LS3 / ROTOFAB TRAC TEST RESULTS

[dragrcr]

I went to Fontana yesterday and I did my first full quarter mile runs on my Camaro. The car is 100% factory stock including the 35 PSI in the rear tires. 2500 miles on the odo. I have had my Rotofab intake system sitting here for 3 weeks all along knowing I was going yesterday and I really wanted to do a back to back comparison. So, I made 3 passes and I was very happy with the baseline, especially since I have the 6 speed manual tans. It is hard to get consistent runs.....
Then I changed the intake and went straight back to the staging lanes. I did not drive around to let the computer learn anything. Not sure if that would matter since the car is in open loop almost the whole run anyways. I never made any attempt to cool the motor down and the hood was closed almost the whole day. As far as ambient and track conditions, I would say that the worst conditions would have been around when the first Rotofab run was and I was about to make a run right after 5PM and it had cooled down quite a bit. But that did not happen as they sent us packing. Obviously the best conditions would have been the first run of the day. It was a nice sunny day with no wind.


#1 11:30 AM
60 2.289
1/8 9.029
MPH 83.17
1/4 13.667
MPH 106.84 Good clean run except 60 ft


#2 12:15 PM
60 2.194
1/8 8.92
MPH 81.50
1/4 13.622
MPH 106.24 Lame 2-3 shift


#3 12:49 PM
60 2.193
1/8 8.948
MPH 82.08
1/4 13.645
MPH 105.99 Good clean run, felt good

ROTOFAB INSTALLED


#4 2:31 PM
60 2.199
1/8 8.862
MPH 82.96
1/4 13.494
MPH 107.19 Good clean run, identical 60 ft as #3


#5 3:02 PM
60 2.182
1/8 8.874
MPH 81.89
1/4 13.577
MPH 105.74 Felt like car laid down for a 1/2 second right after shift to 3rd Still happy with that ET Daytime temp peaked on this run at about 75 deg (Going by display in car but it felt hotter).


#6 3:34 PM
60 2.321
1/8 9.121
MPH 81.82
1/4 13.811
MPH 106.19 Clutch pedal stayed down / did not release forcing me to pedal the car in first gear. This sucked because I really wanted to back up run #4, but still not a bad run considering.

[JohnInSoCal]

thanks for the info. The track was open on a friday ?

[dragrcr]

Originally Posted by JohnInSoCal

thanks for the info. The track was open on a friday ?

PSCA Event starts on Friday. Runs through the weekend. There was some crazy fast cars there!!

[Roto-fab 1]

It would have been nice to see the 5 o'clock run! It does look like you had noticable gains in spite of running the Roto-fab intake in the hottest part of the day. Thanks for posting the info!

[Roto-fab 1]

Dragrcr,
Based on your run description and run time, I am assuming run #3 and #4 are the best to use for comparison. Do you agree? It looks like the stock intake was loosing MPH with each run-probably due to ambient temperature rise throughout your testing.
Also, I am assuming there was a significant rise in temperature from run 3 @12:49 in comparison to run 4 @ 2:31. Do you happen to know what the temp difference was? Just curious.
Thanks for taking the time to post your results.

[GMRULZ]

Nice results. Don`t forget the more you spin at the line, usually means you will mph a little better than when you dead hook. At least thats been the case for me. #3 and 4 seem to be the best comparrison and looks like the rotofab is working great. By the way love your color combo......

[dragrcr]

Originally Posted by Roto-fab 1

Dragrcr,
Based on your run description and run time, I am assuming run #3 and #4 are the best to use for comparison. Do you agree? It looks like the stock intake was loosing MPH with each run-probably due to ambient temperature rise throughout your testing.
Also, I am assuming there was a significant rise in temperature from run 3 @12:49 in comparison to run 4 @ 2:31. Do you happen to know what the temp difference was? Just curious.
Thanks for taking the time to post your results.

I agree with you 100%, I was losing MPH as the day warmed up and run #4 probably would have been 105.XX So, realistically the car could have picked up about 1.5 MPH and .15 seconds in ET. I just wished I could have got another clean run that day to back up run #4. But it did not happen.

Everything here is good except run #5 was a little weird. It did feel a little flat going into 3rd gear which would explain the lower MPH, but the ET was still pretty good.

And even run #6 was trash except if you think about it 106 MPH is excellent for me pedaling it in first gear. I literally had to chop the throttle closed and then stab it back to the floor to get the clutch pedal to come up and the clutch to apply. This is a known problem that I wish someone had a fix for.

I was using the display in the car for temps and I did not look at it until run#2 and it read 72. On run #4 it peaked at 75, but it felt a lot hotter standing around and definately sitting in the car. But you have to realize the car was sitting and I am thinking that ambient temp display does not read right unless you are driving/moving. Every time I remembered to look at it the car was sitting. There was no wind at all.

[Roto-fab 1]

Thanks for the additional info! Even though we may not have the exact temps, it's good to know the Roto-fab intake gave you improvement in ET and top speed in spite of being tested at higher ambient temperatures than the stock system was ran at. I would rather see our system tested this way leaving no doubt it performs better than stock.

[bdg]

You did really well for your first time running the car. MPH doesn't lie, Roto-fab intake had the highest so it definately increased the HP. There is some threads in here telling how to prevent the clutch from sticking. I do not remember wear I seen them though.

[dragrcr]

Well, I was able to run at Fontana again yesterday and now I am more sure about my performance increase with the Rotofab intake. Keep in mind that this track is actual altitude of about 1100 feet and runs slightly uphill. Not sure what the DA was but I do not think it was that good since they were actually predicting rain at one time. BUT, It was cold. 58 deg on the ambient display. My car now has the Rotofab intake, Royal Purple Syncromax synthetic fluid in the Trans, a MGW shifter and the BMR Trailing arms (they don't work). I always run 35 PSI in the rear tires.

Anyhow, first run I was trying to do a lower RPM clutch slipping launch and the clutch hung up again and did not engauge properly. But, I know what to do now so it is a quick snap the throttle closed and then right back open and that takes care of it. I am thinking I might have done a 2.05-2.10 60 foot if that did not happen. Not bad at all considering my inability to do a high RPM clutch slipping launch.

#1 9:18 AM
60 foot 2.306
1/8 8.891
MPH 84.84
1/4 13.429
MPH 109.12

Hot lapped right back for a second run. This was a clutch dropped at about 2500 RPM with the usual wheelhop, hook & bog.

#2 9:31 AM
60 foot 2.293
1/8 8.918
MPH 84.11
1/4 13.486
MPH 108.68

I made a couple more runs that were throw aways. I tried the competitive launch mode and it hits the tires way too hard. My clutch works perfect if you just dump it and in that mode it is 4200 RPM. So.......VIOLENT wheelhop where the tires are off the ground 75% of the time. So I basically had to get completely out of it.
I also tried another run short shifting it at 5500 rpm which caused me to be in 4th gear for the first time ever. I think, based on incrimental times, the best thing to do would be to shift to second at 5800 and then to third at 6200 and finish in third. If I had drag radials I would say to shift at 6200 every time.

[Camar0wn3d]

I love seeing real world results. Thanks for posting. Also, I love your car.

[Exotic Performance Plus]

Awesome results with the Roto-Fab! It is a shame these cars are having problems with the clutch pedal hanging up. The Corvette ZR1's are having the same problems. Bob

[dragrcr]

Originally Posted by Exotic Performance Plus

Awesome results with the Roto-Fab! It is a shame these cars are having problems with the clutch pedal hanging up. The Corvette ZR1's are having the same problems. Bob

Keep in mind, my cluch pedal is not sticking. It works smoothly in every circumstance and never sticks. It is just something to do with the higher RPM and being released slowly. Like the throwout bearing gets cocked or hung up on the shaft and will not move or it gets hydraulicly locked or something. Could be my input shaft has some runout or more than normal. I have no idea. But I do think this is a different problem than the corvetts. It's not just a basic sticking problem. My clutch did this when the car was brand new and could not have had any clutch disc material contamination of the hydraulic fluid or components. It never once stuck in normal driving or if I release the clutch fast at ANY RPM. It just burns rubber (a lot).