Hay guys I need a little help. I had a little bad luck the past 2 week. I rebuilt the motor in my 87 Turbo T. It had 140000 miles on the never been touched motor that I thought was blowing smoke. After putting the motor all back together and putting the turbo on in which the bearings felt good at that time. I started the car and let it run for its half an hour brake in period, during the brake in period the bearings in the turbo took a •••• on me. The next day I took the turbo all apart and found the exauste side seal is shot (which was causing the motor to blow the smoke), and all the bearings, o yea the best part is that the impeller ground into the housing. So its know time for a new turbo.
My question is what turbo do I buy. The things I have done to my car is stock bore, Comp Cams kit with a 212/212 cam 91 pound valve springs. It has stock heads that have been ported with all new stock size valves, the intake and stock headers are ported to match. 36lb. Injectors with a walbro 307 fuel pump with the hot wire kit, and a billet adjustable fuel pressure regulator. I’m looking at running 18 to 20 pounds of boots. The turbos im looking at is the TA49 or the PTE51. Please let me know what turbo would be good. Thank You for the info and help!!
Yikes! You wont be running very fast in 18 to 20 pound boots!
j/k
=D
In my experience, I bought a TE44 thinking it would be plenty..well..it wasn't. I wish i went to a bigger turbo. Unless you are going to add a bigger stall, i'd go with the biggest turbo you can. In your case, the PT51 wins over the 49. I'd get the 51 out of those two.
IMO, I would go with the 52/54 for the shaft size, or a 60 series for that matter, but those choices will require a 3000-3200 converter. Christmas is just around the corner. :-)
Regardless of which is chosen, injectors would be high on my shopping list with what you have. I had 009s going 100%+ DC with '49 @ 21-22psi & 24-26*. MSD 50s brought that down to ~80-85%. I'm now @ ~85-90% with a PTE52 @ ~22-23 and 23-25* through the stock fuel line (340 pump).
Dean
Hay Dean,
So what your saying is I have way to small injectors for what I have done to my motor?
It whould make sense because my car is fastest right know with the fuel psi. up to 49 on the fuel rail. Which I think means they would be at 100%. Correct me if im wrong.
Also do you know what all the differnt letters mean when it comes to talking about turbos. Like PTE or TE etc.? Thanks for the Help. I have alot to learn.
Kyle
IMO, yep, on the injectors. With the cam & ported heads, more cooler air is getting in, or can get in, which means more fuel can be consumed. Your 20psi with that engine is probably something like 24psi on a stock cam/head engine. I'm kinda guessin' here on the 24psi... anyone got data?? I'll know better when I get my ported heads on.
BTW, rail psi & injector duty cycle are not related, but ya, I'd say you were probably static. INJ DC is a calculation based on INJ PW time and RPM, that's it. If you have 20ms of INJ PW and have 20ms of time to do it in, then that is 100%. I'd be careful with that FP too. At 20psi of boost, you probably have ~80# pressure at the pump (unless you have replace the feed line with a free-flowing -6 or -8), which is the limit of the 307. You may have gone faster 'cuz it is leaner... try 45.
I have some of the turbo designations, but not all. AS I understand TA is stock appearing, TE is not, and PTE is proprietary to Precision Turbo. Many times when folks say PTE-xx to me, they are refering to having a PTE exhaust housing. I'm sure someone can add to this.
On the learning, read, read, read, read, read!! I have learned a lot, but still have a lot to learn. :-)
Oh, and I hope you have a data recorder. You car will need it. (That's a good thing.)
Dean