gcthree

I'm driving one of Mr. RX7 TT's streetports, and frankly, I cannot tell the difference in idle quality from stock ports. We also installed the PFC at the same time the streetport was done, and that made a world of difference in the idle quality, too. It maintains a nice smooth 800 rpm idle, and pulls seamlessly through the rev band.

Mr rx-7 tt

iTrader: (5)

I have been building roataries for over 20 years. I have ported every port imaginable. I know EXACTLY what an "aggressive" streetport is. If tuned correctly an aggressive streetport will idle smooth...

Fd3BOOST

iTrader: (7)

I agree with that statement completely.
I made my ports fairly large for a street port and my idle sits comfortably at 700-750 rpm at Idle. No lope.. Only get it slighty at start up. If its lumpy you have too much fuel going in. I'm doing that with a purple box too if you can belive that.

Fd3BOOST

iTrader: (7)

Mr. RX7TT.
You the fellow who came with Rob and drove the black Fd at MIR, Import Vs. Domestic last season?
That was my first day on the track.

93BlackFD

i was referring to the exhaust....

if you get agressive with the exhaust, it will NOT idle smooth

Mr rx-7 tt

iTrader: (5)

Uh, yes it will. I have ports that you could put a tennis ball in...glass smooth idle. Where are you getting this idea from?

matty

this thread should prove interesting.......

Fd3BOOST

iTrader: (7)

I wouldnt say my exhaust ports are all that large..
The are however much larger than stock and still I also have a smooth idle.

Mahjik

iTrader: (1)

Guys, in J.S.J's case his car is all stock aside from the streetported engine he just dropped in (so he's using the stock ECU unless he just ordered a PFC).

While I'm sure you can adjust ECU's for a better idle (as the streetports I've heard on PFC's are smoother than those on rechipped ECU's), that's not the case for the starter of this thread.

felix_is_alive

if hes using a rechipped ecu or no ecu at all then he should have a bit of a rough idle
reason being the ecu sees less vacuum through the map sensor and will try to adjust for more fuel because it thinks that youre accelerating ,thats why most of rechipped or no ecu whit streetports have wierd idle and rich idle

93BlackFD

not the size of the exhaust port, but rather, more importantly, the opening/closing characteristics

J.S.J

I understand the system is running real rich at idle and I am lucky to have 15 inches of vacuum there. I did attach a vacuum pump to the map sensor and the idle did smooth out a lot. I also leaned the mixture by pinching off the fuel fuel line and it ran smoother for a second or to. As I understand using a system interface to tailor the A/F ratios is needed. I just put 15 gallons of fuel in the tank and it is going fast. With an engine which is street ported and maybe a down pipe what P.F.C is the best overall for someone who wont likely mod further than this?? You guys know the best stuff to use and I don't want to run the engine a lit more running so rich.

pluto

Might want to verify that the coolant sensor and the fuel temp sensor were in the right place since they're the same color and same fitment. I have seen alot of people messed this up when they drop an engine in their car.

felix_is_alive

THANK GOD , i thought i was the only idiot who did that mistake ,that sucka got me good one time

Mr.kidD

I have a lumpy/ loopy idle and I'm in the process of tuning my microtech. Are you saying that Its possible that a good idle tune will drop me from 1200rpm-1000rpm to 800rpm with smooth idle and less gas consumption? this is my dream hahaha please explain. I thought it was impossible for street ports to idle smooth and low. Now I'm thinking it's my idle that's fouling my plugs...