Claudio RX-7

iTrader: (1)

Hello people,

In your oppinion, id like to know what is the most that the 13BT turbo engine (87-91) capable of withstanding, without dowellin the motor, in terms of horsepower numbers and how much boost can be run on it.

Provided you have a good combination of parts and great tuning.

Please let me know,

CrackHeadMel

iTrader: (2)

never mind, delete me

gsracer

as a general limit

s4 - 500hp
s5 - 600hp
FD - 650hp

13bpower

Depends on how long you want it to last. More HP will mean that it will blow up sooner. I think gsracer was fairly accurate though. Who knows how long those motors will last. though.

What about a Bridgeported s4 with a huge turbo and 30psi of boost. I'm sure it would make far more than 500hp, but it wouldn't last too long. also wouldn't spool up till 5000rpms.

razorback

http://velocity.isfaster.com/new/rides/soul/main.htm

very impressive. and dont ask the cost of the dogmatic tranny.

Dan H

Won't the S4 be able to make more power due to its lower compression ratio rotors?

gsracer

lower compression doesn't mean more power, quite the opposite. However lower compression does make it possible to run higher boost levels without detonation, so it's a trade off.

the s5 engine internals are stronger than the s4

Dan H

Oh ok, thanks for the info.

Claudio RX-7

iTrader: (1)

Dam sorry i wasnt paying attention to the post, thanks guys for all your input. As for the lower compression=more powe that isnt completely accurate, i agree. But when i asked this post, it was to find out how resistant to blowing up these engines where, cause ive been told that the FC engines where weaker than the FD's, which i know for a fact because i've seen the differences and the FD engine is tougher, hense their prone to self distruct after a certain point. I was told that after 450hp the 13BT engines tend to twist and blow out the housings from the boost, making the apex seals slide out and ruin everything.

What do you guys think?

Later,

Dan H

At least 13BT's are cheap though. I heard swapping in a 13B-REW is even more harder to do than a 20B swap. I'd say do it if you have lots of money to burn...

Otherwise, a built 13BT is a more wallet friendly path.

CrackHeadMel

iTrader: (2)

What S5 internals are stronger than the S4?

i only ask because i have an S5 engine and im building an S4 Turbo engine, i know the diff in compression bla bla but what else?

Claudio RX-7

iTrader: (1)

The only differences are compression and weight of the rotors, which is a good thing, the S5 motors do tend to rev a little faster than the S4, but that also depends on the ECU maping and porting differences (mainly found in the turbo and intake manifold design.

As for building up either of them the S4 will let you run more boost, the S5 will have lighter rotors, its up to you to decide what you want. I'd go with the S5.

What are you putting in it, as far as seals, porting, and other goodies?

Later,

Claudio RX-7

iTrader: (1)

I had my FC with Haltech E6S, TO4E turbo, FMIC, 4x720cc injectors, street ported, 3" exhaust, 93~ TT fuel pump, boshc fuel pressure regulator, and with rough tuning and the wrong spark plugs (NGK street ones) i got 323HP@16psi@6200rpms on pump gas, would've been more if the tuning, plugs and gas would've been better. Oh!, and i ran 12.9@118mph with 17" (340 treadware) Good Year tires.

My goal now is 400HP, but i have to build the car back up again. :P Sold everything due to financial stress. Have a look at my site for more info.

Later,