poor dyno result why?

[jasn78]

ok well all of us on here who was at the bris dyno day knows where this thread is heading but for everyone else.

Basically i am very dissappointed with what my polo pulled on the dyno "120kw" atw

what i cant understand is how i pulled less than pologti who is just running an apr flash where i have done the whole exhaust inc dump pipe and cat as well as all intake mods possible as well as fmic if someone can give me ideas of where i start looking that would be great.

[Flaps]

First thing I'd do is go and get it dyno'd somewhere else.

[Ben_GTI]

Hmm hard to tell exactly but I would start tracing back from the intake. Also depends on temperature too, was you're car hotter (intercooling wise i mean)?

Also I know it won't make much difference but if you babied your car it won't have as much stick.

[jasn78]

flaps really no point getting it dynoed somewhere else is there? as i am wanting to compare apples to apples not oranges (if i went to a different dyno i wouldnt know what some1 elses polo is putting out) whereas i do know what other polos are putting out on that one

and ben this polo definetley has not been babied

[VW GTI]

Rhys (pologti) had been there since 10am. Like 5 hours before his run... his engine would have been fresh as a daisy. I got their at 11 and went home for an hour at 1:30 (my g/f couldn't handle being there the whole day) and drove 10 minutes back and went straight on. I also only have 4500kms on my odometer as opposed to 30000.

I only pulled 120.9kw atw and I have the APR remap, APR downpipe and TIP (1.3 less than Rhys with just the remap). I also want to get it re-dynod under exact same conditions as another one with just the remap (and even yours jasn).

[jasn78]

tosspot i was there from 9 am and didnt go on till midday so unfortunatley i think my engine was also fresh as a daisy

[jasn78]

oh and i have 53000 kms on mine so i think engine is run in

[ranton-inc]

dude

line both cars up Side by side

see what happend in real world situation

if your dead even then the dyno is crap and wrong

if your better than even better


but really dynos are more or less (in my opinon) a means of diagnosis

What many people dont see is how the cart actually reads

how it translates in to usefull power.. where it produces power etc etc etc.

Ie a dyno wont really read actual drivability

some cars produce more power and evenly earlier on in the revrange thru the timing etc.

which in real world terms translates to a better option

unless you fancy driving it like a honda to get the max power out of the last few hundred RPM..

failing that..

ditch your exhaust and see what happens

also!!

another factor people never take in to account on dynos is TYRE PRESSURE MAG WHEEL SIZE etc

in my GTI.. i ran 130kw with my 16 inch wheels on..

put some 18" wheels on and ran 122kw


really to make a comparable dyno sheet you need to account for all variables.

ie use one set of mags and tyres on 4 different cars if you wish to compare them

but then you have to maintain atmospheric pressure and the current temperature as at the duration of the initial run!

if this doesnt make any sence sorry.. im half asleep.

[Eddy]

Hoyhoy.
There could be another factor that comes into play here & that is that there were people doing tricks with their fuel & just may be Jason 'got' tricked with his fuel.

[shaneth]

dude

line both cars up Side by side

see what happend in real world situation

if your dead even then the dyno is crap and wrong

if your better than even better


but really dynos are more or less (in my opinon) a means of diagnosis

What many people dont see is how the cart actually reads

how it translates in to usefull power.. where it produces power etc etc etc.

Ie a dyno wont really read actual drivability

some cars produce more power and evenly earlier on in the revrange thru the timing etc.

which in real world terms translates to a better option

unless you fancy driving it like a honda to get the max power out of the last few hundred RPM..

failing that..

ditch your exhaust and see what happens

also!!

another factor people never take in to account on dynos is TYRE PRESSURE MAG WHEEL SIZE etc

in my GTI.. i ran 130kw with my 16 inch wheels on..

put some 18" wheels on and ran 122kw


really to make a comparable dyno sheet you need to account for all variables.

ie use one set of mags and tyres on 4 different cars if you wish to compare them

but then you have to maintain atmospheric pressure and the current temperature as at the duration of the initial run!

if this doesnt make any sence sorry.. im half asleep.

Makes perfect sense well done.

But jason ive told you what i think..... and its even noticeable in the video.

[99gti]

Another thing to be binful of is since you have had all that extra work done - you may actualy have a boost leak. When was the last time you stuck it on vag-com to see if you have thrown a code. My money would be on that...

[shaneth]

Another thing to be binful of is since you have had all that extra work done - you may actualy have a boost leak. When was the last time you stuck it on vag-com to see if you have thrown a code. My money would be on that...

this is what i mentioned to him, there is a high pitch scream in the car when on boost....... as you can hear in dyno run video. would like to know what the cause is, may be something simple but does sound out of place.

[99gti]

Yeah - I noticed that also. I'd go over the clamps and do a double check of them. I only say this because I've had a similar problem with mine - once fixed she was boosting all hapily again .

[DaveMack]

This could well be the case (loose fittings). When I left my Pogo with Jimmy while I was in ENZ ... he went over the engine and found that my Forge TIP was basically very loosely held in place and all the clamps needed tightening. There were also other areas where mountings could be tightened and small engine maintenance 'stuff' (technical term) that I may have neglected.

Now I don't know how long it had been like that ... but I do know it performed markedly better when I got it back. So ... I guess what I'm saying Jason is ... how much prep work did you do before running on the dyno? How long since you'd lifted the bonnet and checked fittings etc?

Dave

[ranton-inc]

ok well all of us on here who was at the bris dyno day knows where this thread is heading but for everyone else.

Basically i am very dissappointed with what my polo pulled on the dyno "120kw" atw

what i cant understand is how i pulled less than pologti who is just running an apr flash where i have done the whole exhaust inc dump pipe and cat as well as all intake mods possible as well as fmic if someone can give me ideas of where i start looking that would be great.

Cat removal will gain you a few KW also..

but it completely unnecessary and probably very illegal..

give your car some ********..

strech her rings a bit..