Comparisons

Posted by: @petrus

 

 

@Dev most owners do not get near Celica number with the MR2 install. Indeed an issue with the too compact exhaust install. The 1ZZ likewise. Because the 2ZZ pumps out more it suffers more; it needs a relatively better exhaust system. And more reduction of the higher revs 😉

 

 Actually they do. About 160whp is what a stock Celica GTS makes on the dyno and it’s what most 2ZZ swappers make with the 1ZZ downpipe.  It has very little do with a compact exhaust system as much as a restrictive exhaust system. 
The difference here is the potentials between both engines and the 2ZZ responds better to exhaust modifications  than the 1ZZ. Because the potentials are greater the returns for cost is also greater with minor bolt ons. Without getting into cams and stand alone systems the 2ZZ in the Spyder has a clear advantage everywhere especially for an average owner who doesn’t want to do too much. 

For power, I had a PPE header and custom 2.5" exhaust after that, along with a PPE intake and put down 180something at the wheels in my 2zz car on a mustang dyno. 

Posted by: @petrus

a = F / m

Thank you for the equasion. You can see that the reduction of mass has the same effect on a.  It also applies when braking and cornering. Adding engine power not.

 

F at the wheel is what the engine produces x reduction.

The 2ZZ stacks 2k revs on top of the 1ZZ rev range. Say 30%. For ease of explanation say the power gains is 30% too. The air resistance increases as a function of the square of speed. Thus,  unless you put in a shorter diff reduction than the 1ZZs, you are overgeared. Thus leaving F on the table in the lower gears too. As I wrote earlier; simples.

 

You're moving goal posts as well as making comparisons that don't actually add up.  The  a 1zz and 2zz spyder will be relatively the same mass, within 2% so m becomes a constant in this scenario since we're comparing power of the engines.  We want to maximize F(force), so that means maximizing a(acceleration), the 2zz puts out ~10% more power than the 1zz through the same rev range, which increases a, therefore increasing F.

Bringing air resistance in is a moot point as it would be the same resistance for a 1zz spyder as a 2zz spyder.  Not to mention a 2zz spyder will have a higher top speed than the same spyder with a 1zz.  Even if both have the factory 5 speed transmission.  A 1zz will pretty well run out of steam in the upper 130s and barely hit the rev limit in 5th when going down hill, almost kissing 140mph.  The 2zz is still pulling along at those same speeds and will barely crest over the 150mph mark.