240 hp s4 na
 

hey guys i have a 86 gxl and i was wondering if there is any way in hell to get 240hp out of it without supercharging or turboing the damn thing i was thinking about starting with

hi comp rotors
some kind of porting
intake
larger injectors
exhaust
ems
tb mod
clutch flywheel and pressure plate


most of this stuff is gonna be comming from racing beat the only things i dont know what to do about is the ems tb mod and larger injectors if you guys can think of anything else then let me know please

A bridge port, at the least. You are going to spend a lot more money/have a less reliable motor trying to get 240HP out of an n/a vs. a turbo. If it's what you want, go for it.

-Marques

Not strictly necessary, but nice for the lower rotating mass.

Understatement.

If by "intake" you mean "intake manifold", then yeah.(*) if you mean "air filter tube", then it's insignificant.

Surprisingly not, the stock N/A injectors are quite large. They should be good to the 250hp range on a naturally aspirated application.

That kind of goes without saying, like porting.

Yeah, you turn the throttle body into dumpster food.

A knife-edge street port should easily meet 240hp but a bridge port would be cheaper to implement and easier on engine internals if you keep the revs down. It depends on if you want reliability or drivability. (High RPM means less reliable, bridge port means less driveable)

(*) I know people use Turbo intake manifolds and throttle bodies with minor porting on well modified engines and they allow 250-300hp naturally aspirated, but N/A manifolds are a bit different.

Lots of nitrous, hey you said n/a not all motor. :D

knife-edge streetport, peejay? what's that?

I just meant something that was all gung-ho for peak power at the expense of the rest of the powerband where you spend 99% of your time, unless it's a race car in which case you spend maybe 75% of the time off of peak power unless you have a *good* transmission with close ratios (for maybe a 1000-1500rpm drop from shifts at redline)

oh ... okay. thought i missed something. :)

No street port are going to hit 240 (flywheel?) unless you're spinning over 9kRPM!


-Ted

I dunno... 6-port Prod-style end housings reshaped with devcon for better flow, 12A middle plate with Prod porting (and water grooves cut into it) highly bevelled rotors, and a custom fabbbed intake manifold and header... well, that should get well clear of 240 flywheel. I can say this with certainty because Prod motors are at around 235-240 through the restrictive carb chokes they have to run. Possibly the ultimate streetport motor, unless you can open up the 13B-RE end irons farther than the 6-port ones... anyone have any experience there?

FWIW, I personally found the 12A Prod motor to be perfectly streetable when I was driving it around back roads to break it in. ;)

Or a bridgey or peripheral could do it far more easily.

Build a P-Port with a large carb 55mm or larger
 

The Bridge Port motor is good but, if your going to put up with the BRAP BRAP BRAP!!! sound you might as well build a P-Port. More power and will probably out last the Bridge Port Motor.

Good luck.

9-10k USD and you net 240rwhp? Give the dream up kid and just spend the money on turbo'ing your NA. Do a search plenty have done this and had good results.