It cant hurt and only cost a bit more than factory replacements. As for the compression, its up to if you want faster spool and more power throughout the rpm, or run a couple more psi safely on pump. I went with 9.25:1 from 9.5:1 so i can still get good spool.

 

what kind of a difference are you expecting from a 0.25 decrease.

 

very very little. The only reason i changed is because thats what Arnold had instock when i got my custom wisco for a 92.8 crank and in 83mm. Some people go from 9.5:1 down to 8.5:1 and even 8:1. I would take 9.25:1 anyday since the tunes out now are good enough not to worry about blowing stuff up. Back about a year + ago, that maybe a differnt story

 

are you refferring to arnold's tune, i think he told me that he has SW for the setup.

 

Im talking about all chips in general now. Arnold uses Eurodyne tunes.

 

how does that compare to others.

i think you mentioned Revo 440CC and unitronic or w/e ...

I think GIAC too ?

 

Should be right up there with the Unitronics 630cc file otherwise Arnold wouldnt sell it. As you can tell, he doesnt sell parts he doesnt believe fully in. Revo for transverse cars arent nearly as nice as the longitude cars and giac lacks power in there tunes, just check out the very small few with Del Rio power kits [:'(](made in Mexico).

 

these tunes are not specific to the turbo just general BT maps that need to be adjusted right?

 

Depends on the tuner. Most make a specific turbo file and you can run a turbo up or down from them with ease. Most tuners have something for gt28r, gt28rs, gt2871r, gt30r, 50trim. since they are the most common. You just tell them what you have and they will get you the correct file.

 

so the differences are minute enoguh to make adjustments

i notice that chips have "suggested" mod lists, can they incorporate other mods done to the car, ex. exhaust, TB, C/R, etc.