Spinning out of control.....power to the max......
You know it is the most powerful....whats the cost for a run???????????????
Good Luck....
tony

:smash: :smash: :smash: :smash:

 

:looks at the clock....... looks at teh calender....::

WHERES THE RESULTS?

:lol:

 

:confused: hope everything is OK

 

This just in, they need to buy a new Dyno because some loser told them they didn't think their Corvette would be powerful enough to overrun the damn thing.

J/K

Where are those numbers? Ready when you are.

 

This can't be good; Jesse always comes back with results quick. :confused:

 

Guys,

Sorry for the delay in posting. I had a party yesterday and I tried to drink Fridays experience away, so now my head is a little foggy. :rolleyes:

Hear is the scoop for Fridays dyno tests...

Not a good one mind you :cuss Let me first say everything is fine with the car, well sorta.

One the warming up of the car to get the fluids all heated, the Romulator piece of chit started cutting out as it did before :banghead: So basically the ability to use it to tune was trashed before we even made the first run. :cuss :mad

Like a dummy I did not bring my other stuff, so tuning was trashed. But I figured I would give it a whirl anyways since the car was all strapped down.

We made the first pull and forunately the guy that was there was a big racer and had his Dad bring over his weather station. The DA was 3400ft :rolleyes: The car put out 399hp and 450+ft-lbs. I don't have the sheets here infront of me as they are still in the car.

I was a not real concerned about the numbers as the DA sucked, and I was more pissed at the romulator failing. But that is Murphys law.

We did a few runs on the dyno with the AFR. All the runs were a little on the rich side, but I contribute that to the new Walbro pump. I can easily fix that.

Here is the bad part.

After draggin the last time 2 weeks ago, upon pulling out to get in the staging lanes, I instantly noticed that the rear felt "tighter" as if the two wheels were locked, not allowing the inside one to turn slower than the outside radius one. :rolleyes: I dismissed it as possibly just the sticky slicks on the back. As my 60' times stayed the same.

Then Yesterday I put the street tires on the car so I can drive it on the street. Yep you guessed it. They are locked one-one :nonod: When I turn a corner sharp the car sorta jerks around the corner. *&^%! That rear did not last long :lol:

I did some pretty hard takeouts, and I would imagine that for dragin its probably alright. I know that you can use different shims etc to make the rears tighter like that, but obviously something has changed in mine to make it like that.

Corky just had his all apart and fixed his busted up spider gears, but he's on vacation, so I might not be able to contact him to see what he thinks it might be, and to see if racing it in two weeks is advisable or not. When its up on the lift, I can easily turn the wheels either direction, so I don't think there is any meshing problems.

What do you guys think. I am not a differential expert....Give me your thoughts. Thanks.

Again sorry for the long delay is reporting... :cheers:

 

This really shows how the weather can stomp out power. I wouldn't have thought that it would have this much of an impact, but the numbers don't lie.

What was the DA on your first dyno test? :cheers:


[Modified by Hole-Shot, 11:29 AM 7/13/2003]

 

What type of dyno was this dyno, not a Mustang,, yes/no?

 

That sucks on the rear end, Jesse. One question though how did the weather have anything to do with your power outputs? Didn't the dyno correct for standard weather conditions?

 

:sad: :sad: :sad:

I was really hoping for good results. Wnated to see if the extra fuel bought you anything in th eupper rpm range. sounds like you never got there :sad:

Well i hope you get it sorted out, but first work off that hangover.

 

Jesse, do you know what the air temp and air pressure was? If so we can correct to SAE standards.

 

Just out of curiousity...... what is DA? Altitude?



[Modified by LT4 2 Fast, 4:16 PM 7/13/2003]

 

Try starting with 5280ft and a crappy weather day, on a bad day here in Denver you could see a DA of 9,000 ft +.

 

Guys,

I looked at the dyno results last night in a little more detail. The results were not as bad as I thought while there. The HP was always around 380-399 rwhp. And the torque was in the 480-490 range for most of them. And it only lost about 60 ft-lbs through the RPM range.

I did see even with the tune off a little, the torque maxed at ~3800 RPM. Still power ended at ~5100 RPM. I am going to lower my shift points from 5400 to 5000 even next track appearance to see if that helps me gain a little.

Maybe that SR just can't breath past 5100 RPM on that engine.... :confused:

I bet that car would haul some serious butt with a miniram on it, or a stealthram.

If I know of someone with a carb setup that would work on it I would also like to try that. I bet that thing would fly ... :cheers:

Someone asked what kind of dyno it was....This was a dynojet...the first one I dynoed on was a mustang.

The weather was much different...Hot and humid this time, the last time it was about 30* cooler. So the changes I saw were somewhat explainable.

Also as a side note. I spoke with Corky and he said that he thinks the rear just needs more of the limited slip additive added....So tonight that is the game plan. Open it up and dump in a few more bottles. Hopefully it will take care of the problem, but I never get that lucky to have a quick fix like that. :smash: :D

 

Wow, I always thought the SR went to @ 5700 which only matters when you want to spin that high.

 

DA= Density Alltitude. It is the alltitude that the car or aircraft thinks it is at due to tempature and humidity, at sea level on a 100 degree day the car will perform like it was at say 2000 to 2500 feet above sea level. IE thinner air= less perfomance, to compensate you can turbocharge or supercharge. :cheers:


[Modified by kabnvtt, 3:37 PM 7/14/2003]

 

yeah maybe on a 350, but the 406 will choke sooner.

Jesse, it sounds like both yno numbers were not corrected to SAE or Std dyno measurements. I know you couldn't mess with the tune up, but did you try turning up the FP?

 

vette_tweak, you must have a 6 speed car based on where your dyno run started. if so, then the torque converter on the auto car may have influenced the torque results.

 

reallycoolcorvette, you're correct... it is a 6 speed car. Of course...Ski's max torque was at 3400 RPM...I wonder if the stall RPM is > than that?

I've dug out some data in an effort to try and make a decision about what intake to go with. Here's what I found...

Offered by LPE in 97:
420CID EFI, 510 BHP, 562 ft/lbs, 11:1, 1600-6000 RPM range, mild ( for this engine ) Accel 74219 Hyd. cam, CNC ported Brodix Track 1's ( Cork, they seem to work for him ), SuperRam base/plenum/runners
Note: the dyno sheet supplied with the engine shows a HP peak at only 5200 RPM!! ( Ski...I guess you're right about that rpm limit!)

From TPIS:
test engine is a 383 w/ AFR heads; test conducted by hotrod magazine in 92
SR max torque = 459 ft/lbs at 4750 RPM; max HP =449 at 5500RPM
MR max torque = 437 ft/lbs at 5250 RPM; max HP =487 at 6500RPM

I think we all know that each intake requires a different cam/head combination to maximum it's power potential. It looks as though the MR is definitely the ticket for max HP. The big problem that I have with it is that it feels "rough" at anything below 50% TPS or < 3000 RPM and occasionally "coughes" when I crack the throttle. Tuning? Maybe...seems to be a common complaint.

Does anyone have data on a stroker using an EFI'd Victor Jr? :cheers:

 

You asked about a stroker using an EFI'd Victor Jr. I've got a 427 with the Holley Stealthram. In case you're not familiar with the Stealthram, they took the bottom half of a tunnelram and put a plenum on top of it. Unfortunately, my engine is not yet started, :nonod: let alone tuned, :sad: so I'm probably a couple months away from having good data. But, I agree with where I think you were going with the question. :steering: