Sluggish after JDM tune
10-02-2014, 08:55 PM
#11
Member
Thread Starter
10-02-2014, 09:08 PM
#12
Hmm? I I have reloaded my tune 3 times and did a KAM (keep alive memory) reset and it did seem to help stabilize my idle which seemed a little high. But it's the cold start lag that I keep hearing is normal.. Now I can live with a very slight lag, but I just want the lag to be minimal enough so I can use my remote start without having to wait and see if she fires up on the first try.. If she doesn't fire up on the first attempt, the second attempt the motor always fires up in a hurry.. This is why I swear it might have something to do with cold start oil pressure, or both..
10-02-2014, 09:14 PM
#13
Member
Thread Starter
Me.
"Another thing I wanted to ask about is the cold startup. It kinda stumbles then revs to 2,500 rpms for like 8 seconds then drops down to the normal high idle of 1,000 rpms."
Julie
"Oh ok. It does do that.. that is a hit or miss with our tunes. I will let him know that too"
"Another thing I wanted to ask about is the cold startup. It kinda stumbles then revs to 2,500 rpms for like 8 seconds then drops down to the normal high idle of 1,000 rpms."
Julie
"Oh ok. It does do that.. that is a hit or miss with our tunes. I will let him know that too"
10-02-2014, 09:31 PM
#14
Me. "Another thing I wanted to ask about is the cold startup. It kinda stumbles then revs to 2,500 rpms for like 8 seconds then drops down to the normal high idle of 1,000 rpms." Julie "Oh ok. It does do that.. that is a hit or miss with our tunes. I will let him know that too"
Lol!
I suppose it really is a finicky thing to dial in.. It prob has something to do with the way they wrote the file for injector sizes. I'd be willing to bet that the tunes they write that account for 39# injectors (a more common injector) are probably more "dialed in" then other injector sizes.. I chose 47# injectors which is an injector that leaves room for me to grow to over 10psi of boost with no worries. It's not as common as 39# or 60# injectors, so whatever tables they are using to scale the injectors with are only going to get so close..
What size injectors are you running?
My buddy with ID 1000 injectors in his Honda had a hell of a time getting them dialed in for cold starts. But he was using a Hondata S200 for his tuning platform. Hondata makes our Edge and SCT equipment look like an old tiger electronics handheld video game.. So by "hell of a time" I mean it took him about 1 hour to fix LOL!
SCT does have some nice software that I'm going to be buying, so of all of our choices SCT is the best we got... I've still got to get a datalog over to JDM to hopefully fix my cold start issue.
Last edited by Especial86; 10-02-2014 at 09:33 PM.
10-02-2014, 10:34 PM
#16
12 Second Truck
How many miles on the HT0 plugs and how many miles on the front 02 sensors? Also have you cleaned the throttle body, maf sensor, replaced the fuel filter, and verified the throttle body is opening 100%?
10-02-2014, 11:13 PM
#17
Member
Thread Starter
About 5k on the plugs, I change them every 25,000. I haven't changed the 02's since I've owned it so at least 60,000 miles, probably time but it ran fine with the roush tune. I've never had it on a dyno so the only thing I have as a reference is 0-60 and 1/4 mile times. With the roush tune I'd run consistent 0-60 in 6.9 and 1/4 mile in 15. From what I've read that's normal for a roushcharged super crew 4x4. Recently cleaned the throttle body and maf, and yes I used maf cleaner on the maf, not tb cleaner. Fuel filter about 15,000 miles ago, and no I haven't checked the throttle plate...how do you check that?
10-03-2014, 12:27 AM
#18
Member
Thread Starter
So I found a document that says the roush kit comes with 38# injectors, I put 39# on my tune sheet. The only numbers on the injectors don't pull up anything. Would thus cause my issue?
10-03-2014, 07:28 AM
#19
12 Second Truck
[QUOTE='06Roush_150;3736140]So I found a document that says the roush kit comes with 38# injectors, I put 39# on my tune sheet. The only numbers on the injectors don't pull up anything. Would thus cause my issue?
/QUOTE]
That's odd. The Roush kits came with 42lb injectors. They were green and made by Bosch. Never heard of the 38lb. Fords injectors are 19, 24, 30, 39, 42, 47, 60 and so on. The 39lb injectors are blue and often reffered to as Cobra injectors as they were produced for the 03-04 Cobra.
As for the throttle plate. You can use the SCT data log and should see throttle postion at 100-110%. The easiest sure fire way to know is to disconnect your intake from the throttle body, turn the key to on but don't start the truck, have someone press the gas to the floor while you watch the throttle plate.
I think your issue is in the tune. However it never hurts to check everything else.
/QUOTE]
That's odd. The Roush kits came with 42lb injectors. They were green and made by Bosch. Never heard of the 38lb. Fords injectors are 19, 24, 30, 39, 42, 47, 60 and so on. The 39lb injectors are blue and often reffered to as Cobra injectors as they were produced for the 03-04 Cobra.
As for the throttle plate. You can use the SCT data log and should see throttle postion at 100-110%. The easiest sure fire way to know is to disconnect your intake from the throttle body, turn the key to on but don't start the truck, have someone press the gas to the floor while you watch the throttle plate.
I think your issue is in the tune. However it never hurts to check everything else.
10-03-2014, 07:48 AM
#20
Member
Thread Starter
[QUOTE=Blown Ford;3736289]
They have a roush part number, R07110002 this is in the manual. The only markings on the injector are what you can see in the picture.
So I found a document that says the roush kit comes with 38# injectors, I put 39# on my tune sheet. The only numbers on the injectors don't pull up anything. Would thus cause my issue?
/QUOTE]
That's odd. The Roush kits came with 42lb injectors. They were green and made by Bosch. Never heard of the 38lb. .
/QUOTE]
That's odd. The Roush kits came with 42lb injectors. They were green and made by Bosch. Never heard of the 38lb. .