best injector setup for 500+whp
best injector setup for 500+whp
hey guys im in the process of finishing up my build and was wondering what size injectors you all would recommend going with. I have aftermarket rails that are a bigger inside bore but retain using the stock style injectors. from what I have read would something like 1000/1680 be ok for these kind of numbers? im running a s366 divided custom manifold with twin mvr wastegates. motor is a half Bridgeport
i would just go with ID 1000pri/2000sec and call it a day.
1680's are old school, no reason to stick with a 25+ year old injector when there are better available. making power costs money and when it comes to injectors, they can make or break your engine.
1680's are old school, no reason to stick with a 25+ year old injector when there are better available. making power costs money and when it comes to injectors, they can make or break your engine.
Last edited by RotaryEvolution; Nov 28, 2016 at 11:45 AM.
Originally Posted by RotaryEvolution
i would just go with ID 1000pri/2000sec and call it a day.
1680's are old school, no reason to stick with a 25+ year old injector when there are better available.
1680's are old school, no reason to stick with a 25+ year old injector when there are better available.
A tried and true combo.
I totally understand the reasoning behind that but the only reason I was wanting to stick with the factory style injectors is because the new fuel rails I have are made for factory style. otherwise I would go with the ids
any injector aside from the stockers require some finessing around, the IDs just require the proper spacers so realistically they all take the same effort to fit.
at 500whp the stock style injectors are far too softly placed in the engine, they tended to leak at around 10psi even with brand new rubbers(namely because the top rubber bushing has too much give for high boost). i actually like to fit them fairly snug to semi tight, to the point you can barely twist them once the rails are bolted down.
boost leaks drop turbo efficiency, making it have to work harder to produce the same numbers as a properly setup leak free system. it is nearly impossible to have absolutely no leaks, but if you can cut them down substantially you will make the most power you can from your setup.
at 500whp the stock style injectors are far too softly placed in the engine, they tended to leak at around 10psi even with brand new rubbers(namely because the top rubber bushing has too much give for high boost). i actually like to fit them fairly snug to semi tight, to the point you can barely twist them once the rails are bolted down.
boost leaks drop turbo efficiency, making it have to work harder to produce the same numbers as a properly setup leak free system. it is nearly impossible to have absolutely no leaks, but if you can cut them down substantially you will make the most power you can from your setup.
Last edited by RotaryEvolution; Nov 28, 2016 at 08:54 PM.
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I dont think that pump will be suited.
For as long as I have known rotaries I was always told when planning a pump for a rotor build it requires 30% more fuel.
you CANNOT skimp on the fuel, its a real easy way to go kaboom really fast
For as long as I have known rotaries I was always told when planning a pump for a rotor build it requires 30% more fuel.
you CANNOT skimp on the fuel, its a real easy way to go kaboom really fast
any injector aside from the stockers require some finessing around, the IDs just require the proper spacers so realistically they all take the same effort to fit.
at 500whp the stock style injectors are far too softly placed in the engine, they tended to leak at around 10psi even with brand new rubbers(namely because the top rubber bushing has too much give for high boost). i actually like to fit them fairly snug to semi tight, to the point you can barely twist them once the rails are bolted down.
boost leaks drop turbo efficiency, making it have to work harder to produce the same numbers as a properly setup leak free system. it is nearly impossible to have absolutely no leaks, but if you can cut them down substantially you will make the most power you can from your setup.
at 500whp the stock style injectors are far too softly placed in the engine, they tended to leak at around 10psi even with brand new rubbers(namely because the top rubber bushing has too much give for high boost). i actually like to fit them fairly snug to semi tight, to the point you can barely twist them once the rails are bolted down.
boost leaks drop turbo efficiency, making it have to work harder to produce the same numbers as a properly setup leak free system. it is nearly impossible to have absolutely no leaks, but if you can cut them down substantially you will make the most power you can from your setup.
that pump actually should suffice, but i have no experience with that size walbro, just the 400 and 255.
the walbro 255 with a kenne belle BAP can actually handle 450+whp, the walbro 400 handled 500whp without the BAP(turned it down to zero since it wasn't needed) and seemed to have plenty of reserve.
the walbro 255 with a kenne belle BAP can actually handle 450+whp, the walbro 400 handled 500whp without the BAP(turned it down to zero since it wasn't needed) and seemed to have plenty of reserve.
I ran IDs in my stock rails no problem. Just get the versions that are 60mm long with 11mm top orings and run FFE lower spacers.
are these the spacers you speak of? FC Lower O-ring Inserts | Full Function Engineering
are these the spacers you speak of? FC Lower O-ring Inserts | Full Function Engineering