TTP 427ci LSx, TTiX Twin Turbo C5 - Prelim Results
02-09-2008, 04:33 PM
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TTP 427ci LSx, TTiX Twin Turbo C5 - Prelim Results TTP Built 427ci Low-Compression Motor
- GMPP LSx Block
- JE -29cc Dish Forged Pistons
- Oliver C/Rods 6.125"
- Callies Magnum 4.000" Stroke Crank
- King Rod/Main Bearings
- GM Cam Bearings
- TTiX Twin Turbo (T3/T4) Kit
- TTP Stage 2 Differential
- TTP Stage 3 T-56
- TTP Custom Fuel System
We sent the turbos back to George, he opened up the wastegate bore holes a bit, it did help control the boost a bit better but we are still in the 18psi range, so we slapped some Sunoco Standard/Purple in there and started on a Speed Density tune. We are stepping up to a different turbo setup (The turbos were going to run out of steam up top) provided by George @ TTiX and redoing the 2.5" catted exhaust to a straight 3". I just wanted Jerry to drive his car & he will be bringing it back in a few weeks, so we released it to him with a safe rev limiter of 4800RPM so he can get used to the car, lol.. Here's the graph:
The above graph is UNCORRECTED. The SAE numbers were 722/786.
- GMPP LSx Block
- JE -29cc Dish Forged Pistons
- Oliver C/Rods 6.125"
- Callies Magnum 4.000" Stroke Crank
- King Rod/Main Bearings
- GM Cam Bearings
- TTiX Twin Turbo (T3/T4) Kit
- TTP Stage 2 Differential
- TTP Stage 3 T-56
- TTP Custom Fuel System
We sent the turbos back to George, he opened up the wastegate bore holes a bit, it did help control the boost a bit better but we are still in the 18psi range, so we slapped some Sunoco Standard/Purple in there and started on a Speed Density tune. We are stepping up to a different turbo setup (The turbos were going to run out of steam up top) provided by George @ TTiX and redoing the 2.5" catted exhaust to a straight 3". I just wanted Jerry to drive his car & he will be bringing it back in a few weeks, so we released it to him with a safe rev limiter of 4800RPM so he can get used to the car, lol.. Here's the graph:
The above graph is UNCORRECTED. The SAE numbers were 722/786.
02-09-2008, 06:19 PM
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The customer provided the TTiX kit, it was originally on another shop's poorly built 370ci motor that had spun a bearing pretty quick, clearances were absurd. He then decided he wanted something bulletproof, so we turned to JE, Callies & GMPP on this one. I am building an exact duplicate of this motor for a WS.6 rearmount 76mm turbo car that had a similar problem with a 408ci motor.
02-09-2008, 09:17 PM
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I agree. I understand the customer provided the turbo kit but those turbo's get maxed out easily on 4 cyl. vehicles. Judging by the fact that they are mounted to the manifolds I'm sure he would have fitment issues with larger snails. Were you guys having issues with boost spike?? I am guessing because you mentioned enlarging wastegate bores.
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02-09-2008, 09:43 PM
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Where is the full pull showing the turbos maxing out? Those very turbos have seen over 1000rwhp on other cars and easily make 850rwhp w/out breaking a sweat. They essentially flow what Hunters 60-1's flow and he is making over 1000rwhp. Convince me by providing a dynosheet showing a full run and showing the turbos falling off.
02-09-2008, 10:03 PM
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Where is the full pull showing the turbos maxing out? Those very turbos have seen over 1000rwhp on other cars and easily make 850rwhp w/out breaking a sweat. They essentially flow what Hunters 60-1's flow and he is making over 1000rwhp. Convince me by providing a dynosheet showing a full run and showing the turbos falling off.
Don't mean to
02-09-2008, 11:14 PM
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For one thing I never stated that they have been maxed out yet. The customer preferred for us to do it this way, he doesn't want the severe ramping of the uncontrollable boost like we are having here. We did not find the max of the turbo and yes there really isn't much to do under there, I believe that George is reusing the t3/t4 style with a bigger turbine machined down. I do not exactly know my information is second hand through my customer. He is trying to do everything to make the boost more controllable because right now it's just too much air for these small turbines/housings.
VINCE: Remember I'm dealing with a 427ci huffing a lot of air here. I am not familiar with Hunter's combo I see that it is a 377ci. This 4.125" bore has a little bit of room to pack some air in and wants to push it out
VINCE: Remember I'm dealing with a 427ci huffing a lot of air here. I am not familiar with Hunter's combo I see that it is a 377ci. This 4.125" bore has a little bit of room to pack some air in and wants to push it out
02-10-2008, 03:12 AM
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There is obviously more in it considering the pull stopped well before redline...Holy cow 722/786 @ 4800RPM 
and still climbing, HP/TQ will cross north of 800.
and still climbing, HP/TQ will cross north of 800. Last edited by ExceSSive; 02-10-2008 at 03:40 AM.
02-10-2008, 05:50 PM
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VINCE: Looking back on the whole ordeal, and how much labor it is to service this setup (And also considering when we sent them back the first time I wanted to change the exhaust housings but we were guaranteed by just boring out the w/gate hole it would be fine) I would have much preferred to make a custom one-off kit like we are doing in about 2 weeks for another C5 customer
And no, I will never have a production turbo kit, but I'd be happy to fabricate anyone in house.
And no, I will never have a production turbo kit, but I'd be happy to fabricate anyone in house.
02-10-2008, 11:13 PM
#16
I tuned a TTi X kit on a 377" motor and also on a stock inch motor. The owner ported his own housings and gates. On the 377" we couldn't keep it under 14psi with I believe a 7lb spring, no boost controller. It was around 12 psi min on the setup that was stock cubes. In any case, on these smaller setups the porting worked.
These turbos would be out of effeciency QUICKLY on an engine that large (as stated). To be honest, it seems like a rev in neutral would send the ball bearing units into boost on the stock inch engine! Imagine the difference in load and cubes... and nasty backpressure too. That torque rush ought to be nuts on the car.
These turbos would be out of effeciency QUICKLY on an engine that large (as stated). To be honest, it seems like a rev in neutral would send the ball bearing units into boost on the stock inch engine! Imagine the difference in load and cubes... and nasty backpressure too. That torque rush ought to be nuts on the car.
