Rod bending

[MWT5]

Obviously increasing power,torque and boost puts you at risk of bending the con rods my question is what is the single cause of bending rods is it too much low down power,torque or boost.alot of threads I've read with people asking the question, the answer seems to be I don't use WOT until 3500 rpm that's not really any help to me as I will be using WOT in first and second gear from a standing start and only use one gear for racing.

[smithy]

Obviously increasing power,torque and boost puts you at risk of bending the con rods my question is what is the single cause of bending rods is it too much low down power,torque or boost.alot of threads I've read with people asking the question, the answer seems to be I don't use WOT until 3500 rpm that's not really any help to me as I will be using WOT in first and second gear from a standing start and only use one gear for racing.

too much low down torque in the lower revs mate that why they say 3.5krpm

[MWT5]

too much low down torque in the lower revs mate that why they say 3.5krpm

Thank's smithy so the increased torque at low revs induced by increased boost, what would be the considered level of boost that is classed as "safe" with WOT at low revs.

[M-R-P]

Thank's smithy so the increased torque at low revs induced by increased boost, what would be the considered level of boost that is classed as "safe" with WOT at low revs.

From what I've seen, not much over standard - 1.2 - 1.5 bar (I think) Lots of custom maps limit boost until 3.5k to help save the rods.

[mitchyboy01]

Hi mate. Most aftermarket maps run 16psi is so I'd say this is safe although some people turn up the boost more via an MBC. They must either use self control or just take the risk (many have learned the hard way too)

[MWT5]

From what I've seen, not much over standard - 1.2 - 1.5 bar (I think) Lots of custom maps limit boost until 3.5k to help save the rods.

Cheers mate I'm trying to get a picture of what I can do modification wise and not end up with an engine tapping like someone sending morse code . At the moment it will be running a standard ecu with a mbc,standard turbo ,rip intercooler pipes and a 3inch turbo back exhaust oh and it will be in a spaceframed corsa weighing not much more than 650 kg.

[M-R-P]

Cheers mate I'm trying to get a picture of what I can do modification wise and not end up with an engine tapping like someone sending morse code . At the moment it will be running a standard ecu with a mbc,standard turbo ,rip intercooler pipes and a 3inch turbo back exhaust oh and it will be in a spaceframed corsa weighing not much more than 650 kg.

Hahahah! don't bother tuning it dude! 225 bhp will do it! lol (you effin nutter)

[MWT5]

Hi mate. Most aftermarket maps run 16psi is so I'd say this is safe although some people turn up the boost more via an MBC. They must either use self control or just take the risk (many have learned the hard way too)

Thanks mate from what vie read the standard ecu's cut at around 15-16 psi so this should keep me on the safe side for now until some forge rods are purchased and a re-map.
Another question is can you custom map a 850 ecu if so is this done through the obd port because I have to make a new loom for the car and if I need to wire this in.