^ see topic please.

 

There have been several guys on the board in the 270-280 rwhp range and a couple close to 300 rwhp.

 

300 rwhp with tuning

 

what does it take......

plenum
reflash
intake
headers
new heads(those $2k ones that boost the c/r up)
test pipes
dual catback
lightweight pulleys
lightweight flywheel

youd probably get well over 300whp with that setup

total cost 4k plus install?

not too shabby!

 

That's pretty hot for $4k and a whole lot less work than FI. I'm still undecided as to whether or not to go with FI. If I did, I'd want a built motor for reliability. Hmm.

Thanks mate!

 

i think that list is wrong and here's why


those nismo heads are bad news unless you have some custom work done with some sorta of EMS to work with it cause I'm pretty sure a reflash is going to be a huge headache trying to get it to work. Jason put those heads on a car (jeff's maybe) and had a million issues with them and gave up.

You forgot to list cams - that's about 1200 for cams/shims then 800 for install = $2000 You will not ever reach 300whp NA without cams unless you go with the 4.3 stroker kit or something crazy expensive

lightweight flywheel does not gain hp. It'll make it accellerate into the hp faster, but won't gain any. Well actually in the lower gears you'll gain some slight hp, but people dyno in 5th gear with a manual usually right?

IMO the real cost to get 300whp is going to be more like $12k cause you're going to go with the best parts that make the most hp, not the cheap parts. And you're going to have to do all of them.

 

plus, it's important to make sure all the parts work with each other, otherwise you might end up losing power. This is why N/A mod is so difficult and costly, but got alot of respect.

 

hmmm, not even at the wheels? something about the Lower weight of the drivetrain leads me to believe youll gain some wheel hp. I know the enigne wont gain power, but the wheels will. get it?

same reason for lightweight pulleys and driveshafts. Drivetrain weight is the reason why you have BHP and WHP ratings. The weight is what causes you to lose the hp. Drivetrain weight reduction is a great way to gain whp.

also hp is time dependent measurement, the faster the work is done, the more hp was generated/used. capische?

o, and as far as install prices, get it done all at the same time, theyll already have your engine torn down to install the cams, heads, headers and pulleys all at the same time. itll save a bunch on install price.

 

Lightweight flywheel does not add HP on the dyno.

 

what if you have a 100lb flywheel that you reduce to 10lb? drastic yes, but you get the idea.
Less weight:less rotating mass = quicker spool = less time = greater hp at throughout rpms.

The hp curve will definitely shift left meaning an increase of hp at lower rpms. It may not increase 'peak' hp so to speak.

its all about the Physics

hp is moving 550 ft lb/sec. 550 lbs 1 ft in 1 second. A quicker spool cuts down the time, which increases the hp measurment.
100lb flywheel will kill the hp, but replacing it with a lighter one WILL increase the hp throughout the curve.

 

ive seen over 340...

 

I definately believe over 300whp is possible.

Lets not forget these posts are opinions and not facts, so lets not get Einstein on the topic of saying what is/whats not possible.

 

save the usless 13hp increase of the 05's......it seems like an increase of crank hp on a na engine no matter how small it is has a noticeable and direct positive impact on performance(especially when coming from factory). Yet these aftermarket upgrades even with dyno charts.....are a mystery.....car can make 200 more hp...yet shave on 2 tenths on a 1/4...its disturbing

 

Actually, you WILL gain rwhp if you install a lighter flywheel. You have an appox. 15-20 percent loss in the drivetrain. If you free that up with lighter parts, that power will go to the wheels.

 

can you give an estimate of what it took?
how reliable was the engine?

 

so are you guessing or have you tried it yourself? I have a bunch of mods. I have a tilton clutch etc. It really doesn't make the engine generate more power. It simply makes it reach it's power (accelleration) faster. It's the same reason if you dyno in 3rd gear you typically get about the same hp number as you would in 5th gear.



it'd just accellerate faster then, it wouldn't make the engine do anymore actual peak hp work. It'll just make it get into the heavy duty max work faster.



yeah you're reducing the loss, but it isn't making the engine output anymore work. When you install light wheels, pulley, clutch etc you don't need to add more Gas to the engine because the engine is suddenly running leaner with the lighter drivetrain parts. No doesn't work that way. The A/F stays the same cause the engine still generates the same amount of total power.



There's more to going fast than hp people

you have drivetrain weight, you have the weight of the car, you have gearing, you have aerodynamics, and then you have power

 

340rwhp NA? Racecar right?...What was the redline on said car? I suspect way more then 7100rpms...What about the torque on this motor?

 

sentry65 are you trying to prove me wrong or back me up!!????

i said it wont make a normally 287bhp engine produce 295bhp. im saying itll make a 230whp engine/drivetrain make like 240whp. (all numbers made up)

your comment about accelerarting faster into the power band............EXACTLY what im saying. Shifts the power curve left. Since the measurement of HP is derived with time and is inversely related then quicker accelleration implies greater hp at the wheels!

same applies with other lightweight parts....less work to spin the drivetrain means it can spin the wheels quicker. so when its on the dyno with a load on the wheels itll spin the spool up faster = more hp.

oh about your HP statement"
you know what BHP and WHP means right? you know the difference?

 

Why does a lightweight crank pulley increase hp but a lightweight flywheel doesnt? both work in the same manner, execpt one takes weight off the front of the engine, and the other, the back.

 

yeah i know the difference

I'm just going to have to agree to disagree with you then.

An engine makes a set amount of power - 287 bhp

it has a certain amount of mechanical limitations that mean by the time the power gets to the wheels it's making 235whp or so depending on dyno/temp/elevation/gas octane/ECU mapping, etc

if you add a tilton clutch, it's not going to put you at 240whp. Why? because even though you're taking the weight off of the drivetrain so that in theory the 15% or whatever drivetrain loss should be less, it really isn't. The only way for it to be less is if you have physically different setup as in the driveshaft was half as long or there were half as many junction locations where the hp can be lost - or the rubber transmission and engine mounts were converted to solid metal ones. But just taking weight off the physical parts will do nothing but YES shift the power curve forward a little more. It won't make your 287bhp engine work any harder to produce a higher peak whp number


it's the same as if saying if you could take a 350Z and make it lose 2000 lbs that it'll raise it's top speed - just isn't true. It'd be godlike at accelleration, but top speed won't increase

I think the saying is for ever 1 lb you remove from the drivetrain, it's as if you removed 7 lbs of dead weight from the car. It won't raise peak hp level. It might increase the area under the hp curve though.