POOR DYNO RESULT 16v - Saxperience

sexy_gt · 17th September 2010, 16:33

this afternoon i have been to my local dyno. saxo vts 2000 (97 engine 100k on it)

modifications are

milltek 4-2-1
saxsport decat 2"
c2 simota induction

i also have
baffled sump
mocal oil cooler
quaife box
billet flywheel
alloy crank/alternator pulley
(catcams 708) not fitted yet

peak rmp of 6,326 was 114.6bhp and 99.8 lb ft at 5,106

the power curve is very good. almost perfect only the peak is a little low.

the exhaust lambda sensor they clip in the exhaust gave an unreadable result and tripped the sensor itself. apparently normal for a decat?

i have no engine management lights on, i have no smoke exit the exhaust throughout the run and it appears to be in good health. plugs are new

compression test be required? could it require a remap due to the flow of the intake and exhaust? since fitting the exhaust ive felt a decent power increase.

the car feels strong and is used very regular on track. it never uses oil or
water.

i have a new set of catcams to go in then i am looking at some new management

ideas or comments welcome

Mochachino · 17th September 2010, 16:37

Still almost a standard engine. May have given a low figure on any other rolling road, but maybe this rolling road gives a lower figure generally?

How many runs did you have?

At least you have a Rolling Road result and print out to compare it when you have the cams put in and mapped etc. Can see your true gain rather than going off the book bhp and the gain from that.

sexy_gt · 17th September 2010, 16:44

yes exactly to be able to compare. only 5 minutes from my place. very convenient. i had 3 runs.

i do trust the rollers to be accurate and honest. a friend had his standard zafira 2.0 16v (random!) run same day gave 1hp less than book figure.

loads on here get 135+ with same/similar mods. makes you think other dynos lie.

im going back for a run when i have fit the cams. then again when im back from my remap. at the mo i am going to chipwizards. looking forward to comparing dyno results.

Russ_16v · 17th September 2010, 16:47

Did it feel underpowered? Have you noticed a lack of power?

If no, then I wouldnt worry, every RR will give a different reading - example is two iv been on, one have 193 bhp, the other 209 bhp.

If it pulls well, is healthy (as you say it is) then dont let it bother you mate, did it bother you before the run, did you have this done becauase you felt like there is something wrong with it?

Bear in mind, some small things can effect power, ie my filter kept sliding down my itb trumpets, and we didnt realise and was stumped why the car wouldnt make over 180bhp - we stopped the filter sliding and the next run was well over 190bhp

sexy_gt · 17th September 2010, 16:57

had a run because im doing a series of mods.

im quite pally with the garage owner so i get runs cheap.

Russ_16v · 17th September 2010, 16:59

then id use it as a base mate, and not worry about it

sexy_gt · 17th September 2010, 17:14

it can only get better i suppose

Russ_16v · 17th September 2010, 17:18

on other RR's I expect it might read more mate

sexy_gt · 17th September 2010, 17:37

cmon all you 150 brake standard vts lads on here. get your arses over to grimsby and get rolled...

Colin · 17th September 2010, 17:43

That power @ fly? Or wheels?

Standard vts's make about 95-97bhp at the wheels.

sexy_gt · 17th September 2010, 17:47

fly mate... as far as i am aware.

Fulch · 17th September 2010, 17:49

Mine is a VTR 1998 90 from factory.

It has

Raceland 4-2-1 Mani Wrapped
100 cell Sports cat
Uni Back Box
Viper forced induction

and on the last dyno in May it was 103.1

You have a lot more mods then me and only a little more BHP. I'm still waiting to put my decat back on and also my S1 Rallye inlet which I'm hoping to gain something from them.

Liam_ · 17th September 2010, 17:58

I wouldn't look into it too much, if it all tbh.

Azzybonjela · 17th September 2010, 17:59

my mate had a vtr, ragged to shit, 140,000 miles, 5 inch backbox, 65bhp !!!

Azzybonjela · 17th September 2010, 18:00

but on a plus side your car looks sik !!!

Mochachino · 17th September 2010, 18:03

Quote:

Originally Posted by Azzybonjela

my mate had a vtr, ragged to shit, 140,000 miles, 5 inch backbox, 65bhp !!!

i lolled

Gareth_R · 17th September 2010, 19:30

where do other peoples power usually peak? if the graph compares well to similar other cars then i wouldnt worry - the final figure depends on how they calculate the transmission losses as well

sexy_gt · 17th September 2010, 19:45

transmission not counted. i asked what it would be at the wheels. he said -20% ish
this is at the fly

yr51ocw · 17th September 2010, 19:57

stu - where in gy did you have it tested. I have always gone to boston to have power runs done.

And how much do they charge?

Gareth_R · 17th September 2010, 19:57

lol they take the wheel figure and apply transmission losses to get the fly figure

so they've got a wheel figure, either applied a standard 20% loss or used the overrun to calculate a 20% loss (sounds like they've just called it 20%). Then taken the wheel figure, divided by 80, times by 100, theres your 114 bhp

different places will apply a different figure, some will do a proper calculation on the overrun, iirc Northampton Motorsport showed mine as an 18bhp loss, cant remember how they calculated it.

So if you went somewhere else you could get a higher or lower figure depending on how the transmission losses are worked out (although this wont be the only factor obviously)