Unless you've been living under a rock somewhere, Lightning owners know that heat is not your friend. Probably why everyone down here in Texas that wants to try us out usually waits until July or August to throw down a challenge. Thought I would share Go_rila's latest dyno run that graphically (no pun intended) shows the effects of heat on power output. The three recorded runs were done back to back to back with an aborted run between runs one and two. Look at the total elapsed time at the top of the graph (date and time functions are obviously screwed up) and the dramatic drop-off in horsepower.

Note to self: when bracket racing, try to maintain consistant truck temperature.

 

To second Sixpipe's opinion, Here's my dyno graph too...

Same circumstances, The bigger the pulley, the more heat generated, the more horsies lost...

 

Go_rila's got electric fans on the intercooler and radiator, right?
Does the radiator fan cool the engine better (is it possible to tell?) and do the intercooler fans help if the vehicle's moving?

I know the electric radiator fan helps reduce engine load, but I wanted to know how it compared to the stock fan.

 

So is the horspower generated with the 3# pulley still more than stock, at same temps ? What do you think ?

 

The best investment to consistantcy is the INTERCOOLER PUMP SWITCH. It will stablilze you intercooler flood temp even without the fans. It will stabilze it where it is the same for each run. You can run the pump all night long and not kill your battery. Fans without the pump switch is just spinning your tires.
noelvm

 

With regards to electric fans (my observations only):

Electric radiator fans reduce load on the motor and there is no doubt that Go_rila's dual 13" SPALs are more efficient than the stock fan set up for cooling. The intercooler fans help some because as the engine is running, the stock intercooler pump is circulating coolant through the intercooler, so I would say intercooler fans help, but minimally. Keep in mind that conditions were 81 degrees F.

Consider that the initial run was at ambient temperature or 81degrees F. The second run had to be somewhat higher because there was no time to disipate heat from the first run. With 81 degree cooling air, there is a larger Delta T the shorter the time between runs. This will be compounded by additional runs. More horsies, more heat, more work for the fans to do, less time to do it, more heat build up, less horsepower.

I made several changes since the dyno at FasTech last spring (382+ rwhp). I dont know how much of the 23+ horsepower gain can be attributed to the lower pulley, but I would suspect that most of the torque increase comes from that modification.

Like I said, just my observations.

 

guys need your help. I leave in a hot area like you guys. I am from the Philippines. I had the lightning dyno and my max power was 315 hp only torque was only 385 i have put in the all my stuff from JDM like warm weather program chip, 90mm airmass kit, breather,fuel rail and rail regulator and ngk plugs so i think some thing is wrong some where. i have cleaned very will the connector of the cpu box and still the same i need your help with this as you guys will be the closes to my weather thanks so much for any help and info you can give

 

The Unstated factor in these Dyno runs ( I was there ) was the 20 year old kid doing the pulls. He did Go_Rila's 4 pulls in under 2 minutes... He was not interested in technique or HP or torque readings he was PURELY in it for volume. "How many $20 dyno pulls could I put in my pocket by noon..." NO COOLONG TIME BETWEEN RUNS.

I asked if I could try driving my truck on the dyno since the Lightning CLEARLY has a torque peak lower than 3600 RPM's. The kid wound the engine up thru the gears at about 4000 rpms... Once in Third he let up onthe gas for a second then floored it.... Not exactly good technique.

PS My HP and TOrque were pretty much unchanged even though I had a new burn on chip, 2# lower pulley and Throttle body...

Doug

 

Silver -

I had a chip reburn; 2lb pulley and billet T/B and netted an additional 17+ rwhp. My A/F is a little off and there is another 4-7 rwhp when I get that corrected.

There is an art and science to getting consistent dyno pulls that can be used for comparisons purposes.

 

This may have been discussed before but has anybody found a electric water pump for our trucks at all that would work. For the motor coolant. I think running that in the staging lanes would help out allot alos to cool the motor down with electric fans.