Andy H Time Attack Car
26 August 2009, 06:18 PM
#2
Scooby Regular
Join Date: Jul 2005
Location: Running gt3542 rotated and loving the POWER!!!!!!!
Posts: 480
Likes: 0
Received 0 Likes
on
0 Posts
Looks good pal, I bet Andy's happy 
after all the agro he,s had. It looks like the To4z is doing the business at only 1.7bar
You can map mine again once I have my new turbo fitted which will be soon lol
Cheers Dougie
after all the agro he,s had. It looks like the To4z is doing the business at only 1.7barYou can map mine again once I have my new turbo fitted which will be soon lol
Cheers Dougie
26 August 2009, 06:38 PM
#3
Scooby Regular
iTrader: (8)
Join Date: Dec 2007
Location: manchester
Posts: 889
Likes: 0
Received 0 Likes
on
0 Posts
very nice ant 
roll on scoobyshootout (passenger please
). 500bhp at 1.5 bar awesome
have you bought a turbo yet dougie as i may have 1 for you .
roll on scoobyshootout (passenger please ). 500bhp at 1.5 bar awesome have you bought a turbo yet dougie as i may have 1 for you .
Last edited by shawy1976; 26 August 2009 at 06:39 PM.
26 August 2009, 07:05 PM
#4
Scooby Regular
Join Date: Jul 2005
Location: Running gt3542 rotated and loving the POWER!!!!!!!
Posts: 480
Likes: 0
Received 0 Likes
on
0 Posts
26 August 2009, 07:08 PM
#5
Scooby Regular
iTrader: (11)
Join Date: Nov 2007
Location: 2.1cdb, gt30 billet, syvecs
Posts: 1,081
Likes: 0
Received 3 Likes
on
2 Posts
it spikes at 1.7bar and holds onto 1.55bar, on v power only
i think that this is astonishing, just goes to show that the long hard work has paid off
edmy has put a lot of time and effort into this car , cant thank you enough ant
for all that are wondering why i am only running 1.55 bar, its because we were booked in on the dyno and we didnt have the time to wire the individual amplified coil packs in to the ecu so we are useing standard plug leads at the moment,when we asked for more boost the car developed a misfire, but i dont think i need any more boost yet any way, i need to get some time in the seat and use the car
big big big thanks to edmy for all his mapping skills
andy h
26 August 2009, 07:22 PM
#6
Scooby Regular
Thread Starter
Join Date: Aug 2009
Posts: 77
Likes: 0
Received 0 Likes
on
0 Posts
Its been a nightmare to say the least, but id say were not far off now, its been a long time coming, but now you can go and enjoy it.
120 Oct Race fuel, more boost, nah we dont need it.... (for the time being nehow)
Thanks for the kind comments
120 Oct Race fuel, more boost, nah we dont need it.... (for the time being nehow
)Thanks for the kind comments
26 August 2009, 07:31 PM
#7
Scooby Regular
This is the very turbo that AET advised me to change to, when I was investigating at making an easy 600bhp on VPower about 4 months ago. Looks like they were on the money.
Trending Topics
26 August 2009, 08:04 PM
#9
Scooby Newbie
Join Date: Aug 2004
Location: Northants
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
It's a good result, but the you need to look more closely at the graph.
The flywheel figures are overstated. The 2 lines of the bottom are the coastdown losses, the line with the big dip at the end is the actual measured losses, the line that is plotted through it there to avoid the big hump at the end. You can see that the curve fitted line doesn't carry the trend, so the flywheel figure is out by about 25-30hp or so.
The graph is from the older version of the dastek dyno software, but you should still be able to change the point where it fits the drivetrain losses curve through and get more applicable results.
However, the wheel power results are NOT affected by any of that, and at the point of peak torque the losses lines are pretty much on top of each other, so the peak torque will not have been affected.
The flywheel figures are overstated. The 2 lines of the bottom are the coastdown losses, the line with the big dip at the end is the actual measured losses, the line that is plotted through it there to avoid the big hump at the end. You can see that the curve fitted line doesn't carry the trend, so the flywheel figure is out by about 25-30hp or so.
The graph is from the older version of the dastek dyno software, but you should still be able to change the point where it fits the drivetrain losses curve through and get more applicable results.
However, the wheel power results are NOT affected by any of that, and at the point of peak torque the losses lines are pretty much on top of each other, so the peak torque will not have been affected.
26 August 2009, 08:23 PM
#13
Scooby Regular
iTrader: (8)
Join Date: Dec 2007
Location: manchester
Posts: 889
Likes: 0
Received 0 Likes
on
0 Posts
i just went from the boost on the right (bar ) to online with the bhp
i havea a gt3542 dougie with a 0.63 housing for sale £1000 brand new
26 August 2009, 08:28 PM
#14
Scooby Regular
Thread Starter
Join Date: Aug 2009
Posts: 77
Likes: 0
Received 0 Likes
on
0 Posts
It's a good result, but the you need to look more closely at the graph.
The flywheel figures are overstated. The 2 lines of the bottom are the coastdown losses, the line with the big dip at the end is the actual measured losses, the line that is plotted through it there to avoid the big hump at the end. You can see that the curve fitted line doesn't carry the trend, so the flywheel figure is out by about 25-30hp or so.
The graph is from the older version of the dastek dyno software, but you should still be able to change the point where it fits the drivetrain losses curve through and get more applicable results.
However, the wheel power results are NOT affected by any of that, and at the point of peak torque the losses lines are pretty much on top of each other, so the peak torque will not have been affected.
The flywheel figures are overstated. The 2 lines of the bottom are the coastdown losses, the line with the big dip at the end is the actual measured losses, the line that is plotted through it there to avoid the big hump at the end. You can see that the curve fitted line doesn't carry the trend, so the flywheel figure is out by about 25-30hp or so.
The graph is from the older version of the dastek dyno software, but you should still be able to change the point where it fits the drivetrain losses curve through and get more applicable results.
However, the wheel power results are NOT affected by any of that, and at the point of peak torque the losses lines are pretty much on top of each other, so the peak torque will not have been affected.
if the car was around 25-30 bhp down that would be less than 10% loss....523 + 9% = 570523 @ wheels + a very conservative 4wd 15% drivetrain loss = 601....
ant
26 August 2009, 08:39 PM
#17
Scooby Newbie
Join Date: Aug 2004
Location: Northants
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
Odd to you perhaps, but nonetheless a fact. The losses are much more to do with the wheel speed than transmitted torque or power. You can see this easily on a dastek dyno, just re run the car in another gear. If you run the car in 5th gear you will generate much higher losses on the dastek dyno, and I would expect the flywheel figure to be slightly lower due to a longer run time with more time for the intercooler to heat up. Also you should look at the shape of the losses line, it's a curve suggesting the losses are not a fixed percentage anyway. If you plot a line through your coastdown loss graph, you will see the losses at 7000 are more like 75hp (depending on how you read the graph) ontop of 500hp at the wheels giving a 13.5% loss, if you were to run the car to 8000rpm you would see that percentage figure grow to something more like your accustomed to.
There is no easy way to get around this, although rolling off the throttle more gently at the end of the pull gives a little more time for the residual magnetic eddy currents to dissipate in the retarder. It's these eddy currents that cause the brake to still be effective even after the electric current through the exciter coils has been removed, and when the brake is still working a little, it slows the drivetrain down unnaturally fast, giving that odd hump in the the coastdown losses line. Its less of a problem in lower powered cars because you're not working the brake so hard just before you end the run.
There is no easy way to get around this, although rolling off the throttle more gently at the end of the pull gives a little more time for the residual magnetic eddy currents to dissipate in the retarder. It's these eddy currents that cause the brake to still be effective even after the electric current through the exciter coils has been removed, and when the brake is still working a little, it slows the drivetrain down unnaturally fast, giving that odd hump in the the coastdown losses line. Its less of a problem in lower powered cars because you're not working the brake so hard just before you end the run.
26 August 2009, 08:55 PM
#20
27 August 2009, 08:45 AM
#27
Drag it!
iTrader: (1)
Join Date: Jun 2002
Location: Flame grilled Wagon anyone?
Posts: 9,866
Likes: 0
Received 0 Likes
on
0 Posts
Nice graph Andy. What cam timing did you end up with in the end?
I see its starting to dip off slightly between 7 and 7.5, do you think thats cam timing/turbo/heads that is causing that? or just that its a 2.5?
What kind of times are you expecting from it at Scooby Shoot Out?
I see its starting to dip off slightly between 7 and 7.5, do you think thats cam timing/turbo/heads that is causing that? or just that its a 2.5?
What kind of times are you expecting from it at Scooby Shoot Out?
27 August 2009, 10:15 AM
#28
Scooby Newbie
Join Date: Aug 2004
Location: Northants
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
But you don't have 603.6hp at the flywheel, and any educated person can see that purely by looking at your own graph.
AFAIK the engine from the Gobstopper hasn't been on an engine dyno and rolling road or hub dyno to give any acurate drivetrain losses. Last dynoed on a hub dyno which does give higher wheel figures than a dastek due to no tyre losses.
AFAIK the engine from the Gobstopper hasn't been on an engine dyno and rolling road or hub dyno to give any acurate drivetrain losses. Last dynoed on a hub dyno which does give higher wheel figures than a dastek due to no tyre losses.
27 August 2009, 12:36 PM
#29
Scooby Newbie
Join Date: Aug 2009
Posts: 11
Likes: 0
Received 0 Likes
on
0 Posts
THE CAR CLEARLY MAKES 523 @ THE WHEELS, REGARDLESS.
ZEB YOU ARE CLEARLY NOT HAPPY AT THIS CAR MAKING THESE FIGURES AT THIS BOOST LEVEL AND ITS OBVIOUS YOU ARE SOMEONE ELSE, UNTIL LAST NIGHT 4 POSTS IN 5 YEARS, WTF!?
ZEB YOU ARE CLEARLY NOT HAPPY AT THIS CAR MAKING THESE FIGURES AT THIS BOOST LEVEL AND ITS OBVIOUS YOU ARE SOMEONE ELSE, UNTIL LAST NIGHT 4 POSTS IN 5 YEARS, WTF!?
27 August 2009, 12:57 PM
#30
Scooby Newbie
Join Date: Aug 2004
Location: Northants
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
I don't feel anything about the figures.
However I am happy that Andy has made serious progress with his car and it seems this isn't always the case, in the past his good results seem to be followed by an engine problem that isn't his fault.
What i do feel strongly about is fact, and in this case the OPs own graph shows an error in measurement, so long as you know what you're looking at though it's fine. I am sure Andy will be keen to know the results of any changes made, but that would be difficult to do if he is not able to interpret the dyno plots correctly.
And obviously I set this account up 5 years ago waiting for this very thread.
However I am happy that Andy has made serious progress with his car and it seems this isn't always the case, in the past his good results seem to be followed by an engine problem that isn't his fault.
What i do feel strongly about is fact, and in this case the OPs own graph shows an error in measurement, so long as you know what you're looking at though it's fine. I am sure Andy will be keen to know the results of any changes made, but that would be difficult to do if he is not able to interpret the dyno plots correctly.
And obviously I set this account up 5 years ago waiting for this very thread.