Guess my horsepower

[phil_jordan]

500 hp on 93!!! You have one of the coolest buicks. Good stuff

 

[toomanymodz]

500 hp on 93!!! You have one of the coolest buicks. Good stuff

Thanks! I had it running great on straight 93. So far, the race chip isn't seeing it's potential yet since i'm able to get only 1 or 2 more pounds of boost and a few degrees of timing. I feel like i'm wasting the 110 octane gas. Today i'm going to try to 'stretch' the spring in the RJC boost controller and see if I can get the boost up to about 24 or 25 psi. It'd be great if they equipped it with a different spring. I've heard many folks talk about not getting much above 22psi with it without modifying it.

 

[toomanymodz]

UPDATE: ok, i installed a stronger spring in the RJC boost controller and the boost is now 24-25 psi. I logged another pull and had my big brother in the car with me. Total weight this time was: 3750 lbs. For this pull I started at 50 and up due to spinning at anything slower than that. 50 to 125 MPH takes 8 seconds flat. The injector duty cycle is 74% at 5500 RPM and the AFR is 11.2 to 1. I wish I could have gotten this kind of boost on the dyno, I think 550 RWHP would have been the magic number.

 

[Phoneguy]

Mine did 555 hp at 21psi on pump and alky at 9.8:1 af . ..I think you would be much higher than that.

Sent from my SPH-L720 using TurboBuick Mobile mobile app

 

[toomanymodz]

Mine did 555 hp at 21psi on pump and alky at 9.8:1 af . ..I think you would be much higher than that.

Sent from my SPH-L720 using TurboBuick Mobile mobile app

I'm curious, what RPM's were your peak HP and Tq ? My torque peaked at 4800, and the HP pretty much was flat between 4800 and 5200, then fell off after that. By 5500 it was done.

 

[Phoneguy]

Pretty sure it was just short of 5200
I will have to find the log
Bryan

 

[toomanymodz]

I went to Bradenton a few days ago. Night racing, and the track wasn't prepped, so I knew my 60 foot times were gonna be pathetic. I ran an 11.2 at 125 MPH. One thing I noticed was a random 'missing' sound in the exhaust, like it was breaking up slightly. I heard this same sound on the dyno. My buddy who runs a twin turbo porsche suggested maybe it's an ignition problem. I think my plug gaps were .028, I'll check when i get home. He suggested running .025 instead. Ideas anyone?

 

[Lil Truck]

I experienced a similar problem on the dyno and track, I went to .025 and the problem went away. Fresh plugs, wires, coil, and module also tested. Seems to be plug gap at 4800 rpm and up.

 

[1fastcobra]

I had same problem.
My issues were. The coil ohm was to low.
I put a tester on it. 10.2 - 10.3
It would loose spark.
Replaced with new unit.
Advanced auto. ( yes I know )
Ordered 5 units. Tested all of them with a ohm meter
Only 2 were good. 12.6 on one pack 12.9 on the other pack
Car dosent skip a beat

Posted from the TurboBuick.Com mobile app

 

[toomanymodz]

I'll check the gaps and ohm-check the coil pack when i get home. Hey LilTruck, funny you mentioned 4800 rpm. I noticed that my dyno chart was smooth until 4800, then after that it looked like a child scribbled everywhere. I believe they run a pickup wire off of one of the spark plug wires to the dyno computer. There is definitely an issue somewhere in the ignition then. My MPH should have been closer to 130.

 

[bison]

Pretty sure it was just short of 5200
I will have to find the log
Bryan

If you were on 116 and had the boost up into the 30psi range your converter would have flashed much higher and the peak power would display higher on the dyno.

 

[bison]

I'll check the gaps and ohm-check the coil pack when i get home. Hey LilTruck, funny you mentioned 4800 rpm. I noticed that my dyno chart was smooth until 4800, then after that it looked like a child scribbled everywhere. I believe they run a pickup wire off of one of the spark plug wires to the dyno computer. There is definitely an issue somewhere in the ignition then. My MPH should have been closer to 130.

 

[bison]

What was your eighth to quarter mph increase? If you went 125mph you will typically go 100 in the eighth

 

[toomanymodz]

Bison: Only running 110 octane, 25 psi boost. You're spot on, 100 MPH in the 1/8th. RPMs were 5450 through the traps. On the dyno, the HP was best between 4800 and 5200, then was tapering off after that. And by 5500 the power was falling off a cliff. After looking at my dyno and drag strip pulls, seems that the converter stall is around 4800 at 25 psi.

 

[Phoneguy]

If you were on 116 and had the boost up into the 30psi range your converter would have flashed much higher and the peak power would display higher on the dyno.

I have never dyno'd with 116...nor higher than 21-22psi but I cant wait to push it and see what it will do. Thanks for the tuning you did on my car in May at RCs shop!
I am heading there tomorrow to rebuild the motor. the noise we were hearing was the #4 rod bearing, spun. All of the rod bearings were beat to hell !! The motor only had 38-40 miles on it...

Bryan

 

[toomanymodz]

Oops, my bad. I didnt notice that Bison was referring to your post.

 

[Phoneguy]

I'm curious, what RPM's were your peak HP and Tq ? My torque peaked at 4800, and the HP pretty much was flat between 4800 and 5200, then fell off after that. By 5500 it was done.

I just looked up the dyno run, peak HP at 5806 RPM, peak TQ at 5807 RPM...I didnt remember it being that high actually

Bryan

 

[toomanymodz]

I just looked up the dyno run, peak HP at 5806 RPM, peak TQ at 5807 RPM...I didnt remember it being that high actually

Bryan

I guess that makes sense, since you're running a 224 roller. I would have thought that my combo, given the awesome flowing heads (full CNC'd aluminum GN1's) should be peaking much higher than it's 4800-5200 zone. Perhaps once I figure out this possible ignition issue it will pull much higher and stronger. What also find strange is that my valves are floating by 5800 with PAC 1201 springs.

 

[toomanymodz]

Let me add: The peak HP makes sense with the 224 cam, but peak torque at 5800 doesn't make sense.

 

[Lil Truck]

I'll check the gaps and ohm-check the coil pack when i get home. Hey LilTruck, funny you mentioned 4800 rpm. I noticed that my dyno chart was smooth until 4800, then after that it looked like a child scribbled everywhere. I believe they run a pickup wire off of one of the spark plug wires to the dyno computer. There is definitely an issue somewhere in the ignition then. My MPH should have been closer to 130.

My chart was the same, it finally smoothed out after the plug gap went to .025. I also disconnected my 2 step at the same time, but I believe it is gap (weak spark) with the stock ignition. I tested 2 sets of wires, GM coil and modules new and 40k originals. My top RPM & HP increased a few hundred RPM with better springs.