HI

 

Im after 400 bhp at the flywheel have you guys got any idea what sort of 0-60 time i will be looking at everything else i standered except underdrive pulley the mods im gettein to achieve this are

 

2.5" straight through pipes

JWT ECU

JWT Twin pop charger

underdrive pulley

new cat back exhaust

 

Thanks

Dont think you get 400bhp simply with that setup. Maybe if you lost your cats and doubled your boost to say 14PSI. With 400bhp 0 -60 depends if have an auto or manual. but I am guessing around early 5s.

iv got a similar set up, got a timed 4.8 secs 0-60 :)

HI

 

Im after 400 bhp at the flywheel have you guys got any idea what sort of 0-60 time i will be looking at everything else i standered except underdrive pulley the mods im gettein to achieve this are

 

2.5" straight through pipes

JWT ECU

JWT Twin pop charger

underdrive pulley

new cat back exhaust

 

Thanks

 

 

You wont be anywhere near 400bhp at the fly with those mods. The turbos will have to be turned up to 1 bar at least.

 

The Twin pop wont do that much unless you are pulling a lot more power. I also think the twin pop ECU chip is for Nismo 555cc injectors and not stock ones. So if you put that chip in, the car wont run right and could also damage the engine.

 

Stuart

HI

 

Im after 400 bhp at the flywheel have you guys got any idea what sort of 0-60 time i will be looking at everything else i standered except underdrive pulley the mods im gettein to achieve this are

 

2.5" straight through pipes

JWT ECU

JWT Twin pop charger

underdrive pulley

new cat back exhaust

 

Thanks

You could try and remove the back seats and dump the aircon.

 

On a serious note Stu is dead right, Pop down to SE Nissan, £260ish later you will be running 1 bar. If your tubs are not in top condition forget it. If you have this upgrade and remove the cats you will not only reduce your back pressure (which is good) but you will also put the tub oil seals under alot of stress. The stock seals require a certain amount of backpressure to seal correctly. Iam speaking from experience here "smoky on the water" ECU CPU twin pops are normaly used to squeeze the last bit of power from the engine ie:fine tuning..Just stick with the single Blitz SUS and a JWT CPU for starters, decat pipes, performance zorst 3"", 1 bar of boost then you will be on your way.

You could try and remove the back seats and dump the aircon.

 

On a serious note Stu is dead right, Pop down to SE Nissan, £260ish later you will be running 1 bar. If your tubs are not in top condition forget it. If you have this upgrade and remove the cats you will not only reduce your back pressure (which is good) but you will also put the tub oil seals under alot of stress. The stock seals require a certain amount of backpressure to seal correctly. Iam speaking from experience here "smoky on the water" ECU CPU twin pops are normaly used to squeeze the last bit of power from the engine ie:fine tuning..Just stick with the single Blitz SUS and a JWT CPU for starters, decat pipes, performance zorst 3"", 1 bar of boost then you will be on your way.

 

 

Just use mig tips, £2 from local welding suppliers store,

Mike

Yea I have noticed that alot of guys use these, dont know how good they are

Using mig tips what the max boost you can expect?

Also were in the system do you fit them?

and when I had boost jets everyone on the forum (and a couple of independent z specialist mechanics) all said GET RID QUICK!

 

So I did and the car runs very nicely on stock boost just now. Next purchase is a proper boost controller, which is what you all said I should get!!!!!!

 

Oh you're so fickle!

What are these mig tips and what do they do.

 

Boostsolutions have told me they can supply me a chip which will give me 349hp at the wheels. They said theres is more optimised than JWT and its at s lot less $200 and i dont have to send my ecu off do you think i should give it a try or stick with JWT a name you can trust

What are these mig tips and what do they do.

 

Boostsolutions have told me they can supply me a chip which will give me 349hp at the wheels. They said theres is more optimised than JWT and its at s lot less $200 and i dont have to send my ecu off do you think i should give it a try or stick with JWT a name you can trust

 

Mig tips / boost jets / bleed jets / boost tips / any other combination of these words are all the same thing.

 

A turbo uses exhaust pressure on one side to spin a turbine which compresses the fresh intake on the other side. Boost needs to go up and down depending what the car and throttle/fuel are doing so you need a way of controlling how hard the turbos are working.

 

In the Z you control this by changing the amount of exhaust gasses passing the turbo. Think of it like a water wheel with a sluice gate above it - raise and lower the sluice and the water wheel turns the millstone faster or slower, giving you more or less flour power (sorry :rofl: )

 

So, more exhaust to the turbo = more boost in the intake.

 

The difference is that the sluice gate in the turbo works backwards - there's actually a "leak" just before the exhaust reaches the turbo, and when the gate (called the wastegate) opens the leak gets bigger and less exhaust spins the turbo itself. The leak starts (ie the wastegate opens) at a certain pressure. This is a bit like the overflow at the top of the millrace, and the wastegate pressure is like the height of the sill on the overflow. Dig the sill deeper and more water goes down the overflow, and less reaches the waterwheel.

 

A boost jet introduces an extra leak near the wastegate, so that that wastegate sees a lower pressure than the pressure actually passing the turbo. You are deliberately introducing a leak to confuse the wastegate. (Remember this is on the exhaust side - you're not creating a leak in the intake...)

 

With boost jets the pressure at the WASTEGATE will be lower than the pressure actually DRIVING THE TURBO. In other words, you've frigged it so that the boost pressure the turbo THINKS it is on bears no resemblence to the real pressure. The turbo still thinks it's generating 9psi on the intake side, but actually it's generating 15psi... Doesn't sound good, does it?

 

My cunning waterwheel analogy falls apart here because water pressure tends to be the same everywhere, whereas in air you can have a local drop... but then the design of the Z assumes the exhaust pressure is the same everywhere, and we've just deliberately frigged it so it isn't. It's like digging the overflow water channel deeper and yet mysteriously no more water actually escapes...

 

This sounds like a crap way of raising boost - because it is. :)

Mike

Yea I have noticed that alot of guys use these, dont know how good they are

Using mig tips what the max boost you can expect?

Also were in the system do you fit them?

 

LOL.........what do you think SE use for their "boost upgrade" ?? You said yourself to get down there! Then you said you don't know how good they are. :eek: :D

 

A boost controller is the safest and most effective way of raising the boost.

The tips do work but are just a bit crude. I had an SE upgrade about 3 years ago with no probs but have seen the light with a nice GReddy boost controller.

Nos........have a look here http://www.zhome.com/ZCMnL/PICS/boostJets/boostJets.html

Mig tips / boost jets / bleed jets / boost tips / any other combination of these words are all the same thing.

 

A turbo uses exhaust pressure on one side to spin a turbine which compresses the fresh intake on the other side. Boost needs to go up and down depending what the car and throttle/fuel are doing so you need a way of controlling how hard the turbos are working.

 

Thread hi-jack..................

 

thank you for that explanation

As a mech-ignorant I have no idea about half of what goes on under the hood, but now I at least under stand what's happening. :dance:

 

NOTE: can we have regular leasons? :bow:

 

 

End thread hi-jack...............

OK - a great description, but a little inaccurate! Mig tips/boost jets do NOT create any boost leak, they are not bleed valves!

 

they work by creating a restiction in the pipe back to the wastegate, boost contollers do this also (admittidly more efficiently).

Ok ok ok time for an FAQ on boost control I reckon ;) Zevans - ALMOST spot on just needs a little bit of 'tweaking' mate ;)

Ok ok ok time for an FAQ on boost control I reckon ;) Zevans - ALMOST spot on just needs a little bit of 'tweaking' mate ;)

 

I was thinking of a likkle diagram too. ;) I'll do one in front of the telly at some point...

 

...but not until I've REMOVED my boost jets I "inherited" on the car! (Hose from Smithy coming tomorrow :dance: )

I was thinking of a likkle diagram too. ;) I'll do one in front of the telly at some point...

 

...but not until I've REMOVED my boost jets I "inherited" on the car! (Hose from Smithy coming tomorrow :dance: )

 

Nice description mate - I almost understand what's going on now... More please with piccies!

 

I was going to get a boost controller until the Thor RR day. They showed me running 14.6psi with the SE "Boost Upgrade". I'm happy to keep it that way for the time being..

 

CheerZ

 

Steve

Steve....did you look at the link I posted up? Some good pics and info.

 

http://www.zhome.com/ZCMnL/PICS/boostJets/boostJets.html

Steve....did you look at the link I posted up? Some good pics and info.

 

http://www.zhome.com/ZCMnL/PICS/boostJets/boostJets.html

 

Sorry james - I missed that link. Looks good though and I'll be able to have a proper read later on today!

 

CheerZ

 

Steve :D