Only 10 mpg?
#1
Full Member
Thread Starter
Only 10 mpg?
I have a 87 tii, and I get horrid mpg. I’ll post the mod list, then more detail
New 720cc secondary injectors, new 550 cc primary’s
rtek 1.7
walabro 255
aeromotive fpr at 40 psi
apexi neo running off boost pressure
racing beat rev tii exhaust
stock port, 1400 mile engine
new fuel filter
afr cruising bounces between 14.3-16.
under boost, afr is 10
city driving with boost I get 10 mpg, hwy without touching boost is 17
also I notice I am not using oil which scares me, I haven’t tested to see if the omp is working, but the gas also smells like fuel, I’ll get a taste test soon. Also when starting while hot, I’m pretty sure it floods one of the rotors and makes it so it runs on one until it clears it up.
New 720cc secondary injectors, new 550 cc primary’s
rtek 1.7
walabro 255
aeromotive fpr at 40 psi
apexi neo running off boost pressure
racing beat rev tii exhaust
stock port, 1400 mile engine
new fuel filter
afr cruising bounces between 14.3-16.
under boost, afr is 10
city driving with boost I get 10 mpg, hwy without touching boost is 17
also I notice I am not using oil which scares me, I haven’t tested to see if the omp is working, but the gas also smells like fuel, I’ll get a taste test soon. Also when starting while hot, I’m pretty sure it floods one of the rotors and makes it so it runs on one until it clears it up.
#3
I have a 87 tii, and I get horrid mpg. I’ll post the mod list, then more detail
New 720cc secondary injectors, new 550 cc primary’s
rtek 1.7
walabro 255
aeromotive fpr at 40 psi
apexi neo running off boost pressure
racing beat rev tii exhaust
stock port, 1400 mile engine
new fuel filter
afr cruising bounces between 14.3-16.
under boost, afr is 10
city driving with boost I get 10 mpg, hwy without touching boost is 17
also I notice I am not using oil which scares me, I haven’t tested to see if the omp is working, but the gas also smells like fuel, I’ll get a taste test soon. Also when starting while hot, I’m pretty sure it floods one of the rotors and makes it so it runs on one until it clears it up.
New 720cc secondary injectors, new 550 cc primary’s
rtek 1.7
walabro 255
aeromotive fpr at 40 psi
apexi neo running off boost pressure
racing beat rev tii exhaust
stock port, 1400 mile engine
new fuel filter
afr cruising bounces between 14.3-16.
under boost, afr is 10
city driving with boost I get 10 mpg, hwy without touching boost is 17
also I notice I am not using oil which scares me, I haven’t tested to see if the omp is working, but the gas also smells like fuel, I’ll get a taste test soon. Also when starting while hot, I’m pretty sure it floods one of the rotors and makes it so it runs on one until it clears it up.
Lol fuel economy is not a strong suit with our engines. My 88 NA gets average of 12 mpg. I don't think you have an issue.
Also I would hope your gas smells like fuel...
I assume that since you're concerned about the lack of oil consumption that you still have your OMP. Do you premix?
#4
Full Member
Thread Starter
Welcome to the wonderful world of rotaries!
Lol fuel economy is not a strong suit with our engines. My 88 NA gets average of 12 mpg. I don't think you have an issue.
Also I would hope your gas smells like fuel...
I assume that since you're concerned about the lack of oil consumption that you still have your OMP. Do you premix?
Lol fuel economy is not a strong suit with our engines. My 88 NA gets average of 12 mpg. I don't think you have an issue.
Also I would hope your gas smells like fuel...
I assume that since you're concerned about the lack of oil consumption that you still have your OMP. Do you premix?
#5
Rotary Freak
I can't speak to OPs turbo, but your NA should absolutely be getting more than 12 MPG. Unless you're always at WOT and shifting at 7k. I get 20-26 in a tank of normal driving + a few spirited drives.
#7
Rotary Enthusiast
iTrader: (23)
Your oil may be going through the omp and functioning properly. The fuel in oil is probably mainly from blow by.
I’ve noticed this on my car as I do not run the omp, my oil will smell of fuel, and the oil level rises. My car is now mainly track only and sees 5k+ rpm most it’s lifetime.
I used to daily my t2, and when people ask me what the gas mileage in my rx7 is, I just tell them I put gas in it when it gets low so I can’t comment on mpg.
I’ve noticed this on my car as I do not run the omp, my oil will smell of fuel, and the oil level rises. My car is now mainly track only and sees 5k+ rpm most it’s lifetime.
I used to daily my t2, and when people ask me what the gas mileage in my rx7 is, I just tell them I put gas in it when it gets low so I can’t comment on mpg.
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#8
Rotary Enthusiast
You should be getting better gas mileage than that. How's your TPS?
I just came back from a 3-day road trip to the Shenandoah region of VA (Harrisonburg) for fly fishing school. It was about 135 miles one-way from the DC area. Initial fill was mixed interstate and city, and final fill was straight interstate. On both fills, I filled until the gas overflowed the filler tube. I had the cruise set at 70 mph for most of the interstate drive. I've got 18.1 mpg on the first fill and 28.3 mpg on the second fill. I've got mainly stock S5 non-turbo with RB catback and high flow cat with a 4.3 rear end with 0.756 (GTUs) 5th gear.
I just came back from a 3-day road trip to the Shenandoah region of VA (Harrisonburg) for fly fishing school. It was about 135 miles one-way from the DC area. Initial fill was mixed interstate and city, and final fill was straight interstate. On both fills, I filled until the gas overflowed the filler tube. I had the cruise set at 70 mph for most of the interstate drive. I've got 18.1 mpg on the first fill and 28.3 mpg on the second fill. I've got mainly stock S5 non-turbo with RB catback and high flow cat with a 4.3 rear end with 0.756 (GTUs) 5th gear.
#9
Rotisserie Engine
iTrader: (8)
unless youre driving in boost all the time it should be getting much better. If I drove my NA like a normal person I averaged 17-18MPG and I was able to hypermile the NA up to 27mpg. (confirmed 24mpg with traffic going back the opposite from the trip)
Keep the RPMs down, dont listen to the youtube hype of always being over 3-4k rpm. I usually put around town shifting at 3 and letting it cruise around at 2200-2700. I obviously shift if it gets bogged down from a hill.
Keep the RPMs down, dont listen to the youtube hype of always being over 3-4k rpm. I usually put around town shifting at 3 and letting it cruise around at 2200-2700. I obviously shift if it gets bogged down from a hill.
The following users liked this post:
Relisys190 (06-16-22)
#10
Moderator
iTrader: (3)
both of you guys (Stussy and Cardinell) have issues if those numbers are under normal driving conditions.
this is more a thought than advice because i don't fully know the ins and outs of the Rtek and how it works. i'm under the impression that it's adjustable, so my question is have you re-adjusted it since the rebuild?
this is more a thought than advice because i don't fully know the ins and outs of the Rtek and how it works. i'm under the impression that it's adjustable, so my question is have you re-adjusted it since the rebuild?
#11
Full Member
Thread Starter
both of you guys (Stussy and Cardinell) have issues if those numbers are under normal driving conditions.
this is more a thought than advice because i don't fully know the ins and outs of the Rtek and how it works. i'm under the impression that it's adjustable, so my question is have you re-adjusted it since the rebuild?
this is more a thought than advice because i don't fully know the ins and outs of the Rtek and how it works. i'm under the impression that it's adjustable, so my question is have you re-adjusted it since the rebuild?
#12
REINCARNATED
iTrader: (4)
I am getting around 16-17 on E85 when not in boost. S5 6 port Turbo on a Haltech. When I'm running 93 octane I can get 22mpg on the highway. I would certainly look into a tune up for your cars.
-M
-M
#14
Full Member
Thread Starter
#15
Rotisserie Engine
iTrader: (8)
its been a long time but there is a green connector on the harness i believe you can jump it out to lock the timing...
https://www.rx7club.com/new-member-r...timing-879097/
https://www.rx7club.com/new-member-r...timing-879097/
#16
Full Member
Thread Starter
its been a long time but there is a green connector on the harness i believe you can jump it out to lock the timing...
https://www.rx7club.com/new-member-r...timing-879097/
https://www.rx7club.com/new-member-r...timing-879097/
#17
Rotary Enthusiast
Not exactly sure what you're asking, but grounding the green 1-pin connector (which is next to the battery box) disables the BAC. With the BAC is disabled, you'll get the lowest idle. Also, turn-off any accessories.
#18
Rotary Freak
It's the two pin green connector by the leading coils. The FSM calls this the "initial set connector" and it's used to set idle speed, timing, mixture, etc.
You can use a paperclip as a jumper. Just remember to remove it after you're done, or timing will be locked at base.
You can use a paperclip as a jumper. Just remember to remove it after you're done, or timing will be locked at base.
#19
Rotary Enthusiast
It's the two pin green connector by the leading coils. The FSM calls this the "initial set connector" and it's used to set idle speed, timing, mixture, etc.
You can use a paperclip as a jumper. Just remember to remove it after you're done, or timing will be locked at base.
You can use a paperclip as a jumper. Just remember to remove it after you're done, or timing will be locked at base.
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