Just curious if 230 to the wheels while staying n/a and without nitrous is concievable.The car is an '89GTUs. Right now I'm just curious as I'm still acouple of years away from having the funds, but am trying to decide what I want to do.Stay n/a, go turbo,sell,etc. Anyway I'm sure Ill have to go to a standalone and It'll take more than stock ports. I have some TII injectors(not in the car though).Will a large streetport be enough or would a half-bridge work. I don't think I want a full bridge as it will remain a street car. I can live with a slightly bumpy idle say between 1k to 1.5k RPM. I don't want a car that idles at 2.5k or more. Plan to get a lightweight flywheel also. Is a standalone,large streetport, and proper tuning enough to get 220 to 230 to the wheels. Also I have a truck I sometimes drive so this car won't be my only mode of transportation. Thanks

 

TII housings with a large streetport, standalone, well designed exhaust, and a good intake manifold setup will get you close if not there.

 

pass it to me when you're done. 230 at the wheels? on an NA motor??? dude, thats more than a stock TURBO FC....IF you had a monster bridge port, a standalone, really good flowing exhaust, MAYBE 230 at the crank.

 

You almost have to go bridge unless we're talking expensive custom intake manifold.


-Ted

 

Yes that would be the goal. More than Stock or mildly modified TII but all motor. I thought I saw some dyno sheets on here once of a car on stock ports that was making around 180rwhp. I thought maybe a large streetport or half-bridge might get a person over 200rwhp.Would it be correct to say it is possible but the ability to be driven on a daily basis if one so chooses would be gone?

 

I think it's doable. You just got to get creative.

 

and expensive its either cheap or fast but not both.

 

Cheap and fast is also possible. It all depends on how creative you get.

 

yep. doable, it would be reliable enough to daily, but dunno if youd want to

 

Probably be driven between 2 to 4 days a week. Sounds like I might be better off to go turbo instead.

 

yep ... for that goal, you probably are.

 

Sure it's possible, depending on your definition of streetable. To break in our E-Prod motor we threw it in my street car and I bombed around back roads... I know that puts out 235 at the crank, and it's just a streetported (okay, large streetport) 12A. Personally, I found it perfectly acceptable, and am intending to use the port templates when I get around to building up a 13B for street duty.

'course, again, what people are willing to put up with from a daily driver varies.

 

we had a RS car put down 206 to the wheels that was still rich up top, had tII irons w/ mild streetport, raceport exhausts, s5 tII intake, SDS for the fuel, 2 MSD 7AL's. my boss thought it would put around 220 once it was fully dialed in... Depending on the person, it could be streetable..

 

making that power at the flywheel is not a problem ... it's been done several times over. however, the thread title is specifying power to the wheels and for that, i'm a bit skeptical.

 

Well, that number's out of a Prod legal 12A remember... prod specifies a maximum venturi size for the carb, which restricts airflow. So with a 13B and no restriction, 235 at the wheels doesn't seem unreasonable. 'course, it'd mean fabricating an intake manifold, but oh well.

 

a guy with a half bridge 12a NA here in miami got him 247 @ the wheels

 

Owned.

 

6 port bridgeport full exhaust on a holley landed 230rwhp for a customer of mine.. no split on timing and some plenum work on the manifold and a few more mods..

 

Hate to throw everyone under the bus here, but its easily possible.

A medium streetported renesis would get him there without a problem.

 

I've ported a Renesis. You can't do much on that engine in terms of porting and nothing you do seems to gain anything anyways. Stock that motor is capable of 230 rwhp but that's if everything is done properly and tuned VERY well.

My personal opinion is that while having a 230 rwhp naturally aspirated street car can be done, it should basically be considered out of reach for most as most people are still climbing the walls trying to figure out how to get 200 rwhp. It all comes down to what you want to do. Do you just want 230 rwhp or do you have to have it on an n/a? Keep in mind the person who did reach 230 rwhp on a street car used a 4 port engine from a Japanese Cosmo, along with it's intake manifold which he cut 2" out of, a standalone ecu, and a host of other custom bits. It's not just as easy as doing a little porting. It's also not going to be cheap. It's possible though.

If you intend to keep a 6 port engine in the car, you're limited to a streetport. Bridges on those motors always turn out like crap and never work like people think they should. It's a dead end road to try. Especially if you are keeping the factory intake manifold! 200 rwhp isn't out of the realm of possibility though. If you want to follow the n/a road to 230 rwhp, just understand that you are looking at alot of work and money. As long as you are fine with that, damn near anything is possible.

 

not to back-pedal simply because it's been done now, but i agree. it's possible, but not an easy road by any stretch. GtoRx7 is not the "average" Rx-7 owner/enthusiast and though his accomplishment is GREAT for him (and streetable N/A Rx-7s all over) and will likely be good for his business, it's probably setting up a lot of people for a broken heart.

 

haha that's so true. That man has gone through so many iterations of that car, sometimes gaining power and sometimes losing power (which he doesn't necessarily go bragging about!). It's a constant experiment for him, but he really knows what he's doing, he has the tools, the skills, and the time. He has a lot of little tricks up his sleeve that took a lot of effort, money, and time to learn. It was a serious accomplishment, and not too many people are going to be able to match it.

 

I've talked to my tuner about this in the past before deciding to go turbo. It can be done but noise and idle will become the issue if you decide to port. I make 147 to the wheels with two rotors on minimum compression.... last owner babied motor so I have to drive fast to break carbon off.
Average power for stock 6 ports with exhaust,intake and A/F tune is between 175-195 at the wheels. With a mild port I would think it's possible...money is the other factor.
you can spend alot trying to go standalone or simply do a digital tuning chip.I would have, but found out too late.


89 gxl na-- waiting for t2
afc neo, PR 6port inserts,RB header w/ pre silencer,Apex n1 evo exh,460cc primaries,550cc secondaries,SRmotorsports pullies,apexi intake

 

stock 6 ports average out at 175 whp with exhaust, intake and standalone? I haven't seen that.

If anything, they average at 160 whp.

 

I think the highest ITS dyno I've seen was 173whp, but IIRC that was with a stock computer. With a standalone you should be able to get a little more than that, but 190+whp on a stock port engine likely isn't going to happen without ITB's or something along those lines.