Best bolt on mods?

[MAKG]

Yup, it absolutely does.

But there is an additional problem. People don't specify what they are actually trying to accomplish, and you get weird comments like "I need more power for towing." We see quite a lot of people making high RPM mods that mess with low RPM, for applications that never redline the engine, and sometimes never use full throttle!

As an engineering student, I'm sure you know what happens when one skips the requirements document and goes straight to fabrication.

 

[gw33gp]

Did you measure your reaction time? What were the actual times?

Sorry to bring this thread back so late but I found this question unanswered. I was out of town for awhile and missed it.

Bob, I took reaction times out of the equation as much as I could. That one of the reasons why I chose the 40 to 70 and 50 to 80 mph tests. I began accelerating below the starting speed and started the stop watch the instant the speedometer hit the starting speed, then stopped it the instant it hit the ending speed.

Actual times were:

40 to 70 mph test.

Stock; 9.7 sec.

87 Octane performance program; 9.0 sec.

50 to 80 mph test.

Stock; 9.9 sec.

87 Octane performance program; 9.45 sec.


All tests were done with my ~350 lb shell on the back. I also tried to have the gas tank near the same level. I also did the tests at the same location to eliminate elevation change effects.

 

[Kona]

You are exactly right!!! With today's CAFE standards, all vehicle manufacturers design and build their vehicles to be as efficient as possible!!

I hate it when these after-market manufacturers (like K&N, etc.) lie about the performance gains of their air filters, intakes, ignition systems, etc. .......Even worse, people throw millions of $$$ away thinking they work!!!

LOL , funny stuff. The easiest example I have at hand ( easy to look up ) is the last couple of years GM produced the Firebird and Camaro. The 2 cars got the same (exact) engine the base Corvette did but made 15 hp less! The reason was the hood line on the Camaro's required a different routing for the air intake. Anyone that staightened out there airway got 15 dyno prove-able hp back. This was less then 10 years ago.

 

[Bob Ayers]

LOL , funny stuff. The easiest example I have at hand ( easy to look up ) is the last couple of years GM produced the Firebird and Camaro. The 2 cars got the same (exact) engine the base Corvette did but made 15 hp less! The reason was the hood line on the Camaro's required a different routing for the air intake. Anyone that staightened out there airway got 15 dyno prove-able hp back. This was less then 10 years ago.

Total BS!!!! The cams were different, as well as the heads & valve sizes!!!! The LT-1 Corvette had 2.000" intake valves, the LT-1 used in the
Camaro & Firebird were 1.937"

 

[Totalled]

Yeah, so, my 4.0 liked a cat back exhaust.