Just a memo, As many have read my threads discussing "power and perfect modulation of the pedal", it seems that my stock 996 with its heavy dual mass fw, little turbos and little power was VERY balanced and perfect to modulate around turns on the track.

I get turbo surge as i slowly modulate power into the 4k rpm range. Worked with many shops, Proto looking into throttle plate opening completely at half pedal, remapped my ecu multiple times, i just race using 4th and 5th gears to de-tune the car and surge.

my instructors for the past couple seasons think i cant keep a steady pedal, i try to explain, then when they drive my car, they understand but to stay on topic, 580hp with smooth incremental power, perhaps just a dream.

I am looking at gt3 / cayman / bmw as a track car now. Perhaps it will just be best to leave the 996tt as a street car but it still doesn't resolve the reason why i went to proto, per phone call discussion = smooth linear throttle power. Didnt happen.

As always I thank this forum and all the acquaintances made here for all the help along the way !!

Dean.W.

 

There is less turbo surge with K16/24's, than the 24/18G's. The 24/18G's hit much harder and more abruptly. The K16/24's are more like the OEM delivery, just more powerful.

 

Dean,

We recently retuned 2 cars converting each one from a greddy ebc back to factory boost control. Both customers have reported back much better throttle to boost modulation.

In general a factory ECU "properly mapped" will do a much better job at boost modulation at part load.

-Tony

 

I had that problem with my 944turbo stageII at seal level. power would surge at about 4k and the rear end would come around in turns. Kinda fun actually and since I am not a great driver it didn't make a difference to me. Now that I am at near 6000 ft. that car doesn't make enough power to do squat. I really feel the power loss at this altitude. Maybe you should move to Denver and that will solve your problems

There are several people here that are at your power level and they do not have the surge issues. I think Mikelly is one, maybe he can elaborate, but from the vids of him I have seen, his car seems to have a very smooth power band. I am sure he's not the only one.

seriously, hopefully the knowledge on this forum can help you figure the problem out. I'd hate to see you go to a lesser car

 

Thanks Tony, maybe if i find someone to swap my ecu and 18g's for 16/24's you can help set that up. I really dont even want to spend another $5-7k on a new setup. But maybe i can somehow sell my ecu ( i still have the gt640 giac ecu to sell ) and re-coop some $$$ . I am hearing the the 16/24's are less power but more stable.

 

If you want to adjust part throttle boost, just buy the new HKS EVC 6 boost controller.

IMO its the best in the market. Has ability to adjust boost by throttle,RPM and Speed input.

For more info;

http://www.hksusa.com/products/?id=3208

 

I have used this myself and agree its a fantastic product.

Keep in mind that the stock ecu will do all the same functions......

 

To hook up the RPM, Throttle, Speed, etc. it is a pain in the *** and I didn't even try. Thats the boost controller that I use. It is a very nice piece though! I would recommend it to anyone.

 

Tony-
For guys like me who run both race gas and 93, the Greddy's main function is it's ability to adjust accordingly by pushing the low/high button. By going back to stock/factory, are you able to make adjustments for different octane fuels w/ one map?

 

I agree with others that the EVC VI is a great product. I haven't hooked up TPS or speed bc I data log it elsewhere but the RPM hookup is very easy. Take OBDII port loose and stretch it out a bit and you will find a violet and green wire. Tap into it and run it to the appropriate wire leading into the HKS. From there it's a matter of following the setup steps properly to incorporate it into the data stream and on the actual display. I think it's more important than the other 2 as you can see the RPM and boost level as well as when your offsets begin to function relative to the two.

 

Al, thank you very much! My offset setup is really weird (I only can get boost to change from going to 150-199 on the offset). Hopefully with the RPM hookup I'll hopefully have more adjustment. I'll be setting that up when I put the car back together!

Thank you again for the tip!

 

Look at the values as i gradually increase my pedal position, at 4k rpm the car LEAPS into full open throttle despite me being only halfway.

notice the jump at half pedal , 36 to 99 !

12:15:23.9610714 4804 50.39 36.71 34.5
12:15:24.2491002 5011 52.79 99.97 100.8



Time RPM Pedal value Spec. throttle plate angle Actual value, throttle Spec. throttle plate angle 12:15:09.2746029 3968 0 10.18 10.2
12:15:09.5626317 3927 0 10.1 10
12:15:09.8506605 3888 0 10.06 10
12:15:10.1226877 3855 0 9.94 9.9
12:15:17.2744028 3053 1.99 8.5 8.4
12:15:17.5464300 3027 4.39 8.83 8.5
12:15:17.8344588 3034 7.79 9.34 8.8
12:15:18.1054859 3021 10.59 11.63 11.4
12:15:18.3785132 3073 16.99 16.2 15.9
12:15:18.7295483 3065 22.19 19.46 19.3
12:15:19.0325786 3112 27.19 22.89 22.5
12:15:19.3046058 3164 30.39 24.61 23.6
12:15:19.5926346 3236 32.39 27.14 27.1
12:15:19.8806634 3312 32.79 26.24 26
12:15:20.1686922 3384 32.79 25.73 25.8
12:15:20.4567210 3458 34.99 26.4 25.3
12:15:20.7447498 3543 36.19 29.85 29.9
12:15:21.0327786 3633 37.79 30.14 29
12:15:21.3208074 3732 39.39 36.12 37.6
12:15:21.6248378 3846 39.39 30.98 30.9
12:15:21.9128666 3954 42.19 35.51 34.1
12:15:22.2008954 4048 42.19 33.24 33.5
12:15:22.4729226 4168 43.79 36.18 36.4
12:15:22.7769530 4283 43.79 35.25 35.2
12:15:23.0649818 4404 45.79 39 39.5
12:15:23.3530106 4541 48.79 40.05 39.1
12:15:23.6570410 4679 48.79 33.99 33.3
12:15:23.9610714 4804 50.39 36.71 34.5
12:15:24.2491002 5011 52.79 99.97 100.8
12:15:24.5371290 5245 52.79 99.96 99.8
12:15:24.8241577 5466 53.79 99.96 99.9
12:15:25.0961849 5693 57.19 99.98 99.9
12:15:25.3842137 5911 61.39 99.99 99.9
12:15:25.6722425 6122 69.19 99.99 99.9
12:15:25.9762729 6309 69.19 99.99 99.8
12:15:26.2483001 6495 79.79 99.99 99.8
12:15:26.5203273 6677 94.39 99.99 99.9
12:15:26.7923545 6849 99.99 99.99 99.9
12:15:27.0803833 7013 99.99 99.99 99.8
12:15:27.3524105 7198 99.99 99.89 54.7
12:15:27.6404393 6790 0 10.79 10.5
12:15:27.9284681 5111 0 10.64 10.7

 

I've only had my Proto K24/18s a short time but I haven't noticed any surging with my car, not yet anyway. I've played around, just as you said, with half and 3/4 throttle and it's felt pretty good to me. Although I think a very good possible solution for you is the HKS boost controller. It's sort of a have you cake and eat it too option. Good luck!

 

Its not the ecu nor the greddy...something else is wrong....
He can turn off the greddy altogether and run springs only.... 1.1/ 1.2 bars all day long...

 

Throttle plate control is very dependent on load(a calculation of airflow) and acutal air flow in an me7 DBW car. Its very possible the issue Dean is experiencing is not present at the air flow level that relates to the boost controller being off.