Quite..... What's Shoot_44 on a DD dyno - one of the 4wd modes?
Edit: standard dyno power run setting for 4wd turbo cars apparently.
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Highest BHP 1.8T in the UK???
- Thread starter IbizaAlex
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Quite..... What's Shoot_44 on a DD dyno - one of the 4wd modes?
Edit: standard dyno power run setting for 4wd turbo cars apparently.
JNL
Guest
It's a bit deceiving on the power figures as it is a Dyno Dynamics. They use a standard across the board 30% transmission loss for 4WD's. Which results in exceptionally high transmission losses to other dyno's. Ironically what you'll find is that the calculated flywheel figure is very accurate and the whp is incredibly low compared to other dyno's.
We use Surrey Rolling Roads for two specific reasons
1) Charlie straps the cars downwards meaning no wheelspin during mapping sessions when you come on boost. Which is very important on a car that is too powerful to map on the road safely.
2) It's known as the Heartbreaker dyno as he has his calibrations set very pessimistically. This means whatever we produce there it will automatically be more elsewhere.
Surrey Rolling Roads is one of two dyno's I know of that you can put a production car on and read factory flywheel figures give or take a couple of BHP. The other being a Cartec dyno at MRC Tuning.
After we finish the final map which will be when we have the new hubs, cv's, driveshafts and gearbox (yes so far on just 15 runs broken 2 custom uprated driveshafts, sheared the noses of two cv joints and stripped the teeth of the 4th gear lay gear on two seperate freshly build strengthened box's) we are going on a roadtrip.
First we take the DD figures. Then drive to Banbury and take the Cartec figures which will give approximately 10-14% more wheel horse power but approx the same flywheel as it measures coast down. And then upto awesome gti in Manchester to put her on a dynojet inertia dyno so we have a comparison to the US figures.
As a reference though from experience on other cars that we have tested this way if the DD reads 750BHP and 606AWHP then the Cartec from experience will read 760BHP and 660AWHP and then the dynojet will read 785BHP and 750AWHP.
This is because an inertia dyno can't load the car up properly resulting in flat torque curves instead of one that drops of. The end result being that HP being a mathematical calculation of Torque vs RPM they always read incredibly high top end figures. This is so recognised in Europe as an issue with US figures that some of the Scandinavians will Joke and say if a Dynojet reads 750AWHP then you have around 720BHP on a real dyno.
hth JP
JNL
Guest
...........Should...........
There is a calibration factor that adjusts for atmospheric pressure and temperature it is this calibration factor that different dyno operators mess about with. To the extend that in the 2008 SRS North South rolling road day we had one guy that rand his car up in the North of England on a DD, drove down straight away to the Surrey Rolling Roads one. (4-5hr journey). Showed his plot to Charlie who laughed at the correction factors, and the same car made 70hp less.
In 2009 they used a different DD up north and this time round one of the people that made the 4-5hr journey was within 4hp as they ran the same correction factors.
JNL
Guest
get a decent gearset
dog box will be a superb addition
We're on the case at the moment working out ratios, but it looks like a 2-3months lead time so we may temporarily chuck a stock box in just so we can make inters and run it on the low power 1.5bar map.
Do you know anyone thats tried the sequential shift conversion from SQS? Looks interesting just wondering how driveable it is?
DD rollers are just as open to fudge figures as any...
there is a lot or PR hype people have been suckered into, believing they are accurate and heartbreaker.. aka just plain inaccurate at times
there is a lot or PR hype people have been suckered into, believing they are accurate and heartbreaker.. aka just plain inaccurate at times
JNL
Guest
^^^^ yep that's why we stick to people we know. Could you get RobT to contact me? As I don't have anyway of pm'ing people on this forum?!?!?
ive just realised i was up against this at pod just found a video of it.http://www.youtube.com/watch?v=9rqPLsfX3yI&NR=1
SQS dogbox..
you know you want to
Is that what you run Bill? Do you know much about the syncro version they do?
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