1uzfe ra28 weight balance

[TurboRA28]

Hi all, i've done some searching and found a few bits n pieces but not enough to satisfy..

I continue to come back to the idea of 1uz'ing the RA28.. Don't need to get into why but its the direction I would like to go in.

Now my only concern is weight balance.. I can't seem to find a definitive weight of the 1uzfe engine and to compare to the current 3sgte engine.

I don't want to upset the car too much as it's predominately used for track days and dont want it to be an understeering pig.

A lot of people seem to say it'll upset the car, but i'm not really seeing why? It's the same length as a 3sgte, so not hanging anymore over the front wheels.. It also from the estimates i've seen is within 20 - 30kg of the 3sgte? So I don't see why it would upset it too much?

Any info regarding the weight and balance of a 1uz in a ra28 would be much appreciated.

Cheers
Joel

[big_zop]

While i have not been able to confirm these myself and you have probably come across these figures, in my research i have found these weights:

Complete 2UZ (w/ iron block/oil/coolant/auto flex plate)...245
Complete non VVTi 1UZ (w/ auto flex plate)...................190
Complete VVTi 1UZ............................................... ......220
Complete 1G-FE (from MOS including pic on scale).......176.65
2JZ-GTE............................................... .....................269

And food for thought
LS-1 (w/ ALL accessories, stock exh manifolds)...........208.65 and it will bolt straight up to a Tremec

My questions to follow that would be:
- how much does a RA28 weigh?
- what have you found a 3S-GTE to weigh?
- what sort of trans do you want run? (got weights for some of those too)
- do you want this to be legal? and if yes
- do you eventually want to add forced induction?

[TurboRA28]

Yeah those were the kinda weights I was seeing.. I would be going for a non vvti so in the 190kg mark.. Some accessories would be removed such as PS, hydro fan, etc.. So maybe could save a bit more.

RA28 comes in at 1120kg on my current engineers report.

3s-gte i believe to be around 170kg - 180kg. Maybe little less as i have less accessories.

I would run a W57 box

Legal, yes. Would keep NA.. Maybe one day see what can be done to add a turbo but would see if I could crack 190rwkw with a NA 1uz i'd keep it that.

Cheers

[Toy77]

so joel are you banking on the ncop coming into practice in nsw?

Last time i spoke to my engineer, he reckoned that nsw may not take it on at all - and if they were had not made any indication...

have you heard different?

Cheers
Stew

[big_zop]

What impact is NCOP going to have on the current rules, as a 1UZ (or 3UZ for that matter) would be legal to be forced in your car?

Without having any experience in this in particular, i believe that balance may be a matter of perception. Your 3S already looks like its far back in the bay and at least putting a 1UZ is going to keep it quite similar and not going to put the weight further forward than a straight 6. You would at least save the intercooler and pipework while being NA and with that being much further forward will have a bigger impact to saving 10-20kg in essentially the same area.

Even if the difference does make a noticable effect on your setup, you at least have the ability to change the setup/tune the suspension to suit as its not like you are putting a 2JZ in there.

[Glenno52]

This sort of looks nice...eh?

[Lambolica]

The RA28 is a pretty nose heavy bugger to begin with.

I have been looking at trying to achieve a 50/50 front rear for my next planned project and alot of weight needs to come out of the front and either disappear or be relocated to the rear.

My research
W58 = 40kg (90lb) No crossmember
W50 = 50kg (110lb) With Crossmember
18R-C = 140kg
18R-G = 140kg
1G-FE = 176kg
1G-GTE = 175kg
1UZ-FE = 165-170kg running minimal acc. just the minimum needed.
Beams 3S-GE = 145kg No exhaust mani but with flywheel/clutch
3SGTE ????? But would be guessing in the 150 area.


Stock 18R-G powered RA28 Weighs 1085 (615 front) (470 Rear)
1G-GTE Auto powered RA28 Weighs 1200 (620 front) (580 Rear) Configuation unclear

I keep comming back to the Beams for my plans

Cheers
Simon

[Toy77]

nah...

ncop doesnt make forced legal..... itsmake NA legal.

The current multiplier is 3.5 times the vehicles mass.... so 1uz not legal.

cheers

[big_zop]

Originally, i forgot that all my research involved much heavier cars but re-reading the rules says that those factors only apply if it is under 1100kg AND the largest engine available is 4 cylinders.

When the tare mass is over 1100kg AND/OR with engines having more than 4 cylinders and in this case, mono constructed (chassis is not a separate structure) - the muliplication factor is 4.82 for NA and 4 for FI, giving a capacity allowance of 5398 NA and 4480 FI.

[jeffro ra28]

Yes, but the original tare weight of an ra28 is 1070kg therefore putting it in the under 1100kg category.

So according to VSI06 the multiplier is 3.0 for NA and 2.5 for FI.
http://163.189.7.150/registration/do...s_nov_2007.pdf

Therefore maximum FI engine capacity for RA28 is 3.21L

[big_zop]

Oh, i see.

Well, i guess it could depend on the engineer and if its registered/engineered at 1120kg then maybe the engineer will go off that - but its probably best to talk to them about the legalities first.

[MWP]

I don't want to upset the car too much as it's predominately used for track days and dont want it to be an understeering pig.

Cut into the firewall, move the engine back as far as you can.
Itll make a decent difference.

Ive removed the PS pump, AC pump, fan pump, traction control and a few other parts off my 1UZ.
Im not sure what the total weight is now, but i wouldnt be surprised if is 10kg lighter without those parts.

[Toy77]

nah mate - no engineer will use the vehicles current registered weight, it is clearly laid out in the regulations.

Other wise it would be easy - roll cage and fuel - then 2j would be legal. if the NCOP is adopted, then those weights change - and these motors will be legit, but as i said, my engineer is pretty involved with the situation and reckons there is nothin to indicate they are going to follow it yet - which is bloody stupid! National code, except these states that dont want it.....

Cheers
Stew

[TurboRA28]

Dang.. I was sure a NA 1uz was allowed.
That is going to screw my plans.

[Toy77]

Yeah its crap.....

im allowed to have a 300+ rwkw iron block in th front of mine.... but a 200rwkw alloy block is more dangerous.....

i wanted this set up years ago - but the only v8 i could really go with was the rover 3.5l.

If the NCOP comes into effect, then this will be ok (as far as i can remember - havent read any of the rules for ages now) so dont shelve the idea totally.... just goives you more planning time....

An OCTO throttle 1uz would be fat as in a sexy blue 28....

cheers
Stew