poor dyno result why?

[Jmac]

I am very much an Audi and VW man at heart but i tend to agree with the last statement, dyno car and horses then you need cubes without doubt, big arsed superchargers, big wide throated intakes that bark when they open, a mug of fuel every time the throat is open, the vehicles that spring to mind NEED to be strapped down on the dyno. Still goes to show like i mentioned earlier too many things in the mix and no 2 cars are the same.
Thats my opinion but hey i spend too much time fixing them rather than making them gain a couple of KW.
Cheers
Jmac

[h100vw]

Honestly, people really need to reconsider and rethink that dyno readings from the day wasnt 'perfect'. I too believe people need to stop reading so much into those dyno readouts.

Temperature and heatsoak are major factors that have already been pointed out.

Another issue that caused some concern for me is that all cars were being tested in 4th gear. This is sometimes an inaccurate indication as for instance Subaru STI's are dyno'ed in 3rd gear. Just a few too many of these other factors could have caused discrepencies should have been considered.

So people, dont feel down and just 'get over it'. Simpler test is to just put them side by side and go for it

I am sure they have a good reason for running Subarus in 3rd but I have never been to a rolling road where a run has been done in anything but 4th gear.

Generally, you wouldn't get any wheelspin and the engine accelerates at a rate which is easy to log. Seems sensible to use 4th IMO.

Gavin

[jasn78]

ok guys to a few of the last replys i wasnt actually wondering y mine was lowish i was more wondering y mine was lower than other polos dont care bout winning dyno days etc was more wondering what is up with my car.

[h100vw]

ok guys to a few of the last replys i wasnt actually wondering y mine was lowish i was more wondering y mine was lower than other polos dont care bout winning dyno days etc was more wondering what is up with my car.

Sorry chief, got caught up in the moment.

The upshot is that there are several reasons for your missing power. I would have a look at the MAF output with VAG-COM whilst on the road and go from there.

Gavin

[jasn78]

Sorry chief, got caught up in the moment.

The upshot is that there are several reasons for your missing power. I would have a look at the MAF output with VAG-COM whilst on the road and go from there.

Gavin

no worries gavin just trying to get pple back onto the orginal question

[Bug_racer]

I take it Im the only tuner on this forum at the moment?

Channel 115 should give you required vs actual boost . Log it and you can graph it . Post the results up here for analysis .

[shaneth]

Channel 115 should give you required vs actual boost . Log it and you can graph it . Post the results up here for analysis .

Thank you seb, thats a great heads up.

[Jmac]

Hey Jasn78 i too have been guilty of being caught in it too man sorry. Measured Value blocks and log mate sure does sound like you may have a boost leak or your MAF maybe showing signs of getting tired , you know how much crap this post would generate taking about chips and power - im over it quite frankly- anyway how you get to the bottom of it and like Seb says grab a log and match it on ross tech , they have graphs to match.
CHeers
Jmac

[velly_16v_cab]

I am sure they have a good reason for running Subarus in 3rd but I have never been to a rolling road where a run has been done in anything but 4th gear.

Generally, you wouldn't get any wheelspin and the engine accelerates at a rate which is easy to log. Seems sensible to use 4th IMO.

Gavin

as i have stated earlier in this thread, it doesnt matter what gear you run it, you SHOULD have the same result (within a few bhp)

Some people will run in 3rd to bring down the roller speed. so a run in 4th, car will be doing well over 100mph, a run 3rd and the rollers are only doing 80mph (sorry guy, i still havent got my head around km/ph lol )

And also as Gavin has said, less wheelspin in 4th too

[jasn78]

thanks jimmy and seb will get that all looked at

[LoriJarrod]

I am sure they have a good reason for running Subarus in 3rd but I have never been to a rolling road where a run has been done in anything but 4th gear.

Generally, you wouldn't get any wheelspin and the engine accelerates at a rate which is easy to log. Seems sensible to use 4th IMO.

Gavin

Sti gearboxes have a known strength failure in 4th gear. It's usually a protection strategy, especially when some of the cars do 100+ runs in a matter of months.

Similarily, 6spd Evo's have the same problem with 4th.

Lower gears will obviously produce higher tractive force readings, but as a tuning tool, there is no difference.

[Guy_H]

I take it Im the only tuner on this forum at the moment?

Channel 115 should give you required vs actual boost . Log it and you can graph it . Post the results up here for analysis .

I actually said that on page 2 of this thread if you go right back - now its up to 8 pages.

Car has a custom exhaust & custom intercooler & piping & to the best of my knowledge has never had the data checked

[Timbo]

jasn, as stated by others, it looks like something is amiss, most likely a boost leak, and by the age of your car, if it's not the TIP or other connections I'll put serious money on the dreaded turbo bolts loosening

This means that my car is putting out 60% more than stock. Probably explains things not holding that well together, guess the car wasn't engineered for this. Blown hoses (or clamps not holding) x 3 now, loose turbo bolts this is now a standard fix up about every 6-7000km...oh yeah forgot to mention blew the diff and gearbox and yep not a cheap repair bill.

From my experience I would only recommend the following mods - Chip/Suspension and brakes - spend the rest on driver training you will probably get more out of it. This is ofcourse unless you have reasonable size pockets.

From memory I read somewhere on this forum that the Polo GTI is not exactly suitable as a track car and if you want a Dyno car then one should probably start with cubic inches, take an SS Commodore strap on a supercharger and voila lots and lots of power.

Struth, ralph -- there's a lot of learning for us all in that lot! My heart goes out to you.

While generally I've never seen a horsepower I didn't like, there always problems when all of them arrive in the wrong place at the wrong time!

I reckon the Pog is a great little track car, with some work on its handling and brakes. You can probably even leave the engine alone, and do decent times, as FLOODY is showing, and a good LSD will make a difference, too. But it's never going to be a drag or dyno specialist, for all the reasons outlined above. I am more than happy with the power of mine, which is 135-138 Kw ATW depending on which dyno test you want to use. Getting that down on the track, making it useable and reliable are the bigger issues, and the turbo bolt issues are always in the back of my mind.

[FL00DY]

Thanks for that Timbo, oh and fair warning to you and Len, next Wakey outing I'll sporting some GIAC and coilover hotness

[Flaps]

Thanks for that Timbo, oh and fair warning to you and Len, next Wakey outing I'll sporting some GIAC and coilover hotness

Speaking of... When is everyone hitting the track next?