Torque Peak

[daniel2002p]

Just looking to see if someone can clarify something for me....

I have found two different infos on torque peak for the 05 rolla s 1.8 VVT-i

First I found by googling that it is 2880 RPM

Then I went to http://www.edmunds.com/new/2006/toyo...065/specs.html and according to them the torque peak is 4200 RPM.... Does anyone know the real spec on this...

D

[Flashmn]

4200 sounds closer to the truth.

[Chris Corolla S]

4200 RPM is correct

[freakinbox]

maybe it's both
maybe one is going by the use of vvt-i that would technically give it to different torque peaks...

[ToyotaMan1281]

Well I know it has good torque between 2-4K rpm, good HP 4-6K rpm (gotta love vvti) But as far as I know the peak torque is around 4500 and max hp around 5500

[Flashmn]

well a car cant have two peak torque points. and no a 1.8 liter engine WONT have its peak torque at V8 rpm readings.

[freakinbox]

well it technically can. If they go by the torque peak for the 2 sets of lobes. the change in timing would change the torque peak... thats what makes vvt and vvt-i so great

[Flashmn]

Umm no, because the torque curve cant be like that.
Thats not the main idea of vvt to begin with. its there to produce a much broader torque curve, not to give peak torque down low and again at high rpm. its impossible.

[Guido]

If Toyota could make cam #2 peak at the same place as #1, yet with a flatter/broader curve, then they wouldn't need cam #1 because it wouldn't offer any advantages. If it peaks at a different point than cam #2... then you have two peaks on the same engine.

[Flashmn]

what cam 1 and cam 2? There is no cam one and cam two, theres only one cam. Toyotas vvt doesnt work like Vtec where there's another lobe, but even then theres only one peak torque point in the engine and thats in the Vtec lobe.

[Flashmn]

Since you guys are a bit out in the woods, heres a pic to clear it, its from a 2ZZ-GE.

Notice the torque band? The peak torque is where the highest reading takes place, nowhere else, now you cant have peak torque down low and high up. Notice how peak torque in this build is at 5800rpm, just before it falls off torqueband. Claiming otherwise is just ignorance in how an engine works.

[Guido]

Originally Posted by Flashmn

Toyotas vvt doesnt work like Vtec where there's another lobe...

"The VVL portion of the system is similar to Honda's VTEC system, incorporating two distinct cam profiles".
http://www.corollaperformance.com/TechInfo/VVTLi.html
The photo clearly shows 2 sets of lobes. Each lobe has it's own peak.
Toyota chose to blend the peaks together so one occurs after the other. But they are still there. If they wanted to, they could have one cam (or set of lobes) peak at 3000rpm @ 100HP, and the other cam peak at 5000rpm @ 100HP. You'll have 2 peaks on the same engine. Doing it with a single cam is impossible. Have 3 cams and you can have 3 peaks, etc.

[Flashmn]

The photo clearly shows 2 sets of lobes. Each lobe has it's own peak.

Yeah maybe so, but still the engine has only ONE peak torque point. Try and understand it.

[Guido]

Originally Posted by Flashmn

Yeah maybe so, but still the engine has only ONE peak torque point. Try and understand it.

Understand that technically it can have two (or more) - as freakinbox said, which you denied. It's not rocket science.

[Flashmn]

Hey whatever.
This is pretty much beating a deadhorse