are these estimation charts accurate? it says to get a car weighing 850kg across quarter mile line in 11 seconds would take roughly 278 bhp!
http://www.ajdesigner.com/fl_horsepo...apsed_time.php
so scoffs car at 10.37 seconds would need to be around 350 bhp because will prob weigh more than a standard gt with the engine. thats crazy! that u guys think??
You need to be running a lot more than 350bhp to get that time
Take read of that to get you a better idea
https://www.rtoc.org/boards/showthread.php?t=14
is scoffs around 500-550 bhp ?
Maybe a little more nowOriginally Posted by BluntyR5GTT
haha bloody hell
That calc is a million miles away I'm afraid. The calc looks like it assumes RWD and @ the wheel power. You'd need maybe only 350hp with a light RWD car to go low 10's. In FWD its a different ball game. You have nothing like the level of grip so instead you have to make the difference up with power. You need to be looking at trap speeds, not ET's. An RWD car going low 10's with 350hp might do it at 130mph. FWD might need 140mph to do the same since it needs to make up for the relitively poor start. The FWD car has more power since it's able to trap at 140mph, but both cars complete the 1/4m in the same elapsed time.
This is a much better calculator. It still asumes RWD and @wheel power but you have a few more options to play with.
http://www.turbofast.com.au/Drag.html
Scoff
have you ever tried solid rear suspension to try and improve the start by reducing front end lift. It might be worth a try. Replace the rear damper with a metal bar just dont use it on the road!
RT
Hi Russell, yes, lots of planning and work went into my suspension last year. On the rear I run 1000lb/in coilovers with adjustable damping. I daren't run solid with those trap speeds, tracks can get a bit bumpy in the run-offs so that is as close as I dareIt can get pretty twitchy once you come off the throttle. I actually run competative 60's, in my case it was the gear synchro's letting me down. I was just trying to make a simple comparision for this thread
sounds pretty solid to me!
maybe you should invest in a parachute
Unfortunately, thats no joke!! MSA and/or the organisers of ESC require that you have a parachute if you are able to exceed 150mph on track. I hope to do that next year so it'll be interesting to see if they try to enforce it. ESC isn't quite as stringent as the HKS and some other series but it's heading that way.sounds pretty solid to me!
maybe you should invest in a parachute
Respect Chris. 150 in an R5 is getting very hairy!! You'll be wanting to extend the wheelbase before long! Is that against the rules?
Sure is, you need to have an OE monocoque. I already broke that rule a bit by butchering the front turrets and turreting the rear arches, but who cares
Shhhhhh, nobody need ever know.Sure is, you need to have an OE monocoque. I already broke that rule a bit by butchering the front turrets and turreting the rear arches, but who cares
lol, not to mention the non renault box`, im sure you have some interesting conversations due with the esc guys
we was wondering about the shoot aswell, as guy doesnt have one on his car, and im sure hes hit 150mph once or twice, i suppose we will see who rolls out with shoot fitted next year
Re the gearbox, ESC publish 2 sets of rules which differ to one and other when it comes to what gearbox types are acceptable. One set says, in short that the engine and gearbox need to be of european manufacture. The other set says that the gearbox needs to be "an OE casing". It is an OE casing, but from a different manufacturer. It's all BS and not what I signed up for. A lot of the current racers will leave the series if such silly rules are pressed home.
ahh ok, never knew that. i think for the hks, its says they must be from the same manufacturer as the body, i thought the same applied to esc. but yeah, i really cant see them enforcing that, the safety regs sure, but it would be silly to loose racers on technicalities like the stamp on the casings
So what bhp would bushys car be looks very impressive. 11.92 seconds with c1j and just a t25 and no nos.
have a read of this
https://www.rtoc.org/boards/showthread.php?t=14
I love that chart. What's a typical drivetrain loss on a jb3?
Maybe BHP or estimated BHP is something that can be added to the chart.
nah, just forget the times, mph never lies
Last edited by Rob@Backyardracing; 07-12-2010 at 19:03.
I believe he got 247bhp on a rollers when we all went to a rolling road back in the day
That tally's up with his terminals at the pod as he did do a 115mph run (not the 11.92 run though)
As been mentioned before its mph you want to look at to see how much power a car has on the strip
Last edited by Markey Mark (BD); 07-12-2010 at 18:03.
just looking at that thread above about the drag slip times and trap speed, it says that oyou need the trap speed to work out the bhp to eliminate the factor of poor starts etc. then at the bottom theres a thread to the calculator and it only asks for the elapsed time and weight to work out the bhp.it doesnt ask for the trap speed so is it still accurate?confused! appreciate any help thanks
You should have askesd how much power do you need for 112mph of trap, or whatever his was
The default option might be elapsed time but look closer, there are other options
lol still getin confused! so do you not use the trap speed to work out the bhp instead of the elapsed time? to eliminate the factor of bad starts wheel spinning etc? on the calculator you cant put the trap time in to get the bhp you can only put the weight and elapsed time in. you can find the trap speed from inputting the bhp and wieght but not other way round! or am i going miles wrong here? thanks
im just trying to work all this out because my friend has a subaru which weighs 1350 kg and his record quarter mile is 11.92 seconds trap speed of 128 and on the laptop road test it has 385 bhp at flywheel and 330 ish at wheels. just seeing if thats correct
Well, no you just input weight and power (wheel power) and see what the trap speed says. Tweek the power figure until the trap speed reads what you want it to.
128mph, are you sure ? If he's done that and he's sure it wasnt a fluke timing error then he's got a LOT more than 380hp ! 500hp @ wheels for a car that heavy would be required to go that sort of trap. Thats a lot of trap for a heavy 4wd car.
he has spent 16k on his car forged internals 6 speed rally box, ported head cam massive turbo, camshats. thats what he got at pod, hes never had it rolling road tested only on a laptop on the road when it was mapped. what would u say it is then power wise?
just double checked it was 11.98 and 126 mph trap subaru estate stripped out weighing 1350 kg
It's got to be in the order of 450hp @ the wheels I'd guess. What turbo and boost does he run, do you know ?
im sure there some vids on youtube of it ill ask him and also see what turbo and boost hes running.his gearbox cost a fortune i know that with short gears for acceleration .ill let u know
got the spec of my mates scooby
fully stripped interior weighs 1350 kg
forced performance td05 18g fully ported and polished internals
walbo 255 fuel pump
550cc injectors
stainless gt spec headers
full decat 3 inch straight through stainless
induction kit
front mount
v7 2002 bug eye sti 6 speed gearbox conversion
avcr boost controller running 1.5 bar of boost
running v power with 10% methanol mix
custom map
385 bhp 57 ftlb on laptop roller
best time 11.98 seconds quarter mile
http://www.youtube.com/watch?v=8Q5g0dDQmpc
this video is a drag against andy forests car running 550bhp
http://www.youtube.com/watch?v=7BAZDKe17dk
the blue car in this video is runing 500 bhp
http://www.youtube.com/watch?v=vmPVY...eature=related
the car is now in bits as hes building it to a new spec as follows
2.5 semi closed block over bored to 100mm
v9sti lightened and balanced crank
mahle 100 mm forged pistons and rods
12mm roger clarke oil pump and uprated water pump
1.6mm 3 layer stainless commitec head gaskets
v5 sti cylinder head and cams most agressive standard form you can get
underbucket shims
ported and polished heads
lightened cdf pulley set
reversed inlet manifold all ported and polished with ported throttle body reworked intercooler piping
lateral performance md321v turbo with internal wastegate built on garret ball bearing turbo rated 550-600 bhp
arp 6 plate sprung paddle clutch and lightened flywheel
2 x walbro 255 fuel pumps
with swirl pot
parallel fuel rails with modified 1000cc injectors
running 20 % methanol and 1.3 bar hoping for 530 bhp
Video's don't tell us a lot mate, I can't see any trap speeds in any of them. If he's going through @ 126mph then honestly, he's got more HP than he thinks. What's his average trap speed ? Was the 126mph a one off ?
seems odd that 126mph only gives an 11.98 with 4wd, that's more like a 116mph time
http://www.dragtimes.com/Subaru--Imp...l?resultpage=3
550cc injectors and 116mph maybe?
That would definately make more sense. At 1.5bar his 385hp seems much more likely but there's no way he'd have gone through at 126mph. 330hp @ wheels is going to do more like 113mph. Lets say he had that, or maybe a little bit more trap. 11.9 is much more likely. 126mph is good enough for a 10second pass in the right hands.
Trusty's lucky butterfly strikes again
i was gonna say that trap is way off for a 4wd car making 11.9x et`s. im guessing a windy day, and 11x traps on the other runs
he sed most of his times were 119 120 mph and his best 126 he sed the meth and v power mix make about 20 percent more power thats why trap speeds are higher
i like this thread as it makes my c1jlol
you sure hes injecting meth? or using it as "water" injection system?
i would of thought the car would need a fairly serious re-map to run meth, as its stoich is no-where near petrol`s....
He's doing very well in that case. 550cc injectors are pretty small, flat out they're good maybe only 400hp asuming he doesn't have astronomic rail pressure. Could he be tweeking the truth ? It would help a lot of we had some complete timing slips to look at.
i will see if he can produce slips, he doesnt normally make things up, he is using meth and a custom remap to run it, he has become very good at the starts on the quarter miles his dad has the new shape scooby running 450 hp and can get quicker starts in his than that
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