CALL911

iTrader: (17)

I don't have flash player on my phone so I can't reference the video to see if I included the actual dyno graph or not. It hits peak power about 6,000 RPM.

This will change with the new custom cam, so it's just a reference for those that wish to discuss this further. FWIW, I have already decided 4.10's will be the best gears to go with for the car.

HCI2000SS

iTrader: (2)

I think you are making the right choice OP. What specs on the cam will you be going with?

CALL911

iTrader: (17)

I have not got that far yet. I know who I will have spec the cam for me (a local friend who works for a speed shop). Something that is a little more driver friendly but cut on a lower LSA than my MS3 cam.

redbird555

iTrader: (14)

sorry ddnt see the no spray thing... people were talking about it so i gave it as a reason. 4.10's to me additionally are really short down in 1st i prefer the feel of my 3.90s because i feel like i can actually use it.

also why would your car not go 120+ if the hp is right and by looking at the mods it should be you should easiily go 120

CALL911

iTrader: (17)

I guess that's my point. "Other people" where talking about it. Not me. It doesn't really matter, just didn't want people changing everything based upon a major power mod the car does not and will not have.

The car did do 118 MPH. This is an accurate display of around 440 RWHP with the stock 3.42's in my opinion. I honestly don't expect to gain much if any power. My guess was 450 RWHP, but honestly after the HP loss with stepping up to 4.10's it may be the same.

CAMSTER

iTrader: (10)

Is 4.10 here.

While it is true you'll loose horse power on the dino due to reduce resistance using a higher numerical diff gear you will find it at the track and on the street with matching traction.

HCI2000SS

iTrader: (2)

Also, with a 4.10 gear on a M6 at stock tire height you can pull around 127 mph out of 4th at 6800 rpm. And that's a good safe rpm limit for the average HCI LS1.

high impact

iTrader: (5)

Did you make a decision yet on what gear ratio to go with? Sorry your thread was derailed into a conversation about spray. 4.10 seems to be the consensus. I didn't have mine dyno'd when I switched from 3.73 to 4.10 so I can't even begin to guess what the hp drop will be but I sure enjoyed the improvement of the lower ratio.

dr_whigham

iTrader: (49)

If I were to do it in the Camaro I had it would have been 3.90's. It would have still been nice on a long 75mph drive, and good acceleration in town.

VandykeT/A

I run 430s with a 27" tire. Car made 452rwhp before swapping exhaust and going to a 4" intake tract. Car trapped 126 at 1800 feet. Stock bottom end I turned 7100. It also made 445 on a dyno dynamics which the tuner said was 10 percent low compared to a jet but idk. It went 10.92 and cut 1.51 60s leaving at 6500. I prefer a steep gear and a big tire. More sidewall will hold the car better and the gear will help 60 and keep it from bogging.

1970camaroRS

iTrader: (8)

My car with a 27.7" tire and 4.30s is really happy. I run it up to 7000rpm which is 135mph with no slip. And keeps it under 2500rpm at 60mph. I'm running a 4L80e though.

But, to do it right, find your max HP rpm and your 1/4 mile trap speed and shoot for crossing the stripe just a tad beyond max hp rpm.
MPH = rpm x tire diamter (in) / gear x final gear ratio (diff) x 336
120 = (6500 x 27) / (1 x gear x 336)
Gear = 4.353

Outthahole

I run 4.10's and cruise at 75mph at 2050rpms on a 26"tire. 80mph is 2200rpms. It sucked before on the stock gears especially with my big cam. 80mph was @1750 rpms.. I shifted out of 2nd gear at 83mph at 7200 rpms. I could get arrested before the fun got started! lol I love my 4.10's,It gave me more usable bottom end power that the big cam took away.

redbird555

iTrader: (14)

I love my 3.90s I have 450wheel right now and it still can't hold it even with new tires. 4.10s first gear is very short and useless to me in town. 3.90s still give good use to1st and give you all the performance gains

Outthahole

I almost went with with 3.9's myself but my builder suggested I try the 4.10's on my stock 10bolt so when i broke it and went with a 9" rear I could change it up if needed. But as far as 3.9's-4.10's your looking at about
190rpm difference so I don't see a big diff for usable rpm in 1st gear. I shift at 7200rpms and dont see shifting 190rpms quicker that noticeable. If I wanted to hold 1st gear longer I'd go with 3.73's. That'd be you holding 1st gear 132rpms longer for you and me 287rpms longer. That would hurt me in the 1/4 mile keeping out of my cams usable powerband a lil longer than I need to be,but everyone likes things for diff reasons.

joeformula

iTrader: (11)

I went with 4.10s through my m6 and love it