing would be sweet.

[Johnzoku]

roll cage would be made bolt in (i have a mate that can build them for me) and something to protect the pressure vessel in the boot.

This is a great idea.

Two words: Turbo Diesel.

In my 2 tonne Jackaroo I get 10Liters/100Kms and between 8.5 and 9 liters/100 on the highway. Its the shape of a brick too.

What about a Diesel Gemini, turbo it for some extra oomph. Hell, diesel runs on detonation, want more power? Wind in more fuel and watch those pyro temps.

i get that from my poorly tuned 6Mge in my Z11 soarer... + diesel is as expensive as some higher grade unleded so there wouldnt be much benfit changin to that...

M.J.H - westfeilds arnt my thing not really something you can drive to and from work

Pimpin_1JZ - ive seen one in person but it didnt have a windscreen and the guy coulnt find one (he was in importer/wrecker as well :S)