28 replies to this topic

[tchnprgrmr]

i know everybody says the internals for LPT engines(pistons in particular i believe) are only good to 15psi.

I realize that bending rods, pistons can happen regardless, but lets assume that the boost doesn't onset too early and talk about the internal strength.

Why are LPT internals weaker than HPT internals? the only difference(according to vadis) is that the LPT bore is 2 mm more than the HPT. Comparison pictures, or more information than "my brother's cousin told me" would be nice.

[TRACStar]

The problem is the higher compression ratio. Higher ratio = higher cyl pressure.

Rods are the same as the HPT and pistons are probably just as strong as the stock HPT pistons.

[tchnprgrmr]

ok, that makes sense.

so the conditions for bending rods would be close to the same as a HPT at a higher psi?

so at the same psi a LPT should run a bit richer than a HPT to decrease the risk of bending a rod/piston? I realize the risk is still present I just want to decrease the probability

[mrbrightside2009]

im sure most of it has to do with maintaining the car properly, good stage 0, also some people just go crazy with their boost, also not beating on it every second, common sense. im just wondering is there any proof with people on here with lpt's that have bent rods and how much boost they were running at the time and the main cause, ie. other malfunctions things like that?

[Fudge_Brownie]

MOAR OCTANE!

[Jaxx]

MOAR OCTANE!

better tune.

I find it lol worthy that people are afraid to do hard throttle at low RPM. The great thing about having a turbo is having torque down low. What's the point if you can't use it.

[550]

I run 19 lbs from a K24 on my LPT...

[mrbrightside2009]

I run 19 lbs from a K24 on my LPT...

with a tune obviously and stock internals?

[johnloves850's]

I run 19 lbs from a K24 on my LPT...

That thing must be a torque monster

[gmsgltr]

lol John your "INterests" are funny.

better tune.

I find it lol worthy that people are afraid to do hard throttle at low RPM. The great thing about having a turbo is having torque down low. What's the point if you can't use it.

what do you mean? if the tune is better you can have lower rpm boost? i actually am one of those people, i ease into throttle before fully stepping on it for that reason haha. i have an ipd tune, but for some reason dont trust that it is one. bought it off here used and it hold 14/15psi but eh.

[550]

with a tune obviously and stock internals?

Stock internals, crappy tune. haha With water injection. Afrs= mid 13's .. haha

[matt b]

lol John your "INterests" are funny.



what do you mean? if the tune is better you can have lower rpm boost? i actually am one of those people, i ease into throttle before fully stepping on it for that reason haha. i have an ipd tune, but for some reason dont trust that it is one. bought it off here used and it hold 14/15psi but eh.

Yeah, it bothers me that IPD tuned ECU can't be identified I had the same issue with mine until I could verify its origin.

Stock internals, crappy tune. haha With water injection. Afrs= mid 13's .. haha

At 15 psi, my AFR's are consistently in the 11's or even 10's. RICA tune and 15 psi max...

[GltGreco]

im at 12psi with a t5 ecu, im hoping to go to/above 15psi when i get my new turbo, and this threads making me nervous and sad...

[550]

Shouldn't make you nervous... my RICA base map same turbo same PSI ran in the 10 - 11's.

If I can run 19 LBS at mid 13's... well you can infer the rest.

[mrbrightside2009]

im at 12psi with a t5 ecu, im hoping to go to/above 15psi when i get my new turbo, and this threads making me nervous and sad...

15 psi with a tune, i wouldn't with a mbc, im sure you could but i have mine set at 12, 13 psi right now.

[rbodor3]

19psi here too. stock internals.

[GltGreco]

yeah but idk im at 12 now at its not a problem at all (also 12 out of a 13g so its lame haha) but who knows f good cheap tunes for us glt guys? I wanna run over 15psi when i get my new turbo and exhaust and ishh

[mrbrightside2009]

yeah but idk im at 12 now at its not a problem at all (also 12 out of a 13g so its lame haha) but who knows f good cheap tunes for us glt guys? I wanna run over 15psi when i get my new turbo and exhaust and ishh

yea at 12 psi on a 13g probably not doing much lol, wait til you get a 16t a lot more fun, even with just a mbc, til i can afford a tune lol.

[Turbosleeper]

yea at 12 psi on a 13g probably not doing much lol, wait til you get a 16t a lot more fun, even with just a mbc, til i can afford a tune lol.

agreed, I just installed my 16t the other day with a mbc( probably around 10-12psi) havent installed a gauge yet but I dont hit fuel cut off so Im good. But what a difference over the 13g.

[Big Will]

Yea I run 16 PSI on my 15G and white injectors with the Wothrline tune made for my car. Anything more than that should just be hot air though but it's a freshly rebuilt 15G (last 10K miles) with a 360 degree thrust bearing so it's in good shape. I'm impressed by those of you running 19Ts on an LPT with stock internals. I plan on going the 19T route as well, but not until I put in better rods and do all new seals on the engine.

Edited by Big Will, 27 May 2010 - 03:07 PM.