Stage 2 with 2.85 pulley base dyno run done today
08-10-2007, 03:57 PM
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Stage 2 with 2.85 pulley base dyno run done today
oops...this topic got posted twice so this is the thread staying open...
Ok..before any further comments about why the numbers are so low....
The Stage 2 GM tune and 42 lb injectors do not work with the 2.85 pulley in our case according to the dyno numbers and readings! We already knew it might not be right and numbers would suffer as components arent matched perfectly. Once we get the 60 lb injectors and a correct tune with correct fuel maps and timing curves for boost levels we will expect better #'s.
Initial base dyno run this morning to see where everything stood with the new 2.85 pulley with GM Stage 2 tune and 42 lb injectors. Dyno sea level at 83 degrees with 24% humidity. Only needed to do one run to 6700 as hp was already peaked and didnt need to go to rev limiter 7K.
IDC (injector duty cycle), hit 92% at 5600, 95% at 6000 and 117% at 6700 rpms. TOO MUCH!
AFR way too lean starting out around 14.65 and dropping down to 12.80 from 4200-6700 but still way too lean.
The timing curves for available boost levels were way off and were actually hovering around the low octane input lines in hptuners and were not where they needed to be and was pulling out a total of 8-10 degress timing through the whole pull pretty much from 4500-6700.
Definatly need and will get 60 lb injectors and a good tune changing fuel and timing curves and a whole ton of other adjustments as needed which should yield another 30+whp.
Ok..before any further comments about why the numbers are so low....
The Stage 2 GM tune and 42 lb injectors do not work with the 2.85 pulley in our case according to the dyno numbers and readings! We already knew it might not be right and numbers would suffer as components arent matched perfectly. Once we get the 60 lb injectors and a correct tune with correct fuel maps and timing curves for boost levels we will expect better #'s.
Initial base dyno run this morning to see where everything stood with the new 2.85 pulley with GM Stage 2 tune and 42 lb injectors. Dyno sea level at 83 degrees with 24% humidity. Only needed to do one run to 6700 as hp was already peaked and didnt need to go to rev limiter 7K.
IDC (injector duty cycle), hit 92% at 5600, 95% at 6000 and 117% at 6700 rpms. TOO MUCH!
AFR way too lean starting out around 14.65 and dropping down to 12.80 from 4200-6700 but still way too lean.
The timing curves for available boost levels were way off and were actually hovering around the low octane input lines in hptuners and were not where they needed to be and was pulling out a total of 8-10 degress timing through the whole pull pretty much from 4500-6700.
Definatly need and will get 60 lb injectors and a good tune changing fuel and timing curves and a whole ton of other adjustments as needed which should yield another 30+whp.
Last edited by sscobaltscZ06; 08-10-2007 at 09:12 PM.
08-10-2007, 04:08 PM
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Yes the hp/tq is low cause the S2 tune sucks with the 2.85 pulley and injectors not keeping up. We already knew the 42 lb injectors would not work with the 2.85 pulley and s2 tune so its no surprise the hp # was low and IDC was way over max %.
08-10-2007, 04:15 PM
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Dyno numbers
Cheers
08-10-2007, 04:29 PM
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same here.
42's
2.8
85% duty cycle at 7200.
another car i did. 42's. 2.85 86% duty cycle at 7k.
find someone who knows what they are doing. no two injectors are the same, neither are two cars. people really should keep this in mind.
42's
2.8
85% duty cycle at 7200.
another car i did. 42's. 2.85 86% duty cycle at 7k.
find someone who knows what they are doing. no two injectors are the same, neither are two cars. people really should keep this in mind.
08-10-2007, 04:36 PM
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I've seen a dozen cars with IDC's of over 100% at 6500 with a 2.80-2.85 from a dozen different areas and elevations around the USA and I've seen a dozen more that seemed to be just fine as well.
Lots of variables for sure but im sure not gonna travel around the state looking for a dozen different dynos to take an average from... I could care less what other cars get for their IDC's as im only concerned with this one. Theres no magic in getting a correct IDC reading.
Its no big deal and only costs around $300 with the harness required to go get some 60 lb injectors and throw em in and tune it.
Lots of variables for sure but im sure not gonna travel around the state looking for a dozen different dynos to take an average from... I could care less what other cars get for their IDC's as im only concerned with this one. Theres no magic in getting a correct IDC reading.
Its no big deal and only costs around $300 with the harness required to go get some 60 lb injectors and throw em in and tune it.
08-10-2007, 04:49 PM
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well im at 137% on stock injectors on a totally stock car running to 7k in hp tuners
when i get stage 2 id like to see what it does on the stage 2 pulley first
when i get stage 2 id like to see what it does on the stage 2 pulley first
08-10-2007, 04:49 PM
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Easy
I've seen a dozen cars with IDC's of over 100% at 6500 with a 2.80-2.85 from a dozen different areas and elevations around the USA and I've seen a dozen more that seemed to be just fine as well most if not all which were elevations of 3000 or higher.
Lots of variables for sure but im sure not gonna travel around the state looking for a dozen different dynos to take an average from... I could care less what other cars get for their IDC's as im only concerned with this one.
Lots of variables for sure but im sure not gonna travel around the state looking for a dozen different dynos to take an average from... I could care less what other cars get for their IDC's as im only concerned with this one.
Have a nice day.
08-10-2007, 05:04 PM
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its a pretty well known fact that 42lbers dont run 2.8 pulleys its more of a commonality than a rarity that it doesnt work
For every one person that posts thier findings that it does work theres prob 10 that dont work
For every one person that posts thier findings that it does work theres prob 10 that dont work
08-10-2007, 05:14 PM
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08-10-2007, 09:17 PM
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That is a pretty **** pour attitude. You posted your results and we graciously replied back with our findings and posted so you have some basis to look at and I do agree that one persons IDC will not be the same as another and no one expects you to travel the states looking for dynos to take an average. If you don't want imput then don't post.
Have a nice day.
Have a nice day.
I ordered hptuners this afternoon as it wasnt as expensive as I thought it was gonna be and will start learning it myself as we have 4 race cars I can use it on once I begin learning it, then I can only blame myself for numbers that dont look right instead of wondering if my dyno operator is doing everything correctly.
Anyway, I always have a nice day.....
08-10-2007, 09:24 PM
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08-10-2007, 10:12 PM
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Didnt need to go to 7k to find out the numbers we were wanting/needing to see. Hp had peaked at 6350 and started to drop off then anyway so there was no need to go further than that. He asked me if I wanted to make a run to 7K and I said no need to and he agreed. In San Francisco east bay area. I dont know how he calculated or what inputs he had in hptuners to calculate the idc's. Im investigating though as I know know there are several ways to do it after going through hptuners forums and seeing a couple threads on here as well by tuners.
08-11-2007, 03:10 AM
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Keep in mind, gentlemen, A dyno should only be used for tracking your own improvements, And that is if you stick with the same dyno every time. one dyno comparison to another may yield a 20hp difference, but the cars are exactly the same! So don't feel bad your dyno numbers aren't as great as other peoples. Get your car tuned to the best it can by that dyno, then take it to a track to see its real potential, and post up some times!
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