HalfSpec

iTrader: (14)

Thank you for the pics Howi! I've got those bad boys saved to my project folder for future reference. It looks a lot easier than I thought it would.

Keep up the good work
Lane

LJD

Excellent swap. It's a shame so few manufacturers are using I6's, opting instead for V6's mostly because of their shorter packaging. There's nothing like the smooth powerband of an I6 or a V12 (basically two I6's joined at the crank).

ahad

@howi: Hey man Ive been a bit busy these past couple o months but i finally got around to getting my car dynoed again. I had an exhaust leak and bad coils so i got all that fixed and raised the boost to one bar. I dont have the dyno sheet on me right now ill post that in a day or two but i made 238whp and the car was running a bit lean. Now from what ive seen on the forums Ive seen ppl making 240whp easy at 10psi. My turbos are perfect no smoking and stable boost. I dont get it! Im stumped what could possibly be the reason? My curve was pretty weird too it started dropping at the top end. All ive got is a 2.5 inch freeflow and a walbro. Does anyone have any idea what could possibly cause such low figs? Dyno figs in my country Pakistan generally tend to be a lot lower than what ppl abroad to tend to get. We have fully built H22's making 20-30whp less than what they should be making. B16's,H22's, turboed setups u name it but theyre generally a bit lower than what we read on the forums. I dunno it might be a case of our part of the world getting fucked up engines or something. One of the reasons I could think of was that it was around 116-117 degrees farenheit that day and my citys around 1500feet (510m) above sea level so im guessing that could account for abt 8-10whp shortage but at 1bar im guessing i should be at around 270-300whp. Could anyone correct me if im wrong at my assumption and possibly suggest possible things i should look at to try n find out why my cars underperforming? Thanks!

Howi

iTrader: (2)

I agree. If it wasn't for the cheap prices on 1JZ's, I would have seriously considered aluminum block I6s such as the ones offered by BMW.

It's hard to resist a twin turbo, twin-cam, shim-over buckets, over-square I6 engine for only $800 CAD....

Hmmm... This doesn't sound like a JZ FD RX-7 specific problem; I mean, you are making decent power, just not quite up there. I would start with the most basic troubleshooting techniques:

- check for compression on all 6 cylinders
- make sure you're running good plugs and wires (BTW, I fixed my ignition break up issue, it was crappy plug wires causing it)
- make sure you have no boost leak
- make sure your wastegate seals when it's closed

It'd help to see your dyno results too. Do you have another other problems? Such as ignition break up at high rpm, tach dies/jumps everywhere at high rpm.. etc.?

Howi

Seth1884

hmmm well if you were all interested in making one i might be interested in it come the day i actually get this project going lol. then again shipping to the states would be killer i bet... track use is kind of my whole want for the fd with a 1j. i just know it'll do a good deal of sitting around and that's what makes me iffy about doing a rotor motor, let alone where i am there's not really any reputable rotor shops.

also i'd like to use a feed hood if i really had my options lol! i'm not big on the tech2 hood at all, the thing bulges a good deal too much for my tastes. plus for body i wanted to go to a 99 spec front end and well that'd look god aweful with their hood matched with it. the scoot isnt bad. i'm kind of like you i'm not big on the center but it could be a ton worse.

85RotaryRocket

iTrader: (1)

You should definitely be making more power at 1 bar on a 1jz than that. I have a 7m with stock ct26 @11.5 pounds and i make 274 hp / 282 ft/lbs to the wheels ( stock intercooler, stock fuel pump, stock 440’s). Are you using stock y pip?

ahad

arite guys as promised heres the dyno sheet...ok do notice the messed up curve and tell me what u guys think...ive already ordered ik20 plugs which should arrive soon...the idiot didnt save the old dyno readings so i got another couple o runs just for you guys :P arite the first sheet is at 10psi:
http://img142.imageshack.us/i/supra7.jpg

heres the 1bar run which i got done today...only got one run and it was 232 instead of the previous 238 but u guys get the picture...

http://img159.imageshack.us/i/supra72.jpg


Now the SERIOUSLY disturbing thing for me is that the AFR at 1bar was 13.5!!!! i flipped when i saw that reading on the wideband...Iev got a walbro in and the stock 380cc injectors shud handle 1bar...then why so lean? Ive got 2jz 440cc injectors lying around whicih shud do the trick but i wanna knw the reason for this issue rather than just brushing it under the carpet (btw i got a nitrous kit in and was planning on running it today but the afr obviously changed my plan :P) Can someone suggest a possible reason? Im gonna check the fuel pump relay in the morning which could be a possible reason why the FP isnt getting enough voltage to perform. My question is could the ECU wiring have anything to do with this? That my ECU due to faulty wiring is not increasing the fuel pressure as is required. Let me know what you guys think man I really need your input you guys are my only hope.

85RotaryRocket

iTrader: (1)

Do you have a fuel pressure regulator? Also, do you have an safc or piggy back ( though essentially that’s what an safc is) or anything to control the A/F ratios? Also on 380’s I wouldn’t push for anything past the 300-305 hp mark, as that would be running the injectors past the 80% point (if im wrong on this one, someone correct me).

ahad

The Correct Links:
http://img142.imageshack.us/gal.php?g=supra7.jpg

http://img142.imageshack.us/img142/8615/supra7.jpg

http://img159.imageshack.us/img159/1734/supra72.jpg

@howi: Could it be a case of the ECU wiring? I didnt do my car's wiring so I really dont know. Gonna check the voltage on my fp and let u guys know.

ahad

Dont have an FPR. I was gonna use an afc for nitrous but thats not a priority anymore. I reckon the 380's should handle 1bar so i didnt bother getting bigger injectors. like i said I do have 2jz 440's but that wouldnt solve the issue. I think its a case of the fp not delivering rather than me pushing the car beyond its limits.

85RotaryRocket

iTrader: (1)

Well if you atre pushing your injectors past the 80 percent efficiency cycle (considering they are now almost 20 years old), you could be leaning out and that can be the reason for you having 13+ a/f at wot. I wouldn’t push the stock 380’s to one bar. That’s just my opinion, less you have had them flow tested, and even then you’re still running them to their max range.

Howi

iTrader: (2)

Hello Ahad,

That's a pretty bad dyno curve. Either your tuner doesn't know what he's doing, or your car is having problems, no doubt about it. It should be nice smooth curve like mine. The fact that it goes up and down like crazy is a sign that something is not keeping up with the power and rpm. For example, I have the same erratic curve near redline, and it was due to ignition break ups.

I have a few questions for you because I don't know anything about your car. Do you have the AFR chart with your dyno like the one I posted on page 1 of this thread? That can help you determine whether it's a fuel related issue.

1. What ECU are you running? Is it a standalone or factory ECU with piggy back?
2. What ignition system are you running? As in, the coils and ignitor?
3. I asked you before, are you having weird problems like jumpy tach, power break-ups/bogging at wide open throttle or high rpm?

Either way, I recommend that we talk offline via pm or emails about this. I'll shoot you a pm and let you know my email address. I'll do my best to help you out.

Howi

Howi

iTrader: (2)

On Saturday, July 25th, we attended yet another Onyx Syndicate event at Dunnville and managed to optimized the pressure and camber set up for each wheel for this particular track. Although it was a very rainy day and we weren't able to prove it, but I believe that this is a 1 minute 13 second car on that track. Because at the end of the day, the rain stopped, the sun came out, and the track dried up all just in time for everyone to have one chance at their time attack; and with a cool ground temp of only 26 degrees C and 3 laps allowed in the time attack, we were clocked at a time of 1 minute 14.62 seconds.

We were placed 3rd place on Onyx's leaderboard, next to a track 350z shared by two drivers:


Now that we've achieved our goals set for Dunnville, we're ready to move onto other tracks with our 1JZ RX-7. We are aiming for Cayuga and Shannonville next, and will eventually participate in events at Mosport, then go competitive in CSCS.

For now, below are some photos from July 25 at Dunnville:

















Howi

nirvash

hi

know the thread is old, but just read it and all i can say is AWESOME!!

i dont have an RX7 yet (looking at getting an FD in the near future) and am also planning like you said a 70% track 30% street orientated car, and have been thinking of what engine i want. (rotary isnt really an option, no one that can work on it around where i live). i think this thread has sold me

i drive a 240sx with a l6 RB25DET nissan skyline engine, and love it, so was only considering an l6, but really wanted a twin turbo setup. first looked at a 2jz but i think for many reasons the 1jz will be better (alot cheaper for 1)

the one thing i was worried about is the weight/handling difference from the rotary to l6, but glad to see the rx7 in true form still handles well

awesome thread, awesome stuff, inspiring

thanks

andreas

p.s sure once everything is on track you will be getting alot of questions from me if you dont mind

13BbackFire

iTrader: (2)

awesome howi! this thread is effin awesome :|!.. i love your fd! you still have to take me around the track with this crazy *** car!

P.s the fc is gona be awesome! for next year watch next year im going to be hitting 1:11:00 ! that is a must! ohh also once i come back, i will be working on a custom exhaust, taking the motor out gona clean it up maybe port it! (large street port) ! and get nice tires with pretty decent rims!!!. its gona be a really decent budget track car!. oh one more thing can you ask kash how much tires would cost. 225/(some what decent profile)/18's if that is possible thanks howi and see you when i get back!