will not boost

[midnightsliding]

well this is not for me its for my friend and he has made some homemade kit for his CRX and everything looks right to me but it will not boost i dont know what to tell him, so i thought that i would turn to you guys cuz honda owners suck? the turbin spins at an idel and the wastgate is closed? i dont know what to tell him im lost i dont under stad why is will not boost? any sugestions plese feel free to givethanks

[TrunkMonkey]

need more details.

how the the car perform when it's driven?

-demetrius

[midnightsliding]

well it used to be a fast stock CRX he ran a 9.7 on street tires with nothing doine its just really lights, but he had the kit on and i went over their and checked it out and everything looks right we took it down the street and full throught it fellt like poop it felt faster with out the kit on their, but it would not go in to boost, he has two broken exhaust studs on the far ends of the head, but other then that i can find anything else wrong and ideas?thanks 4 yalls help

[SloS13]

It would help to know what he's got exactly.

Could be - bad case of fuel supply. Either waaay not enough to support boost or waaaaay too much, bad leak or a problem with the turbo or wastegate itself. Off the top of my head those are the only possible problems

[j-z]

lol honda owners suck? ok... make sure he doesnt have a boost leak anywhere. check coupling connections. what kind of wastegate is he running? is it building no boost at all? or just a little bit of boost and it takes a while to build it? or he does boost and it just runs ****ty? give us some more info to work with man.

[midnightsliding]

well he has 450cc DSM injectors i think thats a lil too much for an 8psi, but he siad everyone eles runs those but it acts like it dont wanat to idel, and he is running a stock 1g DSM turbo with internal wastgate that is suposted to run 8 psi. so cold too much fule be a proble that would caz it not to boost? like slos13 said?thanks

[Structure240sx]

did he tune the ecu for those injectors? that would cause a bad idle with way too much fuel beign dumped in. if it still revs tho it should boost jsut not make as much power if its really rich. maybe the wastegate is stuck open

[C-Kwik]

If he has too much fuel, the motor would probably stall out and foul the plugs before he could even get the revs up high enough to boost. How's the car feel when driving around? Other than the fact there is no boost. Does it feel like a normally-aspirated car for the most part? I might suspect a major boost leak. Hondas use MAP sensors, so any leaks would be undetectable as fuel ratio changes. The motor would just think it's running N/A. If the exhaust manifold was leaking, you'ld hear it. If the wastegate is stuck open, it could depend. But you said it was closed. I am assuming here you checked the position of the actuator arm to determine that.

[midnightsliding]

yeah well he took 50% low throttle out and 35% high throttle. yea it feel like NA now when he drives, were going to try to replace the exhaust gasket tonight i think hes got a signeificant leak around their so well see what happensthanks

[j-z]

so hes running the afc hack then? thats a good cheap reliable setup. it wouldnt be the exhaust mani gasket. my money is on the wastegate, something isnt right. can you answer the qustions i asked you up ^ there so i can pinpoint exactly what it is.

[C-Kwik]

If it's an exhaust gasket, you WILL hear it.

[Structure240sx]

it will sound like ups truck or worse. like running open headers

[SloS13]

I bet you could just be freaking out the MAP sensor? What are you doing about that?

[midnightsliding]

he put one way check valves on it, and it read the highest is has gotten is -35 on his SAFC.

[j-z]

your not suppose to run check valves. take those out. with running the afc and the bigger 450 cc injectorsyou lean them out to trick the map into seeing boost. when you lean the afc out it changes the voltage from the map to the ecu and it allows it to see a lil bit of boost. with 450 cc injectors you can run about 11 psi before the stock map goes whack. i sure hope hes running a higher flowing intank pump. just tell him to take the check valves out. and you still didnt answer my question...

[midnightsliding]

yeah i told him to take the check valves off but now it builds boost in 3,4,5 geard, and i think now its either a wastgate or still and exhaust leak somewherebut yeah i never herd of the check alves on their with SAFC either so i took them off and now it built a lil bit of boost but not 8psi like the wastgate is suppost to run

[huguetpj]

A friend of mine who has turboed a few Hondas says that the check valve helps out with the idle... for whatever reason that is. He told me that since the stock MAP is a 1bar MAP, which I'm guessing refers to absolute pressure meaning the sensor can't read anything above atmospheric, when it sees boost the ECU goes crazy. So I wouldn't remove the check valve. But that -35 on the SAFC seems weird. What do you mean this is the highest it has read? What reading is -35 (I'm guessing vacuum)? If so, either the SAFC is incorrectly configured or the check valve is installed the wrong way or something cause you should be reading at least 0 PSI. Maybe I'm just way off since I mostly know about MAFs :pface

[SloS13]

If installed correctly, the check valves wont alter the reading that the MAP gets until ~0psi

BTW - I had a turbo honda and ran check valves.

[midnightsliding]

well yesterday i told him to take the check valves off and we took it down the street and in 4th gear the SAFC read +7 in the intakemanifold, and the boost gauge reaad like 2 or 3 psi in 4th gear .

[j-z]

yeah dont run the check valves. if yall understood how the hack works then youll say to take them out. i for one totally understand how it works and it works without using any sort of check valve leading to the map. and the -35 this guy is talking about is the fuel curve setting. he leaned it out -35%

[midnightsliding]

hey guys dont worry he fixed it now thnkas for ur help. now it preety fast now for a honda'thanks

[huguetpj]

So what was it? Any idle issues without the check valves?

[midnightsliding]

he took the check valves off, and fixed the exhaust leak, i figured it was the exhaust leak.. so now it is running fine thanks

[j-z]

it was the check valves

[huguetpj]

Why would the check valve(s) prevent him from boosting? I'm betting on the exhaust leak, cause I've had exhaust leaks preventing me from going past 1PSI.

Glad he solved it

[midnightsliding]

yeah im real sure it was the exhaust leak he had cuz he fixed and and called me and said that it boosted up to 10psi.