So I have a laundry list of things for my civics engine and ultimately boosting it to push 20-25lbs. I have pistons, valvetrain, port and polished head and so on so forth. It’s a b16 head with a GSR block 84.5mm. I have a GSR trans and was wondering what can I do to the trans as an upgrade as well? We all know what to get for engine internals but when it comes to transmissions other than clutch and flywheel I never really hear anything upgrade related. I hear people putting LS 5th gear in most transmissions but that’s more for highway luxery. What should I be looking to do to get my trans ready for 25lbs of boost?

 

What power level and purpose? boost pressure simply becomes one side of the cube to worry about.

As for the LS 5TH gear... overrated, and manyy people don't touch it anymore as it throws the car out of its powerband. so, nah.. don't listen to that so much, please.

 

Biggest thing you can do to improve the power handling capability of the transmission is to soften the hit of the clutch. Big boost requires a clutch to match, problem is a clutch to match big boost is going to hit the drivetrain far harder than it needs to. You could temporarily reduce power to keep from breaking parts due to that clutch's harsh hit, but you will make more power in a tighter time frame if you instead just soften the hit of that clutch. Not something you can reliably do with your foot, but there are several products out there that can help...
...Tilton Flow Control Valve http://tiltonracing.com/wp-content/u...trol-Valve.pdf
...Clutch Masters Flow Control Valve http://www.clutchmasters.com/content/FCV2000diagram.pdf
...Magnus Launch Control Device Magnus Launch Control Device ? Magnus Motorsports
...ClutchTamer CLUTCHTAMER.COM
...ClutchTamer HitMaster System ClutchTamer.com

Grant

 

Sure. give that a try. I think it's overkill to say the least, but again it depends upon the purpose of the car to determine if such parts are even needed. but there ste different approaches to everything

 

You leave potential on the table if you don't give it a try. Some work better than others, but that style of mod is the best bang for the buck manual transmission/drivetrain "upgrade" you can make.

 

How much power are you planning on and what types of driving on what size and type of tire? Can't answer your question without that info.

 

I’m gonna be boosting in the future about 20 - 25lbs and it’s gonna be a street car. Not quite a daily but I would like to be able to take it out if I wanted to. As for tires im not sure yet I haven’t gotten that into it. Probably some nice street tires though I don’t want regular ones but I don’t need drag tires

 

I need to know power. PSI means nothing.

 

Again. it depends upon purpose of the car

 

I need a set of those 25psi race gears... do you have them in stock ???

 

Please explain...

 

A road race car with 500whp and a drag car with 500whp will use different ratios and a different LSD. The clearances will also be different if built by someone with a lot of experience building transmissions for specific setups and uses (waves hand and toots his own horn). For the OP a street/strip car with 250whp on a tiny little turbo vs 700whp on a big turbo will use different ratios.

 

I’m gonna say about 500whp. Idk if I’m gonna get quite that high id probably be more around 400 but I wanna be able to handle more than I’m actually pushing

 

I think Aquafina is saying that your street/strip transmission should ideally be built with the proper ratios/clearances for the power you are currently making. As power level goes up, at some point you will likely need to change ratios to get the most out of it.

I'm telling you that you will be able to put even more power thru any of those available gearsets, regardless of power level, when you properly manage the hit of the clutch.

Grant

 

For 500whp street/strip I would do a GSR with the whole trans refreshed (bearings, seals, carbon-lined synchros, selector sleeves), MFactory helical LSD, MFactory 3.07 1st gear and Torco RTF. If it's going to be a track car (road course) it will need different ratios and gears rated for the appropriate power.

 

gears

 

Dog gears are a horrible recommendation.