robnyc

delete.

rsalco

Need to see 1/4 mi. data to see if the dyno numbers equate with a performance increase. Other tuners claim significant power gains, but the 1/4 mi. numbers don't reflect that. For example, Renntech claims similar gains to these guys, but their test car runs 11.2 @ 126, same as a stock car on good gas. And Weistec claims a 24% increase in power and "the world's fastest GT-S" but their 10.89 @ 127 is only less than 3% quicker with the same trap speed. More relevant would be rolling start, 50-90mph, high-gear roll-on numbers. Real world driving where mid-range and area under the curve is king.

robnyc

delete.

rsalco

All of these tuners use chassis Dyno's to measure RW HP, not flywheel (crank) HP. Only engine builders have Dyno's to measure actual motor HP net of power transmission and friction losses (typically 15%).

emericr

Bottom line is that a stock car will not be even close to 10s and seem to be in the range of low 11s.
About 1/2 second quicker is proof enough that the tune is generating substantial power over stock.

AMG 17GT

Yeah but the big elephant is why you would subject your GT to an independent tuner with no history/warranty /validity??

Seriously ....

rsalco

.33 sec., or 3% quicker. No increase in trap speed. Against a claimed 24% increase in power.


However, the ECU has a torque management regime which is probably limiting the launch & 1st 60 ft., even in race mode. It would be interesting to see the time put down on drag radials.

rsalco

Because that's what guys do....

emericr

There is an increase in trap speed. Magazine numbers on reviews are usually adjusted and not the actual raw ones.
Looking at motor trend worlds greatest race the gts did 11.4 in 15 and 16 at 124 and 126mph respectively .
Comparing that to Renntech for example at 10.9 and 128mph that is a substantial difference.
I am not sure you realize how difficult it is and how much horsepower it takes to just shave a few tenths and a few mph when you are dealing with supercars.
I also agree that I would not take a chance with an unknown tuner and stay with the most respected in the industry (weistec, Renntech and Eurocharged in us)

rsalco

Beg to differ on trap speed..... two different road test 1/4 mi runs, have trapped the stock car at 126, as did Weistec. Renntech's test car ran a 10.949 @ 128. The car was modded with ECU flash, downpipes, 200 cell cats, and full exhaust. Weistec has since gotten down to 10.896 @ 126. Also tune, downpipes, low restriction cats, CAI.


Frankly, these differences are within common DA variations from day to day at any given track.


Again, IF the HP gains claimed are valid then something is holding these modified cars back and I suspect it is the ECU torque management. 'Vette guys have had to figure this out as well because their cars also utilize the torque strategy to keep the car on the edge of traction in lower gears.

emericr

If you don't believe the tune makes power then don't buy lol. I agree that the ecu/tcu is managing the power so that it gives you the best traction.
Why do u think the 707hp hellcat finished last in the world greatest race#6?
However I can assure you that my tuned gt will be quicker and faster than a stock gts on the same day wether it is from a dig or from a roll.
I could not even get my rwd 700+hp Cls to do low 11s on street tires. Best I got was 11.5. Compare that to stock rwd unit and that is about 1/2 sec quicker. Again that is consistent with the difference in stock and tuned gts.

rsalco

Make sure to post up your time slips. Where will you run?

emericr

I will probably run in Bradenton or PBIR and will post results.

rsalco

Got a timeline? My eldest daughter winters her horse business in Wellington & I wouldn't mind catching up with you at PBIR in conjunction with a visit to her.

emericr

I will ping you when I go. I plan to go multiple times as I like to understand the before and after. Msg me your cell if you don't mind and look forward meeting you.