Guest jjohart Posted November 17, 2003 Share Posted November 17, 2003 The advice I got from the list here for my 83 280ZXT I/C project was to get a fuel pump, preferably a Bosch. The advice I was saddled with from my dealer was to get a progressive fuel unit. I bought both these pieces, but am now wondering if its an A to B correspondence, that once I put these things in line with my Greddy B and turn up the boost, unless I add an AFC, I'm going to be running way rich, or just giving an unnecessary river of fuel to the stock injectors? More importantly, I'd like to avoid drivability issues, so do you think I should plan on buying the SVO injectors and AFC-that was formerly my dividing line, that I didn't think i'd need it for sub 300BHP tuning. So, what other tweaks are available to tune/adjust the rich/lean once the fuel pump and prog.rate fuel unit (Bell/Cartec)? Should I just sell the fuel unit and pump, since some folks say I won't need em either? Stumped by non-stock add ons as vital vs. frivolous! John Quote Link to comment Share on other sites More sharing options...
yo2001 Posted November 17, 2003 Share Posted November 17, 2003 wideband and dyno, only way to find out for sure Quote Link to comment Share on other sites More sharing options...
Guest bastaad525 Posted November 17, 2003 Share Posted November 17, 2003 If you want to sell that Cartech unit let me know I may be interested. Quote Link to comment Share on other sites More sharing options...
Guest jjohart Posted November 17, 2003 Share Posted November 17, 2003 Sell it?!! I bought it to use it, not to crap out on it, unless I've been getting a pile of hoopla from my over-zealous racing installer! I must say, I got more than I bargained for when I called Bell Racing about this. Apparently, Mr. Corky Bell answers some technical inquiry calls himself (neverminding his $35 membership fee to "talk to the master"), and I really couldn't get the just of his technical talk, as informed as he is. Simple questions about what to use this with, stock or upgraded pump, whether a I/C'd 280ZXT is a "factory" or "aftermarket" turbo, even with a JCW chip (in all cases, he says it is). One big no-no that he doesn't say, but I guess is general knowledge, is NOT to use his Progressive Fuel Unit in tandem with a JCW chip..since this somehow impinges on the digital-analogue maps that the chip upgrades, or the fuel unit downgrades...or something beyond me like that! John Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted November 18, 2003 Share Posted November 18, 2003 I would maintain there certainly is no point to using a RRFPR with a properly functioning Z31 EFI system. What is needed is a constant fuel pressure, as the internal fuel maps in a Z31, including JWT, are all based on it. And I don't mean constant without a manifold reference, in fact it is the manifold reference that ensures a constant fuel pressure to the injectors under all operating conditions of cruising and boost. Quote Link to comment Share on other sites More sharing options...
Guest jjohart Posted November 18, 2003 Share Posted November 18, 2003 So, I dun been hoodoo'd? I mean, take a look at the text for the third item off Motorsport...25-30bhp gains. Who coulda told em'. Before I sell this item, are you saying it's a redundancy, that it adds nothing? Gulp, are you gonna say the same of the Bosch fuel pump over stock?!! It's a hard day staring out the window and dreaming of aftermarket parts, when sometimes stock IS best!! John-83 280ZXT Quote Link to comment Share on other sites More sharing options...
Guest jjohart Posted November 18, 2003 Share Posted November 18, 2003 http://www.zcarparts.com/store/merchant.mvc?Screen=CTGY&Category_Code=PFFC14 Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted November 18, 2003 Share Posted November 18, 2003 Don't know if you've read any of my other recent posts, but I highly recommend the Bosch pump as the foundation of any highly boosted Z. From what others say, the RRFPR is useful on an otherwise stock 280ZXT, where you've maxxed out the AFM with stock injectors. You still need a high pressure pump. And I support Yo2001's comment on "wideband and dyno" because you never know what you're going to get blindly tuning a RRFPR. Quote Link to comment Share on other sites More sharing options...
Guest jjohart Posted November 18, 2003 Share Posted November 18, 2003 What is wideband? I wish I had a glossary, I dunno, what RRFPL stands for, and I bought one! So, the APC/Bell unit would be redundant without injector changeover, right? I'd still like to know on what basis Z Motorsport can claim a 15-25bhp improvement to their "owner's reported" horsepower...they make no mention of the injector system, etc. Hmm, I guess that's why they call it the AFTERmarket...cuz it's always "after you get this, then you can get this!!!!!!" Will B.S in product sales ever end? Why would I even ask!!! John-83 280ZXT Quote Link to comment Share on other sites More sharing options...
Sean73 Posted November 18, 2003 Share Posted November 18, 2003 Here's the deal, raising fuel pressure increases fuel flow. Adding boost coupled with fuel flow to support it will increase HP. Therefore, it is indeed possible that a RRFPR could add 15-25 HP, but it depends on boost level, intercooler efficiency and a variety of other factors. You don't just bolt the thing on, turn up the boost, and expect positive results. It's not that simple. Like others have said, you must tune on a dyno. What is wideband? I wish I had a glossary, I dunno, what RRFPL stands for, and I bought one! Don't be offended by this comment, but you are definitely in over your head. I tell everyone to read Maximum Boost cover to cover before doing anything above stock on a turbo motor. You just can't rely on heresy, anecdotes, and company advertisements to give you any indication of results. Once you become educated on turbocharging, the path leading you to your power goals will become crystal clear. Quote Link to comment Share on other sites More sharing options...
Z-Gad Posted November 18, 2003 Share Posted November 18, 2003 You just can't rely on heresy, anecdotes, and company advertisements to give you any indication of results. Once you become educated on turbocharging, the path leading you to your power goals will become crystal clear. My sentiments exactly!! No flame here, but put the wallet down (after you buy the book), read and do your research and go from there. I was in a similar boat before I was turned on to Maximum Boost as well. It is well worth the $. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.