OK,

 

Soon will be the time to rebuild my 300zx. Looking at what sort of price i am likely to pay for:

 

-turbos that can handle up to 500bhp at the wheels (was looking at JWT 530BB's)

 

-Split fire coils (if i need them)

 

-Forged pistons. (Wosner or weisco?)

 

-555 injectors

 

- stronger rods (If i need them)

 

-Stronger crank (if i need it)

 

-and a chip/ecu to support these mods

 

-last but not least a fast auto box or a strengthening kit for my existing box (valve thingies - not sure what they are called)

 

what am i looking to pay for these? I have found some on ebay for descent prices but does any of the traders sell upgrade kits that include most of these? If not do traders have any of these that they are selling? (obviously injectors first so i can still run the car for the meantime)

 

I have noticed that if i do forged pistons, injectors and split fire coils i can get them to around £1500 (that's based on me doing everything myself)

 

I will email Jimmy to see what he can do as i have heard good comments on his rebuilds

You wont get 500 rwhp out of the 530bb's, not in the UK on pump fuel. 450rwhp is achievable.

 

If you really want 500rwhp then you'll want to consider the HKS GT2530 (or Z1's equivalent which is the GT675RS)

 

A typical upgrade list would be :

Wiesco Pistons

Eagle Rods

Cometic headgaskets

New stock or ACL Race bearings

Uprated Valve springs

 

I would defiantly go for MS/AMS Manifolds too.

 

There are a lot of extra's you will need to include for the rebuild - Cambelt, waterpump, thermostat, Full engine Gasket set, Tensioner, Idler pulleys. Engineering shop costs - Engine bloke rebore. Head skim and pressure testing.

 

Depending on budget you may want to consider having work done improving flow around the heads and upgraded Cams. Its also a good idea to get some of the flashing removing from the block and head waterways for improved cooling.

 

555 injectors will be ok if you go for the 530bb and 450rwhp, but you will want to go for bigger injectors if you really want 500rwhp+ and bigger tubs. if you go for bigger injectors then you will need a different fuel rail, either the stock 94onwards fuel rail or something like the 360 Fuel rail.

 

Stock Crank is good for double the power your asking.

 

I wouldn't bother with the Spitfire coils, unless you have plenty of money left afterwards. Its not a typical upgrade option. I hear the skyline boys have some good results with them though.

 

John Dixon offers custom mapping services of your stock ECU on a dyno. The other option is to go for a standalone ECU Management system such as the AEM.

 

For the gearbox your best bet is ringing around Gearbox specialists in Yellow pages and seeing what they can offer. Expect to pay 1500-2000 though.

Edited May 26, 200917 yr by Yowser

ok so lets say i go the GT675RS route,

 

i will need eagle rods, bigger injectors (740- is that what they are?), cometic HG,

 

forged pistons and a mapped ecu for that?

 

will that be ok?

ok so maybe i should add.

 

uprated fuel pump, uprated oil cooler for gearbox (should do that anyway)

however what should i do in terms of the autobox with this power. You have already advised me that my box xould fail even on standard power. What would be that best way to sort the box out? i know most people will say manual but my wife loves having fun in the car when she is out and about and would prefer an auto. what is an fast auto box gonna cost me?

Yes, bear in mind that 500rwhp is a LOT of power. There are only a handfull in the UK with around that power and there is a lot of work and money involved.

 

You could get away without upgrading the rods, but with the engine already in pieces then for a little extra its a lot more piece of mind. They have other benefits, like being lighter too helps with engine response and revving.

 

Definatly go for the manifolds too (they are around 400) as the stock manifolds are too restrictive for the bigger turbos.

 

Standard fuel pump is as high flowing as any aftermarket pump and your within the fueling limits. When the limit is reached then the option is to go for a 2nd fuel pump with swirl tank to keep adequate fuel flow.

 

A typical standard autobox rebuild costs around 1200, so your looking at 1500-2000 I would estimate for a fastroad rebuild. Thats a complete estimate, its not something I have looked into before. The only persons I know of that have has a Fastroad box in the UK is Mac_1, Ryan@ztech, Mrogers and Speedfreak. However that was just one gearbox, that each of them owned and sold over the years !. I've no idea where that box is currently as speedfreak was the last to have it but his car has since been broken for parts.

Edited May 26, 200917 yr by Yowser

Check out the link below. Its to one of the most respected 300zx engine builders in the U.S and it gives you a good idea(list) of parts and work that is carried out on a High end rebuild.

 

The stage 5 option is the route I would take for the most potential but any of the stages offer reliable support, although stage 1 & 2 only include stock rods.

 

http://www.importpartspro.com/vgloblpa.html

 

See what Jimmer can offer, he is a top bloke and has a very good reputation here.

Edited May 26, 200917 yr by Yowser

I thought the jwt 530bb turbos (the same as mine) can handle 530rwhp absolute maximum, SMW1 has them and maxed the dyno out diddnt he?

I thought the jwt 530bb turbos (the same as mine) can handle 530rwhp absolute maximum, SMW1 has them and maxed the dyno out diddnt he?

The U.S power figures for all turbos are way off what anyone in the UK has ever achieved, and are usually done using Race fuel.

 

I cant find SMW1's thread, but I think his result is Flywheel HP.

If you go for bigger injectors then you will need a different fuel rail, either the stock 94onwards fuel rail or something like the 360 Fuel rail.

 

 

I see that the 94 onwards fuel rail is cheaper than the 360 fuel rail from Z1. If your looking at 500rwhp+ would the 94 onwards fuel rail be ok to use with 740cc? I know that the lower plenum needs to be machined still. but doing it this way could work out slightly cheaper.

 

Sorry for hijacking your thread.

 

cheers,

 

Ant

no worries bud :-)