Hi,

I've just installed the RX7Store ultimate fuel system, mainly comprising of 1000cc prim, 1600cc sec, denso fuel pump and FPR. I also fitted an HKS downpipe, 2x NGK 10, 2x NGK 11 sparkplugs. In addition I had a FULL NON-SEQ conversion to the stock twins.

Since I have had this done, there have been a 2 issues. My idle is hunting, but I blame this on the injector sizes. I have programmed this out for the most part. But as stated in the title, when accelerating through 2k-2.5krpm, I get major hesitation which makes the car hop insanely! If I keep my foot down it will eventually push through it and then pull well to redline. I'm running the base map for ignition and fueling.

Other mods include, PFC/Commander/Datalogit, AVC-R (set to 0.8bar), straight through exhaust.

I haven't been able to hook up a wideband to see if it's running too rich around this area of the map., but I suspect with the new injectors and FPR it's running quite rich?

Anyone have a similar setup which I could get a copy of the map from?? Or any other advise/help is appreciated. The car is booked in with the tuner in 2 weeks, but I would like this smoothed out before then.

TIA

Martin

 

forgot to mention that the FPR is set to 40psi

 

I'm no expert here but I'm guessing that your PFC needs to relearn you car's idle. Do the "all data init." and let the car relearn the idle. You most likely are running rich with all the additional fuel. You need to get tuned. Time for a wideband.

 

First of all you need to set the inj offsets correctly on a data logic. Also get a wide band on the car and see whats goin on. All these mods with no tuning? This is a recipe for disaster on a rotary engine. You need a tuner who has this info. Try giving Gotham Racing a call and asking for Steve Kan. Hes hould be able to give you the correct settings.
www.gothamracing.com

 

Thanks for the concern guys. My tuner has already assisted with the setup and assures me that it is safe to drive in it's current state until the 13th Sept when he will be tuning it for me. I'm quite aware of the problems cause by bad tuning on rotaries, but nothing I have done would cause a lean condition on the base map, only make it richer than it already is. Please let me know if you think otherwise with reasoning.

What I am ideally after is a car will similar specs that I can compare my map to, and try to find significant differences that would cause my hesitation.

Thanks
Martin

 

Check here:
rx7club.com/showthread.php?t=65373
And here:
rx7club.com/showthread.php?t=342723

And take a look at the datalogit user group on yahoo.
http://sports.groups.yahoo.com/group/Datalogit-FD3S/

What are your injector overlap settings? Still 1 2 3 ?

And by the way, why do you need all that fuel with stock turbos?
Are you going big single soon?
Just wondering.












/

 

That sounds like the transition from prim to secs. It's not tuned correctly. Also check your injector settings in the PFC again just to be sure. And did you wire the resistors in correctly on the secs.

Edit: Isn't the base map set up for seq? That could be the problem. And make sure the seq is turned off in the PFC settings too.

 

Thanks for that info Capt. Bill. Will try some of it tomorrow, hopefully will get a wideband hooked up too.

Yes, the injector overlaps are still 1 2 3. I'm not convinced about the sec transition being the issue as it only happens ever happens at 2,000rpm whether I gun it, or accelerate slowly. No harm in trying though.

I realise that the fuel setup is underworked for my setup, and yes, the plan is to go single once I have drained every last bit of life out these twins, which shouldn't be long

Thanks again

 

I have unchecked the sequntial control check box for the PFC, and I did not wire the injector resistors.

Hopefully all will be clear tomorrow once I hook the wideband up, and check to see when the secndaries are trying to kick in.

Thanks

 

"I've just installed the RX7Store ultimate fuel system, mainly comprising of 1000cc prim, 1600cc sec, denso fuel pump and FPR. I had a FULL NON-SEQ conversion to the stock twins."

Why are you running so much injectors for this setup?

The 40 psi fuel, is this at idle or 0psi?

 

40psi @ 0psi.

I'm running so much injectors mainly because I want too, and I plan on going single in the future. I hate doing things twice, and even worse, paying for basically the same thing twice. So I put the biggest system I could easily install on.

 

ok, hooked up the FC Edit to monitor the problem (still no wideband though). I checked the output, and where I get the problem my O2S is reading between 2.99 and 9.99. Where I get smooth acceleration it reads around 0.88. I'm guess this is the cause of the problem. Will try to attach a zipped log file. If someone could take a look and see if anything else is out?? So, is 9.99 rich or lean?

My secondaries don't seem to kick in until around 4000rpm so the transition definately isn't the problem.

Thanks

 

Don't know abot the log, but 9.99 on the O2 is on the rich side

 

ok ,thanks. Not sure the 9.99 is a direct AF reading though if that what your thinking?

 

That log's a little wierd, I don't think that O2S column is your AFRs. They should stay between 10 to 20(on decel). How did you do this test? Where you driving around? Personally, I wouldn't worry anymore till you get it tuned.

 

lol... thought thats how you read it.

Yes, I was driving the car around, doing passes through the trouble area. I guess I don't have a choice but to wait for the tuning. Just didn't want my tuner wasting time sorting this out, rather than getting a decent map.

Thanks for your comments.

 

If you e-mail the RX7 store[Jason] He'll send you a base map for what you have.He can send a MSexcel file to upload to the datalogit. That's agood place to start tuning.

 

I already sent an email to Jason to that effect on Sunday. Not heard anything back as yet

Should have a new wideband sensor arrive at the end of the week, so hopefully can get some tuning done over the weekend.

thanks

 

Sorting things out is one of the many things to pay a tuner to do. I see so many cars that run but don't run well because they never get the sorting out finished. It's easy to tune for wot at one boost level, it just takes a wideband and some patience. The trick is getting it to run right under all the other conditions.