Thanks for the Injection Timing feedback. It helps clear up some of the confusion on the subject.

Injection Firing Angle Can-O-Worms;

https://www.rx7club.com/power-fc-for...angle-1100419/

 

I don't know if I missed it, what surge take setup did you go with? Sounds like it is gonna be a strong runner!

 

Yup, saw that thread, that's actually what caused me to go check to see what mine was set to

It's a radium surge tank. I replaced 2 of the -6AN ports with 5/16" hose barbs which made converting the stock hardlines to AN fittings easy... it's mounted to the studs the stock leading coil was bolted to.

https://www.radiumauto.com/Standard-...anks-P515.aspx

 

Nice. I can see the logo n that picture. They make nice stuff.

 

I'm in the middle of building a turbo manifold, Do you feel that if the turbo was pushed back slightly, you'd have less intake issues? Or is there not enough downpipe room?

 

Yeah, that would solve all my intake issues. This manifold was mainly designed for an fd.

I think the easiest way to do it would just have the runners come straight out and meet in the middle, that should be a good compromise between downpipe and intake room

 

Maybe next year we might cast our FC manifold as we have been selling a lot of them lately.

FC3S Rx7 Short Twinscroll Turbo Manifold

 

I went to go hang out at an autocross school my friend was teaching at to get some seat time in his C6 Z06 I plan on driving for the autox national tour coming up.

I drove a handful of runs in the z06 which wasn't bad, but it was in AS trim (street tires) so it wasn't great , then I jumped in my car on NT01s and no aero.... it's a handful haha. I need better street tires...

cars running great, it's tuned super rich, need to lean it out a bit and change out the spark plugs from stock trailing plugs to R7420 race plugs (didn't run them during break in because I didn't want to foul them... they're expensive)

 

255/40-17 Maxxis RC-1 were great street tires for my EFR 7670 FC.

They don't quite have the cornering grip of warmed up NT01, but omg the acceleration traction was incredible and they had more responsive sidewalls/carcass than the NT01.

I had full traction in 3rd gear @26psi and 2nd gear was easy enough to modulate to keep from spinning.

The RC-1 were so good at straightline traction going to MT ET Street drag radials for the 1/4 mile was like "meh, expected more traction for tires that are trying to kill me."

And the RC-1 are nice and quiet. They are my "dailys" now on the RX-8 now as I tote my BFG R1S to the track.

Mmmn, just saw they have a 24.6" tall 275/35-17 now. That will be great for F/R for the stock body FC guys.

 

most of my problem I think is my suspension is too stiff for normal tires... and I'm used to the car being on hoosiers...

that being said, I think some 315/18 BFG Rival-S on the 18x10.5 RP-F1s I have will be quite a bit better... but those are dollars I'd rather spend elsewhere at the moment...

 

Looks evil! Make some videos when racing.

 

Is 360* the value that worked best for you or did you have better results with something else? The only people I've talked to that have messed with injection timing have said to make small adjustments +/- at a steady idle and try to get the richest AFR for the same PW. Is that what you did?

 

It's the default value in the megasquirt apparently (according to aaroncake's MS3 writeup), I did zero testing... I have no idea why mine was set to something other than the default... I blame muythaibxr

 

autocross school? Is this for SERIOUS autocrossers like you, or is it uselful for people that dream of autocrossing like me?

 

I've been running these on my car for a year on 9.5 inch wheels with Shine front fenders only. I have room for 10.5 inch wheels all around.

It is about time to order another set actually. Mine are starting to fall off.

 

I would agree.. Your car is STIFF.

 

I didn't go to the school, I just went afterwards to use the course that was setup because I know people

They have level 1 and level 2 schools. level 1 is designed for people who have never autorcrossed before or maybe only a few times. You should go to one

Calendar - WDCR SCCA

it doesn't look like they have any more schools scheduled, but they'll probably have a least one more this year.

 

AWESOME, will check their calendar periodically, I could definitely attend the level 1. I haven't autocross in over a decade, and I wasn't any good back then

 

Since I have to miss the next SCCA autocross to go to the Rallycross eastern states championship I took the RX-7 out to a smaller autocross put on my capital driving club (only 150 entries instead of SCCA's usual 250 ) it's a smaller lot, but still decent sized.

The car passed 500 miles on the new engine sometime either on the way there or while it was racing


Got fastest time of the day out of 150 cars, I'll take it. did some experimenting later in the day with the position of the rear wing. I started with it the wing one position down from the top, and then moved it to maxed out in the afternoon. and I have to say, even on the slower lot, it was definitely noticeable, I'll be running with it in the higher position from now on.

I have a 10 psi spring in the waste gate on the new 7670 and it's only hitting 8 psi and then dropping down to 5 psi... so the car is noticeably down on power. probably need to add some preload to the wastegate, but i definitely need to add a boost control solenoid...

 

You still looked impressively fast, regardless of the power level.

Based on pressure ratio and the compressor flow, that should put you around 260 rwhp, correct?

 

Looks good!

Might only be 8 down to 5psi, but the response looks impressive. The torque response looks NA like, like you can steer the car around with throttle easily.

How would you rate the turbo response compared to the last smaller stock hybrid set-up you had?

 

haha, you're guess is as good as mine

I have to say, I'm a little bit disappointed so far, it's not as night and day different from the BNR2 as I thought it would be. it should get better with some smart EBC tuning though, I think holding the wastegate door closed until boost is reached is going to change the characteristics a lot. just driving around the parking lot I can hear the turbo trying to spool which definitely didn't happen on the old turbo

 

Lately I've been trying to track down a fairly substantial rear transmission leak. when I had the driveshaft out I replaced the driveshaft pinion seal. so I don't think it's that. I took the shifter apart about a week ago and re-sealed both the side plate thing and the short shifter base area (along with replacing the oil up there which was pretty nasty).

peaked under the car today.... still have a nice puddle. the only other thing I can think of is it's the little plate with 2 bolts that I think holds the shifter detent ball and spring in. it's the last thing back there that could be leaking... if not I'll have to get more extreme in looking for leak sources...

 

Two dumb questions.

Is the fluid level too high?

Is there too much case pressure from a clogged breather?

 

1 - no, contrary to what the Haynes manual tells you, both top bolts are not fill holes, its only filled to the bottom top hole

2 - not sure, not even sure where the breather is... Will investigate.