4.10 VS 4.30 - 3.73s too slow

Witzy0070 · Apr 9, 2015

I currently have 1996 Cobra 4V with a 75 shot of nitrous and a Vortech pushing 12 pounds. After driving for a few months I have grown weary of the amount of time it takes my 3.73s to get me into my power band. I have been reading all over Google and haven't come up with a conclusion... I rarely drive on the freeway so revving isn't of much concern. I don't give a damn about gas, I have a high power V8. I am worried 4.10s might not be as big as a difference from 3.73s as I'd like. My car feels like a dog off the line for the power it makes. If a centri builds boost with RPM...

I really don't know.

Witzy0070 · Apr 9, 2015

I feel I should also add I have Torsen racing 8.8 diff and Moser 31s.

Sinned83 · Apr 9, 2015

3.73's to 4.10 isn't to noticeable. Our 4v's love the gear go big.

Witzy0070 · Apr 9, 2015

I am trying not to fear the gear. After being in my buddies 500WHP STI and watching how quickly that ate gear shifts I might be inclined to go with the 4.30s.

Sinned83 · Apr 9, 2015

I've heard of guys doing 4.56's which seems like a lot for a SC'd car tho

Witzy0070 · Apr 9, 2015

That's too steep for me, I am thinking for 4.30s.

96blak54 · Apr 9, 2015

For an engine driving a centrifugal it only makes sense to up the gear just so the engine doesnt struggle to get to its power band. 4.30!

Witzy0070 · Apr 10, 2015

Another vote for 4.30s with some info!

kb1982 · Apr 10, 2015

You get too much gear in it, and as soon as the boost comes on it may make the tires go up in smoke. My 95 is lazy until the boost comes on due to its low compression ratio, but with 4.10s, it will scratch the tires about 15 feet after shifting to 4th gear. You may fix one problem with the deeper gears, just to have another one, traction.

Witzy0070 · Apr 10, 2015

I was thinking the same thing, I hear you. I was thinking of throwing on a set of Mickey Thompson ET street radials on. My current tires are meh.

castine917 · Apr 11, 2015

You have 3 high rpm factors. Nitrous, centrifugal blower, 4 valve. Go 4.30

Witzy0070 · Apr 12, 2015

After doing homework and talking to my tuner I am going with 4.30 gears. Thanks guys.

SnakeMedic · Jul 20, 2015

What size wheels/tires are you running? My Vortech only hits 8lbs of boost and with the stock gears (I think) I still spin like crazy on 315s. Really interested in this since I plan on going big with the gears as well. My initial thought was 4.10s. You might change my mind!!

Witzy0070 · Jul 20, 2015

I am running 18" wheels with 4.30 gears for a few weeks now. Additionally I am running a 2.87 pulley, so somewhere near 14 psi. When the nitrous hits it's over.

SnakeMedic · Jul 21, 2015

Witzy0070 said:
I am running 18" wheels with 4.30 gears for a few weeks now. Additionally I am running a 2.87 pulley, so somewhere near 14 psi. When the nitrous hits it's over.

Oh wow. That is insane. What Vortech do you have? What series tires? I have 315s.

Witzy0070 · Jul 21, 2015

SnakeMedic said:
Oh wow. That is insane. What Vortech do you have? What series tires? I have 315s.

I am running a Vortech V-1 S trim blower on a 2.87 pulley and I have Nitto NT555 tires in a 285/35/18.

SnakeMedic · Jul 21, 2015

Witzy0070 said:
I am running a Vortech V-1 S trim blower on a 2.87 pulley and I have Nitto NT555 tires in a 285/35/18.

Dayum. Same supercharger as me, but I have the standard pulley.

So, how does it drive now? Without nitrous how does it hook? With my setup I get some pretty good wheelspin in 1st and 2nd in the upper RPM range, from about 3500 up. Doesn't seem to slow it down too much, though.

Witzy0070 · Jul 21, 2015

SnakeMedic said:
Dayum. Same supercharger as me, but I have the standard pulley.

So, how does it drive now? Without nitrous how does it hook? With my setup I get some pretty good wheelspin in 1st and 2nd in the upper RPM range, from about 3500 up. Doesn't seem to slow it down too much, though.

Depends how hard you floor it. First gear is pretty worthless, low RPM wise in second is a bit sideways, otherwise I feel planted. However, I am lowered on Koni coil overs, Torsen racing LSD, a beast of a torque arm, welded sub frame connectors, and some other goodies, so I don't think I am really an ideal candidate to base tire control off of. Additionally, I feel very confident with my car. In the top of third at full tilt a shot of nitrous will still break the tires loose. It's really that sudden burst of torque that gets it going.

So to answer you question, I don't spin to the point of feeling like I need changes mechanically, more changes on my foot work. I enjoy the set up so far.