Limits of stock 1nzfe found once and for all. - Page 2 - Toyota Yaris Forums

CTScott · 04-30-2012, 09:41 PM

Quote:

Originally Posted by Blown_xa

I wouldn't tag a certain amount of boost to the limitation of stock rods.... It is power. Most likely the onset of power (torque) is the best measurement of limitation.

True, although it is the instantaneous force of the combustion explosion pushing against the crank before the rotation occurs that does the damage, as that peak force can be in excess of 6000 lbs. That force is the pressure within the cylinder at combustion multiplied by the area of the piston and by the sine of the angle of the rod at TDC (which is about 10 degrees). So, if that force peaks high enough either the bearing or rod will fail.

Blown_xa · 05-01-2012, 10:23 PM

Quote:

Originally Posted by CTScott

True, although it is the instantaneous force of the combustion explosion pushing against the crank before the rotation occurs that does the damage, as that peak force can be in excess of 6000 lbs. That force is the pressure within the cylinder at combustion multiplied by the area of the piston and by the sine of the angle of the rod at TDC (which is about 10 degrees). So, if that force peaks high enough either the bearing or rod will fail.

yea, detonation will kill rods at any power... I meant considering a bad tune not being the culprit .

Yoda · 04-30-2012, 09:42 PM

Quote:

Originally Posted by Blown_xa

I wouldn't tag a certain amount of boost to the limitation of stock rods.... It is power. Most likely the onset of power (torque) is the best measurement of limitation.

^^this

pimp my yaris · 04-30-2012, 10:04 PM

CP 9.5:1 pistons, Pauter rods and a new clutchmasters fx300 clutch ordered today from Micro Image. And now Im broke.

fnkngrv · 04-30-2012, 11:32 PM

Quote:

Originally Posted by pimp my yaris

And now Im broke.

Broke, but that first time that you drive it with the upgraded internals you know that you will have a shit eating grin on your face

Schizoprenia · 05-01-2012, 01:53 AM

Quote:

Originally Posted by pimp my yaris

CP 9.5:1 pistons, Pauter rods and a new clutchmasters fx300 clutch ordered today from Micro Image. And now Im broke.

wow your build progress just never ends does it,
i myself just pulled a stock zage kit and going just low boost but now you upgraded internals. your internal upgrading thread would be a very very educative as your kit installation build had been.

2 thumbs up for you...

cali yaris · 04-30-2012, 11:46 PM

ooh you went 9.5:1 -- NICE...

sorry about the broke part...

cali yaris · 04-30-2012, 11:47 PM

I don't think CTScott was doubting you, I think he wanted to see the chart.

Focus_Sh1ft · 05-01-2012, 03:00 AM

I've always wondered this and could probably use to read about a bit but... How is the engine going to perform with lower compression on stock management?

thefalls · 05-01-2012, 06:31 AM

Well lower compression will make a lazy engine off boost. I drive a very low compression engine 4efte with 7.8:1 compression[stock management and not tuned yet, at 0.5bar td05].A bit lazy offboost but when on boost it does fly :).

I would assume that 9.5:1 would be much better a drive.

pimp my yaris · 05-01-2012, 08:44 AM

I was going to stick with stock compression ratio on the advise from my friend who is helping me with the engine bulid. He has a 1000hp supra that runs on E85 alcohol. He is building a 2jz supra motor with stock compression and ridiculous boost levels "30psi+". Because E85 has less problems with detonation. He was trying to get me to run E85 in my car.

I decided to go lower compression and stick with gas as my engine wont be sleeved for crazy horsepower and I drive long distances where E85 may not be available.

cali yaris · 05-01-2012, 12:50 PM

^ Plus the work of changing out fuel lines and such, it's a pain. I opted not to go that way also. The compression you've chosen isn't a lot lower, it won't be very noticeable off boost, and you'll be able to run more boost. It will make tuning easier.

pimp my yaris · 05-01-2012, 08:23 PM

Life at the center of the Yariverse

Schizoprenia · 05-04-2012, 02:30 AM

Quote:

Originally Posted by pimp my yaris

Life at the center of the Yariverse

is that the picture of a used engine you got to replace the original broken one?

how much does it cost for a block like that, over there?

ROCKLAND TOYOTA · 05-04-2012, 08:46 AM

Quote:

Originally Posted by Schizoprenia

is that the picture of a used engine you got to replace the original broken one?

how much does it cost for a block like that, over there?

i got a 2008 motor out of a sedan for $800 with 38K. it was complete from head to pan.....

pimp my yaris · 05-01-2012, 08:25 PM

Oil change. THE HARD WAY.

pimp my yaris · 05-01-2012, 08:33 PM

Old motor boxed up. Head good, Bearing journals and crank good. I will save her for a rainy day and then mabe send her out to get sleeved at Golden Eagle. They can remove the part of cyl. 3 that cracked off and make her stronger then ever.

Oh, if I only had more money. Someday

Blown_xa · 05-01-2012, 10:25 PM

Quote:

Originally Posted by pimp my yaris

Old motor boxed up. Head good, Bearing journals and crank good. I will save her for a rainy day and then mabe send her out to get sleeved at Golden Eagle. They can remove the part of cyl. 3 that cracked off and make her stronger then ever.

Oh, if I only had more money. Someday

Those storage tubs are great, I use those a lot for motor teardowns!

04-30-2012, 11:46 PM	#7
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	ooh you went 9.5:1 -- NICE... sorry about the broke part... __________________ Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific.

04-30-2012, 11:47 PM	#8
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	I don't think CTScott was doubting you, I think he wanted to see the chart. __________________ Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific.

05-01-2012, 12:50 PM	#12
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	^ Plus the work of changing out fuel lines and such, it's a pain. I opted not to go that way also. The compression you've chosen isn't a lot lower, it won't be very noticeable off boost, and you'll be able to run more boost. It will make tuning easier. __________________ Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific.

04-30-2012, 10:04 PM	#4
pimp my yaris C'est la vie Drives: 2009 2 door hatchback Join Date: Aug 2009 Location: chicago Posts: 482	CP 9.5:1 pistons, Pauter rods and a new clutchmasters fx300 clutch ordered today from Micro Image. And now Im broke.

05-01-2012, 03:00 AM	#9
Focus_Sh1ft Drives: 08 Yaris Turbo; 06 tC Turbo Join Date: Jan 2010 Location: New Jersey Posts: 875	I've always wondered this and could probably use to read about a bit but... How is the engine going to perform with lower compression on stock management?

05-01-2012, 06:31 AM	#10
thefalls Drives: Axio GT Join Date: Apr 2012 Location: Sunny place Posts: 60	Well lower compression will make a lazy engine off boost. I drive a very low compression engine 4efte with 7.8:1 compression[stock management and not tuned yet, at 0.5bar td05].A bit lazy offboost but when on boost it does fly :). I would assume that 9.5:1 would be much better a drive.

05-01-2012, 08:44 AM	#11
pimp my yaris C'est la vie Drives: 2009 2 door hatchback Join Date: Aug 2009 Location: chicago Posts: 482	I was going to stick with stock compression ratio on the advise from my friend who is helping me with the engine bulid. He has a 1000hp supra that runs on E85 alcohol. He is building a 2jz supra motor with stock compression and ridiculous boost levels "30psi+". Because E85 has less problems with detonation. He was trying to get me to run E85 in my car. I decided to go lower compression and stick with gas as my engine wont be sleeved for crazy horsepower and I drive long distances where E85 may not be available.