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-   -   how gear ratios affect dyno results (http://www.corvetteflorida.com/forums/showthread.php?t=105493)

mrr23 01-15-2016 10:42 PM

how gear ratios affect dyno results
 
this was on my 2000 pontiac formula automatic when i did gear testing for mikronite through vinci high performance. basically the easier it is to turn, the less energy is exerted and lower dyno numbers are a result. of course your acceleration is quicker, resulting in lower et.

this graph shows my stock 3.42 gear vs 4.10 gear.

http://tredalign.com/formula00/famil...nprocessed.jpg

this graph shows 4.10 gear vs 3.73 gear

http://tredalign.com/formula00/famil...rprocessed.jpg

PRowlett 12-29-2016 04:21 AM

I changed gears on my Jeep Cherokee XJ when installed 33 tires, and never actually thought about something like this for corvette, but your DYNO looks very impressive. I must say that speedy acceleration is much more entertaining for me than a high speed run, so I can easily sacrifice lower gains at high RPM.
I was thinking about getting an air intake first, I assume it will give me about +5-10HP.

mrr23 12-29-2016 06:07 AM

Quote:

Originally Posted by PRowlett (Post 196320)
I changed gears on my Jeep Cherokee XJ when installed 33 tires, and never actually thought about something like this for corvette, but your DYNO looks very impressive. I must say that speedy acceleration is much more entertaining for me than a high speed run, so I can easily sacrifice lower gains at high RPM.
I was thinking about getting an air intake first, I assume it will give me about +5-10HP.


you would be correct on the air intake.

Rich Z 12-29-2016 04:43 PM

Just remember that when you do a gear change, when driving a stick shift, redline will be reached a LOT quicker than before.

PRowlett 01-05-2017 06:33 AM

I was checking on the air intakes, and to my surprise I found one that says that it can get up to 24 hp. TQ Gain: up to 29 lbs./ft. on a stock engine: https://www.carid.com/2004-chevy-cor...287635845.html Of course there is no DYNO diagram to prove it, unless not on the website. Do you think it's even possible?

mrr23 01-05-2017 08:13 AM

anything is possible. would you get that on a completely stock unmodified car? most likely not. maybe their test car had headers and a catback system already on it. that would increase the numbers for the air intake.

Rich Z 01-05-2017 01:33 PM

Heck, anything is possible, I guess. Each engine is different, and some respond to even minor mods better than others. Some aftermarket intakes might flow more air, but not filter the air as well as others, whereas others will try harder to keep contaminants out of the incoming air and therefore be more restrictive on the actual airflow. There are always tradeoffs in designs.

Just try to make decisions that are rational for a street driven car if you are driving it on the street.

85vette 01-05-2017 11:30 PM

Yeah, the Edge programmer I have on my diesel truck says that it will gain 100 hp and 200 ft/lbs of torque without any further mods on the highest setting. I have a 4 inch exhaust system on it so it should be doing better than it claims. I only run it on the 80 hp, 100 ft/lbs setting and it's pretty impressive. :hair_on_fire:


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