Increase boost

[steelie600]

fairy nuff, but my own understanding of turbo engines is that for the little power increase just upping your boost by 6 psi gives its not worth the effort. But each to there own and again I know nothing.

[Atik]

Thing is, 6psi is more than enough to make your car go bang!

For an additional 6psi of boost, you could get a peak power increase of a single horsepower but your car could now run like a bag of spanners! If your combined components cannot handle the 6psi efficiently, there is no point in having the 6psi is there? By all means, feel free to ignore the advice, but these things have been tested time and time again.

[steelie600]

i never said i was ignoring the advice atik, its just that i have worked with turbo engines petrol and deisel all my working career, and I am proficient in tuning engines. Horses for courses mate. Maybe prevention is better than cure its just my opinion doesnt conform to the cliques yet again

[Atik]

Maybe prevention is better than cure

Thats what it is! The recommendation is that prevention is better than cure. A set of 7 series plugs for £40odd and the few hours to replace them? OR fix a broken engine cos the extra boost couldnt be handled by the current components?

Call in an electrician to fix the damaged light fitting? OR attempt it yourself, get electrocuted, short out the electrics in the house, then call the electrician in?

[chiro]

There is a noticeable difference from going from stock boost to say up to 1bar or 14.5psi. Its a massively noticable difference and you will shave off at least 1s to 1.5s off the quarter mile time.

Up the boost to a more manageable 0.8bar or about 11-12psi and you will be looking at a noticeable boost improvement and up to a second or so.

You wont get figures from anyone but expect to go from 260bhp to about 285bhp by upping from stock to about 12psi. That said, you might not get any performance improvement. It MASSIVELY depends on how well the car is tuned to receive the extra power.

Thank you, this is the sort of info I was after.
Looks like I'll be fitting a boost controller sometime soon

[Ryan]

Chiro: Maybe fit a boost controller of some kind (and boost gauge too preferably), organise a dyno and then put your car on with stock boost and do a couple of runs with continued increase in boost until you hit fuel cut - then you will see what a difference (in HPatw) terms it makes.

[Turbo_Steve]

This thread is amazing. Truly amazing.

Chiro, as Atik says, 6psi is a fairly hefty increase, and as such will transform the car: you're moving into the peak efficiency range of the turbos, which means a LOT more flow, decent temps and a lot more "area under the curve" on the dyno, which in turn makes a much faster car.



Atik, a couple of (minor) corrections:
7's are a colder plug than 6's. I'm nit picking, though!
Whilst an MBC and an EBC will give you very similar results, the general advantage of the EBC (and the reason it's about £150 more expensive) is that you can adjust the curve to get MAX boost without peaking for as long as possible. A mechanical controller tends to overshoot a little, and then fluctuate around the target a little more.

Again, I'm being nit picking.


Steelie......you run 6's and you might be fine. Of course, if you're NOT fine you'll end up with a misfiring bag of nails that's nasty to drive, and over heat your plugs and have to change them all anyway. Unless one of them fails and drops it's anode into the bore whilst the engine is at 5000rpms. That can be considerably more expensive than upgrading the plugs to start with.

Frankly, it's not "your opinion differing from the Clique" in this instance: your opinion was simply straight wrong. It's no more prevention than putting in the right oil or fitting strong enough big end bolts.

[Atik]

Turbo_Steve > < ME

I knew they were one way or the other

[AlanDITD]

i changed my plugs to a grade colder before i even upped the boost.....i thought everyone did!

[Turbo_Steve]

LOL @ Atik.....I still can't see the logic in it.
Colder plugs...run..hotter cylinder temps? Right? ARRGH!

[Atik]

LOL, see your technical knowledge is so much better than mine! I was just trying to make my point and got it the wrong way round, so sue me! At least I dont ride a pushbike with a basket on the front

[chiro]

So new sparks before upping the boost then, got some quite useful infomation in the end

[Atik]

Yep, get some new plugs and get the car serviced and all oiled up with good spec oils etc. Then you can start playing with power mods without worrying too much of running 'cold plugs in a hot cylinder'

[orionn2o]

OR attempt it yourself, get electrocuted, short out the electrics in the house, then call the electrician in?

Of course you know its harder to call an electrician in if you are dead!