thndrwhls Posted June 10, 2007 Share Posted June 10, 2007 So, I have been thinking(Look out, could be dangerous), I was wondering if a loarger bore throttle body could be adapted to an 89 vg30? I did a bunch of searching and I am thinking the answer is no without spending a small fortune but wanted to see what would come back anyway. Any thoughts? Link to comment Share on other sites More sharing options...
88pathoffroad Posted June 11, 2007 Share Posted June 11, 2007 I dunno. If someone could build an adapter plate, I bet you could use a Chevy TBI on there, as long as the injector types, mass airflow sensor and throttle position sensor match. The stock TBI setup has a single fire/double fire setup where they fire singly when under light throttle and both wide open at WOT, no idea how Chevy TBI's are set up, if they would be compatible. Other than that, what would you use? Link to comment Share on other sites More sharing options...
GrimGreg Posted June 11, 2007 Share Posted June 11, 2007 The TBI on an old Cheby 4.3 is similar to ours with the dual injectors. Not sure on the bore size though. Link to comment Share on other sites More sharing options...
thndrwhls Posted June 11, 2007 Author Share Posted June 11, 2007 Gotta friend with a machine shop and a CNC that could make an adapter plate. I noticed today that there is a supercharger out of a Xterra on ebay, perhaps that and the TBI from the Xterra would work. I dont know but am willing to try and see what will work. Link to comment Share on other sites More sharing options...
95NPATHYSTYLE Posted June 12, 2007 Share Posted June 12, 2007 is the 300Z's interchangeable & if so will it work? Link to comment Share on other sites More sharing options...
88pathoffroad Posted June 12, 2007 Share Posted June 12, 2007 1. The only US Nissans that got a TBI(VG30i, specifically) were 87-89's. The 4-cylinder KA24 uses the exact same TBI unit. 2. Early US 300Z's never had a VG30i, they were all VG30E's with MPFI. Link to comment Share on other sites More sharing options...
mws Posted June 12, 2007 Share Posted June 12, 2007 I've thought about it, and then concluded switching to the MPFI was a far better (and potentially easier) option. Link to comment Share on other sites More sharing options...
88pathoffroad Posted June 13, 2007 Share Posted June 13, 2007 Probably, yeah. Link to comment Share on other sites More sharing options...
GrimGreg Posted June 13, 2007 Share Posted June 13, 2007 I've thought about it, and then concluded switching to the MPFI was a far better (and potentially easier) option. I would have to agree. Link to comment Share on other sites More sharing options...
thndrwhls Posted June 13, 2007 Author Share Posted June 13, 2007 And switching the MPFI would deffinatley involve switching the computer and any other neccesary realted items? I am sure there are other threads on the subject that I have read in the past... Riddle me this: Does anyone know where to get the software required to remap our computers? Link to comment Share on other sites More sharing options...
88pathoffroad Posted June 14, 2007 Share Posted June 14, 2007 You'd have to buy a ROM burner and the software for that, then go from there. To re-chip an ECU requires desoldering of the existing chip, they don't plug in. It's not easy to do. Link to comment Share on other sites More sharing options...
mws Posted June 14, 2007 Share Posted June 14, 2007 And switching the MPFI would deffinatley involve switching the computer and any other neccesary realted items? I am sure there are other threads on the subject that I have read in the past... Yes. Easy way is to pick up a body damaged 90-95 with a blown automatic for $300 and start swapping parts! Link to comment Share on other sites More sharing options...
thndrwhls Posted June 14, 2007 Author Share Posted June 14, 2007 (edited) I really was just wanting to know so I could modify the existing ECU. I used to work for a company outside of Detroit that specialized in Automotive networks and proticall, but this is old technology and most likely would have to know what software, type of code etc... I am almost positive it was in early Basic, but if there are programs out there for calabrating our ECU's that would be very helpfull. For that matter, with software and minumal hardware investment I am sure ai could get those guys to show how to and perhaps we could have our own little remaping gig for NPORA members. this way we can customize to our requirements and not somebodys idea of a what we need. Whatcha think??? Edited June 14, 2007 by thndrwhls Link to comment Share on other sites More sharing options...
88pathoffroad Posted June 14, 2007 Share Posted June 14, 2007 Well...like I said, to make any changes you'd need to remove the ECU, open it up, desolder the ROM chip and then build a new map, burn it onto a new chip, then either solder that to the ECU or get a chip seat that lets you remove the chip... Link to comment Share on other sites More sharing options...
jj big shoe Posted June 15, 2007 Share Posted June 15, 2007 Or if you're feeling ambitious, you could build a completely stand-alone EMS like a MegaSquirt. Check out DIYAutoTune.com for info. Looks like you'll have to do a lot of homework, but it's doable. Link to comment Share on other sites More sharing options...
SC88Pathy Posted June 24, 2007 Share Posted June 24, 2007 1. The only US Nissans that got a TBI(VG30i, specifically) were 87-89's. The 4-cylinder KA24 uses the exact same TBI unit. Was this the truck KA24 or was it used in the 240sx as well? Because if it was used in the 240sx KA24 I bet a tuner shop somewhere makes larger throttle bodies... Link to comment Share on other sites More sharing options...
GhostPath Posted June 28, 2007 Share Posted June 28, 2007 Was this the truck KA24 or was it used in the 240sx as well? Because if it was used in the 240sx KA24 I bet a tuner shop somewhere makes larger throttle bodies... All the US S12 and S13 240SXs were MPFI, not TBI. So it's probably truck only. TBI sucks rocks anyway, so no point in trying to enhance it when a simple conversion to MPFI is available, IMHO. Link to comment Share on other sites More sharing options...
88pathoffroad Posted June 29, 2007 Share Posted June 29, 2007 Sorry, I should have clarified: only the KA24 TRUCK engines got TBI's. Link to comment Share on other sites More sharing options...
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