Re: It's a turd, what to look for?
[Re: parksr5]
#3088903
10/24/22 05:06 PM
10/24/22 05:06 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
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I Live Here
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So. Burlington, Vt.
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Dwayne spec'd the new cam for this combination, out of respect for him, I didn't post up the exact specs of the new cam. If he's okay with me posting them, I'll gladly share them.
You can post them if you like, especially since everyone is so sure that it’s wrong. Even though that same cam(and a bigger one) has already gone mid-11’s in a similar combo. A cranking compression test would help shed some light on that situation.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: It's a turd, what to look for?
[Re: krautrock]
#3088906
10/24/22 05:11 PM
10/24/22 05:11 PM
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Joined: Mar 2009
Posts: 889 Oh
parksr5
OP
super stock
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OP
super stock
Joined: Mar 2009
Posts: 889
Oh
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was the "301" intake and Edelbrock 800 carb on the motor on the dyno??
looks like your TCI converter is supposed to be about 1500rpm higher than stock. is it flashing to 3500rpm?? Yes, both the intake and 800 carb were run on the engine on the dyno. I feel that the converter was not flashing at 3500rpm but, not too much lower.
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Re: It's a turd, what to look for?
[Re: lewtot184]
#3088907
10/24/22 05:14 PM
10/24/22 05:14 PM
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Joined: Mar 2009
Posts: 889 Oh
parksr5
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super stock
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OP
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IMO i wouldn't use that xe274 cam with stock manifolds, and definitely wouldn't use the 250@.50" with manifolds. that being said losing about .25 of a second with manifolds vs the headers does make some sense. with the "250" cam put the headers back on. you need the separation of the exhaust pulses plus the have more volume. i also i would take a very serious look at fuel delivery. dumb things can happen between the tank and carb; cracked hose, pump push rod, inadequate pump, etc. my experience with those 800 carbs has been they are more likely to be rich than lean as they come out of the box. Correct, the xe274 cam is not really set up for stock manifolds but, I wasn't unhappy with the results when I tried it. About what I would have thought. The headers will not be going back on as I'm interested in the FAST class, I've been making changes to move in that direction. The fuel delivery issues are up on the list of things to check.
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Re: It's a turd, what to look for?
[Re: parksr5]
#3088923
10/24/22 06:50 PM
10/24/22 06:50 PM
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Joined: Jan 2003
Posts: 6,145 Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,145
Melbourne , Australia
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This is more a general question, do the F.A.S.T guys dyno their engines with their exhaust manifolds with part of the exhaust?
Alan Jones
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Re: It's a turd, what to look for?
[Re: parksr5]
#3089042
10/25/22 08:13 AM
10/25/22 08:13 AM
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Joined: Jun 2008
Posts: 3,916 usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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IMO i wouldn't use that xe274 cam with stock manifolds, and definitely wouldn't use the 250@.50" with manifolds. that being said losing about .25 of a second with manifolds vs the headers does make some sense. with the "250" cam put the headers back on. you need the separation of the exhaust pulses plus the have more volume. i also i would take a very serious look at fuel delivery. dumb things can happen between the tank and carb; cracked hose, pump push rod, inadequate pump, etc. my experience with those 800 carbs has been they are more likely to be rich than lean as they come out of the box. Correct, the xe274 cam is not really set up for stock manifolds but, I wasn't unhappy with the results when I tried it. About what I would have thought. The headers will not be going back on as I'm interested in the FAST class, I've been making changes to move in that direction. The fuel delivery issues are up on the list of things to check. my quickie guess is the engine is in the process of eating the fuel pump push rod. that would account for the majority of power loss. just a first place to look guess.
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Re: It's a turd, what to look for?
[Re: parksr5]
#3089044
10/25/22 08:21 AM
10/25/22 08:21 AM
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Joined: Jan 2003
Posts: 13,369 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Marion, South Carolina [><]
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I can tell you one thing...Dynomax Super Turbo mufflers are great for a nice mellow sound, but flow like garbage. Get a straight through style muffler.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: It's a turd, what to look for?
[Re: LA360]
#3089045
10/25/22 08:23 AM
10/25/22 08:23 AM
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Joined: Dec 2005
Posts: 1,495 Shelby mi.
JAKE68
pro stock
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pro stock
Joined: Dec 2005
Posts: 1,495
Shelby mi.
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This is more a general question, do the F.A.S.T guys dyno their engines with their exhaust manifolds with part of the exhaust? yes with the ones i have seen.
JAKES AUTOMOTIVE
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Re: It's a turd, what to look for?
[Re: JAKE68]
#3089051
10/25/22 09:07 AM
10/25/22 09:07 AM
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Joined: Jun 2006
Posts: 5,163 CT
GTX MATT
master
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master
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Posts: 5,163
CT
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So in a nutshell changes are
Ported factory intake instead of the RPM Manifolds with Super Turbos instead of headers and Flowmasters Custom cam instead of XE274 800 AVS instead of 850 HP Holley
Assuming you don’t have a fuel supply issue, if the cam is right and you’re determined to make it work with the manifolds i’d try the RPM again with the 850. Maybe your ported intake doesn’t work that well. If it picks up alot try the AVS to see if it likes it or not compared to the Holley.
I also think Super Turbos aren’t a great choice, but not sure if it matters with the manifolds or not. Thats where I’d go after the intake if you’re determined to make it work.
Last edited by GTX MATT; 10/25/22 09:11 AM.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
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Re: It's a turd, what to look for?
[Re: an8sec70cuda]
#3089208
10/25/22 09:46 PM
10/25/22 09:46 PM
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Joined: Aug 2003
Posts: 43,223 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,223
Bend,OR USA
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I can tell you one thing...Dynomax Super Turbo mufflers are great for a nice mellow sound, but flow like garbage. Get a straight through style muffler. One of my old street and strip drag cars would pickup .9 ET (12.23 with them on and 11.39 removed) and 9+ MPH (109.4 versus 117.8 with them off with no other changes ) by removing the 2.5 inch pipes with the old Turbo muffs with 2.5 inch O.D. tailpipes that exited in front of the rear tires on my 1969 Dart GTS 440 powered My Duster had a set of the cheaper crimp together Magnaflow 14x7x 3.0 inlet and outlet oval muffs straight through with perforate pipe, it ran 7.01 ET in the 1/8 mile with them on and 6.98 with them off Those muffs were mounted behind the rear end between the 1/4 panels in rear sub frames. That really surprised me and impress me I can't find them anywhere to buy them now
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: It's a turd, what to look for?
[Re: lewtot184]
#3089315
10/26/22 10:38 AM
10/26/22 10:38 AM
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Joined: Feb 2016
Posts: 55 CT
roadrunner2
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member
Joined: Feb 2016
Posts: 55
CT
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Two replies I’ve seen on here that bare looking at. First is the fuel pump push rod. I had this issue with mine. Only lost .125 but killed a ton of speed. Second is the turbo mufflers. Not a good choice for flow especially with a 500” engine. I switched from Pypes Street Pros to their Race Pros and picked up a bunch.
Bill
1968 Road Runner 383 727 3.91 8 3/4 3520 with driver 11.04 @ 124.26 with 1.67 60’ Done on G70-14 redlines thru factory manifolds New quickest ever 383 build in FAST. 10:1 451” replaced with 14:1 499”.
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Re: It's a turd, what to look for?
[Re: LA360]
#3089327
10/26/22 11:14 AM
10/26/22 11:14 AM
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Joined: Jan 2003
Posts: 75,043 U.S.S.A.
JohnRR
I Win
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I Win
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Posts: 75,043
U.S.S.A.
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This is more a general question, do the F.A.S.T guys dyno their engines with their exhaust manifolds with part of the exhaust? The F.A.S.T. guys that are serious I imagine would ? I'm in the process of restarting my F.A.S.T. build and when it goes on the Dyno it will be with the manifolds I plan to run. I'll also bring my headpipes and a second shorter set if the ones I plan to run won't fit the space allowed.
running up my post count some more .
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Re: It's a turd, what to look for?
[Re: moparx]
#3089328
10/26/22 11:22 AM
10/26/22 11:22 AM
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Joined: Jan 2003
Posts: 75,043 U.S.S.A.
JohnRR
I Win
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I Win
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U.S.S.A.
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how much could the exhaust manifolds be ported ? if that is a possibility, do the FAST guys do anything in addition to having that gritty stuff [i forget the name] pumped through them ? There are things one can do, port matching is a must. The last set of stock manifolds I tweaked for a friends build needed at least an 1/8" of material ground out of the port entrances on at least 2 surfaces to get it to match the gasket. I have a set of reworked A body 383 manifolds that have had as much grinding as can be down withOUT cutting them in half and a piece welded in place where there was an internal divot to clear the flange bolt install. The divot was removed , welded from the outside and the flange tapped for a stud instead of the bolt. After all the work was done they were Jet Hot coated inside and out, I don't know if they were extrude honed. The manifolds were done by the late Greg Gessler. I am going to try to compare them to an untouched set when I dyno to see how much it picks up.
Last edited by JohnRR; 10/27/22 12:15 PM.
running up my post count some more .
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Re: It's a turd, what to look for?
[Re: JohnRR]
#3089531
10/26/22 10:57 PM
10/26/22 10:57 PM
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Joined: Feb 2005
Posts: 4,316 Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,316
Prospect, PA
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...........by the late Greg Gessler.
Crap. Another good one. Sad and sorry to hear
Last edited by BSB67; 10/26/22 10:58 PM.
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Re: It's a turd, what to look for?
[Re: BSB67]
#3089544
10/27/22 12:23 AM
10/27/22 12:23 AM
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Joined: May 2012
Posts: 1,839 South Bend
John Brown
top fuel
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top fuel
Joined: May 2012
Posts: 1,839
South Bend
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...........by the late Greg Gessler.
Crap. Another good one. Sad and sorry to hear Same here. Greg Gessler did a pair of exhaust manifolds for my FAST 70 Nova small block car. This is the first I had heard of his passing. RIP Greg. -> Greg Gessler obit <-
July 19th should be "Drive Like Rockford Day". R.I.P. Jimmie.
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