1nzfe valve and valve springs

[vitz rs]

Hi, I would like to check if anyone knows
Any online sales of ferrea valve and valve
Springs for 1nzfe.

Thanks

[fnkngrv]

Good luck is all I can say. The only 2 vendors I am aware of closed up shop. You could still try Cali_yaris. Not sure if he has or can get them. I have the BC valve spring kit is it works fine. Unless you are going to be producing over 350whp and hage a turbo that doesn't deliver power until 5k+ and still has a power band that still carries over 8300k there really is no reason to dump over a grand in the ferrea kit.

[tsu]

Not sure whether someone has asked for this matter. I have a Yaris NCP91 (Gen II, 5-door hatchback, 1.5 litre 1NZ-FE engine). Currently, I'm using stock valve springs and stock camshaft in the engine, and now the springs seem to be floating around 7000 rpm.
My friend told me that 1ZZ-FE valve springs can be a good subtitute for the stock valve springs. He said that the 1ZZ-FE valve springs are stiffer almost twice of the stock valve springs have.
I know that aftermarket valve springs would be a better choice, but since I'm still using stock camshaft, I'm afraid that aftermarket valve springs would be too harsh for the stock camshaft (the camshaft and its lobes cannot withstand the pressure from the aftermarket valve springs). Has anyone ever installed 1ZZ-FE valve springs into 1NZ-FE engine?. Any issues?.

[alias06]

Originally Posted by tsu

Not sure whether someone has asked for this matter. I have a Yaris NCP91 (Gen II, 5-door hatchback, 1.5 litre 1NZ-FE engine). Currently, I'm using stock valve springs and stock camshaft in the engine, and now the springs seem to be floating around 7000 rpm.
My friend told me that 1ZZ-FE valve springs can be a good subtitute for the stock valve springs. He said that the 1ZZ-FE valve springs are stiffer almost twice of the stock valve springs have.
I know that aftermarket valve springs would be a better choice, but since I'm still using stock camshaft, I'm afraid that aftermarket valve springs would be too harsh for the stock camshaft (the camshaft and its lobes cannot withstand the pressure from the aftermarket valve springs). Has anyone ever installed 1ZZ-FE valve springs into 1NZ-FE engine?. Any issues?.

Stock rev-limit is around 6500 rpms...so how are you up at 7k? For your question I don't think anyone has swapped out 1zz springs for 1nz's. If you had one of each spring, you could do a bench test and get your answer that way.

[xnamerxx]

Stock valve springs are good for at least 7800 rpms, 2az spring will bind I haven't tried 1zz springs but I imagine its probably the same. BC valve springs are too stiff for VVT. Stock cam is way out of steam before 7k rpm, I've got plenty of dyno sheets to prove it.

IIRC stock springs are 25lbs installed height and 50 lbs at .4" Brian Crower springs are 1.280 : 48-50 LBS .400” lift 105 lbs

[tsu]

Originally Posted by alias06

Stock rev-limit is around 6500 rpms...so how are you up at 7k? For your question I don't think anyone has swapped out 1zz springs for 1nz's. If you had one of each spring, you could do a bench test and get your answer that way.

Thanks for your reply, I have installed a Unichip in my car which has a feature to "open" the rev-limiter.

Originally Posted by xnamerxx

Stock valve springs are good for at least 7800 rpms, 2az spring will bind I haven't tried 1zz springs but I imagine its probably the same. BC valve springs are too stiff for VVT. Stock cam is way out of steam before 7k rpm, I've got plenty of dyno sheets to prove it.

IIRC stock springs are 25lbs installed height and 50 lbs at .4" Brian Crower springs are 1.280 : 48-50 LBS .400” lift 105 lbs

Really up to 7800 rpms??. Actually, the cylinder head has been ported-and-polished and milled. During the dyno test, my mechanic assumes that my stock spring valves are floating at high revs because the horsepower falls steeply after 6000 rpms and the peak horsepower occurs at around 5600 rpms. He added that beyond 7000 rpms, the acceleration feels rough and sluggish (the symptom is similar to incorrect air-fuel ratio; too rich mixture. But it is not because of AFR). To be honest, I'm not sure whether it is caused by valve springs or not. However, me and my mechanic have check all the other parts and variables, and they're on the right track.

Since my cylinder head has been ported-and-polished and milled, will it limit the work of stock valve springs (valve springs float sooner)?. Or maybe, is it because my stock camshaft that cannot provide a longer "breathe" beyond 7000 rpms?. It is quite hard anyway to find aftermarket parts for Yaris in Indonesia these days, especially engine internal parts .