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10-14-2005, 12:11 PM
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Registered User
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Join Date: Nov 2002
Location: SF Gay Area
Posts: 1,604
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Anthony,
Are saying this car makes 150 wheel bhp? Wow!
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10-14-2005, 12:38 PM
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Registered User
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Join Date: Feb 2003
Location: Vista, CA
Posts: 730
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 Quote:
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Originally Posted by italcarguy
Bruce, I have been thinking the same thing. I told the guy to take it upto 7500 rpm. The speed makes no sense with that rpm. He might have stopped it low. The tach is off by 100 rpm, I made sure to have it tested before I started to race it. The car is not positive grounded. When they hooked it up to the dyno to do this run, I told them just to give me the horsepower print out. The car was down 19 hp on their dyno so that could be from not taking it to 7500. Either way, it was fun seeing and hearing the car run in that room.
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AWESOME!
__________________
Bruce Colby
Competition Director, AROSC
'65 Sprint GT (TS race)
'69 1750 GTV (TS street)
'71 Jr. Z (special occasions)
'89 E30 (the dark side)
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'69 1750 Spider (sold  )
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10-14-2005, 01:02 PM
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Super Moderator
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Join Date: Nov 2002
Location: Northridge, California
Posts: 5,940
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Quote:
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Originally Posted by 75evo
Anthony,
Are saying this car makes 150 wheel bhp? Wow!
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 The GTA will stomp on my GT Jr.
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10-14-2005, 01:09 PM
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Registered User
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Join Date: May 2003
Location: Southern California
Posts: 608
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Anthony,
What do the two cars weigh? My guess is the Jr. is at least 300 lbs heavier.
Also, thanks again for the ride in the GTA. I still want "a real" one on the track someday!
__________________
Garrett
'69 1750 GTV
'91 164L - For Sale!
Cogito, ergo Alfa Romeo
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10-14-2005, 01:40 PM
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Quote:
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Originally Posted by Bruce Colby
There's something I don't seem to understand here. Maybe someone can point out the error(s) in my thinking. This run was terminated at just under 85 mph. Assuming that the pull was done in 4th gear and that this car has a 5.12 rearend (I think this is what Anthony said he was running) and that the tires are a size that run at about 895 rev/mile, 85 mph would be reached at about 6500 rpm. Doesn't this seems a bit early to terminate the run?
Before someone tries to tell me my calculations are wrong, I also did them for my own car (data not yet posted). However, I happen to have both rpm and mph printouts so I can check the calculations. My pull cutoff was at 5750 rpm or 94 mph as near as I can read the graphs. With (new) tires that tirerack says are 893 rev/mile, a 4.10 rearend and in 4th gear, my calculations say 5750 rpm corresponds to 94.1 mph.
After my runs, the "driver" said he had shutdown at an indicated 6500 on the (mechanical) tach. He wanted me to know that the dyno reading indicated that this was actually 5700 rpm. This is a bit more error than I would have anticipated but I'll believe the dyno reading before I'll believe a 40 yr old mechanical tech.
Maybe I'm answering my own question here. According to what we were told at the event, Anthony's car had a positive ground (right hand drive = British origin?) and this in turn caused problems with the dyno (no rpm readout?). Maybe they shutdown the GTA run based on a mechanical tach reading that was in error.
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10-14-2005, 01:43 PM
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Super Moderator
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Join Date: Nov 2002
Location: Northridge, California
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Quote:
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Originally Posted by ar1750gtv
Anthony,
What do the two cars weigh? My guess is the Jr. is at least 300 lbs heavier.
Also, thanks again for the ride in the GTA. I still want "a real" one on the track someday!
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Next time I have the GTA at an AROSC, you'll get the ride of your life, remember to bring your diapers.
Quote:
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Originally Posted by VeniVidiVeloce
The car stopped making power, read: HP went flat. Why push it?
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It picks up again. The power flattens out at 7400 rpm.
Last edited by italcarguy; 10-14-2005 at 01:52 PM.
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10-14-2005, 03:30 PM
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Senior Member
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Join Date: Mar 2003
Location: Claremont, CA
Posts: 430
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Quote:
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Originally Posted by Bruce Colby
After my runs, the "driver" said he had shutdown at an indicated 6500 on the (mechanical) tach. He wanted me to know that the dyno reading indicated that this was actually 5700 rpm. This is a bit more error than I would have anticipated but I'll believe the dyno reading before I'll believe a 40 yr old mechanical tech.
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FWIW, my mechanical tach reads 7000 rpm against (Dave Evans') dyno's 6200 reading, almost exactly the same error you're getting.
"The older I get, the faster I was" seems to apply not only to my driving but to our tachs as well :-)
Regards
Wil Painter
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10-15-2005, 12:10 PM
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Registered User
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Join Date: Feb 2003
Location: Vista, CA
Posts: 730
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Quote:
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Originally Posted by VeniVidiVeloce
The car stopped making power, read: HP went flat. Why push it?
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__________________
Bruce Colby
Competition Director, AROSC
'65 Sprint GT (TS race)
'69 1750 GTV (TS street)
'71 Jr. Z (special occasions)
'89 E30 (the dark side)
----------------------------
'69 1750 Spider (sold )
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10-15-2005, 12:23 PM
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Registered User
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Join Date: Feb 2003
Location: Vista, CA
Posts: 730
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Quote:
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Originally Posted by Wil Painter
Bruce:
FWIW, my mechanical tach reads 7000 rpm against (Dave Evans') dyno's 6200 reading, almost exactly the same error you're getting.
"The older I get, the faster I was" seems to apply not only to my driving but to our tachs as well :-)
Regards
Wil Painter
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__________________
Bruce Colby
Competition Director, AROSC
'65 Sprint GT (TS race)
'69 1750 GTV (TS street)
'71 Jr. Z (special occasions)
'89 E30 (the dark side)
----------------------------
'69 1750 Spider (sold )
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10-15-2005, 12:54 PM
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Admin
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Join Date: Nov 2002
Location: Santa Clarita, CA
Posts: 4,529
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10-15-2005, 01:15 PM
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Admin
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Join Date: Nov 2002
Location: Santa Clarita, CA
Posts: 4,529
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Just added three more for your viewing pleasure.
Im thinking of re-encoding the videos into QuickTime format also as soon as I have a chance. Ive had a few PM's mentioning they cant view the files.
Stay tuned, more to come....
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10-17-2005, 09:03 AM
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Registered User
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Join Date: May 2003
Location: Southern California
Posts: 608
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The reason I think David Wong's run was interesting is because he managed 133 HP from a mildly modified 2-liter with a Wes Ingram HP SPICA pump. This was the highest figures for any 2-liter car of the day. It also had the steepest power curve! I think this proves that SPICA gives up nothing over carbs. The motor was running pretty rich as well. If the induction system could be tuned a little better it might even do better.
David,
Would you give us the specs of your motor?
__________________
Garrett
'69 1750 GTV
'91 164L - For Sale!
Cogito, ergo Alfa Romeo
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10-18-2005, 01:44 AM
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Admin
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Join Date: Nov 2002
Location: Santa Clarita, CA
Posts: 4,529
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Quote:
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Originally Posted by ar1750gtv
I think David Wong's run was interesting
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I have added MPEG files to each post above for those of you who are on non-windows computers. Let me know it they work out for you.
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10-18-2005, 04:41 PM
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Admin
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Join Date: Nov 2002
Location: Santa Clarita, CA
Posts: 4,529
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Cant stop listening to the sound that David's car makes when they drop the pedal. BrahhhhhhhhhhhhhhhhhhhhhhhhhhhhBrahhhhhhhhhhh!!!!  |
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