Harry's LapTimer Petrolhead App Reviews

Hands down, the best bang-for-the buck in data systems. Well worth the price of admission... even if you have to purchase an iPhone.

Tons of functions, video is great. Ensure you have a charger and lots of storage space to capture laps with this app, amazing capabilities need power and room. Thank you Harry!

I just tried this app during a Grand-Am test at Road Atlanta and Im shocked and how well it works and how user friendly it is. This is my profession and I would recommend this app to anyone!

Had some user related errors on my part, but this thing is fantastic fun! With the addition of a GoPoint OBD device it gets even better. The learning curve isnt very steep though some patience is required, at least on my part. However, if you have any questions the support on the forum is exceptional…no, outstanding! I think Harry has a few clones because responses to questions and troubleshooting via forum is instantaneous. Thanks Harry!

I use this app to review my autocross runs during every event. The video with overlay is valuable info and very cool to watch! This app is a big factor in why I switched to iPhone. Works great with the recommended Dual XGPS150a, although an occasional reboot of the iPhone and GPS is needed, I think the external GPS is at fault but cant say for sure. Keep up the updates and great work.

Creat app. Has improved my lap times.

I have used this app at two different Colorado tracks. I had some set up issues but Harold was very responsive in helping me. My friends have some different apps and I think this is the best one.

I have been using this app, along with an external 5Hz GPS (XGPS150A). Lap times reported by HLT are within 1/100 of a second of my transponders. This app is so feature rich, Id easily pay double the price. Best of all, Harry offers the best support Ive ever experienced. He answers all my dumb questions. Hes reconfigured tracks (direction) for me within minutes. Hes always available on his forums. I guarantee no other track app is as feature rich as HLT, nor has the customer support to match Harrys.

This seems expensive for an iPhone app, but youre basically turning your iPhone into a $1000+ racing telemetry unit. I havent tried the video overlay function yet, but if it works as advertised, (and by all reports, it does so quite well...), youre getting the equivalent of a $2000+ system. Kind of a no-brainer. Costs roughly gas money for half-a-dozen laps around my home track. If I had ANY complaint at all, navigation through all the various feature menus is a touch confusing -- but I think thats mostly because this thing is so crazy packed with features that its hard to organize all of it into a logical format. If you look back at all the version releases, it keeps doing more and more. If he adds any more features, its liable to drive the car for you! Phenomenal app. If youve got an iPhone and even do one HPDE/PDX/Track Day, you should have already downloaded this thing...

The most irritating thing is that this seems to be the best app for this sort of thing. The user interface is some sick, cruel joke. The app locks up from time to time. The list of tracks truncated the useful information (Buttonwillow clockwise vs counter clockwise). The settings are impossible to understand. The problem is, if you can get it set up and working the results are brilliant. The overlay of the track map, accelerometer and speed over video are great. Unfortunately, you cant hit a button to automatically overlay ever lap, you have to manually go through and overlay each one. Adding insult to injury, the overlay settings are reset every time you go in to overlay, so you have to remember every time to reset the lead in and out to zero and disable that stupid count-down thing. Trying to load maps is an excercise in frustration. First of all, Im usually near a track when I want to load it, why not show me the nearby tracks? When tracks nearby have variants, the most important part of the track name is the part that differs (for Thunderhill, is this with the bypass or without? For Buttonwillow, is this clockwise or counter clockwise?). The track list shows the names and truncates the interesting bits. Tapping on the track usually results in loading the details page instead of loading the track.

...is the reaction I get everytime I show a track day video with overlaid data from this app. Really amazing what you can do with an iPhone. Do yourself a favor and play around with this *before* you get to the track. If you try to set it up for the very first time 15 minutes before the call to grid, it can be too much to take in. One of my favorite tracks (ORP) has very spotty cell service, so you need to have the track downloaded and selected before you get there. App works well as is with just a mount and a power cord, but Ive enjoyed adding a BT-1 OBDII link, a Dual GPS puck and an Olloclip wide angle lens to improve data capture and cockpit video.

I use this at Sebring and it is incredible. Captures excellent data, takes great video, overlays statistics on the video and is outstanding with the TomTom iPhone holder for attachment to the windshield. Could not be more satisfied...and a real bargin when compared to the hardware alternatives. Also, very easy to set up and use.

The app to have for track day data. Combined with a gopro, unless youre a hardcore racer, you have everything youd ever need. Harry is always available to contact for help or for you to suggest ideas. Anyone who cant figure out the interface more than likely hasnt taken advantage of the extensive resources available to help.

Ive been using various editions of Harrys for 3 years and have maybe 200 laps recorded at various track days. Let me say that this app has done wonders for my driving. Compared to just using a camera this gives you hard data about speed and cornering forces, and the camera gives you the line that you took. I consider this a must have for anyone serious about doing track days or autocross events. It does take some time to get familiar with and find the perfect mounting location for your phone, but once you get familiar with it the app is no more intrusive than a video camera when leaving the pits. Plus this app is being very actively developed, so I feel confident that the money I spent wont be wasted.

This app is one of the most amazing apps available for the iOS platform. The amount of functionality it provides eclipses what youd expect on a desktop application, let alone a mobile device. Bottom line is, if you want to record vehicle data, either on the track or street, and combine that with video, this app can drive it all. Issues? Harry maintains a great forum for his products and is extremely responsive. The amount he charges for these apps is a complete bargain.

This is both the most expensive app and the most impressive app I own. Harry had created something better than most expensive professional telemetry systems that cost $$$. Times using GPS, records videos, produces professional looking videos with overlaid data, all from one app. Highly recommend to maximize your fun at your next track day or auto cross. Happy driving!

I rely on this app for all track day events and it works extremely well. I have been pleased with all the telemetry and the ability to control my GoPro for 2 camera overlay video. Just be sure you have a mount that allows for good ventilation because your phone will get hot. I use one with "fingers" and even in 100+ weather the phone keeps running with video being recorded.

Is what we need for trackday use

This app does it all and a must have for any track day. Forget spending up to $1000 for a GoPro camera and data acquisition system then spending an hour integrating video with data. This does it all. An external gps mount is recommended for greater accuracy.

Im very happy with the app overall but when I delete a lap from the lap list it stays deleting forever, I have to exit the app and close it. Also I would like to see my mph in more spots of the track not just the ones it chooses to show me, Im using homestead miami speedway if that is of any relevance.