DuffyMahoney Posted August 9, 2023 Author Share Posted August 9, 2023 Since my throttles are taper bore. There isn't a velocity stack that looks classic and is the correct size, so I had these drawn up and cnc cut. Sadly I screwed up a measurement, so they have to get cut again. These are 65mm length stacks, which I think make them look better with the shorter throttle bodies. Thoughts? 865c1107babc421bb8381e64ca3a31b8.MOV Quote Link to comment Share on other sites More sharing options...
DuffyMahoney Posted August 11, 2023 Author Share Posted August 11, 2023 I am trying to get better spring engagement on my R35 Coil stalks. Here is v5. I hope it works! Quote Link to comment Share on other sites More sharing options...
DuffyMahoney Posted August 11, 2023 Author Share Posted August 11, 2023 I have proper spring engagement! Next is 3-5mm longer in the middle section, so the coils push down completely over the spark plug when installed. 1 Quote Link to comment Share on other sites More sharing options...
DuffyMahoney Posted August 17, 2023 Author Share Posted August 17, 2023 Finally nailed down a perfect length, bend with proper spring tension to the spark plug! Now off to Thailand to be made. Quote Link to comment Share on other sites More sharing options...
DuffyMahoney Posted September 7, 2023 Author Share Posted September 7, 2023 Finally got my cnc stacks in! They look amazing Quote Link to comment Share on other sites More sharing options...
MONZTER Posted September 8, 2023 Share Posted September 8, 2023 Those look nice, whats you plan for MAP sensor, Brake booster, ect. Are you going to build a "log" to tie all the cylinders together? Quote Link to comment Share on other sites More sharing options...
DuffyMahoney Posted September 11, 2023 Author Share Posted September 11, 2023 (edited) EFI hardware is saying a Log is bad, a log is what I have done in the past. Its all a ? They want equal length going to a collector. https://www.efihardware.com/products/1963/map-sensor-collector-kit-6-cyl-inc-hose-for-equal-length-connection Edited September 11, 2023 by DuffyMahoney Quote Link to comment Share on other sites More sharing options...
DuffyMahoney Posted October 23, 2023 Author Share Posted October 23, 2023 I decided to make my own intake, this is modern version of my FET. I love the angle for the injector and also getting the throttles away from the heat of the header. Quote Link to comment Share on other sites More sharing options...
tioga Posted November 3, 2023 Share Posted November 3, 2023 I would want to angle the throttles up some like the jenvey manifold since we don’t need to keep them level like carbs. It also gets them up away from the exhaust and looks better in my opinion to have the trumpets pointed up a bit. I realize it would counteract the goal of your up swept runner a bit by pointing the injector a littler steeper down but the amount of wall wetting with that short runner and the angles will be minimal. You could also just put the injector at the port like oem’s do and spray the back of the valve directly since you are making your own intake. Though I guess if you are using a e88-e31 etc head the center intake bolt hole will not be there and thus you will have a hard time getting the injector right at the port. 1 Quote Link to comment Share on other sites More sharing options...
DuffyMahoney Posted November 5, 2023 Author Share Posted November 5, 2023 On 11/2/2023 at 10:47 PM, tioga said: I would want to angle the throttles up some like the jenvey manifold since we don’t need to keep them level like carbs. It also gets them up away from the exhaust and looks better in my opinion to have the trumpets pointed up a bit. I realize it would counteract the goal of your up swept runner a bit by pointing the injector a littler steeper down but the amount of wall wetting with that short runner and the angles will be minimal. You could also just put the injector at the port like oem’s do and spray the back of the valve directly since you are making your own intake. Though I guess if you are using a e88-e31 etc head the center intake bolt hole will not be there and thus you will have a hard time getting the injector right at the port. I had an injector at the head intake, but I didn't love the looks of it. I know that is silly, but it's how I feel. About 30 degrees tilted up is also an option for this intake, but not nearly as good for the injector angle. I agree about tilted up looks good, it makes it look mean. Quote Link to comment Share on other sites More sharing options...
tioga Posted November 7, 2023 Share Posted November 7, 2023 You just passed on a more functional port injector because it didn’t look good. Now passing on a tilted up intake because it looks good but not as functional. The wall wetting you have been obsessing on for the last three + years is not that big a deal. It amounts to an afternoon of tuning your enrichment tables and done. Think about all the American v8’s, Ferrari v12’s lambo’s and every other central v carb motor and all the wall wetting they had but worked just fine when tuned. Plus all the L6 race cars, street cars that made great power with the fuel not nearly as atomized and upstream of every setup you have abandoned. 1 Quote Link to comment Share on other sites More sharing options...
tioga Posted November 7, 2023 Share Posted November 7, 2023 With that current fet shape we are sacrificing air flow for fuel shot geometry. Which is more beneficial? Quote Link to comment Share on other sites More sharing options...
DuffyMahoney Posted November 7, 2023 Author Share Posted November 7, 2023 13 hours ago, tioga said: With that current fet shape we are sacrificing air flow for fuel shot geometry. Which is more beneficial? I have a ford racing engineer that said the runner shape (sort of S) should have little to no effect air flow in a street car, but honestly I don't know that for sure. Lots of engines have wild air paths to the valve (my 5.0 does 180 at one point). But lots of cars have terrible injector angles. The intake design has 2 big benefits, 1 is it gets the throttle bodies up and away from the header, then 2 is the injector spraying down the middle of the runner. I personally think it looks good. I wished the FET wouldn't have been so poorly made. It would have been a much easier project. One thing I haven't talked about a lot is cold starts, and working with automotive engineers, one theory we have been talking about tough cold starts are from intake walls being cold and my poor injector angels, so higher wall wetting and fuel puddling. Then fuel puddles going into the cylinder, thus causing cold start tuning issues. This is probably my least favorite part of ITB so far. Rough cold starts. I am hopeful that spraying down the middle of the runner helps all of this. But time will tell. Honestly my first intake and throttle setup ran the best (jenvy/ harada). I have also gotten much better at tuning, so I kind of wish I had that setup still to see how I can get it to run. Smartest ITB intake would have been Larrys intake with the injector spraying the valves or the Whitley tune intake. Also haltech is moving away from transient throttle in favor of Map prediction, which I have been told is much much better at cold starts and overall light throttle input tuning. Tuning transient took so much time and I didn't have it perfect. Quote Link to comment Share on other sites More sharing options...
DuffyMahoney Posted November 7, 2023 Author Share Posted November 7, 2023 Another thing to note is the car basically ran amazing off low idle (light street) when tuned. I think that poor injector angle isn't a thing, once the engine is sucking enough air/fuel into the motor. Quote Link to comment Share on other sites More sharing options...
DuffyMahoney Posted December 5, 2023 Author Share Posted December 5, 2023 Something sexy to start the week off with. This is a stainless fuel rail for my ITB setup. Expertly crafted by Michel Vienneau! It features injector safety clip stainless cups, built in AN fittings and polished. I’m hopeful it being smaller will allow me to clock my injectors and hide my wiring a bit. Now I can’t scratch it. Michel is a metal magician! Quote Link to comment Share on other sites More sharing options...
ksmithgall Posted December 6, 2023 Share Posted December 6, 2023 What fuel injectors are you currently planning on using? Quote Link to comment Share on other sites More sharing options...
DuffyMahoney Posted December 7, 2023 Author Share Posted December 7, 2023 19 hours ago, ksmithgall said: What fuel injectors are you currently planning on using? This is Steve from EFI hardwares favorite injector for the L with his ITB, their spray pattern was used in the creation of my intake, with the goal of injecting down the middle of the runner. https://www.efihardware.com/products/2720/Bosch-Injector-347cc-3Bar-12-Height-EV14-E85-Compatible-with-Extended-Nose Quote Link to comment Share on other sites More sharing options...
DuffyMahoney Posted December 7, 2023 Author Share Posted December 7, 2023 Intake is coming along! Quote Link to comment Share on other sites More sharing options...
DuffyMahoney Posted December 8, 2023 Author Share Posted December 8, 2023 Version 2 of my 10mm throttle arms are done. I recessed the hardware a little more and added a 5mm allen for safety. Plus designed up a return spring setup to match! I think I’m happy with this aesthetics. Quote Link to comment Share on other sites More sharing options...
DuffyMahoney Posted December 28, 2023 Author Share Posted December 28, 2023 Well the cnc shop missed a program on my first intake and it’s ruined. This is number 2. It’s starting to look amazing. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.