kwalker705 Posted March 6, 2011 Share Posted March 6, 2011 hey folks. Need some advice. I've recently converted my toyota Aristo to a single turbo. The car was off the road for about 4 months. I finally got the car back together but there seem's to be an issue with the car. When I'm on boost and come off the throttle and decelerate quickly the rev's drop quickly right to the point when the car stalls just as i stop. If I drive normally and slow down gradually in good time for junctions the car acts as normal and doesn't stall. Anyone experienced anything the same or can anyone help identify the problem ?? Quote Link to comment Share on other sites More sharing options...
Nic Posted March 6, 2011 Share Posted March 6, 2011 What's the spec of the car: Turbo, ECU, Fueling, etc. Quote Link to comment Share on other sites More sharing options...
Ian C Posted March 6, 2011 Share Posted March 6, 2011 You are overfuelling Quote Link to comment Share on other sites More sharing options...
kwalker705 Posted March 6, 2011 Author Share Posted March 6, 2011 You are overfuelling Is there any thing I can do or check to confirm this myself ?? Or do i just need to get the car mapped and set up properly ?? Quote Link to comment Share on other sites More sharing options...
fastcar Posted March 6, 2011 Share Posted March 6, 2011 Definitely get it mapped mate. If it is over fueling it will cause all sorts of problems Quote Link to comment Share on other sites More sharing options...
Nic Posted March 6, 2011 Share Posted March 6, 2011 Or do i just need to get the car mapped and set up properly ?? So it hasn't been mapped? What's the full spec? Quote Link to comment Share on other sites More sharing options...
kwalker705 Posted March 6, 2011 Author Share Posted March 6, 2011 not been mapped yet. currently running at 0.7bar. spec is K&N cone filter holset H1C turbo 3" downpipe 3" exhaust 50mm wastegate walbro 255lph pump gizzmo boost controller NGK colder plugs HKS FCD HKS SLD II Quote Link to comment Share on other sites More sharing options...
bignum Posted March 6, 2011 Share Posted March 6, 2011 http://www.myholsetturbo.com/modelinfo.html Quote Link to comment Share on other sites More sharing options...
Nic Posted March 6, 2011 Share Posted March 6, 2011 (edited) NA or TT? So you're just running it with the stock ECU? If so it will never run properly and you risk trashing the engine by driving the car. Edited March 6, 2011 by Nic (see edit history) Quote Link to comment Share on other sites More sharing options...
kwalker705 Posted March 6, 2011 Author Share Posted March 6, 2011 was a TT. Stock ecu Quote Link to comment Share on other sites More sharing options...
Nic Posted March 6, 2011 Share Posted March 6, 2011 was a TT. Stock ecu You need a new ECU and the car mapping. As I said you could do a lot of damage driving it as it is. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted March 6, 2011 Share Posted March 6, 2011 NA or TT? So you're just running it with the stock ECU? If so it will never run properly and you risk trashing the engine by driving the car. Sorry but thats rubbish. I drove my Aristo with a T67 and stock fuelling for a couple thousand miles and its absolutely fine. Quote Link to comment Share on other sites More sharing options...
Ian C Posted March 6, 2011 Share Posted March 6, 2011 (edited) Sorry but thats rubbish. I drove my Aristo with a T67 and stock fuelling for a couple thousand miles and its absolutely fine. Is the aristo sequential or parallel twins as stock? What AFRs did you have on part throttle, and on high boost low RPM? "I don't know" isn't an aswer that'll back up your reassurances that it's absolutely fine Edit - Actually, scrub those questions, I'm sure it's all OK. You say you "drove", that implies you don't drive it with stock fuelling and ECU any more? Why did you stop? Edited March 6, 2011 by Ian C (see edit history) Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted March 6, 2011 Share Posted March 6, 2011 Because winter came along is the answer. Im pulling the engine to fit a manual box etc. then fit the Fcon Pro V. It was an auto so didnt experience high boost/low rpms, but part throttle cruising was high 14s and full throttle was 11 or below. Quote Link to comment Share on other sites More sharing options...
Nic Posted March 7, 2011 Share Posted March 7, 2011 Sorry but thats rubbish. I drove my Aristo with a T67 and stock fuelling for a couple thousand miles and its absolutely fine. Fine? Has the engine been checked internally for signs of detonation/wear from bore wash? You would advocate to another member that if they drive their single turbo Supra with stock fueling and stock ECU all will be fine? Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted March 7, 2011 Share Posted March 7, 2011 Fine? Has the engine been checked internally for signs of detonation/wear from bore wash? You would advocate to another member that if they drive their single turbo Supra with stock fueling and stock ECU all will be fine? Why would there be bore wash? Stock 2JZs dont suffer from it do they? Im neither advocating nor dismissing anything, just stating that, like the OP, I ran a single turbo on stock fuelling and personally I have had no problems. Quote Link to comment Share on other sites More sharing options...
Nic Posted March 7, 2011 Share Posted March 7, 2011 Why would there be bore wash? Stock 2JZs dont suffer from it do they? The OP is obviously over fueling, this could lead to bore wash/engine wear. The stock 2JZ-GTE does run slightly on the rich side, but not excessively so. Quote Link to comment Share on other sites More sharing options...
bignum Posted March 7, 2011 Share Posted March 7, 2011 It won`t be running rich on a 61mm truck turbo trust me;) Quote Link to comment Share on other sites More sharing options...
bigbloodyturbo Posted March 10, 2011 Share Posted March 10, 2011 Swampy what boost did you run the t67 at that resulted in those afr's? did you have 550's in or 440's? Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted March 10, 2011 Share Posted March 10, 2011 Ran about .7 or .8bar, and stock J spec 440 injectors. I wasnt constantly giving it beans obviously Quote Link to comment Share on other sites More sharing options...
Ian C Posted March 11, 2011 Share Posted March 11, 2011 Im pulling the engine to fit a manual box etc. then fit the Fcon Pro V. Well I was going to ask why are you wasting money on an aftermarket ECU when the stock one apparently runs it fine? But then: It was an auto so didnt experience high boost/low rpms and: Ran about .7 or .8bar, and stock J spec 440 injectors. I wasnt constantly giving it beans obviously is a good couple of caveats and get-out clauses compared to: Sorry but thats rubbish. I drove my Aristo with a T67 and stock fuelling for a couple thousand miles and its absolutely fine. So you can see why Nic and I picked up on it. Did you mean to say was "I carefully drove my Aristo with a T67 on low boost for a short period of time and avoided the fuel map areas that would go horribly wrong, and it seems OK still although I haven't checked. However I am sensibly upgrading things now." and not in fact "That's rubbish, it's perfectly OK" Saying something is "Rubbish" is dismissive, and saying something is "perfectly fine" is advocating, sorry guv Some people actually read this stuff after a quick search and latch onto it as gospel because it sounds like the cheapest route. -Ian Quote Link to comment Share on other sites More sharing options...
kwalker705 Posted March 27, 2011 Author Share Posted March 27, 2011 Bit of an update on the car and what's been happening lately.. Put the car in for it's MOT even with it still stalling at times. The car failed it's MOT on 1 thing. emmision's at fast idle the emmisions were fine. At low idle the emmisions were through the roof !! I'm going to assume the high emmisions and stalling are linked. I decide to change the MAF sensor, water temp sensor and lambda sensor to rule them out but the car is still having issues with stalling after being revved past 4000 revs. Looking for more advice folks . the car idles fine. drives fine but if you come off the throttle quickly after being at 4k and the rev's drop quick it just dies !! I've tried upping the idle but it still happens even at a 1000rpm idle. Is there any possibility this could be an ecu issue ??? The battery was flat after sitting for the winter and wondered if reconnecting the battery after it being flat would cause any issues !. Or even if there is a diagnostic software available for me to use If the cost's wern't too high I'd be willing to look into getting that to help diagnose the problems Quote Link to comment Share on other sites More sharing options...
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