Hi,

I didn't have time to search so try to be nice .


Just wondering if this is a good/bad idea? Everything else will be kept stock i.e. injectors, fuel, boost, etc. etc. I don't see why this would be a problem, but I just want to be sure.


Thanks,
Rizwan

 

with a street port your boost will rise...do you have a boost controller to keep a steady stock boost? if you do i think you should be ok

 

Riz, whats up man. I have been running a street port and stock ECU for over 4 years with no related problems. Besides the fact that i reaaaallllllllllly need a tune running as-is has worked well. I have a few mods but most importantly I:

-never have run over 10psi
-have had a stock cat and now a high-flow cat
-have a manual boost controller


with a cat and controller you should be ok in terms of boost. The current twins on there have the wastegate ported and that how i bought them...not sure if it would effect things to much if it didnt.


So which car is this for? dont tell me you have or are getting another one!?!
BTW, the red car is sweet and you DEF can get near 20 for it. As far as your other beast....it makes me cringe in my sleep what that thing is going to be capable of. DIBS on a ride!


ha, alright man, take it easy and hopefully that gives you a little bit of insight now

 

Yeah, Wtf you get another FD?? It is also safe run to a streetport with a stock ecu just keep the boost at that magic number 10 Pretty soon i wont have to worry about creep myself

 

100% correct. I had a mild Street Port, CAI, PFS IC, DP, MP, STOCK CATBACK, on a STOCK ECU. Ran like that for about 2-3 years, WOT all the time but always kept my boost at 10 psi max.

 

Stock ECU limit boost to 10 psi. The rest is cross your fingers if you can't do that.

 

How much power you guys making with the streetport/stock ecu combination?

 

Thanks a lot, Ted! That's exactly the type of info I was lookin' for.


Re Boost Controller: Is this that necessary? I was under the impression that the stock ECU itself limited boost to 10psi? If not, how easy is it to adjust a manual boost controller to have it set at 10psi max? I might go this route...

 

Re FD: Oh, almost forgot. I haven't picked up another FD. I probably won't for a little bit either, unless of course I come across a steal . Once the black one is done, I'll let you know man. It'll be pretty tame for now, but if you still want a ride, I got you .


At the moment, I'm lookin' in to purchasing an MKIV Supra. I have a lead on a great deal. Hopefully it works out.

 

You will absolutely need a boost controller. The stock ecu does try to maintain 10psi however, it fails miserably. You will get boost creep without one. I was getting boost creep with just my downpipe. If you wanna go with a manuel controller, search for home depot boost controller. This will cost you less than $10.00 and works well. That's what I used for mine. Also to more effectively control that boost, you may want to also consider porting the stock wastegate. This will prevent spiking all together.

 

you can actually have an straight through exhaust (DP, MP, CB) if you have
1) boost controller
2) have your wastegate ported

 

This is absolutely correct - the stock boost "control" system does not use boost feedback to control, it relies on a pre-programmed map to do this. When you do performance (air intake, porting & exhaust) improvements, the stock "control" will not work.

Here is a link that may help:

https://www.rx7club.com/showpost.php...6&postcount=10

 

A boost controller can only raise boost. Wouldn't you get boost creep? If so then you would need to port the wastegate. Correct me if I am wrong, but this is what ive read on the forum many times.

 

if you go the manual boost controller route...

http://www.rx7.org/Robinette/boost_controller.htm

be careful, people have blown there motor trying this ....cheers

 

Would I still need a Boost Controller if I have a hi-flow cat installed? The wastegate probably won't be ported though...


I'm just wary of manual boost controllers and not determined to keep an electronic one I have.

 

Not true. If the boost potential is above the WG spring's preset 7 psi, then the boost controller can (barring boost creep due to needing WG porting) can control down to that level (7 psi).

 

Again, ball/spring or electronic controllers do much better than needle-valve types, since the ball/spring types completely eliminate reliance on the stock ECU and solenoids for control.

 

I still say port the wastegate if you plan to run a full exhaust, even with a hi flow in place. Even with the wastegate pills pulled the car will usually run about 9psi in the midrange and creep to 10 at the top of the rpm band. Some will creep higher. The boost controller isnt much help if you dont port the wastegate or if you have a full exhaust without wastegate porting. Ive seen so many cars act different ways with the boost pills removed or in with a full exhaust.

Also I do not recommend a large streetport with a stock ecu. A medium sized streetport shouldnt cause the car to act different but with a large port the car will tend to run extremely rich/smoke at idle. This is my personal experience with two large street ports on stock ecu.

 

Well if your just running it for temporary, so you can save money to get an ecu it should be fine! I wouldn't run it at wot though, for me I would never gamble my motor like that. Your increasing exhaust which in turn is going to increase boost pressure, and may be a little more difficult to control. Just because it works for someone else doesn't mean its going to work for you the same way. If you haven't figured it out yet these motors can be temperamental as hell! Biggest advice don't be a tightwad for crying out loud, get an aftermarket standalone or upgraded ecu at least this way you could have some flexibility by running your engine richer, until you figure out what the motor is capable of through proper tuning. Why would you put money on streetport and not get an ecu so that you can get the most power out of the new modification?

 

I appreciate the advice, but could go without the criticism. I posted this thread to simply get some answers, which I was unsure about.


You don't know the circumstances and I didn't once mention the car or its modifications. I just wanted to know if this was a feasible and safe option.