average hp gain
 

im getting a z when i get back to the states. have it picked out already black coupe 6m with sports package. but im trying to figure out how much money i want to set aside for an intake and exhaust. what are some figures you guys got out of a intake, exhuast and tune?

Across dynos and vehicles, here is what I have found to be the approximate range of % gains over baseline:

Typical intake +2.5 to +3.5% gain (best bang for the buck = K&N panel + smooth intake tubes)

Typical CBE = +1.5 to +3.5% gain (best bang for the buck, used Nismo CBE)

Typical TP/HFC = +4% to +5% gain (slightly more if LTH header instead) (Best bang for the buck - ebay TP's)

Tune = +3% to +5% gain (best bang for the buck - Osirus uprev)

Exact % gain will vary somewhat from vehicle to vehicle and throughout the rev range.

Gains are approximately cumulative; the first breather mod will usually show greater % gains than when the same mod is added later (i.e., 2nd or 3rd bolt on), probably due to diminishing returns as optimal VE is achieved.

Note: Don't get hung up on these seemingly small % increases; remember, on a 275 whp motor, a gain of 5% = nearly 14 whp; a cumulative gain of 10% is over 27 whp (more if you keep adding onto the last value obtained).

On a dynojet, you will see fully bolt-on'd tuned Z's putting down over 300 whp with SAE correction; the highest typically have LTH and lightweight pulleys (not sure if I would recommend those or not, tho'...).

Is the diminishing returns against the original baseline or against the previous modded performance and/or are the gains approximately constant in absolute terms?

Let's say that the first mod will tend to hover around the high % gain estimate and all subsequent mods will hover around the lower % gain estimate.

Gains are cumulative, over and above the previous increase, but the differences are fairly small, so you could use either estimate and get within the ball park give or take 1 -2%

Basically, no matter what you do, you're not gonna see too many Z's breaking 300 - 310 whp on a dynojet SAE corrected with everything bolted on and a tune, at least until VVEL tuning is an option.

bolt ons are the way i plan to go. main reason is that its not a rediculous amount of money to put out. ill save the big stuff for a future deployment

Might as well go TP or HFC. Expect 30 to 40 WHP gain after tune. JMO.

http://www.the370z.com/nissan-370z-p...70z-video.html

42 whp gain with intake, hfc, cat-back, and uprev tune.

Agree with Jordo on all the bang for your buck comments. Don't waste the time and money on the stillen intake. you'll gain around 40 whp with bolt-ons and a tune (give or take a little).

^^^ Raw numbers aren't really telling tho', because they vary from dynomemeter to dynamomemter. That one used in the Import Tuner feature skews a good bit higher than most dynojets I've seen with SAE correction.

Anyway, starting at 284 and ending around 326 means it gained about 14-15% total from baseline. I consider that on the higher side of potnetial gains, but not so far out in left field that it disagrees with the range I've seen for multiple vehicles on dynojets. And again, there will always be some variance.

The biggest gains came from the exhaust + test pipes (the latter being the best bang for the buck mod available IMO), and also note it was the first breather mod added (1st mod tends to have slightly inflated impact it seems). Lower gains from intakes and tune that are right in line with predictions.

Basically, bolt everything on, get a tune, and I would say expect between a 10% and 15% gain over whatever your baseline is on whatever dyno you like to use. A little more possibly with LTH over TP's, and a little more with lightweight pulleys (use at own risk). Just remember to dyno in the same gear each time ;)

thanks for the advice guys