Antnicuk
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| posted on 20/4/09 at 09:16 PM |
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this should do it!
get me in to the 10's that is! I am hoping this will see 600 bhp per ton
Just got to squeeze it in here now!
[Edited on 20-4-09 by Antnicuk]
600 BHP per ton, Stylus Brought back from the dead! Turbo Rotary Powered!
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omega0684
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| posted on 20/4/09 at 09:26 PM |
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WOW thats a big garrett, dare we ask how much? 
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clairetoo
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| posted on 20/4/09 at 09:27 PM |
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Thats MENTAL
Its cuz I is blond , innit
Claire xx
Will weld for food......
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Xtreme Kermit
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| posted on 20/4/09 at 09:32 PM |
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Obviously size matters
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Antnicuk
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| posted on 20/4/09 at 09:33 PM |
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its a TO4E which is small in RX7 terms but big compared to your average boinger unit.
Its locost, as is everything...... £185 ebay special. It seems very good with no play so figers crossed. It came as a whole kit with a
manifold/filter etc but the manifold will need modifying (read.... remaking)
then back to the dyno for a remap!
600 BHP per ton, Stylus Brought back from the dead! Turbo Rotary Powered!
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bimbleuk
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| posted on 21/4/09 at 09:35 AM |
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Just for interest what's you current car weight and peak BHP/Torque @which RPM.
I've been using Cartest to do some simulations on my Striker to get an idea of what BHP to aim for. That's if you actually care about 1/4
mile times and BHP per ton of course :p
I reckon in my 565kg Striker I'll need to get 320BHP to get in the 11s and achieve a nice 500BHP per ton (inc driver). So to get in the 10s
would be an achievement even for a light car.
At least the Stylus has better aerodynamics and loads more torque from the turbo. I have 270BHP currently and lots more potential in the supercharger
but not the nerve yet to spin it faster on the dyno!
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Antnicuk
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| posted on 21/4/09 at 04:41 PM |
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i'm not sure of the exact weight of mine but it will be between 650 and 700 kg. The initial dyno run it had 320 bhp and 330 ftlbs at 8 psi peak
but quickly dropped of to 3-4 psi as the turbo was too small.
To work out bhp per ton i just work out what percentage of a ton the car weighs and then multiply the bhp by that amount.
ie 565 x 1.77 = 1000kg
so 270 bhp x 1.77 = 478 bhp p/t or 566 p/tnat 320 bhp. not sure if this the correct way to do it.
I have never used car test, i dont think you can guess at 1/4 miles times based on power/torque as there are soo many other factors, like technique,
tyres, traction, shift speed.
I have drag raced it once, i did 4 runs with a best of 11.7. I know the car could do better with a better clutch as i managed a 1.8 60ft time but the
clutch never recovered and slipped all the way up the track, when i launched a little more gently, i ran the 11.7 with a 60ft time of 2.0 sec so i
know i can get at least 0.2 of a second off.
I am fitting a better clutch after the new turbo but it was never built for drag and i will only do it once to see what it runs with the new turbo.
10's is just a dream really but aim high, thats what i say 
600 BHP per ton, Stylus Brought back from the dead! Turbo Rotary Powered!
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MikeRJ
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| posted on 21/4/09 at 06:28 PM |
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quote:
Originally posted by Antnicuk
To work out bhp per ton i just work out what percentage of a ton the car weighs and then multiply the bhp by that amount.
ie 565 x 1.77 = 1000kg
so 270 bhp x 1.77 = 478 bhp p/t or 566 p/tnat 320 bhp. not sure if this the correct way to do it.
It's a slightly roundabout way of doing thing but it's the correct result. Easier to just divide power by weight in tonnes e.g.
270 / 0.565 = 478bhp/tonne
quote:
Originally posted by Antnicuk
I have never used car test, i dont think you can guess at 1/4 miles times based on power/torque as there are soo many other factors, like technique,
tyres, traction, shift speed.
Considering the number of variables, they can give surprisingly accurate results. e.g. this
one gives a 1/4 mile time of 11.6 seconds for your car.
After having a quick play various different calculators suggest you will be needing in the region of 430bhp to break the 11 second barrier.
[Edited on 21/4/09 by MikeRJ]
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Antnicuk
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| posted on 21/4/09 at 07:32 PM |
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that is quite accurate, must try harder then.
I knew there must be an easier way to work it out but i was crap at maths, thanks.
At very best i'm hoping for 400 fly but it will probably be more like 370 ish. If I do it again, i will borrow a pair of slicks! 
[Edited on 21-4-09 by Antnicuk]
600 BHP per ton, Stylus Brought back from the dead! Turbo Rotary Powered!
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bimbleuk
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| posted on 21/4/09 at 08:31 PM |
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Mine is 640kg with me in it so I guesstamated yours would be around the same having very similar underpinnings. I know the rotaries are good for low C
of G but are very dense so usually work out similar to CEC engines in weight, in turbo form anyway.
Cartest is an old program but has a lot of paramaters you can taylor right down to clutch engament times and transmission inertia if you want to work
it all out. So far its proven quite reliable compared to real figures. Though always accept its gives the absolute best case each time cus it excludes
the human factor!
I've had to invest in a paddle clutch recently, as similar to above I could always launch gently but a dump would overwhelm the re-con clutches
I've been using up till now. I'd rather spend a bit more now and save me the hassle of changing the friction plates regularly.
Antnicuk - You have 100 lbs ft more than me already! So you're well on your way to achieveng that 10s goal. I can't imagine my type 9
surviving that amount of torque which is also why I've not fitted an LSD yet either to protect my puny shortened Sierra driveshafts.
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Antnicuk
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| posted on 21/4/09 at 09:13 PM |
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Rob farley's zetec N/A stylus is 615 without driver, i have a heavier atlas axle, full roll cage, padded seats, carpet and no weight saving
measures whereas rob has done what he can to save weight so i reckon mine would be in the region of 650 - 700 empty.
my diff ratio of 3.09 isnt helping me, the torque compensates for it but i need a higher diff ratio. The stock RX7 diff ratio for the gearbox
i'm using is 4.1 with 16 inch wheels and still does 160 mph, hence mine is geared for 230 mph
[Edited on 21-4-09 by Antnicuk]
600 BHP per ton, Stylus Brought back from the dead! Turbo Rotary Powered!
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bimbleuk
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| posted on 22/4/09 at 10:58 AM |
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quote:
Originally posted by Antnicuk
my diff ratio of 3.09 isnt helping me, the torque compensates for it but i need a higher diff ratio. The stock RX7 diff ratio for the gearbox
i'm using is 4.1 with 16 inch wheels and still does 160 mph, hence mine is geared for 230 mph
Ah now that's exactly why I used Cartest to decide which was the best gearbox and diff ratios for my car. I made profiles for each combo and did
some comparison tests. I did have a 4.44:1 diff in my car and assumed this would be faster but actually spent too much time changing gears and hitting
the limiter so swapped a 3.92:1 diff in instead. This gave the best combo of acceleration, top speed and crusing RPM.
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Antnicuk
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| posted on 30/4/09 at 08:40 PM |
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made the manifold in stainless last weekend, this weekend i will be repositioning the steering column a little, then fab a new down pipe and centre
box in 3 inch.
[Edited on 30-4-09 by Antnicuk]
600 BHP per ton, Stylus Brought back from the dead! Turbo Rotary Powered!
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Antnicuk
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| posted on 9/5/09 at 09:13 PM |
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its all in and fitted, just got to move my tools out of the way, pull the car out of the garage, fill it with water and start it up. Hopefully the
exhaust wont leak. Then i will have to get busy making some heat sheilds. Its booked in for a remapping session on the 21st.
[Edited on 9-5-09 by Antnicuk]
600 BHP per ton, Stylus Brought back from the dead! Turbo Rotary Powered!
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