I have seen and spoken to several tuners and vendors and the variance in rwhp is interesting.
Some say 23-28 rwhp (vendors) and 32-52 torque others say (reputable tuners)11-15 rwhp and same amount in torque this is with out a cold air kit just a tune. What gives? We all read the same stuff but I just want to make sure I spend my money on something that works. Am I just being to critical? I understand different dynos etc but sheesh.

 

My guess is different dynos, different octanes, different gear ratio's(3.31, 3.55, 3.73), different environments, and some being tested in different gears(4th or 5th)

Lots of variables!!!

 

I get that but dang to that degree in variance? Im new to this and for some reason it just seems some of the numbers are to good to be true? Anyway thats just my .02. Thanks for the response

 

I always assume I'll get half of the advertised hp with any product, that way anything over half and i'm winning.

My goal is CAI, longtube headers, catback exhaust and tune = 400-420rwhp with auto GT/CS.

 

That makes sense to me and about the same thing I will be doing

 

That's always a safe bet!

I love it when people take the advertised claims and add them up for their total horsepower.
Although I think I was guilty of that when I was 18y/o with my first stang.

 

I don't get the point of slamming so-called "ricer" math, no one knows their true hp until it hits the dyno and even then there's still a million more variables that can throw the number in opposite directions. But, atleast with my v6, dyno baseline 185rwhp, blower 265rwhp, after adjusting air/fuel ratio final dyno 276rwhp and ofcourse my numbers we're still short of prochargers claim but its not crazy to add parts expecting a gain.

 

You're right. It's not crazy to add parts and expect a gain but it is crazy to add parts and add advertised claims to equal the total hp/trq.

 

You can take RWHP numbers with a grain of salt. Like others have said there are so many variables. The best thing to do is read up on different tuners. Some shops actually do their own tunes while others are more parts suppliers that outsource their tuning. When you find one you like monitor your gains on the same dyno if possible. That will give you the best idea of that they are doing. At the end of the day all that matters is how the car drives and and does at the track.

 

Just ask for proof. Ask for a dyno sheet and read it with a fine tooth comb.
That's not too much to ask. Then ask if you get no where near what they claim can you get your money back.
It's also good to hear it from a 3rd party. Someone who purchased it first. If they did tunes, they have customers right?
Also ask if those claims are on "race" tunes with race gas and what you are going to get on your fuel.

Gains should be repeatable by the customer. If you do want to test a tune you will need to have the stock tune in the car and drive to the dyno, make at least 2 runs, then add the tune and make 2 more. Be sure to keep coolant temps very close to be fiar.
The gain is the gain.

Jay

 

Based on the gain seen going from 87 to 91 on the 2010 with factory tune and then an aftermarket tune on 93 vs the gain seen going from 87 to 91 on the factory tune on a 2011 I would expect to go from 416 bhp stock on 91 to 432 bhp tuned on 93.

I would expect about 14 rwhp,

You can easily swing power numbers 5% or more just by changing oil, water and intake manifold temps.