First Dyno done.
Thread Starter
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 26
From: Austin Texas
First Dyno done.
Just back from the first Dyno run on my Z51 6spd. 32xx miles,easy breakin, the only mod is the Magnaflow #14336 mufflers and tips.No scanner so I can't post the graph but;
SAE corrected (1.05 factor)
Smoothing 3
349.91 peak HP @ 5800-5900 RPM
346.61 peak Torque @ 4000 to 4800 RPM
Nice flat TQ curve, over 300#'s from 2000 to 6000 RPM.
Linear HP curve, nearly a straight line from 150HP @ 2000 RPM to the 350HP peak @ 6000 RPM.
A/F was consistent 12.5 : 1 after full throttle @1800 RPM except I tried some thing different for the second run, instead of flooring it @ 1800 he gradually applied throttle until 3500 RPM and then floored it, Changed was the A/F ratio, instead of a constant 12.5 it was 14.7 A/F until he floored it then the same 12.5 : 1. I lost maybe 30#'s TQ and 15 HP at part throttle but once he floored it at 3500 the graphs are the same.
Brand new shop with an in-floor Dyno, knowledgable people with a good attitude (and good prices) just minutes south of Austin in Buda.
I'm real happy with the results, now I have a baseline to compare to.
SAE corrected (1.05 factor)
Smoothing 3
349.91 peak HP @ 5800-5900 RPM
346.61 peak Torque @ 4000 to 4800 RPM
Nice flat TQ curve, over 300#'s from 2000 to 6000 RPM.
Linear HP curve, nearly a straight line from 150HP @ 2000 RPM to the 350HP peak @ 6000 RPM.
A/F was consistent 12.5 : 1 after full throttle @1800 RPM except I tried some thing different for the second run, instead of flooring it @ 1800 he gradually applied throttle until 3500 RPM and then floored it, Changed was the A/F ratio, instead of a constant 12.5 it was 14.7 A/F until he floored it then the same 12.5 : 1. I lost maybe 30#'s TQ and 15 HP at part throttle but once he floored it at 3500 the graphs are the same.
Brand new shop with an in-floor Dyno, knowledgable people with a good attitude (and good prices) just minutes south of Austin in Buda.
I'm real happy with the results, now I have a baseline to compare to.
Thread Starter
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 26
From: Austin Texas
Originally Posted by SA HEAT
What's the name of the shop?
Thread Starter
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 26
From: Austin Texas
Originally Posted by jchazr
How did you break the car in? Following the manual or did you drive it hard? What mileage was it dyno'd at? Thanks,
Joe
Joe
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Thread Starter
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 26
From: Austin Texas
Originally Posted by TexasTechZ06
Just some advice....throw some non syn oil in it!!!! It allows the rings to seat better. You have some great numbers!
352.1 RWHP342.5 RWTQ were my numbers!
352.1 RWHP342.5 RWTQ were my numbers!
I don't know about G.M. but Dodge sets the PCM rich for the first 3,000 miles. If it's running rich it should help with the ring seating, the rich A/F mix helps wash some oil off the cylinder walls (and helps keep combustion temps down).
The A/F on my Dyno dropped to aprx 12.2 : 1 at 5,000 RPM to shut off, but that was with a tailpipe sniffer, not a wideband. I hope that changes to leaner with more miles.
Intermediate
Joined: Jun 2005
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Originally Posted by TexasTechZ06
Just some advice....throw some non syn oil in it!!!! It allows the rings to seat better. You have some great numbers!
352.1 RWHP342.5 RWTQ were my numbers!
352.1 RWHP342.5 RWTQ were my numbers!
when do you change the oil and for how long?
Thread Starter
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 26
From: Austin Texas
Just talked to Charles at A.R.T., he said $50.00 for 2 pulls with A/F for anybody that wants to have their car dyno'd. Call A.R.T. @
512-312-2258 or 1-866-313-7223 toll free. Lots of experience and knowledge at this shop.
512-312-2258 or 1-866-313-7223 toll free. Lots of experience and knowledge at this shop.
