zane9000 Posted August 29, 2006 Share Posted August 29, 2006 I was just curious about peoples opinion on which is better. This is meant for a street driven car that I am building for performance. Emissions is not an issue, I am asking stricktly from a performance stand point. I am running a megasquirt so I will have full control over how the fuel is injected. Quote Link to comment Share on other sites More sharing options...
veritech-z Posted August 29, 2006 Share Posted August 29, 2006 From a performance standpoint, Port injection would give you a more accurate fuel delivery to each cylinder. There were a lot of factory cars equipped with TBI, but not too many of them were performance oriented that I can think of (except the starion/conquest). If you've already got an L28et, and megasquirt, I'd think you would be ahead of the game instead of trying to retrofit some kind of TBI getup on there. Quote Link to comment Share on other sites More sharing options...
strotter Posted August 29, 2006 Share Posted August 29, 2006 As someone who is currently moving from TBI to MPFI, I can tell you that, in terms of performance, everything else being the same (and here I'm thinking airflow), they're - different. Tuning a "wet manifold", per TBI, causes the system to behave much like a carburetor, in that there's a fuel charge present even after you've shut off the injectors. This is most evident in transitions on/off throttle. "Dry" manifolds, per MPFI, have no such behavior, making them (perhaps) more controllable under those conditions. That said, there's a lot to be thankful for with fewer components. For my swap, I installed a Holley StealthRam and a new computer, a GM '7730, so I'm having to learn a new (and much more complex but complete) environment. BTW, the car is no faster (at this point) than it was with the TBI, but I have a *lot* of tuning to do. Quote Link to comment Share on other sites More sharing options...
zane9000 Posted August 29, 2006 Author Share Posted August 29, 2006 The reason I was asking was that I had heard that TBI can be better because the fuel has more room to vaporize through the intake. But it sounds like port injection is still the way to go. Quote Link to comment Share on other sites More sharing options...
veritech-z Posted August 29, 2006 Share Posted August 29, 2006 I guess that would depend on your manifold. It also has that much more room to seperate out if something were not working correctly. Quote Link to comment Share on other sites More sharing options...
zane9000 Posted August 29, 2006 Author Share Posted August 29, 2006 that's true. specifically i am asking because now I'm am wondering where I should put the injectors on the SU manifold that I am converting to EFI. I had originally planed to do port injection but after olderthanme's thread I got to thinking about the possible benefits of TBI. Quote Link to comment Share on other sites More sharing options...
OlderThanMe Posted August 29, 2006 Share Posted August 29, 2006 plus you don't have to buy $600 of injectors to go big... I have such good ideas (lavishing in my sucess)...J/K... Quote Link to comment Share on other sites More sharing options...
veritech-z Posted August 30, 2006 Share Posted August 30, 2006 Well, there were some good ideas being kicked around on the thread you are referencing (most of which were mine, eat your heart out, OTM! j/k). I think if you are shooting for ultimate performance, putting them in the same location they came on the fuel injected cars would be worthwhile. You might as well switch to o-ring style, to open up your options with aftermarket injectors. Quote Link to comment Share on other sites More sharing options...
zane9000 Posted August 31, 2006 Author Share Posted August 31, 2006 i have toyota 440cc injectors with a palnet rail now. and yes, you did have some good idea in the other thread. I just thought i would ask this specific question in a new thread so as to not get too far from what OTM was talking about Quote Link to comment Share on other sites More sharing options...
OlderThanMe Posted August 31, 2006 Share Posted August 31, 2006 no problem...I was just thinking $100 for a pair of TBIs that you will never out grow or you can keep going from 260cc-440cc-750cc-880cc injectors and spending $$$$ or get a pait of V8 TBIs and forget it... Quote Link to comment Share on other sites More sharing options...
veritech-z Posted August 31, 2006 Share Posted August 31, 2006 I really think you're better off with your current setup, Zane. I think there is more power to be had from getting a custom manifold and doing some tuning than to try and rig up some TBI. Quote Link to comment Share on other sites More sharing options...
zane9000 Posted August 31, 2006 Author Share Posted August 31, 2006 well, I AM going to have to go with the dual throttle body SU set up to get my supercharger to work (long story) so since I have to do some customizing anyway, I was just wondering which way would be better in the long run. But I think I will just drill 6 holes at the base of the runners so I can still use my fuel rail that has the stock positions on it. Quote Link to comment Share on other sites More sharing options...
veritech-z Posted August 31, 2006 Share Posted August 31, 2006 That sounds like a cool project. I think drilling the manifold would be the best way. Drill bits are out there to cut those holes specifically for fuel injectors. Quote Link to comment Share on other sites More sharing options...
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