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Yes, stock return line. With Aeromotive AFPR I can set 25psi at idle without problems, so I guess return line is not restriction. May be even lower but I don't need it. When I tried stock FPR with big feed line I saw almost 50psi at idle.

Ian, I'm not going 500+rw on 440cc. I have 720cc's for that goal. Update: Installed 440cc injectors and... Problem is still there =( To be honest, I'm totally messed up. I have only one perfectly working setup: 550cc, stock feed, walbro, stock FPR. I can't try stock feed with 440cc...

how much power are you planning on making? I'm going 550+ RWHP with water injection. As for 440cc.. I hope they will handle 11psi (my lowest boost). Well double up on the Bosch 044 or go an 040 (external). See if that fixes the issue. Great idea, figgie! But bosch 044 costs 350$ here and...

update: Installed aeromotive fuel filter. Now car leans in 4700...5000 range AND 5700-6000. It proves that it's fuel-pressure/flow related (not tuning). BTW, I'm bying AEM from member here and going full sequential injection soon. And stock 440ccs for now :(

1.5msec is the lowest point for most EMS without going to an autronic (know to be good to .75ms) and MoTeC (.6ms). 1.5ms is usually the smallest you can go without affecting the spray pattern. I'm with you. Can you post your fuel map.. an image capture of it is fine. I can't right now...

I appreciate your help, but we are speaking different languages... by "it" I meant injection time. Lowering inj time always leads to leaner mixture, but raising FP leads to leaner AFRs in my case too! (at very low injection time). As for inj time value... 1.5 is not little. Haltech fires...

BFP - more pressure does not help in closing injector faster. That is a function of your EMS. More pressure WILL inject more fuel per given pulse width. My idle inj. time is 1.5ms and AFR is 12.8. If i reduce it, I get 16.xx AFR. Increasing FP at idle from 25psi to 32psi and AFR becomes 13.5 @...

Thank you for input! I've tried different BFP - from 37 to 43psi. 43psi seems best to me because it runs leaner at idle (more pressure helps closing injectors sooner, I think). Injectors are low-imp Denso's wired like stock (two in parallel via resistor pack). Car doesn't backfire (no...

Hello. Haltech E8 here installed on 7M-GTE (injectors are paired). Last summer I was running 550cc injectors in multipoint mode and everything were ok. Now I've installed 720cc and got some problems. I can't tune AFR in ANY injection mode. In batch/multipoint I can't tune any load above...

Email sent from MrY@inbox.ru. Thank you!

X-man Awesome! PS: any chances to see ignition timing map?

topgear Please post datalog file in *.csv format. RPM, MAP, Ignition advance, AFR, injection time vs time. Better to post 2 datalogs: small boost w/o "fuel cut" and problematic log. PS: warning, grab logs at your own risk ;-)

topgear stop doing that! You'll ruin engine. IJ. I almost sure, It's CPS problems. Engine is reving (speed goes up), but AEM doesn't see it (see tacho readings). So we have engine @5K rpms running at wrong tables cell (fuel and ignition). Very lean mixture + wrong ign advance make car...

quake Why are you trying to run soo low? There are two reasons: -I'm in process of fixing some bugs now and road tuning. It's better to make mistake at 10psi than @ 18 psi. -We have only 95oct here (european rating, like 91 american, I think) B.T.W, couldn't you PM ignition timing map...

Ok, I've found the problem. XO2 wastegate is shitty construction. Upper shim that holds spring and can be moved by screw (regulating pre-load) is very thick. It limits valve movement so valve not fully opens. I removed all useless stuff from WG and gained about 10mm more of valve travel (but now...

I'm trying to run _less_ boost. I want 10psi across all RPM range and not 18psi after 5300rpms.

Hello guys! My setup: - Driftmotion 7M tubular manifold (SS AC style but with v-band WG flange), actually XO2 racing - Driftmotion wastegate with 10 psi spring and minimal pre-load (actually XO2 wastegate, 44mm tial flanged) routed to 80mm cat-back - Precision T67DBB 0.68A/R Problem...

3p141592654 I know... But batch is better than multipoint... And 550s were working fine in multipoint mode. PS: I haven't enough channels to run injectors in sequential mode.

lzalusky, what do you mean by problem? Just knocking sound left after dampener installation or you couldn't tune AFR? PS: thank you for input

Hi. I've installed a lot of new stuff recently (Aeromotiv AFPR, Denso 720cc, FPD bypass hose from DM) and started car yesterday. I could here loud knocking sound that feels when hand is on fuel supply SS hose). Well, I started car and began to tune fuel map. At 3500RPM engine was shaking...