well fellas i have a 97 cobra with a on3 turbo kit it made 380 rwhp and 366tq on 6.42 lbs which im pretty happy about but i was wondering if i add another spring which it would go up to 7 to 8 lbs of boost if i would need to retune the car ? any advise would hlp im looking for the car to go up to 430 or 450 tops thanks for all the help fellas...

 

430_450 is pushing the limits of your block,

And general rule of thumb, whenever you add or take away boost you will need a retune.

 

It's not pushing the limits of the block, it's pushing the limits of the rods. That block is good to over 1000HP and the crank is good to at least 800HP.

400RWP is considered safe and if you add boost, change the tune.

 

More air needs more fuel.. Easiest way to look at it.

 

thats what I was meaning.

And I know 400 is safe i was meaning 430+ is considered pushing it, Im running 400rwhp and mines a safe tune and dont see anything happening anytime soon

 

ok thanks guys so what would u guys recommend to hit the 400 mark or close to it i know 380 is really close but i just want those extraa few ( is that me been selfish or what ) or should i leave it as is ? thanks..

 

also i was wondering if you guys could help me with this ..my wide band gauge sometime it reads that the car is running lean as helland i mean all the way to 20 to 1 i believe thats how to write it but when im running the car hard or just cruising its good but when im in idle or let off the gas it reads bad lean as hell..thanks.

 

Knowing myself i would do it, there's plenty of mustangs daily driven with over 400 on the stock motor, myself being one of them. My question would be do i trust my tuner and what he's doing when getting into those power levels

 

no i dont trust any around where im at but il take care of it once i get back home do u have knowledge about my gague problem

 

under closed throttle conditions it should lean itself out and read like that, my AEM UEGO just goes to dashes ( --- ) when i let off

under idle it should be rich on initial startup then sort itself out, take a vid of a cold start and we can go from there