Rx7TyreBurna

iTrader: (1)

Well, I will be putting a megasquirt system into my car, and current have the engine pulled out. I will be pulling the motor apart soon, to see how it looks, but it ran great while it was in the car. very slight coolant loss. So, might be doing a rebuild.

I will be porting the 6 port, or possibly going peripheral port if I can. I was wondering though, is there a IDA type setup that can be used with injectors? Also, I don't mind a high idle, this won't be a street car. Is there a port that is suggested to maximize power?

Motor will probably stay N/A and I'll race with it, until I save to build a nice turbo motor. I'd be happy with anything in the 225 HP - 250 HP.

It's an S4, so I might try and get my hands on some S5, or higher compression rotors....

Thanks!

j9fd3s

iTrader: (3)

IDA style setup with injectors is easy, there are several EFI throttle bodies that fit the IDA pattern, TWM makes one. you could also add injectors in the manifold.

if you're allowed to run unlimited, the P port will make max power, followed by a bridge.

if you have some kind of limit though, either an intake limit, or some really strict noise restrictions, or if you needed a cat or something than best power would be by the port that is least compromised.

the P port will actually idle at a stock Rpm, but have a higher idle because the carb tuning is a compromise, or racers just don't care. mine idles @900-1000 rpm, depending on coolant temp. its a 12A P port, and running thru the stock 12A air cleaner its probably putting down 170-180rwhp, and is under 103DB on a clear day.

with a proper intake, and some tuning i should be around 210-225rwhp, or about 250-260 flywheel.

Rx7TyreBurna

iTrader: (1)

Thanks J9fd3s.

I'm considering P-port, but haven't read too much into it.

I don't really have any restrictions right now. I am going to play with this motor and setup the megasquirt on it. Work on my tuning abilities with the rotary, I regularly tune my WRX w/ romraider and tactrix. I'll probably run another season of novice or time only to get familiar with the new car setup.

I've run the stock RX-7 in sports C class, and the WRX in.... prepared sedan? But, I'm changing a lot on the RX all at the same time.

But, after during the next season, I'll start a high compression motor w/ a smallish turbo. I would like to get more torque. Maybe sit close-ish to 275 whp, but have torque higher then normal. It's one thing I really disliked about racing the RX compared to the WRX. Zero torque. And, I had working 6-ports, with VDI. They were both electronically actuated, and working properly. But, just can't touch the torque of the WRX. Such a small turbo, coming out of a corner, the car would just go. The RX... it sometimes sucked if I came out of a corner at too low of RPM.

Anyways! Thank you again for the great info! I'm going to read more into P-Port. I recently saw a youtube video with a guy that made a custom manifold and I really liked how he had the injectors setup. His was an N/A 20B, but it looked great. 20B.... I wish....

Rx7TyreBurna

iTrader: (1)

I'm a little torn on what to do.
I'd like to prepare an N/A motor for next year, and then the year after, do a turbo.
Should I just go with a large port on my 6-port for now, and then get a turbo keg later?
I'm strongly considering a turbo keg and doing a P-Port N/A, then turbo'ing that later. I do like the idea of a strong N/A.

Can S5 rotors be thrown into any motor? What about RX-8 rotors?

Car will be running megasquirt, if I didn't already mention it.

Rx7TyreBurna

iTrader: (1)

After reading more, it looks like I'll just be aggressively porting the current intake ports. Then, I'll go PP when I pickup the turbo motor.

j9fd3s

iTrader: (3)

you should either go PP or turbo. PP turbo is an advanced combo.

for a turbo setup, you should find a turbo engine, build it with FD bearings and oil pressures, and use turbo rotors and the right size turbo, and enjoy.

high compression turbo is a bad combo, on pump gas you need to turn it so conservatively you are actually down on hp compared to the low compression engine. i have seen a back to back dyno where the only thing that was changed was the rotors and the high compression engine was down something like 50hp.

for an NA setup, the 6 ports suck. the intake ports don't flow that well, and they close so late the power peak comes at a really high rpm which = low power everywhere.

the "best" non PP NA setup would actually also start with turbo irons, as those intake ports close at a place that will give peak power where the ports can actually still flow.

i think going from ported 6 port irons to stock 4 port irons, keeping everything else the same would actually GAIN hp.

Rx7TyreBurna

iTrader: (1)

Hmmm, my hope with the turbo was lower HP, but more TQ.
I have a lot of E85 down here, which I've tuned for on a few STIs. So, I was thinking about doing that. Great to tune with.

But, a PP N/A sounds like a lot of fun. I think I'll just find some T2 Irons and get a good PP N/A. What are the highest compression N/A rotors? I've seen mention of RX-8, but I'm guessing they are pretty pricey.

I'd like to stay with Injectors and my megasquirt and a PP.

Thanks for the input. I've always built for the street, not pure race.

j9fd3s

iTrader: (3)

the PP na IS fun. you want to run the S5 NA rotors. 9.7. the 13B is one of the cases where going higher in compression gets a weirder chamber shape (or something) and you start to loose power.