Hey, my car has a full dec cat system, filter, JWT chip and boost jets but im just setting my boost controller up and was wondering what boost to run?

 

What do we think? current boost without controller is about 12psi

I'd take out your boost jets before fitting your boost controller if I was you!

 

If you have a stock bottom end and tubs, then set it to 14. Which, dependant on what size boost jets you have may equate to a similar boost pressure thus offering similar performance withouth the risk of the spiking you can get from the jets.

What cooling are you running ?.

Any upgraded Rad / IC's ?

no all stock cooling.

Shall I stick with my boost jets as there is not really much point putting the boost up by 1 psi

Boost controllers are safer than boost jets. I looked at fitting boost jets. Whilst some people swear by them, others have had engines die because the jets have spiked popping gaskets or causing ring gland damage. Depends how the engine was treated in earlier life I'd guess and what map you were running.

 

Boost controller for me.

 

If you intend on upgrading the internals later, then a boost controller is a layout you won't have to find when you come to setting the boost even higher.

im happy with the power at the min.

So for safety im prob better removing the boost jets and running the controller at about 14psi.

Now, how do you remove boost jets?

A boost controller also allows the boost to come on quicker and stronger, compared to jets.

 

You will notice a performance difference going from 12psi with Boost jets to 14psi with a Boost controller.

 

Then there is the ability to turn it down when wet or when somebody else drives the car. Plus when you consider that most Boost controllers include a built in Boost gauge then you dont need to spend £100 out on a Boost gauge and Pod.

Edited September 29, 200817 yr by Yowser

. Plus when you consider that most Boost controllers include a built in Boost gauge then you dont need to spend £100 out on a Boost gauge and Pod.

 

Even with the older smaller stuff Dave? The likes of Greddy's Profec a and b and HKS's EVC 4?

yeah mine is a brand new greddy one but iv got piller guages anyway.

You have convinced me to go with the boost controller! Now as I didnt fit the boost jets, how do you disable them?

However, with boost controllers there is always the 'fiddle factor. "Hmmm, wonder what it'll run like at 15.5 psi?" "Bugger ..."

Has anyone with 555's on stock internals run any decent amount of boost with out popping their engine? I'm assuming it's the fuel mixture leaning out, causing detonation after 15.5 psi, which kills the engine on stock injectors?

IIRC Stock injectors max out around 14.5 psi.

Stock tubs run out of puff around 15.5 psi.

 

Always best to have a saftey margin rather than pushing the car to the absolute limits.

I think il stick to 14psi, safe and sound pkus I never push it to the limit when im driving it.

Anyone know about the removal of boost jets?

http://www.ttzd.com/tech/ecutech.html

 

^ A guide on how to fit them

Has anyone with 555's on stock internals run any decent amount of boost with out popping their engine? I'm assuming it's the fuel mixture leaning out, causing detonation after 15.5 psi, which kills the engine on stock injectors?

 

I'm sure guys in the US have had 450~500+hp @ crank out of a stock bottom end.

 

Make no mistake, the mapping will have to be spot on at this level or the pistons will just turn to chocolate LOL

 

Even so, people think that aftermarket pistons are det-proof. Fact is they're not. They can handle higher amounts of det yes, but they're not 100% bullet proof.

I'm sure guys in the US have had 450~500+hp @ crank out of a stock bottom end.

 

Make no mistake, the mapping will have to be spot on at this level or the pistons will just turn to chocolate LOL

 

Even so, people think that aftermarket pistons are det-proof. Fact is they're not. They can handle higher amounts of det yes, but they're not 100% bullet proof.

 

Yep, infact 500+ at the rear wheels which is nearly 600 at the crank on stock internals from a few guys in the U.S. Not something I would personally want to risk, but been done a few times. Its all about the Mapping.

 

Stock turbo's max out at around 18psi. Injectors at 15psi. Intercoolers at around 15psi.

Edited September 29, 200817 yr by Yowser

Yep, infact 500+ at the rear wheels which is nearly 600 at the crank on stock internals from a few guys in the U.S. Not something I would personally want to risk, but been done a few times. Its all about the Mapping.

 

Stock turbo's max out at around 18psi. Injectors at 15psi. Intercoolers at around 15psi.

 

Wow, I didn't realise it was that much!

 

I know what you mean though, any slightly off petrol and you're pistons are toast.

 

I should be ok for 400 on mine then :D

as said above, remove jets before installing EBC, then run 14.5psi (1 bar) tops on your setup. sadly the next hurdle to running bigger power costs ££££££s in terms of forged pistons, radiator, intercoolers, injectors and turbos :(

Has anyone with 555's on stock internals run any decent amount of boost with out popping their engine? I'm assuming it's the fuel mixture leaning out, causing detonation after 15.5 psi, which kills the engine on stock injectors?

 

 

Z1 have over in the states. There's a chap over there running over 500bhp on stock internals.

 

Runs 13.5 PSI on regular pump fuel = 411.07 rwhp.

Then on race fuel @ 23.1 PSI = 540.28 rwhp

 

 

He runs 740s though.

thats mad, lets all get some rece fuel!!!!

Z1 have over in the states. There's a chap over there running over 500bhp on stock internals.

 

Runs 13.5 PSI on regular pump fuel = 411.07 rwhp.

Then on race fuel @ 23.1 PSI = 540.28 rwhp

 

 

He runs 740s though.

 

What turbos is he using?

Im going to remove the boost jets today, what do I do about the JWT chip? shall I just leave that in and just set up my boost controller?

 

From what I can see on some pictures, the boost jest are in some kind of vacume pipe near the throttle body inlet, is this correct?