KA24DE with sr20 injectors, 300zx maf, ecu chip what you think??

[Bigvinnie]

I have a JimWolf stage 4 turbo ecu for my turbo set-up. Tuned for 740cc Tomei injectors and a 93 ford cobra MAF. Jwt said I could only use the stock oem ford maf - $325. I know jwt tunes conservative so I wanted an safc too - $180???= $505 or so. Then I found this fully tunable 100% digital MAf. I had two choices 85mm or 97mm ( can flow over 1000+ whp) The V8 shop guys said get the bigger one cuz its digital and only $10 more. = $395 maf and tunability.

SInce Jwt doesn't use endorse anything but stock mafs (probably 4 legal reasons) I decided to run my set up N/A so if something was wrong I wouldn't blow my engine. So I loaded the 93 ford program and fired her up. OMG ran like a champ. Took it on the street INSANE I never felt a KA like that. It could burnout in first then let off , catch , stomp it again and start burning out again all the way to redline , turbo style it was crazy (15in w/ ss595s). Pls the high end opened up big time. I was revving to 7200rpm and it felt like it was pulling hard all the way. I thought the turbo ecu would be pulling timing and acting up but no it was great. Must dyno NOW! It felt like 175- 180+whp. I raced a KA-T w/a T25 @ 7psi. I smoked him 1-2-3 over six car lenghts. He said his car bogged (famous one) and he let off So I said lets go again he said "nah" and looked all dejected.

Disclaimer!! The above statements were done w/ an LC-1 wideband , that for some reason loves to uncalibate itself. I highly recommend getting a WB and using the analog output emulator to feed o2 signal to your ECU. Awesome feeling. My dyno runs were without WB. it kept acting up so I unplugged it and used the stock one (bad move). Tried to adjust maf to compensate but I didn't know what the hell I was doing and made it worst. stupid LC-1.

Anyway my first pull was off the shops WB gauge - below 8.0:1afrs but I still managed a 151whp and 154ft-lbs. I tried maf tuning again but it got worse (wasted run). My final run was at 9.5:1 afrs and hit 154whp and 158 ft-lbs. I was impressed but I knew it had way more but I ran outta time. Btw when It was crazy fast on the street it was about 11.2:1 afrs. *deep breath**whew* lol.

Stock engine , no header , egr working , swirl valves working , stock cams (91 thou) , 3in intake / exhuast , JWT lightweight flywheel , clutch fan delete.

O.K so I am a bit confused on the MAF part? Would you be using a ABACO tunable MAF for corvettes, and Roush Mustangs setups?

From what I understand KA engines also loves a tad bit of richness at high RPM. I believe that happy place for alot of power is in the 12.6:1 to 12.4.1 AFR at 6500~7000RPM range. When the engine made 162 WHP my AFR was a 12.5:1, I could of possibly pulled 2 more donkeys running just a tad leaner at 12.6:1. Could of also left the A/Fr at 12.5:1 and tried to tune base timing for an advance of 3, to pull the ecu MAP timing from significant retard. Could of possibly gotten the engine to 165WHP with some minor tweaks and adjustments. When my engine was richer in the 12.2:1 range it was still making power at 157WHP at 6500RPM. So it does seem some what relative to what you are saying about the A/Fr's Dunit.

I'm pretty surprised for the amount of richness that you did have it didn't effect best mean torque. When ever your shooting for that happy peak torque number its better to have the engine a tad leaner. Then when your shooting for peak HP at a really high rpm its better to go a tad richer.

[D-UNIT]

Yes I do have a 97mm Digital MAF from http://www.abacoperformance.com BigVinnie. I hear what your saying about a/f ratios and when I first ran the car I didn't want mess with anything A) Because it ran so great even at 11.7 a/fr @ WOT. It would start with a half click of the key. B) No one could help me. I had the first Digital ( <--my name - or Down like my 240 always is...) MAF on the island.

But when my Wide band kept taking a dump I started to jump into tuning but its not like a safc - where you adjust points over the rpm range nooo. You're adjusting the actual maf flow map. Where you adjust voltage over grams of air per second. Way over my head at the time. They have a neat slider feature thou where you can adjust specific points in the map with slider bars like a DJ. Problem was that I was adjusting too little too late.

I cannot stress this enough INVEST IN A WIDE BAND your ecu will love it. Just feed it the analog signal generator and your KA should do things you wouldn't imagine it could do.

I raced a Honda w/a LS/vtec head swap and mugen computer ( revs over 8500rpm est very low to mid 14s 1/4mile). before my ecu swap I could beat him off the line but by second he would scream by me. From a 2nd gear roll he would let me go then by third he would pass me like I was standing still. It was shameful. But when I when I but my injectors and maf w/wb whoa different story. Off the line 1-2-3 he couldn't catch up. From a 2nd gear roll who ever got on the throttle first would win by a fender. I was amazed. And he now had RESPECT for the mighty KA24DE! and never raced me again. haha.

moral of the story as Bigvinnie and I can attest bigger MAF and injectors among other things will give you more HP. I mean seriously when your MAF hole is smaller than your intake manifold runners diameter . Common cents haha. We have dyno charts and real world tests to prove it. To the OP do it and enjoy your newfound power , and if it doesn't work I didn't say anything......j/k

BTW chris28 T28s are awesome and I don't know why everyone disses them.
Modified by D-UNIT at 11:32 AM 11/1/2009

[Bigvinnie]

I was just checking out the specs on the abaco DBx97 and the DBx97b, both of those MAFS put the RB25 Ljetro dual MAF (q45 MAF) set up to shame.

I am pretty impressed with its digital metering. I think I might buy one. i would say that its almost more affordable than going route via MAP and speed sensor.

[D-UNIT]

Yeah its pretty awesome. You should download the free tuning program and check out the tunibility. Also you can have it emulate whatever MAF you have thats not in the database ( $50 fee of course). My favorite feature is the ten settings you change on the fly. Also it is so accurate you could theoreticly run any size injector , as long as you have the right injector drivers. Can't beat the 1000x a sec sampling either.

found my old thread zer...95676 <-- haha chris28 ur in my thread oh u didn't know!

well I decided to put the turbo on and tell you what you can't beat the feeling of 8psi at 1500rpms.


Modified by D-UNIT at 10:07 PM 11/1/2009

[kaluv]

D-Unit how's it?

How's the wiring for the electric MAF? Anyway you can do a write-up? If its as good as you say it is, that would be a sweet DD. I'm just looking for a little more HP than the basic bolt-on. Thanks

[-RJ-]

lol i cant wait to hit the junkyards. there are always 1 or 2 q45 over there. I think im gonna pull the MAF and get a few of the injectors

Also got a question, I was looking at Emance website and they said they tune ECUs, you just have to tell them what mods have been done to the motor. So would you guys go towards this, a tuned ECU, than a SAFC?

http://cgi.ebay.com/ebaymotors...ories
Modified by -RJ- at 8:38 PM 11/22/2009

[Bigvinnie]

lol i cant wait to hit the junkyards. there are always 1 or 2 q45 over there. I think im gonna pull the MAF and get a few of the injectors

Also got a question, I was looking at Emance website and they said they tune ECUs, you just have to tell them what mods have been done to the motor. So would you guys go towards this, a tuned ECU, than a SAFC?

http://cgi.ebay.com/ebaymotors...ories

Make sure that the injectors are from 95-97 q45's, the O rings on the older q45s will not fit right. i know this from being an idiot and picking up some injectors from a 94 model by mistake.

get a maf from a 90-94 nissan maxima the N60 MAF.

As far as Emance the service is hit or miss, I've seen happy customers and extremely pissed off customers on Zilvia.

[-RJ-]

ha cool alright, i was about to pull injectors off a 91 q45

[D-UNIT]

Finally found my dyno run pics

first run 7-8 afrs and below



fourth run 9.0 or so afr



sixth run finally tuned out dip but still only 10.5 afrs. ran outta dyno time



overlay

[-RJ-]

thats not bad considering the stock ka comes with 130whp right

[Bigvinnie]

thats not bad considering the stock ka comes with 130whp right

Not to mention 10.0:1 AFR is beyond pig rich for an Naturally Aspirated engine.Peak power could of pulled higher into the 7000RPM range with a leaner A/Fr, also timing is retarded a bit more on Dunits tune for turbo. Good possibilty this set up is missing out on 10 more whp it doesn't see because the A/Fr is so rich and timing is retarded a tad more than a NA tune.

This is proof that this setup has alot of potential if tuned right.

[-RJ-]

ha i cant wait lol. if i can pull 155 whp id be happy with just the q45 injectors, n60 maf and ecu tune

[Bigvinnie]

ha i cant wait lol. if i can pull 155 whp id be happy with just the q45 injectors, n60 maf and ecu tune

Please post dyno results when finished....

[D-UNIT]

Not to mention the guys running the dyno said that It was running so rich that I had fuel washed my rings. Which means that my cranking compression was way down and I was losing alot of HP especially in the higher rpms . They said that I'd have to drive the car for over fifty+ miles in non rich conditions to get my normal compression back. pls take that into account when analyzing the numbers.

We were also thinking that the dip in the graph is from the ecu loading up the fuel anticipating the boost hit at 4500rpms.

Also we just found out friday night that my msd ignition box was faulty. My car felt like it had very aggressive traction control. But I think it was acting up off and on for a long while causing me to miff my tune and post up weak NA dyno numbers. I swear the car felt like 175+ whp when I first put everything in.

[-RJ-]

Get everything fixed and run the dyno, I wanna see the numbers

[D-UNIT]

HAHA Impossible , I'm turbo now.

zerothread?id=465805

no one really cared when I made that re-dyno thread so I slapped my turbo on. But when I see threads like this I jump in cuz I loved my NA KA and I can help and will.

[-RJ-]

if anyone lives near a junkyard that has a 95-97 q45 with its injectors, let me know lol. throw them into your pocket and ship them to me

[angrypenguin182]

Lol upon reading this thread I'm thinking im going to the junkyard and seeing if my friend wants to do this to his ka,i'd love to do it on mine but my engine is gonna blow soon

If i do go to the junkyard this weekend if you pay shipping ill pocket them lol

[-RJ-]

that would be awesome!

[angrypenguin182]

No luck this weekend i went and there was only 1 q45 and it was a 93, maybe next time lol. i couldn't find any n60's either

[Bigvinnie]

EDIT *Please post this in the classifieds section*

[-RJ-]

damn it, there was a 96 in my junkyard but someone pulled to motor lol. I might just end up buying sr injectors if i cant find any in the next 5 months

[Bigvinnie]

damn it, there was a 96 in my junkyard but someone pulled to motor lol. I might just end up buying sr injectors if i cant find any in the next 5 months

http://www.ninfiniti.com

is a wrecking yard in cali that can ship you off these injectors.

[D-UNIT]

I just found out why my car was runnig so rich NA. Don't know why I didn't think of it before. This is why my car never idled properly either. I just blamed it on the 740cc injectors. Anyway checked my fuel pressure last week and Voila 42psi w/ vacuum 53psi no vacuum. So I changed FPRs to one I had lying around and even worse 51 psi idle and 62 no vacuum.

[Cdstreet]

Good info. Makes sense. Maximize power wirh the stock parts.

[-RJ-]

anyone wanna give me donations to get my ecu tuned =p

gonna get some injectors and hopefully a maf tomorrow. Cant wait to get all this stuffed installed and tuned

[-RJ-]

ok i got the injectors but i have a question. That little plastic piece of the injector, tan in color, broke off on two of the injectors when they were pulled out. Is that piece important? If so can they be ordered

[Bigvinnie]

ok i got the injectors but i have a question. That little plastic piece of the injector, tan in color, broke off on two of the injectors when they were pulled out. Is that piece important? If so can they be ordered

Its called the pintle cap. It effects spray, protects the injector tip from getting hot. Its like an insulator it would be wise to get a replacement. You can order them thrpugh nissan infiniti dealer ships.

[mastertech]

I am just wondering how jf240 and RJ are doing on their upgrades. I am very interested in seeing the outcome because i want some more power, but am not motorswapping till next winter. thanks

[-RJ-]

i got the injectors and a maf already, i still need to order the pintle caps, wideband and tune