I recently fitted a Hardpipe set to my TT . The problem I now face is this: While accelerating & on boost, I get up to around 4500 rpm & the motor just bogs down & quits. Once the revs drop down a bit, the car then accelerates as you would expect, no problems. I'm begining to wonder if I now have a fuel pressure problem & the resulting hicup is caused by fuel starvation, but that might not be the case, as once the rev's have dropped the car accelerates up to 6000 rpm no problem. At first I thought, ah!! plugs are fouling up, so I have new plugs in the car but still have the problem, this annoying hicup. Other than that all is fine. Any ideas or suggestions would be appreciated, as I'm at a loss to explain or find what is causing this to happen. Cheers & Beers Kerry :zlove:
Are you sure all the hardpipes silicon joins are far enough over the metal on both sides and all the clamps are done up tight. This sounds like what would happen if they were a bit loose, you'd loose boost there and the engine would go stupid cause it would be seriously starved for air.
Many occasions have seen fitting of new boost pipes with loose clamps, even though they are quite firm. Boost leak test will confirm. This is especially more susceptible with silicon joiners, rubber seems to clamp better. What type is it Kerry, Caz Racing, Brand Name, ebay, second hand?
Lots of silicon over the pipes & yes the clamps are as tight as, so thanks but thats not the problem. Cheers Kerry
if the pipes arnt sealing 100% they will leak air.. mixture being rich then.. motor bogging down sounds like it could be too much fuel, just as its expecting lots of compressed air, throws in lots of fuel.... but the air has escaped
Leak test done and no leaks on the entire system showed up. I used a liquid leak test kit when doing the pressure test of the system. Thanks Rob Cheers Kerry
Hi Karl The pipes are UAS & as I've stated in a previous post, there were no leaks. I'll have a chat to you next week when I'm in Townsville, who knows we might just come up with the problem solved. Cheers Kerry
Hmmm!! never thought of that one. I do have the motor set to run a little richer than normal, but it's been set like that for years without any problems before this. Cheers Kerry
Well, sounds like not a leak You said that it happened after the new hardpipes went on. So it wasn't happening before? Check the connectors near there, one may be loose. Including the injectors connectors. One of them may be shaking loose and causing a misfire. Also, you mention it goes to 4500 then dies, you back off then it will happily go up to 6000 rpm. So does the 4500 problem only happen when it's cold or occasionally etc.?
Yeah, that's what I meant. But you said they were all heaps tight. Try reving it with the hood up using the throttle cable and see what happens as you go to high revs. You might spot the hose expanding near a clamp somewhere.
Happens Hot or Cold. What I was wondering is, now that the motor is getting more air flow into the throttle bodies because of bigger pipes etc, is that the mixture was now leaning off. But then if that were the problem it would continue to lean off up to 6000 rpm & it isn't. No, it was not noticable before hand. All connectors etc as also quite firm, but well worth looking at, although why one would suddenly become loose is beyond me, considering that when the pipes were put on, no work took place anywhere near any connections. Thanks for your input, I will check the connectors etc though, just to prove to myself that they can be elliminated as the source. Cheers Kerry
Not missing any rags are you? Common practice is to cover up the intercooler / turbo exposed pipes prior to fitting the new hardpipes. Have seen a few MIA rags which have caused similar probs. Failing this, try refitting the stock rubber pipes and see if the problem dissappears
my car was doing that, just before it cacked itself, turned out to be the AFM, once i replaced it all of those strange little problems disappeared, i think a failing or faulty mass air flow meter cause many and varied gremlin like problems with the motor
Are the pipes bigger? Though this would not be the problem, as the AFM measures the air going in and fuel is adjusted accordingly. On that note, maybe the AFM is having issues? Try cleaning the wire (there's a tech article somewhere). One other way to (possibly) easily check. Do you have a boost controller? Try turning boost down to stock and see if that fixes it. Maybe high boost levels are blowing it loose somewhere.
hmm i dont know much about tt engins but ill give it a stab. hmm sounds like to me your engin is starving of fuel, you might want to get a bigger fuel pump and regulater to provide more fuel with the demand of which it requires, if not that check ur fuel lines you could have some blockage some where, hmm could be ur afm but i doubt it, if ur able to push it upto 4500 and get powerloss and back off and get it up to 6000 and have no probs, you might want to get ur car tuned like zed4life and others has a laptop and cable pugs into ur ecu and checks ur car out and changes ilde and tighten ur elcelerator cable and gives you better peddle response, and stuff like that, you'd be supprised how much better your car can run with a hr or less of tuneing, also as others were saying a rag may cause this problem if you forgot to take a rag out when ur working on it and closed it inside the engin, were human no1 is perfect, easy to do aswell. if your injectors were stuffed you would have same problem as you would runnin stock boost and all, you would be best to test it on stock boost if dosnet have problem boost it up untill your car can handle it and stop it just b4 the point where it cuts out, have you got a boost controler on it? if you dont the turbo's will try and get full boost whilst reving and their fore cutting out ur engin, if not that man just take it all back to stock and just boost it up as much as possible. if you wana spend big money take it to turbo/car specilist and get them to source what prob is and fix it might be a little pricy$$$$. good luck with that mate, Reguards Shaun
What's a liquid test ? didn't you pump air into the system and listen for the leak? I've seen this happen many times after fitting hard pipes, reason being is the engine tilts slightly lower at the front, so when you push the silicone sleeve onto the throttle body, it fits up square and even on the top, but if you look very closely down the sides of the TB and underneath, you'll see the silicone has not gone on as far as the top section has. This also means sometimes the hose band will tighten at an angle too and in turn causes a very minor boost leak under load only and hence the result is like a "fuel cut" effect at a certain RPM. Really inspect closely the 2 TB hoses and see they are completly evenly fitted top and underneath. smithy
