Yeh - looks like American horsepower - about 15-20% higher than ours.
Printable View
Yeh - looks like American horsepower - about 15-20% higher than ours.
Hi Guys,
I understand the 1/4 mile concept now, I really didn't understand it before, but do now. And it seems an ok way to guage the power of a vehicle.
But when you convert fwhp to rwhp, it is only a guess, as auto's lose more than manuals through the transmission. So what calculation are you using there?
It is all guess work, dyno's show peak power, but the 1/4 mile shows actual power. Welll it is good to know there is a method like this out there to work from.
Yeah I'm not so sure 1/4 mile MPH shows power properly either. On the same day, same car about 20 runs admittedly on street tyres, and for each 0.1 sec I cut off my 60 foot time, my MPH increased at the end by 1 MPH, same car same day varied about 5 or 6 mph worst to best.Quote:
Originally Posted by dazzak75
If you have drag radials and no wheel spin then yeah MPH might equal power.
My cam only VE on that one came out at just under 600rwhp..... :rofl: :lol:
That calculator is total crap! Moroso is much better
haha my cam only ls1 cam out at 450 something and a 12.4, way off drop the rwhp by 55 and the et buy 0.7 and it would be right, only a small marging out by the looks hahaha
Only way to confirm real hp is something like the Thunder Mile. That removes the launch, gearchanges and wheelspin as a factor. I had Mark from Guernsey a customer of mine go 250kph in a stock cammed VY Ute in the 1mile challenge in England.
Steve how would that work with mine, i ran over 1km and ran 260kph and still in 4th gear, is there anyway to work that out?Quote:
Originally Posted by oztrack
Has the new throttle blade been received & installed yet ?? Tune finished ??
I'm sure i'm not the only 1 awaiting an update .
Troy
Yeah your a confirmed tool.Quote:
Originally Posted by DR-vyss-108
sorry, but i dont know about this stuff, there has been alot of shit going on with my car and its apparent power outputQuote:
Originally Posted by Blown 540
Here is an update for you, have ben busy.
New TB blde has not turned up, so got the other one welded up and re-installed, it happily idles at 1000rpm now, I don't know if it will idle any lower. Changed the catch can set up and it seems to be better, am going to get braided lines for that also.
It went back on the dyno, not what we were hoping for, dyno read out 393.9rwkw, cam peaks and starts losing power at about 6100. So it was then off to the 1/4 mile.
After a couple of runs, no burnouts, as the rear tyres are new, and didn't have anything elase to use. I recorded a 12.6 @ 120mph, thent he oil temps were too high and had to call it a night.
Looking at getting my headers ceramic coated, oil cooler, 160F thermostat, and have been looking around at cams, have been recommended a different one, everyone ws saying go bigger, well here is what I have been recommended from a cam guy in the states.
Cam recommendation: Holden VE Ute w/forged 11.8:1 454 short block, 70cc Higgins ported LSX LS7 heads, FAST 102 intake, 102mm TB, manual trans, 3.7 gear, 1 7/8” headers with dual cats, 7000 rpm shift point, 7300 rpm rev limiter.
251/263 .670”/.670” 112LSA +3 advance (with 1.8 ratio rockers)
Comp HUC/HUC lobes 54-000-11 3 bolt cam core
13053R/13056R HR112LSA +3 advance (109 installed intake centerline)
Cam Valve Events 0.006 0.050 0.200
Intake Duration - ID 306 251 169 13053R HUC lobe .372"
Exhaust Duration - ED 318 263 181 13056R HUC lobe .372"
Lobe Center Angle - LSA 112 112 112
Intake Centerline - ICL 109 109 109
Intake Valve opens - IVO 44 16.5 -24.5 BTDC (- indicates ATDC)
Intake Valve closes - IVC 82 54.5 13.5 ABDC
Exhaust Valve Opens - EVO 94 66.5 25.5 BBDC
Exhaust Valve Closes - EVC 44 16.5 -24.5 ATDC (- indicates BTDC)
Exhaust Centerline - ECL 115 115 115
Overlap 88 33 -49 degrees
What are your thoughts on that cam?
Will be going through all the changes either at the end of next month or the month after
Now your talking, that's definitely a step in the right direction.
Well I have had enough of trying to decide what to and what not to use as a cam, so I have contacted Oztrack to come up with a design that will suit, I don't care what it is that has to be changed, but want it performing like it has the capabilities to.
So until then, nothing is getting changed or done until we come up with a package that will make it all come together. So there could be a bit of changing this, changing that, I just want it right and not have to keep changing things here and there,
Here is an update to the engine,
It is currently oin having a new cam installed, it is bigger than the current cam that is in it, and has been spec'd and ground in the states.
It is also having roller rockers installed, 2" headers I had made for me, having the clutch inspected, getting compression accurately measured, checking oil pump also to make sure it is High Volume one, then it goes back into tuning mode and running on the dyno to make sure we get the tune pretty accurate also.
I will keep you posted as to the outcome of the upgrades.
its most likely the cam,but could be anything, lifter pump up, lifter bleed down, lobe choice, valve weight, geometry, oil pressure, lifter choice and preload is all critical or u get bleed down and hp is gone....if it bleeds down you loose lift it it pumps up air passes right through, u need to get some good engine dyno hrs on it to see whats up, we went 11.00@ 127.5 mph VE A6 427 first pass but was due to the fuel system starving around 60-330 spluttered a few times then took off and picked up over 30 mph in deepend so we expect,all fixed now, rain is stopping us atm. 130 mph traps from a 427 with all the right bits and combination and an A6 which I have spent a lot of time on setting up to work as it needed quite a bit. This engine made 706hp with single plane and 4% loss with LS7 manifold so on paper it had 650 moroso hp although it the real world from the track data it has 10.5-10.6 at 130 mph 670/680 moroso hp. Thats what you need to get 125 plus and just goes to show what 'real' hp you need to get there as the track won't lie nor does a set of competition scales like we use.