Car Climbing Out Of The Dyno - Advice?

[_Ryan_]

if found the 595rs to be a semi semi (ie not as soft as r888 or 555 etc) so you should be ok, ive dynoed a few with the 595rs without drama, mind you they were only high 200 rwkw cars.

Those and the KU36 are a street compound in a semi pattern not an R compound(Like the RE55), or an I mistaken?

[CEF11E]

if found the 595rs to be a semi semi (ie not as soft as r888 or 555 etc) so you should be ok, ive dynoed a few with the 595rs without drama, mind you they were only high 200 rwkw cars.

these were the tyres I was using. well actually 595rs-r's

[TiTAN]

it should be somewhere around 350+kw at the rears which is the bit that concerns me (RB30 + GT3582 0.82)

Those and the KU36 are a street compound in a semi pattern not an R compound(Like the RE55), or an I mistaken?

They have a tread wear rating around 150 unlike the RE55's which are between 50-100 from memory

[NickR33]

yep the KU36 and 595rs-r and RT615 are all in the same basket... pretty aggro tread pattern but no where near as soft as full semis... all around 180-200 tread wear rating

I've just had a set of the KU36 put on my car... I wouldn't think they will affect the dyno at all... they drive pretty much like normal road tyres just have a stiffer sidewall, fatter shoulder and bigger tread blocks

I dunno what's up with your car but I would be looking for a second opinion

[N I B]

480rwkw... yes!

480rwhp... no!

unless it was stripped to a bare shell and even then it would probably be too heavy

Defiantly 480rwhp and full body totally as driven and as it sits at my house for sale right now. So many shops give dodgy power figures and people have become so brainwashed that they believe these silly figures. Many high powered GTRs are Dyno queens with very poor power curves with late boost and falling off boost between gears etc.

This thing even does over 500ks to a tank and is very nice to drive with a simple smart package that now its sorted works.

[r33cruiser]

Defiantly 480rwhp and full body totally as driven and as it sits at my house for sale right now. So many shops give dodgy power figures and people have become so brainwashed that they believe these silly figures. Many high powered GTRs are Dyno queens with very poor power curves with late boost and falling off boost between gears etc.

This thing even does over 500ks to a tank and is very nice to drive with a simple smart package that now its sorted works.

sold haha.

I had mine tuned ages ago and at the time it only had 250ish kw, but it was strapped down with NUMEROUS straps. Anyone who has been to the PITS knows the top notch setup matty has going on there.

Pluss I would think that it would have to be strapped down WELL due to OH&S requirements. I dont care who you are, not strapping a car down, or just using 1 strap is completely negligent.

Edited October 2, 2009 by r33cruiser

[R31Nismoid]

480rwkw... yes!

480rwhp... no!

unless it was stripped to a bare shell and even then it would probably be too heavy

lol 480rwkw to run 134mph?

Maybe have a suck on your own crack pipe.

[SimonR32]

lol 480rwkw to run 134mph?

Maybe have a suck on your own crack pipe.

i said you could run 134mph with 480rwkw... doesnt mean it would be a good run!

480rwhp on the other hand is bending physics

[N I B]

Well I have the Time cards and I tuned it myself. Ive been accused of over rating Power graphs but under rating is a first.

I have racecars at every meeting at Wanneroo beating similar cars that claim sometimes 100s of HP more than my cars so these huge power claims make me laugh.

Ive even seen GTRs with 800rwhp power graphs run 11.9s etc so forget Dyno sheets and rely on time cards.

Edited October 2, 2009 by N I B

[MBS206]

i said you could run 134mph with 480rwkw... doesnt mean it would be a good run!

480rwhp on the other hand is bending physics

No it's not... Head out to WSID...

Maybe a car making 480RWHP at 9000RPM it is...

But if it's pushing 480RWHP at 4500RPM... You're making double the torque... IE, it'll accelerate twice as fast...

Edit: As to that video of the car "climbing" out of the dyno... I wouldn't even call that movement if you'd seen how mine used to walk around when coming on boost until we worked out how to strap it on perfectly...

Car used to walk 1.5Ft sideways, and if it didn't go sideways, it'd climb OVER the front of the roller and nearly touch the front of the dyno... Oh, and the whole time it's doing this it's filling the work shop with tyre smoke...

Took us a bit to work it out, but lower the ramp rate, and we actually LOOSENED one of the straps to stop it wheel spinning so much... Still shredded the tyres though in the end... And they were just normal streets!

[DCIEVE]

No it's not... Head out to WSID...

Maybe a car making 480RWHP at 9000RPM it is...

But if it's pushing 480RWHP at 4500RPM... You're making double the torque... IE, it'll accelerate twice as fast...

You developing double the torque in order to make the power at that speed but will you accelerate twice as fast?

Edited October 2, 2009 by DCIEVE

[N I B]

Never claimed outrageous power numbers and nothing like I see posted these days. I did once claim very high 400rwkw from a Skyline and it did run well over 140mph over the 1/4 in full street trim to back it up.

Edited October 2, 2009 by N I B

[Ruffels]

ive only dyno'd a few cars... but in my experience, when i strap them down (using dyno dynamics dyno) that this will not stop them from jumping off the dyno.. the front wheels being choc'd will more then likely .. the strapping down with snatch straps via the lower control arms to the traction bar only achieves better downforce on the rollers for more accurate figures and hopefully preventing wheelspin..

i get alot of people who get scared of thier cars jumping off the dyno and hitting the brick wall 8m infront of the dyno haha... does no one understand the theory of momentum ... a car has none when on the dyno... its not going far if it jumps off, especially when choc'd and the operator backing off.

Edited October 2, 2009 by Ruffels

[Swiper the Fox]

Never claimed outrageous power numbers and nothing like I see posted these days. I did once claim very high 400rwkw from a Skyline and it did run well over 140mph over the 1/4 in full street trim to back it up.

what am i doing wrong?...ive got a r32 running around 145 MPH weighing 1571kg...its got over 600kw at the treads.

[fatz]

what am i doing wrong?...ive got a r32 running around 145 MPH weighing 1571kg...its got over 600kw at the treads.

probably leaving it in 3rd

[N I B]

In 2004 ND4SPD was 500rwkw(683rwhp) on My Dyno and ran over 140mph on normal road Dunlops. ET was quite poor at high 10s but Speed proves the power.

I think people like having unrealistic power figures on their cars and are happy to believe they do even if they cant run the MPH they should.

[Swiper the Fox]

http://www.dragsource.com/index.php?navsel...mp;calctoview=4

checks out here...

3457lb

best et 9.45

best MPH 145

best dyno figure 820hp

the result is only 2.5hp off

its made between 810 and 820 on two different dyno's in two different cities with a very skilled dyno operator.

NIB the car you are refering to is a freak (not ND4SPD the other one)...actually something has come to mind...what final drive is it using? ND4SPD's MPH is about right for the power as i ran 139.6 holding 3rd with 500KW at the treads.

Fatz the 145MPH was using 4 gears...hehe

Edited October 3, 2009 by DiRTgarage

[N I B]

Engine HP maybe not rear wheel. The figures used for these Power/weight v Speed calculators are all based on USA Superflow type dynos.

The car I was talking about backed up its power within 2rwhp at a big car show. 500rwkw is just short of 800 at the flywheel and returned 143 and a bit MPH.

Big George Toyota is around 1440kg and ran 150 and low 9s with 600rwhp, Glen Robinsons Ford is 1275KGs and ran 8.8@ 152mph with 820 flywheel on a Superflow engine dyno.

[Swiper the Fox]

Engine HP maybe not rear wheel. The figures used for these Power/weight v Speed calculators are all based on USA Superflow type dynos.

The car I was talking about backed up its power within 2rwhp at a big car show. 500rwkw is just short of 800 at the flywheel and returned 143 and a bit MPH.

Big George Toyota is around 1440kg and ran 150 and low 9s with 600rwhp, Glen Robinsons Ford is 1275KGs and ran 8.8@ 152mph with 820 flywheel on a Superflow engine dyno.

they refer in the text below the calculator to being within 2hp of a dynojet dyno...i.e. a chassis dyno

http://www.dynojet.com/automotive_dyno/default.aspx

[PM-R33]

what am i doing wrong?...ive got a r32 running around 145 MPH weighing 1571kg...its got over 600kw at the treads.

Thats with you in the car and the fuel cell filled right? I thought a stripped R32 drag GTR would weigh less than that... I suppose the roll cage adds a bit of weight back?

I've weighed mine with me in the car and fuel (can't remember exactly how much fuel there was, probably half a tank) and it was 1500kg on the dot. Mates aero top supra was 1620kg with him and fuel in it for reference.

Edited October 3, 2009 by PM-R33