WV882ndGen

is it possible to bump the power up to 200 relatively cheaply on these 13B NA engines, and still be reliable?

cwsttu

cheap = unreliable

and search it has been covered many times... better you hear it from me than somebody that acts like an *******

scathcart

Yes.
Intake cone filter and full exhaust should put you around the 195 BHP mark.

BlaCkPlaGUE

I can't believe that! Theres guys here struggling for 175bhp, let alone 200. Eh, but I could be wrong.

uRizen

iTrader: (2)

Hmmm, i don't know about that. I'm running gutted cats, a Racing Beat y-pipe, and dual HKS 4" cans for an exhaust. As far as other stuff goes, I have a cone filter intake, cleaned and balanced injectors, full re-grounded engien and chassis, and it's fully tuned and I'm don't think I'm pusing near 200hp. Probably more like 170-180 BHP tops. It does feel alot smoother and definatly pulls harder with the filter and cat-less exhaust though.

cwsttu

i think he is being sarcastic... scathcart knows better than that lol ... read the dyno section... people are struggling to hit 185 with full mods and stock ecu and whatnot.... however his post is misleading to an extent but was more than likely humor

BlaCkPlaGUE

thats what I thought! heh, I just didn't see no happy face or any of this :p stuff goin on...

RotaryWeaponSE7EN

iTrader: (6)

Do want that at the wheels or the motor. Cause to make it at the motor wouldn't be to hard. But putting 200rwhp down would make the car a little less reliable.

scathcart

Stock BHP for a S5 is 160.

On a good compression engine S5 full exhaust and a cone intake filter will put you at 160 hp to the tires. Factor in your 15-17% drivetrain losses for those power levels, and what bhp do you get?

scathcart

BHP is brake horsepower, as measured via an engine brake dyno. It gives an accurate measurement of engine horsepower at the flywheel, as it is not affected by rotational inertia.
The poster asked if it was possible to achieve 200 hp reliably. Without specification, assume he meant a 200 hp engine. My answer was correct.

185WHP is approximately 220 BHP.

RotaryWeaponSE7EN

iTrader: (6)

Thats also based ont he fact that u know what the % of hp is lost through the drivetrain. It also depends whether or not he has a stock clutch and PP. Basically start mods and save money for dyno time is the only way to be sure.

dorkman52000

He has an S4, though, with something like 142 bhp. It's going to be harder to obtain the 200 hp mark with just a filter and exhaust with an S4 than it is with an S5

scathcart

Correct, and I am able to state such answers b/c I have measured this.

A 265 bhp bridgeported 4 port engine, as measured via an engine brake dyno, put down 224 hp when mated to a 2000-mile rebuilt TII transmission with synthetic tranny fluid and a stock TII clutch-pack differential. (note: not my car)

Based on this first hand knowledge, I estimate normal power losses through the drivetrain to be 15-17%.

Stock PP would affect rear wheel horsepower measurement or an engine dyno, but it would not affect BHP.

Also, given a 12 lb drop in rotating mass at the flywheel/clutch assembly (about the max you can go with on anything but a multi-disk clutch set-up), a 2400 lb car, by calculation, would gain 9-10 engine hp, or approximately 7.5-8 measured hp to the tires. BHP would not change.

scathcart

146 bhp.
Mark's basically stock S4 block (very light port cleanup) with S4 rotors (lower compression), exhaust, intake filter, and an S5 VDI manifold set-up saw 175 hp to the tires... That's still over 200 bhp... and he passes emissions.

Of course, all of these values assume a good compression motor in good tuning.
Heck, these listed values are even including use of only the stock ECU.

dorkman52000

Cool. Thanks for showing that, because now I will be adding that to my list of things to do!

scathcart

Showing what?

dorkman52000

The S5 manifold......sorry; posting that
I'm still learning about all the little things you can do to these cars

scathcart

Personally, I don't even think its that significant a power increase...

Dom_C

it is not significant. . but it does help and smooths it out a bit. . if you add the s5 manifold along with full exhaust and intake it will show it self a little more.

Jager

iTrader: (10)

Air Filter, Full exhaust, streetport, and a shot of NOS can get you there. .

rs_1101

am i the only person here who knew the diff between BHP and WHP before scathcart had to spell it out? lol

NZConvertible

Mark's S5 UIM was expensively modified using the Extrudehone process. It was not a simple bolt-on affair.

orangegarage

nitrous, just not to much, and not very often on a new engine w/good seals is ok. You can get 200 at the wheels.

BklynRX7

WTF is the extrudehone process? is that like porting? Im asking cause i Just bought a set of s5 manifolds from rotary resurrestion and was wonderign if there was any way to modify them before I put them on.

Sartori

Well I just got an 88 and am also looking to improve its HP. First things first tho and thats getting the engine maintained which means a 90k service on a 94k engine. Thats about 500 bucks right there but after that this is what I plan on doing to it (as of now)

Stock HP ~147
~Racing beat exhaust: Downpipe, presilencer (pn 16209-$290-18hp gain on a 87RX-7) and Y-pipe and mufflers (pn 16420-$576-with a 5-7hp gain)


~HKS or K&N intake: Not sure which yet so no part number, but either should give appx 7 hp gain for about 180 bucks.

~Im looking into new flywheels as what I understand a better one would give me more response at lower RPMs and would mean faster shifting? which means quicker car.

~a Twin Power Rotary ignition amplifier from HKS: "The Twin Power ignition amplifier incorporates both the CDI and transistor method ignition to provide optimum spark duration and maximum voltage output, resulting in crisper throttle response and a smoother engine powerband. The CDI method, capacity discharge ignition, provides maximum voltage by transferring all stored energy in the capacitor to the ignition coil so that the ignition current can buildup quickly, thus making the Twin Power very effective in the higher revs where a normal spark would tend to diminish. This strong rapid spark prevents the high rpm ignition miss that reduces peak power. The transistorized method generates high voltage by using transistors to cut off current to the coil, thus allowing for a long energy discharge. This longer spark duration allows the Twin Power to improve lower RPM throttle response and torque. The combination of the CDI and the transistor method incorporates two distinct systems into one high performance unit, hence the designation of Twin Power. The Twin Power produces a spark output that is typically 1.5-2.5 stronger than of the stock ignition system and consumes about 35% less power input than other ignition amplifiers."

So those last two things there dont actually add HP but would take advantage of the HP increase of the exhaust/intake kits and would seem to have a great benefit. Sounds like if the car can have stronger responses in the RPM ranges plus more HP from "bigger lungs" than that would satisfy me.


add those intake and exhaust to the stock HP of about 147 and you end up with about 179. I dont know where you would get 20 more tho.

*I admittedly know little of cars and performance mods so hopefully im not terribly wrong with anything I said*