Why have I lost 20hp+?

[tom_sprecher]

Unless it was the same dyno, the results mean nothing.

If it was the same dyno, and it was colder the 2nd time, then you have something to look into. Most likely bad gas.

^^^ This on the different dyno. Maybe not bad gas, but summer vs. winter blend?

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[KT3]

^^^ This on the different dyno. Maybe not bad gas, but summer vs. winter blend?

Same dyno... Could be the blend of fuel

 

[NoVaGT]

^^^ This on the different dyno. Maybe not bad gas, but summer vs. winter blend?

Same dyno... Could be the blend of fuel

Dunno. I'm thinking it's gas related. Like 87 octane got put in the 94 octane under-ground tank or something.

 

[KT3]

Dunno. I'm thinking it's gas related. Like 87 octane got put in the 94 octane under-ground tank or something.

But my car is tuned for 94, if that was the case then wouldn’t my car get a check engine light or something because the level of the octane didn’t match the tune... ?

 

[NoVaGT]

But my car is tuned for 94, if that was the case then wouldn’t my car get a check engine light or something because the level of the octane didn’t match the tune... ?

I don't know. I don't know the specifics of your tune. It could be the car can still adjust for a lower octane rating. Something to ask your tuner.

 

[WildHorse]

But my car is tuned for 94, if that was the case then wouldn’t my car get a check engine light or something because the level of the octane didn’t match the tune... ?

No.

 

[drive_55_not]

But my car is tuned for 94, if that was the case then wouldn’t my car get a check engine light or something because the level of the octane didn’t match the tune... ?

These cars do not monitor octane, the only way a CEL will be thrown is you're getting misfires from too low octane and too much timing.

I'm with the guys questioning your 472rwp on gas .. I'll give it that you Canadians do have some weird air up there with some of those time slips they've posted.

My old Gen3 A10 'only' laid down 465rwhp @6900 with E85/LT's and full 3" O/R exhaust. Which from what I've seen is average for a Gen3 A10, M6 cars dyno 480-490rwhp, with some pushing 500 on corn.


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[KT3]

These cars do not monitor octane, the only way a CEL will be thrown is you're getting misfires from too low octane and too much timing.

I'm with the guys questioning your 472rwp on gas .. I'll give it that you Canadians do have some weird air up there with some of those time slips they've posted.

My old Gen3 A10 'only' laid down 465rwhp @6900 with E85/LT's and full 3" O/R exhaust. Which from what I've seen is average for a Gen3 A10, M6 cars dyno 480-490rwhp, with some pushing 500 on corn.

I have people in the states surprised I’m not
making 480+ lol. Canada has better fuel.

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[WildHorse]

These cars do not monitor octane

They do monitor octane. With Fords proprietary 'adaptive octane logic'.

 

[Idaho2018GTPremium]

Can you post your two dyno graphs? I've seen many times where a peak value is quoted, but only to be found to be some arbitrary spike at the end of the rpm range.

Also, fuel and different ambient conditions could affect it as well. Another thing to watch out for is some shops will quote PS, which is higher than hp. 1 PS = ~.987 hp. If your first run was in PS and your 2nd in hp, that would close the gap. I realize it's the same shop, but if they were trying to "sell" you on the mods, then I can see them doing that. Most people wouldn't know the difference. Another is one could be SAE corrected while the other not corrected. Then if there's a spike as I mentioned, the difference may be just semantics.

 

[KT3]

Can you post your two dyno graphs? I've seen many times where a peak value is quoted, but only to be found to be some arbitrary spike at the end of the rpm range.

Also, fuel and different ambient conditions could affect it as well. Another thing to watch out for is some shops will quote PS, which is higher than hp. 1 PS = ~.987 hp. If your first run was in PS and your 2nd in hp, that would close the gap. I realize it's the same shop, but if they were trying to "sell" you on the mods, then I can see them doing that. Most people wouldn't know the difference. Another is one could be SAE corrected while the other not corrected. Then if there's a spike as I mentioned, the difference may be just semantics.

 

[WildHorse]

Looks good to me. I wouldn't worry about it.

 

[KT3]

Looks good to me. I wouldn't worry about it.

What makes it look good? I made 20 less today lol

 

[CorvZ061]

A little research shows Canada switches to winter blend fuel on September 15th. If your last dyno was prior to that you were on summer blend fuel. That alone could account for your 20hp.

 

[KT3]

A little research shows Canada switches to winter blend fuel on September 15th. If your last dyno was prior to that you were on summer blend fuel. That alone could account for your 20hp.

That’s all I needed to hear. Yeah the FBO was before September, it was in August actually now that I recall....

Makes sense.

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