joker_01z28

iTrader: (14)

i treid the search but was coming up with gas and 1/4 mile times. my question is how much of a hp and tq differance is there from a 10 bolt with 323s to a 12 bolt with 373s?

Juiced

iTrader: (2)

engine tq remains the same.... applied tq will increase by 15%

RAGENZ28

iTrader: (5)

If you're talking about power loss a 12 bolt with 3.73 will run faster than a 10 bolt with 3.23's

Don't worry about power loss, the 10 bolt is a POS and the faster you get rid of it the better.

Mikes96z

iTrader: (39)

I'd like to know too how much taller gears affect dyno numbers. I've heard contrasting info but all lead to some power loss.

Mikes96z

iTrader: (39)

any other inputs on this?

Grimes

iTrader: (3)

most ppl say that you loose 12-13% through an m6 and ten bolt. A 12 bolt will probably loose a couple more percent. But this is just a really rough guess. I mean, there are so many diff factors. It's "worth" it though for the added durability of the 12 bolt.

joker_01z28

iTrader: (14)

the reason I was asking is i had my car dynoed with a k and n fipk headers, ory and catcback with my 10 bolt and 323s and made 350hp ona mustang dyno, few months later the 10bolt broke, bought a 12 bolt with 373s and everything else in my sig and made 365hp also a mustang dyno, but different location.

ScreaminRedZ

iTrader: (3)

350 on a mustang dyno with basic bolt-ons?

joker_01z28

iTrader: (14)

350 with full exhaust, k&n fipk, diablo tune 10bolt with 3.23s. I dug threw my records and beginning to think there machine is or was funked up

ScreaminRedZ

iTrader: (3)

Sounds like it. Those numbers would be decently strong on a dynojet. On a Mustang dyno they're huge!

Tony Mamo @ AFR

iTrader: (13)

A 12 bolt with lower gears (higher numerically) would likely cost you in the vicinity of 10 HP....more if the ratio change was more dramatic. The 9" would have been in the 12-15 range (with the same gear change) due to its less efficient pinion location and heavier internal parts.

Bottom line is all dyno's read a little different....especially Mustangs IMO because alot of them are messed with to get them closer to DJ numbers so their customers dont leave deflated after spending their money on the dyno time. Any future testing should be done at the same location if you really want to learn whether your future mods were worth anything and quantify how much.

Tony

fccs

iTrader: (26)

If your an m6 don't you mean you had 3.42s...?

joker_01z28

iTrader: (14)

Im an a4, after reading the dyno results closely im thinkin it was "messed with" things just well just say add up, I only go to one shop now where i did the 365hp at

junior28570

iTrader: (22)

it sounds like they were messed with .. you sould have seen a loss of dyno numbers w/ 3:73's and the 12 bolt (10+rwhp I'd guess). However, your track #'s will be better

mrr23

iTrader: (3)

this was in my car. only change was the gears.

stock 3.23 to 4.10 loss 12.9 rwhp 24.2 rwtq



4.10 to 3.73 gain 7.2 rwhp 22 rwtq

Mikes96z

iTrader: (39)

That's what I was looking for!!!!

382ssz28

iTrader: (24)

One more thing to think of is tire size. When I went from 3.23 and the stock 275x17 to the 3.73 and 28" tire, (10 bolt), I noticed on the calibration the speedo was only 2 MPH off, not much. Your only loss would be the bigger diff itself, whatever choice is made. Just an opinion.

john563

iTrader: (17)

when you whent from 4.10 to 3:73 were the 4:10 micronite as well?
If the 4:10 were micronite from vinci the process did not lower the "dyno loss" as much as I thought it would..On their site it claims you will gain power if you have this done..I figure by going from 3:23 to 4:10 you'd loose around 15 rwhp,so if the 4:10 were processed I thought it would be lowered..
Not trying to knock or anything just curios..
I'm thinking of getting some in the future and your the only one that I know who has them..I think Predator has them too though

To th O.P. Sorry for the hijack,but the thought the question applies to your thread.

pdd

iTrader: (3)

holy ****. torque took a huge hit from the gears. dam, i wonder what i would of pulled with the stock 3.42's and stock sized tires

mrr23

iTrader: (3)

4.10 were not processed.

here's a dyno compare of 3.73 unprocessed versus processed in my car