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More "realistic" power increases / engine reliability, etc...
Lee Alessi (McInfantry) & I were Bsing around back channel partially from some different threads about 4BT tweaking.. Both he & I were a little worried that hte threads with 350hp / 400 hp (not that there is anything wrong with them) but people start reading 400 hp or 350 hp and believe you can do that easily with a 4BT when I think both he & I don't necessarily agree...
Here is a thread where a guy blew up his Bosch VE pump at 320 hp because his (performance) injections (still) could not no release enough fuel..
http://www.dieseltruckresource.com/dev/showthread.php?t=84054
With an inline pump this may be different..
Lee was talking to another guy in another thread about 4BTs and tweaking, on IFSJA (International Full Size Jeep Association),
http://www.ifsja.org/forums/vb/showthread.php?t=61289 and this thread largely came out of it...
His big thing is that you can tweak that high but will it be reliable in the same fashion that our 4BTs are currently reliable (200K miles + usually)... He was saying if a 4BT gets less than 100K miles is it reliable? I personally don't think so..
I posted this up in response on that thread:
So guys looking to tow and large rigs etc, the motor will have to be really tweaked and the question is, will it still be reliable and cost wise still worth it?
Comments/thoughts?
Open discussion here, curious what you guys think... :smile:
Lee Alessi (McInfantry) & I were Bsing around back channel partially from some different threads about 4BT tweaking.. Both he & I were a little worried that hte threads with 350hp / 400 hp (not that there is anything wrong with them) but people start reading 400 hp or 350 hp and believe you can do that easily with a 4BT when I think both he & I don't necessarily agree...
Here is a thread where a guy blew up his Bosch VE pump at 320 hp because his (performance) injections (still) could not no release enough fuel..
http://www.dieseltruckresource.com/dev/showthread.php?t=84054
With an inline pump this may be different..
Lee was talking to another guy in another thread about 4BTs and tweaking, on IFSJA (International Full Size Jeep Association),
http://www.ifsja.org/forums/vb/showthread.php?t=61289 and this thread largely came out of it...
His big thing is that you can tweak that high but will it be reliable in the same fashion that our 4BTs are currently reliable (200K miles + usually)... He was saying if a 4BT gets less than 100K miles is it reliable? I personally don't think so..
I posted this up in response on that thread:
So my finaly $.02 is probably upto 250 hp but I think fuel mileage will suffer and I really don't know the results. I think 160-200hp is optimum and will not cuase much/any damage at all to a 4BT and probably won't affect mileage too much...I'm on my second 4BT.. I think 250 hp is probably reliable with a 4BT but I'm not 100% sure.. I'd say I easily got well over 160 hp completely stock just by turning up the pump, but it is true, mileage went down drastically. Noisewise, in stock form with not too much fuel I think they sound exactly like a gen 1 (89-93) Dodge, maybe a hair louder but not much. When I turned up a lot and had a lot of fuel at idle, and gobs, I mean gobs of power bone stock, it sounded about that of an early 24 valve, loud as hell, almost bone jarringly loud.. anyway, I think about 250 hp max is about right out of a 4BT/rotary IMO, also without losing some relability. I previously would say about 200 hp except that I saw the dyno results that were up on the new 4BTswaps.com site at 183 hp completely bone stock other than fueling increase and that is not all the way up. With the right turbo and some cooling I think you could get it.
But that said, I must say honestly I agree with lee. It is not the HP that matters, its the torque. At 160 hp (which is less than my old *** saab), my FJ55 land cruiser wago, sprung over, 35" tires, 5500 lbs, HAULED ***. I got pulled over going 83 mph with lots of power to spare up the steelest freeway incline around here (we have some big long inclines here in Utah).. Cop was impressed enough that he actually let me go LOL. But that was when I had it turned up. I eventually went pretty close to stock, about 120 hp in the end (I had a 4BTA), I had a HX35 turbo on with the 12cm2 housing, and it powered my truck absolutely great, no loss of mileage at all except going up hills of course..
The guys wanting/expecting big HP can do it but it does take $$ and lowers your mileage significantly.. Stock 105 hp is 265ft/lbs. stock 120 hp is 305 ft/lbs, more than most stock V8s. Somewhere around 140-150 I think you reach 400 ft/lbs. That is more reasonable and won't compromise mileage too much at all.. My $.02 on it..
So guys looking to tow and large rigs etc, the motor will have to be really tweaked and the question is, will it still be reliable and cost wise still worth it?
Comments/thoughts?
Open discussion here, curious what you guys think... :smile: