Harry's LapTimer Petrolhead

Harry's LapTimer Petrolhead application logo

Harry's LapTimer is the advanced tool for car enthusiast. It records all types of sensor data provided by your iPhone/iPod/iPad (or external sensors), combines them, and makes them available to optimize your drive. Over time, you will get insights on your car and in your driving, not known before.

LapTimer offers more than 1000 predefined tracks world wide. With its assistants, it is extremely easy to setup - just click your track and drive. It fully automates your lap timing using GPS, and presents the results to all kinds of media.

You are not limited to track driving only. For example, you may define your home and working locations as a 'track', collect statistics on different ways chosen, and analyze / optimize the time used every day.

Want to show your drive to your friends? LapTimer generates beautiful in car video recordings with all kinds of data overlaid, ready to be presented - e.g. on youtube. Even without video, recorded data can be analyzed using purpose designed views, making it easy to analyze and improve your driving performance.

Using online racing, you can use LapTimer in competition. LapTimer offers a Hall of Fame, allows watching you and your friends on track - all in real time. Compare your sector times, braking / acceleration points, and learn from each other.

You can start with your plain iPhone in the beginning and add external GPS and OBD II sensors later, step by step, and as you need it. LapTimer itself comes in three different editions: LapTimer Rookie is the entry level with all you need for lap timing; LapTimer Petrolhead is the advanced version including lots of video features, and LapTimer Grand Prix is the edition for professionals including Multi Cam recording, and advanced sensor and analytics functionality.

Please note that functionality depends on your device, the LapTimer edition chosen, and sometimes even external sensors added (like OBD II). Please visit our web page to get the full story. All edition can be upgraded later, all editions come with native iPhone and iPad support.

There are quite expensive stand alone solutions for track days available. Be smart and own the leading edge tool simply by using your iPhone and LapTimer. Besides the professional area, there is no known solution that offers more functionality than LapTimer does - across the market. As our ambition is to offer the best tool, LapTimer is enhanced continuously.

Please visit http://www.gps-laptimer.de for detailed information on versions, FAQs / documentation, in depth technology background information, online racing, and supported device configurations. Join our user community on http://www.gps-laptimer-forum.de to be involved in future development - all with first class support.

Harry's LapTimer Petrolhead App Description & Overview

The applications Harry's LapTimer Petrolhead was published in the category Sports on 2009-11-24 and was developed by Harald Schlangmann. The file size is 72.38 MB. The current version is 21.1.0 and works well on 7.1 and high ios versions.

‣ Improved iOS11 compatibility for video overlay and data recordings
‣ Fixed a mix up of sensor names (Custom OBD WiFi etc)
‣ Added BTLE Custom GPS sensor support
‣ Improved BTLE Custom OBD sensor support
‣ Added TONWON BTLE OBD compatibility
‣ Several other minor fixes and improvements

Harry's LapTimer Petrolhead App Tips, Tricks and Rules

Harry's LapTimer Petrolhead Reviews

anastasia in san diego

Great for big track, nearly useless for AX  anastasia in san diego  3 star

App always works great at tracks like Auto Club Speedway--times very close to official times, records every lap no prob. Very sporadic for AX--records laps arbitrarily, sometimes it works, other times inexplicably not recorded. I wouldn't pay $20 for it unless u track alot.


Best racing app  Kshcsnsidjsn837482  5 star

Awesome app, wish there was a way to cut off incoming calls while using it


Great lap time tracker  Interdigitate  5 star

Used it for the first time this past weekend and loved it. Only thing I would recommend is the ability to pause the time keeper or create sessions since everytime I clicked stopped when I came into the pits, I had to load the map again to start time keeping which was an extra step I don't think we should have to do.


Fix the darn app already  siberian7  1 star

So many bugs in each version/update! Now I can even add a 2016 Porsche cause it doesn't recognize it!!


Its great when it works.. But it does rarely do its job  Alienfriend.no.1  2 star

More bugs than a Motel 6!! And every update adds more of them. Have the app on the 6plus. Everytime i want to record the app crashes in the middle or just when i want to turn it off after the run. Im first time at sonoma with ZERO footage after trying to record for a full track day. It crashes and restarts the whole phone way too often. I cant erase videos because it crashed immediatly if i go in the housekeeping screen. It also crashes right after overlapping a video "succesfully".. If the app wouldnt be all that buggy it would be great.


The #1 accessory you can get to go faster on the track!!  aashishthakker  5 star

I kid you not- as a weekend track addict (I try and do about 6-8 weekends a year) I find Harry's Lap Timer to be the best investment I have made that has made me improve my times! Being able to capture consistent data points, sector/lap times and being able to overlay video (with MultiCam support of GoPro!) allows one to see where they are doing well and where one can improve. My favorite things about the app: * support for OBDII sensors * support for external GPS * support for multi cameras (iPhone, iPad and GoPro cameras) * in-device support for overlaying multiple videos, data points from sensors on to track map * ability to set a Reference lap and compare all other laps to it Only a fellow track addict can develop such an app - and it shows how well it's been written!


Best app out there for a weekend racer  Yotaswan  5 star

To say this app is anything less awesome is insane. In my opinion this has been the best purchase I have made from the App Store. The app itself has helped me to become a better driver at autocross events as well as hpde events at the local race track. It allows you to overlay data from sensors you have plugged into your car or phone that help create videos that blows my friends and family away. I highly recommend this app to any weekend racers out there. You will not regret it.


Excellent  NbJosh  5 star

The best timing app or AutoX and track days, and helped me win my first race by keeping me on pace for 20 laps

Andrew Khoury

Great functionality, UX needs work  Andrew Khoury  4 star

Fantastic app, very accurate lap times, and great telemetry data. The UX is pretty clunky and could use a design overhall.


Best track app!  rfgf1  5 star

I reviewed other versions of this app in the past, and this review is going to be more of the same praise. Harry's GPS Lap Timer provides as comprehensive a solution as the iphone can handle, performing much of the same functionality as the vastly more expensive dedicated timing solutions, requires virtually no setup at the track, and just flat works! Used the Petrolhead version at Indy Motor Speedway this past weekend (my 7th event this summer), and impressed my garage-mates with the timing and video the app produced. Additionally, I had a question over the weekend that I posed to Harry; he responded very quickly, and I was up and running for the next session. Brilliant app and fantastic customer service!


Great tool  keefoAus  5 star

This s the best money I have spent on my track day stuff. The lap timing is awesome out of the box and Harry just keeps adding new features. I've added external GPS and ODB interfaces and this adds even more to the data that is captured. Video feature is awesome cant wait to see what he adds next.


Motorsport fanatic  POgliani  5 star

Congratulations that's awesome app


Nice App but  ImFrozen  3 star

Installed this app after having a similar app installed that continuely crashed my phone. Feature set is great it has the race track I was on in it, but the lap times were out by about 10 seconds a lap, I was using the iPhone 4's built in GPS and it was a clear day, still I had fun :)


Ok  bomberdavec  3 star

I tried this at Broadford (Victoria) didnt work at all....showed laptimes varying form over 4 minutes to 30 seconds!!!! Would need to use with an external gps unit I think..will try at Phillip Island in AUgust hope it works better there.


Brilliant  racingspeed  5 star

This app really is brilliant. It works much better than expected. The times are within 1 tenth of a sec to a dorian. It can be roughly plot braking points and g forces during laps. Will show racing lines and can record video and overlay it with accelerometer and other data. It is really worth while.


Harry's Laptimer  gleesons  5 star

This is a fantastic app, i have told 6 pople that i race with about it and they all bought it, it is great, it has also been a good tool to help tune the race car itself, as the data collected helps to find areas of improvment. Best app i have purchased and would recomend it to anyone that goes to the track thats lookng to get more out of themselves and their car, THANK YOU HARRY!!!!


Amazing app!!!  TomMurray85  5 star

This is an absolutely essential app for the track day junkie and racers of cars and bikes. It gives accurate lap times and extensive data for post race analysis. Easy to use interface and track setup using GPS points set by the user. Supports OBD and GPS accessories for the more serious users. Very good support with constant updates - the developer is implementing what the customers want. This program replicates $1000 stand-alone GPS track timing systems for a fraction of the cost. As a motorcycle racer couldn't have asked for more. 


Works great!  VKMcVey  5 star

Yesterday was the first opportunity I had to really try this app at a Track Day. The download of the specific track worked perfectly. The video-capture and overlay worked perfectly. The GPS timing/accuracy was close to that of the readings from a $300 professional Lap Timer that was run simultaneously. I particularly like the video and speed, G's/angles, track-progress, split timers. Wow, it's great. One of the more expensive apps I've downloaded, but well worth it! Notes: Used on an iPhone 5. The windshield bracket I chose is not heavy-duty enough to prevent rattling -- will need something better next time.

James Sonne

Superb Dash Camera and more  James Sonne  5 star

I mainly use it as a dash camera on the street and it is fantastic at that. It has a focus lock feature to save battery life, and video recording can be starting with just a couple taps from the start-up screen. Video overlay processing takes some time and is all on the device. Processing cannot be done in the background and the device cannot sleep while processing, and it can take a bit of time to complete. Processed videos end up in your iPhone Camera Roll so they can transfer via iCloud or iTunes syncing. Also has some useful gauges, but I wouldn't mind seeing additional realtime gauges, especially instant fuel consumption. Some customization of the gauge display screen would be nice as well. These would just be cherries on top, overall this is an amazing value even for my limited use of its functions. A quality application.


Frequently at the track!  TrackWeekend.com  4 star

I love this app. but the last update messed everything up! Please fix so I can keep using it every time I go to the track! Please fix update!!!


Makes it so easy  spitfireracer  5 star

I beta tested this version for Harry. Integrating the OBD data makes doing lap videos with overlays a touch of the button. I use 2 blue tooth devices (GPS and Go-Point) and even use GoPro Hero2 video. Integrating with GoPro video is as simple as syncing on the end of the lap, and HLT does the rest. GForce maps tell me where I can go faster, and where I"m inconsistent on my lap segments Resident maps have worked at every track Ive been to in Ontario, Canada, and only adjusting for stop/go for the timing trigger is the only thing I need to do Others have reported issues in making the automatic triggers work and video recording. This version makes it easier to setup, so you should have less issues. Once you get used to it, and experiment with setup off the track, its a breeze. Highly recommend. Integrates a lot of what I want. Now if only Harry will create a data logger app so I can view engine performance on the track with GPS markers, life would be grand!


Please fix video  carpe41280  3 star

Harry, when i try to overlay my video the app freezes and then says the data is corrupted


superb  duc7480  5 star

ready to go tools. what i am mising is easy way of lap 2 lap on the computer comparison. i would like to compare several laps on the graph not only best & current


Best timing app on iPhone  Richarze  5 star

Best timing app on iPhone. Took a little time to read the online manual and forum will help you saving time setting things up at the track. This is the best timing app for iPhone hands down.


Best Use of an iPhone ever  Sam-ur-I  5 star

This combines every feature you could want in a track app using the iPhones sensors and cameras- beautiful video too


Outstanding  Joshuajmurray  5 star

On par with much more expensive systems and easier to use.


Data!  JonMR  5 star

Love this app. I'm just an occasional track goer, but this app gives me so much data. It did crash on me at the track, but the author took the time to repair/recover all my data for me. 👍

Harry's LapTimer Petrolhead Comments

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