Anyone with 3.90's?
03-21-2007, 08:55 AM
#21
2nd Gear Member
Join Date: Feb 2006
Location:
Posts: 432
RE: Anyone with 3.90's?
ORIGINAL: 97targa
Just because someone has 18" wheels doesn't mean the geomtry of the gears change! My 275/35/18's are the same size as your 275/40/17's. all within 5 or 6 rotations over a 1mile period. Depends on the tire manufacturer
ORIGINAL: xxkazp3rxx
I had 3.90's... I also have a stepbrother with 4.10's, and had a good friend with 3.73's... all with alike mods (not exactly the same but same basic bolt ons)
The 3.90vs the 3.73 in my experiance was... I had him out of the hole pretty decently... and kept accelerating on him, he had more top end in middle to high 4th gear.. I didn't race in 5th when I had my car...
the 3.90 vs the 4.10... I got taken out of the hole (barely - he also has 18" wheels vs my 275/40-17) - we basically matched gear for gear the whole way until I started pulling on him when we both hit 4th gear...
So.. in my experiance... 3.73 = more top end... 4.10 = more low end (obviously), I found 3.90 was a good low end gear, and pulled well in top end... I felt it was a good comprimise... I would also say - it depends on where you're goin with your car.. if your just going to do this, and that's it - i may even say to do 4.30's [8D]- u just need some good tires with it... but also remember you will need a speedo recal, or a tuner... because your speedo will be off - causing your milage to be off...
I had 3.90's... I also have a stepbrother with 4.10's, and had a good friend with 3.73's... all with alike mods (not exactly the same but same basic bolt ons)
The 3.90vs the 3.73 in my experiance was... I had him out of the hole pretty decently... and kept accelerating on him, he had more top end in middle to high 4th gear.. I didn't race in 5th when I had my car...
the 3.90 vs the 4.10... I got taken out of the hole (barely - he also has 18" wheels vs my 275/40-17) - we basically matched gear for gear the whole way until I started pulling on him when we both hit 4th gear...
So.. in my experiance... 3.73 = more top end... 4.10 = more low end (obviously), I found 3.90 was a good low end gear, and pulled well in top end... I felt it was a good comprimise... I would also say - it depends on where you're goin with your car.. if your just going to do this, and that's it - i may even say to do 4.30's [8D]- u just need some good tires with it... but also remember you will need a speedo recal, or a tuner... because your speedo will be off - causing your milage to be off...
03-21-2007, 03:47 PM
#23
2nd Gear Member
Join Date: Dec 2004
Location: New Hampshire
Posts: 219
RE: Anyone with 3.90's?
Yeah, I got 'em. They're fine. You will need the kit.
If you want the 3.90s just get them. They're slightly cheaper than the 4.10s and will give you marginally better gas mileage and slightly more top end, but obviously won't have quite as much acceration as 4.10s. But that's the point, really.
The whole FRPP is better than Motive debate is dubious at best, though. Various people have even claimed that the gear sets are both made in the same factory. I don't know whether that's true or not, but my Motives have been in for 2 years and >10,000 miles, with no problems and no gear whine. (Gear whine is more related to a bad installer rather than gear manufacturer.)
If you want the 3.90s just get them. They're slightly cheaper than the 4.10s and will give you marginally better gas mileage and slightly more top end, but obviously won't have quite as much acceration as 4.10s. But that's the point, really.
The whole FRPP is better than Motive debate is dubious at best, though. Various people have even claimed that the gear sets are both made in the same factory. I don't know whether that's true or not, but my Motives have been in for 2 years and >10,000 miles, with no problems and no gear whine. (Gear whine is more related to a bad installer rather than gear manufacturer.)
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