Infinitude 4.64 Final Drive Group Buy - $550 shipped
This is a group buy for an Infinitude 4.64 Final Drive for $550 shipped in the cont'l US (see below):
Replaces your granny-geared OEM final drive gear and matching countershaft. Going with a lower geared (higher numerical) unit will improve your acceleration and torque applied to the pavement. You sacrifice top end, but not many of you probably hit over 130mph, anyhow!
Torque/acceleration will roughly increase by these amounts and top end speed will decrease by these amounts. Speedometer readings will not be affected.
This unit is made of high-tensile forged steel that is then heat treated and shot peened. This is a very sturdy unit. This is NOT recommended for hard-core drag use, and professional installation is recommended. IMRPOPER INSTALLATION may destroy the gear and your tranny! See below for our installation services.
Sorry, but this unit will NOT work on the 97-01 TypeSH.
These units are in stock and ready to ship!
Infinitude 4.64 Final Drive for $550 shipped
Shipping included in the price for continental US only. WILL ship internationally, please PM me for additional shipping cost. I will not upcharge shipping, be sure to let me know if you need air ($$$) or if surface is OK.
Unit requires professional installation. OK for the shadetree mechanic equipped with a Helm's manual and the tools called out. Professional installation available in the D/FW metroplex, please contact for more info.
Very tempting. I'd love to have 9% more torque for track days, but since I drive mostly on the street and occasionaly at the track I'd better leave it alone to keep my gas mileage at about 29 mpg.
Simply because I have no data on usage. The mfr. claims that they hold up fine but I have not monitored any personally through heavy drag usage.
Given the mfrs. claims and the construction, I have no reason to doubt that they would be OK. What I am concerned about is selling them to people that would do something to them that would break an OEM FD (i.e. 500WHP with 10" slicks and hardened axles).
There are examples of these running in track cars with LSDs that are running 225 or wider race tires in Honda Challenge with no problems, though these are all generally under 250WHP.
Hmm...would this be good for the slightly modded lude ie. I/H/E?
Im not a hardcore dragger, but the occasional street/track racer, if it would last me a lifetime under those conditions (as a OEM basically would) I might be willing.
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It would work fine for you. It certainly would be good for mild mods, it will improve your times noticeably. If you don't mind the tradeoff of top speed it's effectively free power.
this will help any lude with power. No more worring about falling out of vtec on early shifts, your revs will always be in the power band. i dont see why this is not a big seller. Its like putting a type r trans in your prelude.
the main problem I see is with loss of top end issue. The 5thgen already cruises on highways at a cringing ~4k rpm, and most people don't really want to make it worse. I see the FD is a wonderful option for those who track/autox and tow their cars to these events. I know I'd take it in a heartbeat if this weren't my daily driver.
a suitable solution is to somehow extend only 5th gear, perhaps by using an accord 5th gear. I have not yet seen SOLID evidence of this being done, maybe I havent searched enough. Some have claimed that you need to machine the gears down to fit or something of the sort... OR perhaps Todd could have Infinitude come up with a custom 5th gear gear set?
The 4.64 ratio FD is an 8.8% increase in the FD ratio, which increases the RPMs at any given landspeed by 8.8%. If you're turning 4,000 RPMs at 80 MPH, with the new FD, RPMs would be around 4,350, not a terrible increase, IMO. Well worth the trade off for increased acceleration.
Also, keep in mind the FD does not affect the RPM drop during shifting. The RPM drop is the same as stock. The only way to adjust the gap in RPMs during shifting is to change the actual gear ratios.
I am already working on a close-ratio gearset. Not an extended 5th gear, though. The Accord one should work fine, though, without modification. I find it pretty annoying, though, to have a large drop in RPMs from 4th to 5th, especially at track days.
RPM drop from 4th to 5th at 7600 RPMs is only 1630 RPMs. How much tighter would you want them? RPM drop is about 21.5%, so even running the engine up to 8000 RPMs, the rev drop is only 1720 RPMs!
If you want tighter gearing, go with the 4Gen VTEC gears. 4th to 5th rev drop at 8000 RPMs is only 1500 RPMs!
A stock 5Gen has the following rev drops at 7600 RPMs 3075, 2378, 1753, and 1632. My semi-optimized tranny has RPM drops of 3075, 2378, 1544, and 1426. My first attempt a close ratios would be 2280, 1763, 1544, and 1426. This would use stock 3rd, 4th, and 5th gears from a 5Gen and 4Gen VTEC. The only custom gears would be 1st and 2nd, which unfortunately, require a new mainshaft. With a final drive, 1st is almost useless, hence the reason why I'd look at 1st and 2nd while keeping 3rd, 4th, and 5th.
The problem is that I'm not sure what standing starts would be like with this gear set. Land speeds on a stock 5Gen with stock sized tires would be 35, 59, 86, 112, and 142 MPH at 7600 RPMs. With my proposed gearing the land speeds would be 46, 66, 86, 108, and 133, with a 4.714 FD. With a 4.64 FD, the land speeds change to 47, 67, 87, 110, and 135. With a stock FD, it's 51, 73, 95, 119, and 147. It's unnecessarily high, which is what the FD would fix. I wouldn't make a close ratio gear set based on the stock FD, as that's going to screw everything up, IMO.
Again, this is just my opinion. I'd be willing to let you give my gearing a try on the track sometime. I keep offering, but you keep saying no!
That being said, if the ratios are anything like this, I'll be the first to sign up for a close ratio gear set!!
How does that affect the RPM drop? The FD just affects how fast the differential (and hence the wheels) are spinning in relation to the gear set. It doesn't affect any relationships between the gearsets themselves, hence the RPM drop stays the same regardless of FD ratio.
Quote:
Originally Posted by Craig98lude
It will because when you shift in the next gear you will be at a higher rpm then you would with the stock final drive. How would you not?
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