(retune with a 2# lower?) Question for the masses...

[Konaboss302]

So... I have a 2.65" upper on my car and it made 15psi at sea level and was tuned by Hermann accordingly... It's getting to the point where I need to service the inner belt, and while doing so I was going to have to pull the pulley cage of course... here's the deal. I now live at 4800 ft altitude and only see 12-13psi up here. If I were to replace the stock cage with a 2lb Metco Kit, I should be alright WITHOUT a retune right? It would only bring boost up by 1-2 psi which would still be within the threshold it was tuned at... Anyway, if I'm going to have to fight that stock lower I figure I might as well just dump the cage and keep a stock sized or 2lb lower ring on it to ease service of that inner belt for the future... Alright guys, what's the opinions?

 

[BBCOBRA]

you might be ok but I'd check it anyway. I had to add a mafia and a bap when I added the 2# lower to mine.

 

[Konaboss302]

I've already got a mafia and BAP on the car, im just in northern Montana and theres no tuners remotely close to me...

 

[unit213]

I should be alright WITHOUT a retune right?

Keep in mind that boost is just a measure of restriction. At a minimum, you need to check your A/F ratio. It's very cheap in comparison to the alternative. The last thing you want it to run 15psi with an A/F that is really lean. You'll have a lot more to worry about than getting a tune.

 

[BBCOBRA]

That is one reason I got a wide band kit for mine. I was using a mail order tune and also I could monitor it any time I want. You can data log with a sct tuner. More money to invest but it really helps. You can pick one up used at a decent price if you look around.