KStromberg
Vortech kicked in yo
Hmm, same rwhp pretty much as the T-Bird SC you have that runs high 12s.
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Dyno Tomorrow
- Thread starter DLF
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DLF
New member
Nah, it's been a while since the SC was on a dyno, it's probably closer to 320 now. Look at the MPH.
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DLF
New member
The loops are when the TC locked. They didn't want to wait around while I adjusted it to lock sooner.
I used a very conservative 15% driveline loss when I came up with that guess. What's your guess and why?
driller
El Presidente
I'm just saying whatever the parasitic driveline loss is, it is nearly the same at a modified HP level as it is stock.
Let's say a stock 290 HP LSC puts down 232 RWHP for a 20% (58 HP) loss to the driveline. If you add HP, the driveline loss is not 20% of the higher HP number. For example, say you gain from 232 RWHP to 300 RWHP. Your flywheel HP will be slightly less than 300+58=358 rather than 300/0.80=375.
But to answer your question, I have found my numbers used to be approximately 17% driveline loss or about 48 HP. I think your flywheel HP would be 350ish which is why I said 360 may be a bit much.
Regardless, it is obviously significantly more than stock and certainly an admirable achievement.
DLF
New member
So...But to answer your question, I have found my numbers used to be approximately 17% driveline loss or about 48 HP. I think your flywheel HP would be 350ish which is why I said 360 may be a bit much.
Regardless, it is obviously significantly more than stock and certainly an admirable achievement.
303+48=351 - Your guess
303/.85=356 - My guess
Thanks!
Edit: I found the HP calculator on Drag Times very interesting.
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KStromberg
Vortech kicked in yo
Time for Cobra cams and electronic exhaust cutouts.
I'd be curious what would happen if you shorten the runners on the intake also. Geez all these ideas make me feel like your car still has plenty of things to play around with yet. I see 12s in your future.
I'd be curious what would happen if you shorten the runners on the intake also. Geez all these ideas make me feel like your car still has plenty of things to play around with yet. I see 12s in your future.
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DLF
New member
The powerband would move up the RPM scale. How far up would depend upon how much the runners were shortened.
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DLF
New member
Would I say it if it wasn't?
Look at these dyno runs from my Cobra from 10 years ago.
The green trace was with the stock intake and peaked around 6100 RPM's.
The red and blue traces are after the installation of a short runner intake and peak around 6400 RPM's.
The sole purpose of a short runner intake is to move the powerband up in the rev range.
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46callaway
New member
Nice numbers, it looks like they are somewhat inflated however due to the torque converter flashing. Impressive nonetheless.
DLF
New member
The 303.12 RWHP isn't the least bit affected by any "torque converter flashing". The TC was locked way before the HP peak.
The torque figures however are a result of the peaks when the TC locked, and I addressed that.
Thanks.
46callaway
New member
I'll be taking my 98 LSC on the rollers (dynojet) on the 23rd. I'm hoping for a modest 260rwhp off the spray.
I was more wondering if it is possible to shorten your cobra manifold runners. I guess that would mean you would have to switch to yet another intake manifold if it was so desired.Would I say it if it wasn't?
Look at these dyno runs from my Cobra from 10 years ago.
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KStromberg
Vortech kicked in yo
Why couldn't he just modify the one he has on the car now
DLF
New member
No need to switch, but it's a huge PITA to do. The runners are epoxied in, so the epoxy bond needs to be broken, the runners removed and shortened, and then epoxied back into place.
It's not something that I'm likely to do again.
KStromberg
Vortech kicked in yo
I guess the real question would be, with all that hassle, besides shifting the curve higher, would it gain you any quantifiable horsepower that would net you a better et.
DLF
New member
Who knows?
I picked up 15+ HP (above 6K) and ~3 tenths in my Cobra back in the day, but I'm not sure what the results would be with the Mark VIII intake cams, less gear and an automatic transmission.
Probably wouldn't hurt, though.
KStromberg
Vortech kicked in yo
Those Cobra cams you have in stock could likely compliment this idea.Who knows?
I picked up 15+ HP (above 6K) and ~3 tenths in my Cobra back in the day, but I'm not sure what the results would be with the Mark VIII intake cams, less gear and an automatic transmission.
Probably wouldn't hurt, though.