Quote:

---

8lbs. I'm figuring it should be safe on 93 without an intercooler. I have 16lb wastegates if I want to try race gas. I plan to be able to run high 11's. Hopefully I won't need the 16lbs to achieve it with the car weighing 3000lbs

---

IMO you're treading on thin ice here with no I.C, iron heads, no meth injection, a blow through carb and no timing retard. 93 octane is extemely risky with all those factors.

I'd stick the timing at 10-15 and tune up from there. Keep in mind 'rich' isn't good enough, you'll want 11.5:1 OR LESS if you want to run pump gas.

Edit: just a quick engineering calc for you.
Assuming:
80 degree turbo inlet temps
8 psi boost
No intercooler
No meth/water injection
76% compressor efficiency (probably isn't if ebay turbos)
Constant specific heats for faster calc

You're looking at 174 degree intake temps, and that's not including heat transfer from various sources (usually good amount from turbo itself).

Quote:

---

But I have a 383, with open chamber big valve heads, stock pistons with 7.55:1 comp, stock sized hydraulic cam, modified Holley 600DP, and 2.56gear. I might be dreaming with the 11second hopes

---

Quote:

---

Quote:

---

8lbs. I'm figuring it should be safe on 93 without an intercooler. I have 16lb wastegates if I want to try race gas. I plan to be able to run high 11's. Hopefully I won't need the 16lbs to achieve it with the car weighing 3000lbs

---

IMO you're treading on thin ice here with no I.C, iron heads, no meth injection, a blow through carb and no timing retard. 93 octane is extemely risky with all those factors.

I'd stick the timing at 10-15 and tune up from there. Keep in mind 'rich' isn't good enough, you'll want 11.5:1 OR LESS if you want to run pump gas.

Edit: just a quick engineering calc for you.
Assuming:
80 degree turbo inlet temps
8 psi boost
No intercooler
No meth/water injection
76% compressor efficiency (probably isn't if ebay turbos)
Constant specific heats for faster calc

You're looking at 174 degree intake temps, and that's not including heat transfer from various sources (usually good amount from turbo itself).

---

Quote:

---

Quote:

---

Quote:

---

8lbs. I'm figuring it should be safe on 93 without an intercooler. I have 16lb wastegates if I want to try race gas. I plan to be able to run high 11's. Hopefully I won't need the 16lbs to achieve it with the car weighing 3000lbs

---

IMO you're treading on thin ice here with no I.C, iron heads, no meth injection, a blow through carb and no timing retard. 93 octane is extemely risky with all those factors.

I'd stick the timing at 10-15 and tune up from there. Keep in mind 'rich' isn't good enough, you'll want 11.5:1 OR LESS if you want to run pump gas.

Edit: just a quick engineering calc for you.
Assuming:
80 degree turbo inlet temps
8 psi boost
No intercooler
No meth/water injection
76% compressor efficiency (probably isn't if ebay turbos)
Constant specific heats for faster calc

You're looking at 174 degree intake temps, and that's not including heat transfer from various sources (usually good amount from turbo itself).

---

does a turbo produce that much more intake temp than a roots blower? I guess I should look into water injection

---

Quote:

---

I am switching down to 25deg. That worked well with the blower motor. and is more than 1deg per lb boost

---