BPU (Basic Performance Upgrade)

[tDR]

Originally Posted by Suprafly

Right I'm currently ordering parts from whifbitz for a full BPU.

I've got a 96 J-spec RZ-S, I already have a Blitz Nur spec cat back system fitted, so I'm after:

HKS FCD

Question is what grade plugs do I go for?

Grade 7's. Check out the spark plug FAQ for well documented info on the subject.

I'd always go with a GReddy BCC (another name for an FCD) over the HKS FCD because of the method it uses to fool the stock ECU on the airflow signal.

Cheers,

Brian.

[deathmonkey]

Massive apologies if this has been answered either on this thread or elsewhere, I've searched solid, I promise !

Anyway, as I'm hoping to go BPU by the summer, I was just wondering what type of fuel I should be aiming to use? Does it not change from what I've always done - use the best at whatever station I'm at, or should I really be looking to use v-power for example, when I do eventually go BPU.

Thanks guys, again apologies if already answered.

[Homer]

Simply use the higest octane fuel available to you. Shell v-power, BP Ultimate, etc. As always, ensure you have an AFR (worry gauge) to keep an eye on the levels and if it gets beyond limits back off.

I wouldn't recommend it though if only low octane is avaiable, unless the car has an aftermarket ECU & map at higher boost pressures (1.1 and above) it's *needed* to use high octane fuel. Peak power is not the issue, it's the switch-over point that causes det.

[deathmonkey]

Originally Posted by Homer

Simply use the higest octane fuel available to you. Shell v-power, BP Ultimate, etc. As always, ensure you have an AFR (worry gauge) to keep an eye on the levels and if it gets beyond limits back off.

I wouldn't recommend it though if only low octane is avaiable, unless the car has an aftermarket ECU & map at higher boost pressures (1.1 and above) it's *needed* to use high octane fuel. Peak power is not the issue, it's the switch-over point that causes det.

Thanks for the reply Homer, good to know .

[BABZ988]

i think:
if i buy a tanabe full decat system (usually a 4"); i'll need a restrictor ring !
but if i buy a 2.5 decat system from whifbitz ; will still need a ring?
looking for BPU at the moment!

[Homer]

If it'a a jspec then yes, you will need the restrictor ring and the other mods before decatting, regardless of the exhuast diameter.

[Pudsey]

Can someone answer me this, as there seems to be some differences of opinion.

I am BPU'ing my 1998 VTT-i Twin Turbo.

I need to know if I need a Fuel Cut Defender or not.

If I don't fit it and run the car without it will it get damaged?

Any advice would be appreciated and is rather urgent due to attending Japfest tomorrow.

[Thorin]

You need one, otherwise you'll hit fuel cut >1.0bar

[Shane]

Just about to go BPU and I have a couple of questions both relating to the ristrictor ring.

With the restrictor ring in with a hole of say 2 inches, is there any real point or advantage with a 3" exhaust, surely the ring becomes the most restrictive point and any advantage of a big bore exhaust after the ring is lost?

If I use 3" decat pipes and then have the ring between the second decat and the exhaust, surely when the engine is suddenley revved hard, until the pressure is built up between the turbos and the restrictor ring it is possible to overboost?

I know this is all proven territory and don't question it works as of course it does but as I was looking at the 3" decat pipes I bought for mine these questions just sprang to mind.

[supra-ireland]

I've a question about my BPU setup.
I've got an Apexi S-AFC, it came with the car uninstalled.
I'm happy to install it myself but having read through the foum some people suggest that there's no point fitting one with a BPU setup.
Can the S-AFC improve things or should I just forget about it?

I've got stock turbos and was hoping to usually limit boost to 1.0 bar and occasionally go up to 1.2 bar.

[tDR]

Sell it and do things properly if you want to get into tweaking maps IMO.

[supra-ireland]

Originally Posted by tDR

Sell it and do things properly if you want to get into tweaking maps IMO.

Ok, thanks.
So at a BPU level is there much point with aftermarket ECUs and the like
or are you as well to stay with stock?

[tDR]

I'd say there's definitely gains to be had but the ECU or piggyback needs to have decent resolution mapping wise to really get the most out of the sequential setup to optimise the fuelling and timing across the rev range.

[supra-ireland]

Originally Posted by tDR

I'd say there's definitely gains to be had but the ECU or piggyback needs to have decent resolution mapping wise to really get the most out of the sequential setup to optimise the fuelling and timing across the rev range.

Is there anything you could recommend?
I want to keep costs down but at the same time I'm willing to spend enough to get something proper.
Thanks for the advice.

[Peter P]

Originally Posted by supra-ireland

Is there anything you could recommend?
I want to keep costs down but at the same time I'm willing to spend enough to get something proper.
Thanks for the advice.

Would recommend looking at one of the SYVEC ECU's that Ryan does as these seem very comprehensive and would be future proofed if you went single at a later date.

The Whifbitz Time Attack cars both run this ECU to good effect and it also has goodies such as traction control and boost control involved.

Have a look under 2 bar tuning as a trader and see what you think.

There are other options but Ryan sets these up perfectly and the piece of mind having UK support both with the manufacturer and tuner appeals to me.

Will be what I go for when I get my next one!

Just my opinion by the way.

Pete