[LJZ]

This is true, I have only just started to scrape the surface with my mods, it will be a while before I am even at BPU

Regarding the stock twins, does this mean even if I get aftermarket ECU, fuel pump, injectors, BCC, Boost controller and high flow cats I still won’t see upwards of 300kw?
Are single turbo conversions even legal, can you get an engineer certificate for them? For some reason I have a feeling that it needs to stay twin? Could be completely wrong

[IcE]

AFAIK its all an emissions thing.


You can go single and get it signed off by an engineer/EPA as long as it still meets emissions requirements.

But just whacking a BFO Single on the side of your 2j and getting rid of half of the plumbing is going to land you a defect sooner or later :)

[ma61turbo]

LJZ, on 09 March 2011 - 01:06 PM, said:

This is true, I have only just started to scrape the surface with my mods, it will be a while before I am even at BPU

Regarding the stock twins, does this mean even if I get aftermarket ECU, fuel pump, injectors, BCC, Boost controller and high flow cats I still won’t see upwards of 300kw?

Pretty much. And the first three will make SFA difference in what the stock twins will make.

Quote

Are single turbo conversions even legal, can you get an engineer certificate for them? For some reason I have a feeling that it needs to stay twin? Could be completely wrong

Can be engineered easily enough, but it'll cost ya. Most people don't tend to bother and then complain when they get defected(funnily enough).

[Darren]

Correct IcE that is why I went with Hi Flows to remain stealthy. Im making 320rwkw which is plenty for road use. I have done that with various mods. ultra_supra made 270rwkw with exhaust and intercooler mods only. We still reckon he had a freak motor but this sort of thing is possible if the motor is nice and tight still. Im sure he would suggest that is plenty for everyday use. We even swapped out ECU's at a dyno day with a known stock one and all he ended up doing if I remember right is making a couple MORE rwkw.. BPU is definately the way to go at this stage mate and you shouldnt get any extra grief from Mr. Plod. It has been suggest a few times that you can get a Single engineered and signed off as legal but I am yet to see proof of this anywhere in Australia yet alone here in SA.

I have a mate with an R33 GTR that now runs bigger twin setup and aftermarket ECU. Cost him thousands sending it over to NSW which had/has one of the few places certified in Australia for this sort of work. His car now legally complies with Australian emmission standards and has paperwork to prove it. He has plenty of $$$$ and went through the motions to stick it up Regency on principle as they gave him a shocking run a round over a 2 year period. He got pulled over and defected for Blue/Purple headlight globes ( which he didnt have they were standard factory) so had to do the Regency run. The guy he got the car of set it up for track work so engine was moded, ECU,bigger twins, 12" rubber all round and about 20 other mods. He actually got everything engineered and approved except for the rubber so he now runs 10" all round. Funniest thing is he has a cop mate in traffic and he told him that his car is flagged on the in car computers telling them not to defect it as all mods approved, what a laugh. Good win for him I guess :friends: He paid $50 000 for the R33 and spent nearly $60 000 on top getting everything done and engineered. The ECU has been tuned and sealed in a metal case with a tamperproof seal to stop any fiddles and this is bolted to the firewall with further seals. He doesnt care about further mods as it makes 430 kw at all 4 wheels and handles on rails. Im just not sure its worth nearly $110 000.

Next time I catch up and we have some time I will walk you through all the changes I have made and which ones I would do different in hindsight. If doing a fuel pump upgrade definately go a Denso over the Bosch as the Bosch one is a noisy piece of work :lol: Mind you my twin plate clutch covers most noises within 50m of the car :(

[ultra_supra]

since Darren mentioned me, I guess that i should chime in at this point :)

ma61turbo, on 09 March 2011 - 08:33 AM, said:

IMO waste of money. You'll never be able to push the stock twins hard enough to have issues running lean with the stock fuel pump. Only useful guages are wideband anyway and these are pretty expensive still I think.

Just go the standard BPU route. Tried and tested by many, many people. It's only when you feel like squeezing out the last bit of useable power out of the stock twins that you'l have to start looking at doing something creative. You will need a BCC if you want to run much more than stock boost(my vvti still doesn't have one and no evidence of any cutout so far at 1bar). Forget fuel pump, stock one is fine for the max power the stock twins will put out.

I agree with everything that ma61turbo said re stock twins.

you don't need an in car AFR gauge as the stock ECU and fuel system is good for up to 300rwkw - you won't lean out. I never did and have done plenty of dyno runs to show this.

ma61turbo, on 09 March 2011 - 08:36 AM, said:

ignore the guys over on the national forums that believe 300rwkw is posible with stock turbos, it ain't going to happen(regardless of what x dyno run tells you).

correct. you won't get to 300rwkw on stock twins. I think that I've adequately demonstrated the limit of the stock turbos here in SA. you can refer to my sig for the end result. i could have run more than 21psi with a boost controller, but probably wouldn't have gone further than 290rwkw. the engine bay heat generated by the turbos is a major penalty and turbos won't last long at that boost. again, I think that I have proven that with a heavy and expensive paperweight as the result.

LJZ, on 09 March 2011 - 06:51 AM, said:

For my supra I want to keep it on the street, this is the main thing. I never want to make it so that I am always avoiding the 5.0 and only taking it out on midnight runs.

and this is true - once you enter that territory, it isn't enjoyable dodging the po-po all the time. the grass isn't always greener on the power side of the fence!

[JTMILLER]

Kim time to update your signature,

2010 - stock twins are dead so no more boost for me :(
2011 - SA Supra annual dyno day = 785rwkw (boooooooost)

[LJZ]

Wow darren that sounds like he went to great effor and money to get that thing road legal.
I was pretty sure that single conversions were defect hungry and this has just confirmed my thoughts.

Darren, on 09 March 2011 - 03:35 PM, said:

Next time I catch up and we have some time I will walk you through all the changes I have made and which ones I would do different in hindsight. If doing a fuel pump upgrade definately go a Denso over the Bosch as the Bosch one is a noisy piece of work :lol: Mind you my twin plate clutch covers most noises within 50m of the car :(

Yes next time we catch up that would be awesome. There is alot I can learn just talking to someone about this. It seems that the more I research the whole BPU thing the more confusing it becomes.
New fuel pump - what brand, in tank or out of tank, how many litres, how many volts?? My mind is going CRAZY!!!
And these sort of questions keep poping up as soon as I get onto a new chapter in the build.
Keeps me on my toes I guess :dance:

You coming to the cruise this weekend darren?

[Darren]

Not sure at this stage as I now have to work Saturday and really should have some family time. I will have to play this one by ear at the moment.

[LJZ]

Just saw your imput ultra_supra, cheers for the imput. Its good that there is no contradictory info by all the sasupra guys, makes my decession making alot easier
This is all starting to make alot of sence. I will leave it there for now and maybe create a BPU thread for people to follow my progress.
My first chapter will be my custom downpipe/midpipe highflow cat.
Thanks heaps everyone for very very good info

[ma61turbo]

ultra_supra, on 09 March 2011 - 04:53 PM, said:

heavy and expensive paperweight as the result.

Speaking of paperweights, when can I get that core off you?

LJZ: I may head out to the meet point for the cruise on the weekend if you want to have a chat. If I do, watch out for the dirty-arse black S2 ;)

[LJZ]

ma61turbo, on 10 March 2011 - 07:56 AM, said:

LJZ: I may head out to the meet point for the cruise on the weekend if you want to have a chat. If I do, watch out for the dirty-arse black S2 ;)

I am only going to join the group at the lunch break in birdwood or where ever the group decide to stop as I live up this way. If you decide to come along to the lunch spot I will keep an eye out for your dirty beast