Chadwick

iTrader: (12)

The 550cc/1300cc combo was running at 95+% duty cycle on that run so you should definitely consider bigger ones. The fuel pump was a Nipondenso from RX7.com.

I would suggest 850cc primaries and 1300cc secondary’s, or if you go to an after market secondary fuel rail you could get away with 550cc/1680cc, which makes it easier to tune idle and low rpm tip in, but harder to tune the transition to secondarys.

GARCO MOTORWORKS

If Chadwick said its so then it is so . He knows his stuff for sure .

Chadwick

iTrader: (12)

Thanks David, coming from you that means a lot !

FDNewbie

iTrader: (10)

Yea I know... NP

Absolutely. That is by far the highest documented figure I have ever seen on ANY set of stock twins (in any form)...and what's even MORE impressive, is that they're sequential. Just WOW. I'm speechless man. My hat's off to ya.

1) How's the spool-up time & response compared to stock?

2) How much does it cost for ya to squeeze that kinda power outta the turbos? And are ya confident you can make that kinda power on any street ported motor? Or do you have to have ported it yourself?

Thanks!
~Ramy

Prometheus

iTrader: (2)

I'm planning on 850/ 1600 for my BNR set-up (I want to run E85, but I'm still researching)

do you think that is enough injector?

karken29

That's more than enough. I'm running 870s/1680s with my 500R, which will make over 500 rwhp easily (given enough boost).

Chadwick, let's see the dyno sheet! I always knew they could make more than 420.

[Edit: Rich posting on his old man's account]

FDNewbie

iTrader: (10)

Rich, he posted it here: https://www.rx7club.com/showpost.php...8&postcount=21

BTW Rich, I emailed ya about somethin I need your help with.

moconnor

iTrader: (14)

The RX-7 fuel calculator gives 530 flywheel hp or ~450whp at 95% injector duty with a 550/1300 combination so the numbers are within the bounds of plausibility.

However, a dyno (ideally with AFRs) is absolutely required!

[Oops - one was just posted. That's a very large drop at transition. What was the boost pattern?]

Chadwick

iTrader: (12)

1) First turbo spools slower and the transition comes in a bit later. I adjusted it back some in later pulls.

2) Don’t think there is any extra cost involved other than the mods listed. I would think that any “good” street ported motor could do about the same. I didn’t do the porting on the motor just the LIM and UIM, as I didn’t build it. I typically only build race engines as I have a very limited amount of time I can spend on other people’s stuff. Kevin at Rotary Resurrection did the short block. I’ll send him a PM and see if he remembers the details on the motor.

Chadwick

iTrader: (12)

That setup would be plenty for gas, not sure about e85 as you will need almost 30% more fuel to get the same results and I'm to lazy to do the calculation.

Chadwick

iTrader: (12)

Rich,
Posted earlier, scroll back in the thread.

Chadwick

iTrader: (12)

It wasn't just posted, I posted right after lunch like I said I would . I hadn't adjusted the transition yet when that pull was made so it was a bit more than normal. No ideal what the boost patern was as I was watching AFR at the time. I can look back at the log when I get a chance.

RX7 RAGE

iTrader: (22)

Was the run on 93 octane or race gas?

Chadwick

iTrader: (12)

93, AFR's were between 10.7 to 11.3

jskyline

simply impressive

t04tii

Why don't you want to go single? Built correctly single turbo systems don't have any more noticeable lag than the stock twins...

Bryan@BNR

iTrader: (1)

GREAT NUMBERS! You have topped them all even running sequential... You have broken the theory that non sequentials make more power.... Way to prove us all wrong and congrads on owning the highest Twin dyno numbers EVER! If you get me one of your curves I may list it on my website and I'll mention your shop.

Bryan@BNR
205 640 1193

Chadwick

iTrader: (12)

Hey Bryan,

Wow, I would have never guessed they were the highest. I find it a bit humorous that we weren't even trying for a record and I honestly feel that there is more there. If you look at the dyno, the boost controller started cycling right at 7k rpm.

Just for the record the log shows a boost pattern of 12.05 lbs peak right before transition, 8.40 lbs at the low point and climbing to 17.35 lbs at peak power on that pull.

I'll send a copy over to you and include a few more of the close pulls for good measure. Do you want it in e-form or a hard copy?

RotaryResurrection

iTrader: (8)

Streetport done was my standard version pictured/discussed at http://www.rotaryresurrection.com/3r..._turbo_sp.html and also pictured at
http://www.rotaryresurrection.com/builds/frascone/ in pics 47-53.

I dont do 3 or 4 versions of streetport like some. I dont have a stage 1 that passes emissions, a stage 2 for autox, a JDM stage 3 for interstate pulls and a super stage 4.5 Type R JDM y0 version for drift. Either you want it ported or not, and if you do, this is what you get.

There are a couple of 450rwhp FC's running my ports on smallish singles and plenty of FD's making 400+ as well. I leave mine a little rougher than some others might. Those not in the know might claim this is laziness, but I think it is actually more beneficial than taking them down to a mirror polish. One way or another, the difference is minute, and clearly my method works out okay.

manveru

wowo...this makes me want to go back to twin seq. props to you, sir

moconnor

iTrader: (14)

12-8-17 is not exactly exploiting the sequential configuration!?

Why is the primary boost not 17 psi also? I have a stock engine and sequential turbos with the usual flow bolt-ons and easily hit 14psi at 2500 rpm, which holds steady until transition at 4000rpm+ and immediately hits 14psi again and holds until redline.

Not flaming - I have a set of M2 ball bearing twins sitting in my garage so the capabilities of a sequential configuration are of more than academic interest to me. A fast spooling single would presumably have just as much low rpm power as a sequential system with a 12-8-17 pattern - with no discontinuity.

Bryan@BNR

iTrader: (1)

445 is one hell of an accomplishment and don't expect too much more than that! To make that set up perfect, smooth out that transition and it will be the ultimate street set up.

As for the dynosheets, I would like to see a few of them. An email to me would be great. BNRsupercars@aol.com.

Also good job on the engine build Resurrection.... BTW I don't polish my ports, they aren't rough either... I think its a waste of time to polish especially when you are forced induction.


Bryan@BNR
205 640 1193

moconnor

iTrader: (14)

Perhaps I'm misreading the graph (or am going colour blind), but I see ~220 whp @ 4.5k rpm.

Bryan@BNR

iTrader: (1)

Sorry I read the sheet wrong. Since my FD is turboless right now, it looks like it will be going back to sequentials when I get some free time!

djseven

iTrader: (56)

I was going to make a comment about another one of those "Budget"Lander's rebuilds but you got to the thread first. Its always hard for me to answer a buyers question when they ask how big the street port is when I sell your short blocks. They always ask if it is a large or standard port, always just say your "standard" port is larger than most other companies standard porting. Now I can point them to this thread and say I know it is capable of 450+.

Awesome numbers out of the turbos, great tuning by Chadwick, and another happy customer with a Landers rebuild