How much hp is an SR good for?

[Got Boost?]

as far as how far can i push it without the need to upgrade crank and rods and crap?

[I H8 UR DSM]

as far as how far can i push it without the need to upgrade crank and rods and crap?

Probrobly down the block...

:rolleyes

[Sintax]

haha, maybe you might be able to get it a little past that if you put your big bad DSM motor in it, if you can keep the crank from walkin.

it all depends on how well you tune it, thats kinda a broad question.

-scott

[I H8 UR DSM]

I would definitly recommend upgrading the "crap" at around 350hp...the "crap" usually gets kinda runny at that level...

[Got Boost?]

ok let me re-phase....

on a stock bottom end, what is the max hp that an SR motor is good for?

not what you can do on the stock inefficient turbo, not what the stock fuel system can handel, but what is the motor good for?

[battyx]

Well, seems to me that 400rwhp +/- isn't that bad of an estimate. But why push it? Upgrade the internals so you can woops some *** without sweating bullets by 6800rpm...

[jbsr20fiend]

I'd play it safe and stay around 350whp. After that go with rod, piston, bearings, etc. I wouldnt blow up my $2000 engine just to see if i could get a little more power out of it. Play it safe and kick some ***. Late.

[I H8 UR DSM]

ok let me re-phase....

on a stock bottom end, what is the max hp that an SR motor is good for?

not what you can do on the stock inefficient turbo, not what the stock fuel system can handel, but what is the motor good for?

400-450hp....its all very debateable, and depending on tuning methods, devices, experience, and engine management you might break at the 250whp barrier...or you might be able to tune the car to 450hp without breaking anything....its a different case senario for each tuner...but the "usual" answer to that question is "400-450hp"....

i dont think i have ever seen any crank upgrades or problems.

pistons and rings and rods are usually done by people at around the 400hp mark....some people dont think the stock headgasket should reach that level, its been shown it can, but i have seen them blown at the 300hp mark.

rocker arms are good to upgrade whenever you have the head apart (cam upgrading or whatever), and valve springs.

jesse

[mattback]

eleventy billion horespower. how much will it cost???

$ Texas

[James]

Is there a break down as to what is good to what...Like I can tell you the limits of most things like block and rods rings pistons, etc..Thanks-James

[Got Boost?]

400-450hp....its all very debateable, and depending on tuning methods, devices, experience, and engine management you might break at the 250whp barrier...or you might be able to tune the car to 450hp without breaking anything....its a different case senario for each tuner...but the "usual" answer to that question is "400-450hp"....

i dont think i have ever seen any crank upgrades or problems.

pistons and rings and rods are usually done by people at around the 400hp mark....some people dont think the stock headgasket should reach that level, its been shown it can, but i have seen them blown at the 300hp mark.

rocker arms are good to upgrade whenever you have the head apart (cam upgrading or whatever), and valve springs.

jesse

thanks!

[Movingviolation240]

I don't think you could push an SR around the block, just because it's aluminimum it's still pretty heavy.

I'd say that 350-375hp is going to be safe, you could do 400 but not for long (hell you could do 500 but only once).

The rods in the SR are super strong, just like the CA (fordged and shotpeined from the factory) so as long as you don't detonate they should be good way beyond 'streetable HP levels' I.E. well past 400rwhp. The pistons are allright, but can become brittle and weak with the heat, and they will eventually fail. The stock rings also wouldn't put up well with the beating they receive at and above the 400hp level. Thankfully you can just replace them when you go to fordged pistons.

As for the bearings, when you pull the motor appart just put new stock replacement ones back in, that should be fine.

My motor (abet it's a CA) is running stock rods, crank, bearings, and fordged pistons bored 1mm over. You can't bore an SR (gets the walls too thin and they flex) but it gives you an idea about what it takes to make power.

PaulOrlando, FL

[jbsr20fiend]

Yeah, I have to agree, its all how you tune the car. I was wondering about the durability of the rod bearings. I heard that the sr is prone to spun bearings.

[ItzGenX]

You can't bore an SR? Are you sure about that one? If so, why does TODA sell 87mm bore pistons? Also their stroker kit comes with 87mm bore pistons. That's 1mm over stock.

[Movingviolation240]

you can bore anything, but will it hold up........ that's the question.

With the pepsi can aluminimum block you can run into issues with the cylinder sleves being too thin and starting to flex like a tin can under pressure.

TODA and JUN both sell sleve kits to get around this problem, and that's one of the reasons their kits are soo damn expensive.

later,

Paul

[ItzGenX]

ahh ok thanks, so i guess i'll get 86mm pistons and upgrade rods, screw the stroker.