High or Low impedance injectors?

cre · 04-24-2011, 08:01 AM

I haven't set up a MS system myself yet, but I do know low impedance will work just fine. My personal preference is low impedance for the reasons you list and quite simply because in the circles I work within they're easier to come by. The resistor pack is not a big deal at all and isn't anything which would affect my choice.

You're not going to need any larger than stock GTE injectors either... Could buy a set with a couple extra get them all serviced and blue printed and have a set of matched injectors for a lot less than new if you're looking for reliable but inexpensive.

I hope you're at least using NEW and moly coated pistons if you're using cast, GE spec pistons.... I've see a large number of pelted 7M-GE pistons all based on the whole "I'll only be running Xpsi". I happen to have one sitting on my desk which was ONLY running 8psi on a very well tuned engine. Water/methanol injection will help a little, but it has it's downsides too...

87hilux7mge · 04-24-2011, 08:32 AM

good news on the injectors then, ill use that flowmatched set of gte's. hes only put about 2k on them, and has all the paperwork from them. traded him a trick fuel rail for them so im not actually out any money.

as for the pistons, they are stock type cast, i had them teflon coated just the other day, pulled the block back apart to do it, but they all went back in just fine as well. so hopefully that will help a lil. i had it done by a buddy of mine and they all looked really good. unfortunately i didnt get any pics! fail..

i plan on building a boost ready block with forged pistons while i have the truck runnin so im not terribly worried about this lasting like 100k miles. prolly be lucky to get 5k out of it with a good tune and low boost. but as soon as the boost spec engine goes in, that boost will prolly be cranked to about 14-15 if the m90 can handle it. ill also use the time to get a transmission sourced for it cuz that w56 is gonna self destruct for sure.

out of curiosity what are the disadvantages to water/meth injection?

04-24-2011, 08:01 AM	#1
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	I haven't set up a MS system myself yet, but I do know low impedance will work just fine. My personal preference is low impedance for the reasons you list and quite simply because in the circles I work within they're easier to come by. The resistor pack is not a big deal at all and isn't anything which would affect my choice. You're not going to need any larger than stock GTE injectors either... Could buy a set with a couple extra get them all serviced and blue printed and have a set of matched injectors for a lot less than new if you're looking for reliable but inexpensive. I hope you're at least using NEW and moly coated pistons if you're using cast, GE spec pistons.... I've see a large number of pelted 7M-GE pistons all based on the whole "I'll only be running Xpsi". I happen to have one sitting on my desk which was ONLY running 8psi on a very well tuned engine. Water/methanol injection will help a little, but it has it's downsides too... __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

04-24-2011, 08:32 AM	#2
87hilux7mge walbro fp Join Date: Dec 2010 Location: spokane Posts: 479	good news on the injectors then, ill use that flowmatched set of gte's. hes only put about 2k on them, and has all the paperwork from them. traded him a trick fuel rail for them so im not actually out any money. as for the pistons, they are stock type cast, i had them teflon coated just the other day, pulled the block back apart to do it, but they all went back in just fine as well. so hopefully that will help a lil. i had it done by a buddy of mine and they all looked really good. unfortunately i didnt get any pics! fail.. i plan on building a boost ready block with forged pistons while i have the truck runnin so im not terribly worried about this lasting like 100k miles. prolly be lucky to get 5k out of it with a good tune and low boost. but as soon as the boost spec engine goes in, that boost will prolly be cranked to about 14-15 if the m90 can handle it. ill also use the time to get a transmission sourced for it cuz that w56 is gonna self destruct for sure. out of curiosity what are the disadvantages to water/meth injection? __________________ 87 toyota 4x4 single cab short box pickup, 7MGZE.

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