i know my dyno is kinda low. dont know why? i go 150whp max.
05 mcs 6sp auto.
mod list: alta 15% reduction, alta CAI, stock header with cat, invidia cat-back, IK22, SSR 18inch.

 

what type of dyno? afr's? the 18's probably robbed some hp

 

oh btw, the guy started in my 2nd gear and that's 2nd gear pull. he didnt do 1st gear pull, it is there different or same?

 

dyno jet, afr is around 11-10 at full boost

 

what is stock dyno number? anyone know?

 

wheels do not rob HP on a dyno... LOL this is another myth... I have tested these things... 1 whp diff from light wieght 16s to 18s... what you do feel is the difference in unsprung wieght on the street... but this has nothing to do with the accual HP of the car...

anywho.. this is accually not that low.. I have seen #s like this many times... chances are you have lower compression than say those (like my self) who had high #s.... Also.. you may need a better IC... and or a fan on the IC would help.. cause if if you are blowing hot air into the motor it will retard timing due to knock and there for you make poop for power..

 

what in the sam hell.... there's yer problem right there... you dont do pulls in second!! 3rd or 4th ... LOL

yep.. that'll do it... LOL wtf

 

actual hp not from second gear?

 

the HP is scewed due to the gearing and load... or lack of load for that matter...

see you are thinking your HP is low... but honestly you have no point of reference since almost every MINI that I have expirence with or heard about, is dynoed in 3rd gear... your 150 is accurate... but is relative to what? ... see what I mean?

people ussually seek 1:1 ratio... which is fourth... but this only matters for comparing your car to something other than a MINI... with 3rd you don't stress the car to 120 MPH or whatever depending on your rev limiter.. but still get consistent testing ...

 

so what will it be come up if he pull the first gear? anyone have same issue here?

 

sorry I couldn't help more

 

i mean if he start with 1st gear do i get like around 180whp or something close?

 

no you have it backwards my friend
please read the edited post #9 :D

 

i got it now. i was thinking backward.. because i think that 1st gear is the most powerful gear. so to tell the true power you have to use 1st gear to measure.

 

it's aaaaalll gooooood... we all gotta learn sometime... I am glad to help... just passing along what others have done for me...

this is really just the tip of a very large iceberg....

 

I was watching a show that was on speed for a season (can't remember name) where they were taking a stock rsx-s and turning it into a better track car and they where dynoing it after each mod. after they swapped to larger(yet lighter) set of rotors they dyno'd it and lost 12 whp. Thats why I thought the 18's might have robbed some hp

 

Dont forget you have a slush box which in theory will sap more power then a manual, most Minis dynos graphs you see on here are manual gearbox cars.

 

But i bet they didnt dyno it in first or second! edit, I didnt see it was on a auto, therefore the # mightnot be that far off. but really go for some 4th gear pulls. (is it that close to the gear ratio in 4th on a manual?)

 

there's something called the effective mass of the car. This is a function of the gear your in and comes down to the fact that in different gears you have to put different amounts of energy into the rotating parts. I don't know the numbers for the Mini, but for a 60s era american passenger sedan the first gear number was 2.2! That's right, in first gear the car acted like it weighed 2.2x the curb weight. You're thinking that first gear is more powerfull, but it's not. It delivers more torque to the drive wheels, but less power. It has to do with gearing, and moments of inertia (what caused the lighter larger rotors to steal HP....) The most powerfull gear will actually be 6th, but because the torque is so low, it's not that fun.

Matt

ps, if you took dyno plots in each gear, you'd see that the peak HP is lower as you go from 6th to first.... There may be effects as you go to extreme overdrive that bend the curve, I haven't really thought about that one too deeply. I wish someone would give me that data set! Then I'd be able to calculate the effective mass vs gear.... Oh well.

 

The pulls should be made in the gear that gives the closest to 1:1 overall ratio. We use 4th gear on the Minis. There are other issues with the auto that will effect results. There are many articles about wheel weights and dyno numbers but it is a proven fact that weight affects results, just not as much as one would expect.

 

he actually dyno the 3rd gear and 4th gear too. but the 2nd gear is the max hp come up. lol.....i give up...for all the money and time i spend, and this is what i got.

 

you need a good method. Especially with forced induction cars with intercoolers. Good diagnostics are a must, water temp and air temps at a minimum, to ensure that you're in a repeatabile state. IF you are, the numbers run to run will be pretty close. If you don't have these controls in place, the dyno results can vary all over the place.

Matt

 

oh right on... that's crazy.... like I said... the diff is not enough to worry about... heck 16 rotas vs 17 inch S heavies from what I remember wasn't even a full HP... but yeah rotational mass on the street you will feel... especially from a stand still...

with the variance you get from doing back to back pulls... this there really was no loss....

I didn't realize this was an auto car.. those are very tricky to dyno.... but doable

 

just use the paddles to get the car into 4th... also don't forget most of the drag cars are autos...

 

I agreed with the answers way back.. 150 WHP with your mods is pretty close to what all the other would pull !! your OK!! NOW.... Water/meth induction and a HEAD!! you will be over 220 at the wheels... and we pull all our 6 spd cars in 4th.

Just me............................................

Thumper