What's holding it back

The car trapped 106 at 3600 lbs. Which is pretty good for what's in the motor. To answer the question of "what's holding it back"? Nothing. It runs just like it should. Don't like the dyno number, find another dyno that gives you the numbers you want, lol.

1975 Cherokee S - Turbo Hemi stick shift autocross/drag race/street 9.97 @ 140.4

Yes, basically need to run it at the strip now to see if I have gone forwards or backwards.

Here is the previous dyno run for comparison, this was a couple of years ago before the transmission rebuild, rear gear and exhaust changes.

Can't figure out why this isn't coming up on my computer, can anybody else see it?

And the current one again to make comparison easier:

Different dynos and units make it difficult to make a comparison and I'm certainly hoping it hasn't gone backwards as indicated by the peak numbers. Maybe I've hurt something inbetween, but the engine hasn't got a lot of miles on it. The only change since the 13.1 run is the exhaust and it's hard to see that making it worse.

Really just interested to know where the limiting factor might be with the current setup, is it the cam, head flow, exhaust, intake, carb? Probably not going to pull the heads off to get them ported, but might consider a cam change in the scheme of things if not limited elsewhere. No point in putting a bigger cam in though if the rest of the package won't support it.

Edited by WesternRed - Oct/25/2014 at 7:27pm

I'm getting sweaty just reading about this BSFC stuff....what is it, anyhoo?

1969 Rebel SST (1970-1987)
1968 AMX (2005-2011)
1969 SC/Rambler (2011-2019)
1970 Javelin (2019 to ?)"Jane"

opps, what's with the posts going out of sequence.

Look you two rocket scientists, if you don't understand the importance of BSFC on a dyno run then don't criticize me for asking for it. Okay? Sheesh.

ahum

Roger Gazur
1969 'B' Scheme SC/Rambler
1970 RWB 4-spd Machine
1970 Sonic Silver auto AMX

All project cars.

Forum Cockroach

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tsanchez Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Jul/09/2007 Location: Arizona Status: Offline Points: 4303	Post Options Post Reply Quote tsanchez Report Post Thanks(1) Quote Reply Posted: Oct/25/2014 at 6:35pm
	Well that's just gay


ghinmi Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Apr/04/2010 Location: Grand Rapids MI Status: Offline Points: 978	Post Options Post Reply Quote ghinmi Report Post Thanks(0) Quote Reply Posted: Oct/25/2014 at 6:35pm
	The car trapped 106 at 3600 lbs. Which is pretty good for what's in the motor. To answer the question of "what's holding it back"? Nothing. It runs just like it should. Don't like the dyno number, find another dyno that gives you the numbers you want, lol.
	1975 Cherokee S - Turbo Hemi stick shift autocross/drag race/street 9.97 @ 140.4

Ken_Parkman Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Jun/04/2009 Location: Ontario Status: Online Points: 1814	Post Options Post Reply Quote Ken_Parkman Report Post Thanks(0) Quote Reply Posted: Oct/25/2014 at 6:56pm
	Or find an operator who will fudge the correction factor.

WesternRed Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5799	Post Options Post Reply Quote WesternRed Report Post Thanks(0) Quote Reply Posted: Oct/25/2014 at 7:07pm
	Yes, basically need to run it at the strip now to see if I have gone forwards or backwards. Here is the previous dyno run for comparison, this was a couple of years ago before the transmission rebuild, rear gear and exhaust changes. Can't figure out why this isn't coming up on my computer, can anybody else see it? And the current one again to make comparison easier: Different dynos and units make it difficult to make a comparison and I'm certainly hoping it hasn't gone backwards as indicated by the peak numbers. Maybe I've hurt something inbetween, but the engine hasn't got a lot of miles on it. The only change since the 13.1 run is the exhaust and it's hard to see that making it worse. Really just interested to know where the limiting factor might be with the current setup, is it the cam, head flow, exhaust, intake, carb? Probably not going to pull the heads off to get them ported, but might consider a cam change in the scheme of things if not limited elsewhere. No point in putting a bigger cam in though if the rest of the package won't support it. Edited by WesternRed - Oct/25/2014 at 7:27pm

ghinmi Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Apr/04/2010 Location: Grand Rapids MI Status: Offline Points: 978	Post Options Post Reply Quote ghinmi Report Post Thanks(0) Quote Reply Posted: Oct/25/2014 at 7:39pm
	106 is good for mid 12s on a decent lanuch. If all you want to do is get into the 12s I'd look at a good converter (and tires if you're spinning) and leave the motor alone. I don't know how possible that is with your transmission of choice.
	1975 Cherokee S - Turbo Hemi stick shift autocross/drag race/street 9.97 @ 140.4

bikerfox Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: Aug/02/2009 Location: USA Status: Offline Points: 4465	Post Options Post Reply Quote bikerfox Report Post Thanks(0) Quote Reply Posted: Oct/25/2014 at 7:43pm
	I'm getting sweaty just reading about this BSFC stuff....what is it, anyhoo?
	1969 Rebel SST (1970-1987) 1968 AMX (2005-2011) 1969 SC/Rambler (2011-2019) 1970 Javelin (2019 to ?)"Jane"

WesternRed Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5799	Post Options Post Reply Quote WesternRed Report Post Thanks(0) Quote Reply Posted: Oct/25/2014 at 7:46pm
	No BSFC number's I'm afraid, haven't heard that term before. In their defence I'm sure the other two guys were commenting on the dyno vs track rather than BSFC.

WesternRed Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5799	Post Options Post Reply Quote WesternRed Report Post Thanks(0) Quote Reply Posted: Oct/25/2014 at 7:47pm
	opps, what's with the posts going out of sequence.

jcisworthy Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805	Post Options Post Reply Quote jcisworthy Report Post Thanks(0) Quote Reply Posted: Oct/25/2014 at 7:53pm
	Ported heads and a torker will probably get .3-.5 at the track with no other changes.

6PakBee Members Profile Send Private Message Find Members Posts Add to Buddy List Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5457	Post Options Post Reply Quote 6PakBee Report Post Thanks(0) Quote Reply Posted: Oct/25/2014 at 7:53pm
	Look you two rocket scientists, if you don't understand the importance of BSFC on a dyno run then don't criticize me for asking for it. Okay? Sheesh.
	Roger Gazur 1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach