Difference between the 255 and the 190 Walbro fuel pump - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 11-01-2006, 05:56 PM   #21
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Originally Posted by fatty View Post
...do i also need to get an afpr with a megasquirt?
I'm probably going to earn a(nother) handslap, but no, you don't want any sort of FMU/RRFPR/AFPR or other fueling bandaid with MS. You may need to substitute a higher pressure regulator to get enough flow from the injector though.

I suppose there might be some fun to be had with higher PWs at idle and therefore better resolution, but I'd just get the right size injector for your HP goal and go from there. You can get pretty good idle resolution by fiddling with the squirts per cycle, etc.
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Old 11-01-2006, 06:10 PM   #22
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thanks guys.

braineack, i'll re-read your faq and try to get my head around it. but i think i'm starting to get a grip on things.
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Old 11-01-2006, 07:24 PM   #23
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yes you can do alot on the cheap by just running more FP. look at andy floyd 300whp on 300 cc injectors and stock ecu. alot of us do it but ultimatly it is alot claener and mroe flexible to go with something that can run injectors akin to your power goals. also i noticed my idle pressure has gone up to about 45 and fluctates to 48 or so psi at idle ocasionally with my 255 fitted. once i throw in the 460's it should drop a couple of psi esp if i can get it to run. for 8 psi pon the smallish turbos we run the 1.8's + extra FP should be fine even at 12 psi. but a ms can run huge injectors so your only concern there will be how much the injectors cost and cooling effeciency
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Old 11-01-2006, 08:27 PM   #24
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Originally Posted by kyle242gt View Post
You may need to substitute a higher pressure regulator to get enough flow from the injector though.
just thinking about this... is the regulator from the 1.8 engine a higher pressure unit, or the same one? could it do the job?
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Old 11-01-2006, 08:31 PM   #25
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it is totally different, and wont fit the 1.6 rail. you need a aux regulator that raises the fp dependent on boost. say 12-1 or 4-1 depending on your fueling needs and resolution. there are adjustable fprs on the market from begi etc. as well as several cheapo single rate units that can be custom rebuilt to meet your specs.
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Old 11-01-2006, 08:35 PM   #26
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Originally Posted by magnamx-5 View Post
you need a aux regulator that raises the fp dependent on boost.
Are you sure he should run an RRFPR with standalone EMS?
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Old 11-01-2006, 08:50 PM   #27
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i guess i could just get one of the new multi role begi units:

"Multi Role Regulators
The new Multi Role regulator from BEGi is designed to provide complete adjustability to your fuel injection pressure. The MR series takes all of the features found in our rising-rate regulators and adds the extra functionality and convenience of allowing you to adjust your base fuel pressure (the fuel pressure at fuel rail during idle conditions). This allows you to replace your factory fuel pressure regulator with a fully adjustable, easy to mount, single unit.
Patent Pending

Price $309.00 (Fittings included)"

not cheap tho
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Old 11-01-2006, 09:14 PM   #28
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how about a combo of the walbro 190 HP and this aem regulator... ?
http://shopping.lightningmotorsports...cat=717&page=1

says it's a "universal" regulator... reckon this will work in the miata ?
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Old 11-01-2006, 09:39 PM   #29
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All I can say is, figure out if there is any reason for a RRFPR. If you do, please post back, because I just don't see it.

Then find out what the OEM FPR is and if it's suitable for your injectors and your power goals.

Skip the mad tyte JDM nonsense. There is plenty of stuff in the JYs that can be retrofitted.
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Old 11-01-2006, 09:45 PM   #30
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ok thanks. just that everybody seems to say that the oem fpr can't handle the pressure and will fail.
so as you say there is plenty of stuff that can be retrofitted (but what do you mean by JY's sorry) , i just need to find the best / cheapest option.
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Old 11-01-2006, 10:19 PM   #31
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i figure once he went ems he would just run bigger injectors the fp tricks are just ways to work around the limitations of the ecu you are using. the ms is your cheapest option esp since you seem to be handy with a soldering iron get that and some 500-600 cc injectors and be set to make 300 whp on the stock fp and system. for 8-12 psi the stock ecu and cheapo fpr will suffice. but the ms given good tunning and setup will give an ultimatly better ride and control it just scare alot of people like me who dont like ot go poking around where the space is so limited on electronic solutions or solder on circiut boreds. it is all in what you have the skill for.
Also the aforementioned aem fpr will only allow the adjustment of base pressure so it is no more usefull than your stock fpr unless you are runnig a 255 hp and need more flow to keep the pressures down at idle.
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Old 11-02-2006, 08:05 PM   #32
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hey guys i've found some high imp. 460cc injectors from a '88 rx7. the wire harness is a different shape to the miata ones, but i don't imagine it would be a big job to fit them onto the car?
reckon these would be a good way to go? i'm just a bit worried about going any larger, in regards to how the car will run at low rpm / idle etc. ? is this a silly concern, should i just keep looking for some 550cc's ? ?
finally, do these puppies fit ok? it seems others have use them in the miata.

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Old 11-02-2006, 08:11 PM   #33
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Holy **** dude, are you just grabbing parts? 4x460cc = 300HP at 85%DC. I'd be worried about getting the right idle resolution. 550's would make it even worse.

Why not get MS and WB running on your 1.6L in NA, then see how much room you have? Start slow, up the boost a bit, and then increase pressure or injector size.

I'm all for gathering parts up in advance, but you really aren't going to jump right to 300HP.

You really should use the smallest injector you can, without overdoing the duty cycle. And even then, heck, I ran 4x300ccs at 110% DC for a while with zero adverse effects.

From http://www.megamanual.com/v22manual/minj.htm#size
"Injectors that have too large a flow rating will make it difficult to tune the engine at idle and cruise."
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Old 11-02-2006, 08:18 PM   #34
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hey the ms can run 800 cc injectors no problem it is one of the most versatile engine managment systems out there hell i hope to run those very same 460's with just a rx7 afm and safc if i can get low impedance injectors ot run pon just the rx7 afm then the safc in the mix i should be able to get the 460's to run just fine throw in 80-90 psi of fp and i have all the fuel i will ever need for this tubro anyway. now all i need to do after i get it figured out is find a better rear end and a six speed. your bigger injector notion is only true when you are limited by ems a ms is not limited a link is limited to about 600 or so a emanage blue 330's and an ultimate has no real limit that we have seen so far on it compensation. as do the tec3, hydra, etc. heck markp runs 800's i believe with his tec3.
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Old 11-02-2006, 08:20 PM   #35
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hey man, yeah, i am just grabbing parts :lol:
but i did check with my megasquirt guru (aussiedriver) when i was looking at some 550's and he reckoned that things should be ok , that the idle tuning might be "interesting" to use his words, but would be ok.
hmmm. but yeah maybe i need to slow down a bit eh ? ?
i already have some 230cc's sitting here ready to go, maybe i should start with those like you said.
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Old 11-02-2006, 08:27 PM   #36
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Quote:
Originally Posted by magnamx-5 View Post
hey the ms can run 800 cc injectors
Hi Magna - it's not a question of what MS can do, it's a question of how much fuel his car is going to drink. If you go too big, you can't get the idle pulsewidths low enough for a stable idle, ditto for lean cruise. Running static fuel pressure has its drawbacks, I suppose. Still waiting to hear if anyone actually runs a RRFPR with MS....?

Quote:
Originally Posted by fatty View Post
hey man i am just grabbing parts :lol:
but i did check with my megasquirt guru (aussiedriver) when i was looking at some 550's and he reckoned that things should be ok , that the idle tuning might be "interesting" to use his words, but would be ok.
hmmm. but yeah maybe i need to slow down a bit eh ? ?
i already have some 230cc's sitting here ready to go, maybe i should start with those like you said.
Hee hee! 4x300's got me to ~220HP (modest guess) at 100% DC, and 4x400's did the trick at 85% give or take. Just get'r'done, then drive it. The DC gauge will tell you when you need more injectors.
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Old 11-02-2006, 08:37 PM   #37
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ms has done it on other miatas as well though that is all i am at. heck cccpull runs 650's with a clocked ecu, rx7 afm, and vafc. it has been done why limit yourself on fuel when it has been established it can be done. i dont mean to argumenative just throwing my opinion out there. fatty if you like the idea of cutting the and splicing the injector clips the 460's and MS should work. and like i said before if i get enough time i should be running 460's by sunday.
We'll see. ohh yeah btw the stock clutch is only good for about 150 or so whp.
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Old 11-02-2006, 08:38 PM   #38
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woops, my hand slipped on my keyboard and i accidently bought them

so i guess i have 2 sets of injectors to play with now

i'll start with the 460's and have the 230's as a backup, in case i can't get the idle and cruise sorted out.
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Old 11-02-2006, 08:40 PM   #39
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good luck
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Old 11-02-2006, 08:40 PM   #40
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yeah man i know the clutch issues. i will be getting a 1.8 clutch and flywheel (maybe an aftermarket cro molly fly, not sure yet).
then the brakes...

then the diff...

and so on and so forth
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