Ok, here’s the deal. My brother has a 92 GSR and I have a 93 GS with a B18C1 swapped in. My brother’s car has had this problem where the car seems to hold back around the 3000 rpms, but pulls much harder after he passes about 4k rpms. He has had this problem ever since he bought the car.
On my 93 GS with the B18C1, I have a skunk 2 intake manifold, which gets rid of the secondary butterflies. I originally ran with the chipped P72 it came with and had no hesitations whatsoever. The bad part was I got really crappy gas mileage and I failed emissions. So, I swapped the ECU out for an unchipped P61. I passed emissions and my gas mileage is better, but now I have the same hesitation that my brother has.
My question is, is this a common problem with the 92-93 P61 ECU’s? Is there anything I can do to fix this besides chipping the ECU? I would rather get to the underlying problem, if there is one, instead of just putting a bandaid on it.:werd:
dude I’m in the same boat.
Just put a b18c in my 93 and that hesitation is killing me.
It’s so sluggish around 3-4.5K then it starts to kick and then VTEC!!! which is fun but I wan’t some smooth midrange.
are you saying getting a p72 will make me fail smog? cause I was thinking of doing that. hmmm
anyone else have any input?
no, the P72 I have is chipped with uberdata. but, i think the guy that did this tune didn’t know what he was doing. I am now running an unchipped P61. I’m thinking since the GSR motor is set up to run with the dual stage intake manifold, my aftermarket manifold won’t let it run correctly with a stock ECU, in this case, loss of torque in the low end. thus, the chipped ECU is allowing my car to run stronger because it is programmed to run with the aftermarket manifold. am i correct?
side question: could a competent tuner tune a car to where you are extracting maximum power without the car failing emissions? i.e. should a tune on an otherwise stock motor cause it to fail emissions?
be smart about it… put back the stock intake manifold and pass inspection then change back
i can pass inspection with the aftermarket manifold as long as i use my unchipped ECU. besides, that would be a pain in the ass to do. am i not making sense?
what i’m trying to figure out is the hesitation i’m having in low rpm with the unchipped P61. also, if i could get a tune or if its even possible to where i’d still pass inspection, but my low rpm power wouldn’t feel so sluggish.
the intake manifold doesnt have the dual butterflies and the ecu is programed to open them try and sell your gsr and get a b16 or type r
if its tuned with uberdata, wouldn’t a compitant tuner be able make the change(s) needed to fix that. i would think there is a way to alter the map in the range of 3-4K or disable the butterfly switch :think:
i’m not understanding what you’re saying. are you telling me to sell my gsr MOTOR or ECU? and, the stock P61 ECU is off a 92-93 b17a gsr, which DOES NOT HAVE the dual stage intake manifold. if the stock motor didn’t have it, then why would the ecu be trying to open the secondarys?
well, the problem is not with the chipped P72. the hesitation is coming for the unchipped P61. so, basically, this is how it looks like:
chipped P72 = runs strong with no hesitation, but crappy gas mileage
unchipped P61 = hesitation in low rpm, but good gas mileage
if i could get my P72 retuned to where i could get decent gas mileage and pass inspection, that would be ideal. i know gas mileage won’t be like stock, but i think my current tune on the P72 is dumping too much fuel, thus causing it to fail emissions. this is why I am currently running my unchipped P61 right now.
then if the ECU is running rich, maybe its time to hit the dyno for a better tune, maybe drop a pound on the fuel presure:shrug:
im talkin about the ecu and i do think the 92-93 gsr’s have the secondary butterflies
ok. integradude is running a chipped p72. car runs great, no hesitation but fails emissions.
now how about a ‘stock’ p72? how different would the car run as opposed to being chipped? any better?
Am I better off keeping my p61 on for my now-needed smog check?
damn I’m lost
here is the thread that says only the newer gsr motors have the dual stage intake manifold.
http://g2ic.com/forums/showthread.php?t=120988&highlight=butterflies
JonJonJonJon: do you still have the stock manifold for the B18c1? if so, i think the best thing for you to do is to either get a stock P72 ecu OR disabling the secondary butterflies and getting it tuned. only when it gets tuned, make sure your tuner can guarantee he can create a tune that will still allow you to pass smog/emissions.
BLKACK1: as i said, too much fuel is only an assumption i have. i guess i’ll have to start saving some pennies for dyno time and a tuner’s services to see what exactly is going on in that tune.
thanks for all the help guys.
I guess I just have to find a p72 ecu. damn
But will it pass emissions?
And no integradude, I don’t have the b18c IM, the motor I picked up didn’t come with it. My b17 would’nt fit so I had to go aftermarket.