E55 POWER

Two weeks ago I went to the track and the car did 12.6 @ 110mph at the 1/4mi. Yesterday after the ECU upgrade, the crank pulley, BG drag radial, VP racing fuel we did 12.2 @110mph.
I am very confused about the mph I thought that it would be at least 115mph at the 1/4mi, my car has 2,800mi some people say that the motor is not loose yet, please let me me know any thoughts. Since I am not happy with the mph's that it produced.

Thanks,
E55 POWER

Kens-E55

Puerto Rico can be awfully HOT!! Extreme heat is usually the culprit when the mph time is low. The car may not be generating the upper-end HP because of the extreme intake temps. Your time thru the 1/4 is very good however. With this time slip, your speeds should be somewhere between 115-118 depending on your 60' time. Monitor outside temps as well as break-down the different times "through" the 1/4 mi. ie: 1/8 mi, 1000 ft, and 1320 ft. Sometimes they will shoe what the problem is. If it was 100 degrees in Hot Puerto Rico when you ran, I don't think you will get anywhere above 114-115 trap speed.

E55 POWER

I did 1.7 in the 60ft.

Marky

incredible!

Kens-E55

1.7 in the 60' is Excellent!! With that in mind, it sounds more like I stated earlier. I know someone else on this forum had problems with low trap speeds and it was the "intercooler/chiller" not working properly. Study the different speeds thru the 1/4 mi distances. It may show as you were going thru the 1/4, your "rate" of climb was not as strong as it should have been.

James F. Cannon

You may need to check the auxilliary pump that circulates coolant through the intercooler. This is a documented problem that causes loss of power because the ECU limits spark advance when inlet air temp is elevated due to intercooler pump failure. Your 60' time is great but I would like to see the rest of the numbers, 330 ft., 1/8 mile ET and speed, 1000 ft.
Also have been told that the pump failure I mentioned does not show up in the fault codes for diagnosis.

stephens

E55 power
My car had/has the same problem. My best run was an 11.98 at 114mph in 85 degree F temps. The car shoud have been trapping 118+mph with this ET. After plugging in Star diagnostics and test driving, under full acceleration by the time I hit third gear, intake air temp had reached over 180 degrees F.

I had my pump changed yesterday, reduced the coolant/water mix to 20%/80% added a bottle of water wetter and the car feels noticebly punchier from 4500rpm onwards.
Where acceleration felt flat from 5000rpm onwards, it now seems to pull noticebly until almost 6000rpm.

I will soon see if it is more than my imagination, because I will be doing some G-Tech Comp runs tonight (I use it for comparative purposes only) and will check intake air temps and ignition retard on Star Diagnostics tomorrow if weather permits.

James F. Cannon

stephens
Congrats, I see you were able to join the 11 second club. When did this happen? I must have missed the post! I have been thinking about using "water wetter" myself but was concerned about it's effect on seals and gaskets. Any way, keep us posted and good luck tonight (stay out of trouble with the police!)

stephens

James
After your recent 11.8 there seemed little point in posting the 11.98, particularly as we worked out the inlet charge temp rpoblem around the same time.

E55 Power
See my thread on SC Cooling problems. This may give you futher nfo on your problem.

E55 POWER

Thanks to everybody I am going to the dealer tommorow.

Regards,
E55 Power

E55 POWER

The dealer ordered the pump for me, even thuogh they did not find anything wrong with it.
I will get it changed on Wednesday.

Regards,
E55 POWER

James F. Cannon

E55 POWER
Please keep us posted, let us know what you do when you go back to the track. Should easily pick up 3-4 mph if the pump was not working properly!

Vadim @ evosport

Pump can fail intermittently, so keep pressure on the dealer to have it changed out.

e55 baller

E55 Power,

At what mileage did your pump seemingly fail?

You will likely see your 12.2 drop to 11.8 or so at 115-118 depending on the temp and baromoter...try drag racing on a day where the barometer is > 31.0 as it does wonders.

On a day when the barometer was extremely low at 28.4 I managed a 12.2@113.6 with a 1.84 60-foot at an effective altitude of 2,000 fl with just the snorkle mod.

E55 POWER

E55 Baller:
After 100mph or so, it was mostly 3rd and 4th gear. FYI, my pump was replaced and the car feels a lot more consistent in those gears. Also de 1/4 mi was done at sea level and at around 85F.
What snorkle mod did you do?

Regards,
E55 POWER

Happy2th

My 04 E55 ran 12.6 @ 112 with a 2.05 60FT at a density altitude of 2000 FT. It was 75F outside and the car was bone stock with 1000 miles on it and 3/4 tank of gas.

Is that normal? Or should the MPH have been higher?

stephens

Sounds spot on to me. Congrats

Kens-E55

Happy2th,
Based on your 60' time, it seems pretty close to what a normal run would be. If the 60' ft would get down to 1.7-1.8, I think you would see something in the neighborhood 12.5 @ 115 which is right where most of the mags and "pros" have put the beast at!! Good run-everything seems fine.

Vetluver

Pardon my ignorance, I am very new to this forum, but do you keep the traction control on when your running the quarter?

Currently I have as E500 and have found that it is very difficult to get off the line without excessive wheel spin if I don't use it. (skinnier tires than the E55) I notice that you said that you launched at 1000 rpm. Are there any hints or tricks to get the best traction.

I don't have traction problems with my Vette as I have been driving it for 15 years and know the clutch very well. I also have 315s on the rear.

BTW my Vette runs in the high 11s with nitrous. Has anyone added a 150 HP shot to see what it will do?

Happy2th

I ran it twice with T/C on and twice with T/C off. I was able to do .1 second better with T/C off. I didn't floor it off the line, I just pushed the accelerator until I heard wheelspin and then let up ever so slightly, then after the wheelspin stopped, I floored it. Seemed to give me a little better times.

athlon70

Have you guys thought about adding an aftermarket front mount intercooler?

I know on turbo cars a larger intercooler makes a hell of a difference.

stephens

To do so would require a complete re-engineering of the SC system. Modified intakes, casing manifold, not to mention the plumbing for such a system. I thought about adding an air/air intercooler, but dismised the idea as being impractical.

E55 POWER

Stephens:
Thank you for the reply, I was waiting on an answer.

Regards,
E55 POWER

Happy2th

E55 Power, where did you get your pulley and ecm upgrade and how much did it cost? Did you notice any decrease in idle or ride quality when cruising? Any negative effects at all? Is there a pretty noticeable seat-of-the-pants difference?

E55 POWER

Happy2th:
There is a Speed Shop here in PR that did the work for me his name is Oscar Velez, he is well know for tuning BMW's & MB's. Most of the M3's in Speed Challenge are tuned by him. His phone number is 787-891-2457, and yes the difference is the car is noticeable, no negative effects and ride quality is fine.

Regards,
E55 POWER