soroush
Ford Gt Owner
- Aug 8, 2007
- 5,256
hmm change one word around and all of the sudden you can charge 50k for an engine now!:rofl
ya now its really funny! my mistake
GT 200MPH Speed Day/Mojave Mile Update Thread
- Thread starter skyrex
- Start date
hmm change one word around and all of the sudden you can charge 50k for an engine now!:rofl
ya now its really funny! my mistake
Got the story from Skyrex and some pictures and will have Ford Racing send it out in their next newsletter. Thanks guys!
Matteo,
You wouldn't be done with it for very long though. The techs on the Matech Team told us that engine was only good for 25 hours!! At $50,000 a pop, or $2000 an hour, that's some expensive NA power. I guess when you're playing at that level, 50K engines are no big deal. Our friend Ray will be able to give us an idea of how long that engine will last in a bit less extreme environment.
Chip
911teo
GT Owner
True that, but an engine rebuild is usually in the $10-12k region (valves and pistons are the culprits, and u re-bore the jugs as well).... but I take your point.... :thumbsup
Superfly
HERITAGE GT OWNER
Fast Freddy
GPS'D 225 MPH
^^^^ - if i had that much power i think that i could hit 250 mph out in Area 51 :cheers
they just repaved the road last month and it is good to 300 mph now :biggrin
they just repaved the road last month and it is good to 300 mph now :biggrin
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I think it makes sense to upshift at the 6K revolutions, to keep the torque near its maximum. (looking at Kendall's curve of Apollo's car)
Mullet
FORD GT OWNER
here is mine
looks like at 4250 rpm they are making the same power and Apollo's spikes quicker. I would be curious to see how the spike affects traction in third gear doing freeway pulls or even Mile runs. I know I NEVER get wheelspin in third which might give me an edge if Apoolo's car spins in third on a freeway run. I believe at 4000 rpm he is making a noticable amount more power than the other TT 1000ish hp cars I have seen.
I do like the extra peak torque he is making compared to mine.
At the mile it seems the little extra I have down low pretty my washes out with his quicker spike to peak power.
I'd shift that car at 6500 if it were mine,
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BlackICE
GT Owner
When to shift depends on your engine's torque curve and your gear ratios. You want to maximize the torque at the rear wheels. You should shift when the torque to the rear wheels will be greater in the higher gear than staying in the lower gear. The gearbox spacing is not even, so that ideal shift point is different in every gear. Also since you cannot shift in zero time, if you are near the finish line sometimes it is best to leave it in a lower gear than to shift, losing some speed by shifting.
This information is theoretical and not from my mile experience. I don't have that many runs to claim any experience, compared to many on this forum. :lol
This information is theoretical and not from my mile experience. I don't have that many runs to claim any experience, compared to many on this forum. :lol
Mullet
FORD GT OWNER
I though torque GETS you going and HP KEEPS you going?
I'd rather shift when the HP starts to drop (looking at my graph I shift right before the fuel cuts).
Mullet
FORD GT OWNER
Keep in mind that these are specific results for a specific system with a custom tune. For this car shifting at 6K may make sense. For your car perhaps not. When you make that 7K shift in 4th to 5th you are putting yourself at a better RPM starting point for 5th. I will be writing it up later once I get the full results to post from our day with pics and vids, but I did two separate things on my best runs. (231.5 and 231.1) On one I shifted to 6th early and in one I stayed in 5th till the end. Staying in 5th till the end I hit the rev limiter shortly before the finish line and it cost me a couple mph. In 6th for my car anyway in depended on when I got in it. 6th would still pull and I have a good vid from my second best run that will help you see that. (I did not have vid from my best run.....my camera hates me :ack :lol)
The best pulley/tune run of the day on a 91 Heffner tune was a 205.8 and he went to the rev limiter everytime. I think for the pulley cars getting into 5th from a 7K shift is the best plan, but I could be wrong. I am pretty sure when Mullet did his 195.5 on a pulley in Texas he went to the limiter. Stunts on Sunday did a 188.7 for his best run by leaving it in 4th till the rev limiter. On Saturday he posted a best of 202.8 shifting that way as well. It really depends on your specific car. Maybe a dyno run would be in order to see what you are really getting. :cheers
The best pulley/tune run of the day on a 91 Heffner tune was a 205.8 and he went to the rev limiter everytime. I think for the pulley cars getting into 5th from a 7K shift is the best plan, but I could be wrong. I am pretty sure when Mullet did his 195.5 on a pulley in Texas he went to the limiter. Stunts on Sunday did a 188.7 for his best run by leaving it in 4th till the rev limiter. On Saturday he posted a best of 202.8 shifting that way as well. It really depends on your specific car. Maybe a dyno run would be in order to see what you are really getting. :cheers
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PeakCompletions
Boost is an addiction...
on all of my mile runs the key was to keep the car "in boost" and at "boost level"...
in talking with Apollo he didn't have to powershift and that is a testament to the speed of these cars...
with my bigger turbos, and with the original turbo setup at C&D, we found that shifting at the higher RPM even if the curve fell off a little bit made up for the quicker reaction of the turbos in the next gear...
on the pump gas original Heffner turbo system we found that alone was worth about 3-4 MPH in the 0-200-0 shootout.
note though, that this was especially important with the big turbos as even a second of spool time would affect the run...
in Miami, when shifting at the higher RPM, I couldn't get the transmission to synchronize the 4 - 5 and as such for the whole day I thought I was "missing shifts"....
blasting it up and down the access road "practicing" the 4-5 at WOT I was able to figure out that at our power level I had to "short shift" it at 7K like Texas...
Of course the last run short shifting at 7k despite a little turbo lag still worked out pretty good... :biggrin
so there is definitely a balance and every configuration is a little different...
the only way to know for sure is to try it :cheers
in talking with Apollo he didn't have to powershift and that is a testament to the speed of these cars...
with my bigger turbos, and with the original turbo setup at C&D, we found that shifting at the higher RPM even if the curve fell off a little bit made up for the quicker reaction of the turbos in the next gear...
on the pump gas original Heffner turbo system we found that alone was worth about 3-4 MPH in the 0-200-0 shootout.
note though, that this was especially important with the big turbos as even a second of spool time would affect the run...
in Miami, when shifting at the higher RPM, I couldn't get the transmission to synchronize the 4 - 5 and as such for the whole day I thought I was "missing shifts"....
blasting it up and down the access road "practicing" the 4-5 at WOT I was able to figure out that at our power level I had to "short shift" it at 7K like Texas...
Of course the last run short shifting at 7k despite a little turbo lag still worked out pretty good... :biggrin
so there is definitely a balance and every configuration is a little different...
the only way to know for sure is to try it :cheers
Apollo
GT Owner
on all of my mile runs the key was to keep the car "in boost" and at "boost level"...
in talking with Apollo he didn't have to powershift and that is a testament to the speed of these cars...
with my bigger turbos, and with the original turbo setup at C&D, we found that shifting at the higher RPM even if the curve fell off a little bit made up for the quicker reaction of the turbos in the next gear...
on the pump gas original Heffner turbo system we found that alone was worth about 3-4 MPH in the 0-200-0 shootout.
note though, that this was especially important with the big turbos as even a second of spool time would affect the run...
in Miami, when shifting at the higher RPM, I couldn't get the transmission to synchronize the 4 - 5 and as such for the whole day I thought I was "missing shifts"....
blasting it up and down the access road "practicing" the 4-5 at WOT I was able to figure out that at our power level I had to "short shift" it at 7K like Texas...
Of course the last run short shifting at 7k despite a little turbo lag still worked out pretty good... :biggrin
so there is definitely a balance and every configuration is a little different...
the only way to know for sure is to try it :cheers
Ray, I appreciate the tips before the mile. It helped me so much to develop my strategy.
I did not speed shift but experimented around a lot with different RPM shifts in each gear. Black Ice is right also, I noticed much better acceleration by using different RPMs in each gear. Generally, I went higher in each gear as I went up. As Ray points out, the real key is staying in boost. I wish I could have put together a full run doing this as I think I would have taken off! Even though my speeds were good,I feel there was a lot I could have gained by speed shifting. I did feel boost drop when I was not efficient in my shifts even though my speeds were good. - I must give credit where credit is due, the car is really fast! :eek I only got two chances at the standing mile and I did soft starts on both with roll ups through the first two gears. I know I had a 230 in there is I could have put it all together. few more passes and I know I would break 230. :banana
Same with the 1.3mile. I really never started a whole lot different since I was playing around with the shift points and did not want to wonder if it was a start or shift that made the difference. I was close to 60mph starting on my fastest 1.3 where the others I did were around 40mph.
Mullet, I was getting a little wheel spin on the top end of third, But it was only when I was short shifting second by a bunch, (5500), I was spinning like crazy on the top of second with full throttle, so I had to either roll throttle on through second or short shift. I would get a little blip but nothing I had to let out of or correct steering. :thumbsup
TC
Apollo
GT Owner
Mullet
FORD GT OWNER
You Mojave guys need to get a Vbox, it will help you figure out some of this and you will be able to measure 60-130, 0-200 and any other increment you want.
http://vboxusa.com/store/index.php?main_page=product_info&products_id=1&zenid=c6992facdeb1b8927b1cca6f11584cb0
http://vboxusa.com/store/index.php?main_page=product_info&products_id=1&zenid=c6992facdeb1b8927b1cca6f11584cb0