TUNED BY ALPHA JAG TUNING both pulleys, Ecu tune, trans tune, catless, alpha jag intakes, ported blower, meth kit although I didnt use meth this run and was tested on the street.

 

Impressive. How are you managing belt slip with both pulleys?

 

Yeah, that's pretty serious stuff! Congrats!

 

We tuned Nicks car. Non-issue with belt slip with proper setup

 

Belt slippage is a real thing and I’d love to see real world proper data logs that show no boost pressure loss under load or video evidence that proves otherwise.

 

Like I have said , we have no issues with our setup. Not sure why you think we should 😆 or why we should be trying to prove anything to you. We have fastest F-Type times on record and Underratedjag posted proof of his time.
This is our in house Ftype R runs consistently in the 10s and is the the fastest on dragy boards , haven't seen one faster anywhere else. Car has lower and upper pulleys, , intake , TCU and ECU tune. Stock exhaust, stock supercharger and stock tensioner NO Nitrous

 

I have watched other F-Type owners deal with this same issue for years. @TT_6SPD_95 car ran a 10.8 with similar bolt-ons and the stock tensioner setup several years ago (2022).

https://www.jaguarforums.com/forum/f...10-mph-263659/

His 10.89 at 130 mph is also a strong pass and shows what these cars are capable of with basic upgrades. That said, belt slippage is still a very real issue with the way JLR designed the belt routing for the supercharger system.

The upper pulley simply does not have a lot of belt wrap, and the entire system relies on a single spring tensioner. Once you start increasing the supercharger drive ratio with a smaller upper pulley or an overdrive crank pulley, the belt is being asked to transmit significantly more load than the factory system was originally designed for. I have watched live on a dyno the belt squealing and slipping on a pull with the same setup. When people actually data log these cars, what you often see is fairly consistent. Even owners on other AJ133 platforms openly discuss the issue with the belt slipping and trying to solve for it.

Boost will build through the lower RPM range, then you start to see drops or oscillations in boost as RPM climbs. In many cases airflow and load will fluctuate as well because the ECU is constantly trying to compensate. The thing is, a car can still run a strong quarter mile number while this is happening. A brief loss of boost late in the pull does not always show up in the trap speed or ET in an obvious way. But when you look at the logs, the drops are there.

Properly logged cars can show what is really taking place, rather than just an assumption a particular setup is exempt from it. As we all are looking to push what is possible with these cars, the more consistent data and understanding what is happening, will eventually result in advancements in what is possible.

 

Sure and that's the fastest any VAp car was ever to able to achieve, might want to double check DA at that track too, we run 10.7 on ours for comparison.

On pulley, Again we are talking about Alpha Jag Tuning setup not others (it's not same setup as VAP) yes we log and run our cars hundreds probably a thousand at this point when we test and develop just FYI 🧐 and no at this point we see no need for upgraded tensioner with our setup, running 10.7 , will do 10.5 with good traction.. But if you really want to buy upgraded tensioner you know which company to go with, case closed !

 

I'm interested in all the tuning options out there, but I don't know how one can claim no belt slip from their setup while another company's introduces slip. Slip is a result of the intersection of resistance for the charger to rotate and compress (boost), the amount of wrap on the pulleys, the total surface area of the belt where it contacts the pulleys, MAYBE to a degree the surface finish on the pulleys, and the condition of the belt. A different tune or something won't eliminate the issue, all other variables being equal.

Does Alpha Jag run less boost but more aggressive timing/fueling for equal or greater power at lower boost levels?

It's just an odd claim to make without understanding what differentiates, though it is interesting.

 

@71camaro There is actually a very simple explanation for this.

Many datalogging tools such as HP Tuners or the Torque app are limited to generic PIDs and operate at a relatively slow sampling rate. That means the data often lacks the clarity needed to properly identify transient events like belt slip. To address this, we developed our own logging tool that captures more than 40 engine channels at 8 samples per second, giving us a much clearer and more accurate view of what is actually happening in real time.

When we hear others say they are not experiencing issues, it is fair to question what data they are basing that conclusion on. In many cases the information they are looking at may be incomplete, not reporting the correct parameters, being interpreted incorrectly, or even worst, completely fabricated.

As we have continued developing solutions for this platform, we have also focused on bringing products to market that address belt slippage directly. With the 1900 blower it is not always an issue, but once you step up to the 2300 series blower an upgraded tensioner becomes a necessity. And again, the way we can identify this, is with proper data logging.

Others will make their own claims, but our approach is straightforward. We rely on real world data to support what we say and to validate the effectiveness of the supporting products we develop.

 

That has been a while back now! Just been out enjoying the car when I can as I am always busy with something it seems.

I had the dyno already scheduled for the following week after that 10.89 pass at the track in 2022 as I also was having my nephews car dynoed for his birthday as he had never dynoed a car yet. After going to the dyno that following week AP fine tuned the car and it gained a bit of power on the dyno with the fine tuning. That is also when the transmission tune got done and then I also did the high flow AP cats and lightweight battery but never was able to get around to getting the car back to the track for actual comparison testing. Honestly just been very busy with my business, my other cars, etc and even if I get a track day lined up somehow it can't be on a day that has different track temps, pressures, etc if I want to actually compare which is the whole point of going so I know what the mods actually did. LOL

It is just not easy lining up the track time for exact comparison and honestly I'm just out enjoying the car anyway racing it against many others. Haha I'm sure I will get the car back out to the track sometime soon to see what the extra fine tune on the dyno, transmission tune, lightweight battery and hi flow AP cats all did to the performance. I do know it is enough to surprise a Hellcat driver though. I'll have to link a video of that run sometime, but the owner was super cool and shocked at what happened. LOL

Our track here is at 1,381ft above sea level. Not super great, but not too bad either. I'm sure I will get a track day lined up sometime soon to see what the car will do with the extra mods that I never got to test.

 

TT_6SPD_95 Just because track is at 1300ft doesn't mean that's what DA was at, it could have been -1000 for example ,.as it depends on weather conditions as well and would give you a nice bump in power. Run a Dragy and you will know where your car is at now and you can post your results there, after all your the fastest VAP car!
It's interesting that Vap themselves ran fastest of 10.98 and no other Vap cars have faster result even with the mythical TVS2300.
Our AlphaJag Tuned car at 1300 DA did 10.88 so a little faster than your 10.89 this was while letting off gas at 1000ft mark for comparison

 

I never said that the DA was X amount...I was just simply saying what the track elevation is at. I know the DA can change with weather conditions, but low track elevation certainly helps to achieve good DA. I also didn't race in 40 degree temps either which again will help with DA. Either way, when I go back to the track to compare I will be comparing the same temps and such and all of that information is deep in my phone from years ago when I did the 10.89 with the car before the extra power dyno tune, etc that AP did. I will have to look all of the information up as I want to see what the little extra power on the dyno that AP achieved on my car, the transmission tune, the lightweight battery and the high flow cats. I am just curious as to what those modifications actually did and to know I have to make sure that the car is raced in the same temps and such. We don't get to race all year long or anything as the temps are consistently below 40 degrees for around 5-6 months out of the year, so we get to take Side by Sides in the snow and such. LOL

I also have a 1,500hp Supra, Twin Turbo Viper, etc, etc so am well aware of how much is actually left in a car that lets out at the 1,000' as I have been doing this for over 20 years and literally hundreds of times of trying to let off at the end so I won't get kicked out of race tracks all of the time. LOL

To answer your question as to why others are not doing these times...there is a lot of "driving" to this car if you want optimal times. If you hop in this car, simply put it in drive and just mash the gas pedal you are not going to get the best results...it will still be fast, but not the best ET. There are a lot of factors that play into achieving the best ET's in this car and honestly a lot of drivers of these cars are not really purist "racers" that look at every aspect of racing as it all matters if you want the best times and things like DA and track temp alone can change these little tenths of a second that are being talked about let alone everything else that goes into a good ET with this car.

Do you have any videos of your car going down the race track? Sounds like you have a really great running machine!! Keep it up and I'm sure you'll get it down lower and lower.

 

We ran that time at 1800FT DA on a dirty airport runway with no prep

[QUOTE=AlexJag;2905685and no other Vap cars have faster result even with the mythical TVS2300.[/QUOTE]
No-one has run a 1/4 mile with the 2300 kit yet. Be patient

 

Yes il post them on our YouTube channel soon! Actually il try to post them today. Stay tuned !

 

Do you have any runs down the track of your car when it was bone stock? I ran my convertible down the track for the first time ever 3 years ago and actually didn't get kicked out.