Subject	The point is that you're losing fuel pressure
Posted by	Joe(NoVA) on October 31, 2006 at 8:33 AM
	This message has been viewed 74 times.
In Reply To	I said that based on the mods list in your profile posted by 952+2TT on October 31, 2006 at 12:03 AM
Message	at higher loads and RPMs. Since you have less fuel pressure in the rails, you get less fuel through the injectors at a specific duty. You then use the AFC to have the injectors open longer (albeit with less fuel pressure) to get the proper amount of fuel into the cylinders. Its an incredibly dangerous situation, since the fuel pressure dropoff will not be consistent with things like temperature, battery voltage, etc., and you won't get consistent fuel into the cylinders, with the effect of widely varying AFRs. The proper situation is to have consistant fuel pressure for a given manifold pressure, and to then tune based on that solid number. Your case is to tune on an essentially failing (extremely important) fuel delivery element. You won't know how much of a failure mode you'll be in in any certain situation. ********************************************************* Joe GT675RS/Inconel AIM: hoyatiger81 "You probably never even got you hands dirty working on a car. Take care toolbox!" --djtz1 "It's not my fault you went nuts." - Kenny
Follow Ups	Ebay intercooler review and dyno numbers from a personal - ShakaShaun(Denver) 17:20:35 10/30/06 do you have both dyno for me to compare the overall... - Zluster(Abudan) 17:22:09 10/30/06 I sure do Sam. But how do I post/convert winpep - ShakaShaun(Denver) 17:29:42 10/30/06 send the files to me and I can take care of it. - Zluster(Abudan) 17:31:32 10/30/06 wow I didnt know stock injectors and turbos would - LJZTT 17:33:23 10/30/06 Yep they bolt up just like stock. - ShakaShaun(Denver) 17:38:52 10/30/06 wow, I only use 93, and have more or less same setup as you - LJZTT 17:48:46 10/30/06 5000 ft. (n/m) - Inzane 18:22:24 10/30/06 ah (n/m) - LJZTT 22:21:49 10/30/06 wow that's great numbers for stock turbos... - spyhunterTT(nj) 17:55:52 10/30/06 Compression is all withen spec IIRC. - ShakaShaun(Denver) 18:19:52 10/30/06 That's good to hear... - NatezTT 17:58:59 10/30/06 did yours come with the brackets for the back? (n/m) - jmw23712 18:10:37 10/30/06 They did not, which I thought was strange - ShakaShaun(Denver) 18:21:05 10/30/06 okay, just checking cuz mine didn't either. (n/m) - jmw23712 20:57:15 10/30/06 Re: okay, just checking cuz mine didn't either. - Slobo7x 09:36:01 10/31/06 Great numbers either way... - OrlandoTT 18:13:45 10/30/06 pretty neat. from the looks of the ic it looks like someone - MOZZ 18:36:36 10/30/06 Stock IC flows 161.2CFM @ 1psi PD. I will speculate to say - Ash's Z 18:43:07 10/30/06 Strong numbers! I would have expected more of an - Ash's Z 18:36:52 10/30/06 Do you only need one SMIC? - ZLover4Life 18:43:20 10/30/06 Yes, only one. That would excellent if you could do that! - Ash's Z 18:45:50 10/30/06 why would you have expected more if they're only a little - inf 19:22:09 10/30/06 I would have expected more from something called an - Ash's Z 20:43:54 10/30/06 How about a REAL independant test? - ShakaShaun(Denver) 20:09:02 10/30/06 I can see that you are upset about these exchanges and - Ash's Z 20:54:54 10/30/06 You could never upset me, don't flatter yourself - ShakaShaun(Denver) 21:02:15 10/30/06 Sigh.. this isn't a personal argument bro. - Ash's Z 21:12:59 10/30/06 What intercooler is this? Those are some damn good numbers.. - mr_buttawurf(down-n-out) 18:47:30 10/30/06 His peak power has little to do with the IC's he's using. - Ash's Z 18:54:30 10/30/06 I see.... was just thinking stock injectors and turbos..... - mr_buttawurf(down-n-out) 19:17:46 10/30/06 Running 100% duty on stock injectors isn't a great idea. - Ash's Z 19:20:26 10/30/06 137K miles, 80K of those have been mine running it just as - ShakaShaun(Denver) 19:54:14 10/30/06 My comment wasn't about your car. It was a generalized - Ash's Z 20:36:42 10/30/06 This sounds like a familiar arguement that is made whenever - ShakaShaun(Denver) 20:41:57 10/30/06 OK, but are you fine with your mixture being at 13:1? - Ash's Z 20:50:19 10/30/06 It's been fine that way for the last 4 years - ShakaShaun(Denver) 20:55:23 10/30/06 lol (n/m) - Zluster(Abudan) 20:59:53 10/30/06 13:1 at the actual power numbers (314RWHP, 328RWTQ) - Ash's Z 21:00:24 10/30/06 huh? (n/m) - PennStateZ 21:27:36 10/30/06 Something is knocking from under the hood? - Spongerider :) 23:33:27 10/30/06 what?! (ash talks about altitude correction factors again) - Zluster(Abudan) 20:45:05 10/30/06 Apparently so do the JWT programs. His car is running - Ash's Z 20:51:14 10/30/06 Even with the C-class your program is lean. - Zluster(Abudan) 20:53:51 10/30/06 Must not have been a c-class program in that case. - Ash's Z 21:03:20 10/30/06 You really want an honest independant test? - ShakaShaun(Denver) 21:10:12 10/30/06 I am always open to an honest, independent test. - Ash's Z 21:24:43 10/30/06 I wouldn't trust that dyno reading - Woody75 (Denver) 22:46:56 10/30/06 Here's the Post - Insomniac(VA) 18:54:51 10/30/06 Thanks...they have already removed it from ebay though. (n/m) - mr_buttawurf(down-n-out) 19:20:27 10/30/06 Here's your fish > - Barry'z (NJ) 19:37:45 10/30/06 9 hp and 3 tq for $$$? - SpecNATT (Houston) 19:30:27 10/30/06 I really doubt that "better" intercoolers - ShakaShaun(Denver) 19:56:29 10/30/06 cool (n/m) - SpecNATT (Houston) 20:12:27 10/30/06 Re: Ebay intercooler review and dyno numbers from a personal - Zluster(Abudan) 20:14:46 10/30/06 22% correction!? WOW. - Ash's Z 20:40:47 10/30/06 You would love to see how lean your program runs up here - ShakaShaun(Denver) 20:44:13 10/30/06 A few people have when they first move here... - Zluster(Abudan) 20:47:30 10/30/06 My c-class programs run richer than JWT's do. (n/m) - Ash's Z 20:48:55 10/30/06 I could name somebody who had a c class program from you and - ShakaShaun(Denver) 20:52:24 10/30/06 Re: I could name somebody who had a c class program from you and - Ash's Z 21:27:56 10/30/06 This is typical of every ASH chip dyno I have witnessed - colocomp (Denver) 07:35:14 10/31/06 Looks to be 0.5 points leaner than the JWT program and - Ash's Z 11:42:03 10/31/06 Blah Blah Blah (n/m) - colocomp (Denver) 13:21:35 10/31/06 hey wayne, hows it goin? (n/m) - Zluster(Abudan) 14:19:09 10/31/06 I can't complain - colocomp (Denver) 14:30:27 10/31/06 oh its alright.... - Zluster(Abudan) 15:09:00 10/31/06 Why even start if that's how you're going to finish? - Ash's Z 15:00:44 10/31/06 lol - colocomp (Denver) 15:11:57 10/31/06 I guess it's a dead horse. - Ash's Z 15:32:43 10/31/06 A dead horse that thinks the difference between - colocomp (Denver) 17:02:35 10/31/06 14.8:1 on an NA fuel pump - 952+2TT 21:03:07 10/30/06 Yes, it does make a difference - Joe(NoVA) 21:18:42 10/30/06 I did not "bitch" about an improperly setup ECU program - 952+2TT 22:54:43 10/30/06 Lol, i don't have any ecu anymore - Joe(NoVA) 23:13:13 10/30/06 I said that based on the mods list in your profile - 952+2TT 00:03:21 10/31/06 Buy yourself a fuel pressure gauge and watch... (n/m) - Fuzznutz 05:24:15 10/31/06 The point is that you're losing fuel pressure - Joe(NoVA) 08:33:04 10/31/06 Thanks, that makes sense. - 952+2TT 12:56:11 10/31/06 Lol, why do you remind me an angry little nerd everytime I - Tennyson (ATL) 20:53:37 10/30/06 LOL, I dunno. Maybe I'm just biased and dont see why - Ash's Z 20:58:20 10/30/06 Yup, those are the real numbers. - Marshall 21:41:30 10/30/06 have you fooled with the timing at all? (n/m) - Spee 20:25:21 10/30/06 I guess if your stock ones were cracked or something. - zboost(tx) 20:49:36 10/30/06 er .... well said. (n/m) - Guapo 20:53:21 10/30/06 and stuff (n/m) - aliaZ 21:28:45 10/30/06 my thougts as well, I think I would rather just get greddy (n/m) - Zluster(Abudan) 20:54:54 10/30/06 He has more then one account on ebay. (n/m) - Slobo7x 09:33:12 10/31/06 uh ya....thank for telling me that... - Zluster(Abudan) 13:21:03 10/31/06 i think i saw more than one seller selling these.. - MOZZ 21:20:03 10/30/06 I hate to rain on your parade, but (altitude and dynos) - Marshall 21:38:48 10/30/06 Hey Marshall. - WAGGZ 21:45:48 10/30/06 Yeah, for the time being. - Marshall 21:48:14 10/30/06 Thankyou for the explanation, Marshall. - Ash's Z 22:43:13 10/30/06 Hell, here's the effects just based on intercooler - Ash's Z 23:21:28 10/30/06 And taking it one step further >>>>> - Ash's Z 00:26:21 10/31/06 I see people with the same mods - Woody75 (Denver) 22:55:26 10/30/06 I go to school in TN and live in CO - ben7021 23:29:51 10/30/06 Got to remember, that dyno always reads leaner. - Woody75 (Denver) 22:40:17 10/30/06 Just curious, what is the A/F you guys see up there on - Ash's Z 23:30:08 10/30/06 Here you go at sea level... - OrlandoTT 08:04:53 10/31/06 Interesting. That looks like a stock fuel map curve. - Ash's Z 11:50:25 10/31/06 Good post. Glad to hear it from another member, I told - Slobo7x 09:29:04 10/31/06 Extra HP is nice, but don't forget heat soaking. - 300zx90 (CO) 16:14:03 10/31/06
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