rotaryaddiction

just curious

BDoty311

86-88- 146 HP

89-91- 160 HP

Relisys190

iTrader: (4)

very good. you beat me too it Bdoty311. oh by the way. those numbers are at the FLYWHEEL.

SonicRaT

iTrader: (6)

Hmm, strange, my gxl has about 240... Oh, it's that damn evil snail under the hood

brianmcd

What changed giving the 89 more horsepower? Thanks. I'm new to second gens but I might be getting an 88 GTU soon.

~brian

rx7raca

why does the s5 have such a bigger increase in hp, i kno the intake manifold is different, it is that the rotors are different? plz explain thanx

SonicRaT

iTrader: (6)

Higher compression rotors, and the VDI intake.

brianmcd

So is it worth buying an 88 GTU with 76k miles on it, or should i wait and get an s5?

SonicRaT

iTrader: (6)

It's definatly worth it. Get any that you can really, they're both good in their own way. If you can get a s5, get it, if you can get a s4, go with that. Either will make you happy

BDoty311

Ya the S5s have a different MAF sensor, intake manifold, and have lighter/higher compression rotors. But they are also alittle heavier, so beware....

brianmcd

I see, 14 HP is a lot though. That would mean it'd take me an exhaust to get just up to stock for an s5, wouldn't it? Thanks for your help. I'm new to second gens. Oh yeah, and are GTU's good? I haven't learned the differences yet.

~brian

SonicRaT

iTrader: (6)

GTU is the best s4 NA as far as sport/racewise. It's the lightest with the best features. For a s5, it's the GTUs.

BDoty311

GTUs are the best n/a model available. They have 4.33 gearing and a few other things I cant think of.

brianmcd

Ok, cool, thanks guys. Does anyone here have aim so that I can ask em a few questions to educate myself?

~brian

SonicRaT

iTrader: (6)

SonikRaT

Icemark

yeah, while peak HP is up 14; peak torque is only up 2 ft/lbs in the 89-91... so that extra HP is not worth very much.

BDoty311

Oh yes this reminds me, the S5s redline is 8K instead of 7K. Most of the added power comes from the higher revs, which the S5s were made to maintain.

Icemark

yeah, peak torque moves from 3500 RPM on a S4 to 4000 RPM on a S5.

jgrts20

um...............i think they put a bigger snail in it, maybe!! mine has more then 146 only because of the mods i have..........my bad its not stock, PEACE!!

so why did they move the peak torque to 4000?

silverrotor

iTrader: (1)

Additionally, the hp Increase was attributed to a lighter Flywheel, a more adapt ECU and a more "efficient" AFM.

Incrementely, this all added up. Conversely, Individually, not all that significant.

BDoty311

We are talking about n/as, not TIIs.

BOOSTD FD

how much does the Turbo 2's have?

BDoty311

S4= 176 HP
S5= 200 HP

Im not positive on these numbers, but they are roughly correct.

Icemark

try 182 HP at 6500 for the S4 turbo and 200-202 HP for the S5 Turbo

Icemark

and the numbers have now been added to the FC FAQ at the top of the FC section