850 t5 how much is too much boost

[mrt5]

Hi guys
I've just got my self a 94 850 t5, I fitted a boost gauge and boost controller just wondering how far I can go and it still be safe?

[WOODY T5]

Ask frankie he knows

[merc85]

Dont boost below 3.5k at least, im runing around 18-19 psi but sometimes when its cooler its over 20! doh, like i said be careful you don't boost to much at to lower rpm.

[Nealevo]

Upto 21 is fine but don't floor it below 3500rpm

[graemewelch]

id stick to 1bar and keep it useable right across the rev range

[stribo]

Ask frankie he knows
His is always too much.;)

[T5frankie]

all this dont boost till over 3500 is rubbish, the rods are weak and can go anytime, i was only running 18 psi or so and my conrods bent, if you want my opinion dont uise an mbc on an unforged engine its not if but when you will §§§§ it, just map it

[p fandango]

i ran an MBC@20.8psi for years & floored it anytime i wanted & never had an issue, yet i know someone who bent a rod with a 15g & map. There are no set rules

[WOODY T5]

all this dont boost till over 3500 is rubbish, the rods are weak and can go anytime, i was only running 18 psi or so and my conrods bent, if you want my opinion dont uise an mbc on an unforged engine its not if but when you will §§§§ it, just map itthink your right on that mate my car boosts 1.3/4 from 1500 rpm:)

[T5frankie]

think your right on that mate my car boostm1.3/4 from 1500 rpm:)

your the exception...bloody git lol

[Vmaxx]

Over here we try to keep it less than 10psi before 3000rpm. My ecu tune brings 10plus at 3600-3700rpm then 16psi over 4000.

[AndysR]

It's generally the torque generated by the boost and the way the boost is introduced that kills the rods not the boost level itself, although they're closely linked...
Standard off the shelf maps run around 1.1-1.2 bar of boost, anymore and your asking for trouble, mine was professionally mapped, ran 1.4 bar over 3,500 rpm in the last 2 gears but 1.1 in 1st and 2nd for well over a year with no probs at all, I then altered the intake pipe work between the maf and turbo and bent a rod the very next day....

[theflyingbrick]

and if you haven't had it mapped you wont be able to go to high anyway!! I think its something like 14.9psi before you hit the dreaded boost cut? so best off saving your pennys and get it mapped mate,HLM do it for 150 of your hard earned

[stribo]

I've seen 1.1 bar without boost cut, don't want to go mucher higher though.

[Madbloke100]

You can never have too much boost. Used to have fiat coupe got boost up to 2 bar before she blew

[Saaamon]

Mine goes to just before the end of the white with an Mbc, don't normally let full boost come on until about 2500 3000.

[merc85]

When (NEW) volvo rated the Conrods to 24psi. but as its been said, its the Torque at low rpm that kills them, Im and have bin runing 20psi. but dont floor it till after 3,500

[Biff]

I'm running a bar & have not had the boost cut off come on.

[jamesy12345]

S70 auto, 1.2 barg, worried about my rods :D

[Jamest5r]

26psi and no problems :)

[AndysR]

26psi and no problems :)

Don't you have rods though James?

[jamesy12345]

26psi and no problems :)

More than in my tyres!!

[Jamest5r]

Don't you have rods though James?


Of course im not daft :)

[AndysR]

Of course im not daft :)

I thought so lol, Whilst the OP doesn't state directly I'm fairly confident he/she wants to know the safe boosting limits of a standard engine.. Lol

[T5frankie]

I'm running a bar & have not had the boost cut off come on.

no such thing as boost cut lol, especially on the x70's

[hybriduno]

im running 17 psi on stock engine. but to be fair ive not done a lot with the car but my god it pulls F00kin hard lol