1NZFE Safe REV limit - Page 2 - Toyota Yaris Forums

Parmas · 02-10-2010, 07:58 AM

Quote:

Originally Posted by cali yaris

The point remains the same. It's wherever the car stops making power. I can't imagine a build on the 1NZ that would require 8k or 9k rpms, so the question doesn't hold much relevance for me.

besides camshafts, you better have springs and some other head work done to access higher rpms safely.

Could you share your opinion what do you mean by better springs? or else what springs do you recommend

cali yaris · 02-10-2010, 11:47 AM

better springs = stronger or "high pressure" springs

I don't have a recommendation, I have stock springs and I'm happy with my results so far. I see no need right now for higher revs - the car doesn't make more power up there.

Parmas · 02-10-2010, 05:27 PM

Quote:

Originally Posted by cali yaris

better springs = stronger or "high pressure" springs

I don't have a recommendation, I have stock springs and I'm happy with my results so far. I see no need right now for higher revs - the car doesn't make more power up there.

In the microimage forums you mentioned in your thread (on last page 7) that art used stronger springs. Are you sure they are stock?

cali yaris · 02-10-2010, 05:52 PM

yep, they are stock. I was wrong. :(

thebarber · 02-10-2010, 07:02 PM

even richard holdener's setup peaked around 6000rpm

Bluevitz-rs · 02-10-2010, 09:12 PM

Quote:

Originally Posted by cali yaris

better springs = stronger or "high pressure" springs

I don't have a recommendation, I have stock springs and I'm happy with my results so far. I see no need right now for higher revs - the car doesn't make more power up there.

I can almost guarantee that you're starting to float the valves past 6000 RPM. With 20 psi of boost pushing them open, plus the high revs and the fact that they are pretty soft to start with.

Parmas · 02-11-2010, 05:41 AM

I can say that many owners who built a 1NZFE focused more on the bottom end (pistons and rods) which it's the right thing... but when planning beyond certain power and boost you can't leave a stock head pure and plain!

What about a Top End build? Is there a secret for the ultimate powerband of a 1NZFE?

cali yaris · 02-11-2010, 01:47 PM

it's no secret. port and polish, then work on valves, then work on cams. Cams are tricky with VVT-I though, in my experience.

rob323 · 02-11-2010, 07:21 PM

Quote:

Originally Posted by Parmas

What about a Top End build? Is there a secret for the ultimate powerband of a 1NZFE?

Basically, the camshaft that you run depends where the power band will be in the rev range.
Ideally, you choose your camshaft based on the intended purpose of the vehicle and where abouts you want the power band to be in the rev range, then select valve springs (and sometimes valves) to suit, and then size your turbo, intake, exhaust and intercooling system accordingly.

In theory, the design of the 1NZFE does not suit really high revs due to the bore to stroke ratio.

If using stock cams, then the factory redline (or slightly higher if it helps with your gear change points) will suffice.

02-10-2010, 11:47 AM	#20
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	better springs = stronger or "high pressure" springs I don't have a recommendation, I have stock springs and I'm happy with my results so far. I see no need right now for higher revs - the car doesn't make more power up there. __________________ 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.

02-10-2010, 05:52 PM	#22
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	yep, they are stock. I was wrong. :( __________________ 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.

02-10-2010, 07:02 PM	#23
thebarber daily driver View User's Garage Drives: the #wrecho Join Date: Jun 2006 Location: Grand Rapids, MI Posts: 5,877	even richard holdener's setup peaked around 6000rpm __________________

02-11-2010, 01:47 PM	#26
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	it's no secret. port and polish, then work on valves, then work on cams. Cams are tricky with VVT-I though, in my experience. __________________ 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.

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Parmas Drives: Vitz RS Turbo Join Date: Nov 2008 Location: ML Posts: 576	I can say that many owners who built a 1NZFE focused more on the bottom end (pistons and rods) which it's the right thing... but when planning beyond certain power and boost you can't leave a stock head pure and plain! What about a Top End build? Is there a secret for the ultimate powerband of a 1NZFE?