FTW RX7

i have an extra s4 compleat motor that i picked up for $100.00 i was looking into rebuilding it with one of racing beat race rebuild kits with carbon apex seals for $1000 and doing a mild street port. then their is the jdm turbo motors for 1600 with 56,000 miles on them
what do you guys think would be a better way to go?

canonize-ryda

i no from on this site that a streetport may give as much hp as a stock tII but not the torque.

Grave2NR

go street port and turbo, only way XD

funkjaw

iTrader: (3)

Turbo. So many reasons.

Aaron Cake

iTrader: (1)

This topic is a bit confusing, because none of the language is clear.

First, is this an S4 turbo engine you are comparing to? Or NA?

If it is a comparison to an NA engine, then there is no comparison. The stock TII engine will result in a faster car. Even if the peak HP is the same, the TII engine has far more midrange torque.

canonize-ryda

would it be near the same if the s4 na had a complete TII swap? or does the s5 still have more hp because it simply had more stock tobegin with?

RotaryRocket88

iTrader: (7)

An S5 TII primarily has more power than an S4 TII because it runs higher boost in stock form. There are other smaller aspects like a more efficient turbine design, slightly larger intake runners and higher compression ratio, but the extra boost is the deciding factor.

my86rx7

iTrader: (10)

I currently have a street ported 13b in my 86 rx7 and i can honestly say that i prefer my buddies Turbo II over my street ported motor. Then again i have always perffered turbos. I just thought i would give street port a try. Its personal preference overall but at the same time the other question should be: "What application are you using this for?" is it just a track car, or a daily, i mean i would be thinking about fuel consumption as well.

I know personally driving with a turbo setup, i used up fuel like crazy because i always wanted to stay in the boost. But then again i have a lead foot.

rx3gt

I would choose the S5 TURBO.

FTW RX7

sorry guys i forgot to say its a s4 N/A that i have the choice to rebuild vs getting the jdm s5 turbo motor an leave it stock

Aaron Cake

iTrader: (1)

I'd suggest sticking with S4 stuff then unless you intend to run a full standalone.