Street Port MPG?
#4
Part-time Sancho
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I've only placed 260 miles on my newly done streetport. Still have approx a quarter tank of gas left. Before the build I averaged 14mpg. I would get about 200miles being heavy on the gas and and about 250 being light. So this is a little change. As what has been said before you still won't get great fuel economy with a 7.
#5
Rotary Enthusiast
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oh, guess I should also state Im running the stock ECU, injectors also, but a Walbro 255 pump.
#6
Black Beast
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That wasnt a very constructive comment about the VW turbodiesel. Im aware 7's dont get great mileage but with this car being my daily driver I cant afford it being much lower than 17mpg on average. So basically is it going to get worse or better? I was thinking on one hand more hp needs more fuel on the other more flow means engine doesnt have to work as hard. I dunno.
#7
That wasnt a very constructive comment about the VW turbodiesel. Im aware 7's dont get great mileage but with this car being my daily driver I cant afford it being much lower than 17mpg on average. So basically is it going to get worse or better? I was thinking on one hand more hp needs more fuel on the other more flow means engine doesnt have to work as hard. I dunno.
...as well, driving habbits will greatly influence fuel economy (i.e. keeping it below 2500RPM and no boost).
My Turbo II gets horrible fuel mileage, for a daily driver... so I have a Volvo 850 Turbo. My best reccomendation would be to look in to another vehicle as soon as possible; keeping the 7 for 'fun'.
Back to your original post, I can't imagine getting better fuel economy from altering the car with a performance-based port... but to be fair, I'm new enough to not be very confident with rotaries and porting (i.e. wich benefits each port job would yield).
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#8
pwned
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it really comes down to quality of the port and tuning. and an rx7 CAN get 30 mpg. **** my 12a first gen got me 32mpg with a leaky exhaust. dont let people stear you in the wrong direction.
#10
Parts collector
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Oh really? Cuz my aggressively streetported TII gets 26 mpg with a shitty tune on the highway. oh an i should state that i have a fairly unrestricted 3" exhaust, 720/1680 injectors and a 9lbs flywheel.
it really comes down to quality of the port and tuning. and an rx7 CAN get 30 mpg. **** my 12a first gen got me 32mpg with a leaky exhaust. dont let people stear you in the wrong direction.
it really comes down to quality of the port and tuning. and an rx7 CAN get 30 mpg. **** my 12a first gen got me 32mpg with a leaky exhaust. dont let people stear you in the wrong direction.
#11
#14
The noob who could
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You should also think about getting a wideband o2 sensor and some kind of fuel management device. That won't only help your mpg but a porting doesn't do what it's supposed to until you have control over your fuel ratio.
I spose you didn't ask for opinions but I wouldn't pay for a port on an N/A. So unless you are planning to diy, in which case thats fine, I would save for a T2 swap since that'll satisfy you more in the long run. (reading previous posts it seems you are at a rebuild point)
I spose you didn't ask for opinions but I wouldn't pay for a port on an N/A. So unless you are planning to diy, in which case thats fine, I would save for a T2 swap since that'll satisfy you more in the long run. (reading previous posts it seems you are at a rebuild point)
#16
Black Beast
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I spose you didn't ask for opinions but I wouldn't pay for a port on an N/A. So unless you are planning to diy, in which case thats fine, I would save for a T2 swap since that'll satisfy you more in the long run. (reading previous posts it seems you are at a rebuild point)
Okay so Ive got responses ranging from 26 mpg to 13. If I average those numbers Id be very content. Do the turbos get better or worse mileage in general?
#17
Rotary Enthusiast
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Bascially Im trying to get to the 200whp number. I saw dyno numbers from an 88 n/a with aggressive street port done at Banzai Racing and it hit 188 without fuel management. Im hoping with the same port and an afc neo i can get to at least 195whp.
Okay so Ive got responses ranging from 26 mpg to 13. If I average those numbers Id be very content. Do the turbos get better or worse mileage in general?
Okay so Ive got responses ranging from 26 mpg to 13. If I average those numbers Id be very content. Do the turbos get better or worse mileage in general?
please prove me wrong, i'd love to see it ~not being sarcastic~
in theory, turbos should get better efficiency but ti's so damn hard to keep off boost, it's addicting!
#18
196whp with a modded, stock S4 intake manifold.
Say no to misinformation!
#19
Engine, Not Motor
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Any reasonable street port will have little effect on mileage. Depending on how it is ported (mainly on the exhaust side) it may get better mileage, may get worse. Though one thing to remember is that your driving style is likely different from the driving style I would use to measure mileage. If you are heavy on the throttle, mileage is going to be poor either way.
And if you want to split hairs, a VW turbo diesel gets poor economy as well. My other car is a Honda Insight.
I spose you didn't ask for opinions but I wouldn't pay for a port on an N/A. So unless you are planning to diy, in which case thats fine, I would save for a T2 swap since that'll satisfy you more in the long run. (reading previous posts it seems you are at a rebuild point)
Not everyone wants a TII swap, and there's something to be said about a nice fresh NA engine compared to a junk yard TII drivetrain.
[QUOTE=need-a-t2;8878711]I hate to break your bubble, but your not going to get 195RWHP on a streetported N/A motor. bridgport probably, maybe even a half bridge. 7RWHP is alot to gain on an N/A, and I don't thing a AFC will cut it.
please prove me wrong, i'd love to see it ~not being sarcastic~
Easily done on a half bridge with a proper manifold setup. But I agree, it's going to be difficult to get 200 wheel HP on an NA setup without radical modifications. Few achieve this.
#20
200WHP would be nice, but I'll give you some advice, as a DynoJet certified operator; don't set your mind on the 200 number. Instead, mod the engine how you think will best suit your expectations and requirements (decent power and fuel economy). The Dyno is really a tool for tuning air/fuel ratio, and any numbers/bragging rights you get should just be a bonus. Along that train of thought, Dyno numbers can vary greatly from Dyno to Dyno, so only compare numbers with people who ran the same Dyno with similar conditions (temp, humidity, operator, etc...). You still can't be 100% with these things in mind. Operators can alter numbers, or cheat the numbers. There's a certain 'guideline' for an honest-tune, and making passes doing different things can better or worsen your results.
Food for thought
#22
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I am getting 14 city, 25 mpg Hwy on an 88 TII.
Set up is a hybrid engine.
Street port turbo center plate, Street port 6 port end plates, Street ported housings.
9.4 NA rotors
Hogged S5 Turbo intake, stock IC
TII ECU, stock 550cc injectors, Aeromotive AFPR @45 PSI
Hybrid S5 turbo, ported WG, 9 PSI
HKS FCD
AFR stays below 11.7 all the way to 7.5k RPM
Cruise AFR is 14.5-14.9
Stock DP (hollowed cat), Corksport 3" exhaust
256 RWHP
Point being you can get decent MPG's with modified engines.
Set up is a hybrid engine.
Street port turbo center plate, Street port 6 port end plates, Street ported housings.
9.4 NA rotors
Hogged S5 Turbo intake, stock IC
TII ECU, stock 550cc injectors, Aeromotive AFPR @45 PSI
Hybrid S5 turbo, ported WG, 9 PSI
HKS FCD
AFR stays below 11.7 all the way to 7.5k RPM
Cruise AFR is 14.5-14.9
Stock DP (hollowed cat), Corksport 3" exhaust
256 RWHP
Point being you can get decent MPG's with modified engines.
Last edited by 2_3D_SC; 01-14-09 at 08:28 PM. Reason: added street ported
#23
Rotary Enthusiast
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https://www.rx7club.com/showthread.p...highlight=dyno
196whp with a modded, stock S4 intake manifold.
Say no to misinformation!
196whp with a modded, stock S4 intake manifold.
Say no to misinformation!
#24
KM48 Burnout
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You guys need to keep wishing you get over 30MPG. The rotary is not an efficient motor. You'd be so lucky to see 20. Just enjoy the car and beat on it. Don't worry about MPGs.
#25
I
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