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

pimp my yaris · 04-29-2012, 07:44 PM

This is my motor with bent rod and cracked block and piston sleeve. This was at 12psi and 197whp dynoed only 2 days before major engine noise on a mustang dyno. Now on to the build of my junk jard motor.

JumpmanYaris · 04-29-2012, 08:19 PM

Ouch

Yoda · 04-29-2012, 10:58 PM

Told ya the rods where the first to go lol. Thanks to for getting that Dyno. Be sure to add your info to my durability thread when u get a chance. You pushed it further than i did by 2 psi. At 10psi after awhile I burnt up my valves. How are yours?

Focus_Sh1ft · 04-30-2012, 01:55 AM

Wow. I'll keep the innuendos to myself.

Looking forward to watching your rebuild. Thanks again - this is a vital piece of information for those of us with boost.

eTiMaGo · 04-30-2012, 02:17 AM

hmmm Gonzo rods :D Sorry to hear that dude, but now we have a better idea of the limitations of the stock hardware :)

fnkngrv · 04-30-2012, 07:14 AM

It has become obvious that 8psi is the max safe boost level with considerations of even staying at 6 for those folks that are looking for longevity and reliability. Personally in hindsight with my build I wouldn't tell anyone to use an internal wastegate unless they installed a premium turbo. I would also sttrongly recommend performing a compression test before and then again after installation.

fnkngrv · 04-30-2012, 07:17 AM

I wish that I could reinforce your results, but since I had spiked to over 25psi the couple times my situation isn't a good marker. I will enjoy tearing my motor down especially since my rods shattered.

CTScott · 04-30-2012, 07:54 AM

Quote:

Originally Posted by pimp my yaris

This is my motor with bent rod and cracked block and piston sleeve. This was at 12psi and 197whp dynoed only 2 days before major engine noise on a mustang dyno. Now on to the build of my junk jard motor.

Did you post the dyno chart from your mustang run?

johnny_vitz · 04-30-2012, 12:04 PM

I'm still wondering if there is a difference in the bottom end of the echo/xb compared to the yaris. Blownxa said he went through a few engines just above 150whp in his xa (with a good/safe tune) as well as a couple other xb guys on clubxb.com

Sorry to hear about your engine pimp. How much boost will you be running once it is built?

cali yaris · 04-30-2012, 12:38 PM

^ They seem identical to me. I've reviewed them side by side. Don't know about part numbers.

1.5 · 04-30-2012, 12:47 PM

thats some high boost for these little guys. Now to the build. Good Luck!

CTScott · 04-30-2012, 12:59 PM

Quote:

Originally Posted by cali yaris

^ They seem identical to me. I've reviewed them side by side. Don't know about part numbers.

Looking at the EPC, the Echo, xA, xB, and Yaris all share the same part numbers for pistons, rods, and crankshaft. The Prius uses the same rods, but different pistons and crankshaft.

fnkngrv · 04-30-2012, 01:32 PM

The rods are useless unfortunately. I totally underatand why they are what they are, but it still is a fact.

CTScott · 04-30-2012, 01:40 PM

Quote:

Originally Posted by fnkngrv

The rods are useless unfortunately. I totally underatand why they are what they are, but it still is a fact.

It would be very interesting to have one of the stock rods analyzed for its real rating. From what I have been reading in some automotive engineering journals, stock rods are typically designed to handle between 25% and 40% more force than stock, which in our case would mean about 150 HP max (if ours are really 40% over engineered).

If we could find out the compression PSI limit of the stock rods, it would be easy enough to run the math to determine the theoretical boost limit.

eTiMaGo · 04-30-2012, 01:50 PM

Crashy would cowering in fear if she could read that post :D

Blown_xa · 04-30-2012, 07:38 PM

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.

CTScott · 04-30-2012, 08:41 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.

Yoda · 04-30-2012, 08:42 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

04-30-2012, 02:17 AM	#5
eTiMaGo vroom vroom View User's Garage Drives: lil red 5-door Join Date: Sep 2006 Location: Bangkok, Thailand Posts: 7,744	hmmm Gonzo rods :D Sorry to hear that dude, but now we have a better idea of the limitations of the stock hardware :) __________________ The price of freedom of religion, or of speech, or of the press, is that we must put up with a good deal of rubbish. - Robert Jackson Bye bye 1NZ...

04-30-2012, 07:14 AM	#6
fnkngrv Mr. 155 and climbing View User's Garage Drives: Seriously Modded 07 Sedan Join Date: Jun 2006 Location: In The Hotbox Posts: 4,742	It has become obvious that 8psi is the max safe boost level with considerations of even staying at 6 for those folks that are looking for longevity and reliability. Personally in hindsight with my build I wouldn't tell anyone to use an internal wastegate unless they installed a premium turbo. I would also sttrongly recommend performing a compression test before and then again after installation. __________________ Team Tiamat Racing on Facebook Youtube Channel: Team Tiamat Racing *Class record holder in Land Speed @ 154.5mph for 1.5 mile and 145.5mph in the mile in the F (2.016 to 3.014 L), G (1.524 to 2.015 L), and H (1.016 to 1.523 L) classes.*

04-30-2012, 07:17 AM	#7
fnkngrv Mr. 155 and climbing View User's Garage Drives: Seriously Modded 07 Sedan Join Date: Jun 2006 Location: In The Hotbox Posts: 4,742	I wish that I could reinforce your results, but since I had spiked to over 25psi the couple times my situation isn't a good marker. I will enjoy tearing my motor down especially since my rods shattered. __________________ Team Tiamat Racing on Facebook Youtube Channel: Team Tiamat Racing *Class record holder in Land Speed @ 154.5mph for 1.5 mile and 145.5mph in the mile in the F (2.016 to 3.014 L), G (1.524 to 2.015 L), and H (1.016 to 1.523 L) classes.*

04-30-2012, 12:04 PM	#9
johnny_vitz Drives: 2005 Toyota Echo Join Date: Sep 2010 Location: Hamilton, Canada Posts: 259	I'm still wondering if there is a difference in the bottom end of the echo/xb compared to the yaris. Blownxa said he went through a few engines just above 150whp in his xa (with a good/safe tune) as well as a couple other xb guys on clubxb.com Sorry to hear about your engine pimp. How much boost will you be running once it is built? __________________ 05' Echo Hatch - Greddy Supercharger - rear disc

04-30-2012, 12:38 PM	#10
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	^ They seem identical to me. I've reviewed them side by side. Don't know about part numbers. __________________ 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.

04-29-2012, 10:58 PM	#3
Yoda Drives: 2008 Black Sedan Join Date: Oct 2008 Location: FL Posts: 966	Told ya the rods where the first to go lol. Thanks to for getting that Dyno. Be sure to add your info to my durability thread when u get a chance. You pushed it further than i did by 2 psi. At 10psi after awhile I burnt up my valves. How are yours?

04-30-2012, 01:55 AM	#4
Focus_Sh1ft Drives: 08 Yaris Turbo; 06 tC Turbo Join Date: Jan 2010 Location: New Jersey Posts: 875	Wow. I'll keep the innuendos to myself. Looking forward to watching your rebuild. Thanks again - this is a vital piece of information for those of us with boost.

04-30-2012, 12:47 PM	#11
1.5 Form>Function Drives: 07 Flint Sedan Join Date: Dec 2009 Location: Tampa Posts: 4,018	thats some high boost for these little guys. Now to the build. Good Luck! __________________ Instagram: @southernstreets_phil Facebook.com/southernstreetsempire

04-30-2012, 01:32 PM	#13
fnkngrv Mr. 155 and climbing View User's Garage Drives: Seriously Modded 07 Sedan Join Date: Jun 2006 Location: In The Hotbox Posts: 4,742	The rods are useless unfortunately. I totally underatand why they are what they are, but it still is a fact. __________________ Team Tiamat Racing on Facebook Youtube Channel: Team Tiamat Racing *Class record holder in Land Speed @ 154.5mph for 1.5 mile and 145.5mph in the mile in the F (2.016 to 3.014 L), G (1.524 to 2.015 L), and H (1.016 to 1.523 L) classes.*

04-30-2012, 01:50 PM	#15
eTiMaGo vroom vroom View User's Garage Drives: lil red 5-door Join Date: Sep 2006 Location: Bangkok, Thailand Posts: 7,744	Crashy would cowering in fear if she could read that post :D __________________ The price of freedom of religion, or of speech, or of the press, is that we must put up with a good deal of rubbish. - Robert Jackson Bye bye 1NZ...

04-30-2012, 07:38 PM	#16
Blown_xa Drives: Scion xA Join Date: Oct 2009 Location: Virginia Posts: 449	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. __________________ Ptuning.com