SCC and CA18 Fuel Injection

Post by **boost_boy** » Sat Sep 06, 2003 11:13 pm

Quote »Run rich, lazy timing, poor fuel economy ? no thanks[/quote] Not to bash JWT here because they are reputable and some swear by their tuning that their cars run better, but I have to agree with you on this one. I must have had the laziest, sorriest turbocharged car in the world using a JWT ecu, z32 maf and 370cc injectors with a t25. I changed to the 3 bar fuel map and 50 lb/hr injector computer that I had and the stinking car was a bit more responsive, but still lazy as hell. I mean 20psi of boost and the car drove like it was boosting 5psi. I ditched JWT and bought the SDS stuff and the car's performance was blistering even though I half-way didn't understand the tuning format. Just for some key information, CA18DET computers feed heavily off the VSS and if the data is corrupt, the computer will hamper timing in the higher RPM range.

Website · Post by **s13sr20chris** » Sat Sep 06, 2003 11:13 pm

boost_boy wrote: Just for some key information, CA18DET computers feed heavily off the VSS and if the data is corrupt, the computer will hamper timing in the higher RPM range.

i have heard rumors of early '90s usdm models doing the same thing. i must say though that i have never seen evidence myself.

on the subject of megasquirt...

HANDS DOWN WINNERof the bang for your buck award

plus the guy that made it makes you do all the work and even lets you modify it how ever you want. by letting you i mean that he says he provides system operation data. hows that for tech support?

Post by **McAdam** » Sat Sep 06, 2003 11:13 pm

I LOVE tech stuff like this! I think I am gonna take a computer course when I get my arse back in school! if you want further proof of how much JWT sucks, look HERE . I am sure some of you have seen this, I think it is quite funny.

On the megasquirt thing, if you were really into electronics, you could convert it to a sequentail system yourself. or, if you wanted to be stupid about it, run two of them on one four cylinder and set them to alternating bank firing. that would technically be sequential, wouldn't it? lol. I think I am going greddy emanage when I finally get my stuff together with my CA19DET, crankshaft issues resolved and what not. perhaps I will try a hacked MAF route with some nice 440 or 550 injectors. Iam gonna keep my eye on this thread...

McAdam

Post by **quest** » Sat Sep 06, 2003 11:13 pm

ca18det ecu is tried and proven, with excellent results - just checkout uk and aussie results. I've seen no evidence of the VSS being an issue.... perhaps its something that chip burners eliminate with ease ?There is a live thread on the uk bbs of a "chipped" oe ecu ca18det that makes 396+hp with sh1tty tuning, on a soso setup... STOCK bottom end at that! Runs a cheap truck holset turbo.

Post by **Trigger** » Sat Sep 06, 2003 11:13 pm

wow some of these post are a little to long to reaf

Post by **float_6969** » Sat Sep 06, 2003 11:13 pm

Sorry, thats usually me. I'm a little long winded when it comes to this stuff. But you can't learn if ya don't read!

Post by **boost_boy** » Sat Sep 06, 2003 11:13 pm

Quote »ca18det ecu is tried and proven, with excellent results - just checkout uk and aussie results. I've seen no evidence of the VSS being an issue.... perhaps its something that chip burners eliminate with ease ?[/quote] Maybe on the vehicles that came equipped with this engine, but for us people that reside here in the U.S. that do swaps, it may be a bit different. Since I used the pulsar's complete car harness as well as engine harness, my sentra did whatever a pulsar did. And it will kick into stupid mode when the ecu sees dramas with the VSS. My girl's car performed horribly with the JWT ecu whereas my car (after numerous trips back to JWT for my ECU) kicked some major dust. And because I used a 60-1 turbo, the engine still ran rich from idle to mid-power, then leaned out horribly. To you guys that run W.O.T. without getting better acquainted with your car's performance, you are just asking to blow an engine if things aren't functionally correct. I am not the W.O.T. type of driver! I feather my cars through their power band until performance feels right to me. W.O.T. under highboost and a fuel system hiccup is a recipe for a melted #4 piston and JWT has a tendancy to promote such behavior.

Post by **iliketocrash** » Sat Sep 06, 2003 11:13 pm

ummm... what is VSS?

Post by **boost_boy** » Sat Sep 06, 2003 11:13 pm

Quote »ummm... what is VSS?[/quote] Vehicle Speed Sensor! Variable speed sensor!

Post by **float_6969** » Sat Sep 06, 2003 11:13 pm

I don't know why the computer needs to know how fast the car is going. hehehe

Post by **boost_boy** » Sat Sep 06, 2003 11:13 pm

Quote »I don't know why the computer needs to know how fast the car is going. hehehe[/quote] There's the problem; when JWT removes the speed cut (pulsar's don't have any) and removed the rev limiter or raise it, all hell breaks loose. Nothing seems to work right anymore they've waved their magic stick over some people's ecu including mine and that's why I opted out and went standalone. Now, I'm in control of the way the car runs, idles and cranks and BTW, my cars have A/C and P/S with fast idle and idle up. So whether it's batch fired or sequential fired, it works for me and am definitely biased towards it because it not only exceeds performance of a modified ecu, it ends up being the cheaper route in the long run.

Website · Post by **s13sr20chris** » Sat Sep 06, 2003 11:13 pm

ok, just got back from nissan tech school(obdII class) and i asked the teacher to find out about the vss thing. he said that nissan has used vss input on manual trans equipped vehicles for years. he said the point was to make sure the car was moving before any egr, evap purge, etc kicked in. we checked it out and it is infact true. there may be some system using this input that will go into failsafe if not recieving vss signal. the last part is my own idea though. of course he has no idea about jdm stuff though.

Post by **float_6969** » Sat Sep 06, 2003 11:13 pm

Nice info, Thanks!

Website · Post by **s13sr20chris** » Sat Sep 06, 2003 11:13 pm

no prob, always looking for a chance to act "cool".

Post by **float_6969** » Sat Sep 06, 2003 11:13 pm

I don't think I said anything about you being cool... JK!

Website · Post by **s13sr20chris** » Sat Sep 06, 2003 11:13 pm

oh man, you got me there:)

Post by **iliketocrash** » Sat Sep 06, 2003 11:13 pm

hey, if you two wanna flirt then just PM eachother instead of being post whores. now be good you too;)

lol

Post by **float_6969** » Sat Sep 06, 2003 11:13 pm

I'm a post slut thank you very much. Hores accept money, I do it for free. (plus there is no PM'ing on these boards, it doesn't work)

Post by **iliketocrash** » Sat Sep 06, 2003 11:13 pm

whoops. excuse my ingorance.

Post by **float_6969** » Sat Sep 06, 2003 11:13 pm

No prob

SCC and CA18 Fuel Injection

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