Where are all the AMS 50trims????
May 16, 2007 | 11:36 AM
#49
Again don't want to misinform but I believe it is the value of the area divided by the radius? The larger the hotside (area) for the same radius(same exhaust side turbos) the laggier it will be and the less backpressure it will cause.
The advantage to running a big hotside is that it is less likely to be a restriction up top at high RPMS/Boost levels, while most people run small ones for quicker spoolup.
Scorke
The advantage to running a big hotside is that it is less likely to be a restriction up top at high RPMS/Boost levels, while most people run small ones for quicker spoolup.
Scorke
May 16, 2007 | 11:52 AM
#50
Here is a sheet of the most powerful/tqy Green to date. See the peak/drop off? That's why I am saying the 50 trim is superior if you are worried about power after 5k, vs the Green is a sick turbo down low. He loses 200 ft lbs from peak to redline and about 70whp while most built 50 trim's lose far less at the expense of revs.
My 30R made 20 more hp and 10 more ft lbs of tq at 5 psi less than what this guy used to make these numbers on his green, and was only marginally laggier.
Scorke
l8r)
May 16, 2007 | 11:57 AM
#51
Ludi I think the 50 trim would offer a good bit of HP over the green, it would make similar peak tq but later in the power band.
50 Trims usually make 400ish on pump from what I have seen, I agree if pump gas was the only thing your car was going to run the green would be superior by far, but most of those spending 2k on a turbo upgrade are going to want to take full advantage off it with octane or meth or something down the road.
I know lots of people that take stock valvetrain to 8500, although not super safe lots of people do it.... I think saying that you need 8500+ in terms of redline to make the 50 trim worth it over the Green is innaccurate unless you are only using pumpgas.
Scorke
50 Trims usually make 400ish on pump from what I have seen, I agree if pump gas was the only thing your car was going to run the green would be superior by far, but most of those spending 2k on a turbo upgrade are going to want to take full advantage off it with octane or meth or something down the road.
I know lots of people that take stock valvetrain to 8500, although not super safe lots of people do it.... I think saying that you need 8500+ in terms of redline to make the 50 trim worth it over the Green is innaccurate unless you are only using pumpgas.
Scorke
May 16, 2007 | 03:17 PM
#52
Ludi I think the 50 trim would offer a good bit of HP over the green, it would make similar peak tq but later in the power band.
50 Trims usually make 400ish on pump from what I have seen, I agree if pump gas was the only thing your car was going to run the green would be superior by far, but most of those spending 2k on a turbo upgrade are going to want to take full advantage off it with octane or meth or something down the road.
I know lots of people that take stock valvetrain to 8500, although not super safe lots of people do it.... I think saying that you need 8500+ in terms of redline to make the 50 trim worth it over the Green is innaccurate unless you are only using pumpgas.
Scorke
50 Trims usually make 400ish on pump from what I have seen, I agree if pump gas was the only thing your car was going to run the green would be superior by far, but most of those spending 2k on a turbo upgrade are going to want to take full advantage off it with octane or meth or something down the road.
I know lots of people that take stock valvetrain to 8500, although not super safe lots of people do it.... I think saying that you need 8500+ in terms of redline to make the 50 trim worth it over the Green is innaccurate unless you are only using pumpgas.
Scorke
AFAIK, the 50 trim is supposed to be a great pump gas turbo - which it is. IMO it is not a good race gas turbo, since it starts to taper off very quickly in the upper RPM range. 50 lb/min just isn't enough to really take advantage of the power available with race gas. Heck, I'm hitting ~50 lb/min on pump gas. Racegas is where the GT30's and GT35R's start to shine. The 50 trim does ultimately make more power than an FP Green, there is no doubt about that., but if you look at the racegas and 93+meth dyno charts of 50 trim setups, they also taper fairly quickly.
The only thing I'm trying to point out to people is that:
On pump gas, with a stock block, the FP Green is the better choice. It is cheaper and is as fast, if not faster than a 50 trim on that type of setup. I can only thank God that I got my 50 trim for road racing and not street use, because I'd be pissed...
l8r)
May 22, 2007 | 09:55 AM
#54
Evolving Member
Joined: Dec 2006
Posts: 391
Likes: 0
From: Palatine, IL
Again don't want to misinform but I believe it is the value of the area divided by the radius? The larger the hotside (area) for the same radius(same exhaust side turbos) the laggier it will be and the less backpressure it will cause.
The advantage to running a big hotside is that it is less likely to be a restriction up top at high RPMS/Boost levels, while most people run small ones for quicker spoolup.
Scorke
The advantage to running a big hotside is that it is less likely to be a restriction up top at high RPMS/Boost levels, while most people run small ones for quicker spoolup.
Scorke
This is a formula used to determine the size of an exhaust housing. Larger numbers designate a higher volume internal passage for exhaust gases to flow through. Larger A/R numbers also determine the rpm range in which a turbocharger will enter into its efficiency range. Higher number A/R's require greater exhasut gas energy/velocity to spin a turbine wheel than smaller sized housings of the same turbine wheel trim. Exhaust housings can have the same turbine wheel trim and many different A/R's.
Last edited by Tom W; May 22, 2007 at 09:57 AM.
Jun 11, 2007 | 04:32 AM
#57
Newbie
Joined: Apr 2007
Posts: 12
Likes: 0
From: Puerto Rico
We are very happy with the 50 trim. With 2.151 lts, 272 cams, apex power FC, C16 gas. 520 hp with 511 torque at 28 psi. This is with a time trial setup. 540 hp are possible. But we donot need that kind of power. We are just using 485 in a short race track
Jun 11, 2007 | 08:19 AM
#58
You must be on a 2.3L block to make that kinda tq......
Jun 11, 2007 | 10:03 AM
#59
Has this car been to the strip? Would like to see the track times for those numbers.