Nistune Forums

I have a 1982 datsun maxima that I swapped a s13 blacktop e5 engine in.

3071r t25 flange internal gate bottom mount
full 3 inch stainless exhaust no muffler or cat
inter-cooler
greddy intake
800 cc sard top feed injectors
inline walbro 255 -6an feed
fpr with gauge
z32 maf

anyways i got it running with a base file i had been working on. had a pain of a time setting latency for injectors finally set on 1350 or so. cruised around on freeway set the k value. had to mess with latency on freeway when giving throttle from.60 to .95 on tps.. to get it not to go lean.

first issue.. first gear will hold about 10 psi with a 12-14 garret wastegate. second gear 15 psi and 3rd witll go to 15 then boost creep to 20 psi. I took turbo off and ported the waste gate as much as possible behind the flapper. this did help because it use to boost creep way worse.

so when i try to accelerate in any gear it will pull and as i get close to redline it starts popping and goes lean..

list of what I have done.
changed cas
tried 2 different z32 maf 1 oem 1 aftermarket
3 sets of coils
2 ignitors
3 sets of bkr7e plugs gapped from .25 to .32
reset timing at 15
changed tps and reset to .48
checked for boost leaks
fuel pressure set at 43.5 no vac. drops about 10 psi with vac. hooked 15 psi to fpr and raises 1:1 accordingly

the reason this is bothering me is because it not a rev limiter im hitting.. makes car undrivable to drift .. cruising around it drives fine. part throttle it will cut out up top as well.

I have also tried 350z coil packs and bypassing the sr20det ignitor. I have tried multiple tunes. one this is I dont have a vss signal hooked up. I'm using a cable with a z31 speed sensor for my factory speedo to work. I have read that det ecu wont cut out from no speed input.. if i hammer it in 2nd gear until it pops and cuts and stay on throttle it somtimes feels like engine completely shuts down spark and fuel completely.. weird.

not that good with doing logs.
here is a log that recorded from me rolling in first and going wot and shifting to 2nd and wot then 3rd wot.. it cuts out each gear.

didnt checked your logs,but check if tp doesnt reach ttpmax or fuel cut value.

raddy wrote:didnt checked your logs,but check if tp doesnt reach ttpmax or fuel cut value.

tp reaches 60 t0 65
my tp max is 2 10 20 255 255 255 255 255 255 255 255 255 255 255 255 255
and the load cut tp is 255 across board.

I have been reading a lot about the soft and hard rev limiters.. it doesn't sound like a rev limit that car is hitting.. i read if you have soft set at say 7500 it cuts one injector at 7250 then two at 7350 then 3 at 7400 and 4 at 7500 or whatever 150, 100, 50n before cut setting. its weird in log because it shows me hitting 7500 rpm in first.. 72xx in second and 73xx in third. If this is a rev limiter I don't like it what so ever.. it literally make car hit a brick wall and unable to drift with it cutting out like that. sounds like spark is getting blown out. I have checked everything with spark.. hard is where is cuts all 4 injectors and has a time of .200 from what i understand.. this can also be hard on the sr20 valve train. i have soft set at 7500 and hard at 7800.. i use to have them both matching but car felt the same either way..

Well figured it out . My rev limiter was causing this issue. I have never heard a Sr with this sounding rev limiter... I raised the soft to 8200 and I don't ever hit it and car runs great.. is there a prob with hw I'm setting up rev limit ? Hard rev cam cause engine damage with valve train I have read.