Chip

iTrader: (3)

The transmission losses on that graph are absolutely MASSIVE and same for several other cars run the same day, is this something other people have oserved at EA, or is this unusual?


Over 40bhp lost from an XE with an F20 gearbox is just NOT realistic at all, I dont see how that figure can be correct at all based on my experience of the same setup.

Garage19

Can't see the graph as work have banned photobucket but...

I thought it was legendary that EA rollers always over read.

Chip

iTrader: (3)

The Wheels figure if anything is lower than you would expect (although obviously that may just be that the engine is down on power) its the 25%+ transmission loss from a fairly efficient FWD box that just seems way out.

Im not having a go, its possible the box in question is knackered or that the brakes were sticking slightly which would lower the wheels figure and raise the losses, loads of possibilities, so just interested to here peoples opinions.

mark-rst

My Nova made 191 at the wheels with 220 at fly from memory

I can check graph at home later, it has a fresh built F20 box

This was run last month

Edit to add

Its a redtop running carbs, not standard engine

Bullett

iTrader: (2)

anyone know if a mk2 silver gte with a calibra turbo in was there?

Chip

iTrader: (3)

15% or so like that is FAR more what I would expect, that sounds spot on.

Chip

iTrader: (3)

Bullett

iTrader: (2)

thats the beast! my mates one,he works at our witham store.he said made 308bhp and 314lbs ft.on the phone i said if at ea take of 30-40 bhp

im no vauxhall fan but i love that car,so well prep'd and very responsive

Chip

iTrader: (3)

Its a fucking fantastic motor that IMHO

mark-rst

Seen this car go! The torque steer the car has is just

Very nice Mk2!

Chip

iTrader: (3)

jr

hows that chip, using the equal length shaft ?

Bullett

iTrader: (2)

good opinion.just dont tell him that cos his head will balloon

tbh ea's rollers are up and down ive seen overrated power runs and underrated at times too.

Bullett

iTrader: (2)

mark-rst
thats fake torque steer mate. shake the wheel from side to side.


CHIP...whats the way to sort it cos he obviously dont know..........................................sayi ng that dont cos then he may be as quick as my saff

Chip

iTrader: (3)

Yes mate, equal length shaft kit and decent suspension bushes will sort it out a treat, especially with a good diff in there too.

Jim Galbally

does he run up some cars in 3rd? hence making the corrected figures look odd?

jr

Laney's mk2 is lovely, few lovely touches on it

Bullett

iTrader: (2)

he has a trick diff already.

cossie4i+

iTrader: (15)

I took my car to EA and then a month later to Surrey Rolling Road.

EA showed the car to make 391Bhp & 315Bhp @ the wheels

Surreys Showed 371Bhp & 315 Bhp @ the wheels.

So its upto you what you think.

Steve.

PF Dave

Is that Laney's car?

RWD_cossie_wil

iTrader: (9)

My old Stg 3a+ saff made 369.8 BHP and 356 Lbs/ft , 341BHP@the wheels, the spec was 25psi dropping to 23psi, 7.7:1 comp, 25/26mm head, BD14 both cams, Green 803 injectors, T34.48, 500 cooler, vernier pulleys etc, I always thought that it was a bit optimistic, but the car absolutly flew and beat quite a few supposedly considerably more powerful cossies and other cars , Bit of an oddball spec regarding the headwork/cams etc, as the car was built for 400+, but the original lad I built the engine for decided to stick to 803's and a .48 turbo .....

The car was mapped there as well, and I am convinced it was a crap job, as it was fine on full boost and felt rapido , but part throttle was jerky and fluffy, and the car was awful on fuel, 20/30 miles to Ł10 of juice, and whenever you were booting it and changing gear fast, or coming down from a high speed run (73mph ) it used to pop fucking HUGE flames out, great big fireballs , not like a touring car "pop" flame, but ones that lasted 5-10 secs if you were on a trailing throttle long enough, and lit the whole road up at night - very sooty exhuast as well, so I imagine it was probably running about 90% C.O

Bullett

iTrader: (2)

yes dave it is,and it never see's dirt cos he cant be bothered to wash a car

XRT_si

iTrader: (2)

My mate just got dynoed last week there in his Cossie at 374bhp @27 psi. Its standard internals, with a T34.63, RS500 pro alloy cooler, light blue injectors and BD10 and standard cam.

Does that seem right as a few people have said its EA rollers and it cant be that kinda power?

PF Dave

LOL - I remember when he was running that nail of a Mk1 about, can't believe he's finally finished that one. Hats off to him though, looks like he's done a good job of it!

Bullett

iTrader: (2)

lol that mk1 was a legend!held together with no more nails!
this one has taken him a long time but was so worth it,stunning car and very well finished.

Jim Galbally

my XR4x4 made 170bhp on their rollers.

they DEFINATELY had the speed vs RPM wrong tho, as according the graph it revved to 500rpm past what the revlimiter was

didnt trust the figure at all

Billabong

IIRC, Spadge got 480bhp @ fly on Greys............

Chip

iTrader: (3)

If that boost is held then it could potentially be right if its a really good map

Chip

iTrader: (3)

29bhp transmission losses on a RWD car with 370bhp and 40bhp losses on a fwd (typically therefore lower losses) and 150bhp


See my point here? LOL

SteveB

iTrader: (3)

You are correct and then around the 420-430 mark on PTS's rollers a week later

Noisy Boy

how do you get a spot on reading?

RWD_cossie_wil

iTrader: (9)

I thought it was a bit low , I was expecting around 15-20% RWD, as I thought 4x4 was normally around 35-40%?? FWD normally around 10-12%?

PinkRinse

Ummm I'm not an expert on rolling roads and figures etc but I took my car there in March and it made exactly what I was expecting. Infact the guy asked me what I was expecting (I said 170, as tested at Janspeed) and he did 3 runs til it came up 171.3, so it was spot on for me.. exactly what I was expecting. Nice guys in there and a rather mad dog in the office.

Chip

iTrader: (3)

40bhp loss on a fairly efficient FWD transmission again there :S

Billabong

So they did three runs, until it made the power you were expecting...... what did it make on the other 2 runs, and what was the power at the wheels for all three?

To get an accurate flywheel reading, engine dyno' it.

Chip

iTrader: (3)

Yep, thats the way to get a SPOT ON reading of what your engine would do if neither it, or the exhaust, or the intercooler etc were anywhere near a car

Oh and potentially if it was run leaner too, if you look at all the SCS dyno plots of course!
(12.5 in the car? umm NO!)

PinkRinse

Now this is where I come unstuck.. Power at the fly.. power at the wheels.. It made 168, then 169 and finally 171, whether that's at the fly or wheels I'm not sure

Chip

iTrader: (3)

It made 130 @ wheels, 171 @ fly


Its on your graph mate!


So they think it lost 40bhp between the engien and the wheels somewhere.

NathR

EAs rollers massively overead from what I've heard. Kev.H ran his FRS there and with minimal mods, with which every other FRS would typically make 250-260BHP, his made 295BHP!

Deleted by Request

...to the original question...


...they are like any other rollers..inaccurate as they are meant as a diagnostic tool only with an option to get a very rough power figure...the dyno is the only true way of finding BHP.