Originally Posted by mrg666 (Post 3079403)

260 whp is the entry level power of a supercharged twin with 91 octane.

2800 lbs is the stock weight

2800/260 = 10.77 lbs/whp for a supercharger with 91 octane

200 whp is the highest NA with 91 octane around. It was CSGMike's car with ACE ~ 195whp. But lets call it 200 for your benefit.

200 whp * 10.77 lbs/whp = 2153 lbs required for the same ratio of a supercharged twin.

Show me a twin at this curb weight suitable for daily driving. There is only one on this forum which is close to 2200 lbs. And it is completely stripped out with just one seat in it and it doesn't count.

It is not possible to bring an NA car to the same power-to-weght ratio of a supercharged car. Yet again, you don't know what you are talking about. :bs:

Originally Posted by nikitopo (Post 3079641)

I'll say again bigger wheels, tires, brakes. Someone can go in the high end cost category and install forged wheels, very light brakes etc. We are talking here about going with the ordinary options.

Originally Posted by nikitopo (Post 3079641)

A 260 whp IS NOT the entry level output of a supercharged twin. Maybe it is the output of some superchargers, but not all of them. Usually they are moving closer to the 240 whp area.

You are also starting with a stock car and you're not adding any weight because of the supercharger and other needed supported mods. I'll say again bigger wheels, tires, brakes. Someone can go in the high end cost category and install forged wheels, very light brakes etc. We are talking here about going with the ordinary options.

So, your numbers should be:

2900/240 = 12.08 lbs/whp

For a 200whp NA car we need:

200 whp * 12.08 lbs/whp = 2416 lbs. It is light, but it is quite possible without even stripping the interior. I am already in the 2620 area and I haven't done too an extreme weight reduction (e.g., changing front seats or exhaust, removing back seats etc).

Besides, you can install certain lightweight rotated parts that give you a much bigger weight gain under acceleration. You are supposed to have a PhD. Go find the rotational inertia equations and figure out for yourself. I will not start here such kind of discussion.

Some might say that I am doing a fair comparison, but I said this at the beginning. Comparing a basic supercharged car with a NA modified car that has additional lightweight parts. If you do the same changes on the supercharged car, then yes you cannot catch it.

Originally Posted by RJasonKlein (Post 3079264)

Congratulations! Something you should know is that the base tune is very conservative and performance will improve substantially, particularly in the top end, with datalogging and flashing of successive tunes. Initially I felt that the car wasn’t as fast as I had hoped, but I soon found that it’s quite deceptive because the power delivery is so linear and strong right off of idle. Driving the car for a few days demonstrated how much more power was now available throughout the rev-range, and improved tunes really made the car come alive later on. Enjoy!

Originally Posted by bfrank1972 (Post 3079295)

I think this header is for people who A) aren't interested in FI for various reasons, or B) are interested in supercharging down the road and want to optimize at no expense spared. Also keep in mind that purchasing/shipping/installing/tuning/running someone's used supercharger kit costs significantly more than $1700 plus an extra 500-600.

Originally Posted by justinco (Post 3079576)

Unfortunately I did not. Looking back, I wish I would have.

Originally Posted by nikitopo (Post 3079613)

Bigger wheels and tires, bigger brakes.

Originally Posted by Azzudien (Post 3079714)

Thanks Jsube, yes I have sent my first datalogs to Zach and anxiously wait for the first revision.

And I agree with new2subaru, this thread is about the A350 header and Delicious tune, lets stay on topic.

And for what it's worth, the next time I have to replace the entire exhaust I am finding a lift. My neck is still killing me from spending 5 hours on my back with my car just up on jack stands. And before someone screams 5 hours? It was my first time doing something like this so I was taking it slow and checking everything as I went.

Originally Posted by JSube (Post 3079848)

I def. got a vivid picture of you under the car with exhaust pieces inches from you nose FOR 5 HOURS :lol:
I'm lucky my neighbor has a lift- it's a 90 min job if you're super anal, 60 min if you're a normal...

Originally Posted by mrg666 (Post 3079892)

What I see from most of the dyno charts is that ACE header fills (flattens) the dips in torque and power curves very well. I am wondering if the ACE header will make that much difference for a supercharger setup since the power and torque curves are already very much flat. I can't find a dyno chart that shows a supercharged FA20 before and after ACE header. Do you guys have any insights? CSG Mike, do you have any comments?

Originally Posted by CSG Mike (Post 3079919)

It's additive with a supercharger, and allows for more boost before knocking, all other conditions equal.

E.g. a JRSC HBP can be used on pump gas with an Ace header. On a Tomei/JDL header, the HBP will cause the engine to knock severely enough that you have to pull a ton of timing at higher RPM to be able to safely redline, effectively completely negating the point of increasing boost to begin with, and ultimately having less peak power than before the HBP.

Originally Posted by mrg666 (Post 3079955)

Interesting! I am not going to increase boost. If I just replace the stock header with ACE and switch to Delicious tune, I understand from your first comment that the power will increase. I assume ACE header will tilt the curves upwards to provide most of the benefit at higher RPM, right? How much is a reasonable expectation over stock JRSC with factory tune? Do you have any estimate/experience? Thanks for helping out.