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I had a chance to get out some Friday and push it hard with some ~launches (or fast acceleration) and I must say it feels much better and faster. Shifts are great, crisp, and smooth (and at the optimal shift points).
It ran great....BUT. I did a few 0-60 sprints, where I simply stopped, let off the brake, and pressed the pedal to the floor (not paddles...just let the car work)... and on about my 3rd one, it seemed to hit the limiter/or not shift? And I got a transmission failure of some sort (going to pull up SDD and see what the actual code was). So no biggie I figured, I LIMPED into a parking lot and turned off the car to restart it and clear limp mode...But no luck....It would not go into Park, and would not start...no matter what I did.
Thankfully, I had my laptop in the car and was using the MPV12 Flash tool to check out the data logging feature (I know I bought the VAP Datalogger...but wanted to see what HPTuner did also ). So I finally used the HPTuner Scan, and ran the DTC reader, and cleared the transmission (TCU) error...And it started right up and drove normally. I will see what is stored via SDD and add that here as well. It felt like, under hard acceleration, all was going fine, then it went into LIMP mode?
When this happened, I was in Dynamic mode, and Sport shift (Lever over to the left) and just accelerating...No paddles.
More to come. Other than that hiccup, it is a great addition and worth the money IMO. The calibration is how the car should have come from the factory.
DC
Thanks for the feed back. On my GTR if I get to aggressive with the tune on the trans it’ll cause faults from it trying to conduct an action before the previous one is completed. Same thing, just clear the fault and it’s fine.
Loving the VAP transmission tune so far. I’ll be posting 1/4 mile before and after results soon using Dragy. It is definitely faster with the TCU tune. Better shift points, quicker upshift/downshift, and raised RPM limiter.
Not going to blame this on the TCU tune, as I have no empirical data...But mine is still at the dealership with what I believe is a shredded Transfer Case after I added the TCU tune and did some 0-60 pulls.
And for the record, as soon as the dealer hooks up their software (SDD/IDS/Etc.), they can tell immediately that it has exceeded limits and has shift strategy changes, etc...That I can attest to.
Waiting for the bad news still, as it has been at the dealer all week. I was able to test drive with the level 5 technician who finally heard the grinding sounds and is checking in to it. They have been very gracious so far and trying to help which I appreciate...
Not sure what the refund situation may look like, but going to look into that, and doubtful I will re-install the TCU tune, as the change was marginal relative to the current potential $7,600 Transfer case (+ labor)!
Not going to blame this on the TCU tune, as I have no empirical data...But mine is still at the dealership with what I believe is a shredded Transfer Case after I added the TCU tune and did some 0-60 pulls.
And for the record, as soon as the dealer hooks up their software (SDD/IDS/Etc.), they can tell immediately that it has exceeded limits and has shift strategy changes, etc...That I can attest to.
Waiting for the bad news still, as it has been at the dealer all week. I was able to test drive with the level 5 technician who finally heard the grinding sounds and is checking in to it. They have been very gracious so far and trying to help which I appreciate...
Not sure what the refund situation may look like, but going to look into that, and doubtful I will re-install the TCU tune, as the change was marginal relative to the current potential $7,600 Transfer case (+ labor)!
I will update as I have more...
Enjoy your cars.
DC
So sorry you have to go through this headache. I hope you can get the car fixed soon. You definitely should get a refund from VAP at least.
unfortunately this is the risk we all take once we start modifying our cars. I'm not sure where you are located but if around Atlanta, let me know as I'd help you with the TC swap if you go that route.
I noticed that for the data VAP shared regarding the TCU tune and decreased trap times they tested using an RWD R. Since the AWD can leverage much more torque at launch, I wonder if DC found the weak spot in the system. A RWD can take only a fraction at launch before its melting tires.
So sorry you have to go through this headache. I hope you can get the car fixed soon. You definitely should get a refund from VAP at least.
Originally Posted by Craaaazzy
unfortunately this is the risk we all take once we start modifying our cars. I'm not sure where you are located but if around Atlanta, let me know as I'd help you with the TC swap if you go that route.
Originally Posted by ferrral
I noticed that for the data VAP shared regarding the TCU tune and decreased trap times they tested using an RWD R. Since the AWD can leverage much more torque at launch, I wonder if DC found the weak spot in the system. A RWD can take only a fraction at launch before its melting tires.
Hey, Thanks a bunch for the support guys. Still waiting to see what the Dealer says...And appreciate the offer to help(I currently live in IL..Yeay From New Orleans/Baton Rouge). I just bought another lift for ME for Christmas...so hope to get it set up when it warms a bit...MaxJax 2 post...
You may be on to something with the AWD vs RWD? Sucks, unfortunately...
I can confirm that the VAP TCU tune is 2/10ths of a second quicker in the quarter mile. The car is definitely more enjoyable to drive now.
Just be careful when manually shifting, if you try to bounce of the rev limiter at 7.5k rpms, the car shifts back to D mode on its own and makes a huge bang sound. Scary the first time I experienced that, but I guess the engine is just trying to protect itself. Normally you can bounce off the rev limiter all day if you wanted. Not anymore with the TCU tune.
Isn't going into decline dangerous for the engine ,just curious
I have been driving it hard every time I am in the car since it is not my daily. It’s held up great. No issues or misfires as of yet. VAP claims the increased rev limit is no harm to the engine or transmission. I did do fresh transmission fluid, new plugs gapped to .025, and regular maintenance. My car is 69k miles.
At 7.5K RPM on stock engine you are likely floating valves. To safely increase RPMs like this you would have to both blueprint (i.e. balance crankshaft and pistons) and put stiffer valve springs/titanium valves.
Unhingd makes a guest appearance in my latest video 😆
I hate to say it but I don't think that calculator you used in the video is correct. Your terminal speed of 109.74mph seems lower than I would expect for a car with 483hp at the crank.
My old 4.2 XKR was heavier than your F Type (curb of 3671lb v 3514lb) and in stock form with 420hp had an almost identical best terminal speed of 109.89mph so it stands to reason that your car must have less than 420hp as it is lighter.
My current 5 litre XKR in standard form achieved 115.73mph but after tuning, supercharger pulley and exhaust mods has done a best of 126.04mph.
I did calculations with your calculator based on a weight of 4215lb for my car (curb is 3865lb) and 126.04mph and that reckons my car has 790hp which is silly.
I normally use this calculator which looks the same as yours but produces quite different results. It makes my car 650hp which is far more likely.
If I put your numbers in to it I get 397hp which ties in with what I said earlier about my 4.2 XKR.
As mentioned, the best I got in stock form with my 5 litre was 115.73mph which with a weight of 4215lb gives 503hp which is close to manufacturer specs so the numbers it spits out seem about right.
I hate to say it but I don't think that calculator you used in the video is correct. Your terminal speed of 109.74mph seems lower than I would expect for a car with 483hp at the crank.
My old 4.2 XKR was heavier than your F Type (curb of 3671lb v 3514lb) and in stock form with 420hp had an almost identical best terminal speed of 109.89mph so it stands to reason that your car must have less than 420hp as it is lighter.
My current 5 litre XKR in standard form achieved 115.73mph but after tuning, supercharger pulley and exhaust mods has done a best of 126.04mph.
I did calculations with your calculator based on a weight of 4215lb for my car (curb is 3865lb) and 126.04mph and that reckons my car has 790hp which is silly.
I normally use this calculator which looks the same as yours but produces quite different results. It makes my car 650hp which is far more likely.
If I put your numbers in to it I get 397hp which ties in with what I said earlier about my 4.2 XKR.
As mentioned, the best I got in stock form with my 5 litre was 115.73mph which with a weight of 4215lb gives 503hp which is close to manufacturer specs so the numbers it spits out seem about right.
Thanks for sharing your results. I understand the numbers put out are just estimates and they can vary wildly. Still, 400 wheel horsepower is quite impressive for the V6. My main purpose in my 1/4 mile video was to compare the times between stock transmission tune and VAP transmission tune. I’ll also take the car in for some dyno testing to get true numbers soon.
Still, 400 wheel horsepower is quite impressive for the V6.
It is indeed but VAP claim 450bhp for the pulley and tune so with the other changes you have made I would expect you to be near the 480 you quoted so I wonder if you need to get the tune adjusted to take in to account your other mods. Your ET should be over 115mph then and sub 12 secs standing quarter.
It is indeed but VAP claim 450bhp for the pulley and tune so with the other changes you have made I would expect you to be near the 480 you quoted so I wonder if you need to get the tune adjusted to take in to account your other mods. Your ET should be over 115mph then and sub 12 secs standing quarter.
I am pretty sure VAP means 450 horsepower to the crank, not the wheel. BHP and WHP are quite different.
Here is what VAP themselves got on their 1/4 mile run with pulley, tune, downpipes and intake. They did not have the VAP transmission tune like I did so my time is slightly quicker. rank, not the
I am pretty sure VAP means 450 horsepower to the crank, not the wheel. BHP and WHP are quite different. .
I know and that is what manufacturers also quote.
Originally Posted by sparayno1
Here is what VAP themselves got on their 1/4 mile run with pulley, tune, downpipes and intake. They did not have the VAP transmission tune like I did so my time is slightly quicker.
This German magazine tested their standard V6 S and got similar figures so those look pretty close to stock:
I am pretty sure VAP means 450 horsepower to the crank, not the wheel. BHP and WHP are quite different.
Here is what VAP themselves got on their 1/4 mile run with pulley, tune, downpipes and intake. They did not have the VAP transmission tune like I did so my time is slightly quicker. rank, not the
VAP testing their V6 S F Type with crank pulley, stage 2 tune, 200 cell downpipes, and intake.
. Here is what VAP themselves got on their 1/4 mile run with pulley, tune, and intake. They did not have the VAP transmission tune.
That test car was a RWD F-Type S with auto trans in Mexico, 20C and 5000DA
The best mod dragy run, for that day = 12.70@110.2mph, with more wheel slippage we averaged 107-108mph. The video was near end of our tests and sc was getting hot, wouldn't be surprised if we had large amounts of spark correction.
The best stock dragy run = 13.21@106.71mph, with more wheel slippage we averaged 103-104mph.
At that time we did not have adequate datalogging, therefore we don't have any data recorded for IAT after intercoolers + spark correction per cyl.
Both of the runs would generate wheel spin, mainly because DSC/TC was turned off to avoid any type of manipulation/handicap.
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________________ Christopher Edgett Technical Director Velocity Automotive Performance Limited 214 Maple Ave. Oliver, BC Canada V0H 1T9 Office Tel: (250) 485-5126 www.VelocityAP.com Tuning@VelocityAP.com
12-06-2020, 02:56 PM
). So I finally used the HPTuner Scan, and ran the DTC reader, and cleared the transmission (TCU) error...And it started right up and drove normally. I will see what is stored via SDD and add that here as well. It felt like, under hard acceleration, all was going fine, then it went into LIMP mode?
