Gene

n54tech is basically jb3 country.....e90posts is a mix between all tuner companies....

also, Dinan price does come with a warranty, unlike the other alternatives...

yes, it is suggested to remove the jb3 from your ecu prior to service

acuteperformance

http://shoprpi.com/product_info.php?...f7912961ddc2f0

Michael
Acute Performance

tuffluck

Not to be a jerk, but it sounds like corey is just guessing at his power. You would really need dyno numbers to see actual gains.

shad951

+1.........n54tech pretty much all JB3. E90post is a wealth of info for all the tunes. Procede and JB3 are the 2 available piggybacks. The GIAC, Dinan, ESS are the more well known flash tunes. The GIAC seems to be very popular as far as the flash tunes. It is not detectable at the dealer though you face a chance of it being overwritten by BMW if your car goes in for any software updates, HPFP issues. Most GIAC dealers will reflash it for you free first time and up to 1 hrs labor after that. Lots of brand loyality between the Procede and JB3 in the E90post forum so you have to kinda sift between whats fact and whats just tuner war there. Lots of very strong opinions there. That being said I am also considering either the GIAC if I go flash or the Procede or JB3 if I go piggyback. Obviously if you go with the Procede or JB3 you will want to remove it for sure before taking your car in for any warranty work. Both units come with code clearing technology. The Dinan does have the advantage of the Dinan warranty but IMHO it is way overpriced compared to the other tunes.

Persian_535i

I'd go with a JB3 tune for a nice horsepower increase. The JB4 tune is coming out soon which will also add the option to delete any type of error codes that may show before taking your car into service. This is a scanner that comes included and is great to avoid any type of warranty issues, all you would need to do after deleting error codes is just un-install the piggyback. There is also an upgrade Terry the maker of JB3 is selling once the JB4 is released to add on to your existing JB3 if you do not wish to purchase a JB4 that will delete error codes as well, from what he says that scanner for the JB3 will retail around $75-85.

corey

These are manufacturer claims, not guesses. Dinan's stage 2 software is advertised as bumping up the stock from 300 HP to 384 HP and 421 lb/ft of torque. The Dinan exhaust adds 6 HP and 5 lb/ft of torque. This is at 91 octane. I use 93. The RPI scoop is advertised as a 5-7 HP gain. I have not dyno'd my car and probably never will. You're not being a jerk, I would ask all the same questions if I was shopping for this right now as well.

mookish

I would love to see solid proof that a scoop adds any additional HP at all. 5-7 HP is wishful thinking IMO from a simple scoop that can really be made out of anything. Quoting manufactures numbers is a far cry from real world dyne results.

NYGOLF

Corey
Do you have a pic of your scoop installed?

healthservices

Either way it is just a gauge as to the amount of power you could expect. Dynos do the same, one dyno to the next will give you different results. As for power received from a scoop it is hard to replicate the amount of ram air you would get on a dyno. I'm sure the 5-7 is at peak not across the board, just like the tunes.

tuffluck

i think one of the biggest things with a dyno also is just seeing how much your car produces stock. it is different across the board and the manufacturer's ratings can often be off significantly. my rated 300-hp Z28 produced 360-hp stock when i dyno'd it on 3 straight runs. that plus the expectation of power increases from mods might shock you a little as far as the final power your car actually puts down.

you should totally dyno! it is cheap and good useful info, especially for someone that has modded their car with a chip and have others asking the results.