# F1 tuning claims 30% hp increase, 40% tq increase, you believe it? **URL:** \ **Category:** Shift518 Automotive\ **Created:** [November 26, 2010, 5:51pm UTC](https://forums.speedlife.net/t/f1-tuning-claims-30-hp-increase-40-tq-increase-you-believe-it/255754 "2010-11-26T17:51:31Z")\ **Posts on this page:** 1\ **Showing post:** 95
**Author:** ![Cossey](https://avatars.discourse-cdn.com/v4/letter/c/3ec8ea/32.png) [@Cossey](https://forums.speedlife.net/u/Cossey)\ **Post date:** [November 29, 2010, 9:42pm UTC](https://forums.speedlife.net/t/f1-tuning-claims-30-hp-increase-40-tq-increase-you-believe-it/255754/95 "2010-11-29T21:42:29Z")
> [@burnouts](https://forums.speedlife.net/t/burnouts/37603/19): > > Call me dumb, but I have no idea what you just did? I usually estimate a 20% loss in crank to wheel horsepower no? The f1 tune claims a 30% increase in horsepower, just to make it believable I only added a 20% CRANK hp increase which would be 58. 58 plus the existing 290 CRANK horsepower would be 348 CRANK horsepower which is how I came up with my number. Like I said earlier, I find it a pretty good sales techique to advertise crank horsepower when selling performance cars as is just looks better lol. Your car dyno’d 238whp today, so I used that figure. You need to remember that the 238whp is 80% of your crank horsepower, which is very different from adding 20% to get the number. I did cross multiplication (7th grade technique) to get the number of 297.5 crank horsepower, which would be the full 100% value. 80/100 = 238/297.5. Using your method (based on your dyno, not the dyno + claims from F1), you’d take the 238whp and multiply it by 1.2 (as in 120%, since 238 would be 100%, but you want 20% more for the crank hp figures). 238x1.2 = 285.6 crank horsepower. I’m not factoring in the 30% gains claimed by F1, and neither should you because it’d just be straight up lying to the potential buyer. Wait til you get a dyno number after the tuning and THEN figure out the real crank hp number. --- _[View the full topic](https://forums.speedlife.net/t/f1-tuning-claims-30-hp-increase-40-tq-increase-you-believe-it/255754)._