average joe

I am currently running the Stage 1 Weistec S/C so a healthy 640BHP.

Just wondering if any one has gone from Stage 1 to Stage 2 and can comment if there is a "real" noticeable difference.

I have a Quaife LSD fitted and struggle with getting the power down so another 100 lb/ft of torque will only add to this problem.

I have a IPE exhaust fitted so in theory the upgrade will require the IPE LTH and a smaller puller along with a new map.

Thanks in advance for your input

abcut973

You said it all. You'll need basically LTH + a re-tune.
I think that is the only difference.
But actual blower owners can chime in.

average joe

Thanks for the Reply, But maybe i was not clear in my initial post. (I am English so that's my excuse ha ha)

What i am wondering is can you actually use the extra power or do you just get a lot of extra tyre smoke. Can you "feel" the difference in acceleration / Power.

abcut973

Oh my bad! Well I'll let stage 2 owners give their feedback

turdferguson

What rear "tyre" are you running??

average joe

Yoko Advan sport 255/30/19s

Which are getting changed to 265 PSS in a couple of weeks just to see if it helps with putting the power down.

I even fitted KW DDC suspension to see if that would help and to be fair it did but i still struggle to get a good launch.

average joe

Yoko Advan sport 255/30/19s

Which are getting changed to 265 PSS in a couple of weeks just to see if it helps with putting the power down.

I even fitted KW DDC suspension to see if that would help and to be fair it did but i still struggle to get a good launch.

Kriston

How do you like your Advan Sports?


From a dig I actually think they are stickier then the PSS'.


I have the same tire size with a lot less power and still slip. I can imagine what you are going through when trying to launch the car.

Autosport7

Im not sure what you 'd expect from a 640bhp (congrats on the monster btw) car at a launch without running slicks that have been spun.
Unless you run a widebody and head towards a 11" wide wheel with a minimum 295 or better, I suspect you will always have this problem...
And asking if more power makes traction better... isn't that kind of an oxymoron? lol

Weistec

The difference is about 5-6 tenths in the quarter mile (half a second or more). It is a huge difference in horsepower and torque.

There are supercharger hardware changes but they are minor. Please let us know how we can assist. Thanks!

Weistec Engineering

avery.whss

I had PSS tires, car just burned rubber when I would WOT it, I have P-zero's now (285's), it hooks up 90% of the time even with ESP off and I'm running 470whp or so..probably 50-70 less then OP is with a S/C

Ingenieur

you do not have 470 whp unless you have a sc

with 15% loss that 555 at the crank
loss is typically 20% or 590 at the crank

avery.whss

i went to 2 dyno shops and ran similar numbers...one day was 486.9 and one was like 469.8 - I dyno'd 413 one run and 430 another day stock ...I raced my friend in a R32 GTR running around 490-500AWHP and passed him in 3rd..he took me off the line by a car length launching @ 6k ...do you think living right at sea level helps? some guys have told me they get walked on by 300whp evo's in edmonton i'm guessing due to the elevation?




heres a pic of my friends GTR engine ..far from stock

Ingenieur

I don't care what the dyno said

there is no way stock wheel HP is 420 (avg)
most see 350 to 360 iirc
and no way are you making 480 (avg) at the wheels with bolt ons

it is silly to quote HP in decimals (469.8) since accuarcy/repeatability is 3-5% or 15 to 25 HP give or take

sea level doesn't matter vs. rated power since engines are rated at sea level

Autosport7

Oh boy...
This is one "friendly" debate () I can not miss.
It is rare that I ever disagree with Ingenieur, not going to start now. I know the mans background and well lets just say, he has more knowledge than most.

Question is, how do we know who or in this case what is more accurate?
Ingenieur vs. Dyno!!!
Scientist (if you will) vs Machine designed by Science....

Jasonoff

Mine dyno'ed 469.69WHP...

Autosport7

This does seem the avg I see with people having similar mods.
I have yet to get mine on a machine, but sometimes ask what the point is as I know it will read somewhere around 440's - 460's.

Merc63

I am running all seasons, but for the first time today I was cursing in third gear and pushed on the gas hard and she started to spin.

I can spin first and a second gear like I am on ice.

Street has no traction here, but on the track with drag tires I dead hook.

johnnyblaze

on my 91 tune I have 483whp
on my MS109 tune I have over 500whp, 506 to be exact... this isnt magic.

Ingenieur

Unless you have
Increased displacement
Increased compression ratio
Added manifold pressure
Or added 1200 to 1400 in revs and air/fuel /cams to sustain it

You are not making 600 crank - 20% = 480 whp

If you are it IS magic

Just got a new project at work
Test and approve a chassis dyno for use to rate power and baseline emissions on engine packages

Bear in mind that the SLS ONLY makes 560 and only 8% more torque
Power is moot
Torque is what propels the mass
Power is a measue of torque application
P = t x w and w = 2 pi n and n = rev/sec

T = displacement x mean eff press / 4 pi
Mean eff p ~ comp ratio x vol eff x boost (if any)

No c63 m156 is making 600 crank hp on 91 oct

Believe what you like but don't **** on my leg and tell me it's raining
Lol
Mine makes 451.31415962
Give or take

johnnyblaze

I'll sh*t on your leg and tell you its mud.

I just like my Dyno results.

Ingenieur

If you shat on my leg you'ld have the experience of picking up your teeth with broken fingers
Lol

Seriously
Stock 450 @ 6500
Mod 600 @ 6800
33% increase!!!

Torque = hp x 5252 / rpm
5252 = 550 ft lb / sec per hp x 60 sec/min / 2 pi radian per revolution

Stock at 6500 = 363 lb ft
Mod at 6800 = 463 lb ft
28% increase in torque
Not possible without Cr or displacement
The vol eff is already very high on this engine
Add boost and youcsn get that much torque increase

The vol eff is > 1 already I estimate 1.06

Ingenieur

Torque = 6.2 l x 61 cu in / l x 11.3 x 14.7 psi x 1.06 / 4 pi
= 5300 in lb
= 440 ft lb

Units = cu in x lb/sq in = in lb


Boost effectively raises the vol eff
1 atm basically makes it 2

johnnyblaze

All that and my Dyno sheets didn't change...

Any other tricks you have?

Jasonoff

Can you check again just to be sure?