Help with Bosch 1600cc Idle
Well, you will never get rid of the sloppiness down low but you will make it more manageable with lower fuel pressure. Also depending on your 3 bar map sensor it may not be reading your vacuum very accurately which is also going to make idle and decel fueling "fun". That's why I like the DPE corvettes 2.5 bar map sensor as it's accurate all over and most people don't need more than 2.5 bar of measurement.
seems like evry time asks what injectors, the vendors are real quick to try and sell. But when people are just solving problems, the herd thins out a lot.
Now where is that video I posted, that a vendor had removed? It was a you tube video showing spray patterns on a high speed camera. It seems the moderator that removed it and said I was pushing some injector might have a bias? Cause just seeing it, in this case, definately could have avoided this thread entirely.
Good luck with the idle......I went another way but Im not allowed to tell you.
Now where is that video I posted, that a vendor had removed? It was a you tube video showing spray patterns on a high speed camera. It seems the moderator that removed it and said I was pushing some injector might have a bias? Cause just seeing it, in this case, definately could have avoided this thread entirely.
Good luck with the idle......I went another way but Im not allowed to tell you.
Thread Starter
Joined: Nov 2004
Posts: 1,273
Likes: 3
From: Rochester, NY
The injectors are 846. The map is a 3 bar "GM1222xxxx" but I'm not positive on who makes it. I'd like to get a new map but I find so much differing information on them that I can't figure out if I'd be better or worse off.
FYI, I'm planning on maxing out this turbo on my setup, which should be around 20psi I'm thinking on this setup.
FYI, I'm planning on maxing out this turbo on my setup, which should be around 20psi I'm thinking on this setup.
Thread Starter
Joined: Nov 2004
Posts: 1,273
Likes: 3
From: Rochester, NY
Oh and my email is bigadam@rochester.rr.com
When going from 4 bar to 3 bar, are you just adjusting the injector tables?
When going from 4 bar to 3 bar, are you just adjusting the injector tables?
The injectors are 846. The map is a 3 bar "GM1222xxxx" but I'm not positive on who makes it. I'd like to get a new map but I find so much differing information on them that I can't figure out if I'd be better or worse off.
FYI, I'm planning on maxing out this turbo on my setup, which should be around 20psi I'm thinking on this setup.
FYI, I'm planning on maxing out this turbo on my setup, which should be around 20psi I'm thinking on this setup.
Those injectors are the old Ford 160s with the light grey (white) top correct? Those are pretty nasty down low with some funky characteristics but still tuneable.
Oh and my email is bigadam@rochester.rr.com
When going from 4 bar to 3 bar, are you just adjusting the injector tables?
When going from 4 bar to 3 bar, are you just adjusting the injector tables?
Last edited by NicD; Aug 30, 2011 at 08:35 PM.
Thread Starter
Joined: Nov 2004
Posts: 1,273
Likes: 3
From: Rochester, NY
Yes, it is the rectangular block looking type. If I switch to the 2.5 bar map, will that affect the OS that I'm running at all? Or just plug in new map and off I go?
The injectors are indeed the whiteish top "Bosch" or "Ford" type.
From looking at logs, looks like she idles in the 40kpa range.
The injectors are indeed the whiteish top "Bosch" or "Ford" type.
From looking at logs, looks like she idles in the 40kpa range.
Yes, it is the rectangular block looking type. If I switch to the 2.5 bar map, will that affect the OS that I'm running at all? Or just plug in new map and off I go?
The injectors are indeed the whiteish top "Bosch" or "Ford" type.
From looking at logs, looks like she idles in the 40kpa range.
The injectors are indeed the whiteish top "Bosch" or "Ford" type.
From looking at logs, looks like she idles in the 40kpa range.
OK on the injectors, I have data for those for aftermarket computers but it's fairly straight forward to convert to LS1 PCM format. I'll work on that shortly...
Idling around 40 kpa is what I was afraid of, you are at the mercy of that old MAP sensor at this point and if you want more driveability and accuracy you will need that newer sensor.
Thread Starter
Joined: Nov 2004
Posts: 1,273
Likes: 3
From: Rochester, NY
I looked up that map. Looks to be very linear from 20-250kpa. Is this an off the shelf GM sensor or does DPE do something special to it? It's a little pricey but if it's all you say it is, it's probably worth it.
I appreciate the help. I just got a base tune on our RX7 project as well, so I can use what I learn here with that. It's a 5.3 with a GT2-3, good springs, LS9 gaskets, ARP hardware and a 7875 as well. It's scary already on 8lbs. Also on E85, the 60lb injectors on that are already done though. Will probably tune that one in on the dyno now at the current boost and leave it until my buddy learns how to drive it, haha.
I appreciate the help. I just got a base tune on our RX7 project as well, so I can use what I learn here with that. It's a 5.3 with a GT2-3, good springs, LS9 gaskets, ARP hardware and a 7875 as well. It's scary already on 8lbs. Also on E85, the 60lb injectors on that are already done though. Will probably tune that one in on the dyno now at the current boost and leave it until my buddy learns how to drive it, haha.
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Verdad Gallardo It's a different sensor that is transplanted into the factory housing so it's a direct bolt on type of deal. It's definitely worth it when dealing with the wide range that you have.
It's the Motorola MPX4250AP I believe but it's the part number without the "body" so it fits better inside the OEM map sensor case. The sensors themselves are cheap, it's the labor to integrate it into the factory casing that makes it expensive.
Thread Starter
Joined: Nov 2004
Posts: 1,273
Likes: 3
From: Rochester, NY
I might just order the $13 sensor and give it a shot. Nothing a soldering gun can't take care of. Looks like I would just need the ground, VCC and vout. My stock MAP is still in the stock location and it's hard for me to swap with the intake on. I keep it installed because I plug it and the MAF in and flash a different tune for inspection.
Thread Starter
Joined: Nov 2004
Posts: 1,273
Likes: 3
From: Rochester, NY
So we ordered 3 of these sensors a while back. I finally wired one into the RX7 today. Man does it run better! Just swapping the sensor itself and reflashing for the different offset and slope made a HUGE difference. Did some fine tuning after that, so much better now. Definitely will be doing the GTO in the spring.
