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Author Subject: Run on dyno - down on power.
jammapic

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Location: Manchester

Registered: 11 Jun 2010

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Post #1
Hi,

So got round to running the GTI-6 on the dyno yesterday, and found it's pretty down on power. It ran 149.9hp and 140lbft of torque and while the power was fine up to about 5000rpm, after that it dropped off a bit and got flat.

I've attached two graphs. 1 with the power and torque, 1 with the wheel power and AFR, wondered if there's any common stuff to look at? I know the XUD's inside out, but don't really know my way around an GTi lump.

I've changed the oil as I thought it was wise, but I haven't got round to doing the plugs / filters etc as it's just been too bloody cold.

Power vs Torque




Wheel power vs AFR



Any ideas?

JP

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Posted 4th Jun 2014 at 08:37
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #2
AFR get checked?

throttle cable checked?

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Posted 5th Feb 2012 at 15:03
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spiky

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Location: Cardiff

Registered: 13 Oct 2006

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Post #3
exhaust collasped/collasping?

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Posted 5th Feb 2012 at 15:11
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welshpug!

Capt Pedantic

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Post #4
hmm, afr's look ok afaik, torque and peak power exactly where they should be, which gear was it done in?

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Posted 5th Feb 2012 at 15:18
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gnrlee Forum Admin

Location: Leeds

Registered: 20 Aug 2005

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Post #5
barhh if I'd have know another 6 was going I'd have made more of an effort,..
and get a better idea if it's you that's down or if it's the Dyno it's self?

but if your convinced it's your car then yeah as said check you getting full travel on you throttle cable and have a good check around do a full service fuel filter sparks etc
you get the jist maybe some 10k boot (flush all the crap out)
do a compression test see if you're piston chambers are holding a good PSi as long as all Chambers are giving the same PSI reading they should be fine,..

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Posted 5th Feb 2012 at 15:19
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fatlapit

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Location: STOCKSFIELD

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Post #6
lots of engine wear

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Posted 5th Feb 2012 at 15:19
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atterz

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Location: Stafford

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Post #7
On a car thats done 60k and has never been ragged? Dont assume.

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owain wrote:
A GTI-6 with a good dashboard and the seats down can outsprint an E46 M3 in July.
Posted 5th Feb 2012 at 15:28
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fatlapit

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Post #8
with full regugular oil changes??? always warmed up

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Posted 5th Feb 2012 at 15:52
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fatlapit

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Post #9
origional dash?? engine??? decent air filter in it??? as said before the afr is looking good so it may have to be something mechanical???

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Posted 5th Feb 2012 at 15:54
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davedgti6

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Post #10
Timing slightly out? , I would pin up the bottom pulley (if you know it has not slipped) and check pins in the camshaft pulleys slide in nicely, if not that could cost you some power

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Posted 5th Feb 2012 at 18:09
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atterz

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Post #11
Agreed that inlet/exhaust cam timing may be slightly out, depends on who does the belt. But it wouldnt rob 17Bhp surely? This pulls as well as my Rallye, feels less punchy in the mid range but is still just as quick.

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owain wrote:
A GTI-6 with a good dashboard and the seats down can outsprint an E46 M3 in July.
Posted 5th Feb 2012 at 18:51
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jammapic

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Post #12
64k original, totally stock, original paper filter etc.

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Posted 5th Feb 2012 at 20:30
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adam b

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Post #13
Check timing, fuel filter and cat are ok. Standard proper Peugeot exhaust?

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Posted 5th Feb 2012 at 22:04
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allanallen

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Post #14
Agree with Adam, check timing then the complete exhaust system.

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Posted 5th Feb 2012 at 22:41
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atterz

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Post #15
How is it possible to know if a Cat has collapsed?

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owain wrote:
A GTI-6 with a good dashboard and the seats down can outsprint an E46 M3 in July.
Posted 6th Feb 2012 at 00:35
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owain

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Post #16
atterz wrote:
How is it possible to know if a Cat has collapsed?


It will have fallen over and there will often be hairballs littered around the floor.

Seriously, you're going about this all wrong. Whenever I've seen people come back from dyno days with less than they hoped for, it's all about blaming the dyno, or at least the staff who ran it. Things like:

  • The dyno looked really old
  • The guy running the dyno looked really old
  • I didn't see a certificate to say it'd been calibrated
  • It was an unnaturally warm February day
  • My car was too powerful so the dyno couldn't give an accurate reading

    • Only once in my life have I managed to sit through a full dyno day, and some guy with a calculator was adding on 25% to everyone's power to account for their FWD transmission losses. "OMG, your £17 induction kit has given you 25hp! You must be well chuffed!". Never again.

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    Posted 6th Feb 2012 at 07:55
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    monkeyman

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    Post #17
    What petrol were you using? Premium unleaded does make a difference, plus a new air filter and plugs should help out. How does it feel when you drive it, does it feel slow? Also how is it usually driven, short trips or regular blasts, engine may just need a bit of a workout.

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    Posted 6th Feb 2012 at 13:59
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    jammapic

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    Post #18
    Owain - I've not said the dyno was out? Infact, I think it's the most accurate I've ever used... a mate of mine runs it.

    Show me where I said the dyno was wrong?

    I KNOW the car is down on power, I'm trying to gauge where I should be looking.

    I'll put some decent fuel in it, change the plugs etc etc and run it up next time I go and see him.

    JP

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    Posted 6th Feb 2012 at 18:54
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    owain

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    Post #19
    owain wrote:
    Seriously, you're going about this all wrong

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    Posted 6th Feb 2012 at 20:42
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    jammapic

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    Post #20
    Why am I wrong?

    I'm not saying the dyno was inaccurate at all. Far from it, I'm saying the car is down on power and I'm looking for some advice.... if you can't offer any then that's fine.

    JP

    ________________________________________

    HDI Engine Tuning / Remapping Services - https://www.facebook.com/dervtech

    306 GTi-6 Track Car - 200+ hp all N/A!
    306 DTurbo Track beasty - 209.9hp - RIP
    Posted 6th Feb 2012 at 22:13
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    owain

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    Post #21
    You misunderstand me, I never said that's what *you* were doing, I said it's what everyone *normally* does. Never mind.

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    Posted 7th Feb 2012 at 08:01
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    adam b

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    Post #22
    Owain in rare funny fail shocker...

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    Posted 7th Feb 2012 at 09:21
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    welshpug!

    Capt Pedantic

    Location: Bigend, Wales.

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    Post #23
    jammapic wrote:
    I'm not saying the dyno was inaccurate at all.


    I would, its a dyno after all LOL its an accurate guesstimate at best, were there any other comparable vehicles there at the same time? if not I wouldn't worry about it.

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    Posted 7th Feb 2012 at 09:46
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    jammapic

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    Post #24
    Don't worry, I will ask on other forums.

    Thanks for your help.

    oh and FYI - yes, other standard cars there running standard power....

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    306 GTi-6 Track Car - 200+ hp all N/A!
    306 DTurbo Track beasty - 209.9hp - RIP
    Posted 7th Feb 2012 at 10:10
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    owain

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    Post #25
    Eh? You've got a page of useful answers here, why you getting so menstrual?

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    Posted 7th Feb 2012 at 10:12
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