Its time for me to get some fuel upgrades and im not sure which direction i should go. My mods right now are intake, full exhaust, PFC, fmic, profec b boost controller.
After fuel upgrades i want to get my car tuned for 15 psi. I plan on going single turbo in the future, but not for a while. Should I get my stock 850's bored out to 1300cc injectors by rx7store.net and a nippondenso fuel pump (560$), or should i get the rx7store.net extreme fuel kit that comes with bosch 1600cc injectors, new fuel rail, fuel pressure regulator, pressure gauge, all lines and fittings, and a nippondenso fuel pump (840$)?

 

if you plan to go over 400 HP then go with the 1600's but if not just bore out the 850's and you will be fine...

 

I basically have the same set up as you. I have an intake with a PFC and im going to get the DP/MP combo from rx7store and run a cutout at the end of the MP(maybe). Which i will then get tuned for 14 or 15 psi. I too plan on going t-78 turbo after my rebuild. I have the 255lph walbro which is effiecient enough for my needs. I also plan on getting 750 pri. injectors with 1300 or 1600 sec. I haven't decided yet due to me still having twins. You can buy the primary fuel rail from rx7store that is modified to fit your stock 850cc sec. injectors into them. You can get that and then buy an aftermarket sec. rail with upgraded injectors. You also may want to consider getting new fuel lines, a FPR and also a Fuel pressure guage. If you get these fuel upgrades you may want to consider upgrading your ign. also.

Jeremy

 

In my opinion, the less you screw with your fuel system the better. These cars love to catch on fire and burn to the ground---I have heard of/seen the results of over a dozen that I can remember.

I have had 850s/1300s and the Supra pump for years now and am happy w/the setup. Stay away from the Walbro pump.....it's smaller than stock and I have heard numerous bad things about it over the years from many sources.

 

I am with stupid above me....I have a milled primary rail with 850s and 1600 in an aftermarket rail with a supra pump...The pump is super easy to replace...BUT if you have twins...the injectors can be a bit of a BIATCH to get to.

 

Greetings Porpoise Boy,

stock sequential twins (this means they are 'staged' and come on at different rpms to minimize boost lag and maximize responsive ) perhaps yes.

With my Bad **** BNRs run in parallel, I can see all 4 injectors just by popping the hood.

--Rico Suave

 

The walbro is smaller than the stocker but it outflows more and takes in MUCH more than the stocker. The denso one is good also but there are charts showing that the denso and walbro are almost alike, even though the walbro is smaller than the stocker. I can't argue with the MKIV TT pump, although being the same as the denso, my comparison along with the walbro is still the same. The MKIV TT pump i believe is more of a straight drop-in pump(correct if wrong) than the walbro. I have friends that run with walrbos and have not seen one not fulfill its duty. Using a FPR and proper lines, rails and injectors will get you to what you need. Depening on your HP goal, walbro will be sufficient enough for your needs. I don't need a fancy name to know that my part flows more. Although i do like the name of having a MKIV TT pump . As long as i know it will be efficient in my needs, i'll be fine with having it.

Jeremy

 

Both Dave at KD and Ari at RP expressed their preference for the Supra pump over the Walbro to me years ago, and many of the domestic (mustang guys mainly) types that I used to hang out with told me horror stories of being stranded on the highway b/c of the Walbro.

Much like a sorority chick at a friday night bar at closing time, I am going for the 'bigger is better' motif when it comes to my fuel pumps

 

I'm running the Walbro right now. Have been for about a year with no problems. I forget who I talked to before I bought mine but they said that they've never had a problem with theirs. Hopefully mine will not take a dump on me... Oh yeah, 550's & 1300's. I'm hoping I have enough fuel for my BNR's @ 15psi (hopefully 380+hp).

 

i just ordered 1300cc injectors and a supra pump (nippondenso). do i send him my 850cc injectors now? or after i get the 1300cc injectors?

 

It all depends on how big you plan to go some day. You could get another set of 850's and put them in the primary position. Some people have reported problems with the 1300 injectors getting stuck and causing blown engines. I however never had a problem with mine. I've run the stock 550/850 set then went to 550/1300 with the Denso (Supra Pump) and now I have 850/1680, and I purchased a A1000 pump, but may go with another Denso, a Bosch or even a dual Walbro setup.

BTW: I wish I would have kept my stock 850's back in the day so I wouldn't have had to purchase them all over again.

 

Why did you buy them again? For the primaries? Do the 1300 cc nippo's drop right into the secondaries?

 

Thats wierd how some people think the walbro has had some problems or that it doesn't flow as much as the stock. Supra owners that are going for big hp almost always ditch there stock pump and run dual walbros. From an internet concensus i think that the walbro has a good product but either way will work, either pump could also have problems. Products fail, because nothing is ever made perfect.
Good luck with your car buzzer, let us know what you decide.

 

Are you talking about the supra twin turbo pump or the n/a pump? The supra tt pump has been dynoed up to ~500 rwhp by the boys at RP. I suppose that for poopra owners that is prolly not enough, thus the need for dual walbros. That may not be a bad idea, but there is a big difference between one and two pumps.

 

yea and a ton of supra owners just add another stock tt pump
who wouldnt use a stock TOYOTA part which will last 250k miles over walbro? wtf is walbro in comparison. Ive heard of several failures as well

I'm using 1600s 850s and twin supra pumps and seeing 75% max duty cycle at 20psi and 17C intake temps lol

 

Let me tell you about screwing with the fuel system. I did mine "right", with minor modifications, tapping the ends of the rails and modifying the primary rail to accept 850cc sized injectors (milled it a bit, usw.)... I have had nothing but a headache for the last month, getting everything to seal right, etc, etc, so, if you have the opportunity to just "drop in" some larger secondary injectors, I would certainly go that route.