Dyno sheet Whipple Stage 2

[Whipple SC]

I am not sure which setting you are referring to but here is a screen shot of my flare tool when hooked to the car. I did question why the timing block is -.1. Is that normal? I didn't change it at all.

This looks correct, .-1 is normal, just a default setting.

I would like to get a data log.

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[Whipple SC]

Takes a lot to turn the bigger blower, which is the 2.3 VMP and Roush usually make more torque. At least that's how it was explained to me and how I understand it. I am sure Dustin can provide a clearer explanation.

No, not accurate.

All "larger" superchargers take more power to operate to move MORE air. In general, the 2.9L takes LESS power to flow the SAME amount of air as a smaller unit, when in the right airflow ranges.

This one shows low torque, normally they're 30-40rwtrq higher, there are no other PD sc's that make that torque if you leave cams in stock position. Some have played with cams to get more torque, we don't feel it's safe, as most don't really understand the cylinder pressure levels they are creating in those regions.

When SC's are spun near max levels, the smaller SC's make what looks like more torque, because the efficiency falls off so drastically on the higher rpm. If I spin a 2.3L TS to 24,000rpm at peak engine rpm, then spin a 2.9L 19,000rpm to get the same theoretical same airflow. Issue is, the 2.3 VE would fall off, meaning it really has to turn 25-26,000rpm to do the same. Therefore, to compensate for lower efficiency at peak, you have gained airflow down low. Many of the modified guys run into this. We also run into it when we reach max capacity, it's just a standard result of a PD SC.

 

[DrDing.Muscle]

We state to dyno in 4th gear on all vehicles, 5th gear normally results in 190mph which is not safe and will be full into cat saver mode because of the longer pull, therefore reducing power to keep cats safe.

Power will climb to redline.

Interesting. Doesn't this skew the numbers because 4th gear is not 1:1? Not arguing just inquiring what this will do to the numbers if anything.

 

[daltron]

We state to dyno in 4th gear on all vehicles, 5th gear normally results in 190mph which is not safe and will be full into cat saver mode because of the longer pull, therefore reducing power to keep cats safe.

Power will climb to redline.

If using O/R headers, would you recommend a 5th gear pull?

Also, I love your posts in general even if they aren't directed at me. Always fun to learn from you guys!

 

[Whipple SC]

Interesting. Doesn't this skew the numbers because 4th gear is not 1:1? Not arguing just inquiring what this will do to the numbers if anything.

HP is the same, torque reads just slightly less in 4th gear. But, cat saver mode is almost always on in 4th right at the top, but in 5th, it's very soon as the pull is much longer with no real airlow by the cats or engine. The dyno fans are worth about 5-10mph.

On the street, you have airflow going by the cats and in general not going into cat saver as much.

A lot of aftermarket cals turn off or modify cat saver mode so its not as big of an issue, well until cats fail....

 

[Whipple SC]

If using O/R headers, would you recommend a 5th gear pull?

Also, I love your posts in general even if they aren't directed at me. Always fun to learn from you guys!

Well I have huge drums, I never want to have that speed. Some can be as much as 200+mph and that is simply not safe. But, if one doesn't have cats, then 5th is best for it's 1:1. Keep in mind, most can't even do 5th gear pulls because of the hard coded MPH limit issue unless they fool the axle or tire size to get around it.

Great to hear , I like people to be informed. It helps all make better sound decisions based off knowledge vs opinions.

 

[DrDing.Muscle]

I sent you a PM Dustin.

 

[beefcake]

we usually dyno in 4th as well on the manual cars

 

[V8Venom]

No, not accurate.

All "larger" superchargers take more power to operate to move MORE air. In general, the 2.9L takes LESS power to flow the SAME amount of air as a smaller unit, when in the right airflow ranges.

This one shows low torque, normally they're 30-40rwtrq higher, there are no other PD sc's that make that torque if you leave cams in stock position. Some have played with cams to get more torque, we don't feel it's safe, as most don't really understand the cylinder pressure levels they are creating in those regions.

When SC's are spun near max levels, the smaller SC's make what looks like more torque, because the efficiency falls off so drastically on the higher rpm. If I spin a 2.3L TS to 24,000rpm at peak engine rpm, then spin a 2.9L 19,000rpm to get the same theoretical same airflow. Issue is, the 2.3 VE would fall off, meaning it really has to turn 25-26,000rpm to do the same. Therefore, to compensate for lower efficiency at peak, you have gained airflow down low. Many of the modified guys run into this. We also run into it when we reach max capacity, it's just a standard result of a PD SC.

Thanks for the explanation. When you say torque should be higher are you saying with the 3.75" pulley and 72# injectors? Would that still apply if he had 58# injectors? My initial numbers with the 3.75" and 58's were 652/498, then when I went to the 3.625 and 72's I went up to 694/522, which I still thought torque was a bit low, but seemed on par with what everyone else was seeing.

 

[Whipple SC]

Thanks for the explanation. When you say torque should be higher are you saying with the 3.75" pulley and 72# injectors? Would that still apply if he had 58# injectors? My initial numbers with the 3.75" and 58's were 652/498, then when I went to the 3.625 and 72's I went up to 694/522, which I still thought torque was a bit low, but seemed on par with what everyone else was seeing.

You have an auto, he has a manual so you are good. You had an early cal, then got a later cal which had revised cam scheduling. That helped you, plus the pulley change.

 

[V8Venom]

You have an auto, he has a manual so you are good. You had an early cal, then got a later cal which had revised cam scheduling. That helped you, plus the pulley change.

Yea I figured as much. Once I do headers I'm assuming I'll crack 700/540, at least thats my guess.

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