rob.d

I usually see about 7-8 hp loss when going from 3.42's to 4.10's.(ls1) Is the loss real well thats a different story. When cars add gears cars usually get better et's. So how does better et and lower dyno numbers add up. I have been told three or four reasons why you lose hp on the dyno. Below made the most since when I asked about the hp loss on dyno's.

"The increased parasitic loss from the metal-to-metal contact with more teeth on the ring gear."

Is the answer right or wrong.IDK But the loss will show on the dyno. If you have ever done a same day dyno and gear swap post up.

I have also been told about a timing issues with the dyno's and the gears. Im not to sure about that explantion either. Either way the loss shows on the dyno. We get still get better track times and the car pulls harder on the street/track. We race on the track/street not on dyno's. Just putting that out their.

Houghtown

That's where I got the gears installed. Travis really cool and I won't go anywhere else.

There was another guy there with an 04 mach that had L/T's, O/R X, magnaflow catback, intake spacer, TB, JLT intake and he dynoed at 294 hp & 307 ft/lbs. Travis told us to come back and have a custom tune done and we'll see better numbers.

Can someone explain gear whine to me?? When the car is in 5th gear from about 55-70 mph i hear what sounds like a loose bearing or metal to metal noise. I don't hear it in any other gears. Is this gear whine? Should I take it back to gearheads?

03MachMe

if the gear was not installed PERFECT you will hear some whine. as long as its not super loud your fine its not going to hurt anything. the higher the gear the louder the whine. i would expect better numbers with LTs tho did you say it didnt have a dyno tune? if not that is prolly about right after a dyno tune with travis he should be seeing about 315 or so

Houghtown

He did not have a tune on his. Travis told him to come back and he would be over 300 w/ a custom tune. I want to do the same after I get my spacer in. I would like to hit 300 with a good tune and my mods.

Yes the whine is in the higher gears. I hear it a little in 4th and a lot in 5th between 55-65 mph. Will that whine eventually go away or is that there until i change gears or get rid of the car?

03MachMe

yea he will be at about 315 or so i would say and you would prolly be just under 300. im not sure if the whine goes away or not i dont have any so i wouldnt be able to tell yea. i know it would go away if you got louder exhaust lol