Rear mount turbo dyno results are in
05-11-2005, 05:09 PM
#1
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Location: Crowded SW Florida
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Rear mount turbo dyno results are in
Got the dyno tune done today, 498 RWHP & 579 RWTQ:
Dyno results
The tuner was surprised by the lack of lag. He didn't mess with the Greddy Electronic Boost Control, and as such couldn't get it to the 15 PSI he was shooting for, so I have some more fine tuning to do.
I'm real happy with the results
.
Dyno results
The tuner was surprised by the lack of lag. He didn't mess with the Greddy Electronic Boost Control, and as such couldn't get it to the 15 PSI he was shooting for, so I have some more fine tuning to do.
I'm real happy with the results
.
05-11-2005, 05:25 PM
#2
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Join Date: Mar 2003
Posts: 30
Re: Rear mount turbo dyno results are in
NICE 
do you happen to know how much power ur motor made without hte turbo?
I am going to run hte same setup on my TA but with a 67mm turbo, hoping for 500-550hp out of the thing on 10psi.
got any more pics of hte setup other than the onces on your webiste?
do you happen to know how much power ur motor made without hte turbo?
I am going to run hte same setup on my TA but with a 67mm turbo, hoping for 500-550hp out of the thing on 10psi.
got any more pics of hte setup other than the onces on your webiste?
05-11-2005, 05:30 PM
#4
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Re: Rear mount turbo dyno results are in
Originally Posted by BlackRamair95ta
NICE
Do you happen to know how much power ur motor made without the turbo?
I am going to run the same setup on my TA but with a 67mm turbo, hoping for 500-550hp out of the thing on 10psi.
Got any more pics of the setup other than the ones on your website?
Do you happen to know how much power ur motor made without the turbo?
I am going to run the same setup on my TA but with a 67mm turbo, hoping for 500-550hp out of the thing on 10psi.
Got any more pics of the setup other than the ones on your website?
, I was not that curious. Chevy High Performance used the same stuff on a 350 (where I got the idea) and made 429 FWHP. I'm figuring at a 20% drivetrain loss, I'm around 620 FWHP at the 8-9 PSI he was getting with the EBC setup as it was.The GT67 is a better turbo from what I've researched, so 550 FWHP should be a breeze.
The only pics I've got are on the website.
05-11-2005, 08:54 PM
#6
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Re: Rear mount turbo dyno results are in
That seemed odd also... according to the paper graph, peak power is at 4700 RPM and then drops off. I'll have to call the guy @ the dyno & ask about that.
I'm sure a lot of this is the boost controller, I thought the Greddy was easier to program based on the reviews I read... no such luck
. Probably should have just gone w/ a manual boost controller, but on the upside, I think the EBC helps to reduce the lag.
I'm sure a lot of this is the boost controller, I thought the Greddy was easier to program based on the reviews I read... no such luck
. Probably should have just gone w/ a manual boost controller, but on the upside, I think the EBC helps to reduce the lag.
05-12-2005, 12:47 AM
#7
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Re: Rear mount turbo dyno results are in
What turbo are you running? It drops off HARD way too early IMO, seems like you need a different exhaust housing. Can we get a complete list of mods? I'm sure a turbo cam would help also.
Also how much psi did you see on the dyno and how much do you see on the streets?
Also how much psi did you see on the dyno and how much do you see on the streets?
05-12-2005, 03:47 AM
#10
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Location: Lafayette, CO
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Re: Rear mount turbo dyno results are in
Just an FYI, the boost controller is not at fault for the graph looking like that. The peak numbers seem fine (as they typically do on an STS vehicle), but IMO, there's something seriously wrong with the car falling flat on its face after it peaks. Especially being a turbo car.
05-12-2005, 05:06 AM
#11
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Location: Cleveland, WI
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Re: Rear mount turbo dyno results are in
Originally Posted by 97 RedSS
Yeah something aint right..On one of the runs your Hp/Trq readings never cross 
Cody
Cody
05-12-2005, 06:00 AM
#12
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Re: Rear mount turbo dyno results are in
The lines do cross @ 5250, it is hard to see on the smaller pic, but the two runs are blue (lower power, marked as 371.54 & 457.17) and red (higher power, marked as 468.93 & 576.89).
After some more research, I think part of the problem is the Supertrapp muffler restricting airflow at the higher RPMs. Fortunately, it can be uncapped for more flow. I will try this on my next dyno run, or I may add a cutout. I may need to go with a larger AR on the turbine as well, but the tradeoff here is more lag and later boost.
The GMPP Hot cam is not ideal for this setup, but it was purchased when I was going to go NA. I got the boost bug later and should have chosen a better cam for the application.
Here is the setup:
383, all forged rotating assembly, 9:1 pistons
GMPP Hot cam
52mm TB
1.6 Rockers
Mac mid-length headers & y-pipe
LTCC ignition
LT4 heads & intake
3" high flow cat
3" Hooker catback
Master Power 62-1 turbo (believe the AR is .68 on the turbine and .70 on the compressor)
Tial 38mm wastegate
Turbo XS blow off valve
Greddy Profec B spec 2 boost controller
3" outlet into 3" Supertrapp muffler (all plates installed)
Walbro 255 LPH high pressure in-tank pump
MSD pump booster
Racetronix pump harness
Fuel was not an issue, the Walbro unit worked fine. The tuner did not have to adjust the MSD pump booster, which was set on it's lowest setting. I think this is also attributable to the Racetronix harness, which is good stuff.
When I first ran the car before the Dyno tune, I saw 9 PSI in third gear, and lower amounts (6+/-) in second gear. This was also observed at the Dyno tune.
I'll update numbers after some more work on my end (literally, have to make changes as well as pay for the dyno time).
After some more research, I think part of the problem is the Supertrapp muffler restricting airflow at the higher RPMs. Fortunately, it can be uncapped for more flow. I will try this on my next dyno run, or I may add a cutout. I may need to go with a larger AR on the turbine as well, but the tradeoff here is more lag and later boost.
The GMPP Hot cam is not ideal for this setup, but it was purchased when I was going to go NA. I got the boost bug later and should have chosen a better cam for the application.
Here is the setup:
383, all forged rotating assembly, 9:1 pistons
GMPP Hot cam
52mm TB
1.6 Rockers
Mac mid-length headers & y-pipe
LTCC ignition
LT4 heads & intake
3" high flow cat
3" Hooker catback
Master Power 62-1 turbo (believe the AR is .68 on the turbine and .70 on the compressor)
Tial 38mm wastegate
Turbo XS blow off valve
Greddy Profec B spec 2 boost controller
3" outlet into 3" Supertrapp muffler (all plates installed)
Walbro 255 LPH high pressure in-tank pump
MSD pump booster
Racetronix pump harness
Fuel was not an issue, the Walbro unit worked fine. The tuner did not have to adjust the MSD pump booster, which was set on it's lowest setting. I think this is also attributable to the Racetronix harness, which is good stuff.
When I first ran the car before the Dyno tune, I saw 9 PSI in third gear, and lower amounts (6+/-) in second gear. This was also observed at the Dyno tune.
I'll update numbers after some more work on my end (literally, have to make changes as well as pay for the dyno time
).
Last edited by Live for TAs; 05-12-2005 at 06:03 AM.
05-12-2005, 06:16 AM
#13
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Location: Mission, Kansas
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Re: Rear mount turbo dyno results are in
Do you have the lt4 springs? If so I bet thats part of your problem.
Edit: If you are running the .68 ar then thats a lot of your problem also.
Edit: If you are running the .68 ar then thats a lot of your problem also.
Last edited by 1982z28with18s; 05-12-2005 at 06:21 AM.
05-12-2005, 08:38 AM
#14
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Location: Jackson, MI
Posts: 315
Re: Rear mount turbo dyno results are in
Just out of curriosity, what is the flow rate of the compressor at under 10psi? You may be getting outside of your efficieny range and really spinning that turbo. For a 383 I would think that you'd need a t-76 minimum.
I would also think that the turbine housing needs to be bigger as well. I don't think that the STS setup needs that small of a turbine housing to make up for the exhaust cooling.
I would also think that the turbine housing needs to be bigger as well. I don't think that the STS setup needs that small of a turbine housing to make up for the exhaust cooling.
