DieselWrencher
6cyl Vette
- Joined
- Dec 4, 2006
- Messages
- 2,886
I went to twins on the corvette this year and am having a little issue and want your guys' opinion on if this sounds right. I have a 64/65/14 S300 on top and a 76mm HT3B on the bottom. I'll start out back in April at Ennis, Tx. We made 3 runs there, which the 2nd one we had some problems. When the car came back to the pits I popped the hood and the air shut off was shut and the cold pipe blew a boot at the inlet of the secondary. Put it back together and ran it one more time.
We get back to Iowa and fix the transmission issues we had in Tx. My brother took the car on the street and test drove it. He was seeing 30-35psi at the primary and 70-75psi after the secondary. he brought it back and I let my friend drive it. He was gone for a while and when he came back he did a huge burn out in front of the house. He got side ways and let out of it but then got right back on it and it went pop! To tell a long story short, the turbine wheel exited the housing. The shaft was bent and the compressor side is perfect. The bearings are perfect, I checked oil supply and it is right on, checked oil return and it is fine.
We purchase another HT3B, put it on and ran it last saturday. The car went 11.55 at 117mph but blew the primary just after the 1/8th mile. Today I called BW and the tech there thinks we are over speeding the turbo. That was the only thing I could think of too seeing how both turbos bent their shafts and tossed the wheels out of the housings.
Here is the pictures of the first junk HT3B. I will get pics of the 2nd in a bit. Feel free to give input. i am leaning on going to a S475 or S480 now. I originally was going to go with a S475 but in March they were on back order and I had to have the car running for Ennis, so I opted to use the HT3B. I guess that was a dumb idea on my part.
We get back to Iowa and fix the transmission issues we had in Tx. My brother took the car on the street and test drove it. He was seeing 30-35psi at the primary and 70-75psi after the secondary. he brought it back and I let my friend drive it. He was gone for a while and when he came back he did a huge burn out in front of the house. He got side ways and let out of it but then got right back on it and it went pop! To tell a long story short, the turbine wheel exited the housing. The shaft was bent and the compressor side is perfect. The bearings are perfect, I checked oil supply and it is right on, checked oil return and it is fine.
We purchase another HT3B, put it on and ran it last saturday. The car went 11.55 at 117mph but blew the primary just after the 1/8th mile. Today I called BW and the tech there thinks we are over speeding the turbo. That was the only thing I could think of too seeing how both turbos bent their shafts and tossed the wheels out of the housings.
Here is the pictures of the first junk HT3B. I will get pics of the 2nd in a bit. Feel free to give input. i am leaning on going to a S475 or S480 now. I originally was going to go with a S475 but in March they were on back order and I had to have the car running for Ennis, so I opted to use the HT3B. I guess that was a dumb idea on my part.
