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What Maf, Injectors, Fuel Pump, Tuning?

  • Thread starter Thread starter Calypso Cruiser
  • Start date Start date Feb 13, 2016

Calypso Cruiser

New Member
Nov 11, 2013
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Calgary
Feb 13, 2016
#1
  • Feb 13, 2016
  • #1
So I'm swapping a built 351W into my '92 fox hatch. I've got a pretty good handle on what I need to put the engine into the car and fit it to the T5, (minus the flywheel, looking for a neutral balance flywheel that will fit).
Besides that I'm not exactly sure what MAF, injectors, fuel pump, regulator and tune I should go with?
The engine is a bored and stroked to 393 using a scat kit, will have a cam that should be good from 1500-6000rpm, can get specs if that helps, heads will be performer rpm's with the 2.02 valves, FFRP tubular upper intake with a lightning lower intake plenum, probably 75mm TB.
I'm used to speed density set-ups on older fuel injected engines, I quite understand the MAF/injector sizing. From what I've seen 30 lb. injectors and MAF for them should be about right for my engine combo, I figured a 255lph pump, probably BBK fuel rails and fuel pressure regulator. Does this make sense? Do I still need a tune for my stock computer?
Or... ditch the MAF and get the injectors, pump, rails, regulator and a stand-alone fuel injection system. I know this route is more money now but being able to change things or add boost down the road is nice.
Any thoughts? Anything I'm missing?
Thanks in advance
 

stykthyn

I want to measure mine. It doesn't look that tall.
15 Year Member
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gainesville
Feb 13, 2016
#2
  • Feb 13, 2016
  • #2
Go with pro m for your maf or just do the stand alone. Either set up will be good for you.
 

Grn92LX

Fidanza Man!
Founding Member
Jan 14, 2001
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129
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Feb 13, 2016
#3
  • Feb 13, 2016
  • #3
You are putting heads and an intake designed for a mild 302 on a 393. I would save the money on a standalone system and put it towards a better induction package. 30's should be ok on that set up as is.
 

mikestang63

SN Certified Technician
Aug 27, 2012
11,606
8,859
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In the garage
Feb 13, 2016
#4
  • Feb 13, 2016
  • #4
you should get at a minimum TW or AFR 220 heads.
 

Gearbanger 101

Straight Outta Locash
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Aug 10, 2002
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Feb 13, 2016
#5
  • Feb 13, 2016
  • #5
You're gonna need to tune that thing no matter what heads you put on it. Keep your options open. Tweeker, Moates, PMS, etc....probably your least expensive route. That said, I agree with the others. The Performer RPM isn't nearly enough head for a 393. If you insist on sticking with the Edelbrocks, look into a set of Victor Jr's. If you never plan on going with a power adder, go with a set of 30's and at least a Pro-M 80mm. And for the cost, you really can't beat a 255lph high pressure pump.
 

A5literMan

At least it is lumpy...
5 Year Member
Jul 30, 2011
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Feb 14, 2016
#6
  • Feb 14, 2016
  • #6
If you're just going to use the parts you listed then a 80mm pro m and 30's will work but the 30's are on the small side. I'd go with 42's as is and if you plan on a power adder or a better topend, I'd go to bigger(60's-80's depending on what you're doing). Problem is your entire topend parts are to small. That intake won't let that motor make any power above 5k. The heads are a choke point also. The combo you are designing is a torque monster. Would be perfect in a truck. Also you're going to break the T5. It will not last long.

What are your intentions/desires for this motor? Right now you'll probably be around 375- 400rwhp and 450rwtq. If you add a better topend you'll see an extra 75-100hp and slightly more torque. I'd use at least a 205cc head,a better intake(tfs r box,super Vic efi or Vic Jr efi intakes), a 90mm throttle body and a 4"cai. With those mods I'd add bigger injectors. Probably 60's. Anything above 30-36# injectors will Definetly need a tune(for maximum driveability and power you need one anyway). You also need a good exhaust system. 1 3/4-1 7/8" long tubes and 2 1/2" exhaust at a minimum. You also mention going with a neutral balanced flywheel. Is your motor neutral balanced? Most 393's are 28oz.
 

Calypso Cruiser

New Member
Nov 11, 2013
17
1
4
Calgary
Feb 14, 2016
#7
  • Feb 14, 2016
  • #7
Ok so heads are already ordered, intake is going on because I like the look and I have it. In the far off future I'll upgrade the intake and maybe a stand alone set-up too. For now probably a MAF setup. Just wondering which to go with. Reliable Street car only, probably will never race it. 1 3/4" long tubes I figure, those bbk's are easy to get. I've had pretty good luck with BBK parts so far. Pro M is nice stuff too.
I'll be nice to it to keep the t5 alive but I know I'm kidding myself.
The scat rotating kit is internally balanced too, thus finding the flywheel is tricky, just try harder I guess.
Now for tuning is the sct chip good enough? Don't hear much bad about them.
All the parts I have now can easily be sold in the future and still make a few bucks. I havent seen good heads and intakes for sale used in about 6 months. Slim pickings where I live.
Anyways thanks for the input.
 
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