Hi everyone, this is my first time EVER owning a honda. I am more of an audi/bmw guy. But for starters I am the very proud owner of a 1995 honda del slo..haha. It is a b16a2 swap and it has 255cc stock injectors. I have a set of 355cc injectors to go on it...my question is how do i install the injectors and does the ecu have to be retuned after i replace the injectors with the bigger ones??? It is currently tuned on chrome? And the stock injectors are currently at 75% which the previous owner told me is ok if it doesnt go past 80% but the new injectors will be able to push much easier. If you can help me I would appreciate it so much!! Thanks everyone and I am glad to be part of the honda community

 

fyi, stock injectors are 240cc. and yes you'll need a retune with bigger injectors.

 

Thanks for the correction! So what should I do? The guy who owned it before me tuned it on chrome....If I was to swap out the injectors what would be my next step??

 

first of all, what mods are done? bigger injectors wont do anything if the current one's are working fine.

 

Well if im not mistaken...the following:
Megan long tube header
Aem fuel rail
Aem cold air intake
Crower cam
Port and polished heads
the pistons have been changed somehow (im sorry im not sure what exactly)
68mm throttle body
american vtech solenoid?
and a few other little things im sure im missing...Like i posted previously I am NOT a honda person so most of the stuff i know about the car is like japanese too me so please disregard any non sense I say that i might not know for sure.

 

dont worry i did

if the current setup is running fine i wouldnt bother replacing the injectors

 

well a friend of mine works on cars ALOT along with his dad and they both told me that the car is running rich? It doesnt smoke unless I crack vtech and that is around 5500 and they say you can smell gas when I get on it hard. Would it really not make a difference to swap those injectors out?

 

another fyi, it's vtec

bigger injectors will run a lower duty cycle at a given rpm. will you gain power? maybe, maybe not. if it's running rich it's because the tune is rich. if you're not tuning it yourself you have to factor in the cost of tuning which can run anywhere from $150-200/hr or $300-400 for a complete tune depending on the shop.

 

Ok well its a p30 tuned on chrome. Should i just leave it alone and say screw it or? I mean I practically have every bolt on I can get to get more horsepower. There really isnt much more I can do with getting really into it which would not be safe with me lol. the compression on it is like 10.9-1

 

if you're intent on running them, wait until you do some other mods and tune it all at once.

 

Well I dont believe I will be doing any other mods. I just wanna know if the tune or map that is on my ecu is safe enough for the injectors im running right now. If its not gonna hurt my engine running chrome or my injectors at 75% then im not gonna worry about it.

 

if its running rich wait until you have the money to get it tuned then swap the injectors and get it tuned

 

Well I have the money to get it tuned now. The 355cc injectors came with the car when I bought it. My main concern was if the engine would mess up using the current tune/injector combo I am using now

 

If your running rich already those bigger injectors wont do anything to help you. I would get tuned to run what the car has on it already. I would take what the previous owner has said and forget it. He most likely tuned himself.

 

You don't need bigger injectors. Bigger injectors will flow MORE fuel so if you're already running rich and DO NOT retune...

 

Ok well thank you all for the advice and information. I appreciate it a lot!

 

I wasn't very clear I guess as far as the injectors if you are running rich in vtec than more than likely you don't need them, OP sounded pretty intent on putting them in, but whether you put them in or not if you already running rich you already need a tune

 

Rule of thumb: If you add any part that will change the AFR, you will need a tune, and retune everafter

 

Jesus. Go get your car tuned by a professional. Bring the injectors. If your tuner decides you need them, you can swap them in. I'm guessing you won't.

I ran stock 240s on my 2 litre ls/vtec at almost 12:1 compression, with just the FPR cranked up. I'm pretty sure your B16 with bolt ons will be just fine.

 

the 255s should be plenty for that motor. Get them cleaned and flow tested if you don't want to run stock. At a certain point, you start having more issues idling and running consistent AFRs, though I think that's closer to the 800cc range.


Cranking the FPR up is not a good idea. Increasing the fuel pressure above stock makes injectors have to work harder to open and can make them fail. I have a turbocharged engine and run a stock FPR. Just get proper size injectors and run stock fuel pressure. The only exception is if you run Siemens or ID/Bosh, that design can take higher pressure I guess.

 

Well my biggest concern about tuning is idk where to go or even if i can get it tuned. It is a p30 that the original owner tuned on chrome. It takes like 10 minutes for me to start it and get it running. He said that it has a rough cold start and he wasnt kidding. I can start it and it will die instantly then i can start it again and it does the same thing. Then it will keep turning over but won't start. I have to wait a few minutes then start it again and then i can actually get somewhere with it if i keep the rpms at about 1 1/2 or 2 until it gets pretty warmed up. Other than that it does alot of ramping too. I live in east tennessee and don't really know where i can take it to get it tuned

 

Edge Automotive.

 

OK so all i need to do is drive the honda up there and ask them to tune it???

 

You'll have to pay too, but yeah. It's that easy.

 

HAHA I figured that much! Well Thanks everyone for the help! After all the discussion I don't believe it is going to matter as I think my engine is about to blow up anyway! after 5 days of having the car :'( it has an excessive blowback and if I'm not mistaken it is smoking quite a bit when i rev it up. But I will have to check again in the morning when it is warmer. It smells like oil though but it could just be steam. Not sure gonna be really sad to see it go if it is about to blow up...