Twin MP70's on an LS3 416 w/ AFR 225's
01-08-2011, 06:53 PM
#283
Went back out today. Still no 2 step. Wiring guy is slacking. Car went 10.34,10.42,10.38 all at 130.XX. Really soft 60 due to there being no boost on the tbrake and the full 4 psi doesn't arrive until right at the 60'.
As to why there is no boost on the transbrake, He is running 2 44mm wastegates which is way more wastegate than he needs. You gotta remember that wastegates are mechanical devices (specially w/o boost controller and CO2) so they are not an ON/OFF type thing. As you start building exhaust pressure, the wastegate will start to crack open. More so with a really soft spring. Add the fact that the WG 's are way big and it just takes them cracking open just a little bit to bleed off alot of pressure. If he put in the 8 psi spring, I would bet that he would have atleast 1-2 psi by the 4K RPM that he is launching. With this soft a spring, the 2 step will likely only give him 1-2 psi anyways so the answer is boost control + CO2 which will be coming very soon.
The main thing right now is just make sure that everything is working good. The new Holley EFI system is an absolute dream to tune on and the closed loop fueling holds target AFR VERY well all the way thru the passes without much tuning on my part. It also learns on each pass so that it has to make less corrections each time.
Another thing is that everything is setup way conservative. I'm sure that with his current compression and E85 at this boost level, we could be hitting it with 28-30* but it's only got 24* and the AFR is at 11.5 on a gas scale.
Joe's been pretty unlucky for the last couple of years so we are taking it slow and double checking everything to try and change his luck. LOL
As to why there is no boost on the transbrake, He is running 2 44mm wastegates which is way more wastegate than he needs. You gotta remember that wastegates are mechanical devices (specially w/o boost controller and CO2) so they are not an ON/OFF type thing. As you start building exhaust pressure, the wastegate will start to crack open. More so with a really soft spring. Add the fact that the WG 's are way big and it just takes them cracking open just a little bit to bleed off alot of pressure. If he put in the 8 psi spring, I would bet that he would have atleast 1-2 psi by the 4K RPM that he is launching. With this soft a spring, the 2 step will likely only give him 1-2 psi anyways so the answer is boost control + CO2 which will be coming very soon.
The main thing right now is just make sure that everything is working good. The new Holley EFI system is an absolute dream to tune on and the closed loop fueling holds target AFR VERY well all the way thru the passes without much tuning on my part. It also learns on each pass so that it has to make less corrections each time.
Another thing is that everything is setup way conservative. I'm sure that with his current compression and E85 at this boost level, we could be hitting it with 28-30* but it's only got 24* and the AFR is at 11.5 on a gas scale.
Joe's been pretty unlucky for the last couple of years so we are taking it slow and double checking everything to try and change his luck. LOL
those 44mm wastegates are probably bleeding tons of exh pressure.
I wouldnt be at all surprised if you all see way more than 2psi at 4k rpm with the 8psi spring
01-09-2011, 01:50 PM
#285
Your PS breather setup looks nice. May I ask where did you get that from? Also, do you think your trans temp problems were caused by the cooler being to close to the turbo hot pipe? I'm asking because I have mine in back of the radiator too but NOT with a turbo. Is placing the cooler there a bad idea?
01-09-2011, 07:21 PM
#286
Your PS breather setup looks nice. May I ask where did you get that from? Also, do you think your trans temp problems were caused by the cooler being to close to the turbo hot pipe? I'm asking because I have mine in back of the radiator too but NOT with a turbo. Is placing the cooler there a bad idea?
01-09-2011, 11:37 PM
#287
Your PS breather setup looks nice. May I ask where did you get that from? Also, do you think your trans temp problems were caused by the cooler being to close to the turbo hot pipe? I'm asking because I have mine in back of the radiator too but NOT with a turbo. Is placing the cooler there a bad idea?
01-10-2011, 12:01 AM
#288
What fans"factory or aftermarket" you guys use with that set up?
If you don't minde you have the radiator part number from summit?
Man you guys rocks with those turbo set up. I going to fligth in the next few month to know you all in person and those sick rides of yours. My best friend lives in WPB.
If you don't minde you have the radiator part number from summit?
Man you guys rocks with those turbo set up. I going to fligth in the next few month to know you all in person and those sick rides of yours. My best friend lives in WPB.
Last edited by fastsspr; 01-10-2011 at 09:46 PM.
01-13-2011, 09:51 AM
#290
What fans"factory or aftermarket" you guys use with that set up?
If you don't minde you have the radiator part number from summit?
Man you guys rocks with those turbo set up. I going to fligth in the next few month to know you all in person and those sick rides of yours. My best friend lives in WPB.
If you don't minde you have the radiator part number from summit?
Man you guys rocks with those turbo set up. I going to fligth in the next few month to know you all in person and those sick rides of yours. My best friend lives in WPB.
Cool, maybe you can get to the track on a Wednesday or Friday test and tune and catch us out there with one of the cars. PM me when you have your itinerary all figured out.
The fittings on the valve covers are all TIG welded. We are fortunate to have a gifted welder/fabricator in our circle of friends and we each owe him our left nut.
01-30-2011, 08:44 PM
#294
Awesome car and I wish you the best of luck this year.
02-14-2011, 06:44 AM
#297
went to to track yesterday for hotrod sunday got the boost up to a whooping 6.5lbs the car went 9.87 at 137 with a soft 60ft 1.39 very happy going to try and get the boost up to 12lbs 
Car's moving well