can anyone explain the main engine differences between the xrs and rs types?
I know the xrs puts out like 50 more hp...
but I see posts about it being better to MOD the RS engine...
and that the RS engine has better torque...
...why?
first the compression rate is diferent
second the 180hp as the vvtl-i which gives more high end torque as for the mods i dont know you sould ask the celica group the 2 engines are used in celica's
130hp was modified from the celica gt (140hp) and the 180hp is in the gts
On 2002-04-21 14:07, mistamatrix wrote:
Engine mods? Nah. Maybe just the bolt on stuff. I/H/E.
A header for the 2zz will not be available for a long time to come, the reason being is that the factory one is excellent, greddy tried to develop one for the celica but they didnt see any gains over the stock unit so they gave up, hot shot makes one for the 1zz celica.
biggest differnts is that the XR is just better balance engine with the XRS you have more horse but need to add so you can get the top and lower end balance. Also did you konw that toyota made a mistake on the 2004 XRS by riping us off 8hp. The hp is 172hp and was sold at the dealer saying it was 180hp. I am fighting this at the momment they r offering me only $100 Dollars for this and will not budge with anythin else. By taking the $100 dollar I wave any futter settelemts. any one have this or ricived theis letter also. let me know.
The major difference between the two engines (1ZZ in the XR and base Matrix, vs 2ZZ in the XRS) is in how the valve train behaves at high RPM.
The 1ZZ engine has a fairly normal valve train. The VVTi system varies when the intake valves open and close to give high performance when you need it, and good fuel efficiency and clean burning at other times. The cams push the valves open in the normal way as the VVTi system just varies the position of the intake cam. The exhaust cam is not variable, which is also typical.
The 2ZZ engine, on the other, has a trick up its sleeve. At high revs (above 6000 RPM) it slips a shim into a different position for each valve (powered by oil pressure, controlled by the engine computer) that causes the intake and exhaust valves to open earlier, open further, and stay open longer. This allows the engine to handle a LOT more air and fuel. They call it "lift", because it lifts the valves up higher (or lower, depending on whether or not you are standing on your head), and I'm told that when you hit "lift" you really get thrown back into your seat. The torque curves for the 2ZZ engine show torque really jump in the neighborhood of 7000 RPM, whereas the 1ZZ engine torque has really fallen off even by 6000 RPM.
Below 6000 RPM the two engines behave similarly. The 1ZZ actually has slightly better torque in that range, but the XRS (with the 2ZZ) is geared to rev higher so actually has more torque to the wheels (with slightly higher engine revs).
Also, because the 2ZZ engine has slightly higher compression, it requires premium fuel, whereas the 1ZZ takes regular.
If you don't plan to really make the car scream, the 1ZZ engine is the better option for most people. If you want the thrill of really screaming in a car that doesn't cost an arm and a leg, the 2ZZ is the way to go.
I drive an XR: 2nd gear to 60 MPH (6000 RPM) gets me onto a highway as fast as I need to go!
Well you could supercharge your 1zz motor for a few grand, raising your price to about what an XRS would cost, then still get beaten by the XRS and have worse gas milage, or you could just get teh XRS from the start and have a clean car that starts life fast and go from there. Why pay a bunch of money to mod a weaker motor when you could buy a quick car and go from there?
The best thing about the XRS motor is that you can go easy on it and get 34 mpg but when you are in the mood you can goose it and own most other cars. The only thing I can think of off hand (4 cylinder, front wheel drive) that is quicker than the XRS stock is the Acura RSX-S. Even the Sentra Spec-V loses to the XRS due to the 2zz-ge's extremely high revs. We do lose out to the RSX-S, but not for long. When I get my Injen intake and catback exaust I should be able to beat the RSX-S. We'll see......
Yes, a supercharger on a 1ZZ costs a lot, but the supercharged 1ZZ gives you a power and torque boost without having to rev it very high (at 4000 RPM torque is boosted to 145 ft-lb, vs 125 stock), while the 2ZZ engine gives you an even larger boost, but you have to rev it high (a bit above 6000) before you outperform even a stock 1ZZ engine.
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