G5X4 numbers
06-08-2005, 06:38 PM
#1
G5X4 numbers Car: 2002 Z28, TH350, ATI 8" converter, 12 bolt w/ 4.10's, LS6 Intake, Bauer TB, ASP Pulley, FLP Longtubes, 3" True Duals w/ x-pipe, 27" QTP's at 25psi.
Tune: I did all the part throttle tuning myself. I'm far from a pro and my methods are outdated. I have LS1Edit so I never touched the VE tables so I'm not sure how much power I'm leaving on the table. Basically, I rescaled the IFR table for my SVO 30# injectors, adjusted the MAF table to bring LTFT's to slightly negative and raised timing to 30. I got some help doing the WOT tuning on the dyno today but all we messed with was the PE vs. RPM table to try to shoot for a AFR of 12.9.
First two pulls were 337 rwhp @ 6400 RPM.
I almost fainted. My car made 343 with just bolts ons! I was ready to drive my car off a cliff. I don't know what happend on those two pulls but the next three read much higher. The only changes we made were to tire pressure. I think we bumped up the psi from 18 to 25 (it was actually only 22 when I checked it after we finished).
We ended up making only five pulls because LS1Edit kept losing its connection while uploading to my PCM.
I thought I fried my PCM the first time it did it. From the 4th to the 5th pull we only gained 1 rwhp so we left good enough alone.
Here's the fifth pull:
http://img.photobucket.com/albums/v6...erZ28/Dyno.jpg
Here's the number breakdown with AFR readings:
http://img.photobucket.com/albums/v6...terZ28/AFR.jpg
Nothing to brag about but this was on a dyno that is known to be 10 to 30 rwhp lower than other dynos in our area. Also, today was 97*F. They are SAE numbers though so the numbers are corrected for the crappy conditions.
I was a little surprised the horsepower peaked at 6400 rpm. By 6700 it was falling fast. I guess I'll shift at 6700.
I know Magnus and 01-Z made 413 rwhp with the same set up as mine but they have the LSX intake and TB, worth about 10-15 rwhp. So that still leaves me a little short but I think with a better tune and on a different dyno my numbers probably would be a lot closer to 400.
This Friday we'll see what the drag strip numbers have to say. I was hoping for high 10's but it's so hot and humid here I think low 11's would be good for these conditions. 10's might have to wait till Fall.
Tune: I did all the part throttle tuning myself. I'm far from a pro and my methods are outdated. I have LS1Edit so I never touched the VE tables so I'm not sure how much power I'm leaving on the table. Basically, I rescaled the IFR table for my SVO 30# injectors, adjusted the MAF table to bring LTFT's to slightly negative and raised timing to 30. I got some help doing the WOT tuning on the dyno today but all we messed with was the PE vs. RPM table to try to shoot for a AFR of 12.9.
First two pulls were 337 rwhp @ 6400 RPM.
I almost fainted. My car made 343 with just bolts ons! I was ready to drive my car off a cliff. I don't know what happend on those two pulls but the next three read much higher. The only changes we made were to tire pressure. I think we bumped up the psi from 18 to 25 (it was actually only 22 when I checked it after we finished).We ended up making only five pulls because LS1Edit kept losing its connection while uploading to my PCM.
I thought I fried my PCM the first time it did it. From the 4th to the 5th pull we only gained 1 rwhp so we left good enough alone.Here's the fifth pull:
http://img.photobucket.com/albums/v6...erZ28/Dyno.jpg
Here's the number breakdown with AFR readings:
http://img.photobucket.com/albums/v6...terZ28/AFR.jpg
Nothing to brag about but this was on a dyno that is known to be 10 to 30 rwhp lower than other dynos in our area. Also, today was 97*F. They are SAE numbers though so the numbers are corrected for the crappy conditions.
I was a little surprised the horsepower peaked at 6400 rpm. By 6700 it was falling fast. I guess I'll shift at 6700.
I know Magnus and 01-Z made 413 rwhp with the same set up as mine but they have the LSX intake and TB, worth about 10-15 rwhp. So that still leaves me a little short but I think with a better tune and on a different dyno my numbers probably would be a lot closer to 400.
This Friday we'll see what the drag strip numbers have to say. I was hoping for high 10's but it's so hot and humid here I think low 11's would be good for these conditions. 10's might have to wait till Fall.
06-09-2005, 08:27 AM
#6
The ones that Matt recommended, Comp 26921 Springs, Comp 7.4 Pushrods. Installed dot to dot.
Do the torque numbers look ok or do they seem kind of low?
Keep in mind this is on a dyno that always reads low compared to other dynos and this is on my shitty tune. I'm sure a good tuner could have got at least another 10 rwhp out of it. I was expecting somewhere in the 390's and peak power to be around 6700.
Do the torque numbers look ok or do they seem kind of low?
Keep in mind this is on a dyno that always reads low compared to other dynos and this is on my shitty tune. I'm sure a good tuner could have got at least another 10 rwhp out of it. I was expecting somewhere in the 390's and peak power to be around 6700.
Last edited by PewterZ28; 06-09-2005 at 08:50 AM.
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06-09-2005, 01:02 PM
#8
Running 30.5 timing. I posted my gears and tires in the first post. 
4.10's and 27" QTP's at 22psi.
The O2s were doing some really funky stuff. The first two pulls when it only dynoed 337 rwhp the 02s were steady around .920 to .940 from 5000 rpm all the way to 6900 rpm. But then on the last three pulls instead of staying at a steady reading they were increasing with the RPM all the way up to above 1.0.
For example:
RPM......O2
5400....0.910
5600....0.920
5800....0.930
5900....0.940
6000....0.950
6100....0.955
6200....0.960
6300....0.970
6400....0.980
6500....0.990
6600....1.000
6700....1.010
6800....1.020
It is somewhat comforting to see that you also did not have big torque numbers. I was worried I had weak hp and tq curves in addition to lower than average peak numbers. But from what you are saying your numbers were, it sounds like this cam's strength is peak horsepower. We all know what you and Magnus have run with this cam so I'm going to wait until I get some track numbers before making any judgements about this cam.
I really do think with a better tune and a different dyno my peak number would be in the 390's.
4.10's and 27" QTP's at 22psi. The O2s were doing some really funky stuff. The first two pulls when it only dynoed 337 rwhp the 02s were steady around .920 to .940 from 5000 rpm all the way to 6900 rpm. But then on the last three pulls instead of staying at a steady reading they were increasing with the RPM all the way up to above 1.0.
For example:
RPM......O2
5400....0.910
5600....0.920
5800....0.930
5900....0.940
6000....0.950
6100....0.955
6200....0.960
6300....0.970
6400....0.980
6500....0.990
6600....1.000
6700....1.010
6800....1.020
It is somewhat comforting to see that you also did not have big torque numbers. I was worried I had weak hp and tq curves in addition to lower than average peak numbers. But from what you are saying your numbers were, it sounds like this cam's strength is peak horsepower. We all know what you and Magnus have run with this cam so I'm going to wait until I get some track numbers before making any judgements about this cam.
I really do think with a better tune and a different dyno my peak number would be in the 390's.
06-09-2005, 03:31 PM
#9
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Get it to the track and that will tell the story.
I agree with you that this cam has been running the #’s
How much difference does slicks make compare to streets tire on the dyno?
I agree with you that this cam has been running the #’s
How much difference does slicks make compare to streets tire on the dyno?
06-11-2005, 08:18 PM
#10
Update
I found "part" of the problem. Pulling out of my subdivision on my way to the drag strip I heard something flapping around in my wheel wells. I get out and look at my rear tires and I see strips of rubber hanging off on the inside corner of the tires. One of the tires has a 1/8" cut in it all the way around the tire. I check clearance and sure enough there's less than 1 cm of clearance. My tires were rubbing badly! So I went back to my house, took off the rear wheels and took a BFH to the wheel wells. No more rubbing now.
Funny thing is I saw the smoke from them rubbing when we were dynoing but I didn't think much of it because I have seen tires smoke on the dyno before so I assumed that's what it was. I guess if something doesn't seem right you should always go check.
A few other positives. First, I figured out why my engine was overheating. The SSRA tunnel was falling off and completely blocking the radiator. I took it off and now I'm back to running 185*. Second, I have no problem making it to my drag strip without my new TH350 over heating. It stayed at 210 the whole way there. Third, with my new 2.75 first gear I can easily hook on the street now.
Now for the cons. That new 2.75 first gear that is allowing me to hook on the street has also completely ruined my sixty foot. I went from low 1.5x's to high 1.5x's. Second, the ATI 8" 4900 RPM converter hits like a 
Third, my 1/4 ET and MPH have only impoved about a tenth or two at most. I got a couple passes in and my best was a 11.36 @ 118.5. DA was 2000' though. My best with the C1 cam was 11.2x @ 120.xx in slightly negative DA.
So no more wheelies for me. I should have stuck with the 4L60E. I'm going to miss pulling the tires on the launch.
I found "part" of the problem. Pulling out of my subdivision on my way to the drag strip I heard something flapping around in my wheel wells. I get out and look at my rear tires and I see strips of rubber hanging off on the inside corner of the tires. One of the tires has a 1/8" cut in it all the way around the tire. I check clearance and sure enough there's less than 1 cm of clearance. My tires were rubbing badly! So I went back to my house, took off the rear wheels and took a BFH to the wheel wells. No more rubbing now.
Funny thing is I saw the smoke from them rubbing when we were dynoing but I didn't think much of it because I have seen tires smoke on the dyno before so I assumed that's what it was. I guess if something doesn't seem right you should always go check.
A few other positives. First, I figured out why my engine was overheating. The SSRA tunnel was falling off and completely blocking the radiator. I took it off and now I'm back to running 185*. Second, I have no problem making it to my drag strip without my new TH350 over heating. It stayed at 210 the whole way there. Third, with my new 2.75 first gear I can easily hook on the street now.
Now for the cons. That new 2.75 first gear that is allowing me to hook on the street has also completely ruined my sixty foot. I went from low 1.5x's to high 1.5x's.
Second, the ATI 8" 4900 RPM converter hits like a Third, my 1/4 ET and MPH have only impoved about a tenth or two at most. I got a couple passes in and my best was a 11.36 @ 118.5. DA was 2000' though. My best with the C1 cam was 11.2x @ 120.xx in slightly negative DA. So no more wheelies for me. I should have stuck with the 4L60E. I'm going to miss pulling the tires on the launch.
Last edited by PewterZ28; 06-11-2005 at 08:23 PM.
06-11-2005, 08:22 PM
#11
P.S. Can someone help me confirm that my 1st gear ratio really is 2.75 and not the standard 2.56? I'm worried Rossler may have forgot to put in the optional low 1st gear that I paid extra for.
I have 4.10 gears and at 6800 RPM I am going 47 mph in 1st gear. Anyone know how to compute my 1st gear ratio?
Thanks in advance.
I have 4.10 gears and at 6800 RPM I am going 47 mph in 1st gear. Anyone know how to compute my 1st gear ratio?
Thanks in advance.
06-11-2005, 11:11 PM
#13
So no more wheelies for me. I should have stuck with the 4L60E. I'm going to miss pulling the tires on the launch
Use the transbrake
with some more practice you'll get your 10.99 or better timeslip. I think everyone will agree you made the right choice with the TH350 
06-13-2005, 08:07 AM
#16
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If the DA was +2000 on your new runs it is already faster than your old setup Correct your old times (-DA) and your new times to 0' and I bet it will be faster
Here is a DA correction calculator if you need it: http://www.modulardepot.com/density.php
Correct your old times (-DA) and your new times to 0' and I bet it will be faster Here is a DA correction calculator if you need it: http://www.modulardepot.com/density.php
06-13-2005, 09:31 AM
#18
It was at Evans dyno in High Ridge, MO.
I'm not convinced that I got the 2.75 1st gear I paid for. If you plug in the numbers, it does come out to 48 mph at 6800 RPM in 1st gear. However, you have to consider 5~6% converter slippage. Friday, I was going 79 mph at 6500 RPM in 2nd gear (1.52 ratio). If you look at the chart, it says I should be going 84 mph at that same RPM and gear. So I lost 5 mph from converter slippage.
Now we can go back and apply that same 6% loss to 1st gear. 48 x 1.06 = 51 mph. Remember the chart said 48 mph @ 6800 RPM for a 2.75 1st gear ratio. So what does a 2.52 1st gear ratio say @ 6800 RPM? If it says 51 mph then we know I have a 2.52 1st gear ratio. Well, it says 53 mph.
So I don't know what to think.
Bain, you are correct.
DA was 2300' when I ran 11.36 @ 118.50.
So corrected to 0' equals 11.07 @ 121.55.
So let's say I picked up 2 tenths and 2 mph from my C1 cam to G5X4 cam swap. That was shifting at 6800 1-2nd and 6500 2-3rd. I don't have a shift light yet. So with better shifting and a better tune I could see 10.9's being possible in zero DA.
But I sure do miss that 3.06 first gear.
I'm not convinced that I got the 2.75 1st gear I paid for. If you plug in the numbers, it does come out to 48 mph at 6800 RPM in 1st gear. However, you have to consider 5~6% converter slippage. Friday, I was going 79 mph at 6500 RPM in 2nd gear (1.52 ratio). If you look at the chart, it says I should be going 84 mph at that same RPM and gear. So I lost 5 mph from converter slippage.
Now we can go back and apply that same 6% loss to 1st gear. 48 x 1.06 = 51 mph. Remember the chart said 48 mph @ 6800 RPM for a 2.75 1st gear ratio. So what does a 2.52 1st gear ratio say @ 6800 RPM? If it says 51 mph then we know I have a 2.52 1st gear ratio. Well, it says 53 mph.
So I don't know what to think.
I think your new times corrected to sea level would be somewhere around 11.1's @ 121mph with a slower 60'
DA was 2300' when I ran 11.36 @ 118.50.
So corrected to 0' equals 11.07 @ 121.55.
So let's say I picked up 2 tenths and 2 mph from my C1 cam to G5X4 cam swap. That was shifting at 6800 1-2nd and 6500 2-3rd. I don't have a shift light yet. So with better shifting and a better tune I could see 10.9's being possible in zero DA.
But I sure do miss that 3.06 first gear.
My sixty was a 1.8 on that run.