can somone tell me what is diffrent about the S4and S5, than say a 13b or 13bt ll.



im so confused....................help!!!!!!!!!!!!!

I guess we should pin a FAQ about this.



Are you asking just about the engine differences or everything?

i would like to know it all. i like to know the difrent between things. like you know when you are buying **** or doing mods.

im pretty sure there is a thread about this in the faq section.....just scroll through them and u'll find it

i can find nothing in FAQ can you help.



thanx

neither could I. I know there was something around here somewhere though....

TII = 13 Bt. Difference engine wise between S4 and S5 13bt engines are small.



The 13b 6pi, S4 and S5 N/A version have more differences. different compression, intake manifolds, ect.



The S5 body has modern mouldings, taillights, bumper covers, ect.



S4 = series 4 = 86-88



S5 = series 5 = 89-91

ok you that the 13bt is a smaller engine. what was the pont of having the S4 end S5 does it make that mush more power. and what is bigger on the Ss. like the hole thing roter and everthing.

What is giving the 13b 6port s4 and s5 different compression and is it high compression.

ok are the parts for Ss inerchangerable and would it be smart to do something like that.

PS thank you for taking the time to right back.

your friend:

rx7kid2gtt

s5 has more electronics too, electric seat belts, oil metering pump, etc...

so what is the power gans with the Ss. and y is there elctonics

No, i may have said that in a way that could be easily be misunderstood. The "13" in 13b means the displacement of 1300 cc. I really meant the engine *changes* between S4 and S5 turbo II are small.

About 15 HP gain, both turbo and N/A. Technology got better, so did the cars electronics.

thanks for all the posts.

if you all want to leave me with more info about then i would love it.

I believe the S5 rotors were lighter, which is part of the reason for more power over the S4. I've also read that the S5's were slightly heavier (the whole car, not just the engine).

S4 NA = 146 bhp

S4 T2 = 182 bhp

S5 NA = 160 bhp

S5 T2 = 200 bhp



Those are the stock ratings from Mazda. Higher compression, lighter rotors and a different intake manifold design along with a different auxillary 5/6 port actuation are the main reasons for the NA power increase. The T2's I believe had a different compression ratio too and a bit more boost for the power increase.



Like Phins said, some electrical changes in engine from S4 to S5 were from mechanical to electric oil metering pump (this is what lubricates the inside of our engines), different throttle position sensor (I think dual position instead of the single plunger TPS from S4) and mass air flow sensor went from the flapper door type to whatever the S5 is... I cant remember anything else.

The S5 intake plenum was also improved with VDI (Variable Dynamic Intake, I think it is).



S5 TII compression ratio 9.0



S4 TII compression ratio 8.5



S5 6pi (6 port-N/A) compression ratio 9.7



S4 6pi (6 port-N/A) compression ratio 9.4

im trying to figure out why rx7kid reported this thread?

reported it? WTF? he sounded pretty damn pleased with the help he was getting

i think he got confused and reported it

no your just a bastid rob lol. this poor guy sounds confused. The ECU in jeff's (DJ Blu) 88 T2 is about 2 times the size of mine. The turbo in the S4/S5 cars are different, the injectors, the pulse dampener (no more fire), the wastegate is slightly larger (.5mm i believe) and works better.

wtf i couldnt edit that



The cooling system is larger and better working in the S5 car too

plastic water neck (i'm making alloy ones and taking orders now lol)

s5 = win

what's the difference between bhp,hp,DIN and Kw & SAE power ratings? https://www.nopistons.com/forums/pub...1047683561.gif



My S4 certainly seems like more than 146 bhp....

It's because you don't have a turbo. All my n/a friends say that then i give them a ride in my car.

I meant base horsepower. Most stock NA's now would put out 100-115 at the wheels. That's pretty weak by today's standards for a 2600-2700 lb car. I guess it feels like more. Maybe back in 1986, it was considered quick. Anyway, the faster you go, the slower you feel. It just takes time to get used to it.

The gearing plays a role in the performance.

bhp = brake horse power (the dyno puts a brake on the engine to see how strong it is)



hp = horse power just another way of saying it (i think)



SAE = is horse power (torque x rpm/some number like 5252 i believe)

kW = kilowatts (kilojoules/second)



different measurements (basically like american and metric)



both are force delivered over time in a way

Well after driving a what-I-thought-was-quick Celica,the FC absolutely blows the doors off it. Plus,my FC also has a custom exhaust system,but still uses the factory header and cats,so maybe that's why it feels a little peppier?

Don't get me wrong Mike, I'm not trashing our NA's at all. They do feel peppy and they're great cars. All I am saying is that the faster you go or the more used to it you get, you start to think its no big deal and you just want to go faster and faster.

Yeah, after driving for a hour or two on the interstate, its almost impossible to stay under 40 when I get in town.

lol, forget it.. I'm not saying drive like an *******



I'm saying its like going from driving an FD everyday to a Hyundai Accent or vice versa. You get used to whatever you're in.