mrtstang

Yeah, i don't plan on shifting any higher than 5800 on the juice. I see no point really. Even shifting at 5500-5800 you'll still come back into a nice fat hp & tq curve.

tbirdscwd

We'll see what shifting a bit higher does for my times on my next trip to the track.

nickmckinney

Rod I got a question for you. So far it seems people are comparing peak to peak levels, do you know what gain you have at say 5000, 5500, and 6000? I was recently talking with someone who wants to make 450RWHP NA and told him to use 320RWTQ as a constant and start plugging it into the HP and RPM calculator to see what RPM it will need to run at. Most 4.6 NA motors in a serious build will do 320RWTQ give or take, street ones can do it at lower RPM and race ones will do it at crazy RPM.

tbirdscwd

7,380ish rpm......doesn't seem too out of hand. LOL That's using the equation HP= TQ(RPM)/5250

edit: You'd probably need to shift close to 8,000 when running that setup!

mrtstang

All i can tell you is that the stage 2's were practically dead even with the stockers (within 3-5 hp) from around 2500-4500, then the hp and tq started to take off. At 5000 it looks like about a 10 hp gain, at 5500 maybe 15-18 hp, and at 5800-5900 (my tuner stopped it there) i'd say really close to 20 hp. The old peak was 5000-5200, and the new peak is 5500.

I can tell you this though: With the rev limiter bumped to 6600, it pulls very well to 6300-6400. At some point i'd like to get it back on the dyno, and see what the curve looks like at the higher rpm's.