Turbosleeper Posted June 4, 2010 Report Share Posted June 4, 2010 Ok so Im just wanting to know what causes people to bend rods on the LPT block and what can i do to prevent it from happening. Im wanting to run a 17 psi rica tune on my car but dont want to bend rods. Mine is a 97 with motronic 4.4 and I believe it to have oil squirters under the pistons if that makes a difference. Thanks guys Link to comment Share on other sites More sharing options...
flyfishing3 Posted June 4, 2010 Report Share Posted June 4, 2010 don't install a 19t, i can tell you that for sure. Link to comment Share on other sites More sharing options...
Burn-E Posted June 4, 2010 Report Share Posted June 4, 2010 Search, there was a previous thread on rod bending conditions. Largely focused on the T5 engine + turbo but worth looking over. This thread on LPT internals and success / failure is relevant also. Edit, here's the thread on rod bending conditions. Link to comment Share on other sites More sharing options...
magicaljake Posted June 4, 2010 Report Share Posted June 4, 2010 it is my understanding that the LPT and HPT engines share the same rods.... and with higher compression and displacement i would assume it would be much easier to create the torque needed to bend the same rod... people get sketched out running a 19t on the 2.3 hpt engine..... but... 550 (IIRC) is running a k24 on a lpt Link to comment Share on other sites More sharing options...
Fudge_Brownie Posted June 4, 2010 Report Share Posted June 4, 2010 You'll bend rods in an LPT the same way(s) you bend them in an HPT. It's just a question of how much; it's quantitative. Link to comment Share on other sites More sharing options...
Turbosleeper Posted June 4, 2010 Author Report Share Posted June 4, 2010 Thanks for the inputs guys, I will check that link now. What else do I need to worry about with an LPT. i already installed samcos and a 16t. Should I be more worried about breaking my angle gear before I bend rods? Would aquamist and a fmic help at all? Link to comment Share on other sites More sharing options...
GP850T Posted June 4, 2010 Report Share Posted June 4, 2010 Aquamist FMIC, unless you have the tune to go for it, it will not really help Yes theres a good chance your angle gear will explode its only a matter of time High boost low RPM = bent rods dont ever forget that Link to comment Share on other sites More sharing options...
greekone Posted June 4, 2010 Report Share Posted June 4, 2010 High boost low RPM = bent rods dont ever forget that No, detonation bends rods. Link to comment Share on other sites More sharing options...
faultywarrior Posted June 4, 2010 Report Share Posted June 4, 2010 No, detonation bends rods. that too, but high intake pressure at low RPM's pwn rods just as fast. Pre-det. is also a fast track to pwn'd rods. Link to comment Share on other sites More sharing options...
ozzimark Posted June 4, 2010 Report Share Posted June 4, 2010 that too, but high intake pressure at low RPM's pwn rods just as fast. Pre-det. is also a fast track to pwn'd rods. No. It's detonation, or ignition being advanced too far with enough boost. I've hit 15psi before 2.5k when I was running an MBC in really cold weather, and it was fine. It just happens that high boost and low rpm is where detonation seems to be the most problematic on our cars. Especially with a turbo like the 19T, which just builds boost so rapidly, the ECU seems to have trouble keeping up. Link to comment Share on other sites More sharing options...
faultywarrior Posted June 4, 2010 Report Share Posted June 4, 2010 No. It's detonation, or ignition being advanced too far with enough boost. I've hit 15psi before 2.5k when I was running an MBC in really cold weather, and it was fine. It just happens that high boost and low rpm is where detonation seems to be the most problematic on our cars. Especially with a turbo like the 19T, which just builds boost so rapidly, the ECU seems to have trouble keeping up. True. Though I still think pre-detonation is a cause here too. A meth kit will help a lot, but it's not going to do 100% of the fix. A good CAI is a plus as well. Link to comment Share on other sites More sharing options...
HtownTurboBrick Posted June 4, 2010 Report Share Posted June 4, 2010 We'll be able to put this issue to rest in a few weeks stay tuned folks my 00 R motor w/ bent rods is coming out and a new experiment is going in :D Link to comment Share on other sites More sharing options...
GP850T Posted June 4, 2010 Report Share Posted June 4, 2010 True. Though I still think pre-detonation is a cause here too. A meth kit will help a lot, but it's not going to do 100% of the fix. A good CAI is a plus as well. I was gonna type something but nvm i decided not to Link to comment Share on other sites More sharing options...
mrbrightside2009 Posted June 5, 2010 Report Share Posted June 5, 2010 so since i have a lpt too, j/w, what is a safe rpm to start boosting and hit full boost say like my car 13 psi, right now i start boosting at 2500rpm and hit full boost at about 3600-3800. also what does detonation sound like is it like a crackling sound, because i swear ive heard it before when i had a misfire under boost? Link to comment Share on other sites More sharing options...
ozzimark Posted June 5, 2010 Report Share Posted June 5, 2010 Jim, pre-detonation? also what does detonation sound like is it like a crackling sound, because i swear ive heard it before when i had a misfire under boost? Yes, that would be detonation. Also, you can run a bunch of boost down low if you have a tune set up for it, and a system that can keep boost spikes under control. Link to comment Share on other sites More sharing options...
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