Low track times our of SLP ZL585

[DandD]

Another vote for doing the data logging. With that speed the car just about can't be making the horsepower stated. I have a Jannetty tune on my 2010 ls-3 with LT headers and CAI so I should be making 410-420 rwhp (never been dynoed). On the stock Pzero tires at normal psi my best is 13.007 @ 112.81 and thats with a 2.207 60' time, the stock tires will just not hook. The point being that even with the added weight of your car if it is making the HP stated your mph should be a bit higher for sure. I am interested to know if you can give your 1/8 mph on those runs.

[SUX2BU]

Originally Posted by DandD

Another vote for doing the data logging. With that speed the car just about can't be making the horsepower stated. I have a Jannetty tune on my 2010 ls-3 with LT headers and CAI so I should be making 410-420 rwhp (never been dynoed). On the stock Pzero tires at normal psi my best is 13.007 @ 112.81 and thats with a 2.207 60' time, the stock tires will just not hook. The point being that even with the added weight of your car if it is making the HP stated your mph should be a bit higher for sure. I am interested to know if you can give your 1/8 mph on those runs.

Post the slip of you still have it. There is a lot more information on it that can help figure our relays going on than just the 1/4 ET and mph.

[obzidian]

A timeslip would help. Is the clutch driving/feeling fine? Your car should be closer to 120mph, if not more so something is up.

A datalog would definitely help.

[Smkymts]

Originally Posted by Smkymts

I have collected and sent off 4 sets of data logs to Ted and SLP for review. Awaiting their analysis. stay TUNED!

I must first state that my local track is closed for the season so I found a long peice of road closed to the public and cut off due to new highways. The public was not in danger.
The tempature was 63 degrees, a lot cooler. But we have had rain here for over a week and a lite snow last weekend. So data logging was postponed, but did not want to wait any longer so, I data logged on a day after a rain with the road still damp. That being said, this is what SLP said:

Thank you for getting this data to us. We have reviewed the data and all appears to be running well. Ignition timing is as programmed, knock retard is zero and running temps are as expected for ambient conditions. Using this data with the dyno numbers you provided us shows no issue with the car at this time and under these conditions.

As we discussed on the phone this is as expected due to the fact these data logs were recorded on the street and not at the 1/4 mile track where you believe there is an issue. As we discussed we will need you to perform a data log while at the 1/4 mile track. Preferably the track where you had your low times under the same hot and humid ambient conditions. Also, as we discussed you can call me on my cell phone from the track if you have the ability to send a data log while you are there. I will be able to view and give you instant feedback on any possible issues.

SLP is committed to all of our customers on any and all possible issues. We take all customer complaints serious and use all of our engineering resources and background to find and fix any possible issue as quickly as possible. If your car has an issue we will find it and if caused by our parts or build process we will repair it. If there is an issue and is not caused by our parts or build process we are still committed to helping you get the 1/4 mile times that will be satisfactory to you.

As always please contact me anytime.

Thanks
Hank

[Smkymts]

Originally Posted by Smkymts

I have collected and sent off 4 sets of data logs to Ted and SLP for review. Awaiting their analysis. stay TUNED!

I have been extremely lucky to have two great tuners look at the logs and share thoughts. Here is the conversation:

Ted's thoughts are in black, SLP's responses in Red

More than likely the car still has the factory map sensor that caps at 120 KP a or just over atmospheric pressure. – Correct so recording MAP on a ECM data logger will not help determine belt slip, or overall boost pressure.

You would need a ZR1 3 bar map sensor and a tune for it, to log boost.– correct, add to this - the back of the supercharger has the ability to hook up a boost gauge if you would like. Also this can be done on a dyno and the boost can be hooked up to the same location and recorded through the dyno sensor box. This will give you the ability to load the car on the dyno to find the exact point at which you may or may not have belt slippage. Performing a ¼ mile pass and different WOT runs in different gears on a dyno (under a road load test) is also a quicker way to find a possible belt slip issue. Dyno shops like SLP have the ability to move 30-35mph air over the car during runs which helps in cooling and more realistic results but, performing the above tests on the dyno typically yields higher IAT and higher ECT which you will not see at the track which also helps track down any possible running issues.

I see very High IAT given the conditions which pulls timing so I suspect Air in the intercooler system or some problem with Flow or Air flow to the heat exchanger.From your data log I show a high of 52 and a low of 32 on the IAT sensor. No timing is being pulled at these IAT temps. Also I have the ability to look at the ignition timing table that is in your car and you are getting max timing when you are in WOT which in your logs is not very often.

I also Suspect Belt Slip which can be rectified by adjusting the tensioner and Idler pulley, they should be only a 1/4 inch apart at Rest. – If there is belt slippage making the tensioner tighter will help, but internal extensive SLP testing at the 6-7psi boost level on LS3 and L99 camaros only shows belt slippage after getting into 5th gear. The slippage is minor and the vehicle will only loose 0.25 psi when the tension on the belt is correct.

The Tune looks really good from what I can see in the LTFTs and the Timing.

I guess that means I will have to wait until Spring to collect real Track data. I would like to know all the fields I need to collect, since the ones outlined in the above video are not enough? Any thoughts??

[Smkymts]

Originally Posted by obzidian

A timeslip would help. Is the clutch driving/feeling fine? Your car should be closer to 120mph, if not more so something is up.

A datalog would definitely help.

I will look for them. I was so embarressed the first time I threw them away. You would too with 14s.

[Falundir]

As promised. I'm mostly stock, and very new to both stick and the strip...

Important Stats:
Car weight with me in it (aprox 4,300lbs) - SS Convertible
Mileage - 3,250
Total time I have spent driving stick - 3,250 miles...
RWHP via Dynojet 377.40hp/383.46tq

Best run technique: Slipping clutch at 1800rpm, tires at 22psi (stock tires)

Best Slip: Sacramento Speedway 11/23 19:49

Reaction: .655
I1: 2.339
I2: 6.042
I3: 9.042
MPH I3: 83.665
I4: 11.557

E.T.: 13.645
MPH: 107.022

More details here ---> http://www.camaro5.com/forums/showthread.php?t=184193

[SUX2BU]

For what it is worth, I mentioned this thread to my tuner a couple of days ago. He said from what he has noticed, all the SLP cars and almost all other "performance package" blower cars that offer a warranty have tunes that leave a LOT on the table. Obviously they have to warranty the car so they put VERY safe tunes in them. So much that if the car gets heat soaked from running at the track the tune goes so limp that it is probably only making 400 hp at most. That would definitely explain decent dyno number but then it falls on it's face at the track.

[lewylew]

I am sure they put somewhat of a safe tune in, but the car should still run. As I posted earlier my SLP car ran consisted 11.95 with stock tune from SLP.

Originally Posted by SUX2BU

For what it is worth, I mentioned this thread to my tuner a couple of days ago. He said from what he has noticed, all the SLP cars and almost all other "performance package" blower cars that offer a warranty have tunes that leave a LOT on the table. Obviously they have to warranty the car so they put VERY safe tunes in them. So much that if the car gets heat soaked from running at the track the tune goes so limp that it is probably only making 400 hp at most. That would definitely explain decent dyno number but then it falls on it's face at the track.

[yotaman96]

I hope you get this figured out.

Btw, the title should read "high track times".

Good luck to you.

[2SSRSinBama]

looking at what I ran with a L99 with basically NO mods(stock tune, etc.), I'd be pissed if I were you, lol

[waahehe94]

I've seen your Pace Car at Bristol several times this year racing in the DER Series.You race in the Trophy class with one of my friends.Not wanting to sound insulting becuase your car is nice, but I always thought that it was stock with maybe a cold air kit and exhaust from the times that you ran.

I pit up on the hill in the yearly rented spaces for the campers and trailers and have watched your car from there make 1/4 mile passes.You don't seem to have any trouble at the starting line and seem to hit all of your shifts and your car doesn't look like it has any issues going down the track from what I've seen.

If you would scan and post a timeslip so that people can see your 60', 330', 660' and MPH, 1000' and 1320' and MPH it would help to get an idea of what is going on during your passes.Have you ever used a weather station while racing at Bristol?They can give you some good real time info and corrected info as well as make predictions about what your car will run from round to round based on previous recorded information.

Have you ever let anyone else race your car at Bristol to see what kind of times they could run with it or to get their opinion on how it runs?I know that you've stated that you have previous dragracing experience with your Turbo Saturn but I know that I personally couldn't switch from the car that I race every week to another car with a different type of transmission and horsepower and torque curve and drive it as well, especially at Bristol with the uphill slope that it has on the starting line.

[casper sc/1ss/rs]

pm me i have some hp tuner scans at bristol and other tracks down south, you might be interested in the times there is nothing wrong with your car the rear tire is to tall and 1st gear is to tall in these cars for the weight but theres a simple fix

[Smkymts]

[QUOTE=obzidian;4059773]A timeslip would help. Is the clutch driving/feeling fine? Your car should be closer to 120mph, if not more so something is up.

Since many have doubted what i said and have asked for track slips, here is what I found from that same day. I could not locate the best time slip I ran that was reported in the opening of this thread but as you see those times make since when you see these.