Made less numbers on the dyno, but I didnt change anything?

[BlueOvalStangGT]

Hey on Friday I tried to finally finish my car. We strapped it down and it put 329 down first run. Last time I was there I made 338. Next try i made 367 but Paul said it was because of my clutch slipping and it really wasnt that high. After somemore tuning it was back to 320-330 but never above 330. What happened? I didnt change anything since last time I was there. I thought I would make some more power with a chip and some tuning but I lost some? Dyno time was cut short becausse of leaking coolant but it wasnt my HG from what I know. So far it looks to be my waterpump.

 

[BlueOvalStangGT]

Coolant was leaking from radiatior hose, no im really scared why my numbers are so low,

 

[BlueOvalStangGT]

Here is a graph of the the time before where we had NO tuning(just dropped f/p a little). Could those bumps in the power curve be from my clutch slipping cause they wouldnt go away.

 

[type911]

7hp is nothing. your hp will hardly ever read the same even if you use the same dyno. just like outside on the street the weather is going to effect you on the dyno as well. they can tune the dyno for the weather but there will always be some margin for error. I wouldn't worry about it too much.

 

[BlueOvalStangGT]

Ok well this time it was around 68-70 degrees out compared to 85-90. AND Wouldnt I gain some HP once its tuned and a chip is burnt??

 

[type911]

Sorry reading comp owns me. missed that. there is still some margin for error but your right. I would have hoped to pick up a few HP from the chip and air temp. Who programmed the chip. can you go back to your original tune and re dyno? Your original tune might have been a little less conservitive then your new tune. better safe then sorry. Where was your timing and A/F last verses now?

 

[BlueOvalStangGT]

My "original" tune wasnt a tune. That was a baseline with a good a/f.

 

[S/CBlack95GT]

To me it looks like it was missing. Do you have an aftermarket ignition?

 

[BlueOvalStangGT]

Not unless you call fms wires and a new cap/rotor aftermarket ignition. Should I invest in a new coil?

 

[BlueOvalStangGT]

Oh and I have the MSD 6btm but it was on 0.

 

[moneypit94]

well there is also one other factor that could be at hand.. I have found this out personally. The belt on the blower could and probably slips. I have went from 9 psi one run to 12 the next to 8 the next...

I always thought that blower belt slipage was just an excuse guys came up with till i saw it do it on my datalog. You could see how it would climb and then come down cause it would start to slip...

The only cure for this is a cog system that i know about.

 

[BlueOvalStangGT]

If it slipped, wouldn't my boost gauge dip down? Cause it just climbed steadily with no drops.

 

[moneypit94]

If it slipped, wouldn't my boost gauge dip down? Cause it just climbed steadily with no drops.

Depends on how much it slipped.. i mean one pound of boost is good for 10-15 hp... maybe you just didn't see as much boost?

 

[BlueOvalStangGT]

Anyone else?