anyone running zero split timing n/a engine?
#1
Concept Motorsports
Thread Starter
anyone running zero split timing n/a engine?
now that we have a n/a section
who is running 0 degrees of ignition split on there n/a engines either efi or carb.
who is running 0 degrees of ignition split on there n/a engines either efi or carb.
#6
Apprentice Tech.
iTrader: (5)
Join Date: Nov 2005
Location: Marysville, Wa
Posts: 484
Likes: 0
Received 0 Likes
on
0 Posts
I dont understand anything much about timing, but i wanna change it. Im sure its stock because its a little rich (thats normal right?) do i advance or retard the timing? and can someone PLEASE help me with my vacuum?
Trending Topics
#11
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 30,832
Received 2,603 Likes
on
1,847 Posts
that is one consideration
the rx8's timing map goes from negative split @idle and low load to a very low split in light to medium split situations to running about 10 degrees of split @wot
also to be considered is cross fire, if you fire em all at once, then cross fire cant hurt.
the rx8's timing map goes from negative split @idle and low load to a very low split in light to medium split situations to running about 10 degrees of split @wot
also to be considered is cross fire, if you fire em all at once, then cross fire cant hurt.
#12
Concept Motorsports
Thread Starter
what plugs are you using?
#13
Old [Sch|F]ool
One MSD box, two coils through the distributor.
Why? Too cheap for two boxes and I *want* a functional rev limiter.
Downside is that fuel economy suffers a little. (25ish MPG instead of 27-30)
#15
Old [Sch|F]ool
There is no reason to be getting fuel economy that horrible unless your tuning is way off (not enough low load advance/running full power fuel mixtures in the low load region) or you're just driving like an animal.
There used to be some FD guys in Columbus who'd get 30mpg in their turbo cars, your higher compression setup has no excuse.
There used to be some FD guys in Columbus who'd get 30mpg in their turbo cars, your higher compression setup has no excuse.
#17
Rotary Enthusiast
iTrader: (1)
Join Date: Oct 2005
Location: Raleigh, NC
Posts: 1,017
Likes: 0
Received 0 Likes
on
0 Posts
i get 20 on the highway, 14-15 in the street. It might have something to do with a large streetport and Aux bridge, but I could be wrong.
As for selling your rx7 because of gas mileage: If you get 20 mpg with the Rx7 and drive same 90 miles a day, versus getting 30 mpg and driving 90 miles per day you are talking about 3 gallons vs 4.5 gallons. That $5 a day, roughly. Multiplied by 30 days a month your new car payment would have to be less than $150 a month for it to make financial since, assuming you dont have a car payment on the RX7, which most of us dont. If you do have a car payment then you would have to figure that into your costs. If your payment is $100 ($3k financed over 3 years) a month then your new car payment would have to be under $250 a month before selling your RX7 would make save you anything.
BC
As for selling your rx7 because of gas mileage: If you get 20 mpg with the Rx7 and drive same 90 miles a day, versus getting 30 mpg and driving 90 miles per day you are talking about 3 gallons vs 4.5 gallons. That $5 a day, roughly. Multiplied by 30 days a month your new car payment would have to be less than $150 a month for it to make financial since, assuming you dont have a car payment on the RX7, which most of us dont. If you do have a car payment then you would have to figure that into your costs. If your payment is $100 ($3k financed over 3 years) a month then your new car payment would have to be under $250 a month before selling your RX7 would make save you anything.
BC
#18
Back at it again!!
iTrader: (3)
Join Date: Jun 2003
Location: Western Colorado
Posts: 1,324
Likes: 0
Received 0 Likes
on
0 Posts
Under WOT, I'm at 13:1 afr. During cruising, I'm anywhere from 14 - 16 afr depending upon where I'm at in vacuum. I'm only getting 15mpg when I really baby it and try and keep from going past 3500 rpms and 50% throttle. Overall, I still seem to maintain my usual 11 - 12 mpg. My typical driving habit consists of shifting at 3 - 5k at 35 - 75% throttle. I checked my compression and I'm still getting 90 psi all around (give or take 1 or 2 psi). My ignition map is pretty decent and I'll try and put up a pic or a link. I got to drive my brother's 03 celica for a week while he was in Alaska and being able to get 30 - 35 mpg made me quite jealous. 150 miles in his car cost me around $15, whereas 120 miles in my 7 cost me around $39.
#19
Rotary Enthusiast
iTrader: (1)
Join Date: Oct 2005
Location: Raleigh, NC
Posts: 1,017
Likes: 0
Received 0 Likes
on
0 Posts
It REALLY sounds like you need a tune up man. Try new plugs, wires, fuel filter and have the injectors cleaned. May only net you a few mpg, but 11-15 is pretty bad. I get a 15 city pretty easily. I dont see anywhere near 11 unless I beat the **** out of the engine.
Worst I ever got was a touch under 8 mpg up at The Dragon last April.
BC
Worst I ever got was a touch under 8 mpg up at The Dragon last April.
BC
#20
Back at it again!!
iTrader: (3)
Join Date: Jun 2003
Location: Western Colorado
Posts: 1,324
Likes: 0
Received 0 Likes
on
0 Posts
have new plugs (bur9eqp), have new wires, a new fuel filter, a mallory hyfire, and my 550 and 680's were professionally cleaned before I put them in about 800 miles ago.
I've been thinking about it today and maybe my fuel enrichment settings are too rich during warmup. Most of the time, it doesn't reach full operating temp (about 160) until I reach my destination which is usually within 10 miles. It takes alot longer to reach that temp because it's been soo friggin cold in PA. Even at that, when it is warmed up, I see 15mpg at best.
I've been thinking about it today and maybe my fuel enrichment settings are too rich during warmup. Most of the time, it doesn't reach full operating temp (about 160) until I reach my destination which is usually within 10 miles. It takes alot longer to reach that temp because it's been soo friggin cold in PA. Even at that, when it is warmed up, I see 15mpg at best.
#21
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 30,832
Received 2,603 Likes
on
1,847 Posts
i get 20 on the highway, 14-15 in the street. It might have something to do with a large streetport and Aux bridge, but I could be wrong.
As for selling your rx7 because of gas mileage: If you get 20 mpg with the Rx7 and drive same 90 miles a day, versus getting 30 mpg and driving 90 miles per day you are talking about 3 gallons vs 4.5 gallons. That $5 a day, roughly. Multiplied by 30 days a month your new car payment would have to be less than $150 a month for it to make financial since, assuming you dont have a car payment on the RX7, which most of us dont. If you do have a car payment then you would have to figure that into your costs. If your payment is $100 ($3k financed over 3 years) a month then your new car payment would have to be under $250 a month before selling your RX7 would make save you anything.
BC
As for selling your rx7 because of gas mileage: If you get 20 mpg with the Rx7 and drive same 90 miles a day, versus getting 30 mpg and driving 90 miles per day you are talking about 3 gallons vs 4.5 gallons. That $5 a day, roughly. Multiplied by 30 days a month your new car payment would have to be less than $150 a month for it to make financial since, assuming you dont have a car payment on the RX7, which most of us dont. If you do have a car payment then you would have to figure that into your costs. If your payment is $100 ($3k financed over 3 years) a month then your new car payment would have to be under $250 a month before selling your RX7 would make save you anything.
BC
#22
Where is my Life ?
iTrader: (2)
Join Date: Nov 2003
Location: ottawa canada
Posts: 2,175
Likes: 0
Received 0 Likes
on
0 Posts
back on topic.
I tried 6 split and got the WOT to 13.1 then lowered the split to 2 degrees ( would of tried zero split, but with the haltech didnt want to take a chance and it negative spliting at WOT ). and noticed I needed to add more fuel to get back to 13.1 . So assuming more fuel to make the same afr means its making a litte more power.
Never went to dyno, but im going to assume at wot smaller split will yield better power.
System: haltech e6k egt was aprox. 1350-1380 If i remembe correctly ( but this can be off).
I tried 6 split and got the WOT to 13.1 then lowered the split to 2 degrees ( would of tried zero split, but with the haltech didnt want to take a chance and it negative spliting at WOT ). and noticed I needed to add more fuel to get back to 13.1 . So assuming more fuel to make the same afr means its making a litte more power.
Never went to dyno, but im going to assume at wot smaller split will yield better power.
System: haltech e6k egt was aprox. 1350-1380 If i remembe correctly ( but this can be off).
#23
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 30,832
Received 2,603 Likes
on
1,847 Posts
back on topic.
I tried 6 split and got the WOT to 13.1 then lowered the split to 2 degrees ( would of tried zero split, but with the haltech didnt want to take a chance and it negative spliting at WOT ). and noticed I needed to add more fuel to get back to 13.1 . So assuming more fuel to make the same afr means its making a litte more power.
Never went to dyno, but im going to assume at wot smaller split will yield better power.
System: haltech e6k egt was aprox. 1350-1380 If i remembe correctly ( but this can be off).
I tried 6 split and got the WOT to 13.1 then lowered the split to 2 degrees ( would of tried zero split, but with the haltech didnt want to take a chance and it negative spliting at WOT ). and noticed I needed to add more fuel to get back to 13.1 . So assuming more fuel to make the same afr means its making a litte more power.
Never went to dyno, but im going to assume at wot smaller split will yield better power.
System: haltech e6k egt was aprox. 1350-1380 If i remembe correctly ( but this can be off).
https://www.rx7club.com/showpost.php...8&postcount=79
#25
Old [Sch|F]ool