|
|
|
01-12-2009, 11:06 AM | #1 |
First Lieutenant
16
Rep 331
Posts |
Pistons
What kind of boost levels (aggressive everyday driving) would likely fry-up the stock pistons/rings? If your driving the JB3 hard daily would you be at risk over say 4-5 years?
|
01-12-2009, 12:00 PM | #2 |
Lieutenant
21
Rep 513
Posts |
dont think u will get a good answer here...this engine isnt old enough to really say whats safe and wats not....im having a hard time dealing with the fact that the supra's 2jz.gte can handle around 550-650lbs torque easy..and our very adanced motor doesnt seem to...ours should handle more since everything is beefy and forged etc. both are 3.0 inline 6 cylinders twin turbo charged....they dont have the fuel system like we do but still the fact remains thats one of the best engines and transmission ever im really hoping that ours will match up
__________________
09 135i montego blue 6speed..RR catch can,CDV,DCI intakes,stett charge pipe and tial bov, the above mods are not installed on my car, i just want to seem cool
Devils own water/meth dealer-PM me for info former car/ 2001 audi TT ~290bhp :w00t: |
Appreciate
0
|
01-12-2009, 12:36 PM | #3 |
Major
63
Rep 1,159
Posts |
^^ you brought up a good point, which I've been wondering the same thing for a very long time. Modern engines just aren't as moddable for big power as before. Some blame the electronics, but I think those electronics just keeps everything safer. Hope some engine guru can shed some light on that matter.
Sorry for the thread jack :P |
Appreciate
0
|
01-12-2009, 06:32 PM | #4 |
Enlisted Member
2
Rep 40
Posts |
I'm more worried about the turbos. With the JB3 the turbos are running close to 200% of what they are supposed to run. The turbos will be the first to go running a tune.
__________________
-BZ
|
Appreciate
0
|
01-12-2009, 08:29 PM | #5 | |
New Member
0
Rep 6
Posts |
Quote:
|
|
Appreciate
0
|
01-13-2009, 09:19 AM | #6 |
First Lieutenant
16
Rep 331
Posts |
I might have to agree, JB3 at 14psi = 175% of stock boost, that cant be good long term. Its like asking an undersized/speedy running back in the NFL to be any every-down running back all season long . . . . they usually "hit the wall" pretty quick if over-used. Similarly, the battering on small turbos adds up eventually.
|
Appreciate
0
|
01-13-2009, 10:55 PM | #9 |
Lieutenant
11
Rep 591
Posts |
Also car manufactureres are making the engines out of softer material so that their engine tooling machinery (grinders, die cutters, lathe cutters etc ) last longer so as to save on costs.
They get better at it as the years roll on. Newer chev and Ford small blocks can sometime have a problem with torque twist in higher HP motors because of this. The older blocks are better because of over engineering. Maybe this could also be a limiting factor. |
Appreciate
0
|
01-14-2009, 10:23 AM | #11 |
First Lieutenant
16
Rep 331
Posts |
|
Appreciate
0
|
01-14-2009, 10:39 AM | #12 | |
Banned
76
Rep 5,970
Posts |
Quote:
The Supra engine was overdesigned because that was a safer, cheaper alternative to extensive testing. They created a very robust design that will last forever at stock power levels and the aftermarket exploited it. With the N54, we're several generations of engineering later, and there's enough data so that a design can be safe and robust at stock power levels without the huge safety margin that was built into engines like the 2jz. What benefit is there for BMW to spend time and materials designing an engine that will handle 700Hp when they never intend for it to see more than 350Hp? It doesn't make sense from the manufacturer's point of view. |
|
Appreciate
0
|
01-14-2009, 11:25 AM | #13 | |
Lieutenant
21
Rep 513
Posts |
Quote:
__________________
09 135i montego blue 6speed..RR catch can,CDV,DCI intakes,stett charge pipe and tial bov, the above mods are not installed on my car, i just want to seem cool
Devils own water/meth dealer-PM me for info former car/ 2001 audi TT ~290bhp :w00t: |
|
Appreciate
0
|
01-14-2009, 02:48 PM | #14 | |
First Lieutenant
16
Rep 331
Posts |
Quote:
|
|
Appreciate
0
|
01-14-2009, 04:16 PM | #15 |
Major
28
Rep 1,000
Posts |
I keep hearing about 135's with 350bhp having traction problems at dragstrips. Dragstrips with prepared surfaces.
If you can't get the power to the road isn't it useless? My car is a daily driver. I do not get to use much of its potential. The little bit I do get to punch it, shouldn't hurt it to much. It will not see high boost but a fraction of the time. JMHO |
Appreciate
0
|
01-14-2009, 07:28 PM | #16 | |
Lieutenant
21
Rep 513
Posts |
Quote:
__________________
09 135i montego blue 6speed..RR catch can,CDV,DCI intakes,stett charge pipe and tial bov, the above mods are not installed on my car, i just want to seem cool
Devils own water/meth dealer-PM me for info former car/ 2001 audi TT ~290bhp :w00t: |
|
Appreciate
0
|
01-14-2009, 09:05 PM | #17 | |
Banned
76
Rep 5,970
Posts |
Quote:
By the time you've hit 30MPH traction really isn't an issue any more with good tires. |
|
Appreciate
0
|
01-14-2009, 09:06 PM | #18 |
Lieutenant Colonel
223
Rep 1,565
Posts |
If you are mature with your mods and vigilant about maintenance I see no reason why your car would not make it to 150K (if you keep it that long).
In your case I would run the JB3 at the low boost setting and change that oil twice as much as the factory recommends. Our 135i has had 3 oil changes with ~3K on the clock (a bit excessive for a DD, but we track this car a lot). On the track with the JB3 on low boost we run 100 octane only, although the recommended octane rating is only 91. Taking good care of your stuff doesn't mean we can't have a little fun with them! |
Appreciate
0
|
Post Reply |
Bookmarks |
|
|