hp vs psi - Toyota Yaris Forums

Paris vvt-i · 11-13-2010, 12:14 PM

Well what do you think guys? I think that the right thing is talking about ''maximum horsepower'' for an engine component and not ''maximum psi''. I think that talking about an ammount of psi is pointless unless you are talking about a specific turbo.
what do you think?

turboecho2005 · 11-13-2010, 12:25 PM

Yes you're right about the horsepower vs psi is based on the turbo size (among other factors). But the general rule on average is 1psi = 10hp

Paris vvt-i · 11-13-2010, 12:32 PM

Yes

and i think that if someone is making 240hp with a T25 (20psi) it is the same thing for the engine if you had 240hp with a t28 (12psi). You have the same peak cylinder pressure during combustion if you make the same power. I think it is horsepower that breaks rods or cracks sleeves right?

turboecho2005 · 11-13-2010, 12:37 PM

No. Horsepower doesn't break rods or pistons. A bad tune or a hickup in a tune giving a spike in the air fuel causing it to run lean will blow your motor.

Paris vvt-i · 11-13-2010, 12:45 PM

I do not completely agree with this. it is not only a good tune. the components of a specific engine have a limit in hp i think?

turboecho2005 · 11-13-2010, 01:09 PM

Limits... to some degree yes. I wouldn't run 20psi on stock . Longevity is more of a factor. It really depends on your hp goal.

turboecho2005 · 11-13-2010, 01:16 PM

Just to give you an idea. I am running 8.5psi with 11.1:1 compression on a hybrid gt28r turbo making over 250hp. Stock the motor makes 160hp. I could run 10psi but the egt is getting up there for continual use.

11-13-2010, 12:14 PM	#1
Paris vvt-i Drives: Yaris ts 1.5 Join Date: Sep 2009 Location: Athens Posts: 29	hp vs psi Well what do you think guys? I think that the right thing is talking about ''maximum horsepower'' for an engine component and not ''maximum psi''. I think that talking about an ammount of psi is pointless unless you are talking about a specific turbo. what do you think?

11-13-2010, 12:25 PM	#2
turboecho2005 Drives: 2005 Toyota Echo Join Date: Oct 2008 Location: Ottawa, Ontario Posts: 177	Yes you're right about the horsepower vs psi is based on the turbo size (among other factors). But the general rule on average is 1psi = 10hp __________________ Project Slowtop - Twin Engine 4AGE Blacktop Vitz - Twin Turbo - 503hp 1987 Nissan Maxima - 40,000 original miles - Slammed 1991 Isuzu Impulse RS AWD Turbo - approx 250hp - Winter Beater 1989 Isuzu Imark RS - Mint Condition - 0 rust - 100% factory :) - Summer Cruiser - 100% restored 1986 VW Jetta Wolfsburg - 120,000km - Mint condition. TDI swap in progress

11-13-2010, 12:32 PM	#3
Paris vvt-i Drives: Yaris ts 1.5 Join Date: Sep 2009 Location: Athens Posts: 29	Yesand i think that if someone is making 240hp with a T25 (20psi) it is the same thing for the engine if you had 240hp with a t28 (12psi). You have the same peak cylinder pressure during combustion if you make the same power. I think it is horsepower that breaks rods or cracks sleeves right?

11-13-2010, 12:37 PM	#4
turboecho2005 Drives: 2005 Toyota Echo Join Date: Oct 2008 Location: Ottawa, Ontario Posts: 177	No. Horsepower doesn't break rods or pistons. A bad tune or a hickup in a tune giving a spike in the air fuel causing it to run lean will blow your motor. __________________ Project Slowtop - Twin Engine 4AGE Blacktop Vitz - Twin Turbo - 503hp 1987 Nissan Maxima - 40,000 original miles - Slammed 1991 Isuzu Impulse RS AWD Turbo - approx 250hp - Winter Beater 1989 Isuzu Imark RS - Mint Condition - 0 rust - 100% factory :) - Summer Cruiser - 100% restored 1986 VW Jetta Wolfsburg - 120,000km - Mint condition. TDI swap in progress

11-13-2010, 01:09 PM	#6
turboecho2005 Drives: 2005 Toyota Echo Join Date: Oct 2008 Location: Ottawa, Ontario Posts: 177	Limits... to some degree yes. I wouldn't run 20psi on stock . Longevity is more of a factor. It really depends on your hp goal. __________________ Project Slowtop - Twin Engine 4AGE Blacktop Vitz - Twin Turbo - 503hp 1987 Nissan Maxima - 40,000 original miles - Slammed 1991 Isuzu Impulse RS AWD Turbo - approx 250hp - Winter Beater 1989 Isuzu Imark RS - Mint Condition - 0 rust - 100% factory :) - Summer Cruiser - 100% restored 1986 VW Jetta Wolfsburg - 120,000km - Mint condition. TDI swap in progress

11-13-2010, 12:45 PM	#5
Paris vvt-i Drives: Yaris ts 1.5 Join Date: Sep 2009 Location: Athens Posts: 29	I do not completely agree with this. it is not only a good tune. the components of a specific engine have a limit in hp i think?

11-13-2010, 01:16 PM	#7
turboecho2005 Drives: 2005 Toyota Echo Join Date: Oct 2008 Location: Ottawa, Ontario Posts: 177	Just to give you an idea. I am running 8.5psi with 11.1:1 compression on a hybrid gt28r turbo making over 250hp. Stock the motor makes 160hp. I could run 10psi but the egt is getting up there for continual use. __________________ Project Slowtop - Twin Engine 4AGE Blacktop Vitz - Twin Turbo - 503hp 1987 Nissan Maxima - 40,000 original miles - Slammed 1991 Isuzu Impulse RS AWD Turbo - approx 250hp - Winter Beater 1989 Isuzu Imark RS - Mint Condition - 0 rust - 100% factory :) - Summer Cruiser - 100% restored 1986 VW Jetta Wolfsburg - 120,000km - Mint condition. TDI swap in progress

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
diff. tire size should mean put diff. psi right?	ezhacker1	Fuel Economy Forum	10	01-14-2010 06:48 AM
Daily Driven Yaris @ 10 PSI	ChinoCharles	Forced Induction Forum	36	12-22-2009 11:29 PM
Should I lower the PSI during the Winter?	paulyd0021	Wheels, Tires and Suspension Forum sponsored by The Tire Rack	6	12-10-2009 10:12 PM
Should I lower the PSI during the Winter?	paulyd0021	General Yaris / Vitz Discussion	5	12-10-2009 06:49 PM
screw more psi in the tires.	thebarber	Fuel Economy Forum	43	05-04-2009 04:46 PM