| Author |
Message |
Joshua White
Tinkerer
Qld
SC400 GT V8 Supercharged
Posts: 50
Reg: 11-2006
|
hey guys, was wondering if any of you had dyno results for your supercharged v8's, just curious |
Jan Christiansson
TryHard
NSW
Soarer V8 SC Manual
Posts: 329
Reg: 07-2005
|
This is an old one, soon I will have an update.
|
Brett Moloney
TryHard
Queensland
UZZ31
Posts: 408
Reg: 07-2005
|
This at 8psi
now running 12psi but no dyno yet, also have removed 180 speed limiter added RRfuel regulator and walbro fuel pump. |
Joshua White
Tinkerer
Qld
SC400 GT V8 Supercharged
Posts: 51
Reg: 11-2006
|
awesome, Brett how much psi were you running at the time for that one?! |
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder
Posts: 1381
Reg: 03-2006
|
Says above dyno chart..... 8psi!!!  |
Joshua White
Tinkerer
Qld
SC400 GT V8 Supercharged
Posts: 52
Reg: 11-2006
|
oh it does too, oops. just saw the picture and moved on |
Matthew Sharpe
Goo Roo
North Island
JZZ31
Posts: 2193
Reg: 10-2005
|
Wow, 232 and a nice smooth delivery too... getting up there with those TT guys!  |
Tai Johnsen
TryHard
QLD
UZZ31 - V8
Posts: 232
Reg: 04-2006
|
Brett, is it safe for the 1uz to rev that high.?
I'm wondering, if the centrifugal can support that PSI over that RPM, is there anything stopping you from increasing the compressor speed and boost to like 12PSI so it comes on earlier and runs out of puff lower in the rev range? |
Tim Appleton
DieHard
QLD
UZZ31
Posts: 577
Reg: 07-2005
|
There will be a problem with that.
The maximum rpm of the supercharger is the limiting factor. These superchargers don't tend to run out of puff. They are designed so that they will give maximum boost at maximum revs. They do not operate like a turbo, as you can't bypass revs in the way that you can bypass exhaust gas with a wastegate... unless you used a different type of drive mechanism. |
Tai Johnsen
TryHard
QLD
UZZ31 - V8
Posts: 233
Reg: 04-2006
|
Ok, say it's making 9 PSI at 8000rpm, and 1 PSI at 2000rpm. If you set up the pulley ratio to give the 9PSI at 6000rpm, wont it be spinning faster at 2000rpm therefore making more than 1PSI?
Is there such a thing as a CVT to keep a constant compressor speed as the engine rpm increases..? |
Brett Moloney
TryHard
Queensland
UZZ31
Posts: 412
Reg: 07-2005
|
Tai Johnsen wrote on Wednesday, February 28, 2007 - 02:48 pm:Is there such a thing as a CVT to keep a constant compressor speed as the engine rpm increases..?
Not that I am aware of. The centrifugal blowers are RPM dependent.
Tai Johnsen wrote on Wednesday, February 28, 2007 - 11:47 am:Brett, is it safe for the 1uz to rev that high.?
Our ECUs have a factory rev limiter and this will prevent damage to the motor. |
Neil Griffiths
Trader
NSW
212Kw @ 8psi MANUAL Super Charged UZZ31 
Posts: 3615
Reg: 07-2005
|
You CAN overspeed a Blower ( Rootes / Screw Type ) Unsure on the Centri Type.
I can show 230RwKw at about 5,500rpm from Memory
Starting at about 110 around 2,400rpm
The Owner will scan and show the sheet soon. |
Steven Anderson
Tinkerer
NSW
UZZ31
Posts: 93
Reg: 05-2006
|
Tai Johnsen wrote on Wednesday, February 28, 2007 - 02:48 pm:Ok, say it's making 9 PSI at 8000rpm, and 1 PSI at 2000rpm. If you set up the pulley ratio to give the 9PSI at 6000rpm, wont it be spinning faster at 2000rpm therefore making more than 1PSI?
yes, you have to decide what your maximum revs will be and your maximum boost limitations are (within specs of what the blower can handle in rev's and the engine can handle in PSI) and then gear it accordingly. |
Cihan Aday
Goo Roo
Plug-in Emanage's - Now Available - Tuned to spec
JZZ30
Posts: 1802
Reg: 07-2005
|
Neil Griffiths wrote on Wednesday, February 28, 2007 - 06:39 pm:You CAN overspeed a Blower ( Rootes / Screw Type ) Unsure on the Centri Type.
You can overspeed anything belt driven.
Centri's have a compressor and therefore have a compressor map. You can use a higher pulley ratio to provide more boost at lower RPM's but as you approach max rotating speed, gains from additional boost are offset by growing compressor inefficiencies. You might even loose topend power in sacrifice for lowend power which is not what a centrifugal setup is designed for. |
Tim Appleton
DieHard
QLD
UZZ31
Posts: 581
Reg: 07-2005
|
Neil, you can overspeed a centrifugal type as well. The impellers don't like more than about 50,000 rpm, just like a turbo.
Sorry Tai, I think I read your query wrong. I think Steven has it covered.
I have a silly idea for a variable speed drive, but it needs more investigation first. |
Leon Wright
DieHard
WA
V8 UZZ31
Posts: 530
Reg: 08-2006
|
Tim Appleton wrote on Wednesday, February 28, 2007 - 10:50 pm:I have a silly idea for a variable speed drive, but it needs more investigation first.
Good Inventions usually start out as a silly idea.  |
Tai Johnsen
TryHard
QLD
UZZ31 - V8
Posts: 234
Reg: 04-2006
|
Brett Moloney wrote on Wednesday, February 28, 2007 - 05:00 pm:Our ECUs have a factory rev limiter and this will prevent damage to the motor.
Going by the graph it looks like it's topping out at 7800rpm, i thought the factory rev limit was 6250? |
Peter Nitschke
JunkFilterer
South Australia
GT4.0 V8
Posts: 7115
Reg: 11-2004
|
Where do you get 7800 RPM from? I can only see KPH on the graph. |
Tai Johnsen
TryHard
QLD
UZZ31 - V8
Posts: 235
Reg: 04-2006
|
Is the column on the right not RPM?  |
Benjamin Burgess
Goo Roo
NSW
Toyota Soarer GT-TL, Toyota Corolla Conquest
Posts: 1121
Reg: 07-2005
|
Thats tractive effort. Revs would need to be translated from the x-axis which is speed, but you'd need to know diff ratio, gearing and tyre size. |
Brett Moloney
TryHard
Queensland
UZZ31
Posts: 413
Reg: 07-2005
|
Tai Johnsen wrote on Thursday, March 01, 2007 - 03:32 pm:Is the column on the right not RPM?
Tai it is Nm not rpm for the bottom graph line |
Tai Johnsen
TryHard
QLD
UZZ31 - V8
Posts: 236
Reg: 04-2006
|
DOWP!! 
Thanks guys... well there goes all of my comparisons of the centrifugal v's roots 
Is there a dyno graph which has rpm instead of Km/h.? |
Peter Nitschke
JunkFilterer
South Australia
GT4.0 V8
Posts: 7117
Reg: 11-2004
|
Unless you do your own rough conversion, you would need an engine dyno, not a rear wheel dyno.
Pulling the donk out just to dyno it is probably more work than anyone wants to do. |
Joshua White
Tinkerer
Qld
SC400 GT V8 Supercharged
Posts: 53
Reg: 11-2006
|
so do all you guys think that going from the normal supercharger pulley which should be like 5-7 psi or so to 10 is worth it? cause i'm really looking into it and i've priced up a shift kit from mike's MV's and yeah i'm kinda trying to go for that looks hot as and goes just as good thing |
Tai Johnsen
TryHard
QLD
UZZ31 - V8
Posts: 237
Reg: 04-2006
|
Hrm.. Why do some have RPM on the x scale then? Is it because they are manual and you can convert wheel speed into rpm? Whereas these are auto's? |
David Vaughan
Goo Roo
ACT
V8 Ltd manual
Posts: 3046
Reg: 07-2005
|
Printing RPM could be done if the operator entered your rear diff ratio and gearbox ratio (latter should be 1:1), and the software provided for the calculation and printing -- not hard but not necessary either and so possibly not available in common wheel dyno products. Perhaps it is available and most operators could not be bothered because the owner rarely knows the diff ratio when asked anyway.
My recollection is that I have seen only speed rather than RPM but I may not have been paying attention. You can calculate RPM yourself by the same processes. |
Dennis Weglehner
Tinkerer
QLD
R31 Skyline with 2JZGTE and A340E
Posts: 60
Reg: 08-2006
|
They are lazy pricks. It takes 5 seconds to hook the RPM signal to the dyno from the diagnostics port. |
Blake Gloyn
Tinkerer
manawatu
soarer JZZ30 TT
Posts: 34
Reg: 02-2006
|
which is the rpm signal in the diagnostic port,Dennis? thanks. |
Dennis Weglehner
Tinkerer
QLD
R31 Skyline with 2JZGTE and A340E
Posts: 61
Reg: 08-2006
|
Not sure for your car mate You will have to find out, its one of the pins. Ask on the TT section. |
Tai Johnsen
TryHard
QLD
UZZ31 - V8
Posts: 245
Reg: 04-2006
|
From Lextreme:-
To clarify: I found a wiring diagram:
on the "igniter with the extra wire," the middle wire is black/white stripe labeled "IGT" on the wiring diagram, the wire next to it is solid black and labeled "TAC".
The "TAC" wire that will provide the needed signal..
Sounds like it should be the one..  |
Justin Staier
Tinkerer
qld
v8 limited
Posts: 43
Reg: 03-2006
|
My chart at the moment. Raptor SC, intercooler, headers, 95 fuel and 8 psi.
|
Gianni Matrogiannis
TryHard
nsw
SC400 V8
Posts: 132
Reg: 08-2005
|
mine is getting tuned now. on 10 psi it made 330rwhp (245rwkw) at 5000 rpm and 74% throttle, fuel pump gave up and so could not continue the tune, New fuel pump is in now (bosch 044) so its going in again for a tune. boost will be set to 14psi. |
Tai Johnsen
TryHard
QLD
UZZ31 - V8
Posts: 302
Reg: 04-2006
|
Jeez Gianni!!! those are some pretty healthy numbers.. Keep up posted on the results |
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