hello, i have a b17a1 in the building process i have b16b pistons, skunk2 alpha series valves, retainer and springe, skunk 2 pro series stage 2 cams and i am running a 13.3:1 compression what fuel upgrades would i need any help yould be nice i already have a fuel rail with a stock regulator and stock fuel pump and stock injectors

 

13:3:1 ? I hope you're not planning on using standred pump gas(93/94). may want to look into some DSM injectors, adjustible FPR. other that that you should be ok with stock pump and rail.

 

I had 12.5:1 with full race cams in my old b20a and ran a stock fuel pump, stock fuel injectors, and 93 octane, revved to 8500.

But that was a non-vtec motor. Bigger injectors could be a good idea.

Sounds like you're obd1 -- tuning with Crome? I'll bet that stock injectors are fine if you're only going to 8000rpm. You'll be close to 100% though on them (240cc IIRC).

 

12:5 is the cut of where 93/94 should be used. you do realize that 13:3 is "high comp" E85 would be best. with that set up I'd think the drop off would be somewhat higher than 8k seeing as the stock b18cr hp cut off is at 8k. read his set up.

 

There are a lot of things you can do if you pull timing but what kind of octane is 13.3 actually going to need to make power? I don't think there's much of a point of doing 13:1 and sticking with gasoline. Why not just do 12:1 and make the same power?

But to answer OPs question either way the stock stuff won't be enough, especially if you're ever planning on using E85. For gasoline you'll need bigger injectors. For E85 you'll need injectors, pump, and maybe FPR as well (not sure about this last one).

 

sounds like you haven't researched much before jumping into this. u will need injectors and a fpr. stock pump is fine


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nope, thats why im here teggy and i have no problem running e85 the valero up the road sells it and i would have to e85 with 13.3 and i have to have a fuel pump and injectors a adjustable fpr any suggestions on the lph on the fuel pump and what cc injectors

 

Anything over 440cc is overkill and will not be needed. as for pump a wally 190lph would work again 255 is turbo territory/higher all motor

 

I disagree with some of the above. With E85 you need a lot of flow. And the idea that large injectors are "overkill" is not really true anymore. Lots of pump-gas all motor guys use 1000cc ID injectors even on 200 whp builds. The technology has improved a lot even in the last 5 years and the spray pattern of a 1000cc ID injector is so good that it has benefits even at very low duty cycles.

Look at most high compression all-motor builds and you'll see the following: Walbro 255, ID 700 or 1000 injectors, and sometimes 60 psi FPRs. I think a walbro 190 might be OK but a 255 might be better. Not sure where it runs out of steam with E85 but I'm guessing that the 190 will be working pretty hard at 250 whp.

Anyways all these are questions your engine builder should know the answer to. And if you have to ask questions like these you better have a good engine builder & tuner or I promise you that 13:1 engine won't last long...

 

I'm with Gagnar on this.
ID injectors are awesome. Even when massively over sizing them, they still can idle perfect. From what I understand (for boost though) you typically want a bit more than 50% larger injectors for E85 as you would have with pump gas.

13:1 is very high for a street engine though....and again, without a good builder and tuner, that thing is as good as a ticking time bomb.

 

When it comes to injectors, as long as it gets tuned, there is no such thing as overkill.

 

Alright well I was told bigger than stock was overkill for my set up when I was looking into new injectors...but I didn't have money to get it tuned at the time.

(bolt on's+tuner 2's+.015)

 

You still hear people saying it a lot. I think it used to be true, or maybe still *is* true with the RC-style injectors. It's just that the Precision and ID injectors function well at all duty cycles and can be over-sized without negative consequence.

 

this is very helpful my ecu is already socketed and has a sst chip in it i was planning on ordering a new chip with a custom basemap on it which they provide and make as long as u tell them your build specs like what cams injectors ect. would that be good or would we need a dyno tune and i dont know anyone who does dyno tunes for obd1 ecu's that are chipped.

 

thats why im going with the pre programmed basemap chip that they program and send to you

 

basemaps are for getting you to the tuner. you will still need to get it tuned.

 

the website that offers it is xenocron tuning and il post the link

 

http://www.xenocron.com/basemap-chip...tom-p-279.html
thats the link for the custom basemap

 

and what do you think a good 2 step would be as far as rpm?

 

for ***** sake man. do you know what you're doing? are you just buying stuff because it's what somebody told you to buy but you have no idea what it does?

 

no one told me to buy anything most people here are friendly here if you dont like it dont reply to the ******* post *****

 

the fourms are for help to to get nagged on

 

The forums are for help AFTER you do your homework.

Do you know what a 2 step is for? If you did, you wouldn't ask what RPM to use. My setup could need a 2 step set at 5600rpm, someone else might need it set at 4000rpm. It's different for everyone.

Running 13.3:1 on a basemap??? HAH are you kidding me?! I would never run ANYTHING on a basemap unless it was to just limp it to a dyno tuner to have it fully tuned ON A DYNO.

having some shop make a basemap using rough assumptions as to how your car will run with the parts you have is the worst thing to use to make power and reliability.

You come in here saying you want to run some hot 13:1 NA engine, yet it sounds like you know jack squat about doing so, and haven't even done the research needed to build something of that caliber.

Forums aren't for ******* spoon feeding you every bit of information you need.

Were you born in a silver cradle with a mother ******* silver spoon in your mouth? You're on the ******* internet. DO SOME ******* HOMEWORK.

 

Abort mission! Eject! Say goodbye to all that money wasted, I mean invested. Smells like blown engine in here...

 

310cc will suffice on gasoline, maybe as big as a 440cc if you're running e85....There's no need for an upgraded fuel rail or FPR, but if you have them, keep them. As for a fuel pump, a Walbro 255lph will do the trick. I would recommend talking to Phearable or Xenocron (google them if you cant find them in the marketplace), and get a basemap. After that, tune and you're done.