Injectors

[stephensimmons]

If my car has peak and hold injectors is it possible to run saturated injectors in it? If so how would i set it up? Im asking because i found a good price in a set of saturated injectors and wanted yo no before i buy something i cant use.

Thanks in advance.

[cygnus x-1]

If my car has peak and hold injectors is it possible to run saturated injectors in it? If so how would i set it up? Im asking because i found a good price in a set of saturated injectors and wanted yo no before i buy something i cant use.

Thanks in advance.


Yes, you can run saturated injectors. You need to bypass the resistor box and connect the power wire of each injector directly to switched +12V. Just make sure they really are high impedance (saturated) injectors, otherwise you will fry either the injectors or the ECU, or both.

Are you using these with a stock ECU? Even if they have the same flow rate they may not have the same opening time so the mixture might not be quite right. You really ought to have some sort of tuning control to run different injectors. Like a piggyback controller at the very least. Standalone or other chipped ECU would be better.


C|

[stephensimmons]

yes i do have the stock computer and i just got a apexi safc. Ill probley jusj spend a little extra and get a set of peak and holds to semplify things a little.

[cygnus x-1]

So I'm just curious; why are you replacing your injectors? Unless you have some fairly serious mods the stock injectors have plenty of flow. You can also get an adjustable fuel pressure regulator for pretty cheap if you just need to bump up the flow a little.

C|

[stephensimmons]

Well im going to up the compression around 11.0 port and polish the head stage 2 web cam or should i say there 2nd grind headers and exhaust and i think i have 240cc injectors so i wanted to go with 270cc injectors.

[89T]

you will be fine bumping the base fuel pressure, I have pushed 200 hp on stock injectors with boost.

[stephensimmons]

So i shouldnt replace them?

[89T]

That's up to you.
You have a better chance not blowing the motor than i did boosted.

[89T]

ok sorry let me get you up to speed.
stock injectors, 83mm 10.5:1 JE pistons................safc (1:1 fpr for boost)

[stephensimmons]

Well i guess i dont have to. Why you run such high compression if your boosted if you dont mind me asking?

[89T]

torque.
enough said! lol!

[stephensimmons]

Yea that would definetly do it!

[89T]

sorry for not answering you on PM's but i get asked that often and it's here if you look for it.

[stephensimmons]

Honestly i cant remember what i asked you now. I have so much suff going on in my head it takes me forever to sort it all out! im pretty sure itll come back to me though then ill find it sence ive figured the serch out on this sight.

[ShyBoyCA6]

hmm im learniing already haha sorry but taking a class about engine pro. just one ? still a lil noob here but how do you raise the compression on the motor?? cause im not sure if i wanna stay tuned up but might go with the turbo set up with 10psi

[stephensimmons]

Well its cheaper to shave the head down to get it. But if your going to boost then i would give JE Pistons a call!

[ShyBoyCA6]

alright thanks.

[stephensimmons]

I think if you shave like .040 thousands off you would be ether 10.0 or 11.0 compression with your stock pistons but i would have to look it up again to be sure. Any you can shave enough to get 11.0 compression just cant remember if its .040 or .080 thousands

[89T]

or you can buy b18a 10.5:1 83 mm pistons + bore

[stephensimmons]

Thats a new one! So will the b18a pistons mount on the stock a20 rods with no problem or do you have to modify something for then to work?

[89T]

b18a eagle h beams work aswell...

and no stock a20 wrist pins are smaller than the b18a's... i hate mis informing people..

In order to use the 83mm b18a pistons you need b18a rods also.

[stephensimmons]

So if i get the b18a pistons and rods they will drop rite into my a20 block and work with the a20 crankshaft? And my last question is do i have to notch the valve releifs any or not for the head?

[stephensimmons]

Oh and thanks alot for all the imfo!

[89T]

no you will need to bore the block also. 83mm
everything else is fine...

[cygnus x-1]

no you will need to bore the block also. 83mm
everything else is fine...


Even the valve reliefs? That's really cool then. I'm not ready to rebuild my block just yet so I'll be going the extreme milling route. With the later stock A20A3 pistons, 1mm off the head gets you 10:1. 2mm off the head gets you 11:1.


10.5:1 + turbo would be awesome. Lots of care needed with the fuel and tune though. What grade fuel can you run with 10.5:1?


C|

[stephensimmons]

You can run 93 octain with up to 10.7 compression but that would be the limit. After that you would need some addative. Now this is on a n/a engine. So if you boost with 10.5 im sure u would need some good fuel with some good additives (no cheap stuff!!!) and ob1 so you can control your timing because you would have to retard some under boost and a good fuel management! If im wrong will some one on here correct me plz?

[89T]

Even the valve reliefs? That's really cool then. I'm not ready to rebuild my block just yet so I'll be going the extreme milling route. With the later stock A20A3 pistons, 1mm off the head gets you 10:1. 2mm off the head gets you 11:1.


10.5:1 + turbo would be awesome. Lots of care needed with the fuel and tune though. What grade fuel can you run with 10.5:1?


C|The only difference in valve reliefs is the 4th one.
You can custom order pistons with only 3 reliefs for right around the same price.

I ran 91 octane fuel. We dyno tuned to 13.8 psi, with out any problems.
I am changing some things right now and i will be turning the boost up and I am switching to e85.



You can run 93 octane with up to 10.7 compression but that would be the limit. After that you would need some additive. Now this is on a n/a engine. So if you boost with 10.5 I'm sure u would need some good fuel with some good additives (no cheap stuff!!!) and ob1 so you can control your timing because you would have to retard some under boost and a good fuel management! If I'm wrong will some one on here correct me plz?

seems that you are doing some homework..

[MessyHonda]

You can run 93 octain with up to 10.7 compression but that would be the limit. After that you would need some addative. Now this is on a n/a engine. So if you boost with 10.5 im sure u would need some good fuel with some good additives (no cheap stuff!!!) and ob1 so you can control your timing because you would have to retard some under boost and a good fuel management! If im wrong will some one on here correct me plz?

i run 91 octaine with 10.5 comp...with no prob

[stephensimmons]

The only difference in valve reliefs is the 4th one.
You can custom order pistons with only 3 reliefs for right around the same price.

I ran 91 octane fuel. We dyno tuned to 13.8 psi, with out any problems.
I am changing some things right now and i will be turning the boost up and I am switching to e85.




seems that you are doing some homework..

Well ive built turboed 86-93 mustangs and worked on a 2004 GTO with the rear mount turbo system and ive built an tuned my brothers supercharged 2006 silverado. All of those vehicles had parts made to order for them from anyone u wished but not im working on the 3g its a little harder because not many part are avalible so you gota no what to use to make it all work. So yea i have been tryna do some home work after being outa school sence 1994!

[stephensimmons]

no you will need to bore the block also. 83mm
everything else is fine...

Ive been looking for the b18a pistons and i only see them in 81mm and 81.50mm standard bore size. Are these the rite one 89T? I know you said 83mm is that oversized or standard? :help:

[89T]

83mm is the correct size, try JE pistons....

they are way larger than the stock b18a pistons.

[stephensimmons]

Ok. I didnt no if 83mm was the stock size or not. So if its way larger than stock that means that the 81mm or 81.5 is probly the stock size so im looking at the rite b18a pistons then. I dont wana go no larger than i have to on the pistons I just want 10.5 to 11.0 compression so when i add my cam and port the head and other stuff i want it to respond well and not be lazy.

[stephensimmons]

Being I got my engine tore down can I put my 450cc blue tops in and adjust them to run with my apexi-safc? Im not boosted yet but would like to put them in while its apart or should I wait?

[Nio]

jesus i love this site. i learn so much.

btw i was always told that boosting on anything above 10:1.1 was rather dangerous? anyone carw to explain to me how you guys do it.

[stephensimmons]

jesus i love this site. i learn so much.

btw i was always told that boosting on anything above 10:1.1 was rather dangerous? anyone carw to explain to me how you guys do it.

With Very GOOD gas and proper timing control. And I do mean good gas and timing control! Now can I get my answer?!...............Then again never mind........Ill jus do it like I should have done in the first place. And by the way, where I live I can get up to 116 octain fuel and I can use a boost controler to turn the boost down to about a pound or two went I dont want to buy that stuff because its rather exspensive and just run off motor.