I agree with you to a certain extent. The street car agument is null. A RX-7 is a race car that was made to be streetable. The problem is how streetable will it be before it's too much of a pain in the *** to drive in the street after you have modified the drivetrain exhaust and suspension.

If you are looking to run 20 psi /400+HP on a rotary I doubt it's not to race

 

Hey at least were agreeing on something... Now what i trying to say is that for the majority of people on this board big primaries are not the way to go...

As far as how streetable it will be before it becomes a pain in the *** depends on the owner.. But for me, as long as the cops don't bust my chops you better believe that im driving my car on the street regardless.

 

I guess everyone has a different opinion on everything. I know that im going to have to have 1600's as secondaries, thats a given, what I want to know now, is what boost im i going to have to run to get my 450 to 480 HP number, at high boost.Low boost doesnt realy matter that much anyway it will either be 17 or 18#. Ive been running 15#'s for almost 5 months now and i need more horsepower.

 

If your car is tuned well then you should be in the 450 RWHP area with 17-18 PSI.

 

I think some of you guys need to address your fuel supply setup!
If you have to run 1600cc X 4 just to support 500RWHP and under at 75% duty cycle then you're starving for fuel!
On all of the cars I've done I can do the same with a 720/1600 combo running at an 11.0 to 11.5 A/F ratio,40 to 42 psi base fuel pressure!

crispeed

 

Chris, I agree with the above. 4x1600cc's aren't for every one. If youre looking for 500HP you can go the 720/1600 route.

If you're looking for the big numbers like A.i, S...t, and c......d without running out of duty cycle the 720/1600 may not be for you.

If you have a bridgeport running 30 psi shifting towards the 9,000 rpm range with a t88 like R1DREAD, the 4x1600cc injectors will be able to support your fuel needs and still gives you room to run extra rich.

Hey don't bother counting the dots

 

I think what Crispeed is trying to say and what i have also been trying to say is that if you need 4 1600cc injectors to support 500hp you have supply problems... Upgrade to -10 fuel line and get a good external pump...

 

Who said you need 4 x1600 cc injectors to supply 500hp? Besides you don't need -10 fuel lines to support 500hp either. So you are wrong in both cases.

 

Well it was stated before that someone was running 75% duty cycle with their 4 1600's... Yes your right you don't need -10 lines to support 500hp but you SHOULD NOT be using your stock lines that's for sure. You would be fine with a -8 but might as well do it right and get yourself -10...

Stop agrueing about fuel systems, Especially in high horsepower turbo cars... You want it done right you have to get bigger fuel lines, a good external pump that flows enough fuel at the psi its going to be used at, filter, regulater, etc...

 

Yeh, youre right build everything to support 1000HP and use little injectors.

Don't you see what I'm saying. you don't have to use -10 just as much as you don't have to use 1600cc injectors.

 

I have 4 1600s on a TutboII with a supercharger(NOVI2000).
I have -10 lines.
At 26PSI of boost , 8100 rpm, Fuel PSI 70PSI(initial set 44PSI),
BIG port(No BP), ? A/F ratio, I am getting 80% duty cycle.
Horsepower - Unknown.....
I bought theses injectors because I know I plan to run Big Horse power.
I plan to run MAx rpm at 8600 rpm...

Not sure how You bridgeport guys are not running Big Injectors unless you are not running big RPMs or you are Using nitrous wet systems to help...

 

My mistake.
My duty cycle was 89% 8100 rpm.

 

I don't know about those other guys but my car has over 550 whp,2900lbs went 133
do you think that i bought a T88 to be satisfied with 550? I'm off by 150 hp. you could be right about the fuel system thats why i,m going Motec so that i can datalog it. Supras make 870whp on the same setup i have. Twin Supra pumps paxton reg -8 lines .
In my case i think its a tuning issue Haltech is two hard i guess cause it only 2D,my Ms are probably to high at high rpm . i think most guys with high hp have a dist and all they ajust is fuel kinda easier.
Abel has 8 1600s with alcohol i would think that you would need half that for Gas.
Barry

 

Try this one waynespeed... My cousin's car is a Honda with a 1.8L turbo(T04) and all the other goodies(DFI ecu)... His fuel system consists of -10 line(supply) -8 return, aeromotive pump, filter & reg, And 4 550cc injectors. At 28psi this car made 510hp at the wheels. The injectors were just about maxed out... He's going to get new injectors and a bigger turbo this winter But the point im trying to make here is that he made over 500hp with 550cc injectors. I just don't see why some people are using 4 1600cc for the same HP levels.

 

Actually you figured it out yourself, sure you can make the power, but the main point is YOU ARE MAXED OUT.

 

Plus the fuel needs for a piston the rotary are different , if it wasn't the stock fuel system would be good for over 500 easy,2 550s and 2 850s Duh....
Barry

 

Damn !!!
I can't believe some of you are comparing rotaries and piston engines as far as fuel requirements !!!!
Rotaries will need more fuel to make the same hp as a piston motors by design !!!! -Obviously same goes for air flow...

4x1600cc/-10an lines is obviously for those serious guys looking for the max output in a race setup.

Mid_KnightFD: for ~450-480WH you could drop 2x1600cc for sec's and drop the 850cc for primaries and 17-20psi of boost depending on turbo setup.....and still drive it everyday


I just recently replaced my multi-injector set up ( 2x680cc, 6x550cc which put down a bit over 500RWH w/inj's maxing out )with 2x1200cc and 2x1600cc.
Engine feels smoother and turbo lag his less....next Sat it will go on the dyno to be tuned

John D.
10th Ann Ed T-II
10.80 @ 130mph
11.1 @ 131 mph

 

Boostn7 thanks for finally answering my question i guess will see in january or febuary the final result I'll be happy with 450-480 as long as i get that, then down the road i may want more

 

Do people really think that a -8 line would be too restrictive for a gas situation?? Seems a little over kill to go any larger than a 8 to me.

How many #'s / hr of fuel do you need to make... lets say 600hp on a rotary?

 

-8 is not overkill....

I was not trying to compare piston engines to rotary's.. Simply trying to show that when the fuel system is good you will be surprised by how much injector you really need. I was surprised we were able to get that much HP from 550's.

Now go upgrade your fuel lines(-10), pump, etc... and see if you can max out 850/1600... GOOD LUCK...

 

Everyone that are running with 4X1600's what are you using for a fuel pump,fuel line and regulator?

crispeed
87TII
9.20@150mph 1/4
5.91@118mph 1/8
1.32 60ft
2600lbs

 

Peter (rice racing) is able to churn out 590Hp with what is essentially only a tad more than a pair of 1600's - he is running 4 x 880's

you guys who are needing 4 x 1600's have some SERIOUS fuel supply issues somewhere which i suggest you address.

 

4 880s for additional injectors ?
I don't believe that .590 whp on just 4 880s,
what kind of reg and what is static fuel pressure 100psi?
Can you guys post your Ms at your highest rpm.
barry

 

I have a Paxton blue pump with a paxton regulator.
I think this pump is at its limit @70PSI of fuel, but it has not droped off.

I think you have the big street Weldon pump.
How is it?

 

I can only speak for myself and my experiences, not for everyone using 4x1600cc injector setup.

Dual external big Bosch pumps 1028 (50gal/hr@70psi each)
Paxton regulator.
Dual -6 fuel lines.
Maximum milliseconds at 30 psi is below 6ms. allowing the motor to rev up to 10,000 rpms with no duty cycle issues at all.

It seems some of you guys are taking this(4x1600cc) topic too personal.

YOU DO NOT NEED 4X1600CC INJECTORS TO MAKE 500HP
4X1600 SHOULD BE ABLE TO SUPPORT UP TO 1000HP

I've tried it, tuned it and liked it because works for me.

If you haven't tried it, don't knock it. If 4 550cc injectors works for you with -10 lines, great!!

For the guys running 720/1600 please list your max RPM, BOOST and INJ ms. I'm always willing to learn.