chuyler1
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- New Hampshire
- chuyler1
There have been a lot of questions about what parts are more important than others with performance point racing. For the most part, I tend to just pick things at random trying to get close to the PP level without requiring power reduction. However I got curious as to whether I could get more out of choosing one part over another and decided to create a spreadsheet.
The following is a base Lancia Delta with each part installed separately to record the increase in power, torque, and performance points. The last 2 columns show how much hp or torque you get per performance point added.
https://spreadsheets.google.com/spr...5udHJwZzYtYWVPZjlyNGJMZGp1Vm9nenc&output=html
Max Power Build
It's pretty obvious that if your goal is to have max HP you'll want to install the high rpm turbo. It gives you 1.85hp per performance point which is greater than any other part. It also gives you that power in the high rpms where you will likely spend most of your time. The ECU upgrade, something I previously overlooked is also very good. It gives you an extra 200rpm to your redline and has a decent hp/pp ratio. Also good performers are the Exhaust and Intake manifolds, which should be selected before adding an exhaust. A surprise is how poorly the air filters perform. This is typically the first thing I install but apparently they simply aren't worth the performance points.
N/A Build
If turbos aren't your thing, there are several parts which will give you a higher redline and should be utilized on engines that have outstanding high rpm power. Start with the ECU and then go straight for the racing exhaust. The Sport Cat will help stretch the RPMs too but you'll get more hp from intake and exhaust manifolds so there may be some experimenting to do there.
Torque Build
I haven't had much luck with maximizing torque but if you want to run super tall gears and make use of that low end grunt, start with a low or mid rpm turbo. After that, go with the intake and exhaust manifolds and a racing air filter.
On the track
I ran two builds in my Lancia, one with a mid-rpm turbo and a second with the high-rpm turbo. The track was Deep Forest Reverse which has moderate straights including one that is uphill. Both builds were set for 450pp. Believe it or not, I was running inside a 1-2 10th window with both builds. The high-rpm build would gain time on the front straight and slowly lose it over the course of the lap. The mid-rpm build did very well on the uphill portion of the track and would get a good exit speed on the last turn and run almost neck and neck with the high rpm build until a few hundred feet before the start finish. One clear difference between the two was shift points. With the mid-rpm turbo I was shifting very early, around 6,000 rpm. With the high-rpm turbo I was shifting around 6,500. I didn't run to redline with either of the builds so someone driving an automatic would be at a great disadvantage in this car. I may try again to mix up the parts to get a build that is more automatic friendly.
Concusion
I don't want to get into the benefits of torque vs hp, but I think this quick analysis shows that some parts are better than others depending on what your goal is. Picking parts that yield the most hp or tq per pp will give you a slight edge over the competition. I didn't see outrageous differences in lap times but each track is different, and fine tuning the transmission to work with the resulting hp/tq curves will help too...as will more consistent driving on my part.
The following is a base Lancia Delta with each part installed separately to record the increase in power, torque, and performance points. The last 2 columns show how much hp or torque you get per performance point added.
https://spreadsheets.google.com/spr...5udHJwZzYtYWVPZjlyNGJMZGp1Vm9nenc&output=html
Max Power Build
It's pretty obvious that if your goal is to have max HP you'll want to install the high rpm turbo. It gives you 1.85hp per performance point which is greater than any other part. It also gives you that power in the high rpms where you will likely spend most of your time. The ECU upgrade, something I previously overlooked is also very good. It gives you an extra 200rpm to your redline and has a decent hp/pp ratio. Also good performers are the Exhaust and Intake manifolds, which should be selected before adding an exhaust. A surprise is how poorly the air filters perform. This is typically the first thing I install but apparently they simply aren't worth the performance points.
N/A Build
If turbos aren't your thing, there are several parts which will give you a higher redline and should be utilized on engines that have outstanding high rpm power. Start with the ECU and then go straight for the racing exhaust. The Sport Cat will help stretch the RPMs too but you'll get more hp from intake and exhaust manifolds so there may be some experimenting to do there.
Torque Build
I haven't had much luck with maximizing torque but if you want to run super tall gears and make use of that low end grunt, start with a low or mid rpm turbo. After that, go with the intake and exhaust manifolds and a racing air filter.
On the track
I ran two builds in my Lancia, one with a mid-rpm turbo and a second with the high-rpm turbo. The track was Deep Forest Reverse which has moderate straights including one that is uphill. Both builds were set for 450pp. Believe it or not, I was running inside a 1-2 10th window with both builds. The high-rpm build would gain time on the front straight and slowly lose it over the course of the lap. The mid-rpm build did very well on the uphill portion of the track and would get a good exit speed on the last turn and run almost neck and neck with the high rpm build until a few hundred feet before the start finish. One clear difference between the two was shift points. With the mid-rpm turbo I was shifting very early, around 6,000 rpm. With the high-rpm turbo I was shifting around 6,500. I didn't run to redline with either of the builds so someone driving an automatic would be at a great disadvantage in this car. I may try again to mix up the parts to get a build that is more automatic friendly.
Concusion
I don't want to get into the benefits of torque vs hp, but I think this quick analysis shows that some parts are better than others depending on what your goal is. Picking parts that yield the most hp or tq per pp will give you a slight edge over the competition. I didn't see outrageous differences in lap times but each track is different, and fine tuning the transmission to work with the resulting hp/tq curves will help too...as will more consistent driving on my part.
