Toyota Celica Supra Forum banner

1 - 12 of 12 Posts

·
Registered
Joined
·
1,089 Posts
Discussion Starter #1
I just bought an 82 Supra L type and am curently replacing the cracked head I didn't realize it had. Going well and all, no big deal and I still love the car.

Anyway, while I'm in the process of fixing everything I was considering doing a few minor mods... Filter, AFM Spring, EGR ect. I was looking on the internet and found a table that stated that the 1982 Japanese spec. 5m-ge was rated at 170 Hp and the 1982 Americn spec. was rated at 140Hp. It also listed that the bore, stroke, and compression were the same.

Sooooooo, is this true or has someone made a mistake? If it IS true, what gives the higher output? ( I want it! )

Thanks in advance.
 

·
Registered
Joined
·
792 Posts
I don't know the answer, but I'm willing to guess that they either used the non-american hp calculations, which is a bit different than ours, or its because of our lovely emissions! Could be a combination of both.
That's just my thinking though, I could be completely wrong!
 

·
Registered
Joined
·
793 Posts
I think it has to do with different HP calculations, and I heard somewhere that dynos over there work slightly different. dont know if that is true tho... Also im sure egr plays a big part.
 

·
Registered
Joined
·
2,100 Posts
I remember someone saying something about ecu and the fule maping? I could be totally off base..

will
 

·
Registered
Joined
·
1,089 Posts
Discussion Starter #7
Hmmmmmmmmm. Hp Calcs eh? That sounds like a promising proposition. I think I'll look into that.

On another note, I thought that the egr was maxed at WOT at its highest rate to reduce combustion temp by adding "non-combustable" gasses and there by reducing NoX 's formed. I think it is vaccume controled and has the highest flow rate when the intake pressure is the lowest. ( eg. under hard acceleration)

I'd better get a grip on this before I monkey around with the egr. Ah never mind, I'll just play with it anyway!
 

·
Registered
Joined
·
1,537 Posts
EGR system should open up the EGR pathway at 2500 rpms at partial throttle. At wide open throttle, it should be closed, so may not really affect max HP.
One advantage of disabling EGR is that it will keep the intake cleaner. NOx will go up though so you may not pass emissions. Could possibly get a ticket for disabling it too. :?: Not really sure.
 

·
Registered
Joined
·
1,089 Posts
Discussion Starter #9
Closed at full throttle eh? Who am I to argue with the masses. I have now heard this from a number of different sources so I must be mistaken.
Closed at full throttle it is!

Thanks for setting that straight.
 

·
Registered
Joined
·
914 Posts
I've just read that the compression ratio for the US spec mk2s is 8.8:1. Is this right? If it is , then that would explain the lack of horsepower. Elsewhere the comp. ratio was 9.2:1.
In the UK in '83 regular gas was 98/100 octane and I think 105 was still available. :D

This is from the European '83 brochure


PS is the German standard horsepower measurement, which is the same as hp (SAE).
 

·
Registered
Joined
·
790 Posts
The later US Mk IIs (84-86) also had the higher compression engines, but are rated at 161 HP. Personally, I think its the emissions equipment (just my opinon though)
 

·
Registered
Joined
·
4,558 Posts
this is like the question "why does my 6mge not make the 'factory rated' horsepower?"

if im not mistaken the answer that is usually given is that their fuel is better than ours, and the ECUs are different.

im wagering the reasoning is the same as to why the 5mge has different power ratings.

also, euro/jap supras might have larger intake or exhaust plumbing, other companies have done such trickery on cars before.
 
1 - 12 of 12 Posts
Top