raising boost?

[AJI]

Are Nobles easy to tune by raising boost levels via boost controllers?
I know they are fast enough as they are but do the turbo's run at max safe pressure level when they come from the factory or can more boost be sent through them with no real immeadiate damage?

[washy]

Depends which model you're talking about. I think the M400 is at the max if you don't upgrade in other areas too. Not so sure but I think the 2.5's and 3's may be worth a modest boost tweak.

Someone who knows more will doubtless give more detail soon.

[JLSELAN]

Certainly is done in the U.S. where the importer offers an optional ECU map for the M12 that increases boost and takes BHP to 400. Also see various posts on
www.nobleforums.com

[Doug Axelrod]

define "real immediate damage."
Doug in Cincinnati

[GTWayne]

Raising the boost pressure is one thing but without increasing the fuel delivery rate will undoubtedly cause damage,immediate or otherwise,detenation being one key factor straight of the bat.Fuel injection systems are usually O.K. for an additional 25% air flow increase with extra performance on hand within the injector but I would ask somone that has first hand experience before attempting any D.I.Y.

[ThatPhilBrettGuy]

Most cars are on the edge or running lean as standard (due to fuel pump / wiring issues). I think most non-remapped noble engines that have run more boost have had 'limited' lives.

[Ash M400]

The above two posts I agree with. Beware, your Noble WILL run lean if you up the boost. You will then kill the CATS, valve springs, spark plugs and do untold damage to teh engine.

If you do it, upgrade the fuel pump AND the wiring to the pump.

[JLSELAN]

Ash M400 said:

The above two posts I agree with. Beware, your Noble WILL run lean if you up the boost. You will then kill the CATS, valve springs, spark plugs and do untold damage to teh engine.

If you do it, upgrade the fuel pump AND the wiring to the pump.

Probably true for an M400, but the M12 "boosted/remapped" to 400 BHP in the U.S. does just fine AFAIK.

[Ash M400]

JLSELAN said:

Ash M400 said:

The above two posts I agree with. Beware, your Noble WILL run lean if you up the boost. You will then kill the CATS, valve springs, spark plugs and do untold damage to teh engine.

If you do it, upgrade the fuel pump AND the wiring to the pump.

Probably true for an M400, but the M12 "boosted/remapped" to 400 BHP in the U.S. does just fine AFAIK.

Don't know the answer to that, if so, go for it. May be different wireing for the US machines?

[brav]

FWIW, we have the same wiring issues with the fuel pump in the US. many have upgraded it, let alone an adjustable fuel pressure regulator

[adrian w]

Hmmmmm......................been here before, just increasing the boost will break it, and in the case of the M400 very quickly. If you want it to produce more power you will have to get the engine upgreaded properly.

[gotapex]

JLSELAN said:

Ash M400 said:

The above two posts I agree with. Beware, your Noble WILL run lean if you up the boost. You will then kill the CATS, valve springs, spark plugs and do untold damage to teh engine.

If you do it, upgrade the fuel pump AND the wiring to the pump.

Probably true for an M400, but the M12 "boosted/remapped" to 400 BHP in the U.S. does just fine AFAIK.

When you buy this in the US, it comes with the M400 fuel pump as well, not just the MAP.

[brav]

Also - my car was overboosting to 1.4-1.5 BAR. Fast as hell (until it cut the power on itself), but ultimately I lost the engine. Damage: 2 cracked pistons. SURPRISINGLY, the top end was near perfect - and this was thought to be the weak point. Did a flow and pressure test, came out fine. Damage was to the pistons and cyl walls. Theyre mayyyy be room to run another .1 to .2 BAR, but you would definately want an air-fuel ratio gauge (such as I have) to keep an eye on things, and upgrade fuel delivery.

on a 3R, your turbos will make more boost, but it will die out and wont be sustained over 5500 RPM or so. An M400 will make more top end.

If you change the boost controller, you will lose the abilitity of the ECU to cut boost in less than desireable conditions. However, it still can cut timing. Not sure how critical the boost reduction would be.

Heres a pic of the gauge I installed on the A-pillar which runs off of that little box near the shifter (which also datalogs many inputs such as EGT, boost, etc.)

Edited by brav on Monday 12th June 18:44

[gadgeroonie]

if you want to raise the boost - get it set up by a professional who has a Rolling Road / Dyno that logs Air Fuel ratio against RPM and boost presure

Hope this helps

[AJI]

cheers for the info guys.

I was just curious as to how much 'play' you have with the power levels before you have to go and upgrade/replace other components.
The easiest way generally on turbo cars is to increase the boost, but it sounds like the Noble already has this set at is max level. (well max level before other components/systems intervene).

[gadgeroonie]

a boost upgrade with some extra fuelling can yeild nearly 400 bhp with the correct exhaust and intercooler

I suggest you do the exhaust and intercooler first - that way you will get great results when you decide on more boost

Edited by gadgeroonie on Thursday 15th June 18:37

[mgbond]

My understanding from all the experts is that you should change the fule pump if you upgrade any power. However I have been told by Faulks that the 2.5 can be adjusted a little to 0.8Bar and it will stay inside the cal of the ECU.

Bondy

[peterguk]

No one seems to have mentioned the fragile nature of the 5 speed gearboxes and non-LSD diffs. Remember the extra output puts a lot of extra stress on the drivetrain.

[joolski]

Personally I'd go for the exhaust upgrade, and intercooler upgrade before tinkering with boost.

(Fuel pump and wiring upgrade of course too)

That alone will release up to 20->30 bhp and make the power delivery less peaky.

I have a 2.5L, running .6 bar boost, kicking out 362bhp. And it's plenty quick mister !

--Jools

[mr.man]

peterguk said:

No one seems to have mentioned the fragile nature of the 5 speed gearboxes and non-LSD diffs. Remember the extra output puts a lot of extra stress on the drivetrain.

Possible input from factory please. How many five speed gearboxes and non-LSD diffs. are out there and how many have failed? Are potential customers avoiding these cars?