Thread: P11 Transmission Article

Dont get your panties all up in a bunch. All I did was offer some insight and advice and correct some information.

BTW 6 speed gearboxes are 100X more plentiful than p11/b15 boxes and yes this includes the QG18 gearbox which uses the same gearstacks as the p11. So spare parts can be easily sourced for cheap. I see 250-300 dollar 6 speed boxes all the time. So yeah.

Again I get the fact that road racing on tracks like that are hard on parts. I also can see why they went their route. Again im not saying its wrong, im just throwing out some suggestions and correcting some misinformation about the swap.

These OG's are not stupid. Never said that and me questioning why they went the way they did and offering some suggestions is not me calling them stupid. Its simply asking questions and the result of that is a good debate. If you cant stand a little debate because you get butthurt when someone asks a question or offers maybe a better solution then leave.

This forum is here for people to grow and learn from each other. In turn they provided some good information in a debatable format. Simple as that. No hating, no arguing, no calling names needed. Just simple debate and answering questions.

Errrrrr, who called anyone names

Nobody, Im saying there doesnt need to be. lol

Naw baws. Shockweight is 75w90 that has a film thickness of 250w. There's some cool chemical engineering that goes into that stuff.



The reason I say this is because it's petroleum-based, not synthetic, which is generally good for 260* before it starts breaking down. Big heavy trucks are engineered as big heavy trucks. What they lack in cutting edge lubricants, they make up for in capacity. Engines use 15 gallons of oil, diffs hold at least 5 gallons, etc. These trucks see huge loading, but they never see huge temperatures.

Conversely, a Sentra was designed for 140hp and 3k gross. We need to make up for the lack of capacity with fancy fluids. I'm glad the Valvoline works for you, but the Redline works pretty well for us.



True, but again, the Spec V trans is better served in Martin's car, which will actually be a max power car that is driven on the street. The weight is less a concern, the 6th gear will be nice for cruising, and the extra torque holding will be put to better use.



I've never liked cable shifted transmissions. This includes my father-in-law's dune buggy, which has a 100% solid-mounted drivetrain. Feels more clunky and vague than my solid-linkage setup in my buggy.



Pinche frijole!




I've seen more QG18/P11/B15 SR20 boxes on car-part.com, probably because these vehicles are valued less and are more likely to be in the scrapyards. Yes, some dude on the forum may very well have one for cheap on a part out, but I'd prefer to deal with someone who knows how to ship things, gives me a warranty, ships promptly, and will refund my money without spending it on something else. Hard to find one local.



No problem. I have no problem with suggestions. If that's all you meant, then let me give you a suggestion: starting a suggestion by telling someone they're behind the times isn't conducive to a sane conversation. Expect people to get shittay.



Meh. Forums are for ARGUING!!!! YOUR MOM BLOWS GOATS, I HAVE PROOF!

Ill admit I didn't start of the "arguement" properly but yes, I was only making suggestions and asking questions. No shitting meant by it.

Again you guys have broken plenty of boxes with the Shockproof so why not give the Synthetic Durablend Valvoline a shot to make a comparison. Again its something that cant hurt and who knows, it may actually show benefit and make the gearbox last longer. Just throwing it out there. Figured it would be a nice comparison and what would it hurt to try?

Anyways, no harm done. Keep up the good work.

BTW, my car is strictly a drag car and I have a 6 speed

I dont use 2 of my gears but it doesnt take away from the fact that its proven stronger and so far bullet proof. But the extra weight up front over the wheels is good in my case. And no penalty points on my end for having 6 gears and extra weight.

I gotta say for 230whp/wtq I can't say you really need much more then a P11 trans even for road racing. For daily B13/B14 trans is enough. Thus I can't blame Rockwood for sticking with the P11 trans. Plus weight penalty of the 6 speed for already heavy P10 does suck too.

We may experiment with a heavier synthetic MTL if this trans fails, but for now we'll stick with what we know. I've had extremely good luck with Kendall Sythetic MTL in my buggy, which abuses transaxles FAR more than your car and our racecar combined.

I've personally exploded a number of 32V trans in my SE-R (which made almost as much torque as your car), but this is the first trans failure for our G20.

@Rockwood, where can you pickup a few quarts of the Kendall Synthetic MTL??

Local dune buggy/off road shops all seem to stock it. It's called Kendall Three Star and is available in 75w90 and 85w140. You'll need limited slip additive if you've got a clutch-type LSD. Gear type/ball-o-snot doesn't need it. Google!