76GTS vs PT-88
01-01-2010, 03:22 PM
#1
76GTS vs PT-88 Curious what the difference in lag will be between a 76GTS and a PT-88. This will be going on a forged 355, PTK turbo kit (real one)A2W. I am in the process of deciding whether to keep the 76GTS and have it turned into a 80mm or go to the PT-88 which will require a bit of work as far as modifying my existing kit goes. The 88 will also allow me to reach my goal of 950rwhp. Thanks in advance.
01-02-2010, 10:49 AM
#4
From what I've seen, the T88 makes equivalent power to a T76 at the same boost levels. Even though the compressor wheel is more efficient, the turbine wheel is old-tech and less efficient. However, then the T76 hits its choke limit, the T88 will keep on making power. The point is that you have to run a lot of boost/power for the T88 to shine.
IMO, check out the ST80. It has more efficient wheels in it than the T88 and is bigger than the T76, making it a better all-around turbo than either.
IMO, check out the ST80. It has more efficient wheels in it than the T88 and is bigger than the T76, making it a better all-around turbo than either.
01-02-2010, 04:33 PM
#7
From what I've seen, the T88 makes equivalent power to a T76 at the same boost levels. Even though the compressor wheel is more efficient, the turbine wheel is old-tech and less efficient. However, then the T76 hits its choke limit, the T88 will keep on making power. The point is that you have to run a lot of boost/power for the T88 to shine.
IMO, check out the ST80. It has more efficient wheels in it than the T88 and is bigger than the T76, making it a better all-around turbo than either.
IMO, check out the ST80. It has more efficient wheels in it than the T88 and is bigger than the T76, making it a better all-around turbo than either.
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01-02-2010, 10:17 PM
#9
T88 or PT88? My PT88 breaths fire compared to the T76's that I have seen around here. It's not even in the same ballpark. I bought the turbo used. It was previously on my friends Grand National running 8.8's in the 1/4 at almost 30 psi. I've got it set at a solid 15 psi right now and expecting to see 9.3's Wednesday night when the track reopens.
01-02-2010, 10:35 PM
#10
PT88. My car went 146 mph at 17 psi at full weight with a 76GTS. ForcedInductions.com did a back-to-back dyno test with the 76GTS and PT88, which is where I got my info. At 1000 hp, they were within 20 hp of each other, but the 76 was at choke and the 88 had more to go. The PT88 has an old-school turbine wheel.
Last edited by 355TurboLT1; 01-02-2010 at 10:37 PM. Reason: spelling
01-03-2010, 01:18 AM
#11
Interesting although you rarely see the 76GTS even break 900rwhp.Come to think of it I never have. I was always under the inpression that was out of its reach. This is the main reason I want to go to the PT-88. I also looked into the 80mm upgrade which is claimed to bring another 100hp or so to the table. Im kinda worried about the street behavior with the PT-88.
ForcedInductions.com got 99x rwhp out of a 355 LTx/T76GTS and T56, then pulled 150.x in the quarter. They reported the turbo was max'd out and peaked at ~24 psi then dropped a few psi from there. My own car backed up these results with a 146 mph pass at 3750 lb and only 17 psi.
We built a 377 SBC, carbureted with a T-76GTS and dyno'd on an engine dyno. It made 92x fwhp and 1080 ft-lb. The highest we ran the boost was 18 psi, while the turbo is good for 20+ on that engine.
There are a whole slew of Supra's making 1000 rwhp +/- using the T76GTS. Granted, the 76 is a little more at home on a 3.0 than a 5.7.
Wolverine on turbomustangs.com is claiming 1100 rwhp using a 42-76, which has the same wheels as the PT76GTS. Axeman on the same site made 840 rwhp with the 76GTS through an AOD. Brent Davis made 880 rwhp with a PT74.
Mike
01-03-2010, 02:59 AM
#12
Mike- Great info. I was not fully aware the test results between the 76GTS and the PT-88. It sounds like the 76GTS is plenty capable. I might just send it out to Jose at FI to have it turned into an 80GTS. That way I won't have to run it past it's limits to attain my power goals. So are you still runnng a 76 on your car? How is the behavior on the street? My compression is right at 8.5-1 and I am using AI's 200cc heads on a fully forged 355. I plan to run meth as a precautionary measure. I would be happy with 900rwhp. If I dont have to go to a PT-88 that would be great. Thanks again for the results regarding the 76GTS
Last edited by 355TurboLT1; 01-03-2010 at 03:02 AM. Reason: addition
01-03-2010, 10:24 AM
#13
The 76GTS is still on my old car but I sold the car. Street manners were great. I didn't spool on accident, but spooled up fast when you wanted it. I remember data logs showing less than 1 second to full boost. Keep in mind, though, that I was running 388 cid (which isn't even supposed to work with the 76GTS), so it spooled a tad quicker than 355 will.
Mike
Oh well looks like its the PT-88 for me.