individual throttle bodys
#76
Old [Sch|F]ool
Can anyone post any dyno results for running primaries only? Or any videos of idle? I am finalizing the last few pieces of my set up and I still can't decide whether to run primary only or run staged. I would need to fab up a fuel rail and decide on secondary place to if I went with the latter.
I've only ever run primaries only. GSL-SE fuel rail and I blocked off the secondary passages on the S4 intermadiate manifold I used so that the air filter would fit better with no secondary fuel rail in the way. Basically any video you ever see on my YouTube channel that involves my RX-7 will be primaries only, since I don't think I have any videos from when I had a carburetor. Everything since September of '12 will be my ITB-like non-Holley setup.
If I can get my rearend put back together for this weekend (shredded a GSL-SE axleshaft, took out my last limited slip too and also wrecked the ring and pinion ) then our annual Dyno Day will see how well my engine does now with MS2 and RC 1000cc injectors.
Last edited by peejay; 04-28-15 at 11:51 PM.
#78
Rotary Motoring
iTrader: (9)
Jager I'm curious on this lately.
I'm contemplating going with ITB's or even a carburetor on my 1986 FC.
Did Kahren just do the two intake manifolds and never anymore?
Kahren made two intake manifolds?
I knew this one that did 180rwhp on completely stock 6 port keg-
Are you counting Colin's stock S4 TII intake manifold/stock ecu one that did 195rwhp on the streetport 6 port NA as the second manifold?
I'm contemplating going with ITB's or even a carburetor on my 1986 FC.
Did Kahren just do the two intake manifolds and never anymore?
Kahren made two intake manifolds?
I knew this one that did 180rwhp on completely stock 6 port keg-
Are you counting Colin's stock S4 TII intake manifold/stock ecu one that did 195rwhp on the streetport 6 port NA as the second manifold?
#80
Tear you apart
iTrader: (10)
Those are both that I referenced.
Quinn's was the only one that I knew of that ever made it on a customers car. I liked how it kept the throttle body, and seemed to drive just fine. I heard great things about that car.
I wonder if we can get old man Kahren into this thread?
Quinn's was the only one that I knew of that ever made it on a customers car. I liked how it kept the throttle body, and seemed to drive just fine. I heard great things about that car.
I wonder if we can get old man Kahren into this thread?
#84
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 30,792
Received 2,573 Likes
on
1,829 Posts
pretty sure you can put the gsl-se/T2 regulator (they are the same) on the primary rail. some JDM cars came that way.
although i've wanted to see if BSFC gets better with higher fuel pressure for a while now
although i've wanted to see if BSFC gets better with higher fuel pressure for a while now
#87
Full Member
iTrader: (4)
S5 6 port half bridge (primary bridge)
Racing beat street port dual system
Haltech f7b
Racing head itb w/ racing beat upper dcoe intake
Msd 6al2 with direct fire 2nd gen coil
Msd blaster coil and stock dizzy for trailing
Two 850cc injectors
Bosch 198lph pump
Sard FPR @40psi
4.77 Kia ratio with s4 gxl LSD
S4 tii trans
Exedy stage 3 hyper single
Plan on making a broad usable power band and 200+ whp
Pulls nice mid to high (5-10,000rpm)
Racing beat street port dual system
Haltech f7b
Racing head itb w/ racing beat upper dcoe intake
Msd 6al2 with direct fire 2nd gen coil
Msd blaster coil and stock dizzy for trailing
Two 850cc injectors
Bosch 198lph pump
Sard FPR @40psi
4.77 Kia ratio with s4 gxl LSD
S4 tii trans
Exedy stage 3 hyper single
Plan on making a broad usable power band and 200+ whp
Pulls nice mid to high (5-10,000rpm)
#88
Rotary Enthusiast
iTrader: (5)
^that is pretty close to the setup I have. I have a one piece manifold with the race head itbs. I still need to figure out how to adapt my throttle cable though. When I bought my setup, he hadn't created the cable wheel and only had the lever available.
I do want to get the Kia gear though.
I do want to get the Kia gear though.
#89
Full Member
iTrader: (4)
I fabricated a bracket to hold the stock throttle cable bracket using the 10mm bell housing ground location. Buy the cable wheel from them it's cheap but keep it tight mine was getting loose and idle kept dropping. The tps is nice and works great when you wire it correctly lol. My afr is mid 12's throughout the rpm range wot and I dial fuel back 10% with my trim **** for 14 afr cruising.
I have to make sensors for the haltech air temp and water temp, I have the raw sensor that goes into the stock brass housings. I just put trim potentiometers for the sensors and locked them at a certain temp.
I have to make sensors for the haltech air temp and water temp, I have the raw sensor that goes into the stock brass housings. I just put trim potentiometers for the sensors and locked them at a certain temp.
#90
Rotary Enthusiast
iTrader: (5)
Yeah. I think I will purchase the cable wheel instead of trying to adapt different fittings. What do you plan on running for filtration? The way these velocity stacks are designed does not make them friendly to most itb filter setups.
I am personally debating just getting slip on filter for daily driving until I fabricate a plenum.
I am personally debating just getting slip on filter for daily driving until I fabricate a plenum.
#91
FB Custom
iTrader: (3)
Just my opinion, but I have always felt that ITB's meant 4 individual runners and 4 individual throttles. Best way to be able to control flow and power characteristics without introducing reflective pulses and diluted signal. Just a simpler setup.
I get instant response and fairly broad power curve with 4 throats and 4 runners. Of course your experiences may be different, but I used the IPRA cars as a model when I built mine and I am now extremely pleased with the setup.
Eric
I get instant response and fairly broad power curve with 4 throats and 4 runners. Of course your experiences may be different, but I used the IPRA cars as a model when I built mine and I am now extremely pleased with the setup.
Eric
#92
Rotary Freak
RX7 Close Up - Nummelin Motorsports Group
The driving characteristics are not at all what I was imagining. The car is very tractable, very strong at lower rpms and never lets up the pull to over 9,000 rpm. The only drawback at this point is that I am still running trumpet socks and they are really killing the airflow up high. I need to finish off my airbox and get better filtered airflow.
Eric
Last edited by 23Racer; 05-29-15 at 07:15 AM.
#93
FB Custom
iTrader: (3)
I am opening all 4 at the same time, but staging the injectors with Primaries in the center iron (like stock) and the secondaries out in the outer bodies. It may not be the best in terms of power, but it works great. Here is a picture of what they look like in car;
RX7 Close Up - Nummelin Motorsports Group
The driving characteristics are not at all what I was imagining. The car is very tractable, very strong at lower rpms and never lets up the pull to over 9,000 rpm. The only drawback at this point is that I am still running trumpet socks and they are really killing the airflow up high. I need to finish off my airbox and get better filtered airflow.
Eric
RX7 Close Up - Nummelin Motorsports Group
The driving characteristics are not at all what I was imagining. The car is very tractable, very strong at lower rpms and never lets up the pull to over 9,000 rpm. The only drawback at this point is that I am still running trumpet socks and they are really killing the airflow up high. I need to finish off my airbox and get better filtered airflow.
Eric
I have a half bridge with a 4 barrel throttle body and it is currently set up for staged linkage, the staggering of the injectors is a little rough but it seams to have good controllable low end. I have a couple 88lbs/hr (1000cc) injectors sitting here and I am going to try to run just 2 injectors on the primary's. Only thing I am unsure of is having a smooth idle with these large injectors.
#94
Rotary Freak
I opened them up all at once as I don't need low RPM tractability or fuel economy. Mine is on a race car and it just has to start, hold an idle and perform well north of 4,000 rpm. If I'm below that then it means I made a mistake and need to downshift or the car is coming in to the pits.
What has surprised me is actually how progressive the throttle is anyways. It may open more at 1/4 throttle than a stock TB, but it just means the car gets more air at a smaller pedal movement. Works great!
Eric
What has surprised me is actually how progressive the throttle is anyways. It may open more at 1/4 throttle than a stock TB, but it just means the car gets more air at a smaller pedal movement. Works great!
Eric
#95
Tear you apart
iTrader: (10)
S5 6 port half bridge (primary bridge)
Racing beat street port dual system
Haltech f7b
Racing head itb w/ racing beat upper dcoe intake
Msd 6al2 with direct fire 2nd gen coil
Msd blaster coil and stock dizzy for trailing
Two 850cc injectors
Bosch 198lph pump
Sard FPR @40psi
4.77 Kia ratio with s4 gxl LSD
S4 tii trans
Exedy stage 3 hyper single
Plan on making a broad usable power band and 200+ whp
Pulls nice mid to high (5-10,000rpm)
Racing beat street port dual system
Haltech f7b
Racing head itb w/ racing beat upper dcoe intake
Msd 6al2 with direct fire 2nd gen coil
Msd blaster coil and stock dizzy for trailing
Two 850cc injectors
Bosch 198lph pump
Sard FPR @40psi
4.77 Kia ratio with s4 gxl LSD
S4 tii trans
Exedy stage 3 hyper single
Plan on making a broad usable power band and 200+ whp
Pulls nice mid to high (5-10,000rpm)
Care to help us with what you all bought from them for the ITB's?
#100
Tear you apart
iTrader: (10)
Body
RHD Engineering | ITB 48mm
Trumpets
RHD Engineering | 48mm Ram Tube
Bosch TPS
RHD Engineering | Bosch Style TPS
RHD Engineering | Bosch TPS Adapter
Cable wheel
RHD Engineering | Cable Wheel
Also, it seems that it's logical to fire two injectors instead of 4, does this create any issues in drive ability or tuning?