Right, just to cut a long story short. Iv been looking to sell my car and buy a 350z, then thought why not just use the extra cash to upgrade my car a lil more instead

so this is where i stand. I have all bolt on mods now running around 350bhp @ 1.25 bar boost. So what i want to know now is what sort of engine internal upgrades will i need and how much will it cost. So far i have come up with forged pistons and a new turbo i think because i have gt28rs.86 housing is that correct?

i am planning to upgrade my suspention as well as theres a nasty nocking sound when going over big bumps so if someone could let me know the best handling gear.

cheers for any help!

Headwork improves power and spoolup, you'll have to check the torqueitalia website for prices, I can't remember. There is a thread on this somewhere.

Tubular manifold - better spoolup and I think power. Expensive though, around 1 grand.

External wastegate - better spoolup and power, no idea on the cost.

Thats some things off the top of my head.

To do it properly you need
- head that can flow 400BHP
- ported exhaust manifold
- Forged pistons
- Forged rods
- Helix clutch
- Walbro GS341 or GS342 with voltage mod
- Live map or whatever
- 380cc/min injectors or better
- full 3" turbo-back straight through exhaust without cat would be advisable
- Decent boost controller I suppose

But then you don't really want to run std brembos for 400BHP either so think about brake upgrades to - 330mm disc/caliper conversion ideally

Think carefully about it as you wont add much value to your 7-11 year old car for doing all this...

John

ye i know but looking on autotrader and things like that the cars no worth selling either. cheers for the help lad that realy helps especialy when johns coupe is running 616 bhp! damn top stuff!

Are you still on standard suspension Nick as I know you like your track days?

a lot will depend on which turbo you choose ,and will effect how the car drives/responds too.

Sorry forgot cone filter, SIP and decent FMIC.

and deep pockets

And a swear box!

And a understanding partner... better still stay single

Or be very good at hiding things in the garage, and not getting things posted to your house etc etc

and double your budget and expect things to take twice as long

+1

having said that, you do have a feeling of emptiness once all is done (not there yet, but say 90% done atm...)
Is it serious, should I start therapy I wonder

V.

as soon as it`s done you think.......................why didn`t I do that tooo,and you start all over again....ask John

get used to visting your local ECU mapping place,..VERY often!

Joe

When you're doing pioneering or challenging stuff often the journey is better than the outcome. For me the interest was always in the engineering and using the engineering to push the boundaries of the car and my knowledge. I would quite happily start again on a different project if someone offered me decent money for my car.

How much would you roughly budget for 350hp to 450hp Engine?

- Turbo (Off set against selling 28R £900)
- head that can flow 400BHP (£1k)
- ported exhaust manifold (Tubular £1k)
- External wastegate (£400?)
- Forged pistons
- Forged rods (£3k Fitted)
- C&B cams (£600)
- Helix clutch (Would a Walkers 6 survive?)
- Walbro GS341 or GS342 with voltage mod (£100 Balance against selling 255)
- Live map or whatever (£1-2k)
- 380cc/min injectors or better (£?)
- Swirl Pot (£250?)
- full 3" turbo-back straight through exhaust without cat would be advisable (Got that but £750?)
- Decent boost controller I suppose (Got that too but again £300)

I DON'T want to add that up

Would Evo front mount survive?

If you're spending that much why not add another grand and get MOTEC with traction control and all the other bits.

erm - because it's a lot more than a grand?!?!?!?!?

Aye - but he's already budgeted £2k.

Which is what it will cost without installation and mapping...

If i was going to 450hp then I think I would Motec! I'd imagine it would be worth it! Coz the power would be totally usable!

Who does it?

Are my Estimates correct??

Motec for a Coupe has only been done by Owen Developments in the UK. Cost is thick end of £2k for the ECU plus a lot for mapping and some more for traction contol. Not a cheap option by any means.

As for prices -
- Turbo (Off set against selling 28R) - £500
- head that can flow 400BHP (£1k)
- ported exhaust manifold (Tubular £600)
- External wastegate (£400 inc piping
- Forged pistons
- Forged rods (£3k Fitted)
- C&B cams (£650)
- Helix clutch (Would a Walkers 6 survive?) Probably not because they use recon cover plates
- Walbro GS341 or GS342 with voltage mod (£100 Balance against selling 255) if you already have a 255lph you may be ok, it's only the GS340 and the low pressure version that cannot flow it.
- Live map or whatever (£1-2k) £750 I guess
- 380cc/min injectors or better (£?) £250
- Swirl Pot (£250?) £500+ with all the piping - but you will also then need an external pump which adds another £100 - if you do this you DO NOT need to uprate your in-tank pump as it flows without pressure so can flow enough.
- full 3" turbo-back straight through exhaust without cat would be advisable (Got that but £750?)
- Decent boost controller I suppose (Got that too but again £300) Probably would want an AVCR

Evo 6 intercooler is just about up to it.

I think you have three options for an external ECU:

Motec M400 / M800
Pectel SQ6
OMEX OM17

For motec you'll be going to Owen Developments.

Talking £9k... So Far :eek:

Maybe I'll get a loan 4 £10K

Who makes Tubular manifolds? is that a custom affair?

You can also use VEMS instead of Motec. Full system inc. wiring, install and car setup is usually around £1k in our country. Shouldn't be much more in UK then!?

Of the three only on the Motec is there a base map available AFAIK, and it is the only proven one. It does offset the cost somewhat because a base map can be a couple of days work/labour to do, and in general tuners charge anything from £75/hour upwards.

Doesn't have to be. I noticed one on saito's site and have my italian tuning shop on the case.

But for an external waste gate it would have to be custom?

I like the sound of Motec. What other features does it have?

I not very bright me

Thanks

??