I was thinking 8.5:1 and racing gas since I'd be running around 15 psi boost. With the heat I'll be building up over 30 minutes on a road course I wouldn't trust 93 octane with that kind of setup. The experience I've had with turbos is I can make more power with less CR and more boost on the same octane. Does anyone disagree with this? As I see it, even NA I'm going to have a good amount of TQ on tap at any time, and as the boost comes up I'll just get traction limited on lower speed corners. Using 100 octane unleaded will also allow me to run more spark advance in the midrange to bring back some throttle response and then taper off the spark near TQ peak if it's detonation sensitive there. I like the flexibility that being able to vary boost and spark timing gives me. If I set the CR too high, I can't just turn a dial or hit a key to change it.

Rskrause, how do I find the pressure drop vs. airflow curves for the ATI twin intercoolers?

 

Well I'll tell ya I got the idea of doing a 600hp road race car a while back and its probably been close to 3 years now and I'm just now at the point of doing some tuning on the motor and looking to get it on the track for its first time this winter down in Texas or maybe in Indy before the season is over up here.

I still have a long way to go as far as the interior of the car goes, its pretty much stock for now save for a 6 point, seats and harnesses and some other odds and ends. This winter it will be revamped a bit with a full cage and the like.

As far as how to go about doing the motor and how it is going to react. I can't say to much about it other than what I have had experiance with so far, I can tell you that its going to be a dance to get the car around the track with that much power because I know how it is right now just cruising around town.

The only reason I shy'd away from the tubro's was the heat factor, with everything under the hood of a F body the added heat of the turbo is just going to bake everything under there if you are going to be doing 20-30 min stints in the car and with out doing some air management I don't know how it would be to cool everything under the hood, so I went with a ATI blower. Things are still warm but not terrible.

I will say this though, if you are looking at a ATI setup find the blower you want and get the head unit and do the rest of it yourself, if you want to hear a full detail story about it shoot me a PM or email.

Mine is still in progress and probably will not be 'done' for at least another year but I hopefully will get some track time with it so I know better where it is at and what still needs to be worked on as far as getting it all sorted out.

 

You guys are making it like extreemely difficult to hit 600rwhp...

I think I am close to that on pump gas, so it shouldn't be a problem and worse, I have an S-trim.. I think the T-trim is capable of far more power than the S-trim. I have a simple 383 afr 190 heads and 224/236 xe cam.. The last dyno time i did was 555 @8psi on a mustang dyno with the tires in smoke... I upped the boost to 10psi and I beat a 10.5@131mph rx7 turbo II without being much of a hassle and all on pump gas 93 octane Texaco.

I guess that with more octane and a T-trim it should be quite easy to hit the 600rwhp mark. I THINK!

 

Actually I think what I should have done...and something you might want to think about.....do you want to keep it an LT1?

One option would be to get some 18 degree heads or SB2 heads and convert them over to run on a LT1 block and do a sheetmetal intake and just forgo the FI all together, with the right parts there is no reason it shouldn't do 600hp NA. Hell at that point you could use any block you wanted if you didn't want to keep it a LT1 based motor.

The problem isn't going to be making the power I don't think. The issue is going to come with making that much power and keeping it all together for more than just a blast down the strip.

 

Exactly, which is the reason I'm not going to try to make that kind of HP normally aspirated. I'd rather make more cylinder pressure and keep the rpms lower than vice versa.

 

94bird,

How far did you get?

 

Yeah Mike!

You've decided haven't you? TELLLLLL UUUSSSSS!

283 SBC with an STS Turbo kit is my guess.

I want to reccomend also. 396 LT1 with a D-1 Setup. Custom plumbing to fit a huge single intercooler up front. Definately talk to those who've already done what you want. Looks like most blowers would work from the P-1 to the F-1.

http://www.procharger.com/models.shtml

Hope to see you out in the cones this year again.

 

I got exactly as far as having a son a few months before those previous posts. He's now 2 years old and is taking almost all my time. The Firebird has a car cover on it and I'm building a much milder 383 for it. No time for doing a real race season anymore so it'll just be a fun track day car until things change.

 

The challenge with the turbo is the header or exhaust manifold to the turbo. The challenge wih the supercharger is keep the belt on with lateral g's.
I would rather see the turbo action as it can be more flexible due to throttle input if the "lag" is minute.

Check this guy out for info...
http://www.bbsdesigns.net/

Jason

 

I think mine will actually be close to being done and running this summer....depending on the race schedule this summer. How longs it been.....2 years now?

 

A PT66 or PT67 would spool almost instantly on a 350 in a road race setup. Also in road racing your rpms stay high, so boost/lag at those rpms is non-exsistent. For road racing I personally would go with a long rod 355. Lots of rpms...

 

its funny to see you guys pick up just where you left off two years later lol.

 

Get yourself a ls1 aluminum motor, slap on some 6.0 heads to drop the compression 1 point - add a Incon twin turbo kit if you can find one, its got water cooled ball bearing turbos, water cooled is what all the TT road race cars use. Also has cast iron manifolds, they dissipate heat very well and don’t crack under the riggers of 30 min of full power driving. The aluminum motor will off set the weight of the kit (100lbs) Mine does almost 600rw with only 8 1/2 # of boost on a 347ci motor. If my wallet can ever recuperate from the turbo build, Ill get some tires and meet you all at the track.
Fwiw - I think turbos could work as good as n/a at the track because I can feel the way the car comes out of a hard turn , the power comes on smooth and plants the *** end of the car, massive torque takes over and your gone.
-0- and I think you’ll need about 15g’s minimum (to be reliable) in the heads, cam, turbo kit (6g’s), clutch, big fuel system, and good dyno tune. More if you don’t do your own install.

 

Well when your working for a race team...it doesn't leave to much time for your own hobby car at times...so it isn't hard to just pick it back up