Guys, I'm new to the turbo world, and I've got a 370ish HP beast, but it doesn't exactly run perfectly. The guy I bought the car from thinks the problem is a wastegate not fully opening, and I'm thinking it is an A/F ratio problem. Here is what happens.
Diving the car is just fine as long as you don't go over about 40% throttle in any gear. It will climb to 7K just fine, but under WOT at about 3500-4000 RPM this SEVERE hesitation will start happening. The car will jump and sputter all the way to about 5500 RPMs. My friend told me he can tell when the car is doing it from behind too because I huge cloud of smoke comes out. As soon as I get past 5500 RPMs the car will just take off like a rocket.
Additional info: I was watching the SAFC and watching the Kar reading. While driving, if it is not doing its sputtering the Kar will go to about 320 MAX, but when the car is sputtering it will skyrocket to about 1700. After 5500 rpms the Kar stays high but doesn't keep going up so far, it just slowly increaases from 1700 to about 1850 until I let off on the throttle.
Any ideas???
My dad is thinking possibly wastegate, and another friend of mine is thinking it could be an EGR problem, if I have one. Do I have an EGR, and could there be a problem with this?
#11435, "RE: Problem with the new GSX, help please." In response to Reply # 0
Moved from Advanced Tech (BECAUSE IT'S NOT ADVANCED!!!) to 1g/4g63 tech
______________________________ If a sentence found online has 35% misspellings or greater and includes at least two racially charged expletives, chances are it is a YouTube comment.
'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
#11436, "RE: Problem with the new GSX, help please." In response to Reply # 1
Give us info on every bit of the setup. Turbo, injectors, milage, evreything possible cause the hesitation could be any numbe rof things. Could be a dead TPS sensor, or fuel cut or any number of things depending on factors.
#11437, "RE: Problem with the new GSX, help please." In response to Reply # 2 Mar-14-04 11:56 AM by FlyinEsi
List of mods: Ported and cliped Big 16g Ported Exhaust Mani and O2 housing Apex i N1 catback 3" Injen intake with K&N filter Centerforce dual friction clutch, lightened RRE flywheel 10k miles on clutch and flywheel Nippon Denso 550 inj. Super AFC, 255lph fuel pump Greddy Big FMIC Greddy Type S blowoff valve Autometer EGT & Boost guages
1997 GSX 45,500 miles
Sorry guys, I should have included this in the first place.
#11439, "RE: Problem with the new GSX, help please." In response to Reply # 4
#1 check for a boost leak
#2 How old are the wires/plugs? I had the EXACT same symptoms (note, possibly not same problem, just symptoms) with a t-25 that just needed new (bigger) wires and plugs
Vandy
---------------------------------------
Black 98 GST missing her owner and looking for a new one...Inquiries welcome
#11440, "RE: Problem with the new GSX, help please." In response to Reply # 5 Mar-14-04 01:38 PM by BigBald
Yes start with an AFPR....you need one with a 255 Fuel Pump. Do you have a logger for this thing? Did the previous owner get this thing tuned? How did he come up with the AFC settings? How much boost are you running? Any CELs being thrown? Did you check your plugs wires and such? It sounds like it is Fuel Cut but it could be a number of other things.....
_____________________________________________ Jerrome B. 1995 GSX - Race 1997 GST - Drive 1995 GST - Who the hell knows
#11441, "RE: Problem with the new GSX, help please." In response to Reply # 6
Originally posted by BigBald Yes start with an AFPR....you need one with a 255 Fuel Pump. Do you have a logger for this thing? Did the previous owner get this thing tuned? How did he come up with the AFC settings? How much boost are you running? Any CELs being thrown? Did you check your plugs wires and such? It sounds like it is Fuel Cut but it could be a number of other things.....
AFPR? Are you guys asking for the settings on the SAFC?
This car has the walbro(?) 255 fuel pump. I don't have a logger for the car, just the SAFC. The previous owner had the engine built up from Road Race Engineering in Colorado Springs. I don't know if this car has always had this problem or not, but I'm going to call him and ask.
The car was running 22psi of boost on 93 octane gas, but I can't find 93 in Wyoming, so I filled up on 91 but I haven't ran full boost on that gas, I'm going to turn the boost down tomorrow just to protect myself from overboosting.
There was a CEL thrown one time when the car was doing its studdering thing, and it stayed on the rest of the day yesterday, and today, but I just noticed it went off on the way home from the office today. ???
The plugs on the car are a colder plug he said. He changed them every 3,000 miles with every oil change. He said the colder plug is better for the car since it is boosting so much. And the wires can't be any older than 15,000 miles, at the absolute max.
The car could definitely be having fuel cut, but that doesn't make sense because it runs just fine from 5,500-redline, why would it just cut out from 3500-5500??
I'll run outside in a bit and get the SAFC settings for everyone to gaze at.
#11443, "RE: Problem with the new GSX, help please." In response to Reply # 8 Mar-14-04 02:19 PM by Vandy420a
changed the plugs every 3k? Either he's nuts or he's lying to you...i've never heard of people bothering to do that, that seems a bit extreme...
also, APFR is a fuel pressure regulator...can't tell if you were confused or not
and seriously, check for a boost leak before you spend any real money...you should do that periodically anyways, and i've had problems with my Type S..in fact its really starting to piss me off
vandy
P.S. I didn't know there was a road race in CO.... are there others?
---------------------------------------
Black 98 GST missing her owner and looking for a new one...Inquiries welcome
#11444, "RE: Problem with the new GSX, help please." In response to Reply # 9 Mar-14-04 03:34 PM by chrysler kid
it could be the fact youve gone from a 120hp car to a 350hp monster and your feeling the turbo lag, but if its throing a cel and smoke out the back its probably not
sounds like your car is bogging. i doubt its a boost leak because it would happened all the time under wot. also check under the intake pipe and look at the ecu wires to make sure none of them are frayed. (thats what happened to mine)
checking what code the cel is throwing might help you a little bust most likely it will be emission system related.
wastegate problem would be cause by the flapper being partially open or shifted the wrong way. you wouldnt be throwing smoke out of the back for that tho or giving a code.
sorry i didnt anwser the question really but i can only guess what the problem is (shoulda had him fix the problem before you bought it imo)
