26ZX Donzi

Too much boost with an intercooler bringing input temps at plenum down to 100*? If I take it easy will it last?
Thanks, Tim

cobra marty

What have you done to the fuel system? If this is not addressed it will detonate and blow. If the fuel has been richened and there is no Detonation, it will live. Detonation is the killer, not boost or intake temp.

26ZX Donzi

Nothing done yet, even as far as the supercharger. I'm planning on a possible purchase from Livorsi Marine. It includes reprogram of ECU by Energized Fuel Injection as well as a modification to the fuel delivery system.

tomcat

Hey Marty - What causes detonation?

26ZX Donzi - Can you send me a picture of Livorsi's setup? How much HP is claimed for this setup. I'm guessing 600-650 HP. At 6.5 psi the pressure ratio of 1.442, so the temperature after compressor will be at least 154 F, assuming 74% compressor efficiency. An intake temp of 100 F implies that the intercooler is only 68% efficient if water is 75 F.

26ZX Donzi

Hey Tomcat,
Was hoping to hear from you, but I did not want to bother you until I had all the facts. (still don't) What I do have is this:
On a 500HP it puts out 696 hp and 703 ft lb trq. I was told to subtract about 70 +/- for 502. Tested in 80* water temp; out of Vortech 180*, temp after intercooler 100*. Efficiency I believe was in the 80 some percent range according to shop. Loss of psi across cooler reported at .2psi. Intercoolder manufactured by big-name company, but not given a name ( I believe he wants to get this going first). ECU to be reprogrammed by Energized Fuel Injection out of Oshkosh, WI (co. has a good rep here on board). Anything else I should ask?
Tim

Pure Energy

Have the install done by a pro. who knows how to set up fuel system. The motor should be ok if you take it easy. Meaning short wide open runs, and moderate cruising speed. Change head gaskets and use studs. You may need to change exhaust if you have'nt already.

cobra marty

The Livorsi Coolcharger setup is not intercooled nor uses a Vortec S/C. It is a twin Powerdyne S/C non-intercooled low boost kit.

26ZX Donzi

Marty,
Mike Livorsi is coming out with a new set-up that uses a Vortech system. The "cool charger" system is no longer in production. He will have this new system advertised shortly. I live only a couple miles from their shop. I am seriously considering putting the new system on my motor. I feel the need for more speed! (plus I can't keep up with any of you guys - yet!)
Tim

cobra marty

Vortec has an intercooled system out. It has 3 versions and 3 HP levels. Is this what they are doing?

tomcat

Energized Fuel Injection is a good comapny according to a longtime racer and rigger I know. Company owned by ex-Merc employee (engineer?).

I would ask what boost level was used on the HP500, and where was it measured, at the compressor discharge or in the intake manifold? Assuming that air temp was also 80F, the compressor discharge temp of 180F is fairly high, suggesting high boost was used. I have data from a Vortech test on an HP500 that shows 150F compressor discharge temp at 5.9 psi compressor discharge pressure. 180F suggests over 8 psi discharge pressure and about 37, 000 RPM on a V-7 YS trim compressor. Why should you care about this? High system resistance can be overcome with higher compressor discharge pressure, but heat is the result. The intercooler is doing a good job though, so it must be fairly big.

The pressure drop across the intercooler is due to it's resistance to airflow, but it also reduces the pressure downstream due to the effects of cooling. I think that the effect on overall system resistance of these two factors usually just about cancel one another out, often with a slight reduction in overall system resistance which allows the compressor to push a little more air through the system at a lower discharge pressure. But the main benefit is temperature reduction. I believe that intake temp is important for preventing detonation so 100F is a lot better than 180F.