2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
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Old 12-05-07, 05:43 PM
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Originally Posted by classicauto
My bridgeport got 19mpg on the highway. You're setup has some issues.

EDIT: FWIW, a 1998 Dodge Viper GTS has an EPA city mileage of 9.5mpg. Again - something's wrong with your setup.

i thought that to... but i still think im goin to go with a street port i would be nice to have it an if i was wanting to do a bp i could always tear it down an use 3mm seals insted of the rotory avation super seals 2mm so for now i think ill go with the street port an see how i like it an then if i want more bridge port later down the road
Old 12-05-07, 05:45 PM
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Don't get me wrong, I'm not advising you DO BP it. I'm just saying that neither a street or bridge should get that kind of highway mileage.....city, thats another story.

I've had both and my current motor is getting a medium streetport. Trying a different route yet again
Old 12-05-07, 05:50 PM
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Originally Posted by classicauto
My bridgeport got 19mpg on the highway. You're setup has some issues.

EDIT: FWIW, a 1998 Dodge Viper GTS has an EPA city mileage of 9.5mpg. Again - something's wrong with your setup....
How does your BRIDGEPORT rotary motor get better mileage then the RENESIS? There's nothing wrong with my setup. It sounds like you have a math problem.
Old 12-05-07, 06:49 PM
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Originally Posted by gabs88gxl
yea i read that now lol... but yea i dont know i still want to but i dont know i wanna get a street port but i want the extra i want the sound an the power i love the bp sound so i dont know
It's very difficult to understand what you are saying when you make no effort to use proper sentences. I'm not quite sure what you are trying to communicate but I'll try my best to answer.

It is pointless to bridgeport the engine unless you want to make more then 400 wheel HP. In my opinion, all the turbos that are capable of making big numbers are far too laggy without a bridgeport. The trade off is the fact that mileage at low RPMs absolutely sucks (less then 10 MPG in the city...), the car idles poorly, and it's much more difficult to tune. Personally I like the idle and I've accepted the mileage hit but if you don't have a valid reason to bridgeport, then don't do it just because it's "cool".

To make 400HP, you could get away with stock ports easily. Stock ports and a GT35R will make that kind of power with very little lag.

Originally Posted by rx7fc3s87
Put it this way, my street ported series 5 naturally aspirated motor got 15 miles per gallon ON THE FREEWAY! 7-9mpg city driving... A bridge port is only going to be worse. I'd go with a street port.
There is something wrong with your car. My bridgeported engine gets mileage in the mid 20s on the highway, and about 10 MPG in the city.

Originally Posted by gabs88gxl
yea true but still i dont know i might just go with a streetport but i want something more that 340hp not on a stop motor cause im not goin to rebuld it agian for over boosting an i know the way i drive that wouldnt last a month before i would have gto rebuild when i think about it bo is the betterway to go if i was juust making a track car im making a daily drvin car so street port would probly go better
OK, so now you want more then 340HP?

Again, it's hard to understand but I think you are trying to say that if you don't rebuild the engine you will blow it? As long as the engine is in good shape and it's tuned properly running more boost won't be an issue. At sub 400HP levels, the 13B is very reliable.

Originally Posted by gabs88gxl
**** welli think im just going to do a street port then....lol i know the way i drive if i had that much power i would **** it up some how hahaha... i would either blow a side seal or a apex seal lol... so i think that street port would be a better way for my driving habits
It's almost impossible to blow a side seal, and driving habits will have very little to do with blowing an engine if it's tuned correctly.

The more you post, the more random your statements become. It may be the time to stop throwing around terms and simply sit back and read this forum for a while. A lot of knowledge goes by and it will give you a good starting point so you can make intelligent decisions.

Originally Posted by gabs88gxl
i thought that to... but i still think im goin to go with a street port i would be nice to have it an if i was wanting to do a bp i could always tear it down an use 3mm seals insted of the rotory avation super seals 2mm so for now i think ill go with the street port an see how i like it an then if i want more bridge port later down the road
3MM seals are only to be used if your rotors are too worn to accept 2MM seals. 3MM seals don't seal as well as 2MM, and won't really offer more resistance to detonation.
Old 12-05-07, 07:12 PM
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There are so many things that account for gas mileage. To say there is something wrong with my "setup" is hillarious. I guess 245/40/17, 275/40/17, turbo injectors, and the gp-sports body kit (Which probably adds more drag) is wrong huh?
Old 12-05-07, 07:20 PM
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Originally Posted by rx7fc3s87
There are so many things that account for gas mileage. To say there is something wrong with my "setup" is hillarious. I guess 245/40/17, 275/40/17, turbo injectors, and the gp-sports body kit (Which probably adds more drag) is wrong huh?
Yes, almost certainly. Unless you are driving around at WOT, then those mileage numbers are very, very low. The turbo injectors certainly won't help and are probably the biggest part of the problem. It's very unlikely that your NA will need more fuel then the stock 460CCs provide, and even if it does you will need some kind of computer (either standalone or piggyback) to turn the TII injectors down for part throttle driving. Mileage as low as yours almost always indicates a problem somewhere.
Old 12-06-07, 01:25 AM
  #32  
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Originally Posted by rx7fc3s87
There are so many things that account for gas mileage. To say there is something wrong with my "setup" is hillarious. I guess 245/40/17, 275/40/17, turbo injectors, and the gp-sports body kit (Which probably adds more drag) is wrong huh?
Damn, 550cc's and no fuel controller? No wonder.
Old 12-06-07, 11:34 AM
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Originally Posted by rx7fc3s87
How does your BRIDGEPORT rotary motor get better mileage then the RENESIS? There's nothing wrong with my setup. It sounds like you have a math problem.
No trust me I didn't have a math problem. DUring the breakin and initial tuning my mileage went from around 8mpg highway on the first tank to 13 on the next, to 16 and finally leveling off just shy of 20 by the 6th tank. I'm very exacitng in my fill ups since I premix and during this time period I was keeping a very cloe eye on consumption.

And the few people I know with renesis cars get better then 20mpg on the highway. So mine was close, but not quite.

And as I said city mileage is another story. Idling a BP and streetport side by side with a gallon of gas in each tank, the SP will run far longer. Just a function of the port timing/duration mainly.
Old 12-06-07, 12:39 PM
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just curious, what gear/rpm do you bp guys cruise at?
Old 12-06-07, 01:25 PM
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you're going to run out of turbo long before you run out of porting
Old 12-06-07, 01:43 PM
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Originally Posted by Roen
just curious, what gear/rpm do you bp guys cruise at?
Depends. In town I try to drive around 2K or so to keep the exhaust quiet. On the highway, I find the car most likes 3-3.5K.
Old 12-06-07, 02:47 PM
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^almost the same. My cruising is a little higher, 3.5-3.7K
Old 12-07-07, 07:25 PM
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Originally Posted by Aaron Cake
Depends. In town I try to drive around 2K or so to keep the exhaust quiet. On the highway, I find the car most likes 3-3.5K.
im just goin to do a street port with a bigger turbo... an im not throwing random things out to people i just saying that i could do this or i dont wanna do this....an asking people for there thoughts... an being a mile above sea level is alot differnt from cali or places at sea level cars tend to run a little leaner up here than at sea level

Last edited by gabs88gxl; 12-07-07 at 07:39 PM.
Old 12-07-07, 09:33 PM
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don't use RA seals!
Old 12-08-07, 02:36 AM
  #40  
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Originally Posted by 84stock
don't use RA seals!
Jeez... not this again.
Old 12-08-07, 11:14 AM
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Originally Posted by gabs88gxl
im just goin to do a street port with a bigger turbo... an im not throwing random things out to people i just saying that i could do this or i dont wanna do this....an asking people for there thoughts... an being a mile above sea level is alot differnt from cali or places at sea level cars tend to run a little leaner up here than at sea level
With a standalone it won't matter what you elevation is. You'll just need to run more boost.

Even the stock ECU has an atmospheric pressure sensor.
Old 12-08-07, 02:05 PM
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Originally Posted by Aaron Cake
With a standalone it won't matter what you elevation is. You'll just need to run more boost.

Even the stock ECU has an atmospheric pressure sensor.
yea i know that... but say i do a street port with a good turbo maybe a t4 or something bigger can i use my APEXI safc on the stock ecu to help run the car i know i will have to go to a stand alone sooner or later but will that help my car run a little better

Originally Posted by Stanello
Jeez... not this again.
hahahha

Originally Posted by 84stock
don't use RA seals!
why whats wrong with them

Last edited by Aaron Cake; 12-08-07 at 07:15 PM. Reason: Merge three posts
Old 12-08-07, 02:17 PM
  #43  
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i livve in denver. but if you register it in colorado springs than no emisions or in the mountains like the other people said lol
Old 12-08-07, 03:03 PM
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Originally Posted by 2slw4u
i livve in denver. but if you register it in colorado springs than no emisions or in the mountains like the other people said lol
sweet man yea i have a place that if i cant get it to pass then im goin to do it there... so im good....for now i hope lol...
Old 12-08-07, 07:16 PM
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Originally Posted by gabs88gxl
yea i know that... but say i do a street port with a good turbo maybe a t4 or something bigger can i use my APEXI safc on the stock ecu to help run the car i know i will have to go to a stand alone sooner or later but will that help my car run a little better
Not a good idea to run an upgraded turbo on the stock ECU. It won't allow you fine enough control, and won't give you any timing control.
Old 12-08-07, 08:06 PM
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Originally Posted by Aaron Cake
Not a good idea to run an upgraded turbo on the stock ECU. It won't allow you fine enough control, and won't give you any timing control.

ok well i know it runs an works to run a street ported motor with no emissions an a stock turbo on a stock ecu... i know a few people an a car ive worked on that have it done.... timing i can adjust with the crank angle sensor by advancing or retarding it to a timing light... at the moment im just goin to run the stock ecu with my safc an a streetported motor sence i know it can be done...then later i will work my way up to upgrading an doing a stand alone... im not a millionare i cant aford this all at once so im goin to build up to it....
Old 12-08-07, 08:35 PM
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timing light can really only adjust at 1 small rpm section in the powerband. You can be safe in a certain range, but still at risk of detonation everywhere else.
Old 12-08-07, 08:56 PM
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Originally Posted by Roen
timing light can really only adjust at 1 small rpm section in the powerband. You can be safe in a certain range, but still at risk of detonation everywhere else.
yea i know but like i said im goin to work my way up to a standalone an i wanna try to do a msd or some sort of ignition system i dont know any other systems... whats a good system
Old 12-09-07, 10:23 AM
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There are no aftermarket ignition systems that can retard your timing for less money then a standalone. At the very basics of it, a single CDI box on the leading coil with the accessories to make it retard will run $600 or so and be a complete waste of money since you then need to do the exact same thing to the trailing with either a dual channel box (very expensive) or two single channel boxes. By the time you've hacked something together that is barely functional you would have spend more then buying an entry level standalone (at around $800) and probably gone through an engine making it work.

For the most part, you cannot "adjust the CAS" to change the timing. You can bump it back a few degrees but that's about the limit. Keep in mind that the ECU uses the CAS to fire the injectors as well.

A streetport on the stock turbo and ECU will be fine with a piggyback. Once you start upgrading turbos, there is no choice in the matter of going to a standalone. You'll spend far more money on piggybacks and rebuilding engines then just doing it right.
Old 12-09-07, 11:28 AM
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Street port

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