| Author | Message | ||
| Tommy Anastasiou (Tommya)
Junior Member Username: Tommya Post Number: 82 Registered: 10-2002 |
Mark, Ben, both of you guys have given me good advise previously. I respect and thank both of you. I guess when I posted the equation it should have been something like that. P6 vrs turbo=Bhp+$$$/advantage=fun=blown??? Is that better and agreed !! Any objection ??  | ||
| Mark Eberhardt (Me_k)
Member Username: Me_k Post Number: 474 Registered: 5-2002 |
Tom, A wastegate kicks the boost out not in. The adjustment sets the maximum boost. I'm not saying you won't get any boost below 4000, you will. There are a couple guys with turbo car and they'd know best, but I would guess you'd see about 1 psi at 3000, 4 at 3500, 15 at 4000 and up if that's where the wastegate is set. The problem is there just isn't enough energy in the exhaust to spin the turbo down low. Personally I'm very biased toward supercharging for cars that are primarily used on the street and it won't let you down on the track. They just drive better, with no mid-corner surprises as the turbo spools up and doubles the HP | ||
| William H (Countachxx)
Intermediate Member Username: Countachxx Post Number: 2224 Registered: 2-2001 |
problem with turbos is heat. Are you talking about cams for your TR or a 308 ? My 308QV used torun very hot 7 that was just stock, i'd hate to add a turbo to that, on the TR you have a lot more room & its easier to upgrade radiators, oil coolers etc. | ||
| Ben Millermon (Brainsboy)
Junior Member Username: Brainsboy Post Number: 228 Registered: 5-2001 |
Why not supercharge? A supercharger is much easier to install. You dont have to mess with exhaust pipes, the stock cams work perfect with superchargers. A supercharger has more flexability, you can change the pulleys for different drive ratio's. I'd rather be blown then injected, or turbo'd any day. | ||
| Tommy Anastasiou (Tommya)
Junior Member Username: Tommya Post Number: 81 Registered: 10-2002 |
Mark, What if an adjustable waste gate is installed to kick the Turbo sooner than 4000rpm. What I'm looking for is a strong all around vehicle but If the need arises to take it to the track it would not let me down. I'm leaning more towards the turbo for the simple reason that no other mods have to be done to the engine. Your thoughts? | ||
| Mark Eberhardt (Me_k)
Member Username: Me_k Post Number: 473 Registered: 5-2002 |
I guess I nice 2v engine with cams, pistons, porting, exhaust should make around 325-350 HP at or above 8000 rpm. I would guess you'll put 10k into it and have a really nice engine. If you try to do just cams, the lower rpm will suffer because the compression is too low and the high rpm will suffer because the flow is too low, not so nice. A simple non-intercooled turbo engine that makes 350-400 HP, no internal engine work, will probably cost around 6-8k. I think the 325-350 HP point is about where forced induction becomes the more attractive option. If you spend the same money, say about 10k, you can add an intercooler to your turbo and get into the 450 range, any more and you'll need to get inside the engine and beef it up. So you're comparing 325 to 450 peak numbers. But that doesn't tell the whole story. The turbo engine will make it's power above 4000 or so, below that it will be exactly the way it is now. The naturally aspirated engine, if done right, will make it's power from idle all the way up, pretty nice. A supercharger (roots or screw type) will give the best of both worlds matching the turbos peak number and delivering the gain across the full rpm range for about the same money, but uses a little more fuel under boost than a turbo. There just is no right answer, it depends a lot on how you are going to use it. Turbo are untouchable at the track, but superchargers accelerate much better and are more drivable, naturally aspirated for class rules or just because 8500 rpm with a free flowing intake and exhaust sounds so good. | ||
| Russ Turner (Snj5)
Junior Member Username: Snj5 Post Number: 77 Registered: 2-2003 |
SMFI - Woo Hoo. Single or individual throttle bodies? Then forced induction or cams will work well. Sounds wild - good luck! | ||
| Tommy Anastasiou (Tommya)
Junior Member Username: Tommya Post Number: 80 Registered: 10-2002 |
Russ, Thank for the responce. Just as an FYI SMFI is on the works. | ||
| Russ Turner (Snj5)
Junior Member Username: Snj5 Post Number: 76 Registered: 2-2003 |
P-6 or radical cams will not work in an K-jet injected car due to airmass pulsing screwing up the airflow sensor plate. To use more radical cams must go to carbs or EFI. Turbos work well on K-jet injected cars (Witness original turbo carrera). best rt | ||
| Tommy Anastasiou (Tommya)
Junior Member Username: Tommya Post Number: 79 Registered: 10-2002 |
Since we are fresh on the P6 subject, if you have an X amount of money to spend on the motor and the choices were P6 or single turbo which will be the best way to go? If turbo is the winner what's involved as far as engine mods?? Please remember that I'm comparing the 2 on performance and $$$. Thanks in advance. |