| Slant Six Forum https://slantsix.org/forum/ |
|
| Any interest in a dedicated TBI intake? https://slantsix.org/forum/viewtopic.php?t=56284 |
Page 2 of 2 |
| Author: | Matt Cramer [ Mon Sep 29, 2014 7:44 am ] |
| Post subject: | |
Quote: Reed, do you think that an EFI setup like your describing is better than a TBI setup?
I have not been impressed with the fuel distribution on TBI intakes on other motors, and there's not much you can do to tune out the issues without modifying the manifold as you don't have cylinder by cylinder control. If you're developing one of these, I would recommend doing so on a motor with a set of six EGT probes and see just how even the mixture is with your adapter vs a carb and vs a TBI on a crude flat plate adapter. If you get an improvement there, you'd have quite a selling point.
|
|
| Author: | oldskoolracer [ Mon Sep 29, 2014 10:05 am ] |
| Post subject: | |
Theres simply no comparing MPFI to TBI in any way shape or form... Two completely different worlds with completely different applications... TBI is literally just a glorified, fully electronic carburetor... That in fact is the ONLY upside to TBI is computer control that can compensate for a multitude of loads, applications, temperature, elevation etc... Whereas a carb is all mechanically adjusted and is based off of the principle of "close-enough"... TBI and carb are both "wet" manifolds and will suffer some form of distribution issues as well as some extent of puddling... With that, I would love to convert to TBI for its simplicity and ease of installation, not for any hope of performance gains, or precise accuracy... A dedicated manifold for a slant would be awesome IMO, especially in my situation owning a 78 Volare that has no hood clearance at all! I can NOT run any adapters, spacers, or anything else that will raise the overall intalled hieght above the stock carb/air cleaner aseembly... May as well set it up with the throttle blades in the north/south configuration vs the standard east/west... (think that came out right lol) |
|
| Author: | Reed [ Mon Sep 29, 2014 11:24 am ] |
| Post subject: | |
I want to make my position clear- TBI is better than a carb in that it can control the fuel mixture more accurately. TBI is worth ugrading to from a carb provided the system allows you enoigh control over the tune to "dial it in." Lots of good and impressive work has been done adapting TBI to the slant six withgood results. However, my own personal opinion and preference is that if I am going to spend the time adapting and programming a fuel injection system I would rather jump straight to a true sequential MPFI dry intake system with a MAF sensor. It is only minimally more difficult, and a bit more expensive. I don't want to bash anybody who has installed TBI, I just wouldn't want to do it on my car. |
|
| Author: | CNC-Dude [ Mon Sep 29, 2014 6:51 pm ] |
| Post subject: | |
It's like most any other part, it has different appeal to different people. For the Cheby guys, they cannot use an EFI setup effectively with their siamese head as an EFI can only be used to any benefit if they do extensive port modifications to divide the intake ports which is dicey at best. So to them, TBI is the only real alternative for an injection setup. But as mentioned, some here would rather go right to the top with an EFI setup. Thanks for the input guys. All comments have been appreciated and I respect all of your individual positions in this matter. |
|
| Author: | oldskoolracer [ Wed Oct 01, 2014 10:52 am ] |
| Post subject: | |
I like a bit of everything, at home I have my slant thats carb'd, my 89 GTI wich has mechanical fuel injection (what a PITA), my 91 Chevy has TBI, and my 98 Escort wich is MPFI with variable cam timing... As mentioned each has ups, and each has downs, I would have to say for everyday I like the carb the least because its a constant battle of adjusting, readjusting, and recompensating for one thing or another. Next is TBI because its alot more forgiving than a carb and is a very simple system to work with. My favorite for performance is the mechanical on my Golf, it very primitive, very adaptable, and can support ALOT of power adders with the downside of alot of clutter... For everyday simplicity and complete control you definately cant beat a good MPFI set up though, wether its for a daily or trying to get every bit of efficiency from your fuel and ignition systems... |
|
| Page 2 of 2 | All times are UTC-08:00 |
| Powered by phpBB® Forum Software © phpBB Limited https://www.phpbb.com/ |
|