urbamworm

That is about what I did when I attempted going to the track once. Street tires suck big time, think my best 60ft was 2.0 with the rest at 2.1 or 2.2. I was pretty disappointed to say the least. What mods do you have?

urbamworm

How did your air/fuel look? Did it stay pretty steady or did it drop like mine did? That is crazy that you got those kind of numbers while getting that kind of intake temp. That throws a wrench in to things

GT-ER

Wow...that's pretty freaking high. Those were the kind of temps I was seeing when my pump was bad. Now, even on my 180mm pulley, I have yet to see over 160*.

GOOD LUCK. Although, maybe with drag radials you would likely smoke me...my car feels like it's on soap on the 1/4 mile.

skratch77

a 185mm pulley is making the blower get about 40-50 degress higher temps over a 178.

Here is something I found on here about our blower.



Compressor map

--------------------------------------------------------------------------------

I found this last night----thought people might really find it useful. Its the compressor map to the Lysholm 2300R supercharger(very similar to our SC).
There's a lot of info there!!! Its a pdf--maybe someone could post it as a pic.

I find the data facinating. At 8-9psi or 1.6 pressure ratio(what most stock cars see at redline) the Supercharger is at its peak efficiency island of 65%. This means that on a 77*F day-- SC discharge temps are 185*F.

Once you put on a Larger pulley (168mm) and boost goes up to 12psi or 1.9 pressure ratio. You see that SC efficiency goes down to 63% and outlet temps rise 40*F to 225*F!!!!

The Huge pulleys (178mm+) that increase boost to 14-16psi or 2-2.2 pressure ratio. These drop SC effeciancy WAAAAAAAAAAAAAY down to 56%!! So the SC is compressing more air at a lower efficiency. Discharge temps are now 105*F above stock at 290*F!!!!!!!!!!!!!!!

---no wonder we need increased cooling.

Even though we are only incresing HP by 25% or so.....we are asking our intercoolers, which were designed to work decently at 185*F, to remove 80% more heat

I ran my best time with a 175mm pulley and going to a 178 I lost about 1-2mph in trap speed.I think Im going to install a 80mm tb and try a 172mm pulley next.I also tried my stock pulley with all my mods and I was trapping 118-120mph and the car was VERY consistent on the street and track.

A 185mm pulley is so high in heat output that its not even on the compressor map.

GT-ER

Install cams and polish the heads and you'll lower the pressure ratio of the s/c and lower intake temps as well. This is one reason why I chose to remove EVERYTHING in my exhaust except for the muffers. Keeps exhaust pressure low and will make the heads/cams the next weakest link flow wise.

jmb614

The CM-30 is working, I turned the key to position 1 and heard it whirring away. I will likely separate the IC loop, log and go from there. Afterwards I will likely replace the CM-30 with a Mezeire, then add a trunk tank and/or meth injection.

jmb614

185 ASP, TTM fuel kit, EC H/E, CM-30 wired always on. Exhaust and further cooling upgrades are on my short list.

jmb614

Do you have your IC coolant circuit split?

skratch77

You can try running the pump like a stock car.I think the 185 is making so much heat and having the pump run all the time that you never get a chance for the coolant to sit in the heat exchanger to cool down.

jmb614

I was actually thinking the opposite; that the CM-30 isn't flowing enough coolant through the H/E? I know of others that have similar mods as I but are running Mezeire pumps and do not have nearly the IAT's that I do.

Forrest Gump 9

My car with 180 pulley, long tube headers, and 82mm tb on third gear pull I only see 12 psi.

skratch77

You lost boost from the longtubes,your blower is def making 15+psi though.

KLR CLS

Ya, it was dumping fuel hard. We hard to keep pulling fuel. left it at 10.4 to be safe. With those temps and 10.4 I made 530whp 600 tq, so felt it was good enough.

urbamworm

I talked to a tuner about the pump thinking the same thing as Skratch (flowing to fast not giving enough time to cool in the H/E), but he said the opposite like you are thinking. He tunes all over the world on all sorts of cars and even works with race teams. He said they use the Mezeire pump on air to water intercooler systems and got me thinking I should change out the cm 30 for a higher flowing pump like the Mezeire.

jmb614

I just picked up a Meziere, getting ready to install it this weekend. I'll try and post some numbers afterwards.

GT-ER

No, his supercharger is making 12psi. The compressor map only cares about boost made within the intake manifold.

I don't get how he can see only 12psi though. My car may not have long tubes, but it has kleeman headers and absolutely nothing else until it gets to the Xpipe and then the mufflers. I see 15psi with my 180.

skratch77

No the supercharger is a fixed mechanical twin turning at Xrpm,the blower is def making that boost but its getting blown out the engine faster from the higher volume effieciency from the exh work.

If you open up the engine too much and say you run a really agressive cam the boost will get even lower from boost blow by from shooting out the exh valve before it closes.

take a straw and blow air threw it with a constant flow and then slowly start closing one end of the straw up,now if you put a psi gage on it and keep blowing air out the same volume you will see the psi go up in the straw once you start blocking it and the psi will go down once you open up the flow.

A kompressor map is just that,they dont give you the info for the blower on xxx car,they give you the specs of a xxx air temp and what it does at ever rpm point

GT-ER

You are confusing airflow with boost. The supercharger will move X amount of air at any given rpm...that won't change...but BOOST is the pressure that is created when the engine cannot consume the air the supercharger is feeding it...and that WILL change. When you add headers the boost will go down, but the airflow will remain the same ( making it more efficient ). They are not one in the same. When he says he is making 12psi...he is making 12psi...all the while I am making 15psi. The airflow that the SC is moving however is the same.

skratch77

If you read I said he is making 12psi from his headers,my point was the blower is turning just as fast.

GT-ER

You are correct in the above statement, but you said his blower was making 15+psi even though he was making 12psi...which is incorrect.

Regardless...even airflow gets affected at some point due to backflow ( which I'm sure some of the larger pullied guys have ) but the argument is going to get complicated so I'll leave it at that...lol.