It all depends on who is doing the street tune, 95% of my tune was done on the street and was 95% correct when we got it on the dyno

I street tune about 90% of the cars I tune, I won't run them on the dyno till I've got them dialed in on the street. Most of the time I can play with ignition timing on the dyno and make next to zero gains, I had one car pick up 30whp (turbo b16) from throwing a few more degrees timing at it but honestly should have left it where it was from the street tune because it popped a few months later after the dyno tune. I prefer street tuning except for cars that get a bit too rowdy to dial in. Not a big fan of having to do 4th gear pulls to tune the cars on the street because they won't hook for shit in 3rd.

As a side note, when I tune a car on the street then throw it on the dyno jet I tune on they are always rich, after dyno tuning I always take them back out on the street and make sure the afrs are correct because the dyno doesn't hold the same load as the car will on the street.

25lbs on a stock b20 could be done but it won't last and its probably much richer and has way less timing then what would make power, which is fine for what it is since it's much safer to make power with the boost then with an aggressive tune.

That's why your butt doesn't do the tuning.. wideband and det can work pretty well. Dynos aren't gods gift to tuning like many people think.

I can't even count how many high dollar professional dyno tunes I've seen with absolute bullshit part throttle tuning. I have never understood why someone would pay $500 bucks for a dyno tune to have a car that runs like dog shit everywhere in part throttle. I've seen Fuel collums overlap, same with timing tables, lines look like a bunch of snakes wrestling. I've also seen 22* base ignition timing all the way from idle out to 2200 rpm regardless of load causing a ton of low rpm knock which resulted in some trashed bearings. Dyno tuners sell people on the idea it's the only way to tune cars, but it's not, yes I get the idea that allot of street tuners are just some kid with a laptop who downloaded Crome free and has no idea what the fuck he's doing but I also know plenty of people who have tuned their own shit and had their cars run amazingly well. It's no different then building a motor or putting together a tranny. It takes patience, knowledge and experience to get it to work right. All that being said, I've been tuning cars for a living on taxes since 2010 and get to do this stuff everyday and I really enjoy street tuning cars more, most of the cars I dyno tune is because they want to have some big number to Dick measure with other people on the internet.

I street tuned a 98 civic sedan, 84mm sleeved b16, ram horn, eBay 35r on 24lbs pump gas, full weight that ran 10.9 and trapped 134mph. Car runs hard and gets daily driven to work on nice days.

the closer you get to 400hp the less room for errors. The higher the hp the more likelyhood an error might occur. This is the main reason most people stay 300 or under, if anything goes wrong while under full load when tuned damn near to a breaking point ....... it’s going to be ugly ....