went to the test and tune tonight...
#1
went to the test and tune tonight...
It wasnt ideal weather for the track (martin US131), but i wanted to see how it runs out. Before i got inline i spectated and saw what i thought some fast cars turning 14s... so that changed my expectations some.
First pass
2.1 60'
14.7@101mph
missed 2nd gear
Second pass
2.2 60' launched at 3k and bogged really bad
13.8@104.9
actually pretty happy with that considering how slow others were running. No power shifting, bad launch -- im pretty sure if i drove it hard and got a 1.9 60' id be a real low 13 at maybe 106. I dont like to beat on my car so i decided not to make any more passes.
I was shifting at 6500, but every shift drops me out of my optima power band. damn long gearing...
For point of reference, my 2000 trans am with intake, full exhaust, cam did 14.1@101mph at this track. then a few weeks later at mid michigan ran 12.8@110mph.
First pass
2.1 60'
14.7@101mph
missed 2nd gear
Second pass
2.2 60' launched at 3k and bogged really bad
13.8@104.9
actually pretty happy with that considering how slow others were running. No power shifting, bad launch -- im pretty sure if i drove it hard and got a 1.9 60' id be a real low 13 at maybe 106. I dont like to beat on my car so i decided not to make any more passes.
I was shifting at 6500, but every shift drops me out of my optima power band. damn long gearing...
For point of reference, my 2000 trans am with intake, full exhaust, cam did 14.1@101mph at this track. then a few weeks later at mid michigan ran 12.8@110mph.
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Hi. Where you from? I go down there once in a while. Mid-Michigan has always been a faster track for me but it's twice as far away (been towed home twice from there ). Even with the heat your traps are extremely low for your listed HP. I was trapping 113-115 at that HP level and 104-105 stock. Heat will kill a few MPH but shouldn't that much. I'm waiting for it to cool down a bit before I head out there again.
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Not bad man. I like to see other GTO's numbers. I am going to Norwalk to test my set up. Hoping for good weather and good hook up. As for beating on it, I have feelings for my car and feel bad for it when I gun it, but its an addiction for me. Good looking GTO.
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Hi. Where you from? I go down there once in a while. Mid-Michigan has always been a faster track for me but it's twice as far away (been towed home twice from there ). Even with the heat your traps are extremely low for your listed HP. I was trapping 113-115 at that HP level and 104-105 stock. Heat will kill a few MPH but shouldn't that much. I'm waiting for it to cool down a bit before I head out there again.
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That's where i run. I'm fortunate to live within 20 minutes of the track. It's supposedly one of the best tracks in the nation. Very good track prep and gives every driver a great chance at hooking up. Maybe we could get a group of gto guys together to go that day. Would be cool to meet up with some of the fellow gto members.
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I think your times will get better with more practice. I used to run my car quite often at the track and my first 4 outings or so were way below my expectations.
I stayed with it and as my driving got better my times dropped.
Couple of the things that helped me the most were finding a good launch RPM and using a good tire that works for your driving style.
Keep your clutch bled regularly too if you are an M6.
No matter what your times are its just good to get out there and have fun!
I stayed with it and as my driving got better my times dropped.
Couple of the things that helped me the most were finding a good launch RPM and using a good tire that works for your driving style.
Keep your clutch bled regularly too if you are an M6.
No matter what your times are its just good to get out there and have fun!
#7
Hi. Where you from? I go down there once in a while. Mid-Michigan has always been a faster track for me but it's twice as far away (been towed home twice from there ). Even with the heat your traps are extremely low for your listed HP. I was trapping 113-115 at that HP level and 104-105 stock. Heat will kill a few MPH but shouldn't that much. I'm waiting for it to cool down a bit before I head out there again.
The ninja is blistering fast once the tach passes 11,000 rpms... .but getting it to 11,000+ takes some time. My GTO and ninja share two things in common. Peaky up top power band and super long gearing. This makes launching really hard because i either spin to much or bog really bad. I know the track is stickier then the street but i was shocked that i really didnt get ANY wheel spin launching at 3,000 rpms. car fell right on its face, then here i am at 3000 rpm making around 200hp instead of 390.
I was shifting at 6500, im not sure where the tach falls after that , but my peak power is around 6300-6400... so im guessing it falls to around 5k ? where im making 360hp or less.
The car weighed 3850 with me in it, 00 trans am was 3750. removed spare tire, 1/4 of gas
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#8
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I recently put 3.91 gears in my 05 and they really woke the car up.
I agree with you that the gearing in the GTOs from the factory is a bit long- or at least optimized for a lighter vehicle.
Just an idea,
I agree with you that the gearing in the GTOs from the factory is a bit long- or at least optimized for a lighter vehicle.
Just an idea,
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That's where i run. I'm fortunate to live within 20 minutes of the track. It's supposedly one of the best tracks in the nation. Very good track prep and gives every driver a great chance at hooking up. Maybe we could get a group of gto guys together to go that day. Would be cool to meet up with some of the fellow gto members.
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3.91 gears are the best, I was told that is perfect for the GTO if you between 400-550hp, 4.10 gears are pointless. I like to have them in my rear i just have 3.46
#11
How are the 3.91 on the highway? i really like the stock gearing for trips and so on. about 1800 rpm in 6th at 70mph. makes the car quiet and im getting 24mpg+ highway.
My GTO is a daily driver first, so i am really hesitant to swap anything that makes it less friendly daily driver
My GTO is a daily driver first, so i am really hesitant to swap anything that makes it less friendly daily driver
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I guess it may show that torque is more important than peak HP. These LS1s have very strong torque down low before they start getting messed with. I know that now when I look at a dyno graph I look a lot more at the torque. HP is just a derived number from measured torque. Torque is what pushes you back in the seat (acceleration). A flat torque "curve" will feel like the same push back in the seat through the whole band.
Something just doesn't sound right with your car. You might have had a happy dyno. You should be trapping 6-8 MPH faster. The cam selection with your heads may be giving you a good peak HP but poor torque curve? The exhaust affects lower RPM torque too a bit if you've changed that. I have 3.91 gears now and they are fun on the street but I don't think they make a big difference at the track outside of having to shift a lot quicker.
Something just doesn't sound right with your car. You might have had a happy dyno. You should be trapping 6-8 MPH faster. The cam selection with your heads may be giving you a good peak HP but poor torque curve? The exhaust affects lower RPM torque too a bit if you've changed that. I have 3.91 gears now and they are fun on the street but I don't think they make a big difference at the track outside of having to shift a lot quicker.
#15
Could be a happy dyno.
I am looking at the sheet right now. 360tq from 3000rpm to about 4500 where it goes up to 370ish. at 5252 it starts to head down. by 6200rpm its at 325-330tq
edit. Also on the dyno graph, it looks like when i shift into 4th gear im making about 310hp. I dont start making 390hp until 132mph (4th gear) I think gears would make a big difference to keep me in my "peak power" Would be ideal if my 4th gear ended at like 116mph instead of 135
I am looking at the sheet right now. 360tq from 3000rpm to about 4500 where it goes up to 370ish. at 5252 it starts to head down. by 6200rpm its at 325-330tq
edit. Also on the dyno graph, it looks like when i shift into 4th gear im making about 310hp. I dont start making 390hp until 132mph (4th gear) I think gears would make a big difference to keep me in my "peak power" Would be ideal if my 4th gear ended at like 116mph instead of 135
Last edited by LS14Winter; 08-06-2012 at 04:09 PM.
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I'm just saying that because I've seen quite a few time slips from different GTOs and know around where a given HP will trap. Frankly trap speeds (with DA) say way more than a dyno number. My first dyno was a happy dyno and read about 50 HP too high. Your peak HP isn't the place you accelerate the fastest. Peak torque is where you are. You'd like to shift near peak HP and drop down to at or just below peak torque. Peak HP is usually near the top and your car's acceleration is starting to slow down there (your torque line in trailing down). When you look at a dyno graph your acceleration rate follows the torque curve. Like I said HP isn't ever measured but is a derived number. The dyno measures torgue through acceleration. The formula is HP= (RPMxTQ)/5252. If you do the math and move things around you'll see why TQ and HP always cross at 5252 RPM.
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I think your times will get better with more practice. I used to run my car quite often at the track and my first 4 outings or so were way below my expectations.
I stayed with it and as my driving got better my times dropped.
Couple of the things that helped me the most were finding a good launch RPM and using a good tire that works for your driving style.
Keep your clutch bled regularly too if you are an M6.
No matter what your times are its just good to get out there and have fun!
I stayed with it and as my driving got better my times dropped.
Couple of the things that helped me the most were finding a good launch RPM and using a good tire that works for your driving style.
Keep your clutch bled regularly too if you are an M6.
No matter what your times are its just good to get out there and have fun!
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