GIAC vs Cobb - same car same day
 

I just ordered an AP.

I'm hitting the drag strip on Sunday to run my GIAC Stage 2+ first and then install the AP and run it right after.

Unfortunately it's only an 1/8mi strip but I should get some good real world results.

One downside is my SC2s didn't come in so I'm still running the crappy P zeros. So I won't be getting incredible 60' times or anything but I'm most interested in trap speed differences. I will probably try running without LC to keep the tire spin to a minimum.

I told Mitch if the Cobb shows better I'll keep it otherwise I'm sending it back.

Do you think 1/8 mile is enough? I think your numbers are going to be almost identical given such a short distance.

Not if the dyno numbers and your experience running sdg's car says anything. The increased torque should be evident

But I also just picked up a vbox and will do some 1/4mi runs with it on the GIAC first and then the AP later at the same location.

/subscribed

Awesome. Subscribed. About time since the other thread is a mess.

I cannot wait to see your results. So you will be running the Cobb stage III then

That's a good idea. I have already done that and the FVD still has the better result. The problem is that the FVD run was taken in December when the temperature was about 70 and the recent run was taken with the temp being 88 so it's not apples to apples.

The first two are with the FVD on the county road and the last one is the best one I got day before yesterday with the Cobb. However, that run had really high IATs and there was knocking and timing pull above about 95mph.

What is really interesting about those runs is that the two FVD have better 60ft times but the speed at 60ft is lower than the Cobb. On the Cobb tune the 60ft speed is about 41mph while the two on the FVD module are below 40mph at 38 and 36. Pretty strange too because the slower 60ft FVD run has some obvious TC intervention around 30mph in the first 60ft but the car still runs a 130mph trap speed which is faster than either of the other two runs. Pretty sure this is going to be attributed to the outside temps being 65-70 and thus much lower IAT.

My experience at Atco was that running without launch control did not work in the cold morning at all. Made my times worse is I just spun more. In the afternoon when the temperature warmed into the 70s and the Ontrack temperature was probably in the 80s or 90s my fastest runs were definitely without launch control because the tires hooked better. That is when I was getting multiple 10.3's[

You honestly won't see a large difference in the 1/8 at WOT between the 2 if looking at time slips. If anything the COBB tune would prob be worse 60' with around the same 1/8 mph because of the additional torque. Good luck either way. Stick with what suits you and your car better.

Do 60-130mph runs also, thats good example of power... Also the trap speed you get on the 1/4mile will be a good indicator.

Good Luck :)

well UPS sucks.

the AP is supposed to be delivered this morning and I check the tracking at about 10:50 and it says, we tried to deliver it at 10:45 and you weren't home.

I'm like, I've been sitting here all morning looking out the window waiting for the guy.

not only that, I already pre-signed the release so he could leave it without a signature.

so the guy obviously just didn't want to make the drive and phoned it in like I wasn't here. bull****.

so I call them and they don't want to do anything for me because everything is closed on Sat. they say it will come Monday. I say that's not acceptable since he never even came to deliver it today at all.

I finally got to a supervisor who's going to try to track down the driver and have him redeliver today. but I'm not holding my breath.

can't believe the shadiness.

Sucks

Sorry to hear that. Happened to me with a certified check that was overnighted on a Thursday. Didn't wind up getting it until Monday and they pulled the same exact crap that no one was home. Meanwhile my wife, kids, and about 12 contractors have been home every day. Super frustrating.

well, the supervisor called me and said she was going to arrange for me to pick up the box at my local distribution center today.

then never called back.

great.

so can't do my test tomorrow at the drag strip.

that really blows.

I did go out today and did some runs with my Vbox.

unfortunately it was raining earlier, so the roads were too wet to launch.

nothing but tire spin in first gear, wouldn't hook at all.

but I did some 60-130 tests.

7.57s is my baseline, but it's slightly uphill.

but I will run the same location with the Cobb later.

Damn! I really want to see these results.

What are your mods right now?

Oct 30 I will run the 1/4 mi strip with GIAC and then install and run the Cobb.

That's the next opportunity at the track.

well, so I ran this track.

it's definitely uphill, so times were much slower than I expected.

also their trap speed indicator was severely miscalibrated.

it was giving me 118mph in the 1/8 mi which is way too fast.

my speedo topped out at 106 and even that is higher than actual speed.

so I had fun, but it was a pretty worthless experiment overall.

1.57 was my best 60' and that was with obvious wheel spin on the P-zeros.

6.822 was my best 1/8mi.

Subscribed! Look forward to seeing your result!

alright, well, some updates.

I'm running the Texas mile next weekend. I had been on the fence about whether I wanted to put SC2s on my car just for this event and testing and then take them off and hang onto them until I do a track day.

but I finally decided that it's only 2k and I really want to see how the car performs with proper tires.

so I called a Porsche dealership in Houston and had them order the tires. I will pick up my car next weekend and take it to the dealership to get the SC2s installed before I head out to Beeville for the event.

my plan is to run a few times with the GIAC Stage 2+ race tune and then install the AP and run with the Cobb Stage 3 100 oct. I will likely also send some logs to Mitch and get a custom tune and run that.

now I don't think they have gear to measure anything but trap speed at the 1mi, but I will run my Vbox and collect that data as far as 60', 1/8, 1/4, etc, which is better than nothing.

then depending on what I see with the Vbox and 1mi trap speed, when I get home I may go get the GIAC Stage 2+ flashed back onto the car and take it up to the 1/4 mi drag strip and run there with it and then install the AP again and do the same thing.

You rock. Thank for you doing this for the community. Cannot wait to see the results

They give you 1/2 mile and 1 mile times. You have to run some slower passes in order to get qualified for the fastest pass. The reason for the slower pass is so you get used to the stopping distance. They don't have a lot of room to stop and guys doing 200+ have chutes. That guy Tito that I was showing in the 1/4 mile video on my thread told me that he ran his GTR at 215 and says doing the second half is scary at those speeds and he used a chute. He says once he did a 200+ run, he wasn't going to do it again and stayed under 200 after that.

That's an awesome plan. Good luck, looking forward to the results!

Have fun!

Agreed!!!

Shifter, who did you use to do the transport? I am looking for someone. thanks

Ray's transport. They have a storage location in Houston so I can pick it up and drop it off whenever and they arrange the transport when it works for them.

Much cheaper than a dedicated hauler for the week.

so I'm headed out there tomorrow.

unfortunately the weather is not looking good for the weekend.

my plan was only to run a few times Friday and then install the AP.

however, it's looking like it's going to be tough to run back to backs as there will be limited runs available in between rain.

we may not even be able to run at all Friday or Saturday.

if that's the case, everyone will be trying to run Sunday, which will make it packed and hard to get multiple runs to do testing.

unfortunate that last week's weather was perfect and next week's will be as well.

just bad timing.

Sounds like the same kind of crap weather we deal with most of the time down here in FL. I feel your pain.

At least you don't have to deal with sub-zero temps and tons of snow/salt! :mad:

Yeah, I bought two 3 day Turn 1 Grandstand passes for F1 and it's looking like we get the same rain here Friday and Saturday. :mad:

But we need the rain.............

Well so far no good news.

No rain this morning but still delayed for 3 hours to dry the track from a light sprinkle overnight.

Finally get going and run for about an hour and a half before a huge thunderstorm comes through and dumps 3in of rain and shuts everything down.

I was about 30 min from running my first run which has to be a qualifying run in order to go over 165mph.

More storms are on the way this afternoon so today's pretty shot and tomorrow is going to be storms all day.

The only hope is Sunday but it's going to be packed since 3/4 of the field still hasn't run yet.

I need at least 5 runs to do my tests and there's no way I will be able to get that many waiting 2 hours per run.

https://cimg5.ibsrv.net/gimg/www.6sp...0690be53e0.jpg

It was feeling great but had to back down at the half because they had my training wheels on for the first run.

Was really hard after waiting all day long to finally get a run.

Hoping to get another run tonight but rain is in the forecast so seems unlikely.

https://cimg5.ibsrv.net/gimg/www.6sp...fbf4e9fd2d.jpg

I was the 4th person ever to run the Texas Mile at night.

Pretty crazy seeing the red lights at the end flashing at 180mph and feeling like you're on top of it but it's actually 1/2 mile away.

This was with a terrible DA into a 13mph head wind.

I'll run again Sunday in awesome conditions and hopefully break 195.

That's scary fast. I never had mine over 170 but I haven't been to an event where there was enough length to do that. I missed the spring mile after I paid for it and I missed the Houston 1/2 mile event after paying for it. I paid for USGP and it's not happening today because of rain and the afternoon part of yesterday was rained out. Hope tomorrow is good weather.

Tomorrow is looking great!

62 degrees with 22mph tail wind.

And the rain should subside overnight so they can prep the track and get us running decently early in the morning.

My plan is to run once more with GIAC Stage 2+ Race and then install the AP while I'm waiting for my second run and run with Cobb Stage 3 100 octane.

Then I'm going to see about sending logs to Mitch and getting a custom tune sent over for a third run.

My best estimate with the conditions is that I may push 195 with GIAC.

If Cobb can get me over 200 I'll be converted for sure.

While this is nice and thanks, for me it still isn't apples to apples. Too much time between the runs, you not familiar with the track, or should I say you would inevitably get better/faster as the runs go on with or without the change.

I would have liked to see true back to back to back runs to compare. Same temps, same track conditions, same car, same driver skill and comfort. The only things that changes in the tune back and forth. That to me is what is going to settle the GIAC vs Cobb once and for all. Who I am kidding, it won't but it would be closer to accurate.

Same car, same driver, same track, an hour apart isn't good enough?

Shrug.

If you don't like it, don't tune in.

I know for sure COBB will do better, but somebody will say some excuses and the story will repeat himself lol