FI+ shorter final drive

[M23]

Originally Posted by HUNTERANGEL121

I believe this is my first thread...

Anyway, had the idea for a while now,what if you were to install say a 4.44FD along with some form of forced induction making around 280whp?

Overkill, wheelspin? What do you all think

I was actually thinking the same thing and recently asked this in a JRSC thread. Also, while trying to find new JRSC videos, I stumbled upon this video with an FRS in it with a SC + E85 + full exh + 4.56 gears. (idk what exactly the wrx has in it nor how much power it makes tho...anyone know??):
[ame="https://www.youtube.com/watch?v=qFGO62OtjxE"]Stage 2 06 Wrx vs SC FRS - YouTube[/ame]

Imo, I think a lot of 86 owners are soo used to first driving a low-powered car, that once they get a new FI kit installed, they become excited, maybe overwhelmed and content. But, when you think about it, even after a 280whp FI kit install, it is really not super fast at all still and is basically now only/just the level of a sports car that came with true/decent power out of the dealer's lot (wrx, evo, porsche, mustang, camaro, etc., etc).

280whp is not much. FI + 4.56? Def not overkill. If anything, it will help get you quicker to the higher rpms to be at optimal boost. I mean, it's good and decent; especially being in a light car. But, imo, one should never discount the idea of throwing in a shorter 4.56 FD, just because you threw in an FI kit. Afterall, hot rod and muscle car guys have been installing shorter/quicker FD gears in their 400-600+ rwhp cars for decades...much more than a measly 280rwhp.

[86drift]

I run 5.125 gear with my turbo setup. Makes a big difference to the factory gearing.
Top speed is around 225km/h and there aren't many circuits here where you'd hit that.

The only difference between NA and FI is that you're more likely to top out 6th gear. For most 140mph is enough.

[HUNTERANGEL121]

Originally Posted by M23

I was actually thinking the same thing and recently asked this in a JRSC thread. Also, while trying to find new JRSC videos, I stumbled upon this video with an FRS in it with a SC + E85 + full exh + 4.56 gears. (idk what exactly the wrx has in it nor how much power it makes tho...anyone know??):

Imo, I think a lot of 86 owners are soo used to first driving a low-powered car, that once they get a new FI kit installed, they become excited, maybe overwhelmed and content. But, when you think about it, even after a 280whp FI kit install, it is really not super fast at all still and is basically now only/just the level of a sports car that came with true/decent power out of the dealer's lot (wrx, evo, porsche, mustang, camaro, etc., etc).

280whp is not much. FI + 4.56? Def not overkill. If anything, it will help get you quicker to the higher rpms to be at optimal boost. I mean, it's good and decent; especially being in a light car. But, imo, one should never discount the idea of throwing in a shorter 4.56 FD, just because you threw in an FI kit. Afterall, hot rod and muscle car guys have been installing shorter/quicker FD gears in their 400-600+ rwhp cars for decades...much more than a measly 280rwhp.

Funny how I was just about to link you this thread lol.
Isn't the theoretical top speed like 170 gearing wise?

[luckykevin]

I have already change FD from a 4.1 to a 4.556, with Innovate supercharger. But my supercharger has some problems, so I haven't been able to feel the benefits.

Because my car is automatic, I think it's very important to change FD.

[HUNTERANGEL121]

Originally Posted by luckykevin

I have already change FD from a 4.1 to a 4.556, with Innovate supercharger. But my supercharger has some problems, so I haven't been able to feel the benefits.

Because my car is automatic, I think it's very important to change FD.

I thought auto had a 3.7something FD?

[Efferalgan]

Originally Posted by HUNTERANGEL121

I thought auto had a 3.7something FD?

The FD is the same for MT and AT. Gear ratios inside the gearbox are different.

[HUNTERANGEL121]

Originally Posted by Efferalgan

The FD is the same for MT and AT. Gear ratios inside the gearbox are different.

I think I might be confusing IS300 FD ratios lol.
Thanks

[mrk1]

Also the different forms of boost will react differently. A centrifugal supercharger needs rpm's to build boost so gears go great. A PD supercharger works great at lower rpm's, so if you gear real high you will never utilize that low end punch. Turbo's need time to spool so if your zipping through the rev band and shifting all the time it can be counter productive if you made a large FD change.

[SkAsphalt]

Originally Posted by mkivsoopra

I get wheelspin through 3rd gear at ~350 whp. Shorter gears would be useless.

The car can chirp into 4th at under 300whp on a 255 section rear tire...we have fun cars

[Dipstik-sportech]

Just remember, every time you shift you slow down. Less time spent shifting = faster car, generally.

[cdrazic93]

Originally Posted by mrk1

all you have to do is not drive like a caveman.

When you first boost the motor, I'm sure its hard to not drive like one, unelss Gieco insures you lol.

[M23]

Originally Posted by Dipstik-sportech

Just remember, every time you shift you slow down. Less time spent shifting = faster car, generally.

This fallacy is touted waaay too much here (and other car forums too I bet) imo.

Works both ways..less shifting = slow car. You want a 4spd FRS? lol

Truth is..balance (adjustment/changing ratios) is best per road track course.

[Dipstik-sportech]

Originally Posted by M23

This fallacy is touted waaay too much here (and other car forums too I bet) imo.

Works both ways..less shifting = slow car. You want a 4spd FRS? lol

Truth is..balance (adjustment/changing ratios) is best per road track course.

Well I proved my point on my own car so.........

[Poodles]

Originally Posted by mrk1

I want to change to a 4.44 because to me shorter gears are wicked fun, more shifting is more fun to me. Leaving the car in one gear is dull.

Wheel spin can be cured with tires, alignment settings, and traction control known as your right foot. Spinning helps nothing other then bar stool bragging so why not do what you can to prevent it.

If you're letting off the gas, you're limiting power and it's essentially pointless that you've added that power. What you're wanting is a close ratio gearset (though our 6 speed is a single overdrive unit and already a close ratio because of this), not a higher ratio final drive that will effectively make lower gears worthless.

Originally Posted by M23

280whp is not much. FI + 4.56? Def not overkill. If anything, it will help get you quicker to the higher rpms to be at optimal boost. I mean, it's good and decent; especially being in a light car. But, imo, one should never discount the idea of throwing in a shorter 4.56 FD, just because you threw in an FI kit. Afterall, hot rod and muscle car guys have been installing shorter/quicker FD gears in their 400-600+ rwhp cars for decades...much more than a measly 280rwhp.

Depends on the type of forced induction. Turbos work on load, and if you're gearing is too short, you won't build enough boost AND you'll be shifting too much and losing said boost, ultimately making you slower.


Comparing to hotrods is a moot point as our stock ratio is already the type of ratios they would run back in the day. Running a 4.56 was for rock crawling.

Originally Posted by mrk1

Also the different forms of boost will react differently. A centrifugal supercharger needs rpm's to build boost so gears go great. A PD supercharger works great at lower rpm's, so if you gear real high you will never utilize that low end punch. Turbo's need time to spool so if your zipping through the rev band and shifting all the time it can be counter productive if you made a large FD change.

Correct, you just left out the need for a load to build boost on a turbo car

Originally Posted by Dipstik-sportech

Well I proved my point on my own car so.........

Shots fired!