Im looking to get approx 400bhp from my z. What mods would be the best taking into account the following:

UK spec TT 92 manual.

Car is my only mode of transport so needs to be reliable-i travel approx 45 miles a day to and from work.

Budget is limited as most of my money goes on day to day running.

Car is stock at the moment.

Was contemplating induction kit,de-cat pipes and boost upgrade.

Would de cat pipes present a problem with turbo seals? Have heard that the reduced back pressure allows oil to bypass the seals-is this right?

All help and advice greatly appreciated.

New exhausts, chipped and booster would give it over 400BHP and then the fun starts.

Decatting is a big debate do a search and you'll find plenty of info.

It really depends on the state of your turbo seals etc.

I did it in the end after much debate.

Geoff.

People always ask for ways to make engine more powerful but still reliable for cheap. It cant really be done. The more power you have the more stress you have on engine parts and they wont last as long. The only way around it is to change the internal parts for stonger ones which will cost you mega £££.

 

The basic way to get good power from the car is

 

Exhaust £500,

Induction Kit £125,

Decat Pipes £200,

ECU Chip £150 - £500,

Boost Controller £400,

New Clutch £350

 

(all aprox costs and not including fitting)

 

With this set up you should be close to 400bhp. More likely 380 +\- 20bhp or so depending on the condition of the engine.

Dont expect your car to be as reliable as it is now. Modifying it this much is putting quite a bit more stress on the engine components and things like injectors and turbos will be close to the limit.

I am not saying your car will become ultra unreliable. All engine will break. Modifying it will make it break sooner.

 

 

One last thing though. I roughly have the set up listed there and I am forever wheel spinning. Flooring it in 1st and sometimes 2nd causes a wheels spin because I am still running stock wheels and they are just not wide enough.

 

 

Stuart

To get to 400 you would rerally need to get bigger turbos and injectors and if you are going this route you might as well go to 500 because it would cost the sameish!

 

As stuart says the above outlay will give an enjoyable car that will arive at a figure that is close to the 400 mark!

 

I would be more optimistic about the reliabilty, I think the Zed engine can handle more bhp!

Thanks guys.

Dont want to take her over 400 cos i thought this would really be the limit for keeping reliability. There is always a safety factor built in for those who dont understand the basics of metal fatigue and oil. Am rather careful as far as planting my lead foot until such time as oil temp is up.

Can anybody suggest places to purchase the relevant parts and which are the ones that seem to be the best at reasonable cost.

Originally posted by HTJIM

Car is my only mode of transport so needs to be reliable-i travel approx 45 miles a day to and from work.

Budget is limited as most of my money goes on day to day running.

 

If you need a daily driver and have a limited budget, you need to think long and hard before doing any mods. The search for cheap power rarely increases reliability.

 

At best, it uses up all the money you will need when "normal" things go wrong or need maintenance: belts, water pump, plugs etc etc

 

If you want to go faster and enjoy the drive more, a few quid spent on an advanced / high-speed driving course is much better value. IMHO.

 

Cheers - Gio

I've got about 400bhp and pretty much got the main things... Exhaust (3" straight through - decat)

Apexi induction

Custom chip

Boost controller running 15.5 psi (max), daily driving is set to 12.5psi.

 

I'm now not really going over 12.5psi as I want to now invest time and money getting a good wide band O2 and det sensor.

 

My personal opinion is that if you can make sure your car is not suffering the realiability will be far better.

I think we should put things into perspective here, the zed engine was seriously detuned to get to the japs "agreed" 280 bhp limit, i think 400bhp is more what it would of produced if the limit was not in place.

 

many of the mods at this level (zorst, intake, chip) increase power by making the engine more efficient, & the boost pressure on a stock zed is seriously low for a performance turbo car, 1 bar is really not that excessive IMO.

 

now the only time youre putting more strain on the engine is when your on more boost than stock, & how often is that?? & is the extra 4.5 psi or so really going to make that much difference??

 

400bhp (flywheel) really is entry level tuning on a zed, makes a nice improvement over standard, but nothing too extreme!!

 

just my £0.02 worth :cool:

400BHP!

 

I have never heard or seen anyone with 400BHP with the basic mods!

 

SE roliing road day springs to mind!

Originally posted by HTJIM

Can anybody suggest places to purchase the relevant parts and which are the ones that seem to be the best at reasonable cost.

 

Have a look round our own traders section, Chris@GetGReddy and Smithy can get you all sorts off that list ;)

Originally posted by TopLess

400BHP!

 

I have never heard or seen anyone with 400BHP with the basic mods!

 

SE roliing road day springs to mind!

 

Mark, i had 350 with my tyres still smoking!! :o the RR operator estimated mine at around 400 without wheelspin, maybe a little optimistic, but 380ish is quite realistic i would have thought, couple that to an engine that is a little fresher than mine & 400bhp seems very achievable! :)

Originally posted by TopLess

400BHP!

 

I have never heard or seen anyone with 400BHP with the basic mods!

 

SE roliing road day springs to mind!

 

I was dyno'd at 400bhp a couple of weeks before the SE Day, at .7bar on my old setup. Then I spent 2 grand and made 32 brake less. Ah happy days:rolleyes:

this is an intresting read the early NISSAN MID4 prototype had a 330 bhp engine in it MID4

Originally posted by TopLess

400BHP!

 

I have never heard or seen anyone with 400BHP with the basic mods!

 

SE roliing road day springs to mind!

 

Well I had 334 BHP with 9psi, now I'm running 15.5. I reckon that's gotta be up there mate ;). We'll find out @ Thor :D. Fingers crossed.

 

PaulC got something like 350 ish at 4krpm before his plastic tyres started kicking in.

 

B.O.B. car's will show you the light :rofl:

mine came in at 332 bhp got a custom chip got it upto 381 bhp a good improvement but way of 400 and running out of things to bolt on. have induction, straight thro exhaust, boost upgrade, custom chip and at a guess running 17-19psi if you had this lot plus under drive pulleys, fan removed for electric might get to 400 ?

Originally posted by russ

mine came in at 332 bhp got a custom chip got it upto 381 bhp a good improvement but way of 400 and running out of things to bolt on. have induction, straight thro exhaust, boost upgrade, custom chip and at a guess running 17-19psi if you had this lot plus under drive pulleys, fan removed for electric might get to 400 ?

 

you could also fit a lightwieght flywheel (i have ;) :cool: ) & de-cat

Adam I thought you had aftermarket tubs and injectors though!

 

I am just talking about the basic mods!

 

Again all we are talking about here gents is speculation!

 

Get on the dynos and SHOW ME THE MONEY:D

Is it too far away to post the "What BHP will you make at Thor?" thread? :D

 

I got 348BHP (and 403, 397, etc ;) ) at the SE one @ 12psi, now running 15psi (and a grounding kit!!!) so I'd hope for 375/380 - not far off 400BHP :cool:;). I've got stock turbos, intercoolers, injectors.

 

It certainly feels a lot quicker at 15psi than 12, especially at higher speeds.

 

Pete

LOL @ the random number generator thread :p:D

 

Stock turbos/ICs etc etc will be very hard pushed at 400bhp. Although whats the question here? Is it 400Wbhp or crank bhp? Crank bhp WOULD be possible at around 15psi and a properly set up chip but for certain not at the wheels!!! That rolling road day was a joke too IMO - the "out of thin air" crank estimations were stupidly high.

 

I'm running 0.6bar at the moment on PE1420 turbos. Looking at the flow charts for those turbos, I am putting about 360bhp @ the crank. Stock turbos are NOWHERE near efficient at 15psi as they are at 9psi - the compressor starts to become completely useless at 17psi as it heats the air rather than compressing it. Yes, 6psi is a large increase in boost pressure BUT in terms of actual air flow, there is not a lot of increase. The more air you get in an engine, the more power you will get out of it - as long as there is adequate fuel for that amount of air LOL. Stock ICs are also a bag of sh1te. Couple the bad ICs with the turbos running well outside their efficiency zone, and you will find that there isn't that much increase in power ;) Also never forget that wear will decrease the power of the engine too ;)

 

CheerZ,

 

Andy

crank bhp Andy ;) (thats what im talking about anyway)

Yeah the dyno guy had his wheel spinometer there as well:D

Still difficult to achieve m8!!! If you DID manage it on stock tubs etc, then the turbos would be right at the edge of their performance envelope and won't last long at all...

Think we're all talking at the crank ;)

Originally posted by pete shrimp

Think we're all talking at the crank ;)

 

Still diffcult to achieve!

Ok, Ok, lets not get cranky about it :rofl:

Ok firstly a quote:

 

Stock injectors for VG30DETT is top feed 370cc. At 3 bar fuel pressure, they max out around 350rwhp or 400bhp. More power might be realized by raising fuel pressure.

 

 

This is taken straight from the first line of this page http://www.ztechz.net/turboupgradeforvg30dett/id5.html

 

So for a start at 400bhp your stock injectors will be MAXXED out.

 

Secondly, stock turbos will flow 304CFM each, totalling 608CFM. At 15psi, the engine demands 761CFM at 7k rpm. Even at only 6k revs it requires 652CFM. So stock turbos are well out of efficiency at 15psi! Hmmm yet at 10psi, the engine demands only 630CFM, thats strange I wonder why they set stock boost to 9psi ;) Thats because this is where the turbos are at their MOST EFFICIENT operating range. Increasing the boost pressure from stock will only give small increases in power as the compressor is using more energy to heat the air rather than simply compress it.

 

Make any sense?

 

CheerZ,

 

Andy