Auto TRex dyno. Low numbers?
07-16-2012, 11:01 AM
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Auto TRex dyno. Low numbers? I posted this in the wrong section and don't know how to move it so im posting it again here
Before I say anything I don't care what the car dyno's I just want to make sure I'm not leaving anything on the table. Car is a 98 z28. Mods are as followed
02 ws6 shortblock
Trex camshaft
853 heads
Ls6 intake with slp throttle body
Circle d 4000 converter
4.10 gear
1 3/4 headers with 3in y pipe with what looks to be 2.25 catback with hooker muffler
E85 tune
The car does have 3 degrees of timing pulled for nitrous
It has ran a best of 11.98 at 112 with a 1.67 60 foot but is consistent at 12.0 at 111 with a 1.64. This was with the old 3.73 gears. The car made 359/351 this weekend with the converter unlocked on a dyno jet. I've always thought the car trapped low speeds. Do the dyno numbers sound low for my setup?
Before I say anything I don't care what the car dyno's I just want to make sure I'm not leaving anything on the table. Car is a 98 z28. Mods are as followed
02 ws6 shortblock
Trex camshaft
853 heads
Ls6 intake with slp throttle body
Circle d 4000 converter
4.10 gear
1 3/4 headers with 3in y pipe with what looks to be 2.25 catback with hooker muffler
E85 tune
The car does have 3 degrees of timing pulled for nitrous
It has ran a best of 11.98 at 112 with a 1.67 60 foot but is consistent at 12.0 at 111 with a 1.64. This was with the old 3.73 gears. The car made 359/351 this weekend with the converter unlocked on a dyno jet. I've always thought the car trapped low speeds. Do the dyno numbers sound low for my setup?
07-16-2012, 02:13 PM
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I knew this was an issue when I first bought the car. Any ideas on what the car would gain ET wise if I were to take the catback completely off?
07-16-2012, 02:16 PM
#5
very small exhaust pipe diameter, try 3" or 2.5" duals ... also you're running 4.10 gears, that hides power on the dyno aswell. Being A4, you'll typically put down lower #'s than M6 cars.. you also said you have 3 degrees of timing pulled.
Those are quite a few things to consider before thinking you have low dyno #'s forsure. besides, i wouldnt be to worried anyways since every dyno reads different and is only a tool to use..
Those are quite a few things to consider before thinking you have low dyno #'s forsure. besides, i wouldnt be to worried anyways since every dyno reads different and is only a tool to use..
07-16-2012, 03:09 PM
#6
very small exhaust pipe diameter, try 3" or 2.5" duals ... also you're running 4.10 gears, that hides power on the dyno aswell. Being A4, you'll typically put down lower #'s than M6 cars.. you also said you have 3 degrees of timing pulled.
Those are quite a few things to consider before thinking you have low dyno #'s forsure. besides, i wouldnt be to worried anyways since every dyno reads different and is only a tool to use..
Those are quite a few things to consider before thinking you have low dyno #'s forsure. besides, i wouldnt be to worried anyways since every dyno reads different and is only a tool to use..
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07-16-2012, 08:13 PM
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I'm not sure if it's factory or not. It's pieced together though. Im certain it's not 3 inch that's for sure. The DA for the runs was around 2000-2200. I keep check a lot when I'm at the track. Sounds like I need to look into some cutouts. Thanks for the input. I'm slowing changing things on the car. Also I'm running a 27 inch tire. Switching to a 26 would be benefitial I think as well
07-17-2012, 08:50 AM
#16
You will gain a good bit of performance going with a 3cam inch x pipe/duals, my ms4 car pulled so much better with the duals over the y pipe, also you have a max effort cam, any lil upgrades you can make will only help, fast intake/chris1313/17/8th headers/ also did you spray with those times? Are you running timing pulled with no spray?
07-17-2012, 09:55 AM
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These time are with 3 degrees of timing pulled for nitrous. On a 150 shot the car has gone 10.90 at 123 with a 1.54. My tuner told me the power loss from 3 degrees would be minimal (5-10hp) so it would be more of a hassle to switch it back and forth for when I'm not spraying. So we left the timing pulled
07-17-2012, 11:40 AM
#18
These time are with 3 degrees of timing pulled for nitrous. On a 150 shot the car has gone 10.90 at 123 with a 1.54. My tuner told me the power loss from 3 degrees would be minimal (5-10hp) so it would be more of a hassle to switch it back and forth for when I'm not spraying. So we left the timing pulled
When you get to a certain point in the game, it can cost around 500-1k to try and squeeze out another 10rwhp from a setup. You have some power setting there FOR FREE, in the tune. It's well worth the time to re-flash the pcm to the file that's optimum for your N/A runs.
07-17-2012, 01:47 PM
#19
These time are with 3 degrees of timing pulled for nitrous. On a 150 shot the car has gone 10.90 at 123 with a 1.54. My tuner told me the power loss from 3 degrees would be minimal (5-10hp) so it would be more of a hassle to switch it back and forth for when I'm not spraying. So we left the timing pulled
