Hey Guys,

 

Srry but i am trying to learn about boost increase and how its achieved. (learning curve) am i right in thinking you need either one to increase boost to 14 psi? But which procedure is better? with the boost controller would you be able to have low and high boost setups?

depends on the type of power/set up you want from your car

 

if your just upgrading the ecu map and looking for 350ish ... then boost jets are the cheapest/easy way with out any problems ...

if your going for bigger power and your uprating stuff like IC/pullys/injectors/map/engine so on .. get a EBC

 

Mark

depends on the type of power/set up you want from your car

 

if your just upgrading the ecu map and looking for 350ish ... then boost jets are the cheapest/easy way with out any problems ...

if your going for bigger power and your uprating stuff like IC/pullys/injectors/map/engine so on .. get a EBC

 

Mark

 

That made it a lot simpler, thanks mark!

 

But i am guessing boost jets are permanent and you wont be able to adjust boost , e.g when you didn't want to stress the engine etc.

you buy different sized boost jets 1.0/1.1/1.2/1.3 so on smaller the hole more boost it will make think its 1.1 for about 14psi

Right i see, well thanks mark. I think boost controller would be better cause you can control boost on the go right? e.g while your driving!

yeah u can .. but all so u can be temped to crank a little more boost and run the engine little leaner ... just be careful in what u do and down run more than 14/15psi !!

 

Gizmo EBC seems to be quite good for the price

I've been wanting to know pretty much the same things to be honest... as a Turbo newbie :p

 

How does boost actually work? Is it the more boost you are running, the less "lag" you get out of the Turbos and therefore the faster you can accellerate?

 

Cheers

http://auto.howstuffworks.com/turbo.htm

HTH

Smithy

Boost and Lag are different things

 

Boost is more air being forced in to the engine with added fuel from remap u can run little more this = more power

Lag is how long it takes for the turbo to reach its full working set boost

 

so yes a car that is set to High boost levels say 20psi .. will have little more Lag than same car set at 15psi ...

but this can all so be affected by to big of a turbo for the engine

 

Big turbos = more power from the engine but the down side is they have huge amounts of LAG before power kicks in

the idea is to try and match the engine size/power with the ideal turbo to give you the best all round performance

a bit of info on jets: http://www.300zx.co.uk/forums/showthread.php?29063-Boost-Jets! ;)

 

a boost controller is obviously a better solution but I have run with jets for the last 10 years without issue! :)

boost controller is obviously a better solution but I have run with jets for the last 10 years without issue! :)

What makes you say an ebc is a better solution?

What makes you say an ebc is a better solution?

 

its more controllable so you can get a pretty much exact max boost pressure - no boost spikes or creep if set up correctly

 

you will in theory also get more power mid range as the wastegates will stay completely shut until the EBC opens them as opposed to a slow increase in pressure to the wastegates. Whether you will notice this in the real world is a different thing all together! :D

 

its also way more expensive so thats a big enough downside IMO!! :lol:

its more controllable so you can get a pretty much exact max boost pressure - no boost spikes or creep if set up correctly

 

you will in theory also get more power mid range as the wastegates will stay completely shut until the EBC opens them as opposed to a slow increase in pressure to the wastegates. Whether you will notice this in the real world is a different thing all together! :D

 

its also way more expensive so thats a big enough downside IMO!! :lol:

 

So its the cost is the main problem here, but i am guessing boost controller is better in the sense you can run in different modes like low boost medium or high? so if its raining you could lower your boost etc? were as boost jets its set depending on the size of it!

a bit of info on jets: http://www.300zx.co.uk/forums/showthread.php?29063-Boost-Jets! ;)

 

a boost controller is obviously a better solution but I have run with jets for the last 10 years without issue! :)

 

It can't be that easy! I wanted about 12psi on mine

My old JDM had boost jets and it was running around 16psi, went like sh1te off a buttered shovel. But you can't control the boost like a an EBC can and you can suffer from boost spikes. For choice I would always go down the ebc route. Which I did with my UK and a blitz sbc iD-III.

So its the cost is the main problem here, but i am guessing boost controller is better in the sense you can run in different modes like low boost medium or high? so if its raining you could lower your boost etc? were as boost jets its set depending on the size of it!

 

Ive ran boost jets and also ran a EBC on 2 different zeds, wouldn't worry about running lower boost due to rain, you just don't push the accelerator pedal harder, this controls boost well i found with boost jets and EBC, not really sure you would want to "give it the beans" in the wet unless you have a set of steel balls anyway, regardless of what you are running lol

 

Low and HI setting on the ECU would be beneficial if you are going to track your car. but if thats the case you will need more than just a ECU map and boost jets, well unless you dont plan on doing it to its full potential that is, also drag racing the car would be beneficial of having control over the boost. also if i was tracking my car, id be looking more towards a dry sump set up than a EBC so i didnt starve the engine of oil giving it the beans around a corner lol

 

Expense seems to play the biggest roll and also whether you will need to adjust the boost.

 

My blue one has a Greddy profec B spec II, and once id set it up for 11psi, i left it, so in theory, may as well of just stuck to boost jets. also Profec B spec II = around £200 to £300, boost jets (welding tips lol) = around £2

so what would be the optimum boost setting? Is there such a way of setting too much boost that it would cause problems with your engine?

 

I'm guessing that there's a standard "low medium and high" boost settings - my car has a boost guage fitted but no boost controller or boost jets... so I've never really paid that much attention to it.

 

On another note, I've seen manual boost controllers on ebay for about £20... guessing they arent very good for that price?

optimal boost would come down to what turbos you are running, what injectors you have and what map you are running, but if you have stock injectors, a chipped ecu, decats, airfilter and stock turbos, you would be wanting 14psi and below

 

Stock boost is 9psi

safetyt boost is 7psi

optimal boost would come down to what turbos you are running, what injectors you have and what map you are running, but if you have stock injectors, a chipped ecu, decats, airfilter and stock turbos, you would be wanting 14psi and below

 

I agree with my esteemed colleague :)

I thought 7/8psi was about normal. That is what mine is at right now does that mean I might be in safety boost?

I thought 7/8psi was about normal. That is what mine is at right now does that mean I might be in safety boost?

 

7psi is safety boost mate, standard boost is 9psi.

I thought 7/8psi was about normal. That is what mine is at right now does that mean I might be in safety boost?

 

are you using stock boost gauge or do you have a aftermarket one plumbed in, but 7psi would be safety boost, no doubt due to code 34 det sensor fault as the wire gets a lot of heat at the back of the engine and tents to go brittle inside hence throwing the code 34 error, its also one of the most PITA locations to work on if the car is in the zed, you would either have to strip the plenum, and lower plenum off the car to access it, if you dont have the engine out, or if the engine is out, renew the sensor and cable while you are there.

 

One thing i would say before upping the boost on any VG30DETT, would be get it checked over first make sure its a healthy engine as you put more stress on the components running at higher boost levels.

Ive ran boost jets and also ran a EBC on 2 different zeds, wouldn't worry about running lower boost due to rain, you just don't push the accelerator pedal harder, this controls boost well i found with boost jets and EBC, not really sure you would want to "give it the beans" in the wet unless you have a set of steel balls anyway, regardless of what you are running lol

 

Low and HI setting on the ECU would be beneficial if you are going to track your car. but if thats the case you will need more than just a ECU map and boost jets, well unless you dont plan on doing it to its full potential that is, also drag racing the car would be beneficial of having control over the boost. also if i was tracking my car, id be looking more towards a dry sump set up than a EBC so i didnt starve the engine of oil giving it the beans around a corner lol

 

Expense seems to play the biggest roll and also whether you will need to adjust the boost.

 

My blue one has a Greddy profec B spec II, and once id set it up for 11psi, i left it, so in theory, may as well of just stuck to boost jets. also Profec B spec II = around £200 to £300, boost jets (welding tips lol) = around £2

 

Right but on regular driving running on lower boost would it not save petrol etc? Or would just keeping your feet in control have the same effect.

 

Another doubt i had was if i was to do all the complimenting mods but do I have to have a massive 3-5" exits at the back? E.g if you decat a mongoose would it be just as good? or are the ends still too restrictive, due too being quads and smaller??

Right but on regular driving running on lower boost would it not save petrol etc? Or would just keeping your feet in control have the same effect.

 

Another doubt i had was if i was to do all the complimenting mods but do I have to have a massive 3-5" exits at the back? E.g if you decat a mongoose would it be just as good? or are the ends still too restrictive, due too being quads and smaller??

 

Not retrictive at all with a mongoose if you are just going to do the decat / ECU / Airfilter and boost jets / EBC. the mongoose is a good system, i was running 16psi with a mongoose system on my last cherry red zed.

Not retrictive at all with a mongoose if you are just going to do the decat / ECU / Airfilter and boost jets / EBC. the mongoose is a good system, i was running 16psi with a mongoose system on my last cherry red zed.

 

Thats pretty cool then, as i hate the massive exhaust look, prefer the quad look :), in terms of air filters are you talking about the thing under the nose panel??

 

its more controllable so you can get a pretty much exact max boost pressure - no boost spikes or creep if set up correctly

 

you will in theory also get more power mid range as the wastegates will stay completely shut until the EBC opens them as opposed to a slow increase in pressure to the wastegates. Whether you will notice this in the real world is a different thing all together! :D

 

its also way more expensive so thats a big enough downside IMO!! :lol:

 

Good answer!