Help solving somewhat dissapointing low Dyno results
Thread Starter
Intermediate
Joined: Jul 2003
Posts: 32
Likes: 0
From: carrollton tx
Ok so I took the car to the northstar dragway (1/8 mile) in denton,tx last night. Here are the results. Keep in mind that this was my first time drag racing on a track.
pass 1
60' - 2.0372
330' - 5.4452
1/8 ET - 8.1955
1/8 MPH - 88.76
pass2
60' - 2.0051
330' - 5.4009
1/8 ET - 8.1340
1/8 MPH - 89.5
pass 3
60' - 1.9727
330' - 5.3682
1/8 ET - 8.1071
1/8 MPH - 90.4
Do these numbers correspond with Dyno results and mods?
Thanks for all the replies!
pass 1
60' - 2.0372
330' - 5.4452
1/8 ET - 8.1955
1/8 MPH - 88.76
pass2
60' - 2.0051
330' - 5.4009
1/8 ET - 8.1340
1/8 MPH - 89.5
pass 3
60' - 1.9727
330' - 5.3682
1/8 ET - 8.1071
1/8 MPH - 90.4
Do these numbers correspond with Dyno results and mods?
Thanks for all the replies!
Race Director
Joined: Jan 2008
Posts: 16,028
Likes: 170
From: oregon
Ok so I took the car to the northstar dragway (1/8 mile) in denton,tx last night. Here are the results. Keep in mind that this was my first time drag racing on a track.
pass 1
60' - 2.0372
330' - 5.4452
1/8 ET - 8.1955
1/8 MPH - 88.76
pass2
60' - 2.0051
330' - 5.4009
1/8 ET - 8.1340
1/8 MPH - 89.5
pass 3
60' - 1.9727
330' - 5.3682
1/8 ET - 8.1071
1/8 MPH - 90.4
Do these numbers correspond with Dyno results and mods?
Thanks for all the replies!
pass 1
60' - 2.0372
330' - 5.4452
1/8 ET - 8.1955
1/8 MPH - 88.76
pass2
60' - 2.0051
330' - 5.4009
1/8 ET - 8.1340
1/8 MPH - 89.5
pass 3
60' - 1.9727
330' - 5.3682
1/8 ET - 8.1071
1/8 MPH - 90.4
Do these numbers correspond with Dyno results and mods?
Thanks for all the replies!
i actually just dug up one of my old time slips. this was a completely stock 2002 z06 on a hot hot *** day. early sept of last year. 8.253@87.13mph
if you're making peak power at 6300-6400 the cam is what it says. if you had a lot of time and money you could experiment. typically, i've noticed auto cars really take off with a lot of overlap. a 110LSA cam with the same duration may peak 500 rpm earlier, but, the midrange is stronger. with autos, that just seems to be fast. at the same time you would have more lope and it wouldn't be as cruiser friendly, also would never pass emissions
Last edited by racebum; Aug 9, 2014 at 04:09 PM.
Thread Starter
Intermediate
Joined: Jul 2003
Posts: 32
Likes: 0
From: carrollton tx
Race Director
Joined: Jan 2008
Posts: 16,028
Likes: 170
From: oregon
i wouldn't sweat trying to chase every last hp. if you want to do that the sooner you buy turbos or a supercharger the better
so much goes into drag racing, especially with an auto, your stall has a MAJOR impact on 1/4 performance, weather affects everyone.
are you happy with how the car feels? that's what really matters.
Pro
Joined: May 2014
Posts: 670
Likes: 46
From: Indiana
Seems a little light to what my car just did on a Mustang dyno last month - 380 rwhp @5250, 383 ft-lbs @4600, which is supposed to read about 10% less then a dynojet. I bought the car at a Mecum auction so not sure about cam specs - but it sure doesn't sound like a stock cam. Stock heads, Weiand/Lingenfelter intake manifold, long-tube headers, guessing corsa indy pace car exhaust. When I bought car had a dorked-up computer tune - car was running leaner than stoich at WOT. I at least got it richer than that but dyno wideband showed it at best around 14.0 during the run. I've since of course dialed in more WOT fuel so it may be a bit stonger now. During the run injector duty cycle peaked at 90% so I don't have a lot more there to go with those injectors.
Race Director
Joined: Jan 2008
Posts: 16,028
Likes: 170
From: oregon
Seems a little light to what my car just did on a Mustang dyno last month - 380 rwhp @5250, 383 ft-lbs @4600, which is supposed to read about 10% less then a dynojet. I bought the car at a Mecum auction so not sure about cam specs - but it sure doesn't sound like a stock cam. Stock heads, Weiand/Lingenfelter intake manifold, long-tube headers, guessing corsa indy pace car exhaust. When I bought car had a dorked-up computer tune - car was running leaner than stoich at WOT. I at least got it richer than that but dyno wideband showed it at best around 14.0 during the run. I've since of course dialed in more WOT fuel so it may be a bit stonger now. During the run injector duty cycle peaked at 90% so I don't have a lot more there to go with those injectors.
would be careful until you get that sorted out
Pro
Joined: May 2014
Posts: 670
Likes: 46
From: Indiana
When I got the car it had the Long Term Fuel Trims turned off, and the short trims were running into the positive teens pretty much across the board. Going into Power Enrichment mode the computer doesn't do the short term trims so it was running quite lean at WOT due to that, and the Power Enrichment added fueling tables seemed a bit on the light side as well. First things I did to the tune included turning the long term fuel trims back on and adjusting the MAF calibration to get them running a bit on the negative side. After seeing the 14.0 and up on the dyno I've added a bit more to the MAF calibration in the higher airflow region and added about another 10% more extra fueling in the Power Enrichment added fueling table. Not sure where it's at now but should be well down into the 13s for AFR or lower.
Racer
Joined: Apr 2011
Posts: 328
Likes: 12
From: frankfort new york
first i would definitely call out the bottle neck!!!!!! 30# injectors!@#$%
you are starving it for fuel imo i'm running 60# injectors on 7lbs of boost and my tuner says i am at my limit and could actually use bigger injectors or upping the fuel pressure.
secondly question on dyno results and some of the responses what does gear ratio have to do with power results??? i would think that 3.73's and 4.11's would have the same h.p. and torque numbers???? i understand having heavier wheels making a difference being more mass but how would gear ratio effect h.p. and torque???
and if it does make a difference would making the dyno pull in 4th gear 1:1 or 6th gear that is like .5:1 make different readings???
you are starving it for fuel imo i'm running 60# injectors on 7lbs of boost and my tuner says i am at my limit and could actually use bigger injectors or upping the fuel pressure.
secondly question on dyno results and some of the responses what does gear ratio have to do with power results??? i would think that 3.73's and 4.11's would have the same h.p. and torque numbers???? i understand having heavier wheels making a difference being more mass but how would gear ratio effect h.p. and torque???
and if it does make a difference would making the dyno pull in 4th gear 1:1 or 6th gear that is like .5:1 make different readings???
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Pro
Joined: May 2014
Posts: 670
Likes: 46
From: Indiana
That's a good point - he's needing more than 30# injectors to see his target hp or quite high fuel pressure feeding them. Did the dyno not record AFR???
Racer
Joined: Sep 2006
Posts: 314
Likes: 0
Ok so I took the car to the northstar dragway (1/8 mile) in denton,tx last night. Here are the results. Keep in mind that this was my first time drag racing on a track.
pass 1
60' - 2.0372
330' - 5.4452
1/8 ET - 8.1955
1/8 MPH - 88.76
pass2
60' - 2.0051
330' - 5.4009
1/8 ET - 8.1340
1/8 MPH - 89.5
pass 3
60' - 1.9727
330' - 5.3682
1/8 ET - 8.1071
1/8 MPH - 90.4
Do these numbers correspond with Dyno results and mods?
Thanks for all the replies!
pass 1
60' - 2.0372
330' - 5.4452
1/8 ET - 8.1955
1/8 MPH - 88.76
pass2
60' - 2.0051
330' - 5.4009
1/8 ET - 8.1340
1/8 MPH - 89.5
pass 3
60' - 1.9727
330' - 5.3682
1/8 ET - 8.1071
1/8 MPH - 90.4
Do these numbers correspond with Dyno results and mods?
Thanks for all the replies!
Thread Starter
Intermediate
Joined: Jul 2003
Posts: 32
Likes: 0
From: carrollton tx
Thread Starter
Intermediate
Joined: Jul 2003
Posts: 32
Likes: 0
From: carrollton tx
OK so I have an update and a couple questions.
As suggested by most on this thread.....
Replaced my stock MAF with 01 Z06 MAF
Replaced 78mm TB with 90mm LS2 TB.
I was wanting to beef up the Cam a bit more.
Im looking at the Texas Speed magic stick (3) 237/242 111 LSA.
Will also be swapping the stock stall converter for a yankSS 3600
Upgrading fuel pump to either the Racetronix model#(????) or LPE fuel pump
replacing 30# injectors with 39#-42# injectors.
Should these mods mesh well with my other mods? Is the magic stick 3 considered a "big" cam? Any better recommendations? Im really not concerned about fuel mileage/ emissions/ or comfort, just BIG POWER and Lower track numbers and being able to drive it on the street (comfortable or not). I prefer the opposite of sleeper.
Thanks in advance for any help!
As suggested by most on this thread.....
Replaced my stock MAF with 01 Z06 MAF
Replaced 78mm TB with 90mm LS2 TB.
I was wanting to beef up the Cam a bit more.
Im looking at the Texas Speed magic stick (3) 237/242 111 LSA.
Will also be swapping the stock stall converter for a yankSS 3600
Upgrading fuel pump to either the Racetronix model#(????) or LPE fuel pump
replacing 30# injectors with 39#-42# injectors.
Should these mods mesh well with my other mods? Is the magic stick 3 considered a "big" cam? Any better recommendations? Im really not concerned about fuel mileage/ emissions/ or comfort, just BIG POWER and Lower track numbers and being able to drive it on the street (comfortable or not). I prefer the opposite of sleeper.
Thanks in advance for any help!
Burning Brakes
Joined: Feb 2005
Posts: 1,201
Likes: 14
From: Honolulu, HI
OK so I have an update and a couple questions.
As suggested by most on this thread.....
Replaced my stock MAF with 01 Z06 MAF
Replaced 78mm TB with 90mm LS2 TB.
I was wanting to beef up the Cam a bit more.
Im looking at the Texas Speed magic stick (3) 237/242 111 LSA.
Will also be swapping the stock stall converter for a yankSS 3600
Upgrading fuel pump to either the Racetronix model#(????) or LPE fuel pump
replacing 30# injectors with 39#-42# injectors.
Should these mods mesh well with my other mods? Is the magic stick 3 considered a "big" cam? Any better recommendations? Im really not concerned about fuel mileage/ emissions/ or comfort, just BIG POWER and Lower track numbers and being able to drive it on the street (comfortable or not). I prefer the opposite of sleeper.
Thanks in advance for any help!
As suggested by most on this thread.....
Replaced my stock MAF with 01 Z06 MAF
Replaced 78mm TB with 90mm LS2 TB.
I was wanting to beef up the Cam a bit more.
Im looking at the Texas Speed magic stick (3) 237/242 111 LSA.
Will also be swapping the stock stall converter for a yankSS 3600
Upgrading fuel pump to either the Racetronix model#(????) or LPE fuel pump
replacing 30# injectors with 39#-42# injectors.
Should these mods mesh well with my other mods? Is the magic stick 3 considered a "big" cam? Any better recommendations? Im really not concerned about fuel mileage/ emissions/ or comfort, just BIG POWER and Lower track numbers and being able to drive it on the street (comfortable or not). I prefer the opposite of sleeper.
Thanks in advance for any help!
BTW my stock 02 z06 injectors were slightly over 80% duty cycle at 450rwhp.
Advanced
Joined: Aug 2014
Posts: 61
Likes: 2
From: Alabama
Stock stall with a cam that size is why your car feels lazy coming off the line. You aren't getting in your power band as quickly as it should be. BTW I have that exact cam in my C5Z my car made 455rwhp but it started with ~50 more HP than you did. So your #'s are where they should be.
STALL the car and it will be a whole new car.
STALL the car and it will be a whole new car.
Safety Car
Joined: Aug 2011
Posts: 4,447
Likes: 409
From: Portland OR
If it follows commanded AFR through out the rpm range, you are "ok". But I agree 28 lb/hr is not quite enough.
I have LS2 in mine which are 33lb/hr and I get just past 90% duty cycle.
Good move on the TB, MAF and esp the Yank 3600.
That will completely wake up the car.
Don't touch the cam.
For comparison. My car has AFR 205 heads, smaller 226/230 114 cam, same TB/MAF, Fast 102 intake, Yank-me SS3600 with 3.42 gears and runs bottom 11's in cool air. Best of 10.99@123.7.
1/8 best is 6.99@100
Have fun! And do let us know how she does!
Ron
I have LS2 in mine which are 33lb/hr and I get just past 90% duty cycle.
Good move on the TB, MAF and esp the Yank 3600.
That will completely wake up the car.
Don't touch the cam.
For comparison. My car has AFR 205 heads, smaller 226/230 114 cam, same TB/MAF, Fast 102 intake, Yank-me SS3600 with 3.42 gears and runs bottom 11's in cool air. Best of 10.99@123.7.
1/8 best is 6.99@100
Have fun! And do let us know how she does!
Ron
Drifting
Joined: Sep 2009
Posts: 1,719
Likes: 4
From: cinnaminson n.j.
St. Jude Donor '14
If it follows commanded AFR through out the rpm range, you are "ok". But I agree 28 lb/hr is not quite enough.
I have LS2 in mine which are 33lb/hr and I get just past 90% duty cycle.
Good move on the TB, MAF and esp the Yank 3600.
That will completely wake up the car.
Don't touch the cam.
For comparison. My car has AFR 205 heads, smaller 226/230 114 cam, same TB/MAF, Fast 102 intake, Yank-me SS3600 with 3.42 gears and runs bottom 11's in cool air. Best of 10.99@123.7.
1/8 best is 6.99@100
Have fun! And do let us know how she does!
Ron
I have LS2 in mine which are 33lb/hr and I get just past 90% duty cycle.
Good move on the TB, MAF and esp the Yank 3600.
That will completely wake up the car.
Don't touch the cam.
For comparison. My car has AFR 205 heads, smaller 226/230 114 cam, same TB/MAF, Fast 102 intake, Yank-me SS3600 with 3.42 gears and runs bottom 11's in cool air. Best of 10.99@123.7.
1/8 best is 6.99@100
Have fun! And do let us know how she does!
Ron
100%. Listen to Ron! His set up isn't radical, it just works, really well!