no boost yet and car is not tuned but I have a setup for boost trying to figure things out..

I have 8.5:1 pistons my F.P. is reading 46 at idle at stay there when I accell

car sputter when I hit vtec and theres is no accelration at that point what might be the problem????????

 

No codes I take it ? Check your tps settings, just for the heck of it.

 

one code but its for the speed senor dont know if that has anything to do with it or not.... how do you check tps settings??

 

what size injectors?? Your probably running hella rich when u hit vtec...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GSE980 &raquo;</TD></TR><TR><TD CLASS="quote">no boost yet and car is not tuned but I have a setup for boost trying to figure things out..

I have 8.5:1 pistons my F.P. is reading 46 at idle at stay there when I accell

car sputter when I hit vtec and theres is no accelration at that point what might be the problem????????</TD></TR></TABLE>


your cars not tuned! and did u disable the speed check in the Engine management system u r using? if u didnt u wont get VTEC.

stop beat n on ur car and get it tuned before it goes kaboooom

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GSE980 &raquo;</TD></TR><TR><TD CLASS="quote">one code but its for the speed senor dont know if that has anything to do with it or not.... how do you check tps settings??</TD></TR></TABLE>

theres your problem right there!
Vtec needs 3 things in order to work properly
1. Oil Pressure
2. RPM's
3. Speed

 

roger...I have a wideband so what are they going to do that I cant with a VAFC and a wideband controller

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GSE980 &raquo;</TD></TR><TR><TD CLASS="quote">roger...I have a wideband so what are they going to do that I cant with a VAFC and a wideband controller</TD></TR></TABLE>

lol did i just read that right? a VAFC? hehehe

 

lol I know right I laugh everytime I see it.... I mean why have 1, I should just spend a G on a EMS that does the same thing right...

 

You need a wideband oxygen sensor and a tunable ems such as hondata, ectune, neptune.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GSE980 &raquo;</TD></TR><TR><TD CLASS="quote">lol I know right I laugh everytime I see it.... I mean why have 1, I should just spend a G on a EMS that does the same thing right...</TD></TR></TABLE>

Or you could just buy an OBD1 ecu and tune in on Crome....that wouldnt cost any more than a VAFC. If its untuned, the crossover could be very rich. Also the problems with the speed sensor could be causing it. Be sure to check your oil as well...dont overlook the easy things

 

I have Neptune and a INOVATIVE wideband sensor but am running a chipped p28 right now. I mean like how much TUNING do you need to do for a non boosted car you should just right with the proper fuel at 10%-80% throttle correct which can be done with a VAFC and a wideband

 

Vafc doesnt allow for fuel trims to be adjusted like they do with a EMS. it just goes by percent. and you cant adjust anything since you have Neptune and only your dealer can touch it.

So i would get some burnable chips or get ostrich and switch it up to crome.

 

what you mean by cant adjust anything because of Neptune only the dealer can touch it

 

Last i remember Neptune has to be tuned by a Neptune dealer. Hondata and Crome are User tuneable.

 

it says the Neptune RTP can be user tuned plus there is only one CA Neptune dealer and its all the way up north that doesn't make sense???

 

if he has a speed sensor problem and has 2 step in his ecu it could be the problem there since the ecu thinks he's not moving

 

I am having this same issue with my boosted B18c1. ~4200 RPM the car just starts popping and backfiring and acting as though it's hitting the rev limiter and it just doesnt want to go anywhere. i've ruled out everything it could be and i'm convinced it just needs a re-tune (considering i just finished the turbo setup and haven't gotten it tuned yet, i've yet to crack Vtec so far)

and i also have a question on this^..... how safe is it to drive the car (untuned) when it is having this issue, if i don't rev past ~4000 RPM and keep it in vacuum or low boost? i'm assuming that not too much harm can be done without significantly beating on the motor... i've driven the car untuned like this for ~1000 miles and there isn't any smoke or odd sounds of any sort..... and i can tell that the car wants to get up and go but i'm not beating on it until i get it tuned.

 

YOU SHOULDN'T BE DRIVING A CAR UNTUNED PERIOD!!!!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 8YourV8 &raquo;</TD></TR><TR><TD CLASS="quote">I am having this same issue with my boosted B18c1. ~4200 RPM the car just starts popping and backfiring and acting as though it's hitting the rev limiter and it just doesnt want to go anywhere. i've ruled out everything it could be and i'm convinced it just needs a re-tune (considering i just finished the turbo setup and haven't gotten it tuned yet, i've yet to crack Vtec so far)

and i also have a question on this^..... how safe is it to drive the car (untuned) when it is having this issue, if i don't rev past ~4000 RPM and keep it in vacuum or low boost? i'm assuming that not too much harm can be done without significantly beating on the motor... i've driven the car untuned like this for ~1000 miles and there isn't any smoke or odd sounds of any sort..... and i can tell that the car wants to get up and go but i'm not beating on it until i get it tuned.</TD></TR></TABLE>


If you absolutely have to drive it, stay off the throttle!!! Check out H-T member, 93turbo16. He has a link from his H-T page to his homepage. He's tuned tons of cars with wideband's and dyno runs. When we were street tuning my car with his wideband it was doing the same thing, breaking up as soon as boost was applied. After about an hour of driving around, John was able to get it dialed in as much as possible considering we weren't on a dyno.

 

bump for the same problem in my gsr when i try vtec half throttle it works but i get the same as you guys at full throttle ?

 

okay so the problem was no the speed sensor but the male end of the plug so I just found a wire harness in the junk yard cut it and its good to go..NOW!!!!!!!

I got my ish tuned at Green Light performance ..thanks to Everrett out there...

My setup
B18c1
Ross Racing piston 8.5:1 piston
Eagle Cwrank
Eagle riods
AEBS sleeves
home made intake
S2000 exhaust manifold with Skunk 2 Evo catback exhaust
Homemade head work
Walbro fuel pump
some hapenese fuel rail
VAFC & chipped P28 fropm Engenuity

car made 170whp and about 140 lbs. of tq..

wasn't expectin gthat much out of the VAFCbut its just till I put the turbo on ...

 

GOOD FOR YOU!!