I have a miniram on my car.I never had thought of this before until I found this board and heard alot of the talking about how the minirams rails wont support high hp.I have 50lb injectors in mine,and a Tec 2 which has the quad phased proms so that I have the injectors firing sequentially.My thinking is that a sequentionally fired engine will be easier on fuel rail capacity than a batch fired system ,which the factory ecm is and even some aftermarket systems.I am thinking if the injectors fire as needed instead of emptying a whole side at once like a batch fired,and you can imagine with my size injectors at wot what it would do to the other side of the rails,because of how the rails are desighned.Any comments on this?

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Check out my Hompage,or the beginnings of one.355 dynoed at 400HP at 5800RPM & 410LBFT of TQ,on Motorhttp://www.procharged89z.cz28.com/index.html

 

you said it best yourself darren

Preston has stock fuel rails and goes A LOT quicker than you (sorry )

so i think you'll be fine. Unless you see fuel pressure dropping off as boost/rpms increase your fuel rails r fine...otherwise you are experiencing a VOLUME problem...and should modify the rails

 

Yes,but Im looking for indepth info on sequential vs batch fire in relation to rail capacity.I am quite sure that my rails will support what Im running.But In theory,if you think about it sequential fired motor should be easier on the actual fuel supply in the rails.I hope to get some times soon.I now have to tune with the blower.

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Check out my Hompage,or the beginnings of one.355 dynoed at 400HP at 5800RPM & 410LBFT of TQ,on Motorhttp://www.procharged89z.cz28.com/index.html

 

i am no engineer but,
sequential over batch, they fire the same amount of times just one may get a slight pressure drop due to all at once. which would be a fuel pump problem not the rail problem. it seems to me no one has ever had an issue with a fuel rail being to small.as long as your pump has good flow it should be fine. as for the sequential vs. batch ....thats cool , i was going to get the accel dfi with sequential but got too cheap to do that. and i am sure you know it make a bit more power than batch fire

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87 z28 bowtie aluminum 420small block dry sump crower lt. wt. knife edged crank oliver lt wt rods brodix track 1's super ram intake hooker long tube headers mufflex 4"exhaust accel dfi art carr 700 r4 3.42 gears ssm sub frame/ladder bars.....other parts on the way ,soon to be finished!! couple more weeks!!!

http://people.ne.mediaone.net/gdm

 

Glenn pointed out the other day about Batch vs. Sequential, and at WOT the timing between firing the injectors between each system is pretty much a non-factor.

If this is the case, then fuel rail capacity shouldn't be an issue, since the only concern would be when the engine was at WOT.

 

i'd have to agree, upgrade the Fuel pump. Like a 255 LPH one. Or upgrade it all to AN line and run the Aeromotive pump.

 

Well thanks for the replys but this is not a post about my fuel needs.I already have a 255lph intanks and a boost a pump.My question was in relation to the miniram rails in batch fire vs sequential.Now you can say thier is little or no diffrence between the 2 at wot,but you must know the design of the miniram rails opposed to the stock configuration.Stock,as the fuel enters the rails it ca split up and feed both rails instantly.Now on the miniram rails the fuel must flow from one side to the other in one direction with the fp regulater at the end.So what Im saying is if this sytem was batch fired,Iam thinking in theory now,as the first bank fires(closest to the fuel enterering the rails,it will ultimtly starve the other 4 at the end of the rails,because like I said it must travel to the first 4 ,then on to the last 4.Any thoughts?

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Check out my Hompage,or the beginnings of one.355 dynoed at 400HP at 5800RPM & 410LBFT of TQ,on Motorhttp://www.procharged89z.cz28.com/index.html

 

i dont think it would really matter because there is always fuel in the rails....and the injectors then fire and then fuel gets into the cylinders

its not like fuel just flows into the rails and flows in the cylinders.....fuel builds pressure in the rails/lines and is then sprayed via the injector

but i know you know this darren, but maybe didn't think about it this way

If you had a carb, this would be an issue. Thats why on most good carbs you have one line split into a duel feed into each side of the carb to get the fuel in the bowls right

----As for this big debate with sequential vs batch.....i've done a lot of research and i know people who've run both setups and have done extensive dyno testing and sequential has always added AT MOST 5-7hp more than batch

usually where sequential shines is in part throttle fuel mileage and decrease in emissions