You probably can't go wrong with any turbo below a T66..... i.e. SP57/60/63, T61/64, PHR Stage2, etc....Bill P said:Is anyone using the SP63 for road racing? I want the most usable power I can get using 91 octane on the track. I know the sp57 and 60 would work out fine, but am wondering if I can do more with a larger turbo.
Bill P 95bpu++
I've raced a friend's SP60 a few times in my TTC BPU. When we raced from low RPMs I would spool sooner and get the jump. I believe his turbo should make 500rwhp at 18 psi, but its not tuned now (although hes on stock fuel). I don't know how much that effects spool, but it definitely spools later than TTC the way he has it now.kflee said:My only reference to this point is BPU in true twin mode. This is slightly more lag than I would like for both street and road racing.
Whoa, hold on there. I'd take my experience with a grain of salt, as Jon's car isn't running all too well. Jon I think you should stop trying to tune it yourself If you come up here I can do it with the wideband, or get Lance to do it.kflee said:Thanks for the input Grant. Sounds like the SP57 may be the way for me. Of course, I will still have to drive Steve's. If I think I can live with the lag he has, that will definately be the way I go.
If it's hot outside, I'm at 16psi with timing retard and am probably making 370rwhp at the track....Bill P said:Thanks for the posts guys. I guess the big issue I am trying to work out is weather it is worth the extra $3.5k for up graded fuel and electronics to produce 525 rwhp at the track with the SP63 etc. vs 480 rwhp with the SP57, 60 setup. I suppose there is something to be said about "area under the curve" and shear torque numbers also though.
Andi, with your high output bpu car, at about what hp do you drive with at the tract? And could you compare it to driving Pete's PHR single car? Or maybe you've already answered this by saying you want the T64 or PHR stage 2 for yourself
Justin,Justin-N said:I have a T78 and frequent the longer road courses with no problem. It works very well at TWS(I was turning 2:05s and 2:06s in traffic on 245/275 street tires at the 2.9 mile course) on low boost(1.1 bar) Short tracks like the blimp base(GSS) in Houston may prove to be a bit slow, but anything longer than Hallett should be fine.
I think I met you at TX2K1, although I was only BPU at the time. I have a white 95 Hardtop turbo 6 speed with Blitz Z1s. Although, at TX2K1 I had Racing Hart C5s.
I go to TWS about once every 2 months or so with the LSRPCA(Porsche club) and I went to the last John Eagle event at TWS. I like running with the Porsche guys because they seem to be pretty cautious. I just do this for fun, not for competition.
True, the esses are the only slow part for me, although I'm almost at full boost as I hit turn 15, I hit 4th right at the pavement change to go onto the front straight. Then, believe it or not, I try to take it easy on the front straight. I usually just coast after the start/finish line to take it kinda easy on the brakes. I've had to go into 6th a few times when I'm really pushing it, but that is REALLY hard on the car. The chicane is also a little slow as I exit, only because I usually leave it in 3rd, but I still have enough power to induce lift throttle oversteer as I hit that left hander(turn 11).
I'll be out there on December 1st and 2nd, again on street tires, but I really need to start thinking about some slicks to stick on the stock 17s. That should make it a little more interesting for me in the corners and still loads of fun on the straights. I was having some power steering issues last time I was out, so I was forced to run lower boost than I really wanted to. They had also black flagged me for spitting flames(and lots of them) as I wanted to run extremely safe. My power steering is still intermittent and I have a Blitz FMIC now(I was running on stock previously) so we'll have to see how it'll go this time.
Question for you.... Have you run into any power steering problems?