Progress Thread Budget 89 GT

a91what · Jul 3, 2019

Oh your definitely out of pump... or something is wrong with the regulator, you should have a rise in fuel pressure under boost.

Anti_Hero0932 · Jul 3, 2019

ok.... ill try a pump first. at full boost t should go to 45 i would think since there wouldnt be any vac.

i was reading through my manual last night trying to remember if i could only use low or high impedance injectors on the microsquirt

a91what · Jul 3, 2019

http://www.msextra.com/doc/pdf/Microsquirt_Hardware-3.3.pdf

page 36 they would require resistors or a seperate peak and hold driver...

now if your pressure is dropping with boost then the injectors are working overtime to supply fuel. if you have 40psi at the rail with 10psi of boost then the injector is only spraying 30psi worth of fuel, making them act much smaller.

Anti_Hero0932 · Jul 3, 2019

alright sweet. so if need be i can use the ford racing 60s or something if it ends up being the more expensive problem. id just have to buy a harness adapter

Anti_Hero0932 · Jul 3, 2019

ordered my aeromotive 340lph pump and emailed mallory tech about the brass stud for my regulator

a91what · Jul 3, 2019

Nice, my 393 will be hungry so i am waiting to see how this works out.

Anti_Hero0932 · Jul 3, 2019

ive seen some people run a 450 or twin 450s and make their own hat for the stock fuel tank before. i shouldnt need all that tho.

maybe one day ill get a 351 and make some big power.

i think on3 sells and aftermarket hat as well

stanglx2002 · Jul 3, 2019

Anti_Hero0932 said:
ive seen some people run a 450 or twin 450s and make their own hat for the stock fuel tank before. i shouldnt need all that tho.

maybe one day ill get a 351 and make some big power.

i think on3 sells and aftermarket hat as well

They do but you have to use the 03-04 cobra tank to use it. They have a different hat for triple fuel pumps.

Anti_Hero0932 · Jul 8, 2019

Anti_Hero0932 · Jul 8, 2019

Two differences I see already. The size of the inlet is about triple the size.... and when you turn the key to prime the pump it’s soooooo much quieter

stanglx2002 · Jul 9, 2019

I hope this addresses the fuel psi issue that you were having. Then you should be getting some more bandwidth out of those injectors.

Anti_Hero0932 · Jul 9, 2019

ME TOO!! time will tell i didnt get it done till 10:30 last night. i had a bunch of stuff to do after work.

ill try and drive it maybe tonight and see what it does.

a91what · Jul 9, 2019

Likely you will be pulling fuel out up top.

Anti_Hero0932 · Jul 9, 2019

I hope so. in the perfect world id like this car to see 12# and climb the RPM range smooth

i just cant believe how quite the pump is thats nice.

Anti_Hero0932 · Jul 9, 2019

Yep. Taking lots of fuel out of the topish..... 8 percent some places around the 3800rpm mark in boost up too 5k

a91what · Jul 9, 2019

Good, problem solved then.

Anti_Hero0932 · Jul 29, 2019

getting everything ironed out again...

now im looking into c4 swaps.... i dont really like auto cars but it seems like it would be and upgrade if im looking to go faster in the 1/4. right now im losing a lot of steam in between gears....

anyone on here switched from manual to auto that can chime in?

Anti_Hero0932 · Aug 7, 2019

@a91what can you look at these and tell me if you see anything weird. car runs really good. at about 4800 and up it starts to break up almost like a fuel problem. only other thing i could think of is like a valve train problem? thing is a monster now.....

wondering if the injectors need to be swapped. i already swapped the pump like we said. looks like it asking for some fuel mid way in the rpm range when i hardly ever drive under boost. didnt want to touch anything till you looked at it.

CarMichael Angelo · Aug 8, 2019

Anti_Hero0932 said:
getting everything ironed out again...

now im looking into c4 swaps.... i dont really like auto cars but it seems like it would be and upgrade if im looking to go faster in the 1/4. right now im losing a lot of steam in between gears....

anyone on here switched from manual to auto that can chime in?

What are you looking for? It's like you've said already. Itll be faster when you dump the manual trans.

Anti_Hero0932 · Aug 8, 2019

ive already figured out the C4 part of it. ill probably wait till this winter to do that. might have converter questions at some point. right now im just trying to figure out why this car is still breaking up at the top end of the RPM range. wondering if its injector or something or if im floating valves or what. im wondering if i need to move to 60# injectors now..

Progress Thread Budget 89 GT

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my rearend will smell so minty fresh,

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